release v0.22.6

If the constructor moves from an ExportedSong instance which refers to
somebody else's "Tag" instance, the newly constructed instance will
instead refer to its own empty "tag_buffer" field.  This broke
SimpleDatabase::GetSong(), i.e. all songs on the queue restored from
the state file or added using the "addid" command.

Closes https://github.com/MusicPlayerDaemon/MPD/issues/1089

.clang-format

@@ -0,0 +1,17 @@
+BasedOnStyle: LLVM
+AccessModifierOffset: -8
+AllowAllConstructorInitializersOnNextLine: false
+AlwaysBreakTemplateDeclarations: Yes
+BraceWrapping:
+  AfterFunction: true
+  SplitEmptyFunction: true
+BreakConstructorInitializers: BeforeColon
+ColumnLimit: 90
+ConstructorInitializerIndentWidth: 0
+ContinuationIndentWidth: 8
+IndentCaseLabels: false
+IndentPPDirectives: AfterHash
+IndentWidth: 8
+Standard: c++17
+TabWidth: 8
+UseTab: Always

.github/FUNDING.yml

@@ -0,0 +1,12 @@
+# These are supported funding model platforms
+
+github: # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
+patreon: # Replace with a single Patreon username
+open_collective: # Replace with a single Open Collective username
+ko_fi: # Replace with a single Ko-fi username
+tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
+community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
+liberapay: MaxK
+issuehunt: # Replace with a single IssueHunt username
+otechie: # Replace with a single Otechie username
+custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,22 @@
+---
+name: Bug report
+about: Create a bug report
+---
+
+<!-- See https://www.musicpd.org/help/ -->
+## Bug report
+### Describe the bug
+
+
+## Expected Behavior
+
+
+## Actual Behavior
+
+
+## Version
+<!-- Paste the output of "mpd --version" here -->
+
+
+## Log
+<!-- Paste relevant portions of the log file here (--verbose) -->

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,6 @@
+---
+name: Feature request
+about: Create a feature request
+---
+
+## Feature request

.github/ISSUE_TEMPLATE/question.md

@@ -0,0 +1,9 @@
+---
+name: Question
+about: Ask a question about MPD
+---
+
+<!-- Before you ask a question on GitHub, please read MPD's
+documentation.  A copy is available at
+https://www.musicpd.org/doc/html/ -->
+## Question

.gitignore

@@ -1,88 +1,11 @@
-*.Plo
-*.Po
-*.a
-*.d
-*.la
-*.lo
-*.o
-*.exe
-
 *~
 
 .#*
 .stgit*
-.deps
-.dirstamp
 
-tags
-
-/Makefile
-/Makefile.in
-/aclocal.m4
-/autom4te.cache
-/config.h
-/config.h.in
-/config.log
-/config.mk
-/config.status
-/config_detected.h
-/config_detected.mk
-/configure
-/configure.lineno
-/depmode
-/libtool
-/ltmain.sh
-/mkinstalldirs
-/build
-/src/mpd
-/systemd/system/mpd.service
-/systemd/user/mpd.service
-/stamp-h1
-
-/src/dsd2pcm/dsd2pcm
-/src/win32/mpd_win32_rc.rc
-
-/doc/doxygen.conf
-/doc/protocol.html
-/doc/protocol
-/doc/user
-/doc/developer
-/doc/sticker
-/doc/api
-
-/test/software_volume
-/test/run_convert
-/test/run_decoder
-/test/read_tags
-/test/run_filter
-/test/run_encoder
-/test/run_output
-/test/read_conf
-/test/run_input
-/test/read_mixer
-/test/dump_playlist
-/test/run_normalize
-/test/tmp
-/test/run_inotify
-/test/test_queue_priority
-/test/test_protocol
-/test/run_ntp_server
-/test/run_resolver
-/test/run_tcp_connect
-/test/test_pcm
-/test/dump_rva2
-/test/dump_text_file
-/test/test_util
-/test/test_byte_reverse
-/test/test_mixramp
-/test/test_vorbis_encoder
-/test/DumpDatabase
-
-/lib/
-
-/*.tar.gz
-/*.tar.bz2
-/*.tar.xz
-/mpd-*/
+/output/
 
 __pycache__/
+
+/.clangd/
+/compile_commands.json

.travis.yml

@@ -1,36 +1,153 @@
-dist: trusty
 language: cpp
 
-addons:
-  apt:
-    packages:
-      - libcppunit-dev
-      - libboost-dev
+jobs:
+  include:
+    # Ubuntu Bionic (18.04) with GCC 7
+    - os: linux
+      dist: bionic
+      addons:
+        apt:
+          sources:
+            - sourceline: 'ppa:deadsnakes/ppa' # for Python 3.7 (required by Meson)
+          packages:
+            - libgtest-dev
+            - libboost-dev
+            - python3.6
+            - python3-urllib3
+            - ninja-build
+      before_install:
+        - wget https://bootstrap.pypa.io/get-pip.py
+        - /usr/bin/python3.6 get-pip.py --user --no-cache-dir
+      install:
+        - /usr/bin/python3.6 $HOME/.local/bin/pip install --user meson --no-cache-dir
+      env:
+        - MATRIX_EVAL="export PATH=\$HOME/.local/bin:\$PATH"
 
-os:
-  - linux
-  - osx
+    # Ubuntu Bionic (18.04) with GCC 7 on big-endian
+    - os: linux
+      arch: s390x
+      dist: bionic
+      addons:
+        apt:
+          sources:
+            - sourceline: 'ppa:deadsnakes/ppa' # for Python 3.7 (required by Meson)
+          packages:
+            - libgtest-dev
+            - libboost-dev
+            - python3.6
+            - python3-urllib3
+            - ninja-build
+      before_install:
+        - wget https://bootstrap.pypa.io/get-pip.py
+        - /usr/bin/python3.6 get-pip.py --user --no-cache-dir
+      install:
+        - /usr/bin/python3.6 $HOME/.local/bin/pip install --user meson --no-cache-dir
+      env:
+        - MATRIX_EVAL="export PATH=\$HOME/.local/bin:\$PATH"
 
-env:
-  global:
-    - MAKEFLAGS="-j2"
+    # Ubuntu Bionic (18.04) with GCC 7 on ARM64
+    - os: linux
+      arch: arm64
+      dist: bionic
+      addons:
+        apt:
+          sources:
+            - sourceline: 'ppa:deadsnakes/ppa' # for Python 3.7 (required by Meson)
+          packages:
+            - libgtest-dev
+            - libboost-dev
+            - python3.6
+            - python3-urllib3
+            - ninja-build
+      before_install:
+        - wget https://bootstrap.pypa.io/get-pip.py
+        - /usr/bin/python3.6 get-pip.py --user --no-cache-dir
+      install:
+        - /usr/bin/python3.6 $HOME/.local/bin/pip install --user meson --no-cache-dir
+      env:
+        - MATRIX_EVAL="export PATH=\$HOME/.local/bin:\$PATH"
+
+    # Ubuntu Trusty (16.04) with GCC 8
+    - os: linux
+      dist: trusty
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+            - sourceline: 'ppa:mhier/libboost-latest'
+            - sourceline: 'ppa:mstipicevic/ninja-build-1-7-2'
+            - sourceline: 'ppa:deadsnakes/ppa' # for Python 3.7 (required by Meson)
+          packages:
+            - g++-8
+            - libgtest-dev
+            - boost1.67
+            - python3.6
+            - python3-urllib3
+            - ninja-build
+      before_install:
+        - wget https://bootstrap.pypa.io/get-pip.py
+        - /usr/bin/python3.6 get-pip.py --user --no-cache-dir
+      install:
+        - /usr/bin/python3.6 $HOME/.local/bin/pip install --user meson --no-cache-dir
+      env:
+        # use gold as workaround for https://sourceware.org/bugzilla/show_bug.cgi?id=17068
+        - MATRIX_EVAL="export CC='ccache gcc-8' CXX='ccache g++-8' LDFLAGS=-fuse-ld=gold PATH=\$HOME/.local/bin:\$PATH"
+
+    - os: osx
+      osx_image: xcode10.3
+      addons:
+        homebrew:
+          packages:
+            - ccache
+            - meson
+            - icu4c
+            - ffmpeg
+            - libnfs
+            - yajl
+            - libupnp
+            - libid3tag
+            - chromaprint
+            - libsamplerate
+            - libsoxr
+            # libzzip appears to be broken on Homebrew: "ld: library not found for -lzzip"
+            #- libzzip
+            - flac
+            - opus
+            - libvorbis
+            - faad2
+            - wavpack
+            - libmpdclient
+          update: true
+      env:
+        - MATRIX_EVAL="export PATH=/usr/local/opt/ccache/libexec:$PATH HOMEBREW_NO_ANALYTICS=1"
+
+cache:
+  apt: true
+  ccache: true
+  directories:
+    - $HOME/Library/Caches/Homebrew
+
+before_cache:
+  - test "$TRAVIS_OS_NAME" != "osx" || brew cleanup
 
 before_install:
-  # C++14
-  - test "$TRAVIS_OS_NAME" != "linux" || sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
-  - test "$TRAVIS_OS_NAME" != "linux" || sudo apt-get update -qq
-  - test "$TRAVIS_OS_NAME" != "osx" || brew update
+  - eval "${MATRIX_EVAL}"
 
 install:
   # C++14
-  - test "$TRAVIS_OS_NAME" != "linux" || sudo apt-get install -qq g++-5
-  - test "$TRAVIS_OS_NAME" != "osx" || brew install cppunit
+
+  # Work around "Target /usr/local/lib/libgtest.a is a symlink
+  # belonging to nss. You can unlink it" during gtest install
+  - test "$TRAVIS_OS_NAME" != "osx" || brew unlink nss
+
+  - test "$TRAVIS_OS_NAME" != "osx" || brew install https://gist.githubusercontent.com/Kronuz/96ac10fbd8472eb1e7566d740c4034f8/raw/gtest.rb
+
+before_script:
+  - ccache -s
 
 script:
-  - OPTIONS="--enable-test"
-  - test "$TRAVIS_OS_NAME" != "linux" || export CC=gcc-5 CXX=g++-5
-  - test "$TRAVIS_OS_NAME" != "osx" || OPTIONS="$OPTIONS --enable-osx"
-  - ./autogen.sh
-  - ./configure --disable-silent-rules --disable-dependency-tracking $OPTIONS
-  - make
-  - make check
+  - eval "${MATRIX_EVAL}"
+  - OPTIONS="-Dtest=true"
+  - meson . output --werror $OPTIONS
+  - ninja -C output -v test
+  - ccache -s

AUTHORS

@@ -1,5 +1,5 @@
 Music Player Daemon - http://www.musicpd.org
-Copyright 2003-2017 The Music Player Daemon Project
+Copyright 2003-2021 The Music Player Daemon Project
 
 The following people have contributed code to MPD:
 
@@ -31,3 +31,19 @@ The following people have contributed code to MPD:
  Jean-Francois Dockes <jf@dockes.org>
  Yue Wang <yuleopen@gmail.com>
  Matthew Leon Grinshpun <ml@matthewleon.com>
+ Dimitris Papastamos <sin@2f30.org>
+ Florian Schlichting <fsfs@debian.org>
+ François Revol <revol@free.fr>
+ Jacob Vosmaer <contact@jacobvosmaer.nl>
+ Thomas Guillem <thomas@gllm.fr>
+ Andrew Basterfield <abasterfield@gmail.com>
+ Bart Nagel <bart@tremby.net>
+ Christian Kröner <ckroener@gmx.net>
+ Christopher Zimmermann <madroach@gmerlin.de>
+ John Regan <john@jrjrtech.com>
+ Joshua Wise <joshua@joshuawise.com>
+ Ryan Walklin
+ Stefan Roellin <stefan@roellin-baumann.ch>
+ Stefano Miccoli <stefano.miccoli@polimi.it>
+ Steven O'Brien <steven_obrien1@yahoo.co.uk>
+ Thomas Zander <thomas.e.zander@googlemail.com>

NEWS

@@ -1,3 +1,570 @@
+ver 0.22.6 (2021/02/16)
+* fix missing tags on songs in queue
+
+ver 0.22.5 (2021/02/15)
+* protocol
+  - error for malformed ranges instead of ignoring silently
+  - better error message for open-ended range with "move"
+* database
+  - simple: fix missing CUE sheet metadata in "addid" command
+* tags
+  - id: translate TPE3 to Conductor, not Performer
+* archive
+  - iso9660: another fix for unaligned reads
+* output
+  - httpd: error handling on Windows improved
+  - pulse: fix deadlock with "always_on"
+* Windows:
+  - enable https:// support (via Schannel)
+* Android
+  - work around "Permission denied" on mpd.conf
+
+ver 0.22.4 (2021/01/21)
+* protocol
+  - add command "binarylimit" to allow larger chunk sizes
+  - fix "readpicture" on 32 bit machines
+  - show duration and tags of songs in virtual playlist (CUE) folders
+* storage
+  - curl: fix several WebDAV protocol bugs
+* decoder
+  - dsdiff: apply padding to odd-sized chunks
+* filter
+  - ffmpeg: detect the output sample format
+* output
+  - moveoutput: fix always_on and tag lost on move
+* Android
+  - enable https:// support (via OpenSSL)
+
+ver 0.22.3 (2020/11/06)
+* playlist
+  - add option "as_directory", making CUE file expansion optional
+* storage
+  - curl: fix crash bug
+* filter
+  - fix garbage after "Audio format not supported by filter" message
+  - ffmpeg: support planar output
+  - ffmpeg: support sample formats other than 16 bit
+
+ver 0.22.2 (2020/10/28)
+* database
+  - simple: purge songs and virtual directories for unavailable plugins
+    on update
+* input
+  - qobuz/tidal: fix protocol errors due to newlines in error messages
+  - smbclient: disable by default due to libsmbclient crash bug
+* playlist
+  - soundcloud: fix protocol errors due to newlines in error messages
+* state_file: save on shutdown
+
+ver 0.22.1 (2020/10/17)
+* decoder
+  - opus: apply the OpusHead output gain even if there is no EBU R128 tag
+  - opus: fix track/album ReplayGain fallback
+* output
+  - alsa: don't deadlock when the ALSA driver is buggy
+  - jack, pulse: reduce the delay when stopping or pausing playback
+* playlist
+  - cue: fix two crash bugs
+* state_file: fix the state_file_interval setting
+
+ver 0.22 (2020/09/23)
+* protocol
+  - "findadd"/"searchadd"/"searchaddpl" support the "sort" and
+    "window" parameters
+  - add command "readpicture" to download embedded pictures
+  - command "moveoutput" moves an output between partitions
+  - command "delpartition" deletes a partition
+  - show partition name in "status" response
+* tags
+  - new tags "Grouping" (for ID3 "TIT1"), "Work" and "Conductor"
+* input
+  - curl: support "charset" parameter in URI fragment
+  - ffmpeg: allow partial reads
+  - io_uring: new plugin for local files on Linux (using liburing)
+  - smbclient: close unused SMB/CIFS connections
+* database
+  - upnp: drop support for libupnp versions older than 1.8
+* playlist
+  - cue: integrate contents in database
+* decoder
+  - ffmpeg: support RTSP
+  - mad: remove option "gapless", always do gapless
+  - sidplay: add option "default_genre"
+  - sidplay: map SID name field to "Album" tag
+  - sidplay: add support for new song length format with libsidplayfp 2.0
+  - vorbis, opus: improve seeking accuracy
+* playlist
+  - flac: support reading CUE sheets from remote FLAC files
+* filter
+  - ffmpeg: new plugin based on FFmpeg's libavfilter library
+  - hdcd: new plugin based on FFmpeg's "af_hdcd" for HDCD playback
+  - volume: convert S16 to S24 to preserve quality and reduce dithering noise
+  - dsd: add integer-only DSD to PCM converter
+* output
+  - jack: add option "auto_destination_ports"
+  - jack: report error details
+  - pulse: add option "media_role"
+  - solaris: support S8 and S32
+* lower the real-time priority from 50 to 40
+* switch to C++17
+  - GCC 8 or clang 5 (or newer) recommended
+
+ver 0.21.26 (2020/09/21)
+* database
+  - inotify: obey ".mpdignore" files
+* output
+  - osx: fix crash bug
+  - sles: support floating point samples
+* archive
+  - bzip2: fix crash on corrupt bzip2 file
+  - bzip2: flush output at end of input file
+  - iso9660: fix unaligned reads
+  - iso9660: support seeking
+  - zzip: fix crash on corrupt ZIP file
+* decoder
+  - ffmpeg: remove "rtsp://" from the list of supported protocols
+  - ffmpeg: add "hls+http://" to the list of supported protocols
+  - opus: support the gain value from the Opus header
+  - sndfile: fix lost samples at end of file
+* fix "single" mode bug after resuming playback
+* the default log_level is "default", not "info"
+
+ver 0.21.25 (2020/07/06)
+* protocol:
+  - fix crash when using "rangeid" while playing
+* database
+  - simple: automatically scan new mounts
+  - upnp: fix compatibility with Plex DLNA
+* storage
+  - fix disappearing mounts after mounting twice
+  - udisks: fix reading ".mpdignore"
+* input
+  - file: detect premature end of file
+  - smbclient: don't send credentials to MPD clients
+* decoder
+  - opus: apply pre-skip and end trimming
+  - opus: fix memory leak
+  - opus: fix crash bug
+  - vorbis: fix crash bug
+* output
+  - osx: improve sample rate selection
+  - osx: fix noise while stopping
+* neighbor
+  - upnp: fix crash during shutdown
+* Windows/Android:
+  - fix Boost detection after breaking change in Meson 0.54
+
+ver 0.21.24 (2020/06/10)
+* protocol
+  - "tagtypes" requires no permissions
+* database
+  - simple: fix crash when mounting twice
+* decoder
+  - modplug: fix Windows build failure
+  - wildmidi: attempt to detect WildMidi using pkg-config
+  - wildmidi: fix Windows build failure
+* player
+  - don't restart current song if seeking beyond end
+* Android
+  - enable the decoder plugins GME, ModPlug and WildMidi
+  - fix build failure with Android NDK r21
+* Windows
+  - fix stream playback
+  - enable the decoder plugins GME, ModPlug and WildMidi
+  - work around Meson bug breaking the Windows build with GCC 10
+* fix unit test failure
+
+ver 0.21.23 (2020/04/23)
+* protocol
+  - add tag fallback for AlbumSort
+* storage
+  - curl: fix corrupt "href" values in the presence of XML entities
+  - curl: unescape "href" values
+* input
+  - nfs: fix crash bug
+  - nfs: fix freeze bug on reconnect
+* decoder
+  - gme: adapt to API change in the upcoming version 0.7.0
+* output
+  - alsa: implement channel mapping for 5.0 and 7.0
+* player
+  - drain outputs at end of song in "single" mode
+* Windows
+  - fix case insensitive search
+
+ver 0.21.22 (2020/04/02)
+* database
+  - simple: optimize startup
+* input
+  - curl: fix streaming errors on Android
+* playlist
+  - rss: support MIME type application/xml
+* mixer
+  - android: new mixer plugin for "sles" output
+* Android
+  - TV support
+* Windows
+  - fix time zone offset check
+* fix build failures with uClibc-ng
+
+ver 0.21.21 (2020/03/19)
+* configuration
+  - fix bug in "metadata_to_use" setting
+* playlist
+  - asx, xspf: fix corrupt tags in the presence of XML entities
+* archive
+  - iso9660: skip empty file names to work around libcdio bug
+* decoder
+  - gme: ignore empty tags
+* output
+  - solaris: port to NetBSD
+* raise default "max_connections" value to 100
+
+ver 0.21.20 (2020/02/16)
+* decoder
+  - audiofile, ffmpeg, sndfile: handle MIME type "audio/wav"
+  - ffmpeg: fix playback of AIFF and TTA
+  - vorbis, opus: fix seeking in small files
+* fix backwards seeking on ARM (and other non-x86 CPUs)
+
+ver 0.21.19 (2020/01/17)
+* configuration
+  - allow overriding top-level settings in includes
+* output
+  - pulse: obey Pulse's maximum sample rate (fixes DSD128 playback)
+* fix build failure with clang 10
+* fix build failure with Android NDK r20
+
+ver 0.21.18 (2019/12/24)
+* protocol
+  - work around Mac OS X bug in the ISO 8601 parser
+* output
+  - alsa: fix hang bug with ALSA "null" outputs
+* storage
+  - curl: fix crash bug
+* drop support for CURL versions older than 7.32.0
+* reduce unnecessary CPU wakeups
+
+ver 0.21.17 (2019/12/16)
+* protocol
+  - relax the ISO 8601 parser: allow omitting field separators, the
+    time of day and the "Z" suffix
+* archive
+  - zzip: improve error reporting
+* outputs
+  - jack: mark ports as terminal
+  - shout: declare metadata as UTF-8
+* fix build failure with -Ddatabase=false
+
+ver 0.21.16 (2019/10/16)
+* queue
+  - fix relative destination offset when moving a range
+* storage
+  - curl: request the "resourcetype" property to fix database update
+  - curl: URL-encode more paths
+  - curl: follow redirects for collections without trailing slash
+* update
+  - fix crash when music_directory is not a directory
+* fix build with iconv() instead of ICU
+
+ver 0.21.15 (2019/09/25)
+* decoder
+  - dsdiff, dsf: fix displayed bit rate
+  - mpcdec: fix bogus ReplayGain values
+* output
+  - solaris: fix build with glibc 2.30
+
+ver 0.21.14 (2019/08/21)
+* decoder
+  - sidplay: show track durations in database
+  - sidplay: convert tag values from Windows-1252 charset
+  - sidplay: strip text from "Date" tag
+* player
+  - fix crash after song change
+  - fix seek position after restarting the decoder
+* protocol
+  - include command name in error responses
+
+ver 0.21.13 (2019/08/06)
+* input
+  - cdio_paranoia: require libcdio-paranoia 10.2+0.93+1
+* decoder
+  - mad: fix crackling sound (0.21.12 regression)
+* output
+  - jack: improved Windows compatibility
+
+ver 0.21.12 (2019/08/03)
+* decoder
+  - mad: update bit rate after seeking
+  - mad: fix several bugs preventing the plugin from decoding the last frame
+  - opus: ignore case in replay gain tag names
+  - opus, vorbis: decode the "end of stream" packet
+* output
+  - jack: fix mono-to-stereo conversion
+* player
+  - don't restart unseekable song after failed seek attempt
+* Windows
+  - support backslash in relative URIs loaded from playlists
+
+ver 0.21.11 (2019/07/03)
+* input
+  - tidal: deprecated because Tidal has changed the protocol
+* decoder
+  - wildmidi: log error if library initialization fails
+* output
+  - alsa: fix busy loop while draining
+  - alsa: fix missing drain call
+  - alsa: improve xrun-avoiding silence generator
+  - alsa: log when generating silence due to slow decoder
+  - alsa, osx: fix distortions with DSD_U32 and DoP on 32 bit CPUs
+* protocol
+  - fix "list" with multiple "group" levels
+
+ver 0.21.10 (2019/06/05)
+* decoder
+  - opus: fix duplicate tags
+* output
+  - httpd: reject some well-known URIs
+* fix crash bug (0.21.9 regression)
+
+ver 0.21.9 (2019/05/20)
+* input
+  - buffer: fix deadlock bug
+* Android
+  - fix crash on ARMv7
+  - request storage permission on Android 6+
+* fix spurious "single" mode bug
+
+ver 0.21.8 (2019/04/23)
+* input
+  - smbclient: download to buffer instead of throttling transfer
+* output
+  - httpd: add missing mutex lock
+  - httpd: fix use-after-free bug
+* playlist
+  - soundcloud: fix "Unsupported URI scheme" (0.21.6 regression)
+* fix Bonjour bug
+* fix build failure with GCC 9
+* fix build failure with -Ddatabase=false
+* systemd: add user socket unit
+* doc: "list file" is deprecated
+
+ver 0.21.7 (2019/04/03)
+* input
+  - qobuz/tidal: scan tags when loading a playlist
+* require Meson 0.49.0 for native libgcrypt-config support
+* fix build failure with -Dlocal_socket=false
+* Haiku
+  - fix build
+  - add version info
+
+ver 0.21.6 (2019/03/17)
+* protocol
+  - allow loading playlists specified as absolute filesystem paths
+  - fix negated filter expressions with multiple tag values
+  - fix "list" with filter expression
+  - omit empty playlist names in "listplaylists"
+* input
+  - cdio_paranoia: fix build failure due to missing #include
+* decoder
+  - opus: fix replay gain when there are no other tags
+  - opus: fix seeking to beginning of song
+  - vorbis: fix Tremor conflict resulting in crash
+* output
+  - pulse: work around error with unusual channel count
+  - osx: fix build failure
+* playlist
+  - flac: fix use-after-free bug
+* support abstract sockets on Linux
+* Windows
+  - remove the unused libwinpthread-1.dll dependency
+* Android
+  - enable SLES power saving mode
+
+ver 0.21.5 (2019/02/22)
+* protocol
+  - fix deadlock in "albumart" command
+  - fix "tagtypes disable" command
+* database
+  - simple: fix assertion failure
+  - fix assertion failures with mount points
+* storage
+  - udisks: fix "AlreadyMounted" error
+  - udisks: use relative path from mount URI
+  - fix memory leak
+* input
+  - buffer: fix crash bug when playing remote WAV file
+* tags
+  - ape: map "Album Artist"
+* output
+  - shout: add support for TLS
+* mixer
+  - pulse: add "scale_volume" setting
+
+ver 0.21.4 (2019/01/04)
+* database
+  - inotify: fix crash bug "terminate called after throwing ..."
+  - upnp: implement "list ... group"
+* output
+  - httpd: declare protocol "HTTP/1.1" instead of "ICY"
+* remove libwrap support
+* Windows
+  - fix "Failed to accept connection: unknown error"
+* fix Haiku build
+
+ver 0.21.3 (2018/11/16)
+* output
+  - alsa: fix crash bug
+  - alsa: fix stuttering at start of playback
+  - alsa: fix discarded samples at end of song
+  - alsa: clear error after reopening device
+* log: default to journal if MPD was started as systemd service
+
+ver 0.21.2 (2018/11/12)
+* protocol
+  - operator "=~" matches a regular expression
+  - operator "contains" matches substrings
+* decoder
+  - ffmpeg: require FFmpeg 3.1 or later
+  - ffmpeg: fix broken sound with certain codecs
+* output
+  - alsa: fix high CPU usage with dmix
+  - httpd: fix three crash bugs
+* mixer
+  - alsa: fix more rounding errors
+* fix zlib support
+
+ver 0.21.1 (2018/11/04)
+* protocol
+  - allow escaping quotes in filter expressions
+  - operator "==" never searches substrings in filter expressions
+* decoder
+  - ffmpeg: fix build failure with non-standard FFmpeg installation path
+  - flac: fix linker failure when building without FLAC support
+* encoder
+  - vorbis: fix linker failure when building without Vorbis decoder
+* fix build failure on Linux-PowerPC
+* fix build failure on FreeBSD
+* eliminate DLL dependencies on Windows
+* add warning about buggy Boost version 1.67
+* require Meson 0.47.2 because a Meson 0.47.1 bug breaks our build
+
+ver 0.21 (2018/10/31)
+* configuration
+  - add "include" directive, allows including config files
+  - incremental "metadata_to_use" setting
+* protocol
+  - "tagtypes" can be used to hide tags
+  - "find" and "search" can sort
+  - "outputs" prints the plugin name
+  - "outputset" sets runtime attributes
+  - close connection when client sends HTTP request
+  - new filter syntax for "find"/"search" etc. with negation
+* database
+  - simple: scan audio formats
+  - proxy: require libmpdclient 2.9
+  - proxy: forward `sort` and `window` to server
+* player
+  - hard-code "buffer_before_play" to 1 second, independent of audio format
+  - "one-shot" single mode
+* input
+  - curl: download to buffer instead of throttling transfer
+  - qobuz: new plugin to play Qobuz streams
+  - tidal: new plugin to play Tidal streams
+* tags
+  - new tags "OriginalDate", "MUSICBRAINZ_WORKID"
+* decoder
+  - ffmpeg: require at least version 11.12
+  - gme: try loading m3u sidecar files
+  - hybrid_dsd: new decoder plugin
+  - mad: move "gapless_mp3_playback" setting to "decoder" block
+  - mikmod: require at least version 3.2
+  - pcm: support audio/L24 (RFC 3190)
+  - sidplay: support basic and kernal rom (libsidplayfp)
+* resampler
+  - soxr: flush resampler at end of song
+* output
+  - alsa: non-blocking mode
+  - alsa: change "dop" and "allowed_formats" settings at runtime
+  - ao: fix crash bug due to partial frames
+  - shout: support the Shine encoder plugin
+  - sndio: remove support for the broken RoarAudio sndio emulation
+  - osx: initial support for DSD over PCM
+  - roar: removed
+  - httpd_output: support for unix sockets
+* mixer
+  - sndio: new mixer plugin
+* encoder
+  - opus: support for sending metadata using ogg stream chaining
+* listen on $XDG_RUNTIME_DIR/mpd/socket by default
+* append hostname to Zeroconf service name
+* systemd watchdog support
+* require GCC 6
+* build with Meson instead of autotools
+* use GTest instead of cppunit
+
+ver 0.20.23 (2018/10/29)
+* protocol
+  - emit "player" idle event when restarting the current song
+* fix broken float to s32 conversion
+* new clang crash bug workaround
+
+ver 0.20.22 (2018/10/23)
+* protocol
+  - add tag fallbacks for AlbumArtistSort, ArtistSort
+  - fix empty string filter on fallback tags
+  - "count group ..." can print an empty group
+  - fix broken command "list ... group"
+* storage
+  - curl: URL-encode paths
+* decoder
+  - fluidsynth: adapt to API change in version 2.0
+* Android
+  - now runs as a service
+  - add button to start/stop MPD
+  - add option to auto-start on boot
+* work around clang bug leading to crash
+* install the SVG icon
+
+ver 0.20.21 (2018/08/17)
+* database
+  - proxy: add "password" setting
+  - proxy: support tags "ArtistSort", "AlbumArtistSort", "AlbumSort"
+  - simple: allow .mpdignore comments only at start of line
+* output
+  - httpd: remove broken DLNA support code
+* playlist
+  - cue: support file type declaration "FLAC" (non-standard)
+* URI schemes are case insensitive
+* Android, Windows
+  - enable the "curl" storage plugin
+
+ver 0.20.20 (2018/05/22)
+* protocol
+  - fix "modified-since" filter regression
+* output
+  - pulse: cork stream when paused due to "single" mode
+* decoder
+  - dsdiff, dsf: support more MIME types
+  - dsdiff, dsf: allow 4 MB ID3 tags
+  - opus: support R128_ALBUM_GAIN tag
+* Android, Windows
+  - enable the "proxy" database plugin
+
+ver 0.20.19 (2018/04/26)
+* protocol
+  - validate absolute seek time, reject negative values
+* database
+  - proxy: fix "search already in progress" errors
+  - proxy: implement "list ... group"
+* input
+  - mms: fix lockup bug and a crash bug
+* decoder
+  - ffmpeg: fix av_register_all() deprecation warning (FFmpeg 4.0)
+* player
+  - fix spurious "Not seekable" error when switching radio streams
+* macOS: fix crash bug
+
 ver 0.20.18 (2018/02/24)
 * input
   - curl: allow authentication methods other than "Basic"

android/.gitignore

@@ -1 +0,0 @@
-/build

android/AndroidManifest.xml

@@ -2,23 +2,48 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           package="org.musicpd"
           android:installLocation="auto"
-          android:versionCode="17"
-          android:versionName="0.20.18">
+          android:versionCode="54"
+          android:versionName="0.22.6">
 
-  <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="17"/>
+  <uses-sdk android:minSdkVersion="21" android:targetSdkVersion="29"/>
 
-  <application android:icon="@drawable/icon" android:label="@string/app_name">
-    <activity android:name=".Main"
-              android:label="@string/app_name"
-              android:launchMode="singleInstance">
+  <uses-feature android:name="android.software.leanback"
+                android:required="false" />
+  <uses-feature android:name="android.hardware.touchscreen"
+                android:required="false" />
+
+  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
+  <uses-permission android:name="android.permission.WAKE_LOCK"/>
+  <uses-permission android:name="android.permission.INTERNET"/>
+  <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
+  <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+
+  <application android:allowBackup="true"
+               android:requestLegacyExternalStorage="true"
+               android:icon="@drawable/icon"
+               android:banner="@drawable/icon"
+               android:label="@string/app_name">
+    <activity android:name=".Settings"
+              android:label="@string/app_name">
       <intent-filter>
         <action android:name="android.intent.action.MAIN" />
         <category android:name="android.intent.category.LAUNCHER" />
       </intent-filter>
     </activity>
+    <activity android:name=".Settings"
+              android:label="@string/app_name" >
+      <intent-filter>
+        <action android:name="android.intent.action.MAIN" />
+        <category android:name="android.intent.category.LEANBACK_LAUNCHER" />
+      </intent-filter>
+    </activity>
+
+    <receiver android:name=".Receiver">
+      <intent-filter>
+        <action android:name="android.intent.action.BOOT_COMPLETED" />
+      </intent-filter>
+    </receiver>
+    <service android:name=".Main" android:process=":main"/>
   </application>
 
-  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
-  <uses-permission android:name="android.permission.WAKE_LOCK"/>
-  <uses-permission android:name="android.permission.INTERNET"/>
 </manifest>

android/apk/make-unsigned-apk.sh

@@ -0,0 +1,21 @@
+#!/bin/sh -e
+
+S=`dirname "$0"`
+ANDROID_ABI=$1
+STRIP=$2
+ZIP=$3
+UNSIGNED_APK=$4
+LIBMPD_SO=$5
+CLASSES_DEX=$6
+RESOURCES_APK=$7
+D=`dirname "$UNSIGNED_APK"`
+
+rm -rf "$D/apk"
+mkdir -p "$D/apk/lib/$ANDROID_ABI"
+
+"$STRIP" "$LIBMPD_SO" -o "$D/apk/lib/$ANDROID_ABI/`basename $LIBMPD_SO`"
+cp "$CLASSES_DEX" "$D/apk/"
+cp "$RESOURCES_APK" "$UNSIGNED_APK"
+
+cd "$D/apk"
+exec zip -q -r -X "../`basename $UNSIGNED_APK`" .

android/apk/meson.build

@@ -0,0 +1,59 @@
+unsigned_apk = custom_target(
+  'mpd-unsigned.apk',
+  output: 'mpd-unsigned.apk',
+  input: [mpd, classes_dex, resources_apk[0]],
+  command: [
+    join_paths(meson.current_source_dir(), 'make-unsigned-apk.sh'),
+    android_abi,
+    get_option('android_strip'),
+    zip,
+    '@OUTPUT0@',
+    '@INPUT@',
+  ],
+)
+
+if get_option('android_debug_keystore') != ''
+  debug_apk = custom_target(
+    'mpd-debug.apk',
+    output: 'mpd-debug.apk',
+    input: unsigned_apk,
+    command: [
+      jarsigner,
+      '-keystore', get_option('android_debug_keystore'),
+      '-storepass', 'android',
+      '-signedjar', '@OUTPUT@',
+      '@INPUT@',
+      'androiddebugkey',
+    ],
+    build_by_default: true
+  )
+endif
+
+if get_option('android_keystore') != '' and get_option('android_keyalias') != '' and get_option('android_keypass') != ''
+  unaligned_apk = custom_target(
+    'mpd-unaligned.apk',
+    output: 'mpd-unaligned.apk',
+    input: unsigned_apk,
+    command: [
+      jarsigner,
+      '-digestalg', 'SHA1', '-sigalg', 'MD5withRSA',
+      '-keystore', get_option('android_keystore'),
+      '-storepass', get_option('android_keypass'),
+      '-signedjar', '@OUTPUT@',
+      '@INPUT@',
+      get_option('android_keyalias'),
+    ],
+  )
+
+  apk = custom_target(
+    'mpd.apk',
+    output: 'mpd.apk',
+    input: unaligned_apk,
+    command: [
+      android_zipalign,
+      '-f', '4',
+      '@INPUT@', '@OUTPUT@',
+    ],
+    build_by_default: true
+  )
+endif

android/build.py

@@ -3,13 +3,14 @@
 import os, os.path
 import sys, subprocess
 
-if len(sys.argv) < 3:
-    print("Usage: build.py SDK_PATH NDK_PATH [configure_args...]", file=sys.stderr)
+if len(sys.argv) < 4:
+    print("Usage: build.py SDK_PATH NDK_PATH ABI [configure_args...]", file=sys.stderr)
     sys.exit(1)
 
 sdk_path = sys.argv[1]
 ndk_path = sys.argv[2]
-configure_args = sys.argv[3:]
+android_abi = sys.argv[3]
+configure_args = sys.argv[4:]
 
 if not os.path.isfile(os.path.join(sdk_path, 'tools', 'android')):
     print("SDK not found in", ndk_path, file=sys.stderr)
@@ -19,8 +20,43 @@ if not os.path.isdir(ndk_path):
     print("NDK not found in", ndk_path, file=sys.stderr)
     sys.exit(1)
 
+android_abis = {
+    'armeabi-v7a': {
+        'arch': 'arm-linux-androideabi',
+        'ndk_arch': 'arm',
+        'toolchain_arch': 'arm-linux-androideabi',
+        'llvm_triple': 'armv7-linux-androideabi',
+        'cflags': '-fpic -march=armv7-a -mfpu=vfpv3-d16 -mfloat-abi=softfp',
+    },
+
+    'arm64-v8a': {
+        'arch': 'aarch64-linux-android',
+        'ndk_arch': 'arm64',
+        'toolchain_arch': 'aarch64-linux-android',
+        'llvm_triple': 'aarch64-linux-android',
+        'cflags': '-fpic',
+    },
+
+    'x86': {
+        'arch': 'i686-linux-android',
+        'ndk_arch': 'x86',
+        'toolchain_arch': 'x86',
+        'llvm_triple': 'i686-linux-android',
+        'cflags': '-fPIC -march=i686 -mtune=intel -mssse3 -mfpmath=sse -m32',
+    },
+
+    'x86_64': {
+        'arch': 'x86_64-linux-android',
+        'ndk_arch': 'x86_64',
+        'toolchain_arch': 'x86_64',
+        'llvm_triple': 'x86_64-linux-android',
+        'cflags': '-fPIC -m64',
+    },
+}
+
 # select the NDK target
-arch = 'arm-linux-androideabi'
+abi_info = android_abis[android_abi]
+arch = abi_info['arch']
 
 # the path to the MPD sources
 mpd_path = os.path.abspath(os.path.join(os.path.dirname(sys.argv[0]) or '.', '..'))
@@ -28,6 +64,7 @@ sys.path[0] = os.path.join(mpd_path, 'python')
 
 # output directories
 from build.dirs import lib_path, tarball_path, src_path
+from build.meson import configure as run_meson
 
 arch_path = os.path.join(lib_path, arch)
 build_path = os.path.join(arch_path, 'build')
@@ -44,39 +81,35 @@ class AndroidNdkToolchain:
         self.src_path = src_path
         self.build_path = build_path
 
-        self.ndk_arch = 'arm'
-        android_abi = 'armeabi-v7a'
-        ndk_platform = 'android-14'
+        ndk_arch = abi_info['ndk_arch']
+        android_api_level = '21'
 
         # select the NDK compiler
         gcc_version = '4.9'
 
-        ndk_platform_path = os.path.join(ndk_path, 'platforms', ndk_platform)
-        sysroot = os.path.join(ndk_path, 'sysroot')
-        target_root = os.path.join(ndk_platform_path, 'arch-' + self.ndk_arch)
-
         install_prefix = os.path.join(arch_path, 'root')
 
         self.arch = arch
         self.install_prefix = install_prefix
-        self.sysroot = sysroot
 
-        toolchain_path = os.path.join(ndk_path, 'toolchains', arch + '-' + gcc_version, 'prebuilt', build_arch)
+        toolchain_path = os.path.join(ndk_path, 'toolchains', abi_info['toolchain_arch'] + '-' + gcc_version, 'prebuilt', build_arch)
         llvm_path = os.path.join(ndk_path, 'toolchains', 'llvm', 'prebuilt', build_arch)
-        llvm_triple = 'armv7-none-linux-androideabi'
+        llvm_triple = abi_info['llvm_triple'] + android_api_level
 
         common_flags = '-Os -g'
-        common_flags += ' -fPIC'
-        common_flags += ' -march=armv7-a -mfpu=vfp -mfloat-abi=softfp'
+        common_flags += ' ' + abi_info['cflags']
 
         toolchain_bin = os.path.join(toolchain_path, 'bin')
         llvm_bin = os.path.join(llvm_path, 'bin')
         self.cc = os.path.join(llvm_bin, 'clang')
         self.cxx = os.path.join(llvm_bin, 'clang++')
-        common_flags += ' -target ' + llvm_triple + ' -integrated-as -gcc-toolchain ' + toolchain_path
+        common_flags += ' -target ' + llvm_triple + ' -gcc-toolchain ' + toolchain_path
 
         common_flags += ' -fvisibility=hidden -fdata-sections -ffunction-sections'
 
+        # required flags from https://android.googlesource.com/platform/ndk/+/ndk-release-r20/docs/BuildSystemMaintainers.md#additional-required-arguments
+        common_flags += ' -fno-addrsig'
+
         self.ar = os.path.join(toolchain_bin, arch + '-ar')
         self.ranlib = os.path.join(toolchain_bin, arch + '-ranlib')
         self.nm = os.path.join(toolchain_bin, arch + '-nm')
@@ -84,48 +117,64 @@ class AndroidNdkToolchain:
 
         self.cflags = common_flags
         self.cxxflags = common_flags
-        self.cppflags = '--sysroot=' + sysroot + \
-            ' -isystem ' + os.path.join(install_prefix, 'include') + \
-            ' -isystem ' + os.path.join(sysroot, 'usr', 'include', arch) + \
-            ' -D__ANDROID_API__=14'
-        self.ldflags = '--sysroot=' + sysroot + \
-            ' -L' + os.path.join(install_prefix, 'lib') + \
-            ' -L' + os.path.join(target_root, 'usr', 'lib') + \
-            ' -B' + os.path.join(target_root, 'usr', 'lib') + \
+        self.cppflags = ' -isystem ' + os.path.join(install_prefix, 'include')
+        self.ldflags = ' -L' + os.path.join(install_prefix, 'lib') + \
+            ' -Wl,--exclude-libs=ALL' + \
             ' ' + common_flags
+        self.ldflags = common_flags
         self.libs = ''
 
-        self.is_arm = self.ndk_arch == 'arm'
+        self.is_arm = ndk_arch == 'arm'
         self.is_armv7 = self.is_arm and 'armv7' in self.cflags
+        self.is_aarch64 = ndk_arch == 'arm64'
         self.is_windows = False
 
-        libcxx_path = os.path.join(ndk_path, 'sources/cxx-stl/llvm-libc++')
-        libcxx_libs_path = os.path.join(libcxx_path, 'libs', android_abi)
+        libstdcxx_flags = ''
+        libstdcxx_cxxflags = ''
+        libstdcxx_ldflags = ''
+        libstdcxx_libs = '-static-libstdc++'
 
-        libstdcxx_flags = '-stdlib=libc++'
-        libstdcxx_cxxflags = libstdcxx_flags + ' -isystem ' + os.path.join(libcxx_path, 'include') + ' -isystem ' + os.path.join(ndk_path, 'sources/android/support/include')
-        libstdcxx_ldflags = libstdcxx_flags + ' -static-libstdc++ -L' + libcxx_libs_path
+        if self.is_armv7:
+            # On 32 bit ARM, clang generates no ".eh_frame" section;
+            # instead, the LLVM unwinder library is used for unwinding
+            # the stack after a C++ exception was thrown
+            libstdcxx_libs += ' -lunwind'
 
         if use_cxx:
             self.cxxflags += ' ' + libstdcxx_cxxflags
             self.ldflags += ' ' + libstdcxx_ldflags
+            self.libs += ' ' + libstdcxx_libs
 
         self.env = dict(os.environ)
 
         # redirect pkg-config to use our root directory instead of the
         # default one on the build host
-        self.env['PKG_CONFIG_LIBDIR'] = os.path.join(install_prefix, 'lib/pkgconfig')
+        import shutil
+        bin_dir = os.path.join(install_prefix, 'bin')
+        try:
+            os.makedirs(bin_dir)
+        except:
+            pass
+        self.pkg_config = shutil.copy(os.path.join(mpd_path, 'build', 'pkg-config.sh'),
+                                      os.path.join(bin_dir, 'pkg-config'))
+        self.env['PKG_CONFIG'] = self.pkg_config
 
 # a list of third-party libraries to be used by MPD on Android
 from build.libs import *
 thirdparty_libs = [
+    libmpdclient,
     libogg,
     libvorbis,
     opus,
     flac,
     libid3tag,
+    libmodplug,
+    wildmidi,
+    gme,
     ffmpeg,
+    openssl,
     curl,
+    libexpat,
     libnfs,
     boost,
 ]
@@ -141,32 +190,13 @@ for x in thirdparty_libs:
 toolchain = AndroidNdkToolchain(tarball_path, src_path, build_path,
                                 use_cxx=True)
 
-configure = [
-    os.path.join(mpd_path, 'configure'),
-    'CC=' + toolchain.cc,
-    'CXX=' + toolchain.cxx,
-    'CFLAGS=' + toolchain.cflags,
-    'CXXFLAGS=' + toolchain.cxxflags,
-    'CPPFLAGS=' + toolchain.cppflags,
-    'LDFLAGS=' + toolchain.ldflags,
-    'LIBS=' + toolchain.libs,
-    'AR=' + toolchain.ar,
-    'RANLIB=' + toolchain.ranlib,
-    'STRIP=' + toolchain.strip,
-    '--host=' + toolchain.arch,
-    '--prefix=' + toolchain.install_prefix,
-    '--with-sysroot=' + toolchain.sysroot,
-    '--with-android-sdk=' + sdk_path,
+configure_args += [
+    '-Dandroid_sdk=' + sdk_path,
+    '-Dandroid_ndk=' + ndk_path,
+    '-Dandroid_abi=' + android_abi,
+    '-Dandroid_strip=' + toolchain.strip,
+]
 
-    '--enable-silent-rules',
-
-    '--disable-icu',
-
-] + configure_args
-
-from build.cmdline import concatenate_cmdline_variables
-configure = concatenate_cmdline_variables(configure,
-    set(('CFLAGS', 'CXXFLAGS', 'CPPFLAGS', 'LDFLAGS', 'LIBS')))
-
-subprocess.check_call(configure, env=toolchain.env)
-subprocess.check_call(['/usr/bin/make', '--quiet', '-j12'], env=toolchain.env)
+from build.meson import configure as run_meson
+run_meson(toolchain, mpd_path, '.', configure_args)
+subprocess.check_call(['/usr/bin/ninja'], env=toolchain.env)

android/make-resources-apk.sh

@@ -0,0 +1,24 @@
+#!/bin/sh -e
+
+S=`dirname "$0"`
+AAPT=$1
+BASE_JAR=$2
+JAVA_PKG=$3
+JAVA_PKG_PATH=$4
+APK_FILE="$5"
+D=`dirname "$APK_FILE"`
+
+rm -rf "$D/res"
+mkdir -p "$D/res/drawable" "$D/src"
+cp "$D/icon.png" "$D/notification_icon.png"  "$D/res/drawable/"
+
+"$AAPT" package -f -m --auto-add-overlay \
+  --custom-package "$JAVA_PKG" \
+  -M "$S/AndroidManifest.xml" \
+  -S "$D/res" \
+  -S "$S/res" \
+  -J "$D/src" \
+  -I "$BASE_JAR" \
+  -F "$D/resources.apk"
+
+cp "$D/src/$JAVA_PKG_PATH/R.java" "$D/"

android/meson.build

@@ -0,0 +1,140 @@
+android_package = 'org.musicpd'
+android_package_path = join_paths(android_package.split('.'))
+
+android_ndk = get_option('android_ndk')
+android_sdk = get_option('android_sdk')
+android_abi = get_option('android_abi')
+
+android_sdk_build_tools_version = '29.0.3'
+android_sdk_platform = 'android-29'
+
+android_build_tools_dir = join_paths(android_sdk, 'build-tools', android_sdk_build_tools_version)
+android_sdk_platform_dir = join_paths(android_sdk, 'platforms', android_sdk_platform)
+
+android_aidl = join_paths(android_build_tools_dir, 'aidl')
+android_aapt = join_paths(android_build_tools_dir, 'aapt')
+android_dx = join_paths(android_build_tools_dir, 'dx')
+android_zipalign = join_paths(android_build_tools_dir, 'zipalign')
+
+javac = find_program('javac')
+jarsigner = find_program('jarsigner')
+rsvg_convert = find_program('rsvg-convert')
+convert = find_program('convert')
+zip = find_program('zip')
+
+common_cppflags += '-I' + join_paths(meson.current_build_dir(), 'include')
+
+#
+# AIDL
+#
+
+IMainCallback_java = custom_target(
+  'IMainCallback.java',
+  output: 'IMainCallback.java',
+  input: join_paths(meson.current_source_dir(), 'src', 'IMainCallback.aidl'),
+  command: [
+    join_paths(meson.current_source_dir(), 'run-aidl.sh'),
+    android_aidl,
+    '@INPUT@',
+    '@OUTPUT@',
+    join_paths(meson.current_build_dir(), 'src'),
+    android_package_path,
+  ],
+)
+
+IMain_java = custom_target(
+  'IMain.java',
+  output: 'IMain.java',
+  input: join_paths(meson.current_source_dir(), 'src', 'IMain.aidl'),
+  depends: IMainCallback_java,
+  command: [
+    join_paths(meson.current_source_dir(), 'run-aidl.sh'),
+    android_aidl,
+    '@INPUT@',
+    '@OUTPUT@',
+    join_paths(meson.current_build_dir(), 'src'),
+    android_package_path,
+  ],
+)
+
+#
+# Resources
+#
+
+android_icon = custom_target(
+  'Android icon',
+  output: 'icon.png',
+  input: '../mpd.svg',
+  command: [
+    rsvg_convert, '--width=48', '--height=48', '@INPUT@', '-o', '@OUTPUT@',
+  ],
+)
+
+android_notification_icon = custom_target(
+  'Android notification icon',
+  output: 'notification_icon.png',
+  input: android_icon,
+  command: [
+    convert, '@INPUT@', '-colorspace', 'Gray', '-gamma', '2.2', '@OUTPUT@',
+  ],
+)
+
+resources_apk = custom_target(
+  'resources.apk',
+  output: ['resources.apk', 'R.java'],
+  input: [
+    'res/layout/custom_notification_gb.xml',
+    'res/layout/log_item.xml',
+    'res/layout/settings.xml',
+    'res/values/strings.xml',
+    android_icon,
+    android_notification_icon,
+  ],
+  command: [
+    join_paths(meson.current_source_dir(), 'make-resources-apk.sh'),
+    android_aapt,
+    join_paths(android_sdk_platform_dir, 'android.jar'),
+    android_package,
+    android_package_path,
+    '@OUTPUT0@',
+  ],
+)
+
+#
+# Compile Java
+#
+
+classes_jar = custom_target(
+  'classes.jar',
+  output: 'classes.jar',
+  input: [
+    'src/Bridge.java',
+    'src/Loader.java',
+    'src/Main.java',
+    'src/Receiver.java',
+    'src/Settings.java',
+    IMain_java,
+    IMainCallback_java,
+    resources_apk[1],
+  ],
+  command: [
+    join_paths(meson.current_source_dir(), 'run-javac.sh'),
+    javac,
+    join_paths(android_sdk_platform_dir, 'android.jar'),
+    android_package_path,
+    zip,
+    '@OUTPUT@',
+    '@INPUT@',
+  ],
+)
+
+classes_dex = custom_target(
+  'classes.dex',
+  output: 'classes.dex',
+  input: classes_jar,
+  command: [
+    android_dx,
+    '--dex', '--output', '@OUTPUT@',
+    '@INPUT@',
+  ],
+)

android/res/layout/custom_notification_gb.xml

@@ -0,0 +1,22 @@
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/layout"
+    android:layout_width="fill_parent"
+    android:layout_height="fill_parent"
+    android:padding="10dp" >
+    <ImageView android:id="@+id/image"
+        android:layout_width="wrap_content"
+        android:layout_height="fill_parent"
+        android:layout_alignParentLeft="true"
+        android:layout_marginRight="10dp" />
+    <TextView android:id="@+id/title"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_toRightOf="@id/image"
+        style="Custom Notification Title" />
+    <TextView android:id="@+id/text"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_toRightOf="@id/image"
+        android:layout_below="@id/title"
+        style="Custom Notification Text" />
+</RelativeLayout>

android/res/layout/log_item.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<TextView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:typeface="monospace" />

android/res/layout/settings.xml

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical" >
+
+    <ToggleButton
+        android:id="@+id/run"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:textOn="@string/toggle_button_run_on"
+        android:textOff="@string/toggle_button_run_off" />
+
+    <CheckBox
+        android:id="@+id/run_on_boot"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/checkbox_run_on_boot" />
+
+    <CheckBox
+        android:id="@+id/wakelock"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/checkbox_wakelock" />
+
+    <TextView
+        android:id="@+id/status"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
+
+    <ListView
+		android:id="@+id/log_list"
+	    android:layout_width="match_parent"
+	    android:layout_height="wrap_content"
+	    android:paddingTop="10dip" />
+
+</LinearLayout>

android/res/values/strings.xml

@@ -2,4 +2,10 @@
 
 <resources>
   <string name="app_name">MPD</string>
+  <string name="notification_title_mpd_running">Music Player Daemon is running</string>
+  <string name="notification_text_mpd_running">Touch for MPD options.</string>
+  <string name="toggle_button_run_on">MPD is running</string>
+  <string name="toggle_button_run_off">MPD is not running</string>
+  <string name="checkbox_run_on_boot">Run MPD automatically on boot</string>
+  <string name="checkbox_wakelock">Prevent suspend when MPD is running (Wakelock)</string>
 </resources>

android/run-aidl.sh

@@ -0,0 +1,12 @@
+#!/bin/sh -e
+
+AIDL=$1
+SRC=$2
+DST=$3
+GENSRC=$4
+JAVA_PKG_PATH=$5
+
+mkdir -p "$GENSRC/$JAVA_PKG_PATH"
+cp "$SRC" "$GENSRC/$JAVA_PKG_PATH/"
+"$AIDL" -I"$GENSRC" -o"$GENSRC" "$GENSRC/$JAVA_PKG_PATH/`basename $SRC`"
+exec cp "$GENSRC/$JAVA_PKG_PATH/`basename $DST`" "$DST"

android/run-javac.sh

@@ -0,0 +1,22 @@
+#!/bin/sh -e
+
+JAVAC=$1
+CLASSPATH=$2
+JAVA_PKG_PATH=$3
+ZIP=$4
+JARFILE=`realpath "$5"`
+shift 5
+
+D=`dirname "$JARFILE"`
+GENSRC="$D/src"
+GENCLASS="$D/classes"
+GENINCLUDE="$D/include"
+
+mkdir -p "$GENSRC/$JAVA_PKG_PATH"
+"$JAVAC" -source 1.6 -target 1.6 -Xlint:-options \
+	 -cp "$CLASSPATH" \
+	 -h "$GENINCLUDE" \
+	 -d "$GENCLASS" \
+	 "$@"
+cd "$GENCLASS"
+zip -q -r "$JARFILE" .

android/src/Bridge.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -25,6 +25,12 @@ import android.content.Context;
  * Bridge to native code.
  */
 public class Bridge {
-	public static native void run(Context context);
+
+	/* used by jni */
+	public interface LogListener {
+		public void onLog(int priority, String msg);
+	}
+
+	public static native void run(Context context, LogListener logListener);
 	public static native void shutdown();
 }

android/src/IMain.aidl

@@ -0,0 +1,12 @@
+package org.musicpd;
+import org.musicpd.IMainCallback;
+
+interface IMain
+{
+    void start();
+    void stop();
+    void setWakelockEnabled(boolean enabled);
+    boolean isRunning();
+    void registerCallback(IMainCallback cb);
+    void unregisterCallback(IMainCallback cb);
+}

android/src/IMainCallback.aidl

@@ -0,0 +1,9 @@
+package org.musicpd;
+
+interface IMainCallback
+{
+    void onStarted();
+    void onStopped();
+    void onError(String error);
+    void onLog(int priority, String msg);
+}

android/src/Loader.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify

android/src/Main.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -19,57 +19,401 @@
 
 package org.musicpd;
 
-import android.app.Activity;
-import android.os.Bundle;
+import android.annotation.TargetApi;
+import android.app.Notification;
+import android.app.NotificationManager;
+import android.app.PendingIntent;
+import android.app.Service;
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.content.ServiceConnection;
 import android.os.Build;
-import android.os.Handler;
-import android.os.Message;
-import android.widget.TextView;
+import android.os.IBinder;
+import android.os.PowerManager;
+import android.os.RemoteCallbackList;
+import android.os.RemoteException;
 import android.util.Log;
+import android.widget.RemoteViews;
 
-public class Main extends Activity implements Runnable {
-	private static final String TAG = "MPD";
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Method;
 
-	Thread thread;
+public class Main extends Service implements Runnable {
+	private static final String TAG = "Main";
+	private static final String REMOTE_ERROR = "MPD process was killed";
+	private static final int MAIN_STATUS_ERROR = -1;
+	private static final int MAIN_STATUS_STOPPED = 0;
+	private static final int MAIN_STATUS_STARTED = 1;
 
-	TextView textView;
+	private static final int MSG_SEND_STATUS = 0;
+	private static final int MSG_SEND_LOG = 1;
 
-	final Handler quitHandler = new Handler() {
-			public void handleMessage(Message msg) {
-				textView.setText("Music Player Daemon has quit");
+	private Thread mThread = null;
+	private int mStatus = MAIN_STATUS_STOPPED;
+	private boolean mAbort = false;
+	private String mError = null;
+	private final RemoteCallbackList<IMainCallback> mCallbacks = new RemoteCallbackList<IMainCallback>();
+	private final IBinder mBinder = new MainStub(this);
+	private PowerManager.WakeLock mWakelock = null;
 
-				// TODO: what now?  restart?
+	static class MainStub extends IMain.Stub {
+		private Main mService;
+		MainStub(Main service) {
+			mService = service;
+		}
+		public void start() {
+			mService.start();
+		}
+		public void stop() {
+			mService.stop();
+		}
+		public void setWakelockEnabled(boolean enabled) {
+			mService.setWakelockEnabled(enabled);
+		}
+		public boolean isRunning() {
+			return mService.isRunning();
+		}
+		public void registerCallback(IMainCallback cb) {
+			mService.registerCallback(cb);
+		}
+		public void unregisterCallback(IMainCallback cb) {
+			mService.unregisterCallback(cb);
+		}
+	}
+
+	private synchronized void sendMessage(int what, int arg1, int arg2, Object obj) {
+		int i = mCallbacks.beginBroadcast();
+		while (i > 0) {
+			i--;
+			final IMainCallback cb = mCallbacks.getBroadcastItem(i);
+			try {
+				switch (what) {
+				case MSG_SEND_STATUS:
+					switch (arg1) {
+					case MAIN_STATUS_ERROR:
+						cb.onError((String)obj);
+						break;
+					case MAIN_STATUS_STOPPED:
+						cb.onStopped();
+						break;
+					case MAIN_STATUS_STARTED:
+						cb.onStarted();
+						break;
+					}
+					break;
+				case MSG_SEND_LOG:
+					cb.onLog(arg1, (String) obj);
+					break;
+				}
+			} catch (RemoteException e) {
+			}
+		}
+		mCallbacks.finishBroadcast();
+	}
+
+	private Bridge.LogListener mLogListener = new Bridge.LogListener() {
+		@Override
+		public void onLog(int priority, String msg) {
+			sendMessage(MSG_SEND_LOG, priority, 0, msg);
+		}
+	};
+
+	@Override
+	public IBinder onBind(Intent intent) {
+		return mBinder;
+	}
+
+	@Override
+	public int onStartCommand(Intent intent, int flags, int startId) {
+		start();
+		if (intent != null && intent.getBooleanExtra("wakelock", false))
+			setWakelockEnabled(true);
+		return START_STICKY;
+	}
+
+	@Override
+	public void run() {
+		if (!Loader.loaded) {
+			final String error = "Failed to load the native MPD libary.\n" +
+				"Report this problem to us, and include the following information:\n" +
+				"SUPPORTED_ABIS=" + String.join(", ", Build.SUPPORTED_ABIS) + "\n" +
+				"PRODUCT=" + Build.PRODUCT + "\n" +
+				"FINGERPRINT=" + Build.FINGERPRINT + "\n" +
+				"error=" + Loader.error;
+			setStatus(MAIN_STATUS_ERROR, error);
+			stopSelf();
+			return;
+		}
+		synchronized (this) {
+			if (mAbort)
+				return;
+			setStatus(MAIN_STATUS_STARTED, null);
+		}
+		Bridge.run(this, mLogListener);
+		setStatus(MAIN_STATUS_STOPPED, null);
+	}
+
+	private synchronized void setStatus(int status, String error) {
+		mStatus = status;
+		mError = error;
+		sendMessage(MSG_SEND_STATUS, mStatus, 0, mError);
+	}
+
+	private Notification.Builder createNotificationBuilderWithChannel() {
+		final NotificationManager notificationManager = (NotificationManager) this.getSystemService(Context.NOTIFICATION_SERVICE);
+		if (notificationManager == null)
+			return null;
+
+		final String id = "org.musicpd";
+		final String name = "MPD service";
+		final int importance = 3; /* NotificationManager.IMPORTANCE_DEFAULT */
+
+		try {
+			Class<?> ncClass = Class.forName("android.app.NotificationChannel");
+			Constructor<?> ncCtor = ncClass.getConstructor(String.class, CharSequence.class, int.class);
+			Object nc = ncCtor.newInstance(id, name, importance);
+
+			Method nmCreateNotificationChannelMethod =
+				NotificationManager.class.getMethod("createNotificationChannel", ncClass);
+			nmCreateNotificationChannelMethod.invoke(notificationManager, nc);
+
+			Constructor nbCtor = Notification.Builder.class.getConstructor(Context.class, String.class);
+			return (Notification.Builder) nbCtor.newInstance(this, id);
+		} catch (Exception e)
+		{
+			Log.e(TAG, "error creating the NotificationChannel", e);
+			return null;
+		}
+	}
+
+	private void start() {
+		if (mThread != null)
+			return;
+
+		final Intent mainIntent = new Intent(this, Settings.class);
+		mainIntent.setAction("android.intent.action.MAIN");
+		mainIntent.addCategory("android.intent.category.LAUNCHER");
+		final PendingIntent contentIntent = PendingIntent.getActivity(this, 0,
+				mainIntent, PendingIntent.FLAG_CANCEL_CURRENT);
+
+		Notification.Builder nBuilder;
+		if (Build.VERSION.SDK_INT >= 26 /* Build.VERSION_CODES.O */)
+		{
+			nBuilder = createNotificationBuilderWithChannel();
+			if (nBuilder == null)
+				return;
+		}
+		else
+			nBuilder = new Notification.Builder(this);
+
+		Notification notification = nBuilder.setContentTitle(getText(R.string.notification_title_mpd_running))
+			.setContentText(getText(R.string.notification_text_mpd_running))
+			.setSmallIcon(R.drawable.notification_icon)
+			.setContentIntent(contentIntent)
+			.build();
+
+		mThread = new Thread(this);
+		mThread.start();
+
+		startForeground(R.string.notification_title_mpd_running, notification);
+		startService(new Intent(this, Main.class));
+	}
+
+	private void stop() {
+		if (mThread != null) {
+			if (mThread.isAlive()) {
+				synchronized (this) {
+					if (mStatus == MAIN_STATUS_STARTED)
+						Bridge.shutdown();
+					else
+						mAbort = true;
+				}
+			}
+			try {
+				mThread.join();
+				mThread = null;
+				mAbort = false;
+			} catch (InterruptedException ie) {}
+		}
+		setWakelockEnabled(false);
+		stopForeground(true);
+		stopSelf();
+	}
+
+	private void setWakelockEnabled(boolean enabled) {
+		if (enabled && mWakelock == null) {
+			PowerManager pm = (PowerManager)getSystemService(Context.POWER_SERVICE);
+			mWakelock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, TAG);
+			mWakelock.acquire();
+			Log.d(TAG, "Wakelock acquired");
+		} else if (!enabled && mWakelock != null) {
+			mWakelock.release();
+			mWakelock = null;
+			Log.d(TAG, "Wakelock released");
+		}
+	}
+
+	private boolean isRunning() {
+		return mThread != null && mThread.isAlive();
+	}
+
+	private void registerCallback(IMainCallback cb) {
+		if (cb != null) {
+			mCallbacks.register(cb);
+			sendMessage(MSG_SEND_STATUS, mStatus, 0, mError);
+		}
+	}
+
+	private void unregisterCallback(IMainCallback cb) {
+		if (cb != null) {
+			mCallbacks.unregister(cb);
+		}
+	}
+
+	/*
+	 * Client that bind the Main Service in order to send commands and receive callback
+	 */
+	public static class Client {
+
+		public interface Callback {
+			public void onStarted();
+			public void onStopped();
+			public void onError(String error);
+			public void onLog(int priority, String msg);
+		}
+
+		private boolean mBound = false;
+		private final Context mContext;
+		private Callback mCallback;
+		private IMain mIMain = null;
+
+		private final IMainCallback.Stub mICallback = new IMainCallback.Stub() {
+
+			@Override
+			public void onStopped() throws RemoteException {
+				mCallback.onStopped();
+			}
+
+			@Override
+			public void onStarted() throws RemoteException {
+				mCallback.onStarted();
+			}
+
+			@Override
+			public void onError(String error) throws RemoteException {
+				mCallback.onError(error);
+			}
+
+			@Override
+			public void onLog(int priority, String msg) throws RemoteException {
+				mCallback.onLog(priority, msg);
 			}
 		};
 
-	@Override protected void onCreate(Bundle savedInstanceState) {
-		super.onCreate(savedInstanceState);
+		private final ServiceConnection mServiceConnection = new ServiceConnection() {
 
-		if (!Loader.loaded) {
-			TextView tv = new TextView(this);
-			tv.setText("Failed to load the native MPD libary.\n" +
-				   "Report this problem to us, and include the following information:\n" +
-				   "ABI=" + Build.CPU_ABI + "\n" +
-				   "PRODUCT=" + Build.PRODUCT + "\n" +
-				   "FINGERPRINT=" + Build.FINGERPRINT + "\n" +
-				   "error=" + Loader.error);
-			setContentView(tv);
-			return;
+			@Override
+			public void onServiceConnected(ComponentName name, IBinder service) {
+				synchronized (this) {
+					mIMain = IMain.Stub.asInterface(service);
+					try {
+						if (mCallback != null)
+							mIMain.registerCallback(mICallback);
+					} catch (RemoteException e) {
+						if (mCallback != null)
+							mCallback.onError(REMOTE_ERROR);
+					}
+				}
+			}
+
+			@Override
+			public void onServiceDisconnected(ComponentName name) {
+				if (mCallback != null)
+					mCallback.onError(REMOTE_ERROR);
+			}
+		};
+
+		public Client(Context context, Callback cb) throws IllegalArgumentException {
+			if (context == null)
+				throw new IllegalArgumentException("Context can't be null");
+			mContext = context;
+			mCallback = cb;
+			mBound = mContext.bindService(new Intent(mContext, Main.class), mServiceConnection, Context.BIND_AUTO_CREATE);
 		}
 
-		if (thread == null || !thread.isAlive()) {
-			thread = new Thread(this, "NativeMain");
-			thread.start();
+		public boolean start() {
+			synchronized (this) {
+				if (mIMain != null) {
+					try {
+						mIMain.start();
+						return true;
+					} catch (RemoteException e) {
+					}
+				}
+				return false;
+			}
 		}
 
-		textView = new TextView(this);
-		textView.setText("Music Player Daemon is running"
-				 + "\nCAUTION: this version is EXPERIMENTAL!");
-		setContentView(textView);
+		public boolean stop() {
+			synchronized (this) {
+				if (mIMain != null) {
+					try {
+						mIMain.stop();
+						return true;
+					} catch (RemoteException e) {
+					}
+				}
+				return false;
+			}
+		}
+
+		public boolean setWakelockEnabled(boolean enabled) {
+			synchronized (this) {
+				if (mIMain != null) {
+					try {
+						mIMain.setWakelockEnabled(enabled);
+						return true;
+					} catch (RemoteException e) {
+					}
+				}
+				return false;
+			}
+		}
+
+		public boolean isRunning() {
+			synchronized (this) {
+				if (mIMain != null) {
+					try {
+						return mIMain.isRunning();
+					} catch (RemoteException e) {
+					}
+				}
+				return false;
+			}
+		}
+
+		public void release() {
+			if (mBound) {
+				synchronized (this) {
+					if (mIMain != null && mICallback != null) {
+						try {
+							if (mCallback != null)
+								mIMain.unregisterCallback(mICallback);
+						} catch (RemoteException e) {
+						}
+					}
+				}
+				mBound = false;
+				mContext.unbindService(mServiceConnection);
+			}
+		}
 	}
 
-	@Override public void run() {
-		Bridge.run(this);
-		quitHandler.sendMessage(quitHandler.obtainMessage());
+	/*
+	 * start Main service without any callback
+	 */
+	public static void start(Context context, boolean wakelock) {
+		context.startService(new Intent(context, Main.class).putExtra("wakelock", wakelock));
 	}
 }

android/src/Receiver.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2003-2021 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+package org.musicpd;
+
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.util.Log;
+
+public class Receiver extends BroadcastReceiver {
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        Log.d("Receiver", "onReceive: " + intent);
+        if (intent.getAction() == "android.intent.action.BOOT_COMPLETED") {
+        	if (Settings.Preferences.getBoolean(context,
+        			Settings.Preferences.KEY_RUN_ON_BOOT, false)) {
+        		final boolean wakelock = Settings.Preferences.getBoolean(context,
+        				Settings.Preferences.KEY_WAKELOCK, false);
+        		Main.start(context, wakelock);
+        	}
+        }
+    }
+}

android/src/Settings.java

@@ -0,0 +1,290 @@
+/*
+ * Copyright 2003-2021 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+package org.musicpd;
+
+import java.util.LinkedList;
+
+import android.Manifest;
+import android.app.Activity;
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.content.SharedPreferences.Editor;
+import android.content.pm.PackageManager;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.Message;
+import android.util.Log;
+import android.widget.ArrayAdapter;
+import android.widget.CheckBox;
+import android.widget.CompoundButton;
+import android.widget.CompoundButton.OnCheckedChangeListener;
+import android.widget.ListView;
+import android.widget.TextView;
+import android.widget.ToggleButton;
+
+public class Settings extends Activity {
+	private static final String TAG = "Settings";
+	private Main.Client mClient;
+	private TextView mTextStatus;
+	private ToggleButton mRunButton;
+	private boolean mFirstRun;
+	private LinkedList<String> mLogListArray = new LinkedList<String>();
+	private ListView mLogListView;
+	private ArrayAdapter<String> mLogListAdapter;
+
+	private static final int MAX_LOGS = 500;
+
+	private static final int MSG_ERROR = 0;
+	private static final int MSG_STOPPED = 1;
+	private static final int MSG_STARTED = 2;
+	private static final int MSG_LOG = 3;
+
+	public static class Preferences {
+		public static final String KEY_RUN_ON_BOOT ="run_on_boot";
+		public static final String KEY_WAKELOCK ="wakelock";
+
+		public static SharedPreferences get(Context context) {
+			return context.getSharedPreferences(TAG, MODE_PRIVATE);
+		}
+
+		public static void putBoolean(Context context, String key, boolean value) {
+			final SharedPreferences prefs = get(context);
+
+			if (prefs == null)
+				return;
+			final Editor editor = prefs.edit();
+			editor.putBoolean(key, value);
+			editor.apply();
+		}
+
+		public static boolean getBoolean(Context context, String key, boolean defValue) {
+			final SharedPreferences prefs = get(context);
+
+			return prefs != null ? prefs.getBoolean(key, defValue) : defValue;
+		}
+	}
+
+	private Handler mHandler = new Handler(new Handler.Callback() {
+		@Override
+		public boolean handleMessage(Message msg) {
+			switch (msg.what) {
+			case MSG_ERROR:
+				Log.d(TAG, "onError");
+
+				mClient.release();
+				connectClient();
+
+				mRunButton.setEnabled(false);
+				mRunButton.setChecked(false);
+
+				mTextStatus.setText((String)msg.obj);
+				mFirstRun = true;
+				break;
+			case MSG_STOPPED:
+				Log.d(TAG, "onStopped");
+				mRunButton.setEnabled(true);
+				if (!mFirstRun && Preferences.getBoolean(Settings.this, Preferences.KEY_RUN_ON_BOOT, false))
+					mRunButton.setChecked(true);
+				else
+					mRunButton.setChecked(false);
+				mFirstRun = true;
+				mTextStatus.setText("");
+				break;
+			case MSG_STARTED:
+				Log.d(TAG, "onStarted");
+				mRunButton.setChecked(true);
+				mFirstRun = true;
+				mTextStatus.setText("MPD service started");
+				break;
+			case MSG_LOG:
+				if (mLogListArray.size() > MAX_LOGS)
+					mLogListArray.remove(0);
+				String priority;
+				switch (msg.arg1) {
+				case Log.DEBUG:
+					priority = "D";
+					break;
+				case Log.ERROR:
+					priority = "E";
+					break;
+				case Log.INFO:
+					priority = "I";
+					break;
+				case Log.VERBOSE:
+					priority = "V";
+					break;
+				case Log.WARN:
+					priority = "W";
+					break;
+				default:
+					priority = "";
+				}
+				mLogListArray.add(priority + "/ " + (String)msg.obj);
+				mLogListAdapter.notifyDataSetChanged();
+
+				break;
+			}
+			return true;
+		}
+	});
+
+	private final OnCheckedChangeListener mOnRunChangeListener = new OnCheckedChangeListener() {
+		@Override
+		public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
+			if (mClient != null) {
+				if (isChecked) {
+					mClient.start();
+					if (Preferences.getBoolean(Settings.this,
+							Preferences.KEY_WAKELOCK, false))
+						mClient.setWakelockEnabled(true);
+				} else {
+					mClient.stop();
+				}
+			}
+		}
+	};
+
+	private final OnCheckedChangeListener mOnRunOnBootChangeListener = new OnCheckedChangeListener() {
+		@Override
+		public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
+			Preferences.putBoolean(Settings.this, Preferences.KEY_RUN_ON_BOOT, isChecked);
+			if (isChecked && mClient != null && !mRunButton.isChecked())
+				mRunButton.setChecked(true);
+		}
+	};
+
+	private final OnCheckedChangeListener mOnWakelockChangeListener = new OnCheckedChangeListener() {
+		@Override
+		public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
+			Preferences.putBoolean(Settings.this, Preferences.KEY_WAKELOCK, isChecked);
+			if (mClient != null && mClient.isRunning())
+				mClient.setWakelockEnabled(isChecked);
+		}
+	};
+
+	@Override
+	protected void onCreate(Bundle savedInstanceState) {
+		/* TODO: this sure is the wrong place to request
+		   permissions - it will cause MPD to quit
+		   immediately; we should request permissions when we
+		   need them, but implementing that is complicated, so
+		   for now, we do it here to give users a quick
+		   solution for the problem */
+		requestAllPermissions();
+
+		setContentView(R.layout.settings);
+		mRunButton = (ToggleButton) findViewById(R.id.run);
+		mRunButton.setOnCheckedChangeListener(mOnRunChangeListener);
+
+		mTextStatus = (TextView) findViewById(R.id.status);
+
+		mLogListAdapter = new ArrayAdapter<String>(this, R.layout.log_item, mLogListArray);
+
+		mLogListView = (ListView) findViewById(R.id.log_list);
+		mLogListView.setAdapter(mLogListAdapter);
+		mLogListView.setTranscriptMode(ListView.TRANSCRIPT_MODE_NORMAL);
+
+		CheckBox checkbox = (CheckBox) findViewById(R.id.run_on_boot);
+		checkbox.setOnCheckedChangeListener(mOnRunOnBootChangeListener);
+		if (Preferences.getBoolean(this, Preferences.KEY_RUN_ON_BOOT, false))
+			checkbox.setChecked(true);
+
+		checkbox = (CheckBox) findViewById(R.id.wakelock);
+		checkbox.setOnCheckedChangeListener(mOnWakelockChangeListener);
+		if (Preferences.getBoolean(this, Preferences.KEY_WAKELOCK, false))
+			checkbox.setChecked(true);
+
+		super.onCreate(savedInstanceState);
+	}
+
+	private void checkRequestPermission(String permission) {
+		if (checkSelfPermission(permission) == PackageManager.PERMISSION_GRANTED)
+			return;
+
+		try {
+			this.requestPermissions(new String[]{permission}, 0);
+		} catch (Exception e) {
+			Log.e(TAG, "requestPermissions(" + permission + ") failed",
+			      e);
+		}
+	}
+
+	private void requestAllPermissions() {
+		if (android.os.Build.VERSION.SDK_INT < 23)
+			/* we don't need to request permissions on
+			   this old Android version */
+			return;
+
+		/* starting with Android 6.0, we need to explicitly
+		   request all permissions before using them;
+		   mentioning them in the manifest is not enough */
+
+		checkRequestPermission(Manifest.permission.READ_EXTERNAL_STORAGE);
+	}
+
+	private void connectClient() {
+		mClient = new Main.Client(this, new Main.Client.Callback() {
+
+			private void removeMessages() {
+				/* don't remove log messages */
+				mHandler.removeMessages(MSG_STOPPED);
+				mHandler.removeMessages(MSG_STARTED);
+				mHandler.removeMessages(MSG_ERROR);
+			}
+
+			@Override
+			public void onStopped() {
+				removeMessages();
+				mHandler.sendEmptyMessage(MSG_STOPPED);
+			}
+
+			@Override
+			public void onStarted() {
+				removeMessages();
+				mHandler.sendEmptyMessage(MSG_STARTED);
+			}
+
+			@Override
+			public void onError(String error) {
+				removeMessages();
+				mHandler.sendMessage(Message.obtain(mHandler, MSG_ERROR, error));
+			}
+
+			@Override
+			public void onLog(int priority, String msg) {
+				mHandler.sendMessage(Message.obtain(mHandler, MSG_LOG, priority, 0, msg));
+			}
+		});
+	}
+
+	@Override
+	protected void onStart() {
+		mFirstRun = false;
+		connectClient();
+		super.onStart();
+	}
+
+	@Override
+	protected void onStop() {
+		mClient.release();
+		mClient = null;
+		super.onStop();
+	}
+}

autogen.sh

@@ -1,11 +0,0 @@
-#!/bin/sh
-
-set -e
-
-rm -rf config.cache build
-mkdir build
-
-aclocal -I m4 $ACLOCAL_FLAGS
-autoheader
-automake --add-missing $AUTOMAKE_FLAGS
-autoconf

build/pkg-config.sh

@@ -0,0 +1,13 @@
+#!/bin/sh -e
+
+# This is a wrapper for pkg-config which helps with cross-compiling;
+# it sets up environment variables to pkg-config searches for
+# libraries in the sysroot where a copy of this script is located.
+
+BIN=`dirname $0`
+ROOT=`dirname "$BIN"`
+
+export PKG_CONFIG_DIR=
+export PKG_CONFIG_LIBDIR="${ROOT}/lib/pkgconfig:${ROOT}/share/pkgconfig"
+
+exec /usr/bin/pkg-config "$@"

doc/conf.py

@@ -0,0 +1,218 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# -- General configuration ------------------------------------------------
+
+# If your documentation needs a minimal Sphinx version, state it here.
+#
+# needs_sphinx = '1.0'
+
+# Add any Sphinx extension module names here, as strings. They can be
+# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
+# ones.
+extensions = ['sphinx.ext.intersphinx']
+
+# Add any paths that contain templates here, relative to this directory.
+templates_path = ['_templates']
+
+# The suffix(es) of source filenames.
+# You can specify multiple suffix as a list of string:
+#
+# source_suffix = ['.rst', '.md']
+source_suffix = '.rst'
+
+# The encoding of source files.
+#
+# source_encoding = 'utf-8-sig'
+
+# The master toctree document.
+master_doc = 'index'
+
+# General information about the project.
+project = 'Music Player Daemon'
+copyright = '2003-2020 The Music Player Daemon Project'
+author = 'Max Kellermann'
+
+# The version info for the project you're documenting, acts as replacement for
+# |version| and |release|, also used in various other places throughout the
+# built documents.
+#
+# The short X.Y version.
+version = '0.22.6'
+# The full version, including alpha/beta/rc tags.
+release = version
+
+# The language for content autogenerated by Sphinx. Refer to documentation
+# for a list of supported languages.
+#
+# This is also used if you do content translation via gettext catalogs.
+# Usually you set "language" from the command line for these cases.
+language = None
+
+# There are two options for replacing |today|: either, you set today to some
+# non-false value, then it is used:
+#
+# today = ''
+#
+# Else, today_fmt is used as the format for a strftime call.
+#
+# today_fmt = '%B %d, %Y'
+
+# List of patterns, relative to source directory, that match files and
+# directories to ignore when looking for source files.
+# This patterns also effect to html_static_path and html_extra_path
+exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store']
+
+# The reST default role (used for this markup: `text`) to use for all
+# documents.
+#
+# default_role = None
+
+# If true, '()' will be appended to :func: etc. cross-reference text.
+#
+# add_function_parentheses = True
+
+# If true, the current module name will be prepended to all description
+# unit titles (such as .. function::).
+#
+# add_module_names = True
+
+# If true, sectionauthor and moduleauthor directives will be shown in the
+# output. They are ignored by default.
+#
+# show_authors = False
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = 'sphinx'
+
+# A list of ignored prefixes for module index sorting.
+# modindex_common_prefix = []
+
+# If true, keep warnings as "system message" paragraphs in the built documents.
+# keep_warnings = False
+
+# If true, `todo` and `todoList` produce output, else they produce nothing.
+todo_include_todos = False
+
+
+# -- Options for HTML output ----------------------------------------------
+
+# The theme to use for HTML and HTML Help pages.  See the documentation for
+# a list of builtin themes.
+#
+html_theme = 'classic'
+
+# Theme options are theme-specific and customize the look and feel of a theme
+# further.  For a list of options available for each theme, see the
+# documentation.
+#
+# html_theme_options = {}
+
+# Add any paths that contain custom themes here, relative to this directory.
+# html_theme_path = []
+
+# The name for this set of Sphinx documents.
+# "<project> v<release> documentation" by default.
+#
+# html_title = ''
+
+# A shorter title for the navigation bar.  Default is the same as html_title.
+#
+# html_short_title = None
+
+# The name of an image file (relative to this directory) to place at the top
+# of the sidebar.
+#
+# html_logo = None
+
+# The name of an image file (relative to this directory) to use as a favicon of
+# the docs.  This file should be a Windows icon file (.ico) being 16x16 or 32x32
+# pixels large.
+#
+# html_favicon = None
+
+# Add any paths that contain custom static files (such as style sheets) here,
+# relative to this directory. They are copied after the builtin static files,
+# so a file named "default.css" will overwrite the builtin "default.css".
+html_static_path = ['_static']
+
+# Add any extra paths that contain custom files (such as robots.txt or
+# .htaccess) here, relative to this directory. These files are copied
+# directly to the root of the documentation.
+#
+# html_extra_path = []
+
+# If not None, a 'Last updated on:' timestamp is inserted at every page
+# bottom, using the given strftime format.
+# The empty string is equivalent to '%b %d, %Y'.
+#
+# html_last_updated_fmt = None
+
+# If true, SmartyPants will be used to convert quotes and dashes to
+# typographically correct entities.
+#
+# html_use_smartypants = True
+
+# Custom sidebar templates, maps document names to template names.
+#
+# html_sidebars = {}
+
+# Additional templates that should be rendered to pages, maps page names to
+# template names.
+#
+# html_additional_pages = {}
+
+# If false, no module index is generated.
+#
+# html_domain_indices = True
+
+# If false, no index is generated.
+#
+# html_use_index = True
+
+# If true, the index is split into individual pages for each letter.
+#
+# html_split_index = False
+
+# If true, links to the reST sources are added to the pages.
+#
+# html_show_sourcelink = True
+
+# If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
+#
+# html_show_sphinx = True
+
+# If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
+#
+# html_show_copyright = True
+
+# If true, an OpenSearch description file will be output, and all pages will
+# contain a <link> tag referring to it.  The value of this option must be the
+# base URL from which the finished HTML is served.
+#
+# html_use_opensearch = ''
+
+# This is the file name suffix for HTML files (e.g. ".xhtml").
+# html_file_suffix = None
+
+# Language to be used for generating the HTML full-text search index.
+# Sphinx supports the following languages:
+#   'da', 'de', 'en', 'es', 'fi', 'fr', 'h', 'it', 'ja'
+#   'nl', 'no', 'pt', 'ro', 'r', 'sv', 'tr', 'zh'
+#
+# html_search_language = 'en'
+
+# A dictionary with options for the search language support, empty by default.
+# 'ja' uses this config value.
+# 'zh' user can custom change `jieba` dictionary path.
+#
+# html_search_options = {'type': 'default'}
+
+# The name of a javascript file (relative to the configuration directory) that
+# implements a search results scorer. If empty, the default will be used.
+#
+# html_search_scorer = 'scorer.js'
+man_pages = [
+        ('mpd.1', 'mpd', 'MPD documentation', [author], 1),
+        ('mpd.conf.5', 'mpd.conf', 'mpd.conf documentation', [author], 5)
+]

doc/developer.rst

@@ -0,0 +1,148 @@
+Developer's Manual
+##################
+
+Introduction
+************
+
+This is a guide for those who wish to hack on the MPD source code.  MPD is an open project, and we are always happy about contributions.  So far, more than 150 people have contributed patches. This document is work in progress.  Most of it may be incomplete yet.  Please help!
+
+Code Style
+**********
+
+* indent with tabs (width 8)
+* don't write CPP when you can write C++: use inline functions and constexpr instead of macros
+* comment your code, document your APIs
+* the code should be C++17 compliant, and must compile with :program:`GCC` 8 and :program:`clang` 5
+* all code must be exception-safe
+* classes and functions names use CamelCase; variables are lower-case with words separated by underscore
+
+Some example code:
+
+.. code-block:: c
+
+    Foo(const char *abc, int xyz)
+    {
+        if (abc == nullptr) {
+                LogWarning("Foo happened!");
+                return -1;
+        }
+
+        return xyz;
+    }
+
+
+Error handling
+==============
+
+If an error occurs, throw a C++ exception, preferably derived from
+:code:`std::runtime_error`.  The function's API documentation should
+mention that.  If a function cannot throw exceptions, add
+:code:`noexcept` to its prototype.
+
+Some parts of MPD use callbacks to report completion; the handler
+classes usually have an "error" callback which receives a
+:code:`std::exception_ptr`
+(e.g. :code:`BufferedSocket::OnSocketError()`).  Wrapping errors in
+:code:`std::exception_ptr` allows propagating details about the error
+across thread boundaries to the entity which is interested in handling
+it (e.g. giving the MPD client details about an I/O error caught by
+the decoder thread).
+
+Out-of-memory errors (i.e. :code:`std::bad_alloc`) do not need to be
+handled.  Some operating systems such as Linux do not report
+out-of-memory to userspace, and instead kill a process to recover.
+Even if we know we are out of memory, there is little we can do except
+for aborting the process quickly.  Any other attempts to give back
+memory may cause page faults on the way which make the situation
+worse.
+
+Error conditions which are caused by a bug do not need to be handled
+at runtime; instead, use :code:`assert()` to detect them in debug
+builds.
+
+
+git Branches
+************
+
+There are two active branches in the git repository:
+
+- the "unstable" branch called ``master`` where new features are
+  merged.  This will become the next major release eventually.
+- the "stable" branch (currently called ``v0.22.x``) where only bug
+  fixes are merged.
+
+Once :program:`MPD` 0.23 is released, a new branch called ``v0.23.x``
+will be created for 0.23 bug-fix releases; after that, ``v0.22.x``
+will eventually cease to be maintained.
+
+After bug fixes have been added to the "stable" branch, it will be
+merged into ``master``.  This ensures that all known bugs are fixed in
+all active branches.
+
+
+Hacking The Source
+******************
+
+MPD sources are managed in a git repository on
+`Github <https://github.com/MusicPlayerDaemon/>`_.
+
+Always write your code against the latest git:
+
+.. code-block:: none
+
+    git clone git://github.com/MusicPlayerDaemon/MPD
+
+If you already have a clone, update it:
+
+.. code-block:: none
+
+    git pull --rebase git://github.com/MusicPlayerDaemon/MPD master
+
+You can do without :code:`--rebase`, but we recommend that you rebase
+your repository on the "master" repository all the time.
+
+Configure with the option :code:`--werror`.  Enable as many plugins as
+possible, to be sure that you don't break any disabled code.
+
+Don't mix several changes in one single patch.  Create a separate patch for every change. Tools like :program:`stgit` help you with that. This way, we can review your patches more easily, and we can pick the patches we like most first.
+
+Basic stgit usage
+=================
+
+stgit allows you to create a set of patches and refine all of them: you can go back to any patch at any time, and re-edit it (both the code and the commit message). You can reorder patches and insert new patches at any position. It encourages creating separate patches for tiny changes.
+
+stgit needs to be initialized on a git repository:
+
+.. code-block:: sh
+
+    stg init
+
+Before you edit the code, create a patch:
+
+.. code-block:: sh
+
+    stg new my-patch-name
+
+stgit now asks you for the commit message.
+
+Now edit the code. Once you're finished, you have to "refresh" the patch, i.e. your edits are incorporated into the patch you have created:
+
+.. code-block:: sh
+
+    stg refresh
+
+You may now continue editing the same patch, and refresh it as often as you like. Create more patches, edit and refresh them.
+
+To view the list of patches, type stg series. To go back to a specific patch, type stg goto my-patch-name; now you can re-edit it (don't forget stg refresh when you're finished with that patch).
+
+When the whole patch series is finished, convert stgit patches to git commits:
+
+.. code-block:: sh
+
+    stg commit
+
+Submitting Patches
+******************
+
+Submit pull requests on GitHub:
+https://github.com/MusicPlayerDaemon/MPD/pulls

doc/developer.xml

@@ -1,231 +0,0 @@
-<?xml version='1.0' encoding="utf-8"?>
-<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-                      "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-
-<book>
-  <title>The Music Player Daemon - Developer's Manual</title>
-
-  <chapter id="introduction">
-    <title>Introduction</title>
-
-    <para>
-      This is a guide for those who wish to hack on the MPD source
-      code.  MPD is an open project, and we are always happy about
-      contributions.  So far, more than 150 people have contributed
-      patches.
-    </para>
-
-    <para>
-      This document is work in progress.  Most of it may be incomplete
-      yet.  Please help!
-    </para>
-  </chapter>
-
-  <chapter id="code_style">
-    <title>Code Style</title>
-
-    <itemizedlist>
-      <listitem>
-        <para>
-          indent with tabs (width 8)
-        </para>
-      </listitem>
-
-      <listitem>
-        <para>
-          don't write CPP when you can write C++: use inline
-          functions and constexpr instead of macros
-        </para>
-      </listitem>
-
-      <listitem>
-        <para>
-          comment your code, document your APIs
-        </para>
-      </listitem>
-
-      <listitem>
-        <para>
-          the code should be C++14 compliant, and must compile with
-          <application>GCC</application> 4.9 and
-          <application>clang</application> 3.4
-        </para>
-      </listitem>
-
-      <listitem>
-        <para>
-          report error conditions with C++ exceptions, preferable
-          derived from <varname>std::runtime_error</varname>
-        </para>
-      </listitem>
-
-      <listitem>
-        <para>
-          all code must be exception-safe
-        </para>
-      </listitem>
-
-      <listitem>
-        <para>
-          classes and functions names use CamelCase; variables are
-          lower-case with words separated by underscore
-        </para>
-      </listitem>
-
-      <listitem>
-        <para>
-          Some example code:
-        </para>
-
-        <programlisting lang="C">static inline int
-Foo(const char *abc, int xyz)
-{
-        if (abc == nullptr) {
-                LogWarning("Foo happened!");
-                return -1;
-        }
-
-        return xyz;
-}
-        </programlisting>
-      </listitem>
-    </itemizedlist>
-  </chapter>
-
-  <chapter id="hacking">
-    <title>Hacking The Source</title>
-
-    <para>
-      MPD sources are managed in a git repository on <ulink
-      url="https://github.com/MusicPlayerDaemon/">GitHub</ulink>.
-    </para>
-
-    <para>
-      Always write your code against the latest git:
-    </para>
-
-    <programlisting>git clone git://github.com/MusicPlayerDaemon/MPD</programlisting>
-
-    <para>
-      If you already have a clone, update it:
-    </para>
-
-    <programlisting>git pull --rebase git://github.com/MusicPlayerDaemon/MPD master</programlisting>
-
-    <para>
-      You can do without "--rebase", but we recommend that you rebase
-      your repository on the "master" repository all the time.
-    </para>
-
-    <para>
-      Configure with the options <option>--enable-debug
-      --enable-werror</option>.  Enable as many plugins as possible,
-      to be sure that you don't break any disabled code.
-    </para>
-
-    <para>
-      Don't mix several changes in one single patch.  Create a
-      separate patch for every change.  Tools like
-      <application>stgit</application> help you with that.  This way,
-      we can review your patches more easily, and we can pick the
-      patches we like most first.
-    </para>
-
-
-    <section>
-      <title> Basic stgit usage</title>
-
-      <para>
-        stgit allows you to create a set of patches and refine all of
-        them: you can go back to any patch at any time, and re-edit it
-        (both the code and the commit message). You can reorder
-        patches and insert new patches at any position. It encourages
-        creating separate patches for tiny changes.
-      </para>
-
-      <para>
-        stgit needs to be initialized on a git repository: stg init
-      </para>
-
-      <para>
-        Before you edit the code, create a patch: stg new
-        my-patch-name (stgit now asks you for the commit message).
-      </para>
-
-      <para>
-        Now edit the code. Once you're finished, you have to "refresh"
-        the patch, i.e. your edits are incorporated into the patch you
-        have created: stg refresh
-      </para>
-
-      <para>
-        You may now continue editing the same patch, and refresh it as
-        often as you like. Create more patches, edit and refresh them.
-      </para>
-
-      <para>
-        To view the list of patches, type stg series. To go back to a
-        specific patch, type stg goto my-patch-name; now you can
-        re-edit it (don't forget stg refresh when you're finished with
-        that patch).
-      </para>
-
-      <para>
-        When the whole patch series is finished, convert stgit patches
-        to git commits: stg commit
-      </para>
-    </section>
-  </chapter>
-
-  <chapter id="submitting_patches">
-    <title>Submitting Patches</title>
-
-    <para>
-      Send your patches to the mailing list:
-      <email>mpd-devel@musicpd.org</email> (<ulink
-      url="http://mailman.blarg.de/listinfo/mpd-devel">subscribe
-      here</ulink>)
-    </para>
-
-    <para>
-      <command>git pull</command> requests are preferred.
-    </para>
-  </chapter>
-
-  <chapter id="tools">
-    <title>Development Tools</title>
-
-    <section>
-      <title>Clang Static Analyzer</title>
-
-      <para>
-        The <ulink url="http://clang-analyzer.llvm.org/">clang static
-        analyzer</ulink> is a tool that helps find bugs.  To run it on
-        the MPD code base, install LLVM and clang.  Configure MPD to
-        use clang:
-      </para>
-
-      <programlisting>./configure --enable-debug CXX=clang++ CC=clang ...</programlisting>
-
-      <para>
-        It is recommended to use <option>--enable-debug</option>,
-        because the analyzer takes advantage of
-        <function>assert()</function> calls, which are only enabled in
-        the debug build.
-      </para>
-
-      <para>
-        Now run the analyzer:
-      </para>
-
-      <programlisting>scan-build --use-c++=clang++ --use-cc=clang make</programlisting>
-
-      <para>
-        The options <option>--use-c++</option> and
-        <option>--use-cc</option> are necessary because it invokes
-        <command>cc</command> for actually compiling the sources by
-        default.  That breaks, because MPD requires a C99 compiler.
-      </para>
-    </section>
-  </chapter>
-</book>

doc/include/tags.xml

@@ -1,156 +0,0 @@
-<?xml version='1.0' encoding="utf-8"?>
-<!DOCTYPE itemizedlist PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
-                              "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd">
-
-<itemizedlist>
-  <listitem>
-    <para>
-      <varname>artist</varname>: the artist name.  Its meaning is not
-      well-defined; see <varname>composer</varname> and
-      <varname>performer</varname> for more specific tags.
-    </para>
-  </listitem>
-
-  <listitem>
-    <para>
-      <varname>artistsort</varname>: same as
-      <varname>artist</varname>, but for sorting.  This usually omits
-      prefixes such as "The".
-    </para>
-  </listitem>
-
-  <listitem>
-    <para>
-      <varname>album</varname>: the album name.
-    </para>
-  </listitem>
-
-  <listitem>
-    <para>
-      <varname>albumsort</varname>: same as <varname>album</varname>,
-      but for sorting.
-    </para>
-  </listitem>
-
-  <listitem>
-    <para>
-      <varname>albumartist</varname>: on multi-artist albums, this is
-      the artist name which shall be used for the whole album.  The
-      exact meaning of this tag is not well-defined.
-    </para>
-  </listitem>
-
-  <listitem>
-    <para>
-      <varname>albumartistsort</varname>: same as
-      <varname>albumartist</varname>, but for sorting.
-    </para>
-  </listitem>
-
-  <listitem>
-    <para>
-      <varname>title</varname>: the song title.
-    </para>
-  </listitem>
-
-  <listitem>
-    <para>
-      <varname>track</varname>: the decimal track number within the
-      album.
-    </para>
-  </listitem>
-
-  <listitem>
-    <para>
-      <varname>name</varname>: a name for this song.  This is not the
-      song title.  The exact meaning of this tag is not well-defined.
-      It is often used by badly configured internet radio stations
-      with broken tags to squeeze both the artist name and the song
-      title in one tag.
-    </para>
-  </listitem>
-
-  <listitem>
-    <para>
-      <varname>genre</varname>: the music genre.
-    </para>
-  </listitem>
-
-  <listitem>
-    <para>
-      <varname>date</varname>: the song's release date.  This is
-      usually a 4-digit year.
-    </para>
-  </listitem>
-
-  <listitem>
-    <para>
-      <varname>composer</varname>: the artist who composed the song.
-    </para>
-  </listitem>
-
-  <listitem>
-    <para>
-      <varname>performer</varname>: the artist who performed the song.
-    </para>
-  </listitem>
-
-  <listitem>
-    <para>
-      <varname>comment</varname>: a human-readable comment about this
-      song.  The exact meaning of this tag is not well-defined.
-    </para>
-  </listitem>
-
-  <listitem>
-    <para>
-      <varname>disc</varname>: the decimal disc number in a multi-disc
-      album.
-    </para>
-  </listitem>
-
-  <listitem>
-    <para>
-      <varname>musicbrainz_artistid</varname>: the artist id in the
-      <ulink
-      url="https://picard.musicbrainz.org/docs/mappings/">MusicBrainz</ulink>
-      database.
-    </para>
-  </listitem>
-
-  <listitem>
-    <para>
-      <varname>musicbrainz_albumid</varname>: the album id in the
-      <ulink
-      url="https://picard.musicbrainz.org/docs/mappings/">MusicBrainz</ulink>
-      database.
-    </para>
-  </listitem>
-
-  <listitem>
-    <para>
-      <varname>musicbrainz_albumartistid</varname>: the album artist
-      id in the <ulink
-      url="https://picard.musicbrainz.org/docs/mappings/">MusicBrainz</ulink>
-      database.
-    </para>
-  </listitem>
-
-  <listitem>
-    <para>
-      <varname>musicbrainz_trackid</varname>: the track id in the
-      <ulink
-      url="https://picard.musicbrainz.org/docs/mappings/">MusicBrainz</ulink>
-      database.
-    </para>
-  </listitem>
-
-  <listitem>
-    <para>
-      <varname>musicbrainz_releasetrackid</varname>: the release track
-      id in the <ulink
-      url="https://picard.musicbrainz.org/docs/mappings/">MusicBrainz</ulink>
-      database.
-    </para>
-  </listitem>
-</itemizedlist>

doc/index.rst

@@ -0,0 +1,18 @@
+Music Player Daemon
+===================
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Contents:
+
+   user
+   plugins
+   developer
+   protocol
+
+
+Indices and tables
+==================
+
+* :ref:`genindex`
+* :ref:`search`

doc/meson.build

@@ -0,0 +1,51 @@
+if not get_option('html_manual') and not get_option('manpages')
+  subdir_done()
+endif
+
+sphinx = find_program('sphinx-build', required: get_option('documentation'))
+if not sphinx.found()
+  subdir_done()
+endif
+
+if get_option('html_manual')
+  sphinx_output = custom_target(
+    'HTML documentation',
+    output: 'html',
+    input: [
+      'index.rst', 'user.rst', 'developer.rst',
+      'plugins.rst',
+      'protocol.rst',
+      'conf.py',
+    ],
+    command: [sphinx, '-q', '-b', 'html', '-d', '@OUTDIR@/doctrees', meson.current_source_dir(), '@OUTPUT@'],
+    build_by_default: true,
+    install: true,
+    install_dir: join_paths(get_option('datadir'), 'doc', meson.project_name()),
+  )
+
+  custom_target(
+    'upload',
+    input: sphinx_output,
+    output: 'upload',
+    build_always_stale: true,
+    command: [
+      'rsync', '-vpruz', '--delete', meson.current_build_dir() + '/',
+      'www.musicpd.org:/var/www/mpd/doc/',
+      '--chmod=Dug+rwx,Do+rx,Fug+rw,Fo+r',
+      '--include=html', '--include=html/**',
+      '--exclude=*',
+    ],
+  )
+endif
+
+if get_option('manpages')
+  custom_target(
+    'Manpage documentation',
+    output: ['mpd.1', 'mpd.conf.5'],
+    input: ['mpd.1.rst', 'conf.py'],
+    command: [sphinx, '-q', '-b', 'man', '-d', '@OUTDIR@/man_doctrees', meson.current_source_dir(), '@OUTDIR@'],
+    build_by_default: true,
+    install: true,
+    install_dir: [join_paths(get_option('mandir'), 'man1'), join_paths(get_option('mandir'), 'man5')],
+  )
+endif

doc/mpd.1

@@ -1,55 +0,0 @@
-.TH "Music Player Daemon" 1
-.SH NAME
-MPD \- A daemon for playing music
-.SH SYNOPSIS
-.B mpd
-.RI [ options ]
-.RI [ CONF_FILE ]
-.SH DESCRIPTION
-MPD is a daemon for playing music.  Music is played through the configured
-audio output(s) (which are generally local, but can be remote).  The daemon
-stores info about all available music, and this info can be easily searched and
-retrieved.  Player control, info retrieval, and playlist management can all be
-managed remotely.
-
-MPD searches for a config file in \fB$XDG_CONFIG_HOME/mpd/mpd.conf\fP then
-\fB~/.mpdconf\fP then \fB/etc/mpd.conf\fP or uses CONF_FILE.
-
-Read more about MPD at <\fBhttp://www.musicpd.org/\fP>.
-.SH OPTIONS
-.TP
-.BI \-\-help
-Output a brief help message.
-.TP
-.BI \-\-kill
-Kill the currently running mpd session.  The pid_file parameter must be
-specified in the config file for this to work.
-.TP
-.BI \-\-no\-daemon
-Don't detach from console.
-.TP
-.BI \-\-stderr
-Print messages stderr.
-.TP
-.BI \-\-verbose
-Verbose logging.
-.TP
-.BI \-\-version
-Print version information.
-.SH FILES
-.TP
-.BI ~/.mpdconf
-User configuration file.
-.TP
-.BI /etc/mpd.conf
-Global configuration file.
-.SH SEE ALSO
-mpd.conf(5), mpc(1)
-.SH BUGS
-If you find a bug, please report it at
-.br
-<\fBhttps://github.com/MusicPlayerDaemon/MPD/issues/\fP>.
-.SH AUTHORS
-Max Kellermann <max.kellermann@gmail.com>
-
-Special thanks to all the people that provided feedback and patches.

doc/mpd.1.rst

@@ -0,0 +1,69 @@
+===
+mpd
+===
+
+SYNOPSIS
+--------
+
+``mpd`` [options] [CONF_FILE]
+
+DESCRIPTION
+------------
+
+MPD is a daemon for playing music. Music is played through the configured audio output(s) (which are generally local, but can be remote). The daemon stores info about all available music, and this info can be easily searched and retrieved. Player control, info retrieval, and playlist management can all be managed remotely.
+
+MPD searches for a config file in ``$XDG_CONFIG_HOME/mpd/mpd.conf``
+then ``~/.mpdconf`` then ``~/.mpd/mpd.conf`` then ``/etc/mpd.conf`` or uses ``CONF_FILE``.
+
+Read more about MPD at http://www.musicpd.org/
+
+OPTIONS
+-------
+
+.. program:: mpd
+
+.. option:: --help
+
+  Output a brief help message.
+
+.. option:: --kill
+
+  Kill the currently running mpd session. The pid_file parameter must be specified in the config file for this to work.
+
+.. option:: --no-config
+
+  Don't read from the configuration file.
+
+.. option:: --no-daemon
+
+  Don't detach from console.
+
+.. option:: --stderr
+
+  Print messages to stderr.
+
+.. option:: --verbose
+
+  Verbose logging.
+
+.. option:: --version
+
+  Print version information.
+
+FILES
+-----
+
+:file:`$XDG_CONFIG_HOME/mpd/mpd.conf`
+  User configuration file (usually :file:`~/.config/mpd/mpd.conf`).
+
+:file:`/etc/mpd.conf`
+  Global configuration file.
+
+SEE ALSO
+--------
+
+:manpage:`mpd.conf(5)`, :manpage:`mpc(1)`
+
+BUGS
+----
+If you find a bug, please report it at https://github.com/MusicPlayerDaemon/MPD/issues/

doc/mpd.conf.5

@@ -1,262 +0,0 @@
-.TH mpd.conf 5
-.SH NAME
-mpd.conf \- Music Player Daemon configuration file
-.SH DESCRIPTION
-\fBmpd.conf\fP is the configuration file for mpd(1).  If not specified on the
-command line, MPD first searches for it at \fB$XDG_CONFIG_HOME/mpd/mpd.conf\fP
-then at \fB~/.mpdconf\fP then at \fB~/.mpd/mpd.conf\fP and then in
-\fB/etc/mpd.conf\fP.
-
-Lines beginning with a "#" character are comments.  All other non-empty lines
-specify parameters and their values.  These lines contain the parameter name
-and parameter value (surrounded by double quotes) separated by whitespace
-(either tabs or spaces).  For example:
-
-parameter "value"
-
-The exception to this rule is the audio_output parameter, which is of the form:
-
-audio_output {
-.br
-        parameter1 "value"
-        parameter2 "value"
-.br
-}
-
-Parameters that take a file or directory as an argument should use absolute
-paths.
-
-See \fBdocs/mpdconf.example\fP in the source tarball for an example
-configuration file.
-
-This manual is not complete, it lists only the most important options.
-Please read the MPD user manual for a complete configuration guide:
-<\fBhttp://www.musicpd.org/doc/user/\fP>
-.SH REQUIRED PARAMETERS
-.TP
-.B db_file <file>
-This specifies where the db file will be stored.
-.TP
-.B log_file <file>
-This specifies where the log file should be located.
-The special value "syslog" makes MPD use the local syslog daemon.
-.SH OPTIONAL PARAMETERS
-.TP
-.B sticker_file <file>
-The location of the sticker database.  This is a database which
-manages dynamic information attached to songs.
-.TP
-.B pid_file <file>
-This specifies the file to save mpd's process ID in.
-.TP
-.B music_directory <directory>
-This specifies the directory where music is located.
-If you do not configure this, you can only play streams.
-.TP
-.B playlist_directory <directory>
-This specifies the directory where saved playlists are stored.
-If you do not configure this, you cannot save playlists.
-.TP
-.B state_file <file>
-This specifies if a state file is used and where it is located.  The state of
-mpd will be saved to this file when mpd is terminated by a TERM signal or by
-the "kill" command.  When mpd is restarted, it will read the state file and
-restore the state of mpd (including the playlist).
-.TP
-.B restore_paused <yes or no>
-Put MPD into pause mode instead of starting playback after startup.
-.TP
-.B user <username>
-This specifies the user that MPD will run as, if set.  MPD should
-never run as root, and you may use this option to make MPD change its
-user id after initialization.  Do not use this option if you start MPD
-as an unprivileged user.
-.TP
-.B bind_to_address <ip address or hostname or any>
-This specifies which address mpd binds to and listens on.  Multiple
-bind_to_address parameters may be specified.  The default is "any", which binds
-to all available addresses.
-
-You can set a port that is different from the global port setting,
-e.g. "localhost:6602".  IPv6 addresses must be enclosed in square
-brackets if you want to configure a port, e.g. "[::1]:6602".
-
-To bind to a Unix domain socket, specify an absolute path or a path starting
-with a tilde (~).  For a system-wide MPD, we suggest the path
-"\fB/var/run/mpd/socket\fP".
-.TP
-.B port <port>
-This specifies the port that mpd listens on.  The default is 6600.
-.TP
-.B log_level <default, secure, or verbose>
-This specifies how verbose logs are.  "default" is minimal logging, "secure"
-reports from what address a connection is opened, and when it is closed, and
-"verbose" records excessive amounts of information for debugging purposes.  The
-default is "default".
-.TP
-.B follow_outside_symlinks <yes or no>
-Control if MPD will follow symbolic links pointing outside the music dir.
-You must recreate the database after changing this option.
-The default is "yes".
-.TP
-.B follow_inside_symlinks <yes or no>
-Control if MPD will follow symbolic links pointing inside the music dir,
-potentially adding duplicates to the database.
-You must recreate the database after changing this option.
-The default is "yes".
-.TP
-.B zeroconf_enabled <yes or no>
-If yes, and MPD has been compiled with support for Avahi or Bonjour, service
-information will be published with Zeroconf.  The default is yes.
-.TP
-.B zeroconf_name <name>
-If Zeroconf is enabled, this is the service name to publish.  This name should
-be unique to your local network, but name collisions will be properly dealt
-with.  The default is "Music Player".
-.TP
-.B password <password@permissions>
-This specifies a password for access to mpd.  The format is
-"password@permissions" where permissions is a comma delimited list composed
-of "read", "add", "control", and/or "admin".  "read" allows for reading of the
-database, displaying the current playlist, and current status of mpd.  "add"
-allows for adding songs and loading playlists.  "control" allows for all other
-player and playlist manipulations.  "admin" allows the db to be updated and for
-the client to kill mpd.  An example value is "somePassword@read,add".  Multiple
-password parameters may be specified.
-.TP
-.B default_permissions <permissions>
-This specifies the permissions of a client that has not been authenticated
-using a password.  The format of permissions is specified in the description of
-the "password" config parameter.  If no passwords are specified, the default is
-"read,add,control,admin", otherwise it is "" (no permissions).
-.TP
-.B audio_output
-See \fBDESCRIPTION\fP and the various \fBAUDIO OUTPUT PARAMETERS\fP sections
-for the format of this parameter.  Multiple audio_output sections may be
-specified.  If no audio_output section is specified, then MPD will scan for a
-usable audio output.
-.TP
-.B replaygain <off or album or track or auto>
-If specified, mpd will adjust the volume of songs played using ReplayGain tags
-(see <\fBhttp://www.replaygain.org/\fP>).  Setting this to "album" will adjust
-volume using the album's ReplayGain tags, while setting it to "track" will
-adjust it using the track ReplayGain tags.  "auto" uses the track ReplayGain
-tags if random play is activated otherwise the album ReplayGain tags. Currently
-only FLAC, Ogg Vorbis, Musepack, and MP3 (through ID3v2 ReplayGain tags, not
-APEv2) are supported.
-.TP
-.B replaygain_preamp <\-15 to 15>
-This is the gain (in dB) applied to songs with ReplayGain tags.
-.TP
-.B volume_normalization <yes or no>
-If yes, mpd will normalize the volume of songs as they play.  The default is no.
-.TP
-.B filesystem_charset <charset>
-This specifies the character set used for the filesystem.  A list of supported
-character sets can be obtained by running "iconv \-l".  The default is
-determined from the locale when the db was originally created.
-.TP
-.B gapless_mp3_playback <yes or no>
-This specifies whether to support gapless playback of MP3s which have the
-necessary headers.  Useful if your MP3s have headers with incorrect
-information.  If you have such MP3s, it is highly recommended that you fix them
-using vbrfix (available from <http://www.willwap.co.uk/Programs/vbrfix.php>)
-instead of disabling gapless MP3 playback.  The default is to support gapless
-MP3 playback.
-.TP
-.B save_absolute_paths_in_playlists <yes or no>
-This specifies whether relative or absolute paths for song filenames are used
-when saving playlists.  The default is "no".
-.TP
-.B auto_update <yes or no>
-This specifies the whether to support automatic update of music database when
-files are changed in music_directory. The default is to disable autoupdate
-of database.
-.TP
-.B auto_update_depth <N>
-Limit the depth of the directories being watched, 0 means only watch
-the music directory itself.  There is no limit by default.
-.TP
-.SH REQUIRED AUDIO OUTPUT PARAMETERS
-.TP
-.B type <type>
-This specifies the audio output type.  See the list of supported outputs in mpd
-\-\-version for possible values.
-.TP
-.B name <name>
-This specifies a unique name for the audio output.
-.SH OPTIONAL AUDIO OUTPUT PARAMETERS
-.TP
-.B format <sample_rate:bits:channels>
-This specifies the sample rate, bits per sample, and number of channels of
-audio that is sent to the audio output device.  See documentation for the
-\fBaudio_output_format\fP parameter for more details.  The default is to use
-whatever audio format is passed to the audio output.
-Any of the three attributes may be an asterisk to specify that this
-attribute should not be enforced
-.TP
-.B replay_gain_handler <software, mixer or none>
-Specifies how replay gain is applied.  The default is "software",
-which uses an internal software volume control.  "mixer" uses the
-configured (hardware) mixer control.  "none" disables replay gain on
-this audio output.
-.SH OPTIONAL ALSA OUTPUT PARAMETERS
-.TP
-.B device <dev>
-This specifies the device to use for audio output.  The default is "default".
-.TP
-.B mixer_type <hardware, software or none>
-Specifies which mixer should be used for this audio output: the
-hardware mixer (available for ALSA, OSS and PulseAudio), the software
-mixer or no mixer ("none").  By default, the hardware mixer is used
-for devices which support it, and none for the others.
-.TP
-.B mixer_device <mixer dev>
-This specifies which mixer to use.  The default is "default".  To use
-the second sound card in a system, use "hw:1".
-.TP
-.B mixer_control <mixer ctrl>
-This specifies which mixer control to use (sometimes referred to as
-the "device").  The default is "PCM".  Use "amixer scontrols" to see
-the list of possible controls.
-.TP
-.B mixer_index <mixer index>
-A number identifying the index of the named mixer control.  This is
-probably only useful if your alsa device has more than one
-identically\-named mixer control.  The default is "0".  Use "amixer
-scontrols" to see the list of controls with their indexes.
-.TP
-.B auto_resample <yes or no>
-Setting this to "no" disables ALSA's software resampling, if the
-hardware does not support a specific sample rate.  This lets MPD do
-the resampling.  "yes" is the default and allows ALSA to resample.
-.TP
-.B auto_channels <yes or no>
-Setting this to "no" disables ALSA's channel conversion, if the
-hardware does not support a specific number of channels.  Default: "yes".
-.TP
-.B auto_format <yes or no>
-Setting this to "no" disables ALSA's sample format conversion, if the
-hardware does not support a specific sample format.  Default: "yes".
-.TP
-.B buffer_time <time in microseconds>
-This sets the length of the hardware sample buffer in microseconds.  Increasing
-it may help to reduce or eliminate skipping on certain setups.  Most users do
-not need to change this.  The default is 500000 microseconds (0.5 seconds).
-.TP
-.B period_time <time in microseconds>
-This sets the time between hardware sample transfers in microseconds.
-Increasing this can reduce CPU usage while lowering it can reduce underrun
-errors on bandwidth-limited devices.  Some users have reported good results
-with this set to 50000, but not all devices support values this high.  Most
-users do not need to change this.  The default is 256000000 / sample_rate(kHz),
-or 5804 microseconds for CD-quality audio.
-.SH FILES
-.TP
-.BI ~/.mpdconf
-User configuration file.
-.TP
-.BI /etc/mpd.conf
-Global configuration file.
-.SH SEE ALSO
-mpd(1), mpc(1)

doc/mpd.conf.5.rst

@@ -0,0 +1,210 @@
+========
+mpd.conf
+========
+
+
+DESCRIPTION
+------------
+
+:file:`mpd.conf` is the configuration file for :manpage:`mpd(1)`. If
+not specified on the command line, MPD first searches for it at
+:file:`$XDG_CONFIG_HOME/mpd/mpd.conf` then at :file:`~/.mpdconf` then
+at :file:`~/.mpd/mpd.conf` and then in :file:`/etc/mpd.conf`.
+
+Each line in the configuration file contains a setting name and its value, e.g.:
+
+:code:`connection_timeout "5"`
+
+For settings which specify a filesystem path, the tilde is expanded:
+
+:code:`music_directory "~/Music"`
+
+Some of the settings are grouped in blocks with curly braces, e.g. per-plugin settings:
+
+.. code-block:: none
+
+   audio_output {
+       type "alsa"
+       name "My ALSA output"
+       device "iec958:CARD=Intel,DEV=0"
+       mixer_control "PCM"
+   }
+
+The :code:`include` directive can be used to include settings from
+another file; the given file name is relative to the current file:
+
+:code:`include "other.conf"`
+
+You can use include_optional instead if you want the included file to be
+optional; the directive will be ignored if the file does not exist:
+
+:code:`include_optional "may_not_exist.conf"`
+
+See :file:`docs/mpdconf.example` in the source tarball for an example
+configuration file.
+
+This manual is not complete, it lists only the most important options.
+Please read the MPD user manual for a complete configuration guide:
+http://www.musicpd.org/doc/user/
+
+
+OPTIONAL PARAMETERS
+-------------------
+
+db_file <file>
+   This specifies where the db file will be stored.
+
+log_file <file>
+   This specifies where the log file should be located. The special value "syslog" makes MPD use the local syslog daemon.
+
+sticker_file <file>
+   The location of the sticker database. This is a database which manages
+   dynamic information attached to songs.
+
+pid_file <file>
+   This specifies the file to save mpd's process ID in.
+
+music_directory <directory>
+   This specifies the directory where music is located. If you do not configure
+   this, you can only play streams.
+
+playlist_directory <directory>
+   This specifies the directory where saved playlists are stored. If
+   you do not configure this, you cannot save playlists.
+
+state_file <file>
+   This specifies if a state file is used and where it is located. The state of
+   mpd will be saved to this file when mpd is terminated by a TERM signal or by
+   the :program:`kill` command. When mpd is restarted, it will read the state file and
+   restore the state of mpd (including the playlist).
+
+restore_paused <yes or no>
+   Put MPD into pause mode instead of starting playback after startup.
+
+user <username>
+   This specifies the user that MPD will run as, if set. MPD should never run
+   as root, and you may use this option to make MPD change its user id after
+   initialization. Do not use this option if you start MPD as an unprivileged
+   user.
+
+port <port>
+   This specifies the port that mpd listens on. The default is 6600.
+
+log_level <level>
+   Suppress all messages below the given threshold.  The following
+   log levels are available:
+
+   - :samp:`error`: errors
+   - :samp:`warning`: warnings
+   - :samp:`notice`: interesting informational messages
+   - :samp:`info`: unimportant informational messages
+   - :samp:`verbose`: debug messages (for developers and for
+     troubleshooting)
+
+   The default is :samp:`notice`.
+
+follow_outside_symlinks <yes or no>
+  Control if MPD will follow symbolic links pointing outside the music dir. You
+  must recreate the database after changing this option. The default is "yes".
+
+follow_inside_symlinks <yes or no>
+  Control if MPD will follow symbolic links pointing inside the music dir,
+  potentially adding duplicates to the database. You must recreate the
+  database after changing this option. The default is "yes".
+
+zeroconf_enabled <yes or no>
+  If yes, and MPD has been compiled with support for Avahi or Bonjour, service
+  information will be published with Zeroconf. The default is yes.
+
+zeroconf_name <name>
+  If Zeroconf is enabled, this is the service name to publish. This name should
+  be unique to your local network, but name collisions will be properly dealt
+  with. The default is "Music Player @ %h", where %h will be replaced with the
+  hostname of the machine running MPD.
+
+audio_output
+  See DESCRIPTION and the various ``AUDIO OUTPUT PARAMETERS`` sections for the
+  format of this parameter. Multiple audio_output sections may be specified. If
+  no audio_output section is specified, then MPD will scan for a usable audio
+  output.
+
+replaygain <off or album or track or auto>
+  If specified, mpd will adjust the volume of songs played using ReplayGain
+  tags (see https://wiki.hydrogenaud.io/index.php?title=Replaygain).
+  Setting this to "album" will
+  adjust volume using the album's ReplayGain tags, while setting it to "track"
+  will adjust it using the track ReplayGain tags. "auto" uses the track
+  ReplayGain tags if random play is activated otherwise the album ReplayGain
+  tags. Currently only FLAC, Ogg Vorbis, Musepack, and MP3 (through ID3v2
+  ReplayGain tags, not APEv2) are supported.
+
+replaygain_preamp <-15 to 15>
+  This is the gain (in dB) applied to songs with ReplayGain tags.
+
+volume_normalization <yes or no>
+  If yes, mpd will normalize the volume of songs as they play. The default is
+  no.
+
+filesystem_charset <charset>
+  This specifies the character set used for the filesystem. A list of supported
+  character sets can be obtained by running "iconv -l". The default is
+  determined from the locale when the db was originally created.
+
+save_absolute_paths_in_playlists <yes or no>
+  This specifies whether relative or absolute paths for song filenames are used
+  when saving playlists. The default is "no".
+
+auto_update <yes or no>
+  This specifies the whether to support automatic update of music database
+  when files are changed in music_directory. The default is to disable
+  autoupdate of database.
+
+auto_update_depth <N>
+  Limit the depth of the directories being watched, 0 means only watch the
+  music directory itself. There is no limit by default.
+
+REQUIRED AUDIO OUTPUT PARAMETERS
+--------------------------------
+
+type <type>
+  This specifies the audio output type. See the list of supported outputs in
+  ``mpd --version`` for possible values.
+
+name <name>
+  This specifies a unique name for the audio output.
+
+OPTIONAL AUDIO OUTPUT PARAMETERS
+--------------------------------
+
+format <sample_rate:bits:channels>
+  This specifies the sample rate, bits per sample, and number of channels of
+  audio that is sent to the audio output device. See documentation for the
+  ``audio_output_format`` parameter for more details. The default is to use
+  whatever audio format is passed to the audio output. Any of the three
+  attributes may be an asterisk to specify that this attribute should not be
+  enforced
+
+replay_gain_handler <software, mixer or none>
+  Specifies how replay gain is applied. The default is "software", which uses
+  an internal software volume control. "mixer" uses the configured (hardware)
+  mixer control. "none" disables replay gain on this audio output.
+
+mixer_type <hardware, software or none>
+  Specifies which mixer should be used for this audio output: the hardware
+  mixer (available for ALSA, OSS and PulseAudio), the software mixer or no
+  mixer ("none"). By default, the hardware mixer is used for devices which
+  support it, and none for the others.
+
+FILES
+-----
+
+:file:`$XDG_CONFIG_HOME/mpd/mpd.conf`
+  User configuration file (usually :file:`~/.config/mpd/mpd.conf`).
+
+:file:`/etc/mpd.conf`
+  Global configuration file.
+
+SEE ALSO
+--------
+
+:manpage:`mpd(1)`, :manpage:`mpc(1)`

doc/mpdconf.example

@@ -5,7 +5,7 @@
 # Files and directories #######################################################
 #
 # This setting controls the top directory which MPD will search to discover the
-# available audio files and add them to the daemon's online database. This 
+# available audio files and add them to the daemon's online database. This
 # setting defaults to the XDG directory, otherwise the music directory will be
 # be disabled and audio files will only be accepted over ipc socket (using
 # file:// protocol) or streaming files over an accepted protocol.
@@ -13,26 +13,26 @@
 #music_directory		"~/music"
 #
 # This setting sets the MPD internal playlist directory. The purpose of this
-# directory is storage for playlists created by MPD. The server will use 
+# directory is storage for playlists created by MPD. The server will use
 # playlist files not created by the server but only if they are in the MPD
 # format. This setting defaults to playlist saving being disabled.
 #
 #playlist_directory		"~/.mpd/playlists"
 #
 # This setting sets the location of the MPD database. This file is used to
-# load the database at server start up and store the database while the 
+# load the database at server start up and store the database while the
 # server is not up. This setting defaults to disabled which will allow
 # MPD to accept files over ipc socket (using file:// protocol) or streaming
 # files over an accepted protocol.
 #
 #db_file			"~/.mpd/database"
-# 
+#
 # These settings are the locations for the daemon log files for the daemon.
 # These logs are great for troubleshooting, depending on your log_level
 # settings.
 #
 # The special value "syslog" makes MPD use the local syslog daemon. This
-# setting defaults to logging to syslog, otherwise logging is disabled.
+# setting defaults to logging to syslog.
 #
 #log_file			"~/.mpd/log"
 #
@@ -44,7 +44,7 @@
 #
 # This setting sets the location of the file which contains information about
 # most variables to get MPD back into the same general shape it was in before
-# it was brought down. This setting is disabled by default and the server 
+# it was brought down. This setting is disabled by default and the server
 # state will be reset on server start up.
 #
 #state_file			"~/.mpd/state"
@@ -74,7 +74,7 @@
 #group				"nogroup"
 #
 # This setting sets the address for the daemon to listen on. Careful attention
-# should be paid if this is assigned to anything other then the default, any.
+# should be paid if this is assigned to anything other than the default, any.
 # This setting can deny access to control of the daemon. Not effective if
 # systemd socket activiation is in use.
 #
@@ -89,20 +89,11 @@
 #
 #port				"6600"
 #
-# This setting controls the type of information which is logged. Available 
-# setting arguments are "default", "secure" or "verbose". The "verbose" setting
-# argument is recommended for troubleshooting, though can quickly stretch
-# available resources on limited hardware storage.
+# Suppress all messages below the given threshold.  Use "verbose" for
+# troubleshooting. Available setting arguments are "notice", "info", "verbose",
+# "warning" and "error".
 #
-#log_level			"default"
-#
-# If you have a problem with your MP3s ending abruptly it is recommended that 
-# you set this argument to "no" to attempt to fix the problem. If this solves
-# the problem, it is highly recommended to fix the MP3 files with vbrfix
-# (available from <http://www.willwap.co.uk/Programs/vbrfix.php>), at which
-# point gapless MP3 playback can be enabled.
-#
-#gapless_mp3_playback			"yes"
+#log_level			"notice"
 #
 # Setting "restore_paused" to "yes" puts MPD into pause mode instead
 # of starting playback after startup.
@@ -119,7 +110,11 @@
 # found in the user manual.
 #metadata_to_use	"artist,album,title,track,name,genre,date,composer,performer,disc"
 #
-# This setting enables automatic update of MPD's database when files in 
+# This example just enables the "comment" tag without disabling all
+# the other supported tags:
+#metadata_to_use "+comment"
+#
+# This setting enables automatic update of MPD's database when files in
 # music_directory are changed.
 #
 #auto_update	"yes"
@@ -134,7 +129,7 @@
 
 # Symbolic link behavior ######################################################
 #
-# If this setting is set to "yes", MPD will discover audio files by following 
+# If this setting is set to "yes", MPD will discover audio files by following
 # symbolic links outside of the configured music_directory.
 #
 #follow_outside_symlinks	"yes"
@@ -155,9 +150,9 @@
 #zeroconf_enabled		"yes"
 #
 # The argument to this setting will be the Zeroconf / Avahi unique name for
-# this MPD server on the network.
+# this MPD server on the network. %h will be replaced with the hostname.
 #
-#zeroconf_name			"Music Player"
+#zeroconf_name			"Music Player @ %h"
 #
 ###############################################################################
 
@@ -169,7 +164,7 @@
 #
 #password                        "password@read,add,control,admin"
 #
-# This setting specifies the permissions a user has who has not yet logged in. 
+# This setting specifies the permissions a user has who has not yet logged in.
 #
 #default_permissions             "read,add,control,admin"
 #
@@ -178,7 +173,18 @@
 
 # Database #######################################################################
 #
-
+# An example of a database section instead of the old 'db_file' setting.
+# It enables mounting other storages into the music directory.
+#
+#database {
+#       plugin "simple"
+#       path "~/.local/share/mpd/db
+#       cache_directory "~/.local/share/mpd/cache"
+#}
+#
+# An example of database config for a sattelite setup
+#
+#music_directory "nfs://fileserver.local/srv/mp3"
 #database {
 #       plugin "proxy"
 #       host "other.mpd.host"
@@ -187,7 +193,6 @@
 
 # Input #######################################################################
 #
-
 input {
         plugin "curl"
 #       proxy "proxy.isp.com:8080"
@@ -200,8 +205,8 @@ input {
 
 # Audio Output ################################################################
 #
-# MPD supports various audio output types, as well as playing through multiple 
-# audio outputs at the same time, through multiple audio_output settings 
+# MPD supports various audio output types, as well as playing through multiple
+# audio outputs at the same time, through multiple audio_output settings
 # blocks. Setting this block is optional, though the server will only attempt
 # autodetection for one sound card.
 #
@@ -284,6 +289,7 @@ input {
 #	name		"My Pulse Output"
 ##	server		"remote_server"		# optional
 ##	sink		"remote_server_sink"	# optional
+##	media_role	"media_role"		#optional
 #}
 #
 # An example of a winmm output (Windows multimedia API).
@@ -297,6 +303,20 @@ input {
 ##	mixer_type	"hardware"	# optional
 #}
 #
+# An example of a wasapi output (Windows multimedia API).
+#
+#audio_output {
+#	type		"wasapi"
+#	name		"My WASAPI output"
+##	device		"Digital Audio (S/PDIF) (High Definition Audio Device)" # optional
+#		or
+##	device		"0"		# optional
+## Exclusive mode blocks all other audio source, and get best audio quality without resampling.
+##	exclusive	"no"		# optional
+## Enumerate all devices in log.
+##	enumerate	"no"		# optional
+#}
+#
 # An example of an openal output.
 #
 #audio_output {
@@ -310,7 +330,7 @@ input {
 #audio_output {
 #	type		"sndio"
 #	name		"sndio output"
-#	mixer_type	"software"
+#	mixer_type	"hardware"
 #}
 #
 # An example of an OS X output:
@@ -352,7 +372,8 @@ input {
 # the argument "off", "album", "track" or "auto". "auto" is a special mode that
 # chooses between "track" and "album" depending on the current state of
 # random playback. If random playback is enabled then "track" mode is used.
-# See <http://www.replaygain.org> for more details about ReplayGain.
+# See <https://wiki.hydrogenaud.io/index.php?title=Replaygain> for
+# more details about ReplayGain.
 # This setting is off by default.
 #
 #replaygain			"album"
@@ -377,7 +398,7 @@ input {
 #replaygain_limit		"yes"
 #
 # This setting enables on-the-fly normalization volume adjustment. This will
-# result in the volume of all playing audio to be adjusted so the output has 
+# result in the volume of all playing audio to be adjusted so the output has
 # equal "loudness". This setting is disabled by default.
 #
 #volume_normalization		"no"
@@ -386,7 +407,7 @@ input {
 
 # Character Encoding ##########################################################
 #
-# If file or directory names do not display correctly for your locale then you 
+# If file or directory names do not display correctly for your locale then you
 # may need to modify this setting.
 #
 #filesystem_charset		"UTF-8"

m4/ax_append_compile_flags.m4

@@ -1,67 +0,0 @@
-# ===========================================================================
-#  http://www.gnu.org/software/autoconf-archive/ax_append_compile_flags.html
-# ===========================================================================
-#
-# SYNOPSIS
-#
-#   AX_APPEND_COMPILE_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS], [INPUT])
-#
-# DESCRIPTION
-#
-#   For every FLAG1, FLAG2 it is checked whether the compiler works with the
-#   flag.  If it does, the flag is added FLAGS-VARIABLE
-#
-#   If FLAGS-VARIABLE is not specified, the current language's flags (e.g.
-#   CFLAGS) is used.  During the check the flag is always added to the
-#   current language's flags.
-#
-#   If EXTRA-FLAGS is defined, it is added to the current language's default
-#   flags (e.g. CFLAGS) when the check is done.  The check is thus made with
-#   the flags: "CFLAGS EXTRA-FLAGS FLAG".  This can for example be used to
-#   force the compiler to issue an error when a bad flag is given.
-#
-#   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
-#
-#   NOTE: This macro depends on the AX_APPEND_FLAG and
-#   AX_CHECK_COMPILE_FLAG. Please keep this macro in sync with
-#   AX_APPEND_LINK_FLAGS.
-#
-# LICENSE
-#
-#   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
-#
-#   This program is free software: you can redistribute it and/or modify it
-#   under the terms of the GNU General Public License as published by the
-#   Free Software Foundation, either version 3 of the License, or (at your
-#   option) any later version.
-#
-#   This program is distributed in the hope that it will be useful, but
-#   WITHOUT ANY WARRANTY; without even the implied warranty of
-#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
-#   Public License for more details.
-#
-#   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
-#
-#   As a special exception, the respective Autoconf Macro's copyright owner
-#   gives unlimited permission to copy, distribute and modify the configure
-#   scripts that are the output of Autoconf when processing the Macro. You
-#   need not follow the terms of the GNU General Public License when using
-#   or distributing such scripts, even though portions of the text of the
-#   Macro appear in them. The GNU General Public License (GPL) does govern
-#   all other use of the material that constitutes the Autoconf Macro.
-#
-#   This special exception to the GPL applies to versions of the Autoconf
-#   Macro released by the Autoconf Archive. When you make and distribute a
-#   modified version of the Autoconf Macro, you may extend this special
-#   exception to the GPL to apply to your modified version as well.
-
-#serial 5
-
-AC_DEFUN([AX_APPEND_COMPILE_FLAGS],
-[AX_REQUIRE_DEFINED([AX_CHECK_COMPILE_FLAG])
-AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
-for flag in $1; do
-  AX_CHECK_COMPILE_FLAG([$flag], [AX_APPEND_FLAG([$flag], [$2])], [], [$3], [$4])
-done
-])dnl AX_APPEND_COMPILE_FLAGS

m4/ax_append_flag.m4

@@ -1,71 +0,0 @@
-# ===========================================================================
-#      http://www.gnu.org/software/autoconf-archive/ax_append_flag.html
-# ===========================================================================
-#
-# SYNOPSIS
-#
-#   AX_APPEND_FLAG(FLAG, [FLAGS-VARIABLE])
-#
-# DESCRIPTION
-#
-#   FLAG is appended to the FLAGS-VARIABLE shell variable, with a space
-#   added in between.
-#
-#   If FLAGS-VARIABLE is not specified, the current language's flags (e.g.
-#   CFLAGS) is used.  FLAGS-VARIABLE is not changed if it already contains
-#   FLAG.  If FLAGS-VARIABLE is unset in the shell, it is set to exactly
-#   FLAG.
-#
-#   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION.
-#
-# LICENSE
-#
-#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
-#   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
-#
-#   This program is free software: you can redistribute it and/or modify it
-#   under the terms of the GNU General Public License as published by the
-#   Free Software Foundation, either version 3 of the License, or (at your
-#   option) any later version.
-#
-#   This program is distributed in the hope that it will be useful, but
-#   WITHOUT ANY WARRANTY; without even the implied warranty of
-#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
-#   Public License for more details.
-#
-#   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
-#
-#   As a special exception, the respective Autoconf Macro's copyright owner
-#   gives unlimited permission to copy, distribute and modify the configure
-#   scripts that are the output of Autoconf when processing the Macro. You
-#   need not follow the terms of the GNU General Public License when using
-#   or distributing such scripts, even though portions of the text of the
-#   Macro appear in them. The GNU General Public License (GPL) does govern
-#   all other use of the material that constitutes the Autoconf Macro.
-#
-#   This special exception to the GPL applies to versions of the Autoconf
-#   Macro released by the Autoconf Archive. When you make and distribute a
-#   modified version of the Autoconf Macro, you may extend this special
-#   exception to the GPL to apply to your modified version as well.
-
-#serial 6
-
-AC_DEFUN([AX_APPEND_FLAG],
-[dnl
-AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_SET_IF
-AS_VAR_PUSHDEF([FLAGS], [m4_default($2,_AC_LANG_PREFIX[FLAGS])])
-AS_VAR_SET_IF(FLAGS,[
-  AS_CASE([" AS_VAR_GET(FLAGS) "],
-    [*" $1 "*], [AC_RUN_LOG([: FLAGS already contains $1])],
-    [
-     AS_VAR_APPEND(FLAGS,[" $1"])
-     AC_RUN_LOG([: FLAGS="$FLAGS"])
-    ])
-  ],
-  [
-  AS_VAR_SET(FLAGS,[$1])
-  AC_RUN_LOG([: FLAGS="$FLAGS"])
-  ])
-AS_VAR_POPDEF([FLAGS])dnl
-])dnl AX_APPEND_FLAG

m4/ax_append_link_flags.m4

@@ -1,65 +0,0 @@
-# ===========================================================================
-#   http://www.gnu.org/software/autoconf-archive/ax_append_link_flags.html
-# ===========================================================================
-#
-# SYNOPSIS
-#
-#   AX_APPEND_LINK_FLAGS([FLAG1 FLAG2 ...], [FLAGS-VARIABLE], [EXTRA-FLAGS], [INPUT])
-#
-# DESCRIPTION
-#
-#   For every FLAG1, FLAG2 it is checked whether the linker works with the
-#   flag.  If it does, the flag is added FLAGS-VARIABLE
-#
-#   If FLAGS-VARIABLE is not specified, the linker's flags (LDFLAGS) is
-#   used. During the check the flag is always added to the linker's flags.
-#
-#   If EXTRA-FLAGS is defined, it is added to the linker's default flags
-#   when the check is done.  The check is thus made with the flags: "LDFLAGS
-#   EXTRA-FLAGS FLAG".  This can for example be used to force the linker to
-#   issue an error when a bad flag is given.
-#
-#   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
-#
-#   NOTE: This macro depends on the AX_APPEND_FLAG and AX_CHECK_LINK_FLAG.
-#   Please keep this macro in sync with AX_APPEND_COMPILE_FLAGS.
-#
-# LICENSE
-#
-#   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
-#
-#   This program is free software: you can redistribute it and/or modify it
-#   under the terms of the GNU General Public License as published by the
-#   Free Software Foundation, either version 3 of the License, or (at your
-#   option) any later version.
-#
-#   This program is distributed in the hope that it will be useful, but
-#   WITHOUT ANY WARRANTY; without even the implied warranty of
-#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
-#   Public License for more details.
-#
-#   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
-#
-#   As a special exception, the respective Autoconf Macro's copyright owner
-#   gives unlimited permission to copy, distribute and modify the configure
-#   scripts that are the output of Autoconf when processing the Macro. You
-#   need not follow the terms of the GNU General Public License when using
-#   or distributing such scripts, even though portions of the text of the
-#   Macro appear in them. The GNU General Public License (GPL) does govern
-#   all other use of the material that constitutes the Autoconf Macro.
-#
-#   This special exception to the GPL applies to versions of the Autoconf
-#   Macro released by the Autoconf Archive. When you make and distribute a
-#   modified version of the Autoconf Macro, you may extend this special
-#   exception to the GPL to apply to your modified version as well.
-
-#serial 5
-
-AC_DEFUN([AX_APPEND_LINK_FLAGS],
-[AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG])
-AX_REQUIRE_DEFINED([AX_APPEND_FLAG])
-for flag in $1; do
-  AX_CHECK_LINK_FLAG([$flag], [AX_APPEND_FLAG([$flag], [m4_default([$2], [LDFLAGS])])], [], [$3], [$4])
-done
-])dnl AX_APPEND_LINK_FLAGS

m4/ax_boost_base.m4

@@ -1,285 +0,0 @@
-# ===========================================================================
-#       http://www.gnu.org/software/autoconf-archive/ax_boost_base.html
-# ===========================================================================
-#
-# SYNOPSIS
-#
-#   AX_BOOST_BASE([MINIMUM-VERSION], [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
-#
-# DESCRIPTION
-#
-#   Test for the Boost C++ libraries of a particular version (or newer)
-#
-#   If no path to the installed boost library is given the macro searchs
-#   under /usr, /usr/local, /opt and /opt/local and evaluates the
-#   $BOOST_ROOT environment variable. Further documentation is available at
-#   <http://randspringer.de/boost/index.html>.
-#
-#   This macro calls:
-#
-#     AC_SUBST(BOOST_CPPFLAGS) / AC_SUBST(BOOST_LDFLAGS)
-#
-#   And sets:
-#
-#     HAVE_BOOST
-#
-# LICENSE
-#
-#   Copyright (c) 2008 Thomas Porschberg <thomas@randspringer.de>
-#   Copyright (c) 2009 Peter Adolphs
-#
-#   Copying and distribution of this file, with or without modification, are
-#   permitted in any medium without royalty provided the copyright notice
-#   and this notice are preserved. This file is offered as-is, without any
-#   warranty.
-
-#serial 27
-
-AC_DEFUN([AX_BOOST_BASE],
-[
-AC_ARG_WITH([boost],
-  [AS_HELP_STRING([--with-boost@<:@=ARG@:>@],
-    [use Boost library from a standard location (ARG=yes),
-     from the specified location (ARG=<path>),
-     or disable it (ARG=no)
-     @<:@ARG=yes@:>@ ])],
-    [
-    if test "$withval" = "no"; then
-        want_boost="no"
-    elif test "$withval" = "yes"; then
-        want_boost="yes"
-        ac_boost_path=""
-    else
-        want_boost="yes"
-        ac_boost_path="$withval"
-    fi
-    ],
-    [want_boost="yes"])
-
-
-AC_ARG_WITH([boost-libdir],
-        AS_HELP_STRING([--with-boost-libdir=LIB_DIR],
-        [Force given directory for boost libraries. Note that this will override library path detection, so use this parameter only if default library detection fails and you know exactly where your boost libraries are located.]),
-        [
-        if test -d "$withval"
-        then
-                ac_boost_lib_path="$withval"
-        else
-                AC_MSG_ERROR(--with-boost-libdir expected directory name)
-        fi
-        ],
-        [ac_boost_lib_path=""]
-)
-
-if test "x$want_boost" = "xyes"; then
-    boost_lib_version_req=ifelse([$1], ,1.20.0,$1)
-    boost_lib_version_req_shorten=`expr $boost_lib_version_req : '\([[0-9]]*\.[[0-9]]*\)'`
-    boost_lib_version_req_major=`expr $boost_lib_version_req : '\([[0-9]]*\)'`
-    boost_lib_version_req_minor=`expr $boost_lib_version_req : '[[0-9]]*\.\([[0-9]]*\)'`
-    boost_lib_version_req_sub_minor=`expr $boost_lib_version_req : '[[0-9]]*\.[[0-9]]*\.\([[0-9]]*\)'`
-    if test "x$boost_lib_version_req_sub_minor" = "x" ; then
-        boost_lib_version_req_sub_minor="0"
-        fi
-    WANT_BOOST_VERSION=`expr $boost_lib_version_req_major \* 100000 \+  $boost_lib_version_req_minor \* 100 \+ $boost_lib_version_req_sub_minor`
-    AC_MSG_CHECKING(for boostlib >= $boost_lib_version_req)
-    succeeded=no
-
-    dnl On 64-bit systems check for system libraries in both lib64 and lib.
-    dnl The former is specified by FHS, but e.g. Debian does not adhere to
-    dnl this (as it rises problems for generic multi-arch support).
-    dnl The last entry in the list is chosen by default when no libraries
-    dnl are found, e.g. when only header-only libraries are installed!
-    libsubdirs="lib"
-    ax_arch=`uname -m`
-    case $ax_arch in
-      x86_64)
-        libsubdirs="lib64 libx32 lib lib64"
-        ;;
-      ppc64|s390x|sparc64|aarch64|ppc64le)
-        libsubdirs="lib64 lib lib64"
-        ;;
-    esac
-
-    dnl allow for real multi-arch paths e.g. /usr/lib/x86_64-linux-gnu. Give
-    dnl them priority over the other paths since, if libs are found there, they
-    dnl are almost assuredly the ones desired.
-    AC_REQUIRE([AC_CANONICAL_HOST])
-    libsubdirs="lib/${host_cpu}-${host_os} $libsubdirs"
-
-    case ${host_cpu} in
-      i?86)
-        libsubdirs="lib/i386-${host_os} $libsubdirs"
-        ;;
-    esac
-
-    dnl first we check the system location for boost libraries
-    dnl this location ist chosen if boost libraries are installed with the --layout=system option
-    dnl or if you install boost with RPM
-    if test "$ac_boost_path" != ""; then
-        BOOST_CPPFLAGS="-I$ac_boost_path/include"
-        for ac_boost_path_tmp in $libsubdirs; do
-                if test -d "$ac_boost_path"/"$ac_boost_path_tmp" ; then
-                        BOOST_LDFLAGS="-L$ac_boost_path/$ac_boost_path_tmp"
-                        break
-                fi
-        done
-    elif test "$cross_compiling" != yes; then
-        for ac_boost_path_tmp in /usr /usr/local /opt /opt/local ; do
-            if test -d "$ac_boost_path_tmp/include/boost" && test -r "$ac_boost_path_tmp/include/boost"; then
-                for libsubdir in $libsubdirs ; do
-                    if ls "$ac_boost_path_tmp/$libsubdir/libboost_"* >/dev/null 2>&1 ; then break; fi
-                done
-                BOOST_LDFLAGS="-L$ac_boost_path_tmp/$libsubdir"
-                BOOST_CPPFLAGS="-I$ac_boost_path_tmp/include"
-                break;
-            fi
-        done
-    fi
-
-    dnl overwrite ld flags if we have required special directory with
-    dnl --with-boost-libdir parameter
-    if test "$ac_boost_lib_path" != ""; then
-       BOOST_LDFLAGS="-L$ac_boost_lib_path"
-    fi
-
-    CPPFLAGS_SAVED="$CPPFLAGS"
-    CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
-    export CPPFLAGS
-
-    LDFLAGS_SAVED="$LDFLAGS"
-    LDFLAGS="$LDFLAGS $BOOST_LDFLAGS"
-    export LDFLAGS
-
-    AC_REQUIRE([AC_PROG_CXX])
-    AC_LANG_PUSH(C++)
-        AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
-    @%:@include <boost/version.hpp>
-    ]], [[
-    #if BOOST_VERSION >= $WANT_BOOST_VERSION
-    // Everything is okay
-    #else
-    #  error Boost version is too old
-    #endif
-    ]])],[
-        AC_MSG_RESULT(yes)
-    succeeded=yes
-    found_system=yes
-        ],[
-        ])
-    AC_LANG_POP([C++])
-
-
-
-    dnl if we found no boost with system layout we search for boost libraries
-    dnl built and installed without the --layout=system option or for a staged(not installed) version
-    if test "x$succeeded" != "xyes"; then
-        CPPFLAGS="$CPPFLAGS_SAVED"
-        LDFLAGS="$LDFLAGS_SAVED"
-        BOOST_CPPFLAGS=
-        BOOST_LDFLAGS=
-        _version=0
-        if test "$ac_boost_path" != ""; then
-            if test -d "$ac_boost_path" && test -r "$ac_boost_path"; then
-                for i in `ls -d $ac_boost_path/include/boost-* 2>/dev/null`; do
-                    _version_tmp=`echo $i | sed "s#$ac_boost_path##" | sed 's/\/include\/boost-//' | sed 's/_/./'`
-                    V_CHECK=`expr $_version_tmp \> $_version`
-                    if test "$V_CHECK" = "1" ; then
-                        _version=$_version_tmp
-                    fi
-                    VERSION_UNDERSCORE=`echo $_version | sed 's/\./_/'`
-                    BOOST_CPPFLAGS="-I$ac_boost_path/include/boost-$VERSION_UNDERSCORE"
-                done
-                dnl if nothing found search for layout used in Windows distributions
-                if test -z "$BOOST_CPPFLAGS"; then
-                    if test -d "$ac_boost_path/boost" && test -r "$ac_boost_path/boost"; then
-                        BOOST_CPPFLAGS="-I$ac_boost_path"
-                    fi
-                fi
-            fi
-        else
-            if test "$cross_compiling" != yes; then
-                for ac_boost_path in /usr /usr/local /opt /opt/local ; do
-                    if test -d "$ac_boost_path" && test -r "$ac_boost_path"; then
-                        for i in `ls -d $ac_boost_path/include/boost-* 2>/dev/null`; do
-                            _version_tmp=`echo $i | sed "s#$ac_boost_path##" | sed 's/\/include\/boost-//' | sed 's/_/./'`
-                            V_CHECK=`expr $_version_tmp \> $_version`
-                            if test "$V_CHECK" = "1" ; then
-                                _version=$_version_tmp
-                                best_path=$ac_boost_path
-                            fi
-                        done
-                    fi
-                done
-
-                VERSION_UNDERSCORE=`echo $_version | sed 's/\./_/'`
-                BOOST_CPPFLAGS="-I$best_path/include/boost-$VERSION_UNDERSCORE"
-                if test "$ac_boost_lib_path" = ""; then
-                    for libsubdir in $libsubdirs ; do
-                        if ls "$best_path/$libsubdir/libboost_"* >/dev/null 2>&1 ; then break; fi
-                    done
-                    BOOST_LDFLAGS="-L$best_path/$libsubdir"
-                fi
-            fi
-
-            if test "x$BOOST_ROOT" != "x"; then
-                for libsubdir in $libsubdirs ; do
-                    if ls "$BOOST_ROOT/stage/$libsubdir/libboost_"* >/dev/null 2>&1 ; then break; fi
-                done
-                if test -d "$BOOST_ROOT" && test -r "$BOOST_ROOT" && test -d "$BOOST_ROOT/stage/$libsubdir" && test -r "$BOOST_ROOT/stage/$libsubdir"; then
-                    version_dir=`expr //$BOOST_ROOT : '.*/\(.*\)'`
-                    stage_version=`echo $version_dir | sed 's/boost_//' | sed 's/_/./g'`
-                        stage_version_shorten=`expr $stage_version : '\([[0-9]]*\.[[0-9]]*\)'`
-                    V_CHECK=`expr $stage_version_shorten \>\= $_version`
-                    if test "$V_CHECK" = "1" -a "$ac_boost_lib_path" = "" ; then
-                        AC_MSG_NOTICE(We will use a staged boost library from $BOOST_ROOT)
-                        BOOST_CPPFLAGS="-I$BOOST_ROOT"
-                        BOOST_LDFLAGS="-L$BOOST_ROOT/stage/$libsubdir"
-                    fi
-                fi
-            fi
-        fi
-
-        CPPFLAGS="$CPPFLAGS $BOOST_CPPFLAGS"
-        export CPPFLAGS
-        LDFLAGS="$LDFLAGS $BOOST_LDFLAGS"
-        export LDFLAGS
-
-        AC_LANG_PUSH(C++)
-            AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
-        @%:@include <boost/version.hpp>
-        ]], [[
-        #if BOOST_VERSION >= $WANT_BOOST_VERSION
-        // Everything is okay
-        #else
-        #  error Boost version is too old
-        #endif
-        ]])],[
-            AC_MSG_RESULT(yes)
-        succeeded=yes
-        found_system=yes
-            ],[
-            ])
-        AC_LANG_POP([C++])
-    fi
-
-    if test "$succeeded" != "yes" ; then
-        if test "$_version" = "0" ; then
-            AC_MSG_NOTICE([[We could not detect the boost libraries (version $boost_lib_version_req_shorten or higher). If you have a staged boost library (still not installed) please specify \$BOOST_ROOT in your environment and do not give a PATH to --with-boost option.  If you are sure you have boost installed, then check your version number looking in <boost/version.hpp>. See http://randspringer.de/boost for more documentation.]])
-        else
-            AC_MSG_NOTICE([Your boost libraries seems to old (version $_version).])
-        fi
-        # execute ACTION-IF-NOT-FOUND (if present):
-        ifelse([$3], , :, [$3])
-    else
-        AC_SUBST(BOOST_CPPFLAGS)
-        AC_SUBST(BOOST_LDFLAGS)
-        AC_DEFINE(HAVE_BOOST,,[define if the Boost library is available])
-        # execute ACTION-IF-FOUND (if present):
-        ifelse([$2], , :, [$2])
-    fi
-
-    CPPFLAGS="$CPPFLAGS_SAVED"
-    LDFLAGS="$LDFLAGS_SAVED"
-fi
-
-])

m4/ax_check_compile_flag.m4

@@ -1,74 +0,0 @@
-# ===========================================================================
-#   http://www.gnu.org/software/autoconf-archive/ax_check_compile_flag.html
-# ===========================================================================
-#
-# SYNOPSIS
-#
-#   AX_CHECK_COMPILE_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
-#
-# DESCRIPTION
-#
-#   Check whether the given FLAG works with the current language's compiler
-#   or gives an error.  (Warnings, however, are ignored)
-#
-#   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
-#   success/failure.
-#
-#   If EXTRA-FLAGS is defined, it is added to the current language's default
-#   flags (e.g. CFLAGS) when the check is done.  The check is thus made with
-#   the flags: "CFLAGS EXTRA-FLAGS FLAG".  This can for example be used to
-#   force the compiler to issue an error when a bad flag is given.
-#
-#   INPUT gives an alternative input source to AC_COMPILE_IFELSE.
-#
-#   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
-#   macro in sync with AX_CHECK_{PREPROC,LINK}_FLAG.
-#
-# LICENSE
-#
-#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
-#   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
-#
-#   This program is free software: you can redistribute it and/or modify it
-#   under the terms of the GNU General Public License as published by the
-#   Free Software Foundation, either version 3 of the License, or (at your
-#   option) any later version.
-#
-#   This program is distributed in the hope that it will be useful, but
-#   WITHOUT ANY WARRANTY; without even the implied warranty of
-#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
-#   Public License for more details.
-#
-#   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
-#
-#   As a special exception, the respective Autoconf Macro's copyright owner
-#   gives unlimited permission to copy, distribute and modify the configure
-#   scripts that are the output of Autoconf when processing the Macro. You
-#   need not follow the terms of the GNU General Public License when using
-#   or distributing such scripts, even though portions of the text of the
-#   Macro appear in them. The GNU General Public License (GPL) does govern
-#   all other use of the material that constitutes the Autoconf Macro.
-#
-#   This special exception to the GPL applies to versions of the Autoconf
-#   Macro released by the Autoconf Archive. When you make and distribute a
-#   modified version of the Autoconf Macro, you may extend this special
-#   exception to the GPL to apply to your modified version as well.
-
-#serial 4
-
-AC_DEFUN([AX_CHECK_COMPILE_FLAG],
-[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
-AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_[]_AC_LANG_ABBREV[]flags_$4_$1])dnl
-AC_CACHE_CHECK([whether _AC_LANG compiler accepts $1], CACHEVAR, [
-  ax_check_save_flags=$[]_AC_LANG_PREFIX[]FLAGS
-  _AC_LANG_PREFIX[]FLAGS="$[]_AC_LANG_PREFIX[]FLAGS $4 $1"
-  AC_COMPILE_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
-    [AS_VAR_SET(CACHEVAR,[yes])],
-    [AS_VAR_SET(CACHEVAR,[no])])
-  _AC_LANG_PREFIX[]FLAGS=$ax_check_save_flags])
-AS_VAR_IF(CACHEVAR,yes,
-  [m4_default([$2], :)],
-  [m4_default([$3], :)])
-AS_VAR_POPDEF([CACHEVAR])dnl
-])dnl AX_CHECK_COMPILE_FLAGS

m4/ax_check_link_flag.m4

@@ -1,74 +0,0 @@
-# ===========================================================================
-#    http://www.gnu.org/software/autoconf-archive/ax_check_link_flag.html
-# ===========================================================================
-#
-# SYNOPSIS
-#
-#   AX_CHECK_LINK_FLAG(FLAG, [ACTION-SUCCESS], [ACTION-FAILURE], [EXTRA-FLAGS], [INPUT])
-#
-# DESCRIPTION
-#
-#   Check whether the given FLAG works with the linker or gives an error.
-#   (Warnings, however, are ignored)
-#
-#   ACTION-SUCCESS/ACTION-FAILURE are shell commands to execute on
-#   success/failure.
-#
-#   If EXTRA-FLAGS is defined, it is added to the linker's default flags
-#   when the check is done.  The check is thus made with the flags: "LDFLAGS
-#   EXTRA-FLAGS FLAG".  This can for example be used to force the linker to
-#   issue an error when a bad flag is given.
-#
-#   INPUT gives an alternative input source to AC_LINK_IFELSE.
-#
-#   NOTE: Implementation based on AX_CFLAGS_GCC_OPTION. Please keep this
-#   macro in sync with AX_CHECK_{PREPROC,COMPILE}_FLAG.
-#
-# LICENSE
-#
-#   Copyright (c) 2008 Guido U. Draheim <guidod@gmx.de>
-#   Copyright (c) 2011 Maarten Bosmans <mkbosmans@gmail.com>
-#
-#   This program is free software: you can redistribute it and/or modify it
-#   under the terms of the GNU General Public License as published by the
-#   Free Software Foundation, either version 3 of the License, or (at your
-#   option) any later version.
-#
-#   This program is distributed in the hope that it will be useful, but
-#   WITHOUT ANY WARRANTY; without even the implied warranty of
-#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
-#   Public License for more details.
-#
-#   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
-#
-#   As a special exception, the respective Autoconf Macro's copyright owner
-#   gives unlimited permission to copy, distribute and modify the configure
-#   scripts that are the output of Autoconf when processing the Macro. You
-#   need not follow the terms of the GNU General Public License when using
-#   or distributing such scripts, even though portions of the text of the
-#   Macro appear in them. The GNU General Public License (GPL) does govern
-#   all other use of the material that constitutes the Autoconf Macro.
-#
-#   This special exception to the GPL applies to versions of the Autoconf
-#   Macro released by the Autoconf Archive. When you make and distribute a
-#   modified version of the Autoconf Macro, you may extend this special
-#   exception to the GPL to apply to your modified version as well.
-
-#serial 4
-
-AC_DEFUN([AX_CHECK_LINK_FLAG],
-[AC_PREREQ(2.64)dnl for _AC_LANG_PREFIX and AS_VAR_IF
-AS_VAR_PUSHDEF([CACHEVAR],[ax_cv_check_ldflags_$4_$1])dnl
-AC_CACHE_CHECK([whether the linker accepts $1], CACHEVAR, [
-  ax_check_save_flags=$LDFLAGS
-  LDFLAGS="$LDFLAGS $4 $1"
-  AC_LINK_IFELSE([m4_default([$5],[AC_LANG_PROGRAM()])],
-    [AS_VAR_SET(CACHEVAR,[yes])],
-    [AS_VAR_SET(CACHEVAR,[no])])
-  LDFLAGS=$ax_check_save_flags])
-AS_VAR_IF(CACHEVAR,yes,
-  [m4_default([$2], :)],
-  [m4_default([$3], :)])
-AS_VAR_POPDEF([CACHEVAR])dnl
-])dnl AX_CHECK_LINK_FLAGS

m4/ax_cxx_compile_stdcxx.m4

@@ -1,564 +0,0 @@
-# ===========================================================================
-#   http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx.html
-# ===========================================================================
-#
-# SYNOPSIS
-#
-#   AX_CXX_COMPILE_STDCXX(VERSION, [ext|noext], [mandatory|optional])
-#
-# DESCRIPTION
-#
-#   Check for baseline language coverage in the compiler for the specified
-#   version of the C++ standard.  If necessary, add switches to CXX and
-#   CXXCPP to enable support.  VERSION may be '11' (for the C++11 standard)
-#   or '14' (for the C++14 standard).
-#
-#   The second argument, if specified, indicates whether you insist on an
-#   extended mode (e.g. -std=gnu++11) or a strict conformance mode (e.g.
-#   -std=c++11).  If neither is specified, you get whatever works, with
-#   preference for an extended mode.
-#
-#   The third argument, if specified 'mandatory' or if left unspecified,
-#   indicates that baseline support for the specified C++ standard is
-#   required and that the macro should error out if no mode with that
-#   support is found.  If specified 'optional', then configuration proceeds
-#   regardless, after defining HAVE_CXX${VERSION} if and only if a
-#   supporting mode is found.
-#
-# LICENSE
-#
-#   Copyright (c) 2008 Benjamin Kosnik <bkoz@redhat.com>
-#   Copyright (c) 2012 Zack Weinberg <zackw@panix.com>
-#   Copyright (c) 2013 Roy Stogner <roystgnr@ices.utexas.edu>
-#   Copyright (c) 2014, 2015 Google Inc.; contributed by Alexey Sokolov <sokolov@google.com>
-#   Copyright (c) 2015 Paul Norman <penorman@mac.com>
-#   Copyright (c) 2015 Moritz Klammler <moritz@klammler.eu>
-#
-#   Copying and distribution of this file, with or without modification, are
-#   permitted in any medium without royalty provided the copyright notice
-#   and this notice are preserved.  This file is offered as-is, without any
-#   warranty.
-
-#serial 4
-
-dnl  This macro is based on the code from the AX_CXX_COMPILE_STDCXX_11 macro
-dnl  (serial version number 13).
-
-AC_DEFUN([AX_CXX_COMPILE_STDCXX], [dnl
-  m4_if([$1], [11], [],
-        [$1], [14], [],
-        [$1], [17], [m4_fatal([support for C++17 not yet implemented in AX_CXX_COMPILE_STDCXX])],
-        [m4_fatal([invalid first argument `$1' to AX_CXX_COMPILE_STDCXX])])dnl
-  m4_if([$2], [], [],
-        [$2], [ext], [],
-        [$2], [noext], [],
-        [m4_fatal([invalid second argument `$2' to AX_CXX_COMPILE_STDCXX])])dnl
-  m4_if([$3], [], [ax_cxx_compile_cxx$1_required=true],
-        [$3], [mandatory], [ax_cxx_compile_cxx$1_required=true],
-        [$3], [optional], [ax_cxx_compile_cxx$1_required=false],
-        [m4_fatal([invalid third argument `$3' to AX_CXX_COMPILE_STDCXX])])
-  AC_LANG_PUSH([C++])dnl
-  ac_success=no
-  AC_CACHE_CHECK(whether $CXX supports C++$1 features by default,
-  ax_cv_cxx_compile_cxx$1,
-  [AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
-    [ax_cv_cxx_compile_cxx$1=yes],
-    [ax_cv_cxx_compile_cxx$1=no])])
-  if test x$ax_cv_cxx_compile_cxx$1 = xyes; then
-    ac_success=yes
-  fi
-
-  m4_if([$2], [noext], [], [dnl
-  if test x$ac_success = xno; then
-    for switch in -std=gnu++$1 -std=gnu++0x; do
-      cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
-      AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
-                     $cachevar,
-        [ac_save_CXX="$CXX"
-         CXX="$CXX $switch"
-         AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
-          [eval $cachevar=yes],
-          [eval $cachevar=no])
-         CXX="$ac_save_CXX"])
-      if eval test x\$$cachevar = xyes; then
-        CXX="$CXX $switch"
-        if test -n "$CXXCPP" ; then
-          CXXCPP="$CXXCPP $switch"
-        fi
-        ac_success=yes
-        break
-      fi
-    done
-  fi])
-
-  m4_if([$2], [ext], [], [dnl
-  if test x$ac_success = xno; then
-    dnl HP's aCC needs +std=c++11 according to:
-    dnl http://h21007.www2.hp.com/portal/download/files/unprot/aCxx/PDF_Release_Notes/769149-001.pdf
-    dnl Cray's crayCC needs "-h std=c++11"
-    for switch in -std=c++$1 -std=c++0x +std=c++$1 "-h std=c++$1"; do
-      cachevar=AS_TR_SH([ax_cv_cxx_compile_cxx$1_$switch])
-      AC_CACHE_CHECK(whether $CXX supports C++$1 features with $switch,
-                     $cachevar,
-        [ac_save_CXX="$CXX"
-         CXX="$CXX $switch"
-         AC_COMPILE_IFELSE([AC_LANG_SOURCE([_AX_CXX_COMPILE_STDCXX_testbody_$1])],
-          [eval $cachevar=yes],
-          [eval $cachevar=no])
-         CXX="$ac_save_CXX"])
-      if eval test x\$$cachevar = xyes; then
-        CXX="$CXX $switch"
-        if test -n "$CXXCPP" ; then
-          CXXCPP="$CXXCPP $switch"
-        fi
-        ac_success=yes
-        break
-      fi
-    done
-  fi])
-  AC_LANG_POP([C++])
-  if test x$ax_cxx_compile_cxx$1_required = xtrue; then
-    if test x$ac_success = xno; then
-      AC_MSG_ERROR([*** A compiler with support for C++$1 language features is required.])
-    fi
-  fi
-  if test x$ac_success = xno; then
-    HAVE_CXX$1=0
-    AC_MSG_NOTICE([No compiler with C++$1 support was found])
-  else
-    HAVE_CXX$1=1
-    AC_DEFINE(HAVE_CXX$1,1,
-              [define if the compiler supports basic C++$1 syntax])
-  fi
-  AC_SUBST(HAVE_CXX$1)
-])
-
-
-dnl  Test body for checking C++11 support
-
-m4_define([_AX_CXX_COMPILE_STDCXX_testbody_11],
-  _AX_CXX_COMPILE_STDCXX_testbody_new_in_11
-)
-
-
-dnl  Test body for checking C++14 support
-
-m4_define([_AX_CXX_COMPILE_STDCXX_testbody_14],
-  _AX_CXX_COMPILE_STDCXX_testbody_new_in_11
-  _AX_CXX_COMPILE_STDCXX_testbody_new_in_14
-)
-
-
-dnl  Tests for new features in C++11
-
-m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_11], [[
-
-// If the compiler admits that it is not ready for C++11, why torture it?
-// Hopefully, this will speed up the test.
-
-#ifndef __cplusplus
-
-#error "This is not a C++ compiler"
-
-#elif __cplusplus < 201103L
-
-#error "This is not a C++11 compiler"
-
-#else
-
-namespace cxx11
-{
-
-  namespace test_static_assert
-  {
-
-    template <typename T>
-    struct check
-    {
-      static_assert(sizeof(int) <= sizeof(T), "not big enough");
-    };
-
-  }
-
-  namespace test_final_override
-  {
-
-    struct Base
-    {
-      virtual void f() {}
-    };
-
-    struct Derived : public Base
-    {
-      virtual void f() override {}
-    };
-
-  }
-
-  namespace test_double_right_angle_brackets
-  {
-
-    template < typename T >
-    struct check {};
-
-    typedef check<void> single_type;
-    typedef check<check<void>> double_type;
-    typedef check<check<check<void>>> triple_type;
-    typedef check<check<check<check<void>>>> quadruple_type;
-
-  }
-
-  namespace test_decltype
-  {
-
-    int
-    f()
-    {
-      int a = 1;
-      decltype(a) b = 2;
-      return a + b;
-    }
-
-  }
-
-  namespace test_type_deduction
-  {
-
-    template < typename T1, typename T2 >
-    struct is_same
-    {
-      static const bool value = false;
-    };
-
-    template < typename T >
-    struct is_same<T, T>
-    {
-      static const bool value = true;
-    };
-
-    template < typename T1, typename T2 >
-    auto
-    add(T1 a1, T2 a2) -> decltype(a1 + a2)
-    {
-      return a1 + a2;
-    }
-
-    int
-    test(const int c, volatile int v)
-    {
-      static_assert(is_same<int, decltype(0)>::value == true, "");
-      static_assert(is_same<int, decltype(c)>::value == false, "");
-      static_assert(is_same<int, decltype(v)>::value == false, "");
-      auto ac = c;
-      auto av = v;
-      auto sumi = ac + av + 'x';
-      auto sumf = ac + av + 1.0;
-      static_assert(is_same<int, decltype(ac)>::value == true, "");
-      static_assert(is_same<int, decltype(av)>::value == true, "");
-      static_assert(is_same<int, decltype(sumi)>::value == true, "");
-      static_assert(is_same<int, decltype(sumf)>::value == false, "");
-      static_assert(is_same<int, decltype(add(c, v))>::value == true, "");
-      return (sumf > 0.0) ? sumi : add(c, v);
-    }
-
-  }
-
-  namespace test_noexcept
-  {
-
-    int f() { return 0; }
-    int g() noexcept { return 0; }
-
-    static_assert(noexcept(f()) == false, "");
-    static_assert(noexcept(g()) == true, "");
-
-  }
-
-  namespace test_constexpr
-  {
-
-    template < typename CharT >
-    unsigned long constexpr
-    strlen_c_r(const CharT *const s, const unsigned long acc) noexcept
-    {
-      return *s ? strlen_c_r(s + 1, acc + 1) : acc;
-    }
-
-    template < typename CharT >
-    unsigned long constexpr
-    strlen_c(const CharT *const s) noexcept
-    {
-      return strlen_c_r(s, 0UL);
-    }
-
-    static_assert(strlen_c("") == 0UL, "");
-    static_assert(strlen_c("1") == 1UL, "");
-    static_assert(strlen_c("example") == 7UL, "");
-    static_assert(strlen_c("another\0example") == 7UL, "");
-
-  }
-
-  namespace test_rvalue_references
-  {
-
-    template < int N >
-    struct answer
-    {
-      static constexpr int value = N;
-    };
-
-    answer<1> f(int&)       { return answer<1>(); }
-    answer<2> f(const int&) { return answer<2>(); }
-    answer<3> f(int&&)      { return answer<3>(); }
-
-    void
-    test()
-    {
-      int i = 0;
-      const int c = 0;
-      static_assert(decltype(f(i))::value == 1, "");
-      static_assert(decltype(f(c))::value == 2, "");
-      static_assert(decltype(f(0))::value == 3, "");
-    }
-
-  }
-
-  namespace test_uniform_initialization
-  {
-
-    struct test
-    {
-      static const int zero {};
-      static const int one {1};
-    };
-
-    static_assert(test::zero == 0, "");
-    static_assert(test::one == 1, "");
-
-  }
-
-  namespace test_lambdas
-  {
-
-    void
-    test1()
-    {
-      auto lambda1 = [](){};
-      auto lambda2 = lambda1;
-      lambda1();
-      lambda2();
-    }
-
-    int
-    test2()
-    {
-      auto a = [](int i, int j){ return i + j; }(1, 2);
-      auto b = []() -> int { return '0'; }();
-      auto c = [=](){ return a + b; }();
-      auto d = [&](){ return c; }();
-      auto e = [a, &b](int x) mutable {
-        const auto identity = [](int y){ return y; };
-        for (auto i = 0; i < a; ++i)
-          a += b--;
-        return x + identity(a + b);
-      }(0);
-      return a + b + c + d + e;
-    }
-
-    int
-    test3()
-    {
-      const auto nullary = [](){ return 0; };
-      const auto unary = [](int x){ return x; };
-      using nullary_t = decltype(nullary);
-      using unary_t = decltype(unary);
-      const auto higher1st = [](nullary_t f){ return f(); };
-      const auto higher2nd = [unary](nullary_t f1){
-        return [unary, f1](unary_t f2){ return f2(unary(f1())); };
-      };
-      return higher1st(nullary) + higher2nd(nullary)(unary);
-    }
-
-  }
-
-  namespace test_variadic_templates
-  {
-
-    template <int...>
-    struct sum;
-
-    template <int N0, int... N1toN>
-    struct sum<N0, N1toN...>
-    {
-      static constexpr auto value = N0 + sum<N1toN...>::value;
-    };
-
-    template <>
-    struct sum<>
-    {
-      static constexpr auto value = 0;
-    };
-
-    static_assert(sum<>::value == 0, "");
-    static_assert(sum<1>::value == 1, "");
-    static_assert(sum<23>::value == 23, "");
-    static_assert(sum<1, 2>::value == 3, "");
-    static_assert(sum<5, 5, 11>::value == 21, "");
-    static_assert(sum<2, 3, 5, 7, 11, 13>::value == 41, "");
-
-  }
-
-  // http://stackoverflow.com/questions/13728184/template-aliases-and-sfinae
-  // Clang 3.1 fails with headers of libstd++ 4.8.3 when using std::function
-  // because of this.
-  namespace test_template_alias_sfinae
-  {
-
-    struct foo {};
-
-    template<typename T>
-    using member = typename T::member_type;
-
-    template<typename T>
-    void func(...) {}
-
-    template<typename T>
-    void func(member<T>*) {}
-
-    void test();
-
-    void test() { func<foo>(0); }
-
-  }
-
-}  // namespace cxx11
-
-#endif  // __cplusplus >= 201103L
-
-]])
-
-
-dnl  Tests for new features in C++14
-
-m4_define([_AX_CXX_COMPILE_STDCXX_testbody_new_in_14], [[
-
-// If the compiler admits that it is not ready for C++14, why torture it?
-// Hopefully, this will speed up the test.
-
-#ifndef __cplusplus
-
-#error "This is not a C++ compiler"
-
-#elif __cplusplus < 201300L
-
-#error "This is not a C++14 compiler"
-
-#else
-
-namespace cxx14
-{
-
-  namespace test_polymorphic_lambdas
-  {
-
-    int
-    test()
-    {
-      const auto lambda = [](auto&&... args){
-        const auto istiny = [](auto x){
-          return (sizeof(x) == 1UL) ? 1 : 0;
-        };
-        const int aretiny[] = { istiny(args)... };
-        return aretiny[0];
-      };
-      return lambda(1, 1L, 1.0f, '1');
-    }
-
-  }
-
-  namespace test_binary_literals
-  {
-
-    constexpr auto ivii = 0b0000000000101010;
-    static_assert(ivii == 42, "wrong value");
-
-  }
-
-#ifdef DISALLOW_GCC48
-  namespace test_generalized_constexpr
-  {
-
-    template < typename CharT >
-    constexpr unsigned long
-    strlen_c(const CharT *const s) noexcept
-    {
-      auto length = 0UL;
-      for (auto p = s; *p; ++p)
-        ++length;
-      return length;
-    }
-
-    static_assert(strlen_c("") == 0UL, "");
-    static_assert(strlen_c("x") == 1UL, "");
-    static_assert(strlen_c("test") == 4UL, "");
-    static_assert(strlen_c("another\0test") == 7UL, "");
-
-  }
-#endif
-
-  namespace test_lambda_init_capture
-  {
-
-    int
-    test()
-    {
-      auto x = 0;
-      const auto lambda1 = [a = x](int b){ return a + b; };
-      const auto lambda2 = [a = lambda1(x)](){ return a; };
-      return lambda2();
-    }
-
-  }
-
-  namespace test_digit_seperators
-  {
-
-    constexpr auto ten_million = 100'000'000;
-    static_assert(ten_million == 100000000, "");
-
-  }
-
-  namespace test_return_type_deduction
-  {
-
-    auto f(int& x) { return x; }
-    decltype(auto) g(int& x) { return x; }
-
-    template < typename T1, typename T2 >
-    struct is_same
-    {
-      static constexpr auto value = false;
-    };
-
-    template < typename T >
-    struct is_same<T, T>
-    {
-      static constexpr auto value = true;
-    };
-
-    int
-    test()
-    {
-      auto x = 0;
-      static_assert(is_same<int, decltype(f(x))>::value, "");
-      static_assert(is_same<int&, decltype(g(x))>::value, "");
-      return x;
-    }
-
-  }
-
-}  // namespace cxx14
-
-#endif  // __cplusplus >= 201402L
-
-]])

m4/ax_cxx_compile_stdcxx_14.m4

@@ -1,34 +0,0 @@
-# ============================================================================
-#  http://www.gnu.org/software/autoconf-archive/ax_cxx_compile_stdcxx_14.html
-# ============================================================================
-#
-# SYNOPSIS
-#
-#   AX_CXX_COMPILE_STDCXX_14([ext|noext], [mandatory|optional])
-#
-# DESCRIPTION
-#
-#   Check for baseline language coverage in the compiler for the C++14
-#   standard; if necessary, add switches to CXX and CXXCPP to enable
-#   support.
-#
-#   This macro is a convenience alias for calling the AX_CXX_COMPILE_STDCXX
-#   macro with the version set to C++14.  The two optional arguments are
-#   forwarded literally as the second and third argument respectively.
-#   Please see the documentation for the AX_CXX_COMPILE_STDCXX macro for
-#   more information.  If you want to use this macro, you also need to
-#   download the ax_cxx_compile_stdcxx.m4 file.
-#
-# LICENSE
-#
-#   Copyright (c) 2015 Moritz Klammler <moritz@klammler.eu>
-#
-#   Copying and distribution of this file, with or without modification, are
-#   permitted in any medium without royalty provided the copyright notice
-#   and this notice are preserved. This file is offered as-is, without any
-#   warranty.
-
-#serial 4
-
-AX_REQUIRE_DEFINED([AX_CXX_COMPILE_STDCXX])
-AC_DEFUN([AX_CXX_COMPILE_STDCXX_14], [AX_CXX_COMPILE_STDCXX([14], [$1], [$2])])

m4/ax_pthread.m4

@@ -1,485 +0,0 @@
-# ===========================================================================
-#        http://www.gnu.org/software/autoconf-archive/ax_pthread.html
-# ===========================================================================
-#
-# SYNOPSIS
-#
-#   AX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
-#
-# DESCRIPTION
-#
-#   This macro figures out how to build C programs using POSIX threads. It
-#   sets the PTHREAD_LIBS output variable to the threads library and linker
-#   flags, and the PTHREAD_CFLAGS output variable to any special C compiler
-#   flags that are needed. (The user can also force certain compiler
-#   flags/libs to be tested by setting these environment variables.)
-#
-#   Also sets PTHREAD_CC to any special C compiler that is needed for
-#   multi-threaded programs (defaults to the value of CC otherwise). (This
-#   is necessary on AIX to use the special cc_r compiler alias.)
-#
-#   NOTE: You are assumed to not only compile your program with these flags,
-#   but also to link with them as well. For example, you might link with
-#   $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS $LIBS
-#
-#   If you are only building threaded programs, you may wish to use these
-#   variables in your default LIBS, CFLAGS, and CC:
-#
-#     LIBS="$PTHREAD_LIBS $LIBS"
-#     CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
-#     CC="$PTHREAD_CC"
-#
-#   In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute constant
-#   has a nonstandard name, this macro defines PTHREAD_CREATE_JOINABLE to
-#   that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
-#
-#   Also HAVE_PTHREAD_PRIO_INHERIT is defined if pthread is found and the
-#   PTHREAD_PRIO_INHERIT symbol is defined when compiling with
-#   PTHREAD_CFLAGS.
-#
-#   ACTION-IF-FOUND is a list of shell commands to run if a threads library
-#   is found, and ACTION-IF-NOT-FOUND is a list of commands to run it if it
-#   is not found. If ACTION-IF-FOUND is not specified, the default action
-#   will define HAVE_PTHREAD.
-#
-#   Please let the authors know if this macro fails on any platform, or if
-#   you have any other suggestions or comments. This macro was based on work
-#   by SGJ on autoconf scripts for FFTW (http://www.fftw.org/) (with help
-#   from M. Frigo), as well as ac_pthread and hb_pthread macros posted by
-#   Alejandro Forero Cuervo to the autoconf macro repository. We are also
-#   grateful for the helpful feedback of numerous users.
-#
-#   Updated for Autoconf 2.68 by Daniel Richard G.
-#
-# LICENSE
-#
-#   Copyright (c) 2008 Steven G. Johnson <stevenj@alum.mit.edu>
-#   Copyright (c) 2011 Daniel Richard G. <skunk@iSKUNK.ORG>
-#
-#   This program is free software: you can redistribute it and/or modify it
-#   under the terms of the GNU General Public License as published by the
-#   Free Software Foundation, either version 3 of the License, or (at your
-#   option) any later version.
-#
-#   This program is distributed in the hope that it will be useful, but
-#   WITHOUT ANY WARRANTY; without even the implied warranty of
-#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
-#   Public License for more details.
-#
-#   You should have received a copy of the GNU General Public License along
-#   with this program. If not, see <http://www.gnu.org/licenses/>.
-#
-#   As a special exception, the respective Autoconf Macro's copyright owner
-#   gives unlimited permission to copy, distribute and modify the configure
-#   scripts that are the output of Autoconf when processing the Macro. You
-#   need not follow the terms of the GNU General Public License when using
-#   or distributing such scripts, even though portions of the text of the
-#   Macro appear in them. The GNU General Public License (GPL) does govern
-#   all other use of the material that constitutes the Autoconf Macro.
-#
-#   This special exception to the GPL applies to versions of the Autoconf
-#   Macro released by the Autoconf Archive. When you make and distribute a
-#   modified version of the Autoconf Macro, you may extend this special
-#   exception to the GPL to apply to your modified version as well.
-
-#serial 23
-
-AU_ALIAS([ACX_PTHREAD], [AX_PTHREAD])
-AC_DEFUN([AX_PTHREAD], [
-AC_REQUIRE([AC_CANONICAL_HOST])
-AC_REQUIRE([AC_PROG_CC])
-AC_REQUIRE([AC_PROG_SED])
-AC_LANG_PUSH([C])
-ax_pthread_ok=no
-
-# We used to check for pthread.h first, but this fails if pthread.h
-# requires special compiler flags (e.g. on Tru64 or Sequent).
-# It gets checked for in the link test anyway.
-
-# First of all, check if the user has set any of the PTHREAD_LIBS,
-# etcetera environment variables, and if threads linking works using
-# them:
-if test "x$PTHREAD_CFLAGS$PTHREAD_LIBS" != "x"; then
-        ax_pthread_save_CC="$CC"
-        ax_pthread_save_CFLAGS="$CFLAGS"
-        ax_pthread_save_LIBS="$LIBS"
-        AS_IF([test "x$PTHREAD_CC" != "x"], [CC="$PTHREAD_CC"])
-        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
-        LIBS="$PTHREAD_LIBS $LIBS"
-        AC_MSG_CHECKING([for pthread_join using $CC $PTHREAD_CFLAGS $PTHREAD_LIBS])
-        AC_LINK_IFELSE([AC_LANG_CALL([], [pthread_join])], [ax_pthread_ok=yes])
-        AC_MSG_RESULT([$ax_pthread_ok])
-        if test "x$ax_pthread_ok" = "xno"; then
-                PTHREAD_LIBS=""
-                PTHREAD_CFLAGS=""
-        fi
-        CC="$ax_pthread_save_CC"
-        CFLAGS="$ax_pthread_save_CFLAGS"
-        LIBS="$ax_pthread_save_LIBS"
-fi
-
-# We must check for the threads library under a number of different
-# names; the ordering is very important because some systems
-# (e.g. DEC) have both -lpthread and -lpthreads, where one of the
-# libraries is broken (non-POSIX).
-
-# Create a list of thread flags to try.  Items starting with a "-" are
-# C compiler flags, and other items are library names, except for "none"
-# which indicates that we try without any flags at all, and "pthread-config"
-# which is a program returning the flags for the Pth emulation library.
-
-ax_pthread_flags="pthreads none -Kthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
-
-# The ordering *is* (sometimes) important.  Some notes on the
-# individual items follow:
-
-# pthreads: AIX (must check this before -lpthread)
-# none: in case threads are in libc; should be tried before -Kthread and
-#       other compiler flags to prevent continual compiler warnings
-# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
-# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads), Tru64
-#           (Note: HP C rejects this with "bad form for `-t' option")
-# -pthreads: Solaris/gcc (Note: HP C also rejects)
-# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
-#      doesn't hurt to check since this sometimes defines pthreads and
-#      -D_REENTRANT too), HP C (must be checked before -lpthread, which
-#      is present but should not be used directly; and before -mthreads,
-#      because the compiler interprets this as "-mt" + "-hreads")
-# -mthreads: Mingw32/gcc, Lynx/gcc
-# pthread: Linux, etcetera
-# --thread-safe: KAI C++
-# pthread-config: use pthread-config program (for GNU Pth library)
-
-case $host_os in
-
-        freebsd*)
-
-        # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
-        # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
-
-        ax_pthread_flags="-kthread lthread $ax_pthread_flags"
-        ;;
-
-        hpux*)
-
-        # From the cc(1) man page: "[-mt] Sets various -D flags to enable
-        # multi-threading and also sets -lpthread."
-
-        ax_pthread_flags="-mt -pthread pthread $ax_pthread_flags"
-        ;;
-
-        openedition*)
-
-        # IBM z/OS requires a feature-test macro to be defined in order to
-        # enable POSIX threads at all, so give the user a hint if this is
-        # not set. (We don't define these ourselves, as they can affect
-        # other portions of the system API in unpredictable ways.)
-
-        AC_EGREP_CPP([AX_PTHREAD_ZOS_MISSING],
-            [
-#            if !defined(_OPEN_THREADS) && !defined(_UNIX03_THREADS)
-             AX_PTHREAD_ZOS_MISSING
-#            endif
-            ],
-            [AC_MSG_WARN([IBM z/OS requires -D_OPEN_THREADS or -D_UNIX03_THREADS to enable pthreads support.])])
-        ;;
-
-        solaris*)
-
-        # On Solaris (at least, for some versions), libc contains stubbed
-        # (non-functional) versions of the pthreads routines, so link-based
-        # tests will erroneously succeed. (N.B.: The stubs are missing
-        # pthread_cleanup_push, or rather a function called by this macro,
-        # so we could check for that, but who knows whether they'll stub
-        # that too in a future libc.)  So we'll check first for the
-        # standard Solaris way of linking pthreads (-mt -lpthread).
-
-        ax_pthread_flags="-mt,pthread pthread $ax_pthread_flags"
-        ;;
-esac
-
-# GCC generally uses -pthread, or -pthreads on some platforms (e.g. SPARC)
-
-AS_IF([test "x$GCC" = "xyes"],
-      [ax_pthread_flags="-pthread -pthreads $ax_pthread_flags"])
-
-# The presence of a feature test macro requesting re-entrant function
-# definitions is, on some systems, a strong hint that pthreads support is
-# correctly enabled
-
-case $host_os in
-        darwin* | hpux* | linux* | osf* | solaris*)
-        ax_pthread_check_macro="_REENTRANT"
-        ;;
-
-        aix*)
-        ax_pthread_check_macro="_THREAD_SAFE"
-        ;;
-
-        *)
-        ax_pthread_check_macro="--"
-        ;;
-esac
-AS_IF([test "x$ax_pthread_check_macro" = "x--"],
-      [ax_pthread_check_cond=0],
-      [ax_pthread_check_cond="!defined($ax_pthread_check_macro)"])
-
-# Are we compiling with Clang?
-
-AC_CACHE_CHECK([whether $CC is Clang],
-    [ax_cv_PTHREAD_CLANG],
-    [ax_cv_PTHREAD_CLANG=no
-     # Note that Autoconf sets GCC=yes for Clang as well as GCC
-     if test "x$GCC" = "xyes"; then
-        AC_EGREP_CPP([AX_PTHREAD_CC_IS_CLANG],
-            [/* Note: Clang 2.7 lacks __clang_[a-z]+__ */
-#            if defined(__clang__) && defined(__llvm__)
-             AX_PTHREAD_CC_IS_CLANG
-#            endif
-            ],
-            [ax_cv_PTHREAD_CLANG=yes])
-     fi
-    ])
-ax_pthread_clang="$ax_cv_PTHREAD_CLANG"
-
-ax_pthread_clang_warning=no
-
-# Clang needs special handling, because older versions handle the -pthread
-# option in a rather... idiosyncratic way
-
-if test "x$ax_pthread_clang" = "xyes"; then
-
-        # Clang takes -pthread; it has never supported any other flag
-
-        # (Note 1: This will need to be revisited if a system that Clang
-        # supports has POSIX threads in a separate library.  This tends not
-        # to be the way of modern systems, but it's conceivable.)
-
-        # (Note 2: On some systems, notably Darwin, -pthread is not needed
-        # to get POSIX threads support; the API is always present and
-        # active.  We could reasonably leave PTHREAD_CFLAGS empty.  But
-        # -pthread does define _REENTRANT, and while the Darwin headers
-        # ignore this macro, third-party headers might not.)
-
-        PTHREAD_CFLAGS="-pthread"
-        PTHREAD_LIBS=
-
-        ax_pthread_ok=yes
-
-        # However, older versions of Clang make a point of warning the user
-        # that, in an invocation where only linking and no compilation is
-        # taking place, the -pthread option has no effect ("argument unused
-        # during compilation").  They expect -pthread to be passed in only
-        # when source code is being compiled.
-        #
-        # Problem is, this is at odds with the way Automake and most other
-        # C build frameworks function, which is that the same flags used in
-        # compilation (CFLAGS) are also used in linking.  Many systems
-        # supported by AX_PTHREAD require exactly this for POSIX threads
-        # support, and in fact it is often not straightforward to specify a
-        # flag that is used only in the compilation phase and not in
-        # linking.  Such a scenario is extremely rare in practice.
-        #
-        # Even though use of the -pthread flag in linking would only print
-        # a warning, this can be a nuisance for well-run software projects
-        # that build with -Werror.  So if the active version of Clang has
-        # this misfeature, we search for an option to squash it.
-
-        AC_CACHE_CHECK([whether Clang needs flag to prevent "argument unused" warning when linking with -pthread],
-            [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG],
-            [ax_cv_PTHREAD_CLANG_NO_WARN_FLAG=unknown
-             # Create an alternate version of $ac_link that compiles and
-             # links in two steps (.c -> .o, .o -> exe) instead of one
-             # (.c -> exe), because the warning occurs only in the second
-             # step
-             ax_pthread_save_ac_link="$ac_link"
-             ax_pthread_sed='s/conftest\.\$ac_ext/conftest.$ac_objext/g'
-             ax_pthread_link_step=`$as_echo "$ac_link" | sed "$ax_pthread_sed"`
-             ax_pthread_2step_ac_link="($ac_compile) && (echo ==== >&5) && ($ax_pthread_link_step)"
-             ax_pthread_save_CFLAGS="$CFLAGS"
-             for ax_pthread_try in '' -Qunused-arguments -Wno-unused-command-line-argument unknown; do
-                AS_IF([test "x$ax_pthread_try" = "xunknown"], [break])
-                CFLAGS="-Werror -Wunknown-warning-option $ax_pthread_try -pthread $ax_pthread_save_CFLAGS"
-                ac_link="$ax_pthread_save_ac_link"
-                AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
-                    [ac_link="$ax_pthread_2step_ac_link"
-                     AC_LINK_IFELSE([AC_LANG_SOURCE([[int main(void){return 0;}]])],
-                         [break])
-                    ])
-             done
-             ac_link="$ax_pthread_save_ac_link"
-             CFLAGS="$ax_pthread_save_CFLAGS"
-             AS_IF([test "x$ax_pthread_try" = "x"], [ax_pthread_try=no])
-             ax_cv_PTHREAD_CLANG_NO_WARN_FLAG="$ax_pthread_try"
-            ])
-
-        case "$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG" in
-                no | unknown) ;;
-                *) PTHREAD_CFLAGS="$ax_cv_PTHREAD_CLANG_NO_WARN_FLAG $PTHREAD_CFLAGS" ;;
-        esac
-
-fi # $ax_pthread_clang = yes
-
-if test "x$ax_pthread_ok" = "xno"; then
-for ax_pthread_try_flag in $ax_pthread_flags; do
-
-        case $ax_pthread_try_flag in
-                none)
-                AC_MSG_CHECKING([whether pthreads work without any flags])
-                ;;
-
-                -mt,pthread)
-                AC_MSG_CHECKING([whether pthreads work with -mt -lpthread])
-                PTHREAD_CFLAGS="-mt"
-                PTHREAD_LIBS="-lpthread"
-                ;;
-
-                -*)
-                AC_MSG_CHECKING([whether pthreads work with $ax_pthread_try_flag])
-                PTHREAD_CFLAGS="$ax_pthread_try_flag"
-                ;;
-
-                pthread-config)
-                AC_CHECK_PROG([ax_pthread_config], [pthread-config], [yes], [no])
-                AS_IF([test "x$ax_pthread_config" = "xno"], [continue])
-                PTHREAD_CFLAGS="`pthread-config --cflags`"
-                PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
-                ;;
-
-                *)
-                AC_MSG_CHECKING([for the pthreads library -l$ax_pthread_try_flag])
-                PTHREAD_LIBS="-l$ax_pthread_try_flag"
-                ;;
-        esac
-
-        ax_pthread_save_CFLAGS="$CFLAGS"
-        ax_pthread_save_LIBS="$LIBS"
-        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
-        LIBS="$PTHREAD_LIBS $LIBS"
-
-        # Check for various functions.  We must include pthread.h,
-        # since some functions may be macros.  (On the Sequent, we
-        # need a special flag -Kthread to make this header compile.)
-        # We check for pthread_join because it is in -lpthread on IRIX
-        # while pthread_create is in libc.  We check for pthread_attr_init
-        # due to DEC craziness with -lpthreads.  We check for
-        # pthread_cleanup_push because it is one of the few pthread
-        # functions on Solaris that doesn't have a non-functional libc stub.
-        # We try pthread_create on general principles.
-
-        AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>
-#                       if $ax_pthread_check_cond
-#                        error "$ax_pthread_check_macro must be defined"
-#                       endif
-                        static void routine(void *a) { a = 0; }
-                        static void *start_routine(void *a) { return a; }],
-                       [pthread_t th; pthread_attr_t attr;
-                        pthread_create(&th, 0, start_routine, 0);
-                        pthread_join(th, 0);
-                        pthread_attr_init(&attr);
-                        pthread_cleanup_push(routine, 0);
-                        pthread_cleanup_pop(0) /* ; */])],
-            [ax_pthread_ok=yes],
-            [])
-
-        CFLAGS="$ax_pthread_save_CFLAGS"
-        LIBS="$ax_pthread_save_LIBS"
-
-        AC_MSG_RESULT([$ax_pthread_ok])
-        AS_IF([test "x$ax_pthread_ok" = "xyes"], [break])
-
-        PTHREAD_LIBS=""
-        PTHREAD_CFLAGS=""
-done
-fi
-
-# Various other checks:
-if test "x$ax_pthread_ok" = "xyes"; then
-        ax_pthread_save_CFLAGS="$CFLAGS"
-        ax_pthread_save_LIBS="$LIBS"
-        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
-        LIBS="$PTHREAD_LIBS $LIBS"
-
-        # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
-        AC_CACHE_CHECK([for joinable pthread attribute],
-            [ax_cv_PTHREAD_JOINABLE_ATTR],
-            [ax_cv_PTHREAD_JOINABLE_ATTR=unknown
-             for ax_pthread_attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
-                 AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <pthread.h>],
-                                                 [int attr = $ax_pthread_attr; return attr /* ; */])],
-                                [ax_cv_PTHREAD_JOINABLE_ATTR=$ax_pthread_attr; break],
-                                [])
-             done
-            ])
-        AS_IF([test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xunknown" && \
-               test "x$ax_cv_PTHREAD_JOINABLE_ATTR" != "xPTHREAD_CREATE_JOINABLE" && \
-               test "x$ax_pthread_joinable_attr_defined" != "xyes"],
-              [AC_DEFINE_UNQUOTED([PTHREAD_CREATE_JOINABLE],
-                                  [$ax_cv_PTHREAD_JOINABLE_ATTR],
-                                  [Define to necessary symbol if this constant
-                                   uses a non-standard name on your system.])
-               ax_pthread_joinable_attr_defined=yes
-              ])
-
-        AC_CACHE_CHECK([whether more special flags are required for pthreads],
-            [ax_cv_PTHREAD_SPECIAL_FLAGS],
-            [ax_cv_PTHREAD_SPECIAL_FLAGS=no
-             case $host_os in
-             solaris*)
-             ax_cv_PTHREAD_SPECIAL_FLAGS="-D_POSIX_PTHREAD_SEMANTICS"
-             ;;
-             esac
-            ])
-        AS_IF([test "x$ax_cv_PTHREAD_SPECIAL_FLAGS" != "xno" && \
-               test "x$ax_pthread_special_flags_added" != "xyes"],
-              [PTHREAD_CFLAGS="$ax_cv_PTHREAD_SPECIAL_FLAGS $PTHREAD_CFLAGS"
-               ax_pthread_special_flags_added=yes])
-
-        AC_CACHE_CHECK([for PTHREAD_PRIO_INHERIT],
-            [ax_cv_PTHREAD_PRIO_INHERIT],
-            [AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <pthread.h>]],
-                                             [[int i = PTHREAD_PRIO_INHERIT;]])],
-                            [ax_cv_PTHREAD_PRIO_INHERIT=yes],
-                            [ax_cv_PTHREAD_PRIO_INHERIT=no])
-            ])
-        AS_IF([test "x$ax_cv_PTHREAD_PRIO_INHERIT" = "xyes" && \
-               test "x$ax_pthread_prio_inherit_defined" != "xyes"],
-              [AC_DEFINE([HAVE_PTHREAD_PRIO_INHERIT], [1], [Have PTHREAD_PRIO_INHERIT.])
-               ax_pthread_prio_inherit_defined=yes
-              ])
-
-        CFLAGS="$ax_pthread_save_CFLAGS"
-        LIBS="$ax_pthread_save_LIBS"
-
-        # More AIX lossage: compile with *_r variant
-        if test "x$GCC" != "xyes"; then
-            case $host_os in
-                aix*)
-                AS_CASE(["x/$CC"],
-                    [x*/c89|x*/c89_128|x*/c99|x*/c99_128|x*/cc|x*/cc128|x*/xlc|x*/xlc_v6|x*/xlc128|x*/xlc128_v6],
-                    [#handle absolute path differently from PATH based program lookup
-                     AS_CASE(["x$CC"],
-                         [x/*],
-                         [AS_IF([AS_EXECUTABLE_P([${CC}_r])],[PTHREAD_CC="${CC}_r"])],
-                         [AC_CHECK_PROGS([PTHREAD_CC],[${CC}_r],[$CC])])])
-                ;;
-            esac
-        fi
-fi
-
-test -n "$PTHREAD_CC" || PTHREAD_CC="$CC"
-
-AC_SUBST([PTHREAD_LIBS])
-AC_SUBST([PTHREAD_CFLAGS])
-AC_SUBST([PTHREAD_CC])
-
-# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
-if test "x$ax_pthread_ok" = "xyes"; then
-        ifelse([$1],,[AC_DEFINE([HAVE_PTHREAD],[1],[Define if you have POSIX threads libraries and header files.])],[$1])
-        :
-else
-        ax_pthread_ok=no
-        $2
-fi
-AC_LANG_POP
-])dnl AX_PTHREAD

m4/ax_require_defined.m4

@@ -1,37 +0,0 @@
-# ===========================================================================
-#    http://www.gnu.org/software/autoconf-archive/ax_require_defined.html
-# ===========================================================================
-#
-# SYNOPSIS
-#
-#   AX_REQUIRE_DEFINED(MACRO)
-#
-# DESCRIPTION
-#
-#   AX_REQUIRE_DEFINED is a simple helper for making sure other macros have
-#   been defined and thus are available for use.  This avoids random issues
-#   where a macro isn't expanded.  Instead the configure script emits a
-#   non-fatal:
-#
-#     ./configure: line 1673: AX_CFLAGS_WARN_ALL: command not found
-#
-#   It's like AC_REQUIRE except it doesn't expand the required macro.
-#
-#   Here's an example:
-#
-#     AX_REQUIRE_DEFINED([AX_CHECK_LINK_FLAG])
-#
-# LICENSE
-#
-#   Copyright (c) 2014 Mike Frysinger <vapier@gentoo.org>
-#
-#   Copying and distribution of this file, with or without modification, are
-#   permitted in any medium without royalty provided the copyright notice
-#   and this notice are preserved. This file is offered as-is, without any
-#   warranty.
-
-#serial 1
-
-AC_DEFUN([AX_REQUIRE_DEFINED], [dnl
-  m4_ifndef([$1], [m4_fatal([macro ]$1[ is not defined; is a m4 file missing?])])
-])dnl AX_REQUIRE_DEFINED

m4/libwrap.m4

@@ -1,14 +0,0 @@
-dnl
-dnl Usage:
-dnl AC_CHECK_LIBWRAP([ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
-dnl
-
-AC_DEFUN([AC_CHECK_LIBWRAP],[
-	AC_CHECK_HEADERS([tcpd.h],
-		AC_CHECK_LIB([wrap], [request_init],
-			[LIBWRAP_CFLAGS=""
-			LIBWRAP_LDFLAGS="-lwrap"
-			$1],
-			$2),
-		$2)
-])

m4/mpd_auto.m4

@@ -1,185 +0,0 @@
-dnl Parameters: varname1, description
-AC_DEFUN([MPD_AUTO_ENABLED], [
-	if test x$[]enable_$1 = xauto; then
-		AC_MSG_NOTICE([auto-detected $2])
-		enable_$1=yes
-	fi
-])
-
-dnl Parameters: varname1, description, errmsg
-AC_DEFUN([MPD_AUTO_DISABLED], [
-	if test x$[]enable_$1 = xauto; then
-		AC_MSG_WARN([$3 -- disabling $2])
-		enable_$1=no
-	elif test x$[]enable_$1 = xyes; then
-		AC_MSG_ERROR([$2: $3])
-	fi
-])
-
-dnl Check whether a prerequisite for a feature was found.  This is
-dnl very similar to MPD_AUTO_RESULT, but does not finalize the
-dnl detection; it assumes that more checks will follow.
-AC_DEFUN([MPD_AUTO_PRE], [
-	if test x$[]enable_$1 != xno && test x$[]found_$1 = xno; then
-                MPD_AUTO_DISABLED([$1], [$2], [$3])
-	fi
-])
-
-dnl Evaluate a check's result.  Abort if the feature was requested
-dnl explicitly but is unavailable.
-dnl
-dnl Parameters: varname1, description, errmsg
-AC_DEFUN([MPD_AUTO_RESULT], [
-	if test x$[]enable_$1 = xno; then
-		found_$1=no
-	fi
-
-	if test x$[]found_$1 = xyes; then
-                MPD_AUTO_ENABLED([$1], [$2])
-	else
-                MPD_AUTO_DISABLED([$1], [$2], [$3])
-	fi
-])
-
-dnl Invoke a check if its configuration is "yes" or "auto" and call
-dnl MPD_AUTO_RESULT.
-dnl
-dnl Parameters: varname1, description, errmsg, check
-AC_DEFUN([MPD_AUTO], [
-	if test x$[]enable_$1 != xno; then
-		$4
-	fi
-	MPD_AUTO_RESULT([$1], [$2], [$3])
-])
-
-dnl Wrapper for MPD_AUTO and PKG_CHECK_MODULES.
-dnl
-dnl Parameters: varname1, varname2, pkgname, description, errmsg
-AC_DEFUN([MPD_AUTO_PKG], [
-	MPD_AUTO([$1], [$4], [$5],
-		[PKG_CHECK_MODULES([$2], [$3],
-			[found_$1=yes],
-			[found_$1=no])])
-])
-
-dnl Check with pkg-config first, fall back to AC_CHECK_LIB.
-dnl
-dnl Parameters: varname1, varname2, pkgname, libname, symname, libs, cflags, description, errmsg
-AC_DEFUN([MPD_AUTO_PKG_LIB], [
-	MPD_AUTO([$1], [$8], [$9],
-		[PKG_CHECK_MODULES([$2], [$3],
-			[found_$1=yes],
-			AC_CHECK_LIB($4, $5,
-				[found_$1=yes $2_LIBS='$6' $2_CFLAGS='$7'],
-				[found_$1=no],
-				[$6]))])
-])
-
-dnl Wrapper for AC_CHECK_LIB.
-dnl
-dnl Parameters: varname1, varname2, libname, symname, libs, cflags, description, errmsg
-AC_DEFUN([MPD_AUTO_LIB], [
-	AC_SUBST([$2_LIBS], [])
-	AC_SUBST([$2_CFLAGS], [])
-
-	MPD_AUTO([$1], [$7], [$8],
-		[AC_CHECK_LIB($3, $4,
-			[found_$1=yes $2_LIBS='$5' $2_CFLAGS='$6'],
-			[found_$1=no],
-			[$5])])
-])
-
-dnl Wrapper for AC_CHECK_HEADER.
-dnl
-dnl Parameters: varname1, varname2, header, libs, cflags, description, errmsg
-AC_DEFUN([MPD_AUTO_HEADER], [
-	AC_SUBST([$2_LIBS], [])
-	AC_SUBST([$2_CFLAGS], [])
-
-	MPD_AUTO([$1], [$6], [$7],
-		[AC_CHECK_HEADER([$3],
-			[found_$1=yes $2_LIBS='$4' $2_CFLAGS='$5'],
-			[found_$1=no])])
-])
-
-dnl Convert the given string into a string for the "default value" in
-dnl the help text.  If the string is a literal, then it is returned
-dnl as-is; if it contains a variable reference, just "auto" is
-dnl emitted.
-dnl
-dnl Parameters: varname1
-AC_DEFUN([MPD_FORMAT_DEFAULT],
-	[ifelse([$1], [], [auto],
-		index([$1], [$]), [-1], [$1],
-		[auto])])
-
-dnl Wrapper for AC_ARG_ENABLE, AC_DEFINE and AM_CONDITIONAL
-dnl
-dnl Parameters: varname1, varname2, description, default, check
-AC_DEFUN([MPD_ARG_ENABLE], [
-	AC_ARG_ENABLE(translit([$1], [_], [-]),
-		AS_HELP_STRING([--enable-]translit([$1], [_], [-]),
-			[enable $3 (default: ]MPD_FORMAT_DEFAULT([$4])[)]),,
-		[enable_$1=]ifelse([$4], [], [auto], [$4]))
-
-	$5
-
-	MPD_DEFINE_CONDITIONAL(enable_$1, ENABLE_$2, [$3])
-])
-
-dnl Wrapper for MPD_ARG_ENABLE and MPD_AUTO
-dnl
-dnl Parameters: varname1, varname2, description, errmsg, default, check
-AC_DEFUN([MPD_ENABLE_AUTO], [
-	MPD_ARG_ENABLE([$1], [$2], [$3], [$5], [
-		MPD_AUTO([$1], [$3], [$4], [$6])
-	])
-])
-
-dnl Wrapper for AC_ARG_ENABLE and MPD_AUTO_PKG
-dnl
-dnl Parameters: varname1, varname2, pkg, description, errmsg, default, pre
-AC_DEFUN([MPD_ENABLE_AUTO_PKG], [
-	MPD_ARG_ENABLE([$1], [$2], [$4], [$6], [
-		$7
-		MPD_AUTO_PKG($1, $2, $3, $4, $5)
-	])
-])
-
-dnl Wrapper for AC_ARG_ENABLE and MPD_AUTO_PKG_LIB
-dnl
-dnl Parameters: varname1, varname2, pkg, libname, symname, libs, cflags, description, errmsg, default, pre
-AC_DEFUN([MPD_ENABLE_AUTO_PKG_LIB], [
-	MPD_ARG_ENABLE([$1], [$2], [$8], [$10], [
-		$11
-		MPD_AUTO_PKG_LIB($1, $2, $3, $4, $5, $6, $7, $8, $9)
-	])
-])
-
-dnl Wrapper for AC_ARG_ENABLE and MPD_AUTO_LIB
-dnl
-dnl Parameters: varname1, varname2, libname, symname, libs, cflags, description, errmsg, default, pre
-AC_DEFUN([MPD_ENABLE_AUTO_LIB], [
-	MPD_ARG_ENABLE([$1], [$2], [$7], [$9], [
-		$10
-		MPD_AUTO_LIB($1, $2, $3, $4, $5, $6, $7, $8)
-	])
-])
-
-dnl Wrapper for AC_ARG_ENABLE and MPD_AUTO_HEADER
-dnl
-dnl Parameters: varname1, varname2, header, libs, cflags, description, errmsg, default, pre
-AC_DEFUN([MPD_ENABLE_AUTO_HEADER], [
-	MPD_ARG_ENABLE([$1], [$2], [$6], [$8], [
-		$9
-		MPD_AUTO_HEADER($1, $2, $3, $4, $5, $6, $7)
-	])
-])
-
-dnl Wrapper for MPD_ENABLE_AUTO_PKG and MPD_DEPENDS
-dnl
-dnl Parameters: varname1, varname2, pkg, description, errmsg, default, dep_variable, dep_errmsg
-AC_DEFUN([MPD_ENABLE_AUTO_PKG_DEPENDS], [
-	MPD_ENABLE_AUTO_PKG([$1], [$2], [$3], [$4], [$5], [$6],
-		[MPD_DEPENDS([enable_$1], [$7], [$8])])
-])

m4/mpd_define_conditional.m4

@@ -1,8 +0,0 @@
-dnl Wrapper for AC_DEFINE and AM_CONDITIONAL
-dnl
-dnl Parameters: varname1, varname2, description
-AC_DEFUN([MPD_DEFINE_CONDITIONAL], [dnl
-	AM_CONDITIONAL($2, test x$[]$1 = xyes)
-	if test x$[]$1 = xyes; then
-		AC_DEFINE($2, 1, [Define to enable $3])
-	fi])

m4/mpd_depends.m4

@@ -1,9 +0,0 @@
-AC_DEFUN([MPD_DEPENDS], [
-	if test x$$2 = xno; then
-		if test x$$1 = xauto; then
-			$1=no
-		elif test x$$1 = xyes; then
-			AC_MSG_ERROR([$3])
-		fi
-	fi
-])

m4/mpd_func.m4

@@ -1,25 +0,0 @@
-dnl MPD_OPTIONAL_FUNC(name, func, macro)
-dnl
-dnl Allow the user to enable or disable the use of a function.  If the
-dnl option is not specified, the function is auto-detected.
-AC_DEFUN([MPD_OPTIONAL_FUNC], [
-	AC_ARG_ENABLE([$1],
-		AS_HELP_STRING([--enable-$1],
-			[use the function "$1" (default: auto)]),
-		[test x$[]enable_$1 = xyes && AC_DEFINE([$3], 1, [Define to use $1])],
-		[AC_CHECK_FUNC([$2],
-			[AC_DEFINE([$3], 1, [Define to use $1])],)])
-])
-
-dnl MPD_OPTIONAL_FUNC_NODEF(name, func)
-dnl
-dnl Allow the user to enable or disable the use of a function.
-dnl Works similar to MPD_OPTIONAL_FUNC, however MPD_OPTIONAL_FUNC_NODEF
-dnl does not invoke AC_DEFINE when function is enabled. Shell variable
-dnl enable_$name is set to "yes" instead.
-AC_DEFUN([MPD_OPTIONAL_FUNC_NODEF], [
-	AC_ARG_ENABLE([$1],
-		AS_HELP_STRING([--enable-$1],
-			[use the function "$1" (default: auto)]),,
-		[AC_CHECK_FUNC([$2], [enable_$1=yes],)])
-])

m4/mpd_with_flags.m4

@@ -1,23 +0,0 @@
-dnl Run code with the specified CFLAGS/CXXFLAGS and LIBS appended.
-dnl Restores the old values afterwards.
-dnl
-dnl Parameters: cflags, libs, code
-AC_DEFUN([MPD_WITH_FLAGS], [
-	ac_save_CFLAGS="$[]CFLAGS"
-	ac_save_CXXFLAGS="$[]CXXFLAGS"
-	ac_save_LIBS="$[]LIBS"
-	CFLAGS="$[]CFLAGS $1"
-	CXXFLAGS="$[]CXXFLAGS $1"
-	LIBS="$[]LIBS $2"
-	$3
-	CFLAGS="$[]ac_save_CFLAGS"
-	CXXFLAGS="$[]ac_save_CXXFLAGS"
-	LIBS="$[]ac_save_LIBS"
-])
-
-dnl Run code with the specified library's CFLAGS/CXXFLAGS and LIBS
-dnl appended.  Restores the old values afterwards.
-dnl
-dnl Parameters: libname, code
-AC_DEFUN([MPD_WITH_LIBRARY],
-	[MPD_WITH_FLAGS([$[]$1_CFLAGS], [$[]$1_LIBS], [$2])])

m4/pkg.m4

@@ -1,275 +0,0 @@
-dnl pkg.m4 - Macros to locate and utilise pkg-config.   -*- Autoconf -*-
-dnl serial 11 (pkg-config-0.29)
-dnl
-dnl Copyright © 2004 Scott James Remnant <scott@netsplit.com>.
-dnl Copyright © 2012-2015 Dan Nicholson <dbn.lists@gmail.com>
-dnl
-dnl This program is free software; you can redistribute it and/or modify
-dnl it under the terms of the GNU General Public License as published by
-dnl the Free Software Foundation; either version 2 of the License, or
-dnl (at your option) any later version.
-dnl
-dnl This program is distributed in the hope that it will be useful, but
-dnl WITHOUT ANY WARRANTY; without even the implied warranty of
-dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-dnl General Public License for more details.
-dnl
-dnl You should have received a copy of the GNU General Public License
-dnl along with this program; if not, write to the Free Software
-dnl Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
-dnl 02111-1307, USA.
-dnl
-dnl As a special exception to the GNU General Public License, if you
-dnl distribute this file as part of a program that contains a
-dnl configuration script generated by Autoconf, you may include it under
-dnl the same distribution terms that you use for the rest of that
-dnl program.
-
-dnl PKG_PREREQ(MIN-VERSION)
-dnl -----------------------
-dnl Since: 0.29
-dnl
-dnl Verify that the version of the pkg-config macros are at least
-dnl MIN-VERSION. Unlike PKG_PROG_PKG_CONFIG, which checks the user's
-dnl installed version of pkg-config, this checks the developer's version
-dnl of pkg.m4 when generating configure.
-dnl
-dnl To ensure that this macro is defined, also add:
-dnl m4_ifndef([PKG_PREREQ],
-dnl     [m4_fatal([must install pkg-config 0.29 or later before running autoconf/autogen])])
-dnl
-dnl See the "Since" comment for each macro you use to see what version
-dnl of the macros you require.
-m4_defun([PKG_PREREQ],
-[m4_define([PKG_MACROS_VERSION], [0.29])
-m4_if(m4_version_compare(PKG_MACROS_VERSION, [$1]), -1,
-    [m4_fatal([pkg.m4 version $1 or higher is required but ]PKG_MACROS_VERSION[ found])])
-])dnl PKG_PREREQ
-
-dnl PKG_PROG_PKG_CONFIG([MIN-VERSION])
-dnl ----------------------------------
-dnl Since: 0.16
-dnl
-dnl Search for the pkg-config tool and set the PKG_CONFIG variable to
-dnl first found in the path. Checks that the version of pkg-config found
-dnl is at least MIN-VERSION. If MIN-VERSION is not specified, 0.9.0 is
-dnl used since that's the first version where most current features of
-dnl pkg-config existed.
-AC_DEFUN([PKG_PROG_PKG_CONFIG],
-[m4_pattern_forbid([^_?PKG_[A-Z_]+$])
-m4_pattern_allow([^PKG_CONFIG(_(PATH|LIBDIR|SYSROOT_DIR|ALLOW_SYSTEM_(CFLAGS|LIBS)))?$])
-m4_pattern_allow([^PKG_CONFIG_(DISABLE_UNINSTALLED|TOP_BUILD_DIR|DEBUG_SPEW)$])
-AC_ARG_VAR([PKG_CONFIG], [path to pkg-config utility])
-AC_ARG_VAR([PKG_CONFIG_PATH], [directories to add to pkg-config's search path])
-AC_ARG_VAR([PKG_CONFIG_LIBDIR], [path overriding pkg-config's built-in search path])
-
-if test "x$ac_cv_env_PKG_CONFIG_set" != "xset"; then
-	AC_PATH_TOOL([PKG_CONFIG], [pkg-config])
-fi
-if test -n "$PKG_CONFIG"; then
-	_pkg_min_version=m4_default([$1], [0.9.0])
-	AC_MSG_CHECKING([pkg-config is at least version $_pkg_min_version])
-	if $PKG_CONFIG --atleast-pkgconfig-version $_pkg_min_version; then
-		AC_MSG_RESULT([yes])
-	else
-		AC_MSG_RESULT([no])
-		PKG_CONFIG=""
-	fi
-fi[]dnl
-])dnl PKG_PROG_PKG_CONFIG
-
-dnl PKG_CHECK_EXISTS(MODULES, [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
-dnl -------------------------------------------------------------------
-dnl Since: 0.18
-dnl
-dnl Check to see whether a particular set of modules exists. Similar to
-dnl PKG_CHECK_MODULES(), but does not set variables or print errors.
-dnl
-dnl Please remember that m4 expands AC_REQUIRE([PKG_PROG_PKG_CONFIG])
-dnl only at the first occurence in configure.ac, so if the first place
-dnl it's called might be skipped (such as if it is within an "if", you
-dnl have to call PKG_CHECK_EXISTS manually
-AC_DEFUN([PKG_CHECK_EXISTS],
-[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
-if test -n "$PKG_CONFIG" && \
-    AC_RUN_LOG([$PKG_CONFIG --exists --print-errors "$1"]); then
-  m4_default([$2], [:])
-m4_ifvaln([$3], [else
-  $3])dnl
-fi])
-
-dnl _PKG_CONFIG([VARIABLE], [COMMAND], [MODULES])
-dnl ---------------------------------------------
-dnl Internal wrapper calling pkg-config via PKG_CONFIG and setting
-dnl pkg_failed based on the result.
-m4_define([_PKG_CONFIG],
-[if test -n "$$1"; then
-    pkg_cv_[]$1="$$1"
- elif test -n "$PKG_CONFIG"; then
-    PKG_CHECK_EXISTS([$3],
-                     [pkg_cv_[]$1=`$PKG_CONFIG --[]$2 "$3" 2>/dev/null`
-		      test "x$?" != "x0" && pkg_failed=yes ],
-		     [pkg_failed=yes])
- else
-    pkg_failed=untried
-fi[]dnl
-])dnl _PKG_CONFIG
-
-dnl _PKG_SHORT_ERRORS_SUPPORTED
-dnl ---------------------------
-dnl Internal check to see if pkg-config supports short errors.
-AC_DEFUN([_PKG_SHORT_ERRORS_SUPPORTED],
-[AC_REQUIRE([PKG_PROG_PKG_CONFIG])
-if $PKG_CONFIG --atleast-pkgconfig-version 0.20; then
-        _pkg_short_errors_supported=yes
-else
-        _pkg_short_errors_supported=no
-fi[]dnl
-])dnl _PKG_SHORT_ERRORS_SUPPORTED
-
-
-dnl PKG_CHECK_MODULES(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
-dnl   [ACTION-IF-NOT-FOUND])
-dnl --------------------------------------------------------------
-dnl Since: 0.4.0
-dnl
-dnl Note that if there is a possibility the first call to
-dnl PKG_CHECK_MODULES might not happen, you should be sure to include an
-dnl explicit call to PKG_PROG_PKG_CONFIG in your configure.ac
-AC_DEFUN([PKG_CHECK_MODULES],
-[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
-AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl
-AC_ARG_VAR([$1][_LIBS], [linker flags for $1, overriding pkg-config])dnl
-
-pkg_failed=no
-AC_MSG_CHECKING([for $1])
-
-_PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
-_PKG_CONFIG([$1][_LIBS], [libs], [$2])
-
-m4_define([_PKG_TEXT], [Alternatively, you may set the environment variables $1[]_CFLAGS
-and $1[]_LIBS to avoid the need to call pkg-config.
-See the pkg-config man page for more details.])
-
-if test $pkg_failed = yes; then
-   	AC_MSG_RESULT([no])
-        _PKG_SHORT_ERRORS_SUPPORTED
-        if test $_pkg_short_errors_supported = yes; then
-	        $1[]_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "$2" 2>&1`
-        else 
-	        $1[]_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "$2" 2>&1`
-        fi
-	# Put the nasty error message in config.log where it belongs
-	echo "$$1[]_PKG_ERRORS" >&AS_MESSAGE_LOG_FD
-
-	m4_default([$4], [AC_MSG_ERROR(
-[Package requirements ($2) were not met:
-
-$$1_PKG_ERRORS
-
-Consider adjusting the PKG_CONFIG_PATH environment variable if you
-installed software in a non-standard prefix.
-
-_PKG_TEXT])[]dnl
-        ])
-elif test $pkg_failed = untried; then
-     	AC_MSG_RESULT([no])
-	m4_default([$4], [AC_MSG_FAILURE(
-[The pkg-config script could not be found or is too old.  Make sure it
-is in your PATH or set the PKG_CONFIG environment variable to the full
-path to pkg-config.
-
-_PKG_TEXT
-
-To get pkg-config, see <http://pkg-config.freedesktop.org/>.])[]dnl
-        ])
-else
-	$1[]_CFLAGS=$pkg_cv_[]$1[]_CFLAGS
-	$1[]_LIBS=$pkg_cv_[]$1[]_LIBS
-        AC_MSG_RESULT([yes])
-	$3
-fi[]dnl
-])dnl PKG_CHECK_MODULES
-
-
-dnl PKG_CHECK_MODULES_STATIC(VARIABLE-PREFIX, MODULES, [ACTION-IF-FOUND],
-dnl   [ACTION-IF-NOT-FOUND])
-dnl ---------------------------------------------------------------------
-dnl Since: 0.29
-dnl
-dnl Checks for existence of MODULES and gathers its build flags with
-dnl static libraries enabled. Sets VARIABLE-PREFIX_CFLAGS from --cflags
-dnl and VARIABLE-PREFIX_LIBS from --libs.
-dnl
-dnl Note that if there is a possibility the first call to
-dnl PKG_CHECK_MODULES_STATIC might not happen, you should be sure to
-dnl include an explicit call to PKG_PROG_PKG_CONFIG in your
-dnl configure.ac.
-AC_DEFUN([PKG_CHECK_MODULES_STATIC],
-[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
-_save_PKG_CONFIG=$PKG_CONFIG
-PKG_CONFIG="$PKG_CONFIG --static"
-PKG_CHECK_MODULES($@)
-PKG_CONFIG=$_save_PKG_CONFIG[]dnl
-])dnl PKG_CHECK_MODULES_STATIC
-
-
-dnl PKG_INSTALLDIR([DIRECTORY])
-dnl -------------------------
-dnl Since: 0.27
-dnl
-dnl Substitutes the variable pkgconfigdir as the location where a module
-dnl should install pkg-config .pc files. By default the directory is
-dnl $libdir/pkgconfig, but the default can be changed by passing
-dnl DIRECTORY. The user can override through the --with-pkgconfigdir
-dnl parameter.
-AC_DEFUN([PKG_INSTALLDIR],
-[m4_pushdef([pkg_default], [m4_default([$1], ['${libdir}/pkgconfig'])])
-m4_pushdef([pkg_description],
-    [pkg-config installation directory @<:@]pkg_default[@:>@])
-AC_ARG_WITH([pkgconfigdir],
-    [AS_HELP_STRING([--with-pkgconfigdir], pkg_description)],,
-    [with_pkgconfigdir=]pkg_default)
-AC_SUBST([pkgconfigdir], [$with_pkgconfigdir])
-m4_popdef([pkg_default])
-m4_popdef([pkg_description])
-])dnl PKG_INSTALLDIR
-
-
-dnl PKG_NOARCH_INSTALLDIR([DIRECTORY])
-dnl --------------------------------
-dnl Since: 0.27
-dnl
-dnl Substitutes the variable noarch_pkgconfigdir as the location where a
-dnl module should install arch-independent pkg-config .pc files. By
-dnl default the directory is $datadir/pkgconfig, but the default can be
-dnl changed by passing DIRECTORY. The user can override through the
-dnl --with-noarch-pkgconfigdir parameter.
-AC_DEFUN([PKG_NOARCH_INSTALLDIR],
-[m4_pushdef([pkg_default], [m4_default([$1], ['${datadir}/pkgconfig'])])
-m4_pushdef([pkg_description],
-    [pkg-config arch-independent installation directory @<:@]pkg_default[@:>@])
-AC_ARG_WITH([noarch-pkgconfigdir],
-    [AS_HELP_STRING([--with-noarch-pkgconfigdir], pkg_description)],,
-    [with_noarch_pkgconfigdir=]pkg_default)
-AC_SUBST([noarch_pkgconfigdir], [$with_noarch_pkgconfigdir])
-m4_popdef([pkg_default])
-m4_popdef([pkg_description])
-])dnl PKG_NOARCH_INSTALLDIR
-
-
-dnl PKG_CHECK_VAR(VARIABLE, MODULE, CONFIG-VARIABLE,
-dnl [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
-dnl -------------------------------------------
-dnl Since: 0.28
-dnl
-dnl Retrieves the value of the pkg-config variable for the given module.
-AC_DEFUN([PKG_CHECK_VAR],
-[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
-AC_ARG_VAR([$1], [value of $3 for $2, overriding pkg-config])dnl
-
-_PKG_CONFIG([$1], [variable="][$3]["], [$2])
-AS_VAR_COPY([$1], [pkg_cv_][$1])
-
-AS_VAR_IF([$1], [""], [$5], [$4])dnl
-])dnl PKG_CHECK_VAR

m4/pretty_print.m4

@@ -1,9 +0,0 @@
-AC_DEFUN([results], [
-	printf '('
-	if test x$[]enable_$1 = xyes; then
-		printf '+'
-	else
-		printf '-'
-	fi
-	printf '%s) ' "$2"
-])

m4/ucred.m4

@@ -1,18 +0,0 @@
-# Check if "struct ucred" is available.
-#
-# Author: Max Kellermann <max.kellermann@gmail.com>
-
-AC_DEFUN([STRUCT_UCRED],[
-	AC_MSG_CHECKING([for struct ucred])
-	AC_CACHE_VAL(mpd_cv_have_struct_ucred, [
-		AC_TRY_COMPILE([#include <sys/socket.h>],
-			[struct ucred cred;],
-			mpd_cv_have_struct_ucred=yes,
-			mpd_cv_have_struct_ucred=no)
-		])
-
-	AC_MSG_RESULT($mpd_cv_have_struct_ucred)
-	if test x$mpd_cv_have_struct_ucred = xyes; then
-		AC_DEFINE(HAVE_STRUCT_UCRED, 1, [Define if struct ucred is present from sys/socket.h])
-	fi
-])

meson.build

@@ -0,0 +1,560 @@
+project(
+  'mpd',
+  ['c', 'cpp'],
+  version: '0.22.6',
+  meson_version: '>= 0.49.0',
+  default_options: [
+    'c_std=c11',
+    'build.c_std=c11',
+    'cpp_std=c++17',
+    'build.cpp_std=c++17',
+    'warning_level=3',
+
+    # This is only here to build subprojects as static libraries; MPD
+    # itself doesn't ship any libraries.
+    'default_library=static',
+  ],
+  license: 'GPLv2+',
+)
+
+version_cxx = vcs_tag(input: 'src/GitVersion.cxx', output: 'GitVersion.cxx')
+
+compiler = meson.get_compiler('cpp')
+c_compiler = meson.get_compiler('c')
+
+if compiler.get_id() == 'gcc' and compiler.version().version_compare('<8')
+  warning('Your GCC version is too old.  You need at least version 8.')
+elif compiler.get_id() == 'clang' and compiler.version().version_compare('<5')
+  warning('Your clang version is too old.  You need at least version 5.')
+endif
+
+version_conf = configuration_data()
+version_conf.set_quoted('PACKAGE', meson.project_name())
+version_conf.set_quoted('PACKAGE_NAME', meson.project_name())
+version_conf.set_quoted('VERSION', meson.project_version())
+version_conf.set_quoted('PROTOCOL_VERSION', '0.22.4')
+configure_file(output: 'Version.h', configuration: version_conf)
+
+conf = configuration_data()
+conf.set_quoted('SYSTEM_CONFIG_FILE_LOCATION', join_paths(get_option('prefix'), get_option('sysconfdir'), 'mpd.conf'))
+
+common_cppflags = [
+  '-D_GNU_SOURCE',
+]
+
+common_cflags = [
+]
+
+common_cxxflags = [
+]
+
+test_common_flags = [
+  '-Wvla',
+  '-Wdouble-promotion',
+
+  '-fvisibility=hidden',
+
+  '-ffast-math',
+  '-ftree-vectorize',
+]
+
+test_cxxflags = test_common_flags + [
+  '-fno-threadsafe-statics',
+  '-fmerge-all-constants',
+
+  '-Wmissing-declarations',
+  '-Wshadow',
+  '-Wpointer-arith',
+  '-Wcast-qual',
+  '-Wwrite-strings',
+  '-Wsign-compare',
+  '-Wcomma',
+  '-Wextra-semi',
+  '-Wheader-hygiene',
+  '-Winconsistent-missing-destructor-override',
+  '-Wunreachable-code-break',
+  '-Wunused',
+  '-Wused-but-marked-unused',
+
+  '-Wno-non-virtual-dtor',
+]
+
+if compiler.get_id() == 'clang'
+  # Workaround for clang bug
+  # https://bugs.llvm.org/show_bug.cgi?id=32611
+  test_cxxflags += '-funwind-tables'
+endif
+
+test_cflags = test_common_flags + [
+  '-Wmissing-prototypes',
+  '-Wshadow',
+  '-Wpointer-arith',
+  '-Wstrict-prototypes',
+  '-Wcast-qual',
+  '-Wwrite-strings',
+  '-pedantic',
+]
+
+test_ldflags = [
+  # make relocations read-only (hardening)
+  '-Wl,-z,relro',
+
+  # no lazy binding, please - not worth it for a daemon
+  '-Wl,-z,now',
+]
+
+if get_option('buildtype') != 'debug'
+  test_cxxflags += [
+    '-ffunction-sections',
+    '-fdata-sections',
+  ]
+  test_cflags += [
+    '-ffunction-sections',
+    '-fdata-sections',
+  ]
+  test_ldflags += [
+    '-Wl,--gc-sections',
+  ]
+endif
+
+if get_option('fuzzer')
+  fuzzer_flags = ['-fsanitize=fuzzer,address,undefined']
+  add_global_arguments(fuzzer_flags, language: 'cpp')
+  add_global_arguments(fuzzer_flags, language: 'c')
+  add_global_link_arguments(fuzzer_flags, language: 'cpp')
+endif
+
+add_global_arguments(common_cxxflags + compiler.get_supported_arguments(test_cxxflags), language: 'cpp')
+add_global_arguments(common_cflags + c_compiler.get_supported_arguments(test_cflags), language: 'c')
+add_global_link_arguments(compiler.get_supported_link_arguments(test_ldflags), language: 'cpp')
+
+is_linux = host_machine.system() == 'linux'
+is_android = get_option('android_ndk') != ''
+is_darwin = host_machine.system() == 'darwin'
+is_windows = host_machine.system() == 'windows'
+is_haiku = host_machine.system() == 'haiku'
+
+if is_android
+  common_cppflags += '-DANDROID'
+endif
+
+if is_windows
+  common_cppflags += [
+    '-DWIN32_LEAN_AND_MEAN',
+    '-DWINVER=0x0600', '-D_WIN32_WINNT=0x0600',
+    '-DSTRICT',
+    '-DUNICODE', '-D_UNICODE',
+  ]
+
+  subdir('win32')
+endif
+
+if is_android
+  subdir('android')
+endif
+
+add_global_arguments(common_cppflags, language: 'c')
+add_global_arguments(common_cppflags, language: 'cpp')
+
+enable_daemon = not is_windows and not is_android and get_option('daemon')
+conf.set('ENABLE_DAEMON', enable_daemon)
+
+conf.set('HAVE_GETPWNAM_R', compiler.has_function('getpwnam_r'))
+conf.set('HAVE_GETPWUID_R', compiler.has_function('getpwuid_r'))
+conf.set('HAVE_INITGROUPS', compiler.has_function('initgroups'))
+conf.set('HAVE_FNMATCH', compiler.has_function('fnmatch'))
+
+# Explicitly exclude Windows in this check because
+# https://github.com/mesonbuild/meson/issues/3672 (reported in 2018,
+# still not fixed in 2020) causes Meson to believe it exists, because
+# __builtin_strndup() exists (but strndup() still cannot be used).
+conf.set('HAVE_STRNDUP', not is_windows and compiler.has_function('strndup', prefix: '#define _GNU_SOURCE\n#include <string.h>'))
+
+conf.set('HAVE_STRCASESTR', compiler.has_function('strcasestr'))
+
+conf.set('HAVE_PRCTL', is_linux)
+
+conf.set('USE_EVENTFD', is_linux and get_option('eventfd'))
+conf.set('USE_SIGNALFD', is_linux and get_option('signalfd'))
+
+if is_windows
+  conf.set('USE_WINSELECT', true)
+elif is_linux and get_option('epoll')
+  conf.set('USE_EPOLL', true)
+else
+  conf.set('USE_POLL', true)
+endif
+
+if not get_option('syslog').disabled()
+  if compiler.has_function('syslog')
+    conf.set('HAVE_SYSLOG', true)
+  elif get_option('syslog').enabled()
+    error('syslog() not found')
+  endif
+endif
+
+enable_database = get_option('database')
+conf.set('ENABLE_DATABASE', enable_database)
+
+enable_inotify = get_option('inotify') and is_linux and enable_database
+conf.set('ENABLE_INOTIFY', enable_inotify)
+
+conf.set('ENABLE_DSD', get_option('dsd'))
+
+inc = include_directories(
+  'src',
+
+  # for the generated config.h
+  '.',
+)
+
+boost_dep = dependency('boost', version: '>= 1.58')
+if boost_dep.version() == '1.67'
+  # https://github.com/MusicPlayerDaemon/MPD/pull/384
+  # https://github.com/boostorg/lockfree/commit/12726cda009a855073b9bedbdce57b6ce7763da2
+  warning('Your Boost version 1.67 is known to be buggy, and the MPD build will fail. Please upgrade to Boost 1.68 or later.')
+endif
+
+log = static_library(
+  'log',
+  'src/Log.cxx',
+  'src/LogBackend.cxx',
+  include_directories: inc,
+)
+
+log_dep = declare_dependency(
+  link_with: log,
+)
+
+sources = [
+  version_cxx,
+  'src/Main.cxx',
+  'src/protocol/ArgParser.cxx',
+  'src/protocol/Result.cxx',
+  'src/command/CommandError.cxx',
+  'src/command/AllCommands.cxx',
+  'src/command/QueueCommands.cxx',
+  'src/command/TagCommands.cxx',
+  'src/command/PlayerCommands.cxx',
+  'src/command/PlaylistCommands.cxx',
+  'src/command/FileCommands.cxx',
+  'src/command/OutputCommands.cxx',
+  'src/command/MessageCommands.cxx',
+  'src/command/ClientCommands.cxx',
+  'src/command/PartitionCommands.cxx',
+  'src/command/OtherCommands.cxx',
+  'src/command/CommandListBuilder.cxx',
+  'src/Idle.cxx',
+  'src/IdleFlags.cxx',
+  'src/decoder/Domain.cxx',
+  'src/decoder/Thread.cxx',
+  'src/decoder/Control.cxx',
+  'src/decoder/Bridge.cxx',
+  'src/decoder/DecoderPrint.cxx',
+  'src/client/Listener.cxx',
+  'src/client/Client.cxx',
+  'src/client/Config.cxx',
+  'src/client/Domain.cxx',
+  'src/client/Event.cxx',
+  'src/client/Expire.cxx',
+  'src/client/Idle.cxx',
+  'src/client/List.cxx',
+  'src/client/New.cxx',
+  'src/client/Process.cxx',
+  'src/client/Read.cxx',
+  'src/client/Write.cxx',
+  'src/client/Message.cxx',
+  'src/client/Subscribe.cxx',
+  'src/client/File.cxx',
+  'src/client/Response.cxx',
+  'src/client/ThreadBackgroundCommand.cxx',
+  'src/Listen.cxx',
+  'src/LogInit.cxx',
+  'src/ls.cxx',
+  'src/Instance.cxx',
+  'src/win32/Win32Main.cxx',
+  'src/MusicBuffer.cxx',
+  'src/MusicPipe.cxx',
+  'src/MusicChunk.cxx',
+  'src/MusicChunkPtr.cxx',
+  'src/Mapper.cxx',
+  'src/Partition.cxx',
+  'src/Permission.cxx',
+  'src/player/CrossFade.cxx',
+  'src/player/Thread.cxx',
+  'src/player/Control.cxx',
+  'src/PlaylistError.cxx',
+  'src/PlaylistPrint.cxx',
+  'src/PlaylistSave.cxx',
+  'src/playlist/PlaylistStream.cxx',
+  'src/playlist/PlaylistMapper.cxx',
+  'src/playlist/PlaylistAny.cxx',
+  'src/playlist/PlaylistSong.cxx',
+  'src/playlist/PlaylistQueue.cxx',
+  'src/playlist/Print.cxx',
+  'src/db/PlaylistVector.cxx',
+  'src/queue/Queue.cxx',
+  'src/queue/QueuePrint.cxx',
+  'src/queue/QueueSave.cxx',
+  'src/queue/Playlist.cxx',
+  'src/queue/PlaylistControl.cxx',
+  'src/queue/PlaylistEdit.cxx',
+  'src/queue/PlaylistTag.cxx',
+  'src/queue/PlaylistState.cxx',
+  'src/ReplayGainGlobal.cxx',
+  'src/LocateUri.cxx',
+  'src/SongUpdate.cxx',
+  'src/SongLoader.cxx',
+  'src/SongPrint.cxx',
+  'src/SongSave.cxx',
+  'src/StateFile.cxx',
+  'src/StateFileConfig.cxx',
+  'src/Stats.cxx',
+  'src/TagPrint.cxx',
+  'src/TagSave.cxx',
+  'src/TagFile.cxx',
+  'src/TagStream.cxx',
+  'src/TagAny.cxx',
+  'src/TimePrint.cxx',
+  'src/mixer/Volume.cxx',
+  'src/PlaylistFile.cxx',
+]
+
+if not is_android
+  sources += [
+    'src/CommandLine.cxx',
+    'src/unix/SignalHandlers.cxx',
+  ]
+else
+  sources += [
+    'src/android/Context.cxx',
+    'src/android/AudioManager.cxx',
+    'src/android/Environment.cxx',
+    'src/android/LogListener.cxx',
+  ]
+endif
+
+if enable_daemon
+  sources += 'src/unix/Daemon.cxx'
+endif
+
+if enable_database
+  sources += [
+    'src/queue/PlaylistUpdate.cxx',
+    'src/command/StorageCommands.cxx',
+    'src/command/DatabaseCommands.cxx',
+  ]
+endif
+
+subdir('src/util')
+subdir('src/time')
+subdir('src/io')
+subdir('src/io/uring')
+subdir('src/system')
+subdir('src/thread')
+subdir('src/net')
+subdir('src/event')
+
+subdir('src/apple')
+
+subdir('src/lib/dbus')
+subdir('src/lib/icu')
+subdir('src/lib/smbclient')
+subdir('src/lib/zlib')
+
+subdir('src/lib/alsa')
+subdir('src/lib/chromaprint')
+subdir('src/lib/curl')
+subdir('src/lib/expat')
+subdir('src/lib/ffmpeg')
+subdir('src/lib/gcrypt')
+subdir('src/lib/nfs')
+subdir('src/lib/oss')
+subdir('src/lib/pcre')
+subdir('src/lib/pulse')
+subdir('src/lib/sndio')
+subdir('src/lib/sqlite')
+subdir('src/lib/systemd')
+subdir('src/lib/upnp')
+subdir('src/lib/yajl')
+
+subdir('src/lib/crypto')
+
+subdir('src/fs')
+subdir('src/config')
+subdir('src/tag')
+subdir('src/pcm')
+subdir('src/neighbor')
+subdir('src/input')
+subdir('src/archive')
+subdir('src/filter')
+subdir('src/mixer')
+subdir('src/output')
+subdir('src/lib/xiph')
+subdir('src/decoder')
+subdir('src/encoder')
+subdir('src/song')
+subdir('src/playlist')
+subdir('src/zeroconf')
+
+if curl_dep.found()
+  sources += 'src/RemoteTagCache.cxx'
+endif
+
+if sqlite_dep.found()
+  sources += [
+    'src/command/StickerCommands.cxx',
+    'src/sticker/Database.cxx',
+    'src/sticker/Print.cxx',
+    'src/sticker/SongSticker.cxx',
+  ]
+endif
+
+if chromaprint_dep.found()
+  sources += [
+    'src/command/FingerprintCommands.cxx',
+    'src/lib/chromaprint/DecoderClient.cxx',
+  ]
+endif
+
+basic = static_library(
+  'basic',
+  'src/ReplayGainInfo.cxx',
+  'src/ReplayGainMode.cxx',
+  'src/SingleMode.cxx',
+  include_directories: inc,
+)
+
+basic_dep = declare_dependency(
+  link_with: basic,
+)
+
+if enable_database
+  subdir('src/storage')
+else
+  storage_glue_dep = dependency('', required: false)
+endif
+subdir('src/db')
+
+if neighbor_glue_dep.found()
+  sources += 'src/command/NeighborCommands.cxx'
+endif
+
+if archive_glue_dep.found()
+  sources += [
+    'src/TagArchive.cxx',
+  ]
+
+  if enable_database
+    sources += ['src/db/update/Archive.cxx']
+  endif
+endif
+
+if is_windows
+  sources += windows_resources
+endif
+
+link_args = []
+more_deps = []
+if is_android
+  subdir('src/java')
+  target_type = 'shared_library'
+  target_name = 'mpd'
+  link_args += [
+    '-Wl,--no-undefined,-shared,-Bsymbolic',
+    '-llog',
+    '-lz',
+  ]
+  more_deps += [
+    declare_dependency(sources: [classes_jar]),
+    java_dep,
+  ]
+elif is_haiku
+  target_type = 'executable'
+  target_name = 'mpd.nores'
+  link_args += [
+    '-lnetwork',
+    '-lbe',
+  ]
+else
+  target_type = 'executable'
+  target_name = 'mpd'
+endif
+
+mpd = build_target(
+  target_name,
+  sources,
+  target_type: target_type,
+  include_directories: inc,
+  dependencies: [
+    basic_dep,
+    config_dep,
+    dbus_dep,
+    fs_dep,
+    net_dep,
+    util_dep,
+    event_dep,
+    thread_dep,
+    neighbor_glue_dep,
+    input_glue_dep,
+    archive_glue_dep,
+    output_glue_dep,
+    mixer_glue_dep,
+    decoder_glue_dep,
+    encoder_glue_dep,
+    playlist_glue_dep,
+    db_glue_dep,
+    storage_glue_dep,
+    song_dep,
+    systemd_dep,
+    sqlite_dep,
+    zeroconf_dep,
+    more_deps,
+    chromaprint_dep,
+  ],
+  link_args: link_args,
+  build_by_default: not get_option('fuzzer'),
+  install: not is_android and not is_haiku,
+)
+
+if is_android
+  subdir('android/apk')
+endif
+
+if is_haiku
+  subdir('src/haiku')
+  custom_target(
+    'mpd',
+    output: 'mpd',
+    input: [mpd, rsrc],
+    command: [addres, '@OUTPUT@', '@INPUT0@', '@INPUT1@'],
+    install: true,
+    install_dir: get_option('bindir'),
+  )
+endif
+
+configure_file(output: 'config.h', configuration: conf)
+
+if systemd_dep.found()
+  subdir('systemd')
+endif
+
+install_data(
+  'mpd.svg',
+  install_dir: join_paths(get_option('datadir'), 'icons', 'hicolor', 'scalable', 'apps'),
+)
+
+install_data(
+  'AUTHORS', 'COPYING', 'NEWS', 'README.md',
+  install_dir: join_paths(get_option('datadir'), 'doc', meson.project_name()),
+)
+
+subdir('doc')
+
+if get_option('test')
+  subdir('test')
+endif
+
+if get_option('fuzzer')
+  subdir('test/fuzzer')
+endif

meson_options.txt

@@ -0,0 +1,199 @@
+option('documentation', type: 'feature', description: 'Build documentation')
+option('html_manual', type: 'boolean', value: true, description: 'Build the HTML manual')
+option('manpages', type: 'boolean', value: true, description: 'Build manual pages')
+
+option('syslog', type: 'feature', description: 'syslog support')
+option('inotify', type: 'boolean', value: true, description: 'inotify support (for automatic database update)')
+option('io_uring', type: 'feature', description: 'Linux io_uring support using liburing')
+
+option('daemon', type: 'boolean', value: true, description: 'enable daemonization')
+option('systemd', type: 'feature', description: 'systemd support')
+
+option('systemd_system_unit_dir', type: 'string', description: 'systemd system service directory')
+option('systemd_user_unit_dir', type: 'string', description: 'systemd user service directory')
+
+#
+# Options for developers
+#
+
+option('test', type: 'boolean', value: false, description: 'Build the unit tests and debug programs')
+option('fuzzer', type: 'boolean', value: false, description: 'Build fuzzers (requires libFuzzer)')
+
+#
+# Android
+#
+
+option('android_sdk', type: 'string', description: 'The path where Android SDK is installed')
+option('android_ndk', type: 'string', description: 'The path where Android NDK is installed')
+option('android_abi', type: 'string', value: 'armeabi-v7a', description: 'The Android ABI to be built')
+
+option('android_strip', type: 'string', value: 'strip', description: 'The "strip" tool from the NDK')
+
+option('android_debug_keystore', type: 'string', description: 'The keystore file used to sign debug APK files')
+
+option('android_keystore', type: 'string', description: 'The keystore file used to sign APK files')
+option('android_keyalias', type: 'string', description: 'The key alias used to sign APK files')
+option('android_keypass', type: 'string', description: 'The password of the keystore used to sign APK files')
+
+#
+# System call support
+#
+
+option('epoll', type: 'boolean', value: true, description: 'Use epoll on Linux')
+option('eventfd', type: 'boolean', value: true, description: 'Use eventfd() on Linux')
+option('signalfd', type: 'boolean', value: true, description: 'Use signalfd() on Linux')
+
+#
+# Network support
+#
+
+option('tcp', type: 'boolean', value: true, description: 'Support for clients connecting via TCP')
+option('ipv6', type: 'feature', description: 'Support for IPv6')
+option('local_socket', type: 'boolean', value: true, description: 'Support for clients connecting via local sockets')
+
+#
+# Audio formats
+#
+
+option('dsd', type: 'boolean', value: true, description: 'Support the DSD audio format')
+
+#
+# Database plugins
+#
+
+option('database', type: 'boolean', value: true, description: 'enable support for the music database')
+option('upnp', type: 'feature', description: 'UPnP client support')
+option('libmpdclient', type: 'feature', description: 'libmpdclient support (for the proxy database plugin)')
+
+#
+# Neighbor plugins
+#
+
+option('neighbor', type: 'boolean', value: true, description: 'enable support for neighbor discovery')
+
+#
+# Storage plugins
+#
+
+option('udisks', type: 'feature', description: 'Support for removable media using udisks2')
+option('webdav', type: 'feature', description: 'WebDAV support using CURL and Expat')
+
+#
+# Playlist plugins
+#
+
+option('cue', type: 'boolean', value: true, description: 'CUE sheet support')
+
+#
+# Input plugins
+#
+
+option('cdio_paranoia', type: 'feature', description: 'libcdio_paranoia input plugin')
+option('curl', type: 'feature', description: 'HTTP client using CURL')
+option('mms', type: 'feature', description: 'MMS protocol support using libmms')
+option('nfs', type: 'feature', description: 'NFS protocol support using libnfs')
+
+# The "smbclient" plugin is disabled by default because libsmbclient
+# has a serious bug which crashes MPD very quickly:
+# https://bugzilla.samba.org/show_bug.cgi?id=11413
+option('smbclient', type: 'feature', value: 'disabled', description: 'SMB support using libsmbclient')
+
+#
+# Commercial services
+#
+
+option('qobuz', type: 'feature', description: 'Qobuz client')
+option('soundcloud', type: 'feature', description: 'SoundCloud client')
+option('tidal', type: 'feature', description: 'Tidal client')
+
+#
+# Archive plugins
+#
+
+option('bzip2', type: 'feature', description: 'bzip2 support using libbz2')
+option('iso9660', type: 'feature', description: 'ISO9660 support using libiso9660')
+option('zzip', type: 'feature', description: 'ZIP support using zziplib')
+
+#
+# Tag plugins
+#
+
+option('id3tag', type: 'feature', description: 'ID3 support using libid3tag')
+option('chromaprint', type: 'feature', description: 'ChromaPrint / AcoustID support')
+
+#
+# Decoder plugins
+#
+
+option('adplug', type: 'feature', description: 'AdPlug decoder plugin')
+option('audiofile', type: 'feature', description: 'libaudiofile decoder plugin')
+option('faad', type: 'feature', description: 'AAC decoder using libfaad')
+option('ffmpeg', type: 'feature', description: 'FFmpeg codec support')
+option('flac', type: 'feature', description: 'FLAC decoder plugin')
+option('fluidsynth', type: 'feature', description: 'fluidsynth MIDI decoder plugin')
+option('gme', type: 'feature', description: 'Game Music Emulator decoder plugin')
+option('mad', type: 'feature', description: 'MP3 decoder using libmad')
+option('mikmod', type: 'feature', description: 'MikMod decoder plugin')
+option('modplug', type: 'feature', description: 'Modplug decoder plugin')
+option('mpcdec', type: 'feature', description: 'Musepack decoder plugin')
+option('mpg123', type: 'feature', description: 'MP3 decoder using libmpg123')
+option('opus', type: 'feature', description: 'Opus decoder plugin')
+option('sidplay', type: 'feature', description: 'C64 SID support via libsidplayfp or libsidplay2')
+option('sndfile', type: 'feature', description: 'libsndfile decoder plugin')
+option('tremor', type: 'feature', description: 'Fixed-point vorbis decoder plugin')
+option('vorbis', type: 'feature', description: 'Vorbis decoder plugin')
+option('wavpack', type: 'feature', description: 'WavPack decoder plugin')
+option('wildmidi', type: 'feature', description: 'WildMidi decoder plugin')
+
+#
+# Encoder plugins
+#
+
+option('vorbisenc', type: 'feature', description: 'Vorbis encoder plugin')
+option('lame', type: 'feature', description: 'LAME MP3 encoder plugin')
+option('twolame', type: 'feature', description: 'TwoLAME MP2 encoder plugin')
+option('shine', type: 'feature', description: 'shine MP3 encoder plugin')
+option('wave_encoder', type: 'boolean', value: true, description: 'PCM wave encoder encoder plugin')
+
+#
+# Filter plugins
+#
+
+option('libsamplerate', type: 'feature', description: 'libsamplerate resampler')
+option('soxr', type: 'feature', description: 'libsoxr resampler')
+
+#
+# Output plugins
+#
+
+option('alsa', type: 'feature', description: 'ALSA support')
+option('ao', type: 'feature', description: 'libao output plugin')
+option('fifo', type: 'boolean', value: true, description: 'FIFO output plugin')
+option('httpd', type: 'boolean', value: true, description: 'HTTP streaming output plugin')
+option('jack', type: 'feature', description: 'JACK output plugin')
+option('openal', type: 'feature', description: 'OpenAL output plugin')
+option('oss', type: 'feature', description: 'Open Sound System support')
+option('pipe', type: 'boolean', value: true, description: 'Pipe output plugin')
+option('pulse', type: 'feature', description: 'PulseAudio support')
+option('recorder', type: 'boolean', value: true, description: 'Recorder output plugin')
+option('shout', type: 'feature', description: 'Shoutcast streaming support using libshout')
+option('sndio', type: 'feature', description: 'sndio output plugin')
+option('solaris_output', type: 'feature', description: 'Solaris /dev/audio support')
+
+#
+# Misc libraries
+#
+
+option('dbus', type: 'feature', description: 'D-Bus support')
+option('expat', type: 'feature', description: 'Expat XML support')
+option('icu', type: 'feature', description: 'Use libicu for Unicode')
+option('iconv', type: 'feature', description: 'Use iconv() for character set conversion')
+option('pcre', type: 'feature', description: 'Enable regular expression support (using libpcre)')
+option('sqlite', type: 'feature', description: 'SQLite database support (for stickers)')
+option('yajl', type: 'feature', description: 'libyajl for YAML support')
+option('zlib', type: 'feature', description: 'zlib support (for database compression)')
+
+option('zeroconf', type: 'combo',
+       choices: ['auto', 'avahi', 'bonjour', 'disabled'],
+       value: 'auto',
+       description: 'Zeroconf support')

python/build/cmake.py

@@ -0,0 +1,45 @@
+import subprocess
+
+from build.project import Project
+
+def configure(toolchain, src, build, args=()):
+    cross_args = []
+
+    if toolchain.is_windows:
+        cross_args.append('-DCMAKE_SYSTEM_NAME=Windows')
+        cross_args.append('-DCMAKE_RC_COMPILER=' + toolchain.windres)
+
+    configure = [
+        'cmake',
+        src,
+
+        '-DCMAKE_INSTALL_PREFIX=' + toolchain.install_prefix,
+        '-DCMAKE_BUILD_TYPE=release',
+
+        '-DCMAKE_C_COMPILER=' + toolchain.cc,
+        '-DCMAKE_CXX_COMPILER=' + toolchain.cxx,
+
+        '-DCMAKE_C_FLAGS=' + toolchain.cflags + ' ' + toolchain.cppflags,
+        '-DCMAKE_CXX_FLAGS=' + toolchain.cxxflags + ' ' + toolchain.cppflags,
+
+        '-GNinja',
+    ] + cross_args + args
+
+    subprocess.check_call(configure, env=toolchain.env, cwd=build)
+
+class CmakeProject(Project):
+    def __init__(self, url, md5, installed, configure_args=[],
+                 **kwargs):
+        Project.__init__(self, url, md5, installed, **kwargs)
+        self.configure_args = configure_args
+
+    def configure(self, toolchain):
+        src = self.unpack(toolchain)
+        build = self.make_build_path(toolchain)
+        configure(toolchain, src, build, self.configure_args)
+        return build
+
+    def build(self, toolchain):
+        build = self.configure(toolchain)
+        subprocess.check_call(['ninja', 'install'],
+                              cwd=build, env=toolchain.env)

python/build/cmdline.py

@@ -1,29 +0,0 @@
-def concatenate_cmdline_variables(src, names):
-    """Find duplicate variable declarations on the given source list, and
-    concatenate the values of those in the 'names' list."""
-
-    # the result list being constructed
-    dest = []
-
-    # a map of variable name to destination list index
-    positions = {}
-
-    for item in src:
-        i = item.find('=')
-        if i > 0:
-            # it's a variable
-            name = item[:i]
-            if name in names:
-                # it's a known variable
-                if name in positions:
-                    # already specified: concatenate instead of
-                    # appending it
-                    dest[positions[name]] += ' ' + item[i + 1:]
-                    continue
-                else:
-                    # not yet seen: append it and remember the list
-                    # index
-                    positions[name] = len(dest)
-        dest.append(item)
-
-    return dest

python/build/ffmpeg.py

@@ -10,17 +10,14 @@ class FfmpegProject(Project):
         self.configure_args = configure_args
         self.cppflags = cppflags
 
-    def _filter_cflags(self, flags):
-        # FFmpeg expects the GNU as syntax
-        flags = flags.replace(' -integrated-as ', ' -no-integrated-as ')
-        return flags
-
     def build(self, toolchain):
         src = self.unpack(toolchain)
         build = self.make_build_path(toolchain)
 
         if toolchain.is_arm:
             arch = 'arm'
+        elif toolchain.is_aarch64:
+            arch = 'aarch64'
         else:
             arch = 'x86'
 
@@ -34,8 +31,8 @@ class FfmpegProject(Project):
             '--cc=' + toolchain.cc,
             '--cxx=' + toolchain.cxx,
             '--nm=' + toolchain.nm,
-            '--extra-cflags=' + self._filter_cflags(toolchain.cflags) + ' ' + toolchain.cppflags + ' ' + self.cppflags,
-            '--extra-cxxflags=' + self._filter_cflags(toolchain.cxxflags) + ' ' + toolchain.cppflags + ' ' + self.cppflags,
+            '--extra-cflags=' + toolchain.cflags + ' ' + toolchain.cppflags + ' ' + self.cppflags,
+            '--extra-cxxflags=' + toolchain.cxxflags + ' ' + toolchain.cppflags + ' ' + self.cppflags,
             '--extra-ldflags=' + toolchain.ldflags,
             '--extra-libs=' + toolchain.libs,
             '--ar=' + toolchain.ar,

python/build/libs.py

@@ -3,13 +3,22 @@ from os.path import abspath
 
 from build.project import Project
 from build.zlib import ZlibProject
+from build.meson import MesonProject
+from build.cmake import CmakeProject
 from build.autotools import AutotoolsProject
 from build.ffmpeg import FfmpegProject
+from build.openssl import OpenSSLProject
 from build.boost import BoostProject
 
+libmpdclient = MesonProject(
+    'https://www.musicpd.org/download/libmpdclient/2/libmpdclient-2.19.tar.xz',
+    '158aad4c2278ab08e76a3f2b0166c99b39fae00ee17231bd225c5a36e977a189',
+    'lib/libmpdclient.a',
+)
+
 libogg = AutotoolsProject(
-    'http://downloads.xiph.org/releases/ogg/libogg-1.3.3.tar.xz',
-    '4f3fc6178a533d392064f14776b23c397ed4b9f48f5de297aba73b643f955c08',
+    'http://downloads.xiph.org/releases/ogg/libogg-1.3.4.tar.xz',
+    'c163bc12bc300c401b6aa35907ac682671ea376f13ae0969a220f7ddf71893fe',
     'lib/libogg.a',
     [
         '--disable-shared', '--enable-static',
@@ -17,17 +26,22 @@ libogg = AutotoolsProject(
 )
 
 libvorbis = AutotoolsProject(
-    'http://downloads.xiph.org/releases/vorbis/libvorbis-1.3.5.tar.xz',
-    '28cb28097c07a735d6af56e598e1c90f',
+    'http://downloads.xiph.org/releases/vorbis/libvorbis-1.3.7.tar.xz',
+    'b33cc4934322bcbf6efcbacf49e3ca01aadbea4114ec9589d1b1e9d20f72954b',
     'lib/libvorbis.a',
     [
         '--disable-shared', '--enable-static',
     ],
+
+    edits={
+        # this option is not understood by clang
+        'configure': lambda data: data.replace('-mno-ieee-fp', ' '),
+    }
 )
 
 opus = AutotoolsProject(
-    'https://archive.mozilla.org/pub/opus/opus-1.2.1.tar.gz',
-    'cfafd339ccd9c5ef8d6ab15d7e1a412c054bf4cb4ecbbbcc78c12ef2def70732',
+    'https://archive.mozilla.org/pub/opus/opus-1.3.1.tar.gz',
+    '65b58e1e25b2a114157014736a3d9dfeaad8d41be1c8179866f144a2fb44ff9d',
     'lib/libopus.a',
     [
         '--disable-shared', '--enable-static',
@@ -40,8 +54,8 @@ opus = AutotoolsProject(
 )
 
 flac = AutotoolsProject(
-    'http://downloads.xiph.org/releases/flac/flac-1.3.2.tar.xz',
-    '91cfc3ed61dc40f47f050a109b08610667d73477af6ef36dcad31c31a4a8d53f',
+    'http://downloads.xiph.org/releases/flac/flac-1.3.3.tar.xz',
+    '213e82bd716c9de6db2f98bcadbc4c24c7e2efe8c75939a1a84e28539c4e1748',
     'lib/libFLAC.a',
     [
         '--disable-shared', '--enable-static',
@@ -99,9 +113,44 @@ liblame = AutotoolsProject(
     ],
 )
 
+libmodplug = AutotoolsProject(
+    'https://downloads.sourceforge.net/modplug-xmms/libmodplug/0.8.9.0/libmodplug-0.8.9.0.tar.gz',
+    '457ca5a6c179656d66c01505c0d95fafaead4329b9dbaa0f997d00a3508ad9de',
+    'lib/libmodplug.a',
+    [
+        '--disable-shared', '--enable-static',
+    ],
+)
+
+wildmidi = CmakeProject(
+    'https://codeload.github.com/Mindwerks/wildmidi/tar.gz/wildmidi-0.4.3',
+    '498e5a96455bb4b91b37188ad6dcb070824e92c44f5ed452b90adbaec8eef3c5',
+    'lib/libWildMidi.a',
+    [
+        '-DBUILD_SHARED_LIBS=OFF',
+        '-DWANT_PLAYER=OFF',
+        '-DWANT_STATIC=ON',
+    ],
+    base='wildmidi-wildmidi-0.4.3',
+    name='wildmidi',
+    version='0.4.3',
+)
+
+gme = CmakeProject(
+    'https://bitbucket.org/mpyne/game-music-emu/downloads/game-music-emu-0.6.3.tar.xz',
+    'aba34e53ef0ec6a34b58b84e28bf8cfbccee6585cebca25333604c35db3e051d',
+    'lib/libgme.a',
+    [
+        '-DBUILD_SHARED_LIBS=OFF',
+        '-DENABLE_UBSAN=OFF',
+        '-DZLIB_INCLUDE_DIR=OFF',
+        '-DSDL2_DIR=OFF',
+    ],
+)
+
 ffmpeg = FfmpegProject(
-    'http://ffmpeg.org/releases/ffmpeg-3.4.2.tar.xz',
-    '2b92e9578ef8b3e49eeab229e69305f5f4cbc1fdaa22e927fc7fca18acccd740',
+    'http://ffmpeg.org/releases/ffmpeg-4.3.1.tar.xz',
+    'ad009240d46e307b4e03a213a0f49c11b650e445b1f8be0dda2a9212b34d2ffb',
     'lib/libavcodec.a',
     [
         '--disable-shared', '--enable-static',
@@ -328,9 +377,15 @@ ffmpeg = FfmpegProject(
     ],
 )
 
+openssl = OpenSSLProject(
+    'https://www.openssl.org/source/openssl-3.0.0-alpha10.tar.gz',
+    'b1699acf2148db31f12edf5ebfdf12a92bfd3f0e60538d169710408a3cd3b138',
+    'include/openssl/ossl_typ.h',
+)
+
 curl = AutotoolsProject(
-    'http://curl.haxx.se/download/curl-7.58.0.tar.xz',
-    '6a813875243609eb75f37fa72044e4ad618b55ec15a4eafdac2df6a7e800e3e3',
+    'http://curl.haxx.se/download/curl-7.74.0.tar.xz',
+    '999d5f2c403cf6e25d58319fdd596611e455dd195208746bc6e6d197a77e878b',
     'lib/libcurl.a',
     [
         '--disable-shared', '--enable-static',
@@ -346,15 +401,33 @@ curl = AutotoolsProject(
         '--disable-manual',
         '--disable-threaded-resolver', '--disable-verbose', '--disable-sspi',
         '--disable-crypto-auth', '--disable-ntlm-wb', '--disable-tls-srp', '--disable-cookies',
-        '--without-ssl', '--without-gnutls', '--without-nss', '--without-libssh2',
+        '--disable-doh',
+        '--disable-mime',
+        '--disable-netrc',
+        '--disable-progress-meter',
+        '--disable-alt-svc',
+        '--without-gnutls', '--without-nss', '--without-libssh2',
+
+        # native Windows SSL/TLS support, option ignored on non-Windows builds
+        '--with-schannel',
     ],
 
     patches='src/lib/curl/patches',
 )
 
+libexpat = AutotoolsProject(
+    'https://github.com/libexpat/libexpat/releases/download/R_2_2_9/expat-2.2.9.tar.bz2',
+    'f1063084dc4302a427dabcca499c8312b3a32a29b7d2506653ecc8f950a9a237',
+    'lib/libexpat.a',
+    [
+        '--disable-shared', '--enable-static',
+        '--without-docbook',
+    ],
+)
+
 libnfs = AutotoolsProject(
-    'https://github.com/sahlberg/libnfs/archive/libnfs-2.0.0.tar.gz',
-    '7ea6cd8fa6c461d01091e584d424d28e137d23ff4b65b95d01a3fd0ef95d120e',
+    'https://github.com/sahlberg/libnfs/archive/libnfs-4.0.0.tar.gz',
+    '6ee77e9fe220e2d3e3b1f53cfea04fb319828cc7dbb97dd9df09e46e901d797d',
     'lib/libnfs.a',
     [
         '--disable-shared', '--enable-static',
@@ -362,13 +435,16 @@ libnfs = AutotoolsProject(
 
         # work around -Wtautological-compare
         '--disable-werror',
+
+        '--disable-utils', '--disable-examples',
     ],
-    base='libnfs-libnfs-2.0.0',
+    base='libnfs-libnfs-4.0.0',
+    patches='src/lib/nfs/patches',
     autoreconf=True,
 )
 
 boost = BoostProject(
-    'http://downloads.sourceforge.net/project/boost/boost/1.66.0/boost_1_66_0.tar.bz2',
-    '5721818253e6a0989583192f96782c4a98eb6204965316df9f5ad75819225ca9',
+    'https://dl.bintray.com/boostorg/release/1.75.0/source/boost_1_75_0.tar.bz2',
+    '953db31e016db7bb207f11432bef7df100516eeb746843fa0486a222e3fd49cb',
     'include/boost/version.hpp',
 )

python/build/meson.py

@@ -0,0 +1,116 @@
+import os.path, subprocess, sys
+
+from build.project import Project
+
+def make_cross_file(toolchain):
+    if toolchain.is_windows:
+        system = 'windows'
+        windres = "windres = '%s'" % toolchain.windres
+    else:
+        system = 'linux'
+        windres = ''
+
+    if toolchain.is_arm:
+        cpu_family = 'arm'
+        if toolchain.is_armv7:
+            cpu = 'armv7'
+        else:
+            cpu = 'armv6'
+    elif toolchain.is_aarch64:
+        cpu_family = 'aarch64'
+        cpu = 'arm64-v8a'
+    else:
+        cpu_family = 'x86'
+        if 'x86_64' in toolchain.arch:
+            cpu = 'x86_64'
+        else:
+            cpu = 'i686'
+
+    # TODO: support more CPUs
+    endian = 'little'
+
+    # TODO: write pkg-config wrapper
+
+    path = os.path.join(toolchain.build_path, 'meson.cross')
+    os.makedirs(toolchain.build_path, exist_ok=True)
+    with open(path, 'w') as f:
+        f.write("""
+[binaries]
+c = '%s'
+cpp = '%s'
+ar = '%s'
+strip = '%s'
+pkgconfig = '%s'
+%s
+
+[properties]
+root = '%s'
+
+c_args = %s
+c_link_args = %s
+
+cpp_args = %s
+cpp_link_args = %s
+
+# Keep Meson from executing Android-x86 test binariees
+needs_exe_wrapper = true
+
+[host_machine]
+system = '%s'
+cpu_family = '%s'
+cpu = '%s'
+endian = '%s'
+            """ % (toolchain.cc, toolchain.cxx, toolchain.ar, toolchain.strip,
+                   toolchain.pkg_config,
+                   windres,
+                   toolchain.install_prefix,
+                   repr((toolchain.cppflags + ' ' + toolchain.cflags).split()),
+                   repr(toolchain.ldflags.split() + toolchain.libs.split()),
+                   repr((toolchain.cppflags + ' ' + toolchain.cxxflags).split()),
+                   repr(toolchain.ldflags.split() + toolchain.libs.split()),
+                   system, cpu_family, cpu, endian))
+    return path
+
+def configure(toolchain, src, build, args=()):
+    cross_file = make_cross_file(toolchain)
+    configure = [
+        'meson',
+        src, build,
+
+        '--prefix', toolchain.install_prefix,
+
+        # this is necessary because Meson uses Debian's build machine
+        # MultiArch path (e.g. "lib/x86_64-linux-gnu") for cross
+        # builds, which is obviously wrong
+        '--libdir', 'lib',
+
+        '--buildtype', 'plain',
+
+        '--default-library=static',
+
+        '--cross-file', cross_file,
+    ] + args
+
+    env = toolchain.env.copy()
+
+    # Meson 0.54 requires the BOOST_ROOT environment variable
+    env['BOOST_ROOT'] = toolchain.install_prefix
+
+    subprocess.check_call(configure, env=env)
+
+class MesonProject(Project):
+    def __init__(self, url, md5, installed, configure_args=[],
+                 **kwargs):
+        Project.__init__(self, url, md5, installed, **kwargs)
+        self.configure_args = configure_args
+
+    def configure(self, toolchain):
+        src = self.unpack(toolchain)
+        build = self.make_build_path(toolchain)
+        configure(toolchain, src, build, self.configure_args)
+        return build
+
+    def build(self, toolchain):
+        build = self.configure(toolchain)
+        subprocess.check_call(['ninja', 'install'],
+                              cwd=build, env=toolchain.env)

python/build/openssl.py

@@ -0,0 +1,55 @@
+import subprocess
+
+from build.makeproject import MakeProject
+
+class OpenSSLProject(MakeProject):
+    def __init__(self, url, md5, installed,
+                 **kwargs):
+        MakeProject.__init__(self, url, md5, installed, install_target='install_dev', **kwargs)
+
+    def get_make_args(self, toolchain):
+        return MakeProject.get_make_args(self, toolchain) + [
+            'CC=' + toolchain.cc,
+            'CFLAGS=' + toolchain.cflags,
+            'CPPFLAGS=' + toolchain.cppflags,
+            'AR=' + toolchain.ar,
+            'RANLIB=' + toolchain.ranlib,
+            'build_libs',
+        ]
+
+    def build(self, toolchain):
+        src = self.unpack(toolchain, out_of_tree=False)
+
+        # OpenSSL has a weird target architecture scheme with lots of
+        # hard-coded architectures; this table translates between our
+        # "toolchain_arch" (HOST_TRIPLET) and the OpenSSL target
+        openssl_archs = {
+            # not using "android-*" because those OpenSSL targets want
+            # to know where the SDK is, but our own build scripts
+            # prepared everything already to look like a regular Linux
+            # build
+            'arm-linux-androideabi': 'linux-generic32',
+            'aarch64-linux-android': 'linux-aarch64',
+            'i686-linux-android': 'linux-x86-clang',
+            'x86_64-linux-android': 'linux-x86_64-clang',
+
+            # Kobo
+            'arm-linux-gnueabihf': 'linux-generic32',
+
+            # Windows
+            'i686-w64-mingw32': 'mingw',
+            'x86_64-w64-mingw32': 'mingw64',
+        }
+
+        openssl_arch = openssl_archs[toolchain.arch]
+
+        subprocess.check_call(['./Configure',
+                               'no-shared',
+                               'no-module', 'no-engine', 'no-static-engine',
+                               'no-async',
+                               'no-tests',
+                               'no-asm', # "asm" causes build failures on Windows
+                               openssl_arch,
+                               '--prefix=' + toolchain.install_prefix],
+                              cwd=src, env=toolchain.env)
+        MakeProject.build(self, toolchain, src)

python/build/project.py

@@ -20,7 +20,7 @@ class Project:
             self.base = base
 
         if name is None or version is None:
-            m = re.match(r'^([-\w]+)-(\d[\d.]*[a-z]?[\d.]*)$', self.base)
+            m = re.match(r'^([-\w]+)-(\d[\d.]*[a-z]?[\d.]*(?:-alpha\d+)?)$', self.base)
             if name is None: name = m.group(1)
             if version is None: version = m.group(2)
 

python/build/tar.py

@@ -7,5 +7,11 @@ def untar(tarball_path, parent_path, base):
     except FileNotFoundError:
         pass
     os.makedirs(parent_path, exist_ok=True)
-    subprocess.check_call(['/bin/tar', 'xfC', tarball_path, parent_path])
+    try:
+        subprocess.check_call(['/bin/tar', 'xfC', tarball_path, parent_path])
+    except FileNotFoundError:
+        import tarfile
+        tar = tarfile.open(tarball_path)
+        tar.extractall(path=parent_path)
+        tar.close()
     return path

python/build/zlib.py

@@ -18,5 +18,5 @@ class ZlibProject(Project):
             'INCLUDE_PATH='+ os.path.join(toolchain.install_prefix, 'include'),
             'LIBRARY_PATH=' + os.path.join(toolchain.install_prefix, 'lib'),
             'BINARY_PATH=' + os.path.join(toolchain.install_prefix, 'bin'),
-            'SHARED_MODE=1'],
+            ],
             cwd=src, env=toolchain.env)

scripts/check_config_h.rb

@@ -1,47 +0,0 @@
-#!/usr/bin/env ruby
-#
-# This script verifies that every source includes config.h first.
-# This is very important for consistent Large File Support.
-#
-
-def check_file(file)
-    first = true
-    file.each_line do |line|
-        if line =~ /^\#include\s+(\S+)/ then
-            if $1 == '"config.h"'
-                unless first
-                    puts "#{file.path}: config.h included too late"
-                end
-            else
-                if first
-                    puts "#{file.path}: config.h missing"
-                end
-            end
-            first = false
-        end
-    end
-end
-
-def check_path(path)
-    File.open(path) do |file|
-        check_file(file)
-    end
-end
-
-if ARGV.empty?
-    Dir["src/*.c"].each do |path|
-        check_path(path)
-    end
-
-    Dir["src/*/*.c"].each do |path|
-        check_path(path)
-    end
-
-    Dir["test/*.c"].each do |path|
-        check_path(path)
-    end
-else
-    ARGV.each do |path|
-        check_path(path)
-    end
-end

src/BulkEdit.hxx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify

src/Chrono.hxx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -24,13 +24,14 @@
 #include <utility>
 #include <cstdint>
 
+using FloatDuration = std::chrono::duration<double>;
+
 /**
  * A time stamp within a song.  Granularity is 1 millisecond and the
  * maximum value is about 49 days.
  */
 class SongTime : public std::chrono::duration<std::uint32_t, std::milli> {
 	typedef std::chrono::duration<std::uint32_t, std::milli> Base;
-	typedef Base::rep rep;
 
 public:
 	SongTime() = default;
@@ -42,6 +43,11 @@ public:
 		return SongTime(Base::zero());
 	}
 
+	template<typename D>
+	static constexpr SongTime Cast(D src) {
+		return SongTime(std::chrono::duration_cast<Base>(src));
+	}
+
 	static constexpr SongTime FromS(unsigned s) {
 		return SongTime(rep(s) * 1000);
 	}
@@ -89,7 +95,7 @@ public:
 
 	constexpr double ToDoubleS() const {
 		return double(count()) / 1000.;
-	};
+	}
 
 	constexpr bool IsZero() const {
 		return count() == 0;
@@ -114,7 +120,6 @@ public:
  */
 class SignedSongTime : public std::chrono::duration<std::int32_t, std::milli> {
 	typedef std::chrono::duration<std::int32_t, std::milli> Base;
-	typedef Base::rep rep;
 
 public:
 	SignedSongTime() = default;
@@ -138,6 +143,11 @@ public:
 		return SignedSongTime(-1);
 	}
 
+	template<typename D>
+	static constexpr SongTime Cast(D src) {
+		return SongTime(std::chrono::duration_cast<Base>(src));
+	}
+
 	static constexpr SignedSongTime FromS(int s) {
 		return SignedSongTime(rep(s) * 1000);
 	}
@@ -189,7 +199,7 @@ public:
 
 	constexpr double ToDoubleS() const {
 		return double(count()) / 1000.;
-	};
+	}
 
 	constexpr bool IsZero() const {
 		return count() == 0;

src/CommandLine.cxx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -19,10 +19,11 @@
 
 #include "config.h"
 #include "CommandLine.hxx"
+#include "GitVersion.hxx"
 #include "ls.hxx"
 #include "LogInit.hxx"
 #include "Log.hxx"
-#include "config/ConfigGlobal.hxx"
+#include "config/File.hxx"
 #include "decoder/DecoderList.hxx"
 #include "decoder/DecoderPlugin.hxx"
 #include "output/Registry.hxx"
@@ -32,15 +33,19 @@
 #include "playlist/PlaylistRegistry.hxx"
 #include "playlist/PlaylistPlugin.hxx"
 #include "fs/AllocatedPath.hxx"
+#include "fs/NarrowPath.hxx"
 #include "fs/Traits.hxx"
 #include "fs/FileSystem.hxx"
 #include "fs/StandardDirectory.hxx"
-#include "system/Error.hxx"
-#include "util/Macros.hxx"
-#include "util/RuntimeError.hxx"
+#include "io/uring/Features.h"
 #include "util/Domain.hxx"
 #include "util/OptionDef.hxx"
 #include "util/OptionParser.hxx"
+#include "Version.h"
+
+#ifdef _WIN32
+#include "system/Error.hxx"
+#endif
 
 #ifdef ENABLE_DATABASE
 #include "db/Registry.hxx"
@@ -54,6 +59,7 @@
 #include "neighbor/NeighborPlugin.hxx"
 #endif
 
+#include "encoder/Features.h"
 #ifdef ENABLE_ENCODER
 #include "encoder/EncoderList.hxx"
 #include "encoder/EncoderPlugin.hxx"
@@ -64,55 +70,56 @@
 #include "archive/ArchivePlugin.hxx"
 #endif
 
-#include <stdio.h>
-#include <stdlib.h>
-
+namespace {
 #ifdef _WIN32
-#define CONFIG_FILE_LOCATION PATH_LITERAL("mpd\\mpd.conf")
-#define APP_CONFIG_FILE_LOCATION PATH_LITERAL("conf\\mpd.conf")
+constexpr auto CONFIG_FILE_LOCATION = Path::FromFS(PATH_LITERAL("mpd\\mpd.conf"));
+constexpr auto APP_CONFIG_FILE_LOCATION = Path::FromFS(PATH_LITERAL("conf\\mpd.conf"));
 #else
-#define USER_CONFIG_FILE_LOCATION1 PATH_LITERAL(".mpdconf")
-#define USER_CONFIG_FILE_LOCATION2 PATH_LITERAL(".mpd/mpd.conf")
-#define USER_CONFIG_FILE_LOCATION_XDG PATH_LITERAL("mpd/mpd.conf")
+constexpr auto USER_CONFIG_FILE_LOCATION1 = Path::FromFS(PATH_LITERAL(".mpdconf"));
+constexpr auto USER_CONFIG_FILE_LOCATION2 = Path::FromFS(PATH_LITERAL(".mpd/mpd.conf"));
+constexpr auto USER_CONFIG_FILE_LOCATION_XDG = Path::FromFS(PATH_LITERAL("mpd/mpd.conf"));
 #endif
+} // namespace
 
-static constexpr OptionDef opt_kill(
-	"kill", "kill the currently running mpd session");
-static constexpr OptionDef opt_no_config(
-	"no-config", "don't read from config");
-static constexpr OptionDef opt_no_daemon(
-	"no-daemon", "don't detach from console");
-static constexpr OptionDef opt_stdout(
-	"stdout", nullptr); // hidden, compatibility with old versions
-static constexpr OptionDef opt_stderr(
-	"stderr", "print messages to stderr");
-static constexpr OptionDef opt_verbose(
-	"verbose", 'v', "verbose logging");
-static constexpr OptionDef opt_version(
-	"version", 'V', "print version number");
-static constexpr OptionDef opt_help(
-	"help", 'h', "show help options");
-static constexpr OptionDef opt_help_alt(
-	nullptr, '?', nullptr); // hidden, standard alias for --help
+enum Option {
+	OPTION_KILL,
+	OPTION_NO_CONFIG,
+	OPTION_NO_DAEMON,
+	OPTION_STDOUT,
+	OPTION_STDERR,
+	OPTION_VERBOSE,
+	OPTION_VERSION,
+	OPTION_HELP,
+	OPTION_HELP2,
+};
+
+static constexpr OptionDef option_defs[] = {
+	{"kill", "kill the currently running mpd session"},
+	{"no-config", "don't read from config"},
+	{"no-daemon", "don't detach from console"},
+	{"stdout", nullptr}, // hidden, compatibility with old versions
+	{"stderr", "print messages to stderr"},
+	{"verbose", 'v', "verbose logging"},
+	{"version", 'V', "print version number"},
+	{"help", 'h', "show help options"},
+	{nullptr, '?', nullptr}, // hidden, standard alias for --help
+};
 
 static constexpr Domain cmdline_domain("cmdline");
 
-gcc_noreturn
-static void version(void)
+[[noreturn]]
+static void version()
 {
-	printf("Music Player Daemon " VERSION
-#ifdef GIT_COMMIT
-	       " (" GIT_COMMIT ")"
-#endif
+	printf("Music Player Daemon " VERSION " (%s)"
 	       "\n"
-	       "\n"
-	       "Copyright (C) 2003-2007 Warren Dukes <warren.dukes@gmail.com>\n"
-	       "Copyright 2008-2017 Max Kellermann <max.kellermann@gmail.com>\n"
+	       "Copyright 2003-2007 Warren Dukes <warren.dukes@gmail.com>\n"
+	       "Copyright 2008-2018 Max Kellermann <max.kellermann@gmail.com>\n"
 	       "This is free software; see the source for copying conditions.  There is NO\n"
-	       "warranty; not even MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
+	       "warranty; not even MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n",
+	       GIT_VERSION);
 
 #ifdef ENABLE_DATABASE
-	       "\n"
+	printf("\n"
 	       "Database plugins:\n");
 
 	for (auto i = database_plugins; *i != nullptr; ++i)
@@ -124,31 +131,35 @@ static void version(void)
 	for (auto i = storage_plugins; *i != nullptr; ++i)
 		printf(" %s", (*i)->name);
 
-	printf("\n"
+	printf("\n");
 #endif
 
 #ifdef ENABLE_NEIGHBOR_PLUGINS
-	       "\n"
+	printf("\n"
 	       "Neighbor plugins:\n");
 	for (auto i = neighbor_plugins; *i != nullptr; ++i)
 		printf(" %s", (*i)->name);
 
-	printf("\n"
 #endif
 
+	printf("\n"
 	       "\n"
 	       "Decoders plugins:\n");
 
 	decoder_plugins_for_each([](const DecoderPlugin &plugin){
-			printf(" [%s]", plugin.name);
+		printf(" [%s]", plugin.name);
 
-			const char *const*suffixes = plugin.suffixes;
-			if (suffixes != nullptr)
-				for (; *suffixes != nullptr; ++suffixes)
-					printf(" %s", *suffixes);
+		const char *const*suffixes = plugin.suffixes;
+		if (suffixes != nullptr)
+			for (; *suffixes != nullptr; ++suffixes)
+				printf(" %s", *suffixes);
 
-			printf("\n");
-		});
+		if (plugin.protocols != nullptr)
+			for (const auto &i : plugin.protocols())
+				printf(" %s", i.c_str());
+
+		printf("\n");
+	});
 
 	printf("\n"
 	       "Filters:\n"
@@ -195,7 +206,15 @@ static void version(void)
 #endif
 
 	       "\n"
-	       "Input plugins:\n");
+	       "Input plugins:\n"
+	       " file"
+#ifdef HAVE_URING
+	       " io_uring"
+#endif
+#ifdef ENABLE_ARCHIVE
+	       " archive"
+#endif
+	       );
 	input_plugins_for_each(plugin)
 		printf(" %s", plugin->name);
 
@@ -213,6 +232,12 @@ static void version(void)
 #ifdef HAVE_AVAHI
 	       " avahi"
 #endif
+#ifdef ENABLE_DBUS
+	       " dbus"
+#endif
+#ifdef ENABLE_UDISKS
+	       " udisks"
+#endif
 #ifdef USE_EPOLL
 	       " epoll"
 #endif
@@ -239,7 +264,7 @@ static void version(void)
 #endif
 	       "\n");
 
-	exit(EXIT_SUCCESS);
+	std::exit(EXIT_SUCCESS);
 }
 
 static void PrintOption(const OptionDef &opt)
@@ -255,8 +280,8 @@ static void PrintOption(const OptionDef &opt)
 		       opt.GetDescription());
 }
 
-gcc_noreturn
-static void help(void)
+[[noreturn]]
+static void help()
 {
 	printf("Usage:\n"
 	       "  mpd [OPTION...] [path/to/mpd.conf]\n"
@@ -265,89 +290,85 @@ static void help(void)
 	       "\n"
 	       "Options:\n");
 
-	PrintOption(opt_help);
-	PrintOption(opt_kill);
-	PrintOption(opt_no_config);
-	PrintOption(opt_no_daemon);
-	PrintOption(opt_stderr);
-	PrintOption(opt_verbose);
-	PrintOption(opt_version);
+	for (const auto &i : option_defs)
+		if(i.HasDescription()) // hide hidden options from help print
+			PrintOption(i);
 
-	exit(EXIT_SUCCESS);
+	std::exit(EXIT_SUCCESS);
 }
 
 class ConfigLoader
 {
+	ConfigData &config;
+
 public:
-	bool TryFile(const Path path);
-	bool TryFile(const AllocatedPath &base_path,
-		     PathTraitsFS::const_pointer_type path);
+	explicit ConfigLoader(ConfigData &_config) noexcept
+		:config(_config) {}
+
+	bool TryFile(Path path);
+	bool TryFile(const AllocatedPath &base_path, Path path);
 };
 
 bool ConfigLoader::TryFile(Path path)
 {
 	if (FileExists(path)) {
-		ReadConfigFile(path);
+		ReadConfigFile(config, path);
 		return true;
 	}
 	return false;
 }
 
-bool ConfigLoader::TryFile(const AllocatedPath &base_path,
-			   PathTraitsFS::const_pointer_type path)
+bool ConfigLoader::TryFile(const AllocatedPath &base_path, Path path)
 {
 	if (base_path.IsNull())
 		return false;
-	auto full_path = AllocatedPath::Build(base_path, path);
+	auto full_path = base_path / path;
 	return TryFile(full_path);
 }
 
 void
-ParseCommandLine(int argc, char **argv, struct options *options)
+ParseCommandLine(int argc, char **argv, struct options &options,
+		 ConfigData &config)
 {
 	bool use_config_file = true;
-	options->kill = false;
-	options->daemon = true;
-	options->log_stderr = false;
-	options->verbose = false;
 
 	// First pass: handle command line options
-	OptionParser parser(argc, argv);
-	while (parser.HasEntries()) {
-		if (!parser.ParseNext())
-			continue;
-		if (parser.CheckOption(opt_kill)) {
-			options->kill = true;
-			continue;
-		}
-		if (parser.CheckOption(opt_no_config)) {
-			use_config_file = false;
-			continue;
-		}
-		if (parser.CheckOption(opt_no_daemon)) {
-			options->daemon = false;
-			continue;
-		}
-		if (parser.CheckOption(opt_stderr, opt_stdout)) {
-			options->log_stderr = true;
-			continue;
-		}
-		if (parser.CheckOption(opt_verbose)) {
-			options->verbose = true;
-			continue;
-		}
-		if (parser.CheckOption(opt_version))
-			version();
-		if (parser.CheckOption(opt_help, opt_help_alt))
-			help();
+	OptionParser parser(option_defs, argc, argv);
+	while (auto o = parser.Next()) {
+		switch (Option(o.index)) {
+		case OPTION_KILL:
+			options.kill = true;
+			break;
 
-		throw FormatRuntimeError("invalid option: %s",
-					 parser.GetOption());
+		case OPTION_NO_CONFIG:
+			use_config_file = false;
+			break;
+
+		case OPTION_NO_DAEMON:
+			options.daemon = false;
+			break;
+
+		case OPTION_STDOUT:
+		case OPTION_STDERR:
+			options.log_stderr = true;
+			break;
+
+		case OPTION_VERBOSE:
+			options.verbose = true;
+			break;
+
+		case OPTION_VERSION:
+			version();
+
+		case OPTION_HELP:
+		case OPTION_HELP2:
+			help();
+		}
 	}
 
 	/* initialize the logging library, so the configuration file
 	   parser can use it already */
-	log_early_init(options->verbose);
+	log_early_init(options.verbose);
 
 	if (!use_config_file) {
 		LogDebug(cmdline_domain,
@@ -357,11 +378,9 @@ ParseCommandLine(int argc, char **argv, struct options *options)
 
 	// Second pass: find non-option parameters (i.e. config file)
 	const char *config_file = nullptr;
-	for (int i = 1; i < argc; ++i) {
-		if (OptionParser::IsOption(argv[i]))
-			continue;
+	for (const char *i : parser.GetRemaining()) {
 		if (config_file == nullptr) {
-			config_file = argv[i];
+			config_file = i;
 			continue;
 		}
 
@@ -370,23 +389,13 @@ ParseCommandLine(int argc, char **argv, struct options *options)
 
 	if (config_file != nullptr) {
 		/* use specified configuration file */
-#ifdef _UNICODE
-		wchar_t buffer[MAX_PATH];
-		auto result = MultiByteToWideChar(CP_ACP, 0, config_file, -1,
-						  buffer, ARRAY_SIZE(buffer));
-		if (result <= 0)
-			throw MakeLastError("MultiByteToWideChar() failed");
-
-		ReadConfigFile(Path::FromFS(buffer));
-#else
-		ReadConfigFile(Path::FromFS(config_file));
-#endif
+		ReadConfigFile(config, FromNarrowPath(config_file));
 		return;
 	}
 
 	/* use default configuration file path */
 
-	ConfigLoader loader;
+	ConfigLoader loader(config);
 
 	bool found =
 #ifdef _WIN32

src/CommandLine.hxx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -20,14 +20,17 @@
 #ifndef MPD_COMMAND_LINE_HXX
 #define MPD_COMMAND_LINE_HXX
 
+struct ConfigData;
+
 struct options {
-	bool kill;
-	bool daemon;
-	bool log_stderr;
-	bool verbose;
+	bool kill = false;
+	bool daemon = true;
+	bool log_stderr = false;
+	bool verbose = false;
 };
 
 void
-ParseCommandLine(int argc, char **argv, struct options *options);
+ParseCommandLine(int argc, char **argv, struct options &options,
+		 ConfigData &config);
 
 #endif

src/GitVersion.cxx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -17,8 +17,6 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include "config.h"
-#include "Mutex.hxx"
-#include "thread/Mutex.hxx"
+#include "GitVersion.hxx"
 
-Mutex smbclient_mutex;
+const char GIT_VERSION[] = "@VCS_TAG@";

src/GitVersion.hxx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -17,9 +17,9 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#ifndef MPD_OUTPUT_CONTROL_HXX
-#define MPD_OUTPUT_CONTROL_HXX
+#ifndef MPD_GIT_VERSION_HXX
+#define MPD_GIT_VERSION_HXX
 
-struct AudioOutput;
+extern const char GIT_VERSION[];
 
 #endif

src/IOThread.cxx

@@ -1,119 +0,0 @@
-/*
- * Copyright 2003-2017 The Music Player Daemon Project
- * http://www.musicpd.org
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#include "config.h"
-#include "IOThread.hxx"
-#include "thread/Mutex.hxx"
-#include "thread/Cond.hxx"
-#include "thread/Thread.hxx"
-#include "thread/Name.hxx"
-#include "event/Loop.hxx"
-
-#include <assert.h>
-
-static struct IOThread {
-	Mutex mutex;
-	Cond cond;
-
-	EventLoop *loop;
-	Thread thread;
-
-	IOThread():thread(BIND_THIS_METHOD(Run)) {}
-
-private:
-	void Run() noexcept;
-} io;
-
-void
-io_thread_run(void)
-{
-	assert(io_thread_inside());
-	assert(io.loop != nullptr);
-
-	io.loop->Run();
-}
-
-inline void
-IOThread::Run() noexcept
-{
-	SetThreadName("io");
-
-	/* lock+unlock to synchronize with io_thread_start(), to be
-	   sure that io.thread is set */
-	mutex.lock();
-	mutex.unlock();
-
-	io_thread_run();
-}
-
-void
-io_thread_init(void)
-{
-	assert(io.loop == nullptr);
-	assert(!io.thread.IsDefined());
-
-	io.loop = new EventLoop();
-}
-
-void
-io_thread_start()
-{
-	assert(io.loop != nullptr);
-	assert(!io.thread.IsDefined());
-
-	const std::lock_guard<Mutex> protect(io.mutex);
-	io.thread.Start();
-}
-
-void
-io_thread_quit(void)
-{
-	assert(io.loop != nullptr);
-
-	io.loop->Break();
-}
-
-void
-io_thread_deinit(void)
-{
-	if (io.thread.IsDefined()) {
-		io_thread_quit();
-		io.thread.Join();
-	}
-
-	delete io.loop;
-}
-
-EventLoop &
-io_thread_get() noexcept
-{
-	assert(io.loop != nullptr);
-
-	return *io.loop;
-}
-
-#ifndef NDEBUG
-
-bool
-io_thread_inside() noexcept
-{
-	return io.thread.IsInside();
-}
-
-#endif

src/IcyMetaDataParser.cxx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -17,21 +17,28 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include "config.h"
 #include "IcyMetaDataParser.hxx"
-#include "tag/Tag.hxx"
-#include "tag/TagBuilder.hxx"
-#include "util/Domain.hxx"
+#include "tag/Builder.hxx"
+#include "util/AllocatedString.hxx"
 #include "util/StringView.hxx"
-#include "Log.hxx"
 
-#include <assert.h>
+#include <algorithm>
+#include <cassert>
+
 #include <string.h>
 
-static constexpr Domain icy_metadata_domain("icy_metadata");
+#ifdef HAVE_ICU_CONVERTER
 
 void
-IcyMetaDataParser::Reset()
+IcyMetaDataParser::SetCharset(const char *charset)
+{
+	icu_converter = IcuConverter::Create(charset);
+}
+
+#endif
+
+void
+IcyMetaDataParser::Reset() noexcept
 {
 	if (!IsDefined())
 		return;
@@ -39,14 +46,14 @@ IcyMetaDataParser::Reset()
 	if (data_rest == 0 && meta_size > 0)
 		delete[] meta_data;
 
-	delete tag;
+	tag.reset();
 
 	data_rest = data_size;
 	meta_size = 0;
 }
 
 size_t
-IcyMetaDataParser::Data(size_t length)
+IcyMetaDataParser::Data(size_t length) noexcept
 {
 	assert(length > 0);
 
@@ -66,28 +73,40 @@ IcyMetaDataParser::Data(size_t length)
 }
 
 static void
-icy_add_item(TagBuilder &tag, TagType type, const char *value)
+icy_add_item(TagBuilder &tag, TagType type, StringView value) noexcept
 {
-	size_t length = strlen(value);
-
-	if (length >= 2 && value[0] == '\'' && value[length - 1] == '\'') {
+	if (value.size >= 2 && value.front() == '\'' && value.back() == '\'') {
 		/* strip the single quotes */
-		++value;
-		length -= 2;
+		++value.data;
+		value.size -= 2;
 	}
 
-	if (length > 0)
-		tag.AddItem(type, {value, length});
+	if (value.size > 0)
+		tag.AddItem(type, value);
 }
 
 static void
-icy_parse_tag_item(TagBuilder &tag, const char *name, const char *value)
+icy_parse_tag_item(TagBuilder &tag,
+#ifdef HAVE_ICU_CONVERTER
+		   const IcuConverter *icu_converter,
+#endif
+		   const char *name, const char *value) noexcept
 {
-	if (strcmp(name, "StreamTitle") == 0)
+	if (strcmp(name, "StreamTitle") == 0) {
+#ifdef HAVE_ICU_CONVERTER
+		if (icu_converter != nullptr) {
+			try {
+				icy_add_item(tag, TAG_TITLE,
+					     icu_converter->ToUTF8(value).c_str());
+			} catch (...) {
+			}
+
+			return;
+		}
+#endif
+
 		icy_add_item(tag, TAG_TITLE, value);
-	else
-		FormatDebug(icy_metadata_domain,
-			    "unknown icy-tag: '%s'", name);
+	}
 }
 
 /**
@@ -96,7 +115,7 @@ icy_parse_tag_item(TagBuilder &tag, const char *name, const char *value)
  * that also fails, return #end.
  */
 static char *
-find_end_quote(char *p, char *const end)
+find_end_quote(char *p, char *const end) noexcept
 {
 	char *fallback = std::find(p, end, '\'');
 	if (fallback >= end - 1 || fallback[1] == ';')
@@ -115,8 +134,12 @@ find_end_quote(char *p, char *const end)
 	}
 }
 
-static Tag *
-icy_parse_tag(char *p, char *const end)
+static std::unique_ptr<Tag>
+icy_parse_tag(
+#ifdef HAVE_ICU_CONVERTER
+	      const IcuConverter *icu_converter,
+#endif
+	      char *p, char *const end) noexcept
 {
 	assert(p != nullptr);
 	assert(end != nullptr);
@@ -153,7 +176,11 @@ icy_parse_tag(char *p, char *const end)
 		*quote = 0;
 		p = quote + 1;
 
-		icy_parse_tag_item(tag, name, value);
+		icy_parse_tag_item(tag,
+#ifdef HAVE_ICU_CONVERTER
+				   icu_converter,
+#endif
+				   name, value);
 
 		char *semicolon = std::find(p, end, ';');
 		if (semicolon == end)
@@ -165,9 +192,9 @@ icy_parse_tag(char *p, char *const end)
 }
 
 size_t
-IcyMetaDataParser::Meta(const void *data, size_t length)
+IcyMetaDataParser::Meta(const void *data, size_t length) noexcept
 {
-	const unsigned char *p = (const unsigned char *)data;
+	const auto *p = (const unsigned char *)data;
 
 	assert(IsDefined());
 	assert(data_rest == 0);
@@ -208,9 +235,11 @@ IcyMetaDataParser::Meta(const void *data, size_t length)
 	if (meta_position == meta_size) {
 		/* parse */
 
-		delete tag;
-
-		tag = icy_parse_tag(meta_data, meta_data + meta_size);
+		tag = icy_parse_tag(
+#ifdef HAVE_ICU_CONVERTER
+				    icu_converter.get(),
+#endif
+				    meta_data, meta_data + meta_size);
 		delete[] meta_data;
 
 		/* change back to normal data mode */
@@ -223,9 +252,9 @@ IcyMetaDataParser::Meta(const void *data, size_t length)
 }
 
 size_t
-IcyMetaDataParser::ParseInPlace(void *data, size_t length)
+IcyMetaDataParser::ParseInPlace(void *data, size_t length) noexcept
 {
-	uint8_t *const dest0 = (uint8_t *)data;
+	auto *const dest0 = (uint8_t *)data;
 	uint8_t *dest = dest0;
 	const uint8_t *src = dest0;
 

src/IcyMetaDataParser.hxx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -20,29 +20,42 @@
 #ifndef MPD_ICY_META_DATA_PARSER_HXX
 #define MPD_ICY_META_DATA_PARSER_HXX
 
-#include <stddef.h>
+#include "lib/icu/Converter.hxx"
+#include "tag/Tag.hxx"
+#include "config.h"
 
-struct Tag;
+#include <cstddef>
+#include <memory>
 
 class IcyMetaDataParser {
-	size_t data_size, data_rest;
+	size_t data_size = 0, data_rest;
 
 	size_t meta_size, meta_position;
 	char *meta_data;
 
-	Tag *tag;
+#ifdef HAVE_ICU_CONVERTER
+	std::unique_ptr<IcuConverter> icu_converter;
+#endif
+
+	std::unique_ptr<Tag> tag;
 
 public:
-	IcyMetaDataParser():data_size(0) {}
-	~IcyMetaDataParser() {
+	~IcyMetaDataParser() noexcept {
 		Reset();
 	}
 
+#ifdef HAVE_ICU_CONVERTER
+	/**
+	 * Throws on error.
+	 */
+	void SetCharset(const char *charset);
+#endif
+
 	/**
 	 * Initialize an enabled icy_metadata object with the specified
 	 * data_size (from the icy-metaint HTTP response header).
 	 */
-	void Start(size_t _data_size) {
+	void Start(size_t _data_size) noexcept {
 		data_size = data_rest = _data_size;
 		meta_size = 0;
 		tag = nullptr;
@@ -51,12 +64,12 @@ public:
 	/**
 	 * Resets the icy_metadata.  Call this after rewinding the stream.
 	 */
-	void Reset();
+	void Reset() noexcept;
 
 	/**
 	 * Checks whether the icy_metadata object is enabled.
 	 */
-	bool IsDefined() const {
+	bool IsDefined() const noexcept {
 		return data_size > 0;
 	}
 
@@ -66,26 +79,24 @@ public:
 	 * return value is smaller than "length", the caller should invoke
 	 * icy_meta().
 	 */
-	size_t Data(size_t length);
+	size_t Data(size_t length) noexcept;
 
 	/**
 	 * Reads metadata from the stream.  Returns the number of bytes
 	 * consumed.  If the return value is smaller than "length", the caller
 	 * should invoke icy_data().
 	 */
-	size_t Meta(const void *data, size_t length);
+	size_t Meta(const void *data, size_t length) noexcept;
 
 	/**
 	 * Parse data and eliminate metadata.
 	 *
 	 * @return the number of data bytes remaining in the buffer
 	 */
-	size_t ParseInPlace(void *data, size_t length);
+	size_t ParseInPlace(void *data, size_t length) noexcept;
 
-	Tag *ReadTag() {
-		Tag *result = tag;
-		tag = nullptr;
-		return result;
+	std::unique_ptr<Tag> ReadTag() noexcept {
+		return std::exchange(tag, nullptr);
 	}
 };
 

src/Idle.cxx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -22,17 +22,16 @@
  *
  */
 
-#include "config.h"
 #include "Idle.hxx"
 #include "Main.hxx"
 #include "Instance.hxx"
 
-#include <assert.h>
+#include <cassert>
 
 void
 idle_add(unsigned flags)
 {
 	assert(flags != 0);
 
-	instance->EmitIdle(flags);
+	global_instance->EmitIdle(flags);
 }

src/Idle.hxx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify

src/IdleFlags.cxx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -22,11 +22,10 @@
  *
  */
 
-#include "config.h"
 #include "IdleFlags.hxx"
 #include "util/ASCII.hxx"
 
-#include <assert.h>
+#include <cassert>
 
 static const char *const idle_names[] = {
 	"database",
@@ -42,6 +41,7 @@ static const char *const idle_names[] = {
 	"message",
 	"neighbor",
 	"mount",
+	"partition",
 	nullptr
 };
 

src/IdleFlags.hxx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -25,7 +25,7 @@
 #ifndef MPD_IDLE_FLAGS_HXX
 #define MPD_IDLE_FLAGS_HXX
 
-#include "Compiler.h"
+#include "util/Compiler.h"
 
 /** song database has been updated*/
 static constexpr unsigned IDLE_DATABASE = 0x1;
@@ -67,6 +67,9 @@ static constexpr unsigned IDLE_NEIGHBOR = 0x800;
 /** the mount list has changed */
 static constexpr unsigned IDLE_MOUNT = 0x1000;
 
+/** the partition list has changed */
+static constexpr unsigned IDLE_PARTITION = 0x2000;
+
 /**
  * Get idle names
  */

src/Instance.cxx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -20,19 +20,86 @@
 #include "config.h"
 #include "Instance.hxx"
 #include "Partition.hxx"
-#include "Idle.hxx"
+#include "IdleFlags.hxx"
+#include "StateFile.hxx"
 #include "Stats.hxx"
+#include "client/List.hxx"
+#include "input/cache/Manager.hxx"
+
+#ifdef ENABLE_CURL
+#include "RemoteTagCache.hxx"
+#include "util/UriExtract.hxx"
+#endif
 
 #ifdef ENABLE_DATABASE
 #include "db/DatabaseError.hxx"
+#include "db/Interface.hxx"
+#include "db/update/Service.hxx"
+#include "storage/StorageInterface.hxx"
+
+#ifdef ENABLE_NEIGHBOR_PLUGINS
+#include "neighbor/Glue.hxx"
+#endif
 
 #ifdef ENABLE_SQLITE
-#include "sticker/StickerDatabase.hxx"
+#include "sticker/Database.hxx"
 #include "sticker/SongSticker.hxx"
 #endif
 #endif
 
-#include <stdexcept>
+Instance::Instance()
+	:rtio_thread(true),
+#ifdef ENABLE_SYSTEMD_DAEMON
+	 systemd_watchdog(event_loop),
+#endif
+	 idle_monitor(event_loop, BIND_THIS_METHOD(OnIdle))
+{
+}
+
+Instance::~Instance() noexcept
+{
+#ifdef ENABLE_DATABASE
+	delete update;
+
+	if (database != nullptr) {
+		database->Close();
+		database.reset();
+	}
+
+	delete storage;
+#endif
+}
+
+void
+Instance::OnStateModified() noexcept
+{
+	if (state_file)
+		state_file->CheckModified();
+}
+
+Partition *
+Instance::FindPartition(const char *name) noexcept
+{
+	for (auto &partition : partitions)
+		if (partition.name == name)
+			return &partition;
+
+	return nullptr;
+}
+
+void
+Instance::DeletePartition(Partition &partition) noexcept
+{
+	// TODO: use boost::intrusive::list to avoid this loop
+	for (auto i = partitions.begin();; ++i) {
+		assert(i != partitions.end());
+
+		if (&*i == &partition) {
+			partitions.erase(i);
+			break;
+		}
+	}
+}
 
 #ifdef ENABLE_DATABASE
 
@@ -47,32 +114,35 @@ Instance::GetDatabaseOrThrow() const
 }
 
 void
-Instance::OnDatabaseModified()
+Instance::OnDatabaseModified() noexcept
 {
 	assert(database != nullptr);
 
 	/* propagate the change to all subsystems */
 
 	stats_invalidate();
-	partition->DatabaseModified(*database);
+
+	for (auto &partition : partitions)
+		partition.DatabaseModified(*database);
 }
 
 void
-Instance::OnDatabaseSongRemoved(const char *uri)
+Instance::OnDatabaseSongRemoved(const char *uri) noexcept
 {
 	assert(database != nullptr);
 
 #ifdef ENABLE_SQLITE
 	/* if the song has a sticker, remove it */
-	if (sticker_enabled()) {
+	if (HasStickerDatabase()) {
 		try {
-			sticker_song_delete(uri);
-		} catch (const std::runtime_error &) {
+			sticker_song_delete(*sticker_database, uri);
+		} catch (...) {
 		}
 	}
 #endif
 
-	partition->StaleSong(uri);
+	for (auto &partition : partitions)
+		partition.StaleSong(uri);
 }
 
 #endif
@@ -80,15 +150,58 @@ Instance::OnDatabaseSongRemoved(const char *uri)
 #ifdef ENABLE_NEIGHBOR_PLUGINS
 
 void
-Instance::FoundNeighbor(gcc_unused const NeighborInfo &info)
+Instance::FoundNeighbor([[maybe_unused]] const NeighborInfo &info) noexcept
 {
-	partition->EmitIdle(IDLE_NEIGHBOR);
+	EmitIdle(IDLE_NEIGHBOR);
 }
 
 void
-Instance::LostNeighbor(gcc_unused const NeighborInfo &info)
+Instance::LostNeighbor([[maybe_unused]] const NeighborInfo &info) noexcept
 {
-	partition->EmitIdle(IDLE_NEIGHBOR);
+	EmitIdle(IDLE_NEIGHBOR);
 }
 
 #endif
+
+#ifdef ENABLE_CURL
+
+void
+Instance::LookupRemoteTag(const char *uri) noexcept
+{
+	if (!uri_has_scheme(uri))
+		return;
+
+	if (!remote_tag_cache)
+		remote_tag_cache = std::make_unique<RemoteTagCache>(event_loop,
+								    *this);
+
+	remote_tag_cache->Lookup(uri);
+}
+
+void
+Instance::OnRemoteTag(const char *uri, const Tag &tag) noexcept
+{
+	if (!tag.IsDefined())
+		/* boring */
+		return;
+
+	for (auto &partition : partitions)
+		partition.TagModified(uri, tag);
+}
+
+#endif
+
+void
+Instance::OnIdle(unsigned flags) noexcept
+{
+	/* broadcast to all partitions */
+	for (auto &partition : partitions)
+		partition.EmitIdle(flags);
+}
+
+void
+Instance::FlushCaches() noexcept
+{
+	if (input_cache)
+		input_cache->Flush();
+}

src/Instance.hxx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -20,10 +20,19 @@
 #ifndef MPD_INSTANCE_HXX
 #define MPD_INSTANCE_HXX
 
-#include "check.h"
+#include "config.h"
 #include "event/Loop.hxx"
+#include "event/Thread.hxx"
 #include "event/MaskMonitor.hxx"
-#include "Compiler.h"
+#include "util/Compiler.h"
+
+#ifdef ENABLE_SYSTEMD_DAEMON
+#include "lib/systemd/Watchdog.hxx"
+#endif
+
+#ifdef ENABLE_CURL
+#include "RemoteTagCacheHandler.hxx"
+#endif
 
 #ifdef ENABLE_NEIGHBOR_PLUGINS
 #include "neighbor/Listener.hxx"
@@ -32,14 +41,20 @@ class NeighborGlue;
 
 #ifdef ENABLE_DATABASE
 #include "db/DatabaseListener.hxx"
-class Database;
+#include "db/Ptr.hxx"
 class Storage;
 class UpdateService;
 #endif
 
+#include <memory>
+#include <list>
+
 class ClientList;
 struct Partition;
 class StateFile;
+class RemoteTagCache;
+class StickerDatabase;
+class InputCacheManager;
 
 /**
  * A utility class which, when used as the first base class, ensures
@@ -63,15 +78,41 @@ struct Instance final
 #ifdef ENABLE_NEIGHBOR_PLUGINS
 	public NeighborListener
 #endif
+#ifdef ENABLE_CURL
+	, public RemoteTagCacheHandler
+#endif
 {
+	/**
+	 * A thread running an #EventLoop for non-blocking (bulk) I/O.
+	 */
+	EventThread io_thread;
+
+	/**
+	 * Another thread running an #EventLoop for non-blocking
+	 * (real-time) I/O.  This is used instead of #io_thread for
+	 * events which require low latency, e.g. for filling hardware
+	 * ring buffers.
+	 */
+	EventThread rtio_thread;
+
+#ifdef ENABLE_SYSTEMD_DAEMON
+	Systemd::Watchdog systemd_watchdog;
+#endif
+
+	std::unique_ptr<InputCacheManager> input_cache;
+
+	/**
+	 * Monitor for global idle events to be broadcasted to all
+	 * partitions.
+	 */
 	MaskMonitor idle_monitor;
 
 #ifdef ENABLE_NEIGHBOR_PLUGINS
-	NeighborGlue *neighbors;
+	std::unique_ptr<NeighborGlue> neighbors;
 #endif
 
 #ifdef ENABLE_DATABASE
-	Database *database;
+	DatabasePtr database;
 
 	/**
 	 * This is really a #CompositeStorage.  To avoid heavy include
@@ -82,34 +123,66 @@ struct Instance final
 	UpdateService *update = nullptr;
 #endif
 
-	ClientList *client_list;
+#ifdef ENABLE_CURL
+	std::unique_ptr<RemoteTagCache> remote_tag_cache;
+#endif
 
-	Partition *partition;
+	std::unique_ptr<ClientList> client_list;
 
-	StateFile *state_file;
+	std::list<Partition> partitions;
 
-	Instance()
-		:idle_monitor(event_loop, BIND_THIS_METHOD(OnIdle)), state_file(nullptr) {}
+	std::unique_ptr<StateFile> state_file;
+
+#ifdef ENABLE_SQLITE
+	std::unique_ptr<StickerDatabase> sticker_database;
+#endif
+
+	Instance();
+	~Instance() noexcept;
 
 	/**
-	 * Initiate shutdown.  Wrapper for EventLoop::Break().
+	 * Wrapper for EventLoop::Break().  Call to initiate shutdown.
 	 */
-	void Shutdown() {
+	void Break() noexcept {
 		event_loop.Break();
 	}
 
-	void EmitIdle(unsigned mask) {
+	/**
+	 * Emit an "idle" event to all clients of all partitions.
+	 *
+	 * This method can be called from any thread.
+	 */
+	void EmitIdle(unsigned mask) noexcept {
 		idle_monitor.OrMask(mask);
 	}
 
+	/**
+	 * Notify the #Instance that the state has been modified, and
+	 * the #StateFile may need to be saved.
+	 *
+	 * This method must be called from the main thread.
+	 */
+	void OnStateModified() noexcept;
+
+	/**
+	 * Find a #Partition with the given name.  Returns nullptr if
+	 * no such partition was found.
+	 */
+	gcc_pure
+	Partition *FindPartition(const char *name) noexcept;
+
+	void DeletePartition(Partition &partition) noexcept;
+
+	void BeginShutdownPartitions() noexcept;
+
 #ifdef ENABLE_DATABASE
 	/**
 	 * Returns the global #Database instance.  May return nullptr
 	 * if this MPD configuration has no database (no
 	 * music_directory was configured).
 	 */
-	Database *GetDatabase() {
-		return database;
+	Database *GetDatabase() noexcept {
+		return database.get();
 	}
 
 	/**
@@ -120,20 +193,44 @@ struct Instance final
 	const Database &GetDatabaseOrThrow() const;
 #endif
 
+#ifdef ENABLE_SQLITE
+	bool HasStickerDatabase() noexcept {
+		return sticker_database != nullptr;
+	}
+#endif
+
+	void BeginShutdownUpdate() noexcept;
+
+#ifdef ENABLE_CURL
+	void LookupRemoteTag(const char *uri) noexcept;
+#else
+	void LookupRemoteTag(const char *) noexcept {
+		/* no-op */
+	}
+#endif
+
+	void FlushCaches() noexcept;
+
 private:
 #ifdef ENABLE_DATABASE
-	void OnDatabaseModified() override;
-	void OnDatabaseSongRemoved(const char *uri) override;
+	/* virtual methods from class DatabaseListener */
+	void OnDatabaseModified() noexcept override;
+	void OnDatabaseSongRemoved(const char *uri) noexcept override;
 #endif
 
 #ifdef ENABLE_NEIGHBOR_PLUGINS
 	/* virtual methods from class NeighborListener */
-	void FoundNeighbor(const NeighborInfo &info) override;
-	void LostNeighbor(const NeighborInfo &info) override;
+	void FoundNeighbor(const NeighborInfo &info) noexcept override;
+	void LostNeighbor(const NeighborInfo &info) noexcept override;
+#endif
+
+#ifdef ENABLE_CURL
+	/* virtual methods from class RemoteTagCacheHandler */
+	void OnRemoteTag(const char *uri, const Tag &tag) noexcept override;
 #endif
 
 	/* callback for #idle_monitor */
-	void OnIdle(unsigned mask);
+	void OnIdle(unsigned mask) noexcept;
 };
 
 #endif

src/Listen.cxx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -19,68 +19,34 @@
 
 #include "config.h"
 #include "Listen.hxx"
-#include "client/Client.hxx"
+#include "Log.hxx"
+#include "client/Listener.hxx"
 #include "config/Param.hxx"
-#include "config/ConfigGlobal.hxx"
-#include "config/ConfigOption.hxx"
-#include "net/SocketAddress.hxx"
-#include "event/ServerSocket.hxx"
+#include "config/Data.hxx"
+#include "config/Option.hxx"
+#include "config/Net.hxx"
+#include "net/AllocatedSocketAddress.hxx"
+#include "net/UniqueSocketDescriptor.hxx"
+#include "net/SocketUtil.hxx"
 #include "system/Error.hxx"
 #include "util/RuntimeError.hxx"
-#include "util/Domain.hxx"
 #include "fs/AllocatedPath.hxx"
-#include "Log.hxx"
+#include "fs/XDG.hxx"
 
-#include <string.h>
-#include <assert.h>
+#include <sys/stat.h>
 
 #ifdef ENABLE_SYSTEMD_DAEMON
 #include <systemd/sd-daemon.h>
 #endif
 
-static constexpr Domain listen_domain("listen");
-
 #define DEFAULT_PORT	6600
 
-class ClientListener final : public ServerSocket {
-	Partition &partition;
-
-public:
-	ClientListener(EventLoop &_loop, Partition &_partition)
-		:ServerSocket(_loop), partition(_partition) {}
-
-private:
-	void OnAccept(int fd, SocketAddress address, int uid) override {
-		client_new(GetEventLoop(), partition,
-			   fd, address, uid);
-	}
-};
-
-static ClientListener *listen_socket;
 int listen_port;
 
-/**
- * Throws #std::runtime_error on error.
- */
-static void
-listen_add_config_param(unsigned int port,
-			const ConfigParam *param)
-{
-	assert(param != nullptr);
-
-	if (0 == strcmp(param->value.c_str(), "any")) {
-		listen_socket->AddPort(port);
-	} else if (param->value[0] == '/' || param->value[0] == '~') {
-		listen_socket->AddPath(param->GetPath());
-	} else {
-		listen_socket->AddHost(param->value.c_str(), port);
-	}
-}
-
 #ifdef ENABLE_SYSTEMD_DAEMON
 
 static bool
-listen_systemd_activation()
+listen_systemd_activation(ClientListener &listener)
 {
 	int n = sd_listen_fds(true);
 	if (n <= 0) {
@@ -91,67 +57,103 @@ listen_systemd_activation()
 
 	for (int i = SD_LISTEN_FDS_START, end = SD_LISTEN_FDS_START + n;
 	     i != end; ++i)
-		listen_socket->AddFD(i);
+		listener.AddFD(UniqueSocketDescriptor(i));
 
 	return true;
 }
 
 #endif
 
-void
-listen_global_init(EventLoop &loop, Partition &partition)
+/**
+ * Listen on "$XDG_RUNTIME_DIR/mpd/socket" (if applicable).
+ *
+ * @return true if a listener socket was added
+ */
+static bool
+ListenXdgRuntimeDir(ClientListener &listener) noexcept
 {
-	int port = config_get_positive(ConfigOption::PORT, DEFAULT_PORT);
-	const auto *param = config_get_param(ConfigOption::BIND_TO_ADDRESS);
+#if defined(USE_XDG) && defined(HAVE_UN)
+	if (geteuid() == 0)
+		/* this MPD instance is a system-wide daemon; don't
+		   use $XDG_RUNTIME_DIR */
+		return false;
 
-	listen_socket = new ClientListener(loop, partition);
+	Path xdg_runtime_dir = Path::FromFS(getenv("XDG_RUNTIME_DIR"));
+	if (xdg_runtime_dir.IsNull())
+		return false;
+
+	const auto mpd_runtime_dir = xdg_runtime_dir / Path::FromFS("mpd");
+	mkdir(mpd_runtime_dir.c_str(), 0700);
+
+	const auto socket_path = mpd_runtime_dir / Path::FromFS("socket");
+	unlink(socket_path.c_str());
+
+	AllocatedSocketAddress address;
+	address.SetLocal(socket_path.c_str());
+
+	try {
+		auto fd = socket_bind_listen(AF_LOCAL, SOCK_STREAM, 0,
+					     address, 5);
+		chmod(socket_path.c_str(), 0600);
+		listener.AddFD(std::move(fd), std::move(address));
+		return true;
+	} catch (...) {
+		FormatError(std::current_exception(),
+			    "Failed to listen on '%s' (not fatal)",
+			    socket_path.c_str());
+		return false;
+	}
+#else
+	(void)listener;
+	return false;
+#endif
+}
+
+void
+listen_global_init(const ConfigData &config, ClientListener &listener)
+{
+	int port = config.GetPositive(ConfigOption::PORT, DEFAULT_PORT);
 
 #ifdef ENABLE_SYSTEMD_DAEMON
-	if (listen_systemd_activation())
+	if (listen_systemd_activation(listener))
 		return;
 #endif
 
-	if (param != nullptr) {
-		/* "bind_to_address" is configured, create listeners
-		   for all values */
+	for (const auto &param : config.GetParamList(ConfigOption::BIND_TO_ADDRESS)) {
+		try {
+			ServerSocketAddGeneric(listener, param.value.c_str(),
+					       port);
+		} catch (...) {
+			std::throw_with_nested(FormatRuntimeError("Failed to listen on %s (line %i)",
+								  param.value.c_str(),
+								  param.line));
+		}
+	}
 
-		do {
-			try {
-				listen_add_config_param(port, param);
-			} catch (const std::runtime_error &e) {
-				delete listen_socket;
-				std::throw_with_nested(FormatRuntimeError("Failed to listen on %s (line %i)",
-									  param->value.c_str(),
-									  param->line));
-			}
-		} while ((param = param->next) != nullptr);
-	} else {
+	bool have_xdg_runtime_listener = false;
+
+	if (listener.IsEmpty()) {
 		/* no "bind_to_address" configured, bind the
 		   configured port on all interfaces */
 
+		have_xdg_runtime_listener = ListenXdgRuntimeDir(listener);
+
 		try {
-			listen_socket->AddPort(port);
-		} catch (const std::runtime_error &e) {
-			delete listen_socket;
+			listener.AddPort(port);
+		} catch (...) {
 			std::throw_with_nested(FormatRuntimeError("Failed to listen on *:%d: ", port));
 		}
 	}
 
 	try {
-		listen_socket->Open();
-	} catch (const std::runtime_error &e) {
-		delete listen_socket;
-		throw;
+		listener.Open();
+	} catch (...) {
+		if (have_xdg_runtime_listener)
+			LogError(std::current_exception(),
+				 "Default TCP listener setup failed, but this is okay because we have a $XDG_RUNTIME_DIR listener");
+		else
+			throw;
 	}
 
 	listen_port = port;
 }
-
-void listen_global_finish(void)
-{
-	LogDebug(listen_domain, "listen_global_finish called");
-
-	assert(listen_socket != nullptr);
-
-	delete listen_socket;
-}

src/Listen.hxx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -20,15 +20,12 @@
 #ifndef MPD_LISTEN_HXX
 #define MPD_LISTEN_HXX
 
-class EventLoop;
-struct Partition;
+struct ConfigData;
+class ClientListener;
 
 extern int listen_port;
 
 void
-listen_global_init(EventLoop &loop, Partition &partition);
-
-void
-listen_global_finish();
+listen_global_init(const ConfigData &config, ClientListener &listener);
 
 #endif

src/LocateUri.cxx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -22,13 +22,15 @@
 #include "client/Client.hxx"
 #include "fs/AllocatedPath.hxx"
 #include "ls.hxx"
-#include "util/UriUtil.hxx"
-#include "util/StringCompare.hxx"
+#include "util/ASCII.hxx"
+#include "util/UriExtract.hxx"
 
 #ifdef ENABLE_DATABASE
 #include "storage/StorageInterface.hxx"
 #endif
 
+#include <stdexcept>
+
 static LocatedUri
 LocateFileUri(const char *uri, const Client *client
 #ifdef ENABLE_DATABASE
@@ -40,11 +42,13 @@ LocateFileUri(const char *uri, const Client *client
 
 #ifdef ENABLE_DATABASE
 	if (storage != nullptr) {
-		const char *suffix = storage->MapToRelativeUTF8(uri);
-		if (suffix != nullptr)
+		const auto suffix = storage->MapToRelativeUTF8(uri);
+		if (suffix.data() != nullptr)
 			/* this path was relative to the music
 			   directory */
-			return LocatedUri(LocatedUri::Type::RELATIVE, suffix);
+			// TODO: don't use suffix.data() (ok for now because we know it's null-terminated)
+			return LocatedUri(LocatedUri::Type::RELATIVE,
+					  suffix.data());
 	}
 #endif
 
@@ -55,20 +59,34 @@ LocateFileUri(const char *uri, const Client *client
 }
 
 static LocatedUri
-LocateAbsoluteUri(const char *uri
+LocateAbsoluteUri(UriPluginKind kind, const char *uri
 #ifdef ENABLE_DATABASE
 		  , const Storage *storage
 #endif
 		  )
 {
-	if (!uri_supported_scheme(uri))
-		throw std::runtime_error("Unsupported URI scheme");
+	switch (kind) {
+	case UriPluginKind::INPUT:
+	case UriPluginKind::STORAGE: // TODO: separate check for storage plugins
+		if (!uri_supported_scheme(uri))
+			throw std::runtime_error("Unsupported URI scheme");
+		break;
+
+	case UriPluginKind::PLAYLIST:
+		/* for now, no validation for playlist URIs; this is
+		   more complicated because there are three ways to
+		   identify which plugin to use: URI scheme, filename
+		   suffix and MIME type */
+		break;
+	}
 
 #ifdef ENABLE_DATABASE
 	if (storage != nullptr) {
-		const char *suffix = storage->MapToRelativeUTF8(uri);
-		if (suffix != nullptr)
-			return LocatedUri(LocatedUri::Type::RELATIVE, suffix);
+		const auto suffix = storage->MapToRelativeUTF8(uri);
+		if (suffix.data() != nullptr)
+			// TODO: don't use suffix.data() (ok for now because we know it's null-terminated)
+			return LocatedUri(LocatedUri::Type::RELATIVE,
+					  suffix.data());
 	}
 #endif
 
@@ -76,14 +94,15 @@ LocateAbsoluteUri(const char *uri
 }
 
 LocatedUri
-LocateUri(const char *uri, const Client *client
+LocateUri(UriPluginKind kind,
+	  const char *uri, const Client *client
 #ifdef ENABLE_DATABASE
 	  , const Storage *storage
 #endif
 	  )
 {
 	/* skip the obsolete "file://" prefix */
-	const char *path_utf8 = StringAfterPrefix(uri, "file://");
+	const char *path_utf8 = StringAfterPrefixCaseASCII(uri, "file://");
 	if (path_utf8 != nullptr) {
 		if (!PathTraitsUTF8::IsAbsolute(path_utf8))
 			throw std::runtime_error("Malformed file:// URI");
@@ -100,7 +119,7 @@ LocateUri(const char *uri, const Client *client
 #endif
 				     );
 	else if (uri_has_scheme(uri))
-		return LocateAbsoluteUri(uri
+		return LocateAbsoluteUri(kind, uri
 #ifdef ENABLE_DATABASE
 					 , storage
 #endif

src/LocateUri.hxx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -20,8 +20,7 @@
 #ifndef MPD_LOCATE_URI_HXX
 #define MPD_LOCATE_URI_HXX
 
-#include "check.h"
-#include "Compiler.h"
+#include "config.h"
 #include "fs/AllocatedPath.hxx"
 
 #ifdef _WIN32
@@ -41,6 +40,12 @@ class Client;
 class Storage;
 #endif
 
+enum class UriPluginKind {
+	INPUT,
+	STORAGE,
+	PLAYLIST,
+};
+
 struct LocatedUri {
 	enum class Type {
 		/**
@@ -67,7 +72,7 @@ struct LocatedUri {
 	AllocatedPath path;
 
 	LocatedUri(Type _type, const char *_uri,
-		   AllocatedPath &&_path=AllocatedPath::Null())
+		   AllocatedPath &&_path=nullptr)
 		:type(_type), canonical_uri(_uri), path(std::move(_path)) {}
 };
 
@@ -84,7 +89,8 @@ struct LocatedUri {
  * that feature is disabled if this parameter is nullptr
  */
 LocatedUri
-LocateUri(const char *uri, const Client *client
+LocateUri(UriPluginKind kind,
+	  const char *uri, const Client *client
 #ifdef ENABLE_DATABASE
 	  , const Storage *storage
 #endif

src/Log.cxx

@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2017 The Music Player Daemon Project
+ * Copyright 2003-2021 The Music Player Daemon Project
  * http://www.musicpd.org
  *
  * This program is free software; you can redistribute it and/or modify
@@ -17,174 +17,143 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include "config.h"
 #include "LogV.hxx"
 #include "util/Domain.hxx"
+#include "util/Exception.hxx"
 
-#include <exception>
+#include <cerrno>
 
 #include <stdio.h>
 #include <string.h>
-#include <errno.h>
 
 static constexpr Domain exception_domain("exception");
 
 void
-LogFormatV(const Domain &domain, LogLevel level, const char *fmt, va_list ap)
+LogFormatV(LogLevel level, const Domain &domain,
+	   const char *fmt, std::va_list ap) noexcept
 {
 	char msg[1024];
 	vsnprintf(msg, sizeof(msg), fmt, ap);
-	Log(domain, level, msg);
+	Log(level, domain, msg);
 }
 
 void
-LogFormat(const Domain &domain, LogLevel level, const char *fmt, ...)
+LogFormat(LogLevel level, const Domain &domain, const char *fmt, ...) noexcept
 {
-	va_list ap;
+	std::va_list ap;
 	va_start(ap, fmt);
-	LogFormatV(domain, level, fmt, ap);
+	LogFormatV(level, domain, fmt, ap);
 	va_end(ap);
 }
 
 void
-FormatDebug(const Domain &domain, const char *fmt, ...)
+FormatDebug(const Domain &domain, const char *fmt, ...) noexcept
 {
-	va_list ap;
+	std::va_list ap;
 	va_start(ap, fmt);
-	LogFormatV(domain, LogLevel::DEBUG, fmt, ap);
+	LogFormatV(LogLevel::DEBUG, domain, fmt, ap);
 	va_end(ap);
 }
 
 void
-FormatInfo(const Domain &domain, const char *fmt, ...)
+FormatInfo(const Domain &domain, const char *fmt, ...) noexcept
 {
-	va_list ap;
+	std::va_list ap;
 	va_start(ap, fmt);
-	LogFormatV(domain, LogLevel::INFO, fmt, ap);
+	LogFormatV(LogLevel::INFO, domain, fmt, ap);
 	va_end(ap);
 }
 
 void
-FormatDefault(const Domain &domain, const char *fmt, ...)
+FormatNotice(const Domain &domain, const char *fmt, ...) noexcept
 {
-	va_list ap;
+	std::va_list ap;
 	va_start(ap, fmt);
-	LogFormatV(domain, LogLevel::DEFAULT, fmt, ap);
+	LogFormatV(LogLevel::NOTICE, domain, fmt, ap);
 	va_end(ap);
 }
 
 void
-FormatWarning(const Domain &domain, const char *fmt, ...)
+FormatWarning(const Domain &domain, const char *fmt, ...) noexcept
 {
-	va_list ap;
+	std::va_list ap;
 	va_start(ap, fmt);
-	LogFormatV(domain, LogLevel::WARNING, fmt, ap);
+	LogFormatV(LogLevel::WARNING, domain, fmt, ap);
 	va_end(ap);
 }
 
 void
-FormatError(const Domain &domain, const char *fmt, ...)
+FormatError(const Domain &domain, const char *fmt, ...) noexcept
 {
-	va_list ap;
+	std::va_list ap;
 	va_start(ap, fmt);
-	LogFormatV(domain, LogLevel::ERROR, fmt, ap);
+	LogFormatV(LogLevel::ERROR, domain, fmt, ap);
 	va_end(ap);
 }
 
 void
-LogError(const std::exception &e)
+Log(LogLevel level, const std::exception &e) noexcept
 {
-	Log(exception_domain, LogLevel::ERROR, e.what());
-
-	try {
-		std::rethrow_if_nested(e);
-	} catch (const std::exception &nested) {
-		LogError(nested, "nested");
-	} catch (...) {
-		Log(exception_domain, LogLevel::ERROR,
-		    "Unrecognized nested exception");
-	}
+	Log(level, exception_domain, GetFullMessage(e).c_str());
 }
 
 void
-LogError(const std::exception &e, const char *msg)
+Log(LogLevel level, const std::exception &e, const char *msg) noexcept
 {
-	FormatError(exception_domain, "%s: %s", msg, e.what());
-
-	try {
-		std::rethrow_if_nested(e);
-	} catch (const std::exception &nested) {
-		LogError(nested);
-	} catch (...) {
-		Log(exception_domain, LogLevel::ERROR,
-		    "Unrecognized nested exception");
-	}
+	LogFormat(level, exception_domain, "%s: %s", msg, GetFullMessage(e).c_str());
 }
 
 void
-FormatError(const std::exception &e, const char *fmt, ...)
+LogFormat(LogLevel level, const std::exception &e, const char *fmt, ...) noexcept
 {
 	char msg[1024];
-	va_list ap;
+	std::va_list ap;
 	va_start(ap, fmt);
 	vsnprintf(msg, sizeof(msg), fmt, ap);
 	va_end(ap);
 
-	LogError(e, msg);
+	Log(level, e, msg);
 }
 
 void
-LogError(const std::exception_ptr &ep)
+Log(LogLevel level, const std::exception_ptr &ep) noexcept
 {
-	try {
-		std::rethrow_exception(ep);
-	} catch (const std::exception &e) {
-		LogError(e);
-	} catch (...) {
-		Log(exception_domain, LogLevel::ERROR,
-		    "Unrecognized exception");
-	}
+	Log(level, exception_domain, GetFullMessage(ep).c_str());
 }
 
 void
-LogError(const std::exception_ptr &ep, const char *msg)
+Log(LogLevel level, const std::exception_ptr &ep, const char *msg) noexcept
 {
-	try {
-		std::rethrow_exception(ep);
-	} catch (const std::exception &e) {
-		LogError(e, msg);
-	} catch (...) {
-		FormatError(exception_domain,
-			    "%s: Unrecognized exception", msg);
-	}
+	LogFormat(level, exception_domain, "%s: %s", msg,
+		  GetFullMessage(ep).c_str());
 }
 
 void
-FormatError(const std::exception_ptr &ep, const char *fmt, ...)
+LogFormat(LogLevel level, const std::exception_ptr &ep, const char *fmt, ...) noexcept
 {
 	char msg[1024];
-	va_list ap;
+	std::va_list ap;
 	va_start(ap, fmt);
 	vsnprintf(msg, sizeof(msg), fmt, ap);
 	va_end(ap);
 
-	LogError(ep, msg);
+	Log(level, ep, msg);
 }
 
 void
-LogErrno(const Domain &domain, int e, const char *msg)
+LogErrno(const Domain &domain, int e, const char *msg) noexcept
 {
-	LogFormat(domain, LogLevel::ERROR, "%s: %s", msg, strerror(e));
+	LogFormat(LogLevel::ERROR, domain, "%s: %s", msg, strerror(e));
 }
 
 void
-LogErrno(const Domain &domain, const char *msg)
+LogErrno(const Domain &domain, const char *msg) noexcept
 {
 	LogErrno(domain, errno, msg);
 }
 
 static void
-FormatErrnoV(const Domain &domain, int e, const char *fmt, va_list ap)
+FormatErrnoV(const Domain &domain, int e, const char *fmt, std::va_list ap) noexcept
 {
 	char msg[1024];
 	vsnprintf(msg, sizeof(msg), fmt, ap);
@@ -193,20 +162,20 @@ FormatErrnoV(const Domain &domain, int e, const char *fmt, va_list ap)
 }
 
 void
-FormatErrno(const Domain &domain, int e, const char *fmt, ...)
+FormatErrno(const Domain &domain, int e, const char *fmt, ...) noexcept
 {
-	va_list ap;
+	std::va_list ap;
 	va_start(ap, fmt);
 	FormatErrnoV(domain, e, fmt, ap);
 	va_end(ap);
 }
 
 void
-FormatErrno(const Domain &domain, const char *fmt, ...)
+FormatErrno(const Domain &domain, const char *fmt, ...) noexcept
 {
 	const int e = errno;
 
-	va_list ap;
+	std::va_list ap;
 	va_start(ap, fmt);
 	FormatErrnoV(domain, e, fmt, ap);
 	va_end(ap);