release v0.21.9

Closes https://github.com/MusicPlayerDaemon/MPD/issues/340

.travis.yml

@@ -9,7 +9,7 @@ matrix:
           sources:
             - ubuntu-toolchain-r-test
             - sourceline: 'ppa:mhier/libboost-latest'
-            - sourceline: 'ppa:saiarcot895/chromium-dev' # for ninja-build
+            - sourceline: 'ppa:mstipicevic/ninja-build-1-7-2'
             - sourceline: 'ppa:deadsnakes/ppa' # for Python 3.7 (required by Meson)
           packages:
             - g++-6
@@ -34,7 +34,7 @@ matrix:
           sources:
             - ubuntu-toolchain-r-test
             - sourceline: 'ppa:mhier/libboost-latest'
-            - sourceline: 'ppa:saiarcot895/chromium-dev' # for ninja-build
+            - sourceline: 'ppa:mstipicevic/ninja-build-1-7-2'
             - sourceline: 'ppa:deadsnakes/ppa' # for Python 3.7 (required by Meson)
           packages:
             - g++-8

NEWS

@@ -1,3 +1,57 @@
+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

android/AndroidManifest.xml

@@ -2,8 +2,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           package="org.musicpd"
           android:installLocation="auto"
-          android:versionCode="27"
-          android:versionName="0.21.5">
+          android:versionCode="32"
+          android:versionName="0.21.9">
 
   <uses-sdk android:minSdkVersion="21" android:targetSdkVersion="26"/>
 

android/build.py

@@ -138,6 +138,12 @@ class AndroidNdkToolchain:
         libstdcxx_ldflags = libstdcxx_flags + ' -L' + libcxx_libs_path
         libstdcxx_libs = '-lc++_static -lc++abi'
 
+        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

android/meson.build

@@ -6,7 +6,7 @@ android_sdk = get_option('android_sdk')
 android_abi = get_option('android_abi')
 
 android_sdk_build_tools_version = '27.0.0'
-android_sdk_platform = 'android-21'
+android_sdk_platform = 'android-23'
 
 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/src/Settings.java

@@ -21,10 +21,12 @@ 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;
@@ -178,6 +180,14 @@ public class Settings extends Activity {
 
 	@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);
@@ -203,6 +213,31 @@ public class Settings extends Activity {
 		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() {
 

doc/conf.py

@@ -38,7 +38,7 @@ author = 'Max Kellermann'
 # built documents.
 #
 # The short X.Y version.
-version = '0.21.5'
+version = '0.21.9'
 # The full version, including alpha/beta/rc tags.
 release = version
 

doc/developer.rst

@@ -96,10 +96,8 @@ When the whole patch series is finished, convert stgit patches to git commits:
 Submitting Patches
 ==================
 
-Send your patches to the mailing list:
-Email: `mpd-devel <mpd-devel@musicpd.org>`_
-
-:program:`git pull` requests are preferred.
+Submit pull requests on GitHub:
+https://github.com/MusicPlayerDaemon/MPD/pulls
 
 Development Tools
 =================

doc/mpd.conf.5

@@ -140,7 +140,6 @@ of database.
 .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>
@@ -164,57 +163,12 @@ 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

doc/plugins.rst

@@ -690,6 +690,8 @@ Valid quality values for libsoxr:
 * "low"
 * "quick"
 
+.. _output_plugins:
+
 Output plugins
 --------------
 
@@ -800,6 +802,15 @@ The fifo plugin writes raw PCM data to a FIFO (First In, First Out) file. The da
    * - **path P**
      - This specifies the path of the FIFO to write to. Must be an absolute path. If the path does not exist, it will be created when MPD is started, and removed when MPD is stopped. The FIFO will be created with the same user and group as MPD is running as. Default permissions can be modified by using the builtin shell command umask. If a FIFO already exists at the specified path it will be reused, and will not be removed when MPD is stopped. You can use the "mkfifo" command to create this, and then you may modify the permissions to your liking.
 
+haiku
+~~~~~
+
+Use the SoundPlayer API on the Haiku operating system.
+
+This plugin is unmaintained and contains known bugs.  It will be
+removed soon, unless there is a new maintainer.
+
+
 jack
 ~~~~
 The jack plugin connects to a `JACK server <http://jackaudio.org/>`_.
@@ -838,7 +849,7 @@ It is highly recommended to configure a fixed format, because a stream cannot sw
    * - **port P**
      - Binds the HTTP server to the specified port.
    * - **bind_to_address ADDR**
-     - Binds the HTTP server to the specified address (IPv4, IPv6 or UNIX socket). Multiple addresses in parallel are not supported.
+     - Binds the HTTP server to the specified address (IPv4, IPv6 or local socket). Multiple addresses in parallel are not supported.
    * - **encoder NAME**
      - Chooses an encoder plugin. A list of encoder plugins can be found in the encoder plugin reference :ref:`encoder_plugins`.
    * - **max_clients MC**
@@ -1037,8 +1048,41 @@ The "Solaris" plugin runs only on SUN Solaris, and plays via /dev/audio.
    * - **device PATH**
      - Sets the path of the audio device, defaults to /dev/audio.
 
+
+.. _filter_plugins:
+
+Filter plugins
+--------------
+
+normalize
+~~~~~~~~~
+
+Normalize the volume during playback (at the expensve of quality).
+
+
+null
+~~~~
+
+A no-op filter.  Audio data is returned as-is.
+
+
+route
+~~~~~
+
+Reroute channels.
+
+.. list-table::
+   :widths: 20 80
+   :header-rows: 1
+
+   * - Setting
+     - Description
+   * - **routes "0>0, 1>1, ..."**
+     - Specifies the channel mapping.
+
+
 .. _playlist_plugins:
-     
+
 Playlist plugins
 ----------------
 

doc/protocol.rst

@@ -14,6 +14,9 @@ Once the client is connected to the server, they conduct a
 conversation until the client closes the connection. The
 conversation flow is always initiated by the client.
 
+All data between the client and the server is encoded in
+UTF-8.
+
 The client transmits a command sequence, terminated by the
 newline character ``\n``.  The server will
 respond with one or more lines, the last of which will be a
@@ -42,9 +45,6 @@ quotation marks.
 Argument strings are separated from the command and any other
 arguments by linear white-space (' ' or '\\t').
 
-All data between the client and the server is encoded in
-UTF-8.
-
 Responses
 =========
 
@@ -52,6 +52,28 @@ A command returns ``OK`` on completion or
 ``ACK some error`` on failure.  These
 denote the end of command execution.
 
+Some commands return more data before the response ends with ``OK``.
+Each line is usually in the form ``NAME: VALUE``.  Example::
+
+  foo: bar
+  OK
+
+.. _binary:
+
+Binary Responses
+----------------
+
+Some commands can return binary data.  This is initiated by a line
+containing ``binary: 1234`` (followed as usual by a newline).  After
+that, the specified number of bytes of binary data follows (without an
+extra newline, because this binary data is not a text line), and
+finally the ``OK`` line.  Example::
+
+  foo: bar
+  binary: 42
+  <42 bytes>OK
+
+
 Failure responses
 -----------------
 
@@ -112,9 +134,9 @@ list begins with `command_list_begin` or
 `command_list_ok_begin` and ends with
 `command_list_end`.
 
-It does not execute any commands until the list has ended.
-The return value is whatever the return for a list of commands
-is.  On success for all commands,
+It does not execute any commands until the list has ended.  The
+response is a concatentation of all individual responses.
+On success for all commands,
 ``OK`` is returned.  If a command
 fails, no more commands are executed and the appropriate
 ``ACK`` error is returned. If
@@ -144,15 +166,20 @@ syntax::
 ``EXPRESSION`` is a string enclosed in parantheses which can be one
 of:
 
-- ``(TAG == 'VALUE')``: match a tag value.
-  ``(TAG != 'VALUE')``: mismatch a tag value.
-  The special tag "*any*" checks all
-  tag values.
-  *albumartist* looks for
+- ``(TAG == 'VALUE')``: match a tag value; if there are multiple
+  values of the given type, at least one must match.
+  ``(TAG != 'VALUE')``: mismatch a tag value; if there are multiple
+  values of the given type, none of them must match.
+  The special tag ``any`` checks all
+  tag types.
+  ``AlbumArtist`` looks for
   ``VALUE`` in ``AlbumArtist``
   and falls back to ``Artist`` tags if
   ``AlbumArtist`` does not exist.
   ``VALUE`` is what to find.
+  An empty value string means: match only if the given tag type does
+  not exist at all; this implies that negation with an empty value
+  checks for the existence of the given tag type.
 
 - ``(TAG contains 'VALUE')`` checks if the given value is a substring
   of the tag value.
@@ -173,12 +200,13 @@ of:
   file's time stamp with the given value (ISO 8601 or UNIX
   time stamp).
 
-- ``(AudioFormat == 'SAMPLERATE:BITS:CHANNELS')``:
-  compares the audio format with the given value.
+- ``(AudioFormat == 'SAMPLERATE:BITS:CHANNELS')``: compares the audio
+  format with the given value.  See :ref:`audio_output_format` for a
+  detailed explanation.
 
 - ``(AudioFormat =~ 'SAMPLERATE:BITS:CHANNELS')``:
   matches the audio format with the given mask (i.e. one
-  or more attributes may be "*").
+  or more attributes may be ``*``).
 
 - ``(!EXPRESSION)``: negate an expression.  Note that each expression
   must be enclosed in parantheses, e.g. :code:`(!(artist == 'VALUE'))`
@@ -207,11 +235,11 @@ backslash.
 
 Example expression which matches an artist named ``foo'bar"``::
 
- (artist "foo\'bar\"")
+ (Artist == "foo\'bar\"")
 
 At the protocol level, the command must look like this::
 
- find "(artist \"foo\\'bar\\\"\")"
+ find "(Artist == \"foo\\'bar\\\"\")"
 
 The double quotes enclosing the artist name must be escaped because
 they are inside a double-quoted ``find`` parameter.  The single quote
@@ -409,15 +437,18 @@ Querying :program:`MPD`'s status
     - ``songid``: playlist songid of the current song stopped on or playing
     - ``nextsong`` [#since_0_15]_: playlist song number of the next song to be played
     - ``nextsongid`` [#since_0_15]_: playlist songid of the next song to be played
-    - ``time``: total time elapsed (of current playing/paused song)
+    - ``time``: total time elapsed (of current playing/paused song) in seconds
       (deprecated, use ``elapsed`` instead)
-    - ``elapsed`` [#since_0_16]_: Total time elapsed within the current song, but with higher resolution.
+    - ``elapsed`` [#since_0_16]_: Total time elapsed within the
+      current song in seconds, but with higher resolution.
     - ``duration`` [#since_0_20]_: Duration of the current song in seconds.
     - ``bitrate``: instantaneous bitrate in kbps
     - ``xfade``: ``crossfade`` in seconds
     - ``mixrampdb``: ``mixramp`` threshold in dB
     - ``mixrampdelay``: ``mixrampdelay`` in seconds
-    - ``audio``: The format emitted by the decoder plugin during playback, format: ``*samplerate:bits:channels*``. Check the user manual for a detailed explanation.
+    - ``audio``: The format emitted by the decoder plugin during
+      playback, format: ``samplerate:bits:channels``.  See
+      :ref:`audio_output_format` for a detailed explanation.
     - ``updating_db``: ``job id``
     - ``error``: if there is an error, returns message here
 
@@ -432,7 +463,7 @@ Querying :program:`MPD`'s status
     - ``albums``: number of albums
     - ``songs``: number of songs
     - ``uptime``: daemon uptime in seconds
-    - ``db_playtime``: sum of all song times in the db
+    - ``db_playtime``: sum of all song times in the database in seconds
     - ``db_update``: last db update in UNIX time
     - ``playtime``: time length of music played
 
@@ -594,7 +625,7 @@ Whenever possible, ids should be used.
     Deletes the song ``SONGID`` from the
     playlist
 
-:command:`move {FROM} [{START:END} | {TO}]`
+:command:`move [{FROM} | {START:END}] {TO}`
     Moves the song at ``FROM`` or range of songs
     at ``START:END`` [#since_0_15]_ to ``TO``
     in the playlist.
@@ -714,7 +745,9 @@ and without the `.m3u` suffix).
 Some of the commands described in this section can be used to
 run playlist plugins instead of the hard-coded simple
 `m3u` parser.  They can access playlists in
-the music directory (relative path including the suffix) or
+the music directory (relative path including the suffix),
+playlists in arbitrary location (absolute path including the suffix;
+allowed only for clients that are connected via local socket), or
 remote playlists (absolute URI with a supported scheme).
 
 :command:`listplaylist {NAME}`
@@ -783,7 +816,7 @@ The music database
 
     Returns the file size and actual number
     of bytes read at the requested offset, followed
-    by the chunk requested as raw bytes, then a
+    by the chunk requested as raw bytes (see :ref:`binary`), then a
     newline and the completion code.
 
     Example::
@@ -791,8 +824,7 @@ The music database
      albumart
      size: 1024768
      binary: 8192
-     <8192 bytes>
-     OK
+     <8192 bytes>OK
 
 :command:`count {FILTER} [group {GROUPTYPE}]`
     Count the number of songs and their total playtime in
@@ -853,8 +885,7 @@ The music database
 :command:`list {TYPE} {FILTER} [group {GROUPTYPE}]`
     Lists unique tags values of the specified type.
     ``TYPE`` can be any tag supported by
-    :program:`MPD` or
-    *file*.
+    :program:`MPD`.
 
     Additional arguments may specify a :ref:`filter <filter_syntax>`.
     The *group* keyword may be used
@@ -865,6 +896,10 @@ The music database
 
      list album group albumartist
 
+    ``list file`` was implemented in an early :program:`MPD` version,
+    but does not appear to make a lot of sense.  It still works (to
+    avoid breaking compatibility), but is deprecated.
+
 .. _command_listall:
 
 :command:`listall [URI]`
@@ -924,7 +959,7 @@ The music database
     This command may be used to list metadata of remote
     files (e.g. URI beginning with "http://" or "smb://").
 
-    Clients that are connected via UNIX domain socket may
+    Clients that are connected via local socket may
     use this command to read the tags of an arbitrary local
     file (URI is an absolute path).
 
@@ -1046,7 +1081,8 @@ Stickers
 "Stickers" [#since_0_15]_ are pieces of
 information attached to existing
 :program:`MPD` objects (e.g. song files,
-directories, albums).  Clients can create arbitrary name/value
+directories, albums; but currently, they are only implemented for
+song).  Clients can create arbitrary name/value
 pairs.  :program:`MPD` itself does not assume
 any special meaning in them.
 
@@ -1215,7 +1251,7 @@ Reflection
 :command:`config`
     Dumps configuration values that may be interesting for
     the client.  This command is only permitted to "local"
-    clients (connected via UNIX domain socket).
+    clients (connected via local socket).
 
     The following response attributes are available:
 

doc/user.rst

@@ -54,7 +54,7 @@ Download the source tarball from the `MPD home page <https://musicpd.org>`_ and
 In any case, you need:
 
 * a C++14 compiler (e.g. gcc 6.0 or clang 3.9)
-* `Meson 0.47.2 <http://mesonbuild.com/>`__ and `Ninja
+* `Meson 0.49.0 <http://mesonbuild.com/>`__ and `Ninja
   <https://ninja-build.org/>`__
 * Boost 1.58
 * pkg-config 
@@ -365,10 +365,14 @@ More information can be found in the :ref:`decoder_plugins` reference.
 Configuring encoder plugins
 ---------------------------
 
-Encoders are used by some of the output plugins (such as shout). The encoder settings are included in the audio_output section.
+Encoders are used by some of the output plugins (such as shout). The
+encoder settings are included in the ``audio_output`` section, see :ref:`config_audio_output`.
 
 More information can be found in the :ref:`encoder_plugins` reference.
 
+
+.. _config_audio_output:
+
 Configuring audio outputs
 -------------------------
 
@@ -398,14 +402,9 @@ The following table lists the audio_output options valid for all plugins:
      - The name of the plugin
    * - **name**
      - The name of the audio output. It is visible to the client. Some plugins also use it internally, e.g. as a name registered in the PULSE server.
-   * - **format**
-     -  Always open the audio output with the specified audio format samplerate:bits:channels), regardless of the format of the input file. This is optional for most plugins.
-
-        Any of the three attributes may be an asterisk to specify that this attribute should not be enforced, example: 48000:16:*. *:*:* is equal to not having a format specification.
-
-        The following values are valid for bits: 8 (signed 8 bit integer samples), 16, 24 (signed 24 bit integer samples padded to 32 bit), 32 (signed 32 bit integer samples), f (32 bit floating point, -1.0 to 1.0), "dsd" means DSD (Direct Stream Digital). For DSD, there are special cases such as "dsd64", which allows you to omit the sample rate (e.g. dsd512:2 for stereo DSD512, i.e. 22.5792 MHz).
-
-        The sample rate is special for DSD: :program:`MPD` counts the number of bytes, not bits. Thus, a DSD "bit" rate of 22.5792 MHz (DSD512) is 2822400 from :program:`MPD`'s point of view (44100*512/8).
+   * - **format samplerate:bits:channels**
+     -  Always open the audio output with the specified audio format, regardless of the format of the input file. This is optional for most plugins.
+        See :ref:`audio_output_format` for a detailed description of the value.
    * - **enabed yes|no**
      - Specifies whether this audio output is enabled when :program:`MPD` is started. By default, all audio outputs are enabled. This is just the default setting when there is no state file; with a state file, the previous state is restored.
    * - **tags yes|no**
@@ -421,6 +420,15 @@ The following table lists the audio_output options valid for all plugins:
        implement an external mixer :ref:`external_mixer`) or no mixer
        (:samp:`none`). By default, the hardware mixer is used for
        devices which support it, and none for the others.
+   * - **filters "name,...**"
+     - The specified configured filters are instantiated in the given
+       order.  Each filter name refers to a ``filter`` block, see
+       :ref:`config_filter`.
+
+More information can be found in the :ref:`output_plugins` reference.
+
+
+.. _config_filter:
 
 Configuring filters
 -------------------
@@ -436,6 +444,9 @@ To configure a filter, add a :code:`filter` block to :file:`mpd.conf`:
         name "software volume"
     }
 
+Configured filters may then be added to the ``filters`` setting of an
+``audio_output`` section, see :ref:`config_audio_output`.
+
 The following table lists the filter options valid for all plugins:
 
 .. list-table::
@@ -449,6 +460,9 @@ The following table lists the filter options valid for all plugins:
    * - **name**
      - The name of the filter
 
+More information can be found in the :ref:`filter_plugins` reference.
+
+
 Configuring playlist plugins
 ----------------------------
 
@@ -485,10 +499,31 @@ reference.
 Audio Format Settings
 ---------------------
 
+.. _audio_output_format:
+
 Global Audio Format
 ~~~~~~~~~~~~~~~~~~~
 
-The setting audio_output_format forces :program:`MPD` to use one audio format for all outputs. Doing that is usually not a good idea. The values are the same as in format in the audio_output section.
+The setting ``audio_output_format`` forces :program:`MPD` to use one
+audio format for all outputs.  Doing that is usually not a good idea.
+
+The value is specified as ``samplerate:bits:channels``.
+
+Any of the three attributes may be an asterisk to specify that this
+attribute should not be enforced, example: ``48000:16:*``.
+``*:*:*`` is equal to not having a format specification.
+
+The following values are valid for bits: ``8`` (signed 8 bit integer
+samples), ``16``, ``24`` (signed 24 bit integer samples padded to 32
+bit), ``32`` (signed 32 bit integer samples), ``f`` (32 bit floating
+point, -1.0 to 1.0), ``dsd`` means DSD (Direct Stream Digital). For
+DSD, there are special cases such as ``dsd64``, which allows you to
+omit the sample rate (e.g. ``dsd512:2`` for stereo DSD512,
+i.e. 22.5792 MHz).
+
+The sample rate is special for DSD: :program:`MPD` counts the number
+of bytes, not bits. Thus, a DSD "bit" rate of 22.5792 MHz (DSD512) is
+2822400 from :program:`MPD`'s point of view (44100*512/8).
 
 Resampler
 ~~~~~~~~~
@@ -531,6 +566,12 @@ choice::
 
  bind_to_address "/var/run/mpd/socket"
 
+On Linux, local sockets can be bound to a name without a socket inode
+on the filesystem; MPD implements this by prepending ``@`` to the
+address::
+
+ bind_to_address "@mpd"
+
 If no port is specified, the default port is 6600.  This default can
 be changed with the port setting::
 
@@ -860,7 +901,7 @@ To verify if :program:`MPD` converts the audio format, enable verbose logging, a
 .. code-block:: none
 
     decoder: audio_format=44100:24:2, seekable=true
-    output: opened plugin=alsa name="An ALSA output"audio_format=44100:16:2
+    output: opened plugin=alsa name="An ALSA output" audio_format=44100:16:2
     output: converting from 44100:24:2
 
 This example shows that a 24 bit file is being played, but the sound chip cannot play 24 bit. It falls back to 16 bit, discarding 8 bit.
@@ -887,7 +928,7 @@ Check list for bit-perfect playback:
   device (:samp:`hw:0,0` or similar).
 * Don't use software volume (setting :code:`mixer_type`).
 * Don't force :program:`MPD` to use a specific audio format (settings
-  :code:`format`, :code:`audio_output_format`).
+  :code:`format`, :ref:`audio_output_format <audio_output_format>`).
 * Verify that you are really doing bit-perfect playback using :program:`MPD`'s verbose log and :file:`/proc/asound/card*/pcm*p/sub*/hw_params`. Some DACs can also indicate the audio format.
 
 Direct Stream Digital (DSD)

meson.build

@@ -1,8 +1,8 @@
 project(
   'mpd',
   ['c', 'cpp'],
-  version: '0.21.5',
-  meson_version: '>= 0.47.2',
+  version: '0.21.9',
+  meson_version: '>= 0.49.0',
   default_options: [
     'c_std=c99',
     'cpp_std=c++14'
@@ -20,7 +20,7 @@ conf.set_quoted('PACKAGE', meson.project_name())
 conf.set_quoted('PACKAGE_NAME', meson.project_name())
 conf.set_quoted('PACKAGE_VERSION', meson.project_version())
 conf.set_quoted('VERSION', meson.project_version())
-conf.set_quoted('PROTOCOL_VERSION', '0.21.4')
+conf.set_quoted('PROTOCOL_VERSION', '0.21.6')
 conf.set_quoted('SYSTEM_CONFIG_FILE_LOCATION', join_paths(get_option('prefix'), get_option('sysconfdir'), 'mpd.conf'))
 
 common_cppflags = [
@@ -367,8 +367,10 @@ basic_dep = declare_dependency(
 
 if enable_database
   subdir('src/storage')
-  subdir('src/db')
+else
+  storage_glue_dep = dependency('', required: false)
 endif
+subdir('src/db')
 
 if neighbor_glue_dep.found()
   sources += 'src/command/NeighborCommands.cxx'
@@ -390,6 +392,7 @@ more_deps = []
 if is_android
   subdir('src/java')
   target_type = 'shared_library'
+  target_name = 'mpd'
   link_args += [
     '-Wl,--no-undefined,-shared,-Bsymbolic',
     '-llog',
@@ -399,12 +402,20 @@ if is_android
     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(
-  'mpd',
+  target_name,
   sources,
   target_type: target_type,
   include_directories: inc,
@@ -443,6 +454,14 @@ 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)

python/build/libs.py

@@ -112,8 +112,8 @@ liblame = AutotoolsProject(
 )
 
 ffmpeg = FfmpegProject(
-    'http://ffmpeg.org/releases/ffmpeg-4.1.1.tar.xz',
-    '373749824dfd334d84e55dff406729edfd1606575ee44dd485d97d45ea4d2d86',
+    'http://ffmpeg.org/releases/ffmpeg-4.1.3.tar.xz',
+    '0c3020452880581a8face91595b239198078645e7d7184273b8bcc7758beb63d',
     'lib/libavcodec.a',
     [
         '--disable-shared', '--enable-static',
@@ -341,8 +341,8 @@ ffmpeg = FfmpegProject(
 )
 
 curl = AutotoolsProject(
-    'http://curl.haxx.se/download/curl-7.64.0.tar.xz',
-    '2f2f13fa34d44aa29cb444077ad7dc4dc6d189584ad552e0aaeb06e608af6001',
+    'http://curl.haxx.se/download/curl-7.64.1.tar.xz',
+    '9252332a7f871ce37bfa7f78bdd0a0e3924d8187cc27cb57c76c9474a7168fb3',
     'lib/libcurl.a',
     [
         '--disable-shared', '--enable-static',
@@ -375,8 +375,8 @@ libexpat = AutotoolsProject(
 )
 
 libnfs = AutotoolsProject(
-    'https://github.com/sahlberg/libnfs/archive/libnfs-3.0.0.tar.gz',
-    '445d92c5fc55e4a5b115e358e60486cf8f87ee50e0103d46a02e7fb4618566a5',
+    'https://github.com/sahlberg/libnfs/archive/libnfs-4.0.0.tar.gz',
+    '6ee77e9fe220e2d3e3b1f53cfea04fb319828cc7dbb97dd9df09e46e901d797d',
     'lib/libnfs.a',
     [
         '--disable-shared', '--enable-static',
@@ -387,12 +387,12 @@ libnfs = AutotoolsProject(
 
         '--disable-utils', '--disable-examples',
     ],
-    base='libnfs-libnfs-3.0.0',
+    base='libnfs-libnfs-4.0.0',
     autoreconf=True,
 )
 
 boost = BoostProject(
-    'http://downloads.sourceforge.net/project/boost/boost/1.69.0/boost_1_69_0.tar.bz2',
-    '8f32d4617390d1c2d16f26a27ab60d97807b35440d45891fa340fc2648b04406',
+    'http://downloads.sourceforge.net/project/boost/boost/1.70.0/boost_1_70_0.tar.bz2',
+    '430ae8354789de4fd19ee52f3b1f739e1fba576f0aded0897c3c2bc00fb38778',
     'include/boost/version.hpp',
 )

src/CommandLine.cxx

@@ -108,17 +108,17 @@ static constexpr Domain cmdline_domain("cmdline");
 gcc_noreturn
 static void version(void)
 {
-	printf("Music Player Daemon " VERSION " (%s)\n"
+	printf("Music Player Daemon " VERSION " (%s)"
 	       "\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"
-	       "Database plugins:\n",
-	       GIT_VERSION);
+	printf("\n"
+	       "Database plugins:\n");
 
 	for (auto i = database_plugins; *i != nullptr; ++i)
 		printf(" %s", (*i)->name);
@@ -129,18 +129,18 @@ 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");
 

src/LocateUri.cxx

@@ -55,14 +55,26 @@ 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) {
@@ -76,7 +88,8 @@ 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
@@ -100,7 +113,7 @@ 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

@@ -41,6 +41,12 @@ class Client;
 class Storage;
 #endif
 
+enum class UriPluginKind {
+	INPUT,
+	STORAGE,
+	PLAYLIST,
+};
+
 struct LocatedUri {
 	enum class Type {
 		/**
@@ -84,7 +90,8 @@ 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/PlaylistFile.cxx

@@ -134,7 +134,9 @@ LoadPlaylistFileInfo(PlaylistInfo &info,
 	const auto *const name_fs_end =
 		FindStringSuffix(name_fs_str,
 				 PATH_LITERAL(PLAYLIST_FILE_SUFFIX));
-	if (name_fs_end == nullptr)
+	if (name_fs_end == nullptr ||
+	    /* no empty playlist names (raw file name = ".m3u") */
+	    name_fs_end == name_fs_str)
 		return false;
 
 	FileInfo fi;

src/SongLoader.cxx

@@ -94,7 +94,8 @@ SongLoader::LoadSong(const char *uri_utf8) const
 	assert(uri_utf8 != nullptr);
 #endif
 
-	const auto located_uri = LocateUri(uri_utf8, client
+	const auto located_uri = LocateUri(UriPluginKind::INPUT,
+					   uri_utf8, client
 #ifdef ENABLE_DATABASE
 					   , storage
 #endif

src/command/DatabaseCommands.cxx

@@ -268,7 +268,10 @@ handle_list(Client &client, Request args, Response &r)
 	std::unique_ptr<SongFilter> filter;
 	TagType group = TAG_NUM_OF_ITEM_TYPES;
 
-	if (args.size == 1) {
+	if (args.size == 1 &&
+	    /* parantheses are the syntax for filter expressions: no
+	       compatibility mode */
+	    args.front()[0] != '(') {
 		/* for compatibility with < 0.12.0 */
 		if (tagType != TAG_ALBUM) {
 			r.FormatError(ACK_ERROR_ARG,

src/command/FileCommands.cxx

@@ -218,7 +218,7 @@ handle_read_comments(Client &client, Request args, Response &r)
 
 	const char *const uri = args.front();
 
-	const auto located_uri = LocateUri(uri, &client
+	const auto located_uri = LocateUri(UriPluginKind::INPUT, uri, &client
 #ifdef ENABLE_DATABASE
 					   , nullptr
 #endif
@@ -331,7 +331,7 @@ handle_album_art(Client &client, Request args, Response &r)
 	const char *uri = args.front();
 	size_t offset = args.ParseUnsigned(1);
 
-	const auto located_uri = LocateUri(uri, &client
+	const auto located_uri = LocateUri(UriPluginKind::INPUT, uri, &client
 #ifdef ENABLE_DATABASE
 					   , nullptr
 #endif

src/command/OtherCommands.cxx

@@ -99,7 +99,7 @@ handle_listfiles(Client &client, Request args, Response &r)
 	/* default is root directory */
 	const auto uri = args.GetOptional(0, "");
 
-	const auto located_uri = LocateUri(uri, &client
+	const auto located_uri = LocateUri(UriPluginKind::STORAGE, uri, &client
 #ifdef ENABLE_DATABASE
 					   , nullptr
 #endif
@@ -219,7 +219,7 @@ handle_lsinfo(Client &client, Request args, Response &r)
 		   compatibility, work around this here */
 		uri = "";
 
-	const auto located_uri = LocateUri(uri, &client
+	const auto located_uri = LocateUri(UriPluginKind::INPUT, uri, &client
 #ifdef ENABLE_DATABASE
 					   , nullptr
 #endif

src/command/PlaylistCommands.cxx

@@ -20,6 +20,7 @@
 #include "config.h"
 #include "PlaylistCommands.hxx"
 #include "Request.hxx"
+#include "Instance.hxx"
 #include "db/DatabasePlaylist.hxx"
 #include "CommandError.hxx"
 #include "PlaylistSave.hxx"
@@ -27,6 +28,7 @@
 #include "PlaylistError.hxx"
 #include "db/PlaylistVector.hxx"
 #include "SongLoader.hxx"
+#include "song/DetachedSong.hxx"
 #include "BulkEdit.hxx"
 #include "playlist/PlaylistQueue.hxx"
 #include "playlist/Print.hxx"
@@ -38,6 +40,7 @@
 #include "util/UriUtil.hxx"
 #include "util/ConstBuffer.hxx"
 #include "util/ChronoUtil.hxx"
+#include "LocateUri.hxx"
 
 bool
 playlist_commands_available() noexcept
@@ -66,22 +69,43 @@ handle_save(Client &client, Request args, gcc_unused Response &r)
 CommandResult
 handle_load(Client &client, Request args, gcc_unused Response &r)
 {
+	const auto uri = LocateUri(UriPluginKind::PLAYLIST, args.front(),
+				   &client
+#ifdef ENABLE_DATABASE
+					   , nullptr
+#endif
+					   );
 	RangeArg range = args.ParseOptional(1, RangeArg::All());
 
 	const ScopeBulkEdit bulk_edit(client.GetPartition());
 
+	auto &playlist = client.GetPlaylist();
+	const unsigned old_size = playlist.GetLength();
+
 	const SongLoader loader(client);
-	playlist_open_into_queue(args.front(),
+	playlist_open_into_queue(uri,
 				 range.start, range.end,
-				 client.GetPlaylist(),
+				 playlist,
 				 client.GetPlayerControl(), loader);
+
+	/* invoke the RemoteTagScanner on all newly added songs */
+	auto &instance = client.GetInstance();
+	const unsigned new_size = playlist.GetLength();
+	for (unsigned i = old_size; i < new_size; ++i)
+		instance.LookupRemoteTag(playlist.queue.Get(i).GetURI());
+
 	return CommandResult::OK;
 }
 
 CommandResult
 handle_listplaylist(Client &client, Request args, Response &r)
 {
-	const char *const name = args.front();
+	const auto name = LocateUri(UriPluginKind::PLAYLIST, args.front(),
+				    &client
+#ifdef ENABLE_DATABASE
+					   , nullptr
+#endif
+					   );
 
 	if (playlist_file_print(r, client.GetPartition(), SongLoader(client),
 				name, false))
@@ -93,7 +117,12 @@ handle_listplaylist(Client &client, Request args, Response &r)
 CommandResult
 handle_listplaylistinfo(Client &client, Request args, Response &r)
 {
-	const char *const name = args.front();
+	const auto name = LocateUri(UriPluginKind::PLAYLIST, args.front(),
+				    &client
+#ifdef ENABLE_DATABASE
+					   , nullptr
+#endif
+					   );
 
 	if (playlist_file_print(r, client.GetPartition(), SongLoader(client),
 				name, true))

src/command/QueueCommands.cxx

@@ -83,7 +83,8 @@ handle_add(Client &client, Request args, Response &r)
 		   here */
 		uri = "";
 
-	const auto located_uri = LocateUri(uri, &client
+	const auto located_uri = LocateUri(UriPluginKind::INPUT, uri,
+					   &client
 #ifdef ENABLE_DATABASE
 					   , nullptr
 #endif

src/config/Net.cxx

@@ -29,6 +29,8 @@ ServerSocketAddGeneric(ServerSocket &server_socket, const char *address, unsigne
 		server_socket.AddPort(port);
 	} else if (address[0] == '/' || address[0] == '~') {
 		server_socket.AddPath(ParsePath(address));
+	} else if (address[0] == '@') {
+		server_socket.AddAbstract(address);
 	} else {
 		server_socket.AddHost(address, port);
 	}

src/config/Net.hxx

@@ -23,14 +23,14 @@
 class ServerSocket;
 
 /**
- * Sets the address or unix socket of a ServerSocket instance
+ * Sets the address or local socket of a ServerSocket instance
  * There are three possible ways
  * 1) Set address to a valid ip address and specify port.
  *    server_socket will listen on this address/port tuple.
  * 2) Set address to null and specify port.
  *    server_socket will listen on ANY address on that port.
- * 3) Set address to a path of a unix socket. port is ignored.
- *    server_socket will listen on this unix socket.
+ * 3) Set address to a path of a local socket. port is ignored.
+ *    server_socket will listen on this local socket.
  *
  * Throws #std::runtime_error on error.
  *

src/db/meson.build

@@ -9,6 +9,11 @@ db_api_dep = declare_dependency(
   link_with: db_api,
 )
 
+if not enable_database
+  db_glue_dep = db_api_dep
+  subdir_done()
+endif
+
 subdir('plugins')
 
 db_glue_sources = [

src/db/plugins/ProxyDatabasePlugin.cxx

@@ -568,7 +568,8 @@ ProxyDatabase::OnSocketReady(gcc_unused unsigned flags) noexcept
 	if (!is_idle) {
 		// TODO: can this happen?
 		IdleMonitor::Schedule();
-		return false;
+		SocketMonitor::Cancel();
+		return true;
 	}
 
 	unsigned idle = (unsigned)mpd_recv_idle(connection, false);
@@ -586,7 +587,8 @@ ProxyDatabase::OnSocketReady(gcc_unused unsigned flags) noexcept
 	idle_received |= idle;
 	is_idle = false;
 	IdleMonitor::Schedule();
-	return false;
+	SocketMonitor::Cancel();
+	return true;
 }
 
 void

src/decoder/plugins/HybridDsdDecoderPlugin.cxx

@@ -39,8 +39,8 @@ InitHybridDsdDecoder(const ConfigBlock &block)
 	   without a DSD DAC, the PCM (=ALAC) part of the file is
 	   better */
 	if (block.GetBlockParam("enabled") == nullptr) {
-		LogInfo(hybrid_dsd_domain,
-			"The Hybrid DSD decoder is disabled because it was not explicitly enabled");
+		LogDebug(hybrid_dsd_domain,
+			 "The Hybrid DSD decoder is disabled because it was not explicitly enabled");
 		return false;
 	}
 

src/decoder/plugins/OpusDecoderPlugin.cxx

@@ -208,10 +208,12 @@ MPDOpusDecoder::HandleTags(const ogg_packet &packet)
 	TagBuilder tag_builder;
 	AddTagHandler h(tag_builder);
 
-	if (ScanOpusTags(packet.packet, packet.bytes, &rgi, h) &&
-	    !tag_builder.empty()) {
-		client.SubmitReplayGain(&rgi);
+	if (!ScanOpusTags(packet.packet, packet.bytes, &rgi, h))
+		return;
 
+	client.SubmitReplayGain(&rgi);
+
+	if (!tag_builder.empty()) {
 		Tag tag = tag_builder.Commit();
 		auto cmd = client.SubmitTag(input_stream, std::move(tag));
 		if (cmd != DecoderCommand::NONE)

src/event/BufferedSocket.cxx

@@ -110,15 +110,9 @@ BufferedSocket::OnSocketReady(unsigned flags) noexcept
 	if (flags & READ) {
 		assert(!input.IsFull());
 
-		if (!ReadToBuffer())
+		if (!ReadToBuffer() || !ResumeInput())
 			return false;
 
-		if (!ResumeInput())
-			/* we must return "true" here or
-			   SocketMonitor::Dispatch() will call
-			   Cancel() on a freed object */
-			return true;
-
 		if (!input.IsFull())
 			ScheduleRead();
 	}

src/event/BufferedSocket.hxx

@@ -46,6 +46,11 @@ public:
 	using SocketMonitor::Close;
 
 private:
+	/**
+	 * @return the number of bytes read from the socket, 0 if the
+	 * socket isn't ready for reading, -1 on error (the socket has
+	 * been closed and probably destructed)
+	 */
 	ssize_t DirectRead(void *data, size_t length) noexcept;
 
 	/**

src/event/FullyBufferedSocket.hxx

@@ -45,6 +45,11 @@ public:
 	}
 
 private:
+	/**
+	 * @return the number of bytes written to the socket, 0 if the
+	 * socket isn't ready for writing, -1 on error (the socket has
+	 * been closed and probably destructed)
+	 */
 	ssize_t DirectWrite(const void *data, size_t length) noexcept;
 
 protected:

src/event/ServerSocket.cxx

@@ -392,7 +392,29 @@ ServerSocket::AddPath(AllocatedPath &&path)
 #else /* !HAVE_UN */
 	(void)path;
 
-	throw std::runtime_error("UNIX domain socket support is disabled");
+	throw std::runtime_error("Local socket support is disabled");
 #endif /* !HAVE_UN */
 }
 
+
+void
+ServerSocket::AddAbstract(const char *name)
+{
+#if !defined(__linux__)
+	(void)name;
+
+	throw std::runtime_error("Abstract sockets are only available on Linux");
+#elif !defined(HAVE_UN)
+	(void)name;
+
+	throw std::runtime_error("Local socket support is disabled");
+#else
+	assert(name != nullptr);
+	assert(*name == '@');
+
+	AllocatedSocketAddress address;
+	address.SetLocal(name);
+
+	AddAddress(std::move(address));
+#endif
+}

src/event/ServerSocket.hxx

@@ -90,7 +90,7 @@ public:
 	void AddHost(const char *hostname, unsigned port);
 
 	/**
-	 * Add a listener on a Unix domain socket.
+	 * Add a listener on a local socket.
 	 *
 	 * Throws #std::runtime_error on error.
 	 *
@@ -99,6 +99,16 @@ public:
 	 */
 	void AddPath(AllocatedPath &&path);
 
+	/**
+	 * Add a listener on an abstract local socket (Linux specific).
+	 *
+	 * Throws on error.
+	 *
+	 * @param name the abstract socket name, starting with a '@'
+	 * instead of a null byte
+	 */
+	void AddAbstract(const char *name);
+
 	/**
 	 * Add a socket descriptor that is accepting connections.  After this
 	 * has been called, don't call server_socket_open(), because the

src/event/SocketMonitor.cxx

@@ -33,8 +33,8 @@ SocketMonitor::Dispatch(unsigned flags) noexcept
 {
 	flags &= GetScheduledFlags();
 
-	if (flags != 0 && !OnSocketReady(flags) && IsDefined())
-		Cancel();
+	if (flags != 0)
+		OnSocketReady(flags);
 }
 
 SocketMonitor::~SocketMonitor() noexcept

src/filter/Filter.hxx

@@ -65,7 +65,7 @@ public:
 
 	/**
 	 * Flush pending data and return it.  This should be called
-	 * repepatedly until it returns nullptr.
+	 * repeatedly until it returns nullptr.
 	 */
 	virtual ConstBuffer<void> Flush();
 };

src/filter/plugins/AutoConvertFilterPlugin.cxx

@@ -56,6 +56,7 @@ public:
 	}
 
 	ConstBuffer<void> FilterPCM(ConstBuffer<void> src) override;
+	ConstBuffer<void> Flush() override;
 };
 
 class PreparedAutoConvertFilter final : public PreparedFilter {
@@ -104,6 +105,18 @@ AutoConvertFilter::FilterPCM(ConstBuffer<void> src)
 	return filter->FilterPCM(src);
 }
 
+ConstBuffer<void>
+AutoConvertFilter::Flush()
+{
+	if (convert != nullptr) {
+		auto result = convert->Flush();
+		if (!result.IsNull())
+			return filter->FilterPCM(result);
+	}
+
+	return filter->Flush();
+}
+
 std::unique_ptr<PreparedFilter>
 autoconvert_filter_new(std::unique_ptr<PreparedFilter> filter) noexcept
 {

src/haiku/add_resources.sh

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+cp "$2" "$1" && xres -o "$1" -- "$3" && mimeset -f "$1" || (rm -f "$1"; exit 1)

src/haiku/meson.build

@@ -1,18 +1,26 @@
-rc = meson.find_program('rc')
-xres = meson.find_program('xres')
+haiku_conf = configuration_data()
+haiku_conf.set('VERSION', meson.project_version())
+
+splitted_version = meson.project_version().split('~')[0].split('.')
+haiku_conf.set('VERSION_MAJOR', splitted_version[0])
+haiku_conf.set('VERSION_MINOR', splitted_version.get(1, '0'))
+haiku_conf.set('VERSION_REVISION', splitted_version.get(2, '0'))
+haiku_conf.set('VERSION_EXTRA', splitted_version.get(3, '0'))
+
+mpd_rdef = configure_file(
+  input: 'mpd.rdef.in',
+  output: 'mpd.rdef',
+  configuration: haiku_conf,
+)
+
+rc = find_program('rc')
+xres = find_program('xres')
 
 rsrc = custom_target(
   'mpd.rsrc',
   output: 'mpd.rsrc',
-  input: 'mpd.rdef',
+  input: mpd_rdef,
   command: [rc, '-o', '@OUTPUT@', '@INPUT@'],
 )
 
-custom_target(
-  'mpd.rsrc',
-  output: 'mpd',
-  input: [mpd, rsrc],
-  command: [xres, '-o', '@OUTPUT@', '--', '@INPUT@'],
-  install: true,
-  install_dir: get_option('bindir'),
-)
+addres = files('add_resources.sh')

src/haiku/mpd.rdef.in

@@ -2,7 +2,15 @@ resource app_signature "application/x-vnd.MusicPD";
 
 resource app_flags B_BACKGROUND_APP;
 
-// TODO: resource app_version {};
+resource app_version {
+	major = @VERSION_MAJOR@,
+	middle = @VERSION_MINOR@,
+	minor = @VERSION_REVISION@,
+	variety = B_APPV_ALPHA,
+	internal = @VERSION_EXTRA@,
+	short_info = "Music Player Daemon @VERSION@",
+    long_info  = "Music Player Daemon @VERSION@ ©The Music Player Daemon Project"
+};
 
 resource vector_icon {
 	$"6E6369661F050102031604BEE29BBEC5403EC540BEE29B4A10004A10000001C6"

src/input/BufferedInputStream.cxx

@@ -59,6 +59,9 @@ BufferedInputStream::~BufferedInputStream() noexcept
 void
 BufferedInputStream::Check()
 {
+	if (read_error)
+		std::rethrow_exception(read_error);
+
 	if (input)
 		input->Check();
 }
@@ -101,7 +104,7 @@ BufferedInputStream::IsEOF() noexcept
 bool
 BufferedInputStream::IsAvailable() noexcept
 {
-	return IsEOF() || buffer.Read(offset).HasData();
+	return IsEOF() || buffer.Read(offset).HasData() || read_error;
 }
 
 size_t
@@ -164,6 +167,32 @@ BufferedInputStream::RunThread() noexcept
 			idle = false;
 			seek = false;
 			client_cond.signal();
+		} else if (!idle && !read_error &&
+			   offset != input->GetOffset() &&
+			   !IsAvailable()) {
+			/* a past Seek() call was a no-op because data
+			   was already available at that position, but
+			   now we've reached a new position where
+			   there is no more data in the buffer, and
+			   our input is reading somewhere else (maybe
+			   stuck at the end of the file); to find a
+			   way out, we now seek our input to our
+			   reading position to be able to fill our
+			   buffer */
+
+			try {
+				input->Seek(offset);
+			} catch (...) {
+				/* this is really a seek error, but we
+				   register it as a read_error,
+				   because seek_error is only checked
+				   by Seek(), and at our frontend (our
+				   own InputStream interface) is in
+				   "read" mode */
+				read_error = std::current_exception();
+				client_cond.signal();
+				InvokeOnAvailable();
+			}
 		} else if (!idle && !read_error &&
 			   input->IsAvailable() && !input->IsEOF()) {
 			const auto read_offset = input->GetOffset();

src/input/plugins/CurlInputPlugin.cxx

@@ -306,9 +306,8 @@ input_curl_init(EventLoop &event_loop, const ConfigBlock &block)
 {
 	try {
 		curl_init = new CurlInit(event_loop);
-	} catch (const std::runtime_error &e) {
-		LogError(e);
-		throw PluginUnavailable(e.what());
+	} catch (...) {
+		std::throw_with_nested(PluginUnavailable("CURL initialization failed"));
 	}
 
 	const auto version_info = curl_version_info(CURLVERSION_FIRST);

src/input/plugins/SmbclientInputPlugin.cxx

@@ -22,14 +22,13 @@
 #include "lib/smbclient/Mutex.hxx"
 #include "../InputStream.hxx"
 #include "../InputPlugin.hxx"
+#include "../MaybeBufferedInputStream.hxx"
 #include "PluginUnavailable.hxx"
 #include "system/Error.hxx"
 #include "util/ASCII.hxx"
 
 #include <libsmbclient.h>
 
-#include <stdexcept>
-
 class SmbclientInputStream final : public InputStream {
 	SMBCCTX *ctx;
 	int fd;
@@ -72,9 +71,8 @@ input_smbclient_init(EventLoop &, const ConfigBlock &)
 {
 	try {
 		SmbclientInit();
-	} catch (const std::runtime_error &e) {
-		// TODO: use std::throw_with_nested()?
-		throw PluginUnavailable(e.what());
+	} catch (...) {
+		std::throw_with_nested(PluginUnavailable("libsmbclient initialization failed"));
 	}
 
 	// TODO: create one global SMBCCTX here?
@@ -115,8 +113,9 @@ input_smbclient_open(const char *uri,
 		throw MakeErrno(e, "smbc_fstat() failed");
 	}
 
-	return std::make_unique<SmbclientInputStream>(uri, mutex,
-						      ctx, fd, st);
+	return std::make_unique<MaybeBufferedInputStream>
+		(std::make_unique<SmbclientInputStream>(uri, mutex,
+							ctx, fd, st));
 }
 
 size_t

src/lib/cdio/Paranoia.hxx

@@ -43,6 +43,8 @@
 #include <stdexcept>
 #include <utility>
 
+#include <cstdio>
+
 class CdromDrive {
 	cdrom_drive_t *drv = nullptr;
 

src/lib/gcrypt/meson.build

@@ -1,4 +1,17 @@
+# Since version 0.49.0 Meson has native libgcrypt dependency support, which has
+# the advantage over find_library() as it uses libgcrypt-config to query the
+# required linker flags.
+# However, we still need to use find_library() first, to prevent Meson
+# falsly assuming a target libgcrypt is available in case there is no
+# libgcrypt-config entry in the cross file and libgcrypt is installed on the
+# host. In this case, Meson will falsly use the native libgcrypt-config and
+# will falsly assume it has found the gcrypt library for the target.
+#
+# See: https://github.com/MusicPlayerDaemon/MPD/pull/495
 gcrypt_dep = c_compiler.find_library('gcrypt', required: get_option('qobuz'))
+if gcrypt_dep.found()
+  gcrypt_dep = dependency('libgcrypt')
+endif
 if not gcrypt_dep.found()
   subdir_done()
 endif

src/lib/xiph/OggVisitor.cxx

@@ -20,6 +20,7 @@
 #include "OggVisitor.hxx"
 
 #include <stdexcept>
+#include <utility>
 
 void
 OggVisitor::EndStream()
@@ -51,7 +52,13 @@ OggVisitor::ReadNextPage()
 inline void
 OggVisitor::HandlePacket(const ogg_packet &packet)
 {
+	const bool _post_seek = std::exchange(post_seek, false);
+
 	if (packet.b_o_s) {
+		if (_post_seek)
+			/* ignore the BOS packet after seeking */
+			return;
+
 		EndStream();
 		has_stream = true;
 		OnOggBeginning(packet);
@@ -97,4 +104,6 @@ OggVisitor::PostSeek()
 
 	/* find the next Ogg page and feed it into the stream */
 	sync.ExpectPageSeekIn(stream);
+
+	post_seek = true;
 }

src/lib/xiph/OggVisitor.hxx

@@ -39,6 +39,14 @@ class OggVisitor {
 
 	bool has_stream = false;
 
+	/**
+	 * This is true after seeking; its one-time effect is to
+	 * ignore the BOS packet, just in case we have been seeking to
+	 * the beginning of the file, because that would disrupt
+	 * playback.
+	 */
+	bool post_seek = false;
+
 public:
 	explicit OggVisitor(Reader &reader)
 		:sync(reader), stream(0) {}

src/lib/xiph/meson.build

@@ -1,7 +1,20 @@
 libflac_dep = dependency('flac', version: '>= 1.2', required: get_option('flac'))
 libopus_dep = dependency('opus', required: get_option('opus'))
-libvorbis_dep = dependency('vorbis', required: get_option('vorbis'))
-libvorbisidec_dep = dependency('vorbisidec', required: get_option('tremor'))
+
+if get_option('tremor').enabled()
+  # no libvorbis if Tremor was explicitly enabled
+  libvorbis_dep = dependency('', required: false)
+else
+  libvorbis_dep = dependency('vorbis', required: get_option('vorbis'))
+endif
+
+if libvorbis_dep.found()
+  # no Tremor if libvorbis is used
+  libvorbisidec_dep = dependency('', required: false)
+else
+  # attempt to auto-detect Tremor only if libvorbis was disabled or not found
+  libvorbisidec_dep = dependency('vorbisidec', required: get_option('tremor'))
+endif
 
 if get_option('vorbis').enabled() and get_option('tremor').enabled()
 	error('Cannot build both, the Vorbis decoder AND the Tremor (Vorbis fixed-point) decoder')

src/neighbor/plugins/SmbclientNeighborPlugin.cxx

@@ -150,8 +150,6 @@ ReadServers(NeighborExplorer::List &list, int fd)
 	smbc_dirent *e;
 	while ((e = smbc_readdir(fd)) != nullptr)
 		ReadEntry(list, *e);
-
-	smbc_closedir(fd);
 }
 
 static void

src/net/IPv4Address.hxx

@@ -168,7 +168,7 @@ public:
 	}
 
 	constexpr operator SocketAddress() const noexcept {
-		return SocketAddress((const struct sockaddr *)&address,
+		return SocketAddress((const struct sockaddr *)(const void *)&address,
 				     sizeof(address));
 	}
 

src/net/IPv6Address.hxx

@@ -135,7 +135,7 @@ public:
 	}
 
 	constexpr operator SocketAddress() const noexcept {
-		return SocketAddress((const struct sockaddr *)&address,
+		return SocketAddress((const struct sockaddr *)(const void *)&address,
 				     sizeof(address));
 	}
 

src/net/SocketDescriptor.cxx

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012-2017 Max Kellermann <max.kellermann@gmail.com>
+ * Copyright 2012-2019 Max Kellermann <max.kellermann@gmail.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -315,6 +315,13 @@ SocketDescriptor::SetTcpDeferAccept(const int &seconds) noexcept
 	return SetOption(IPPROTO_TCP, TCP_DEFER_ACCEPT, &seconds, sizeof(seconds));
 }
 
+bool
+SocketDescriptor::SetTcpUserTimeout(const unsigned &milliseconds) noexcept
+{
+	return SetOption(IPPROTO_TCP, TCP_USER_TIMEOUT,
+			 &milliseconds, sizeof(milliseconds));
+}
+
 bool
 SocketDescriptor::SetV6Only(bool value) noexcept
 {

src/net/SocketDescriptor.hxx

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012-2017 Max Kellermann <max.kellermann@gmail.com>
+ * Copyright 2012-2019 Max Kellermann <max.kellermann@gmail.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -188,6 +188,12 @@ public:
 	bool SetCork(bool value=true) noexcept;
 
 	bool SetTcpDeferAccept(const int &seconds) noexcept;
+
+	/**
+	 * Setter for TCP_USER_TIMEOUT.
+	 */
+	bool SetTcpUserTimeout(const unsigned &milliseconds) noexcept;
+
 	bool SetV6Only(bool value) noexcept;
 
 	/**

src/net/SocketUtil.cxx

@@ -35,7 +35,7 @@ socket_bind_listen(int domain, int type, int protocol,
 		throw MakeSocketError("Failed to create socket");
 
 #ifdef HAVE_UN
-	if (domain == AF_UNIX) {
+	if (domain == AF_LOCAL) {
 		/* Prevent access until right permissions are set */
 		fchmod(fd.Get(), 0);
 	}

src/net/SocketUtil.hxx

@@ -32,7 +32,7 @@ class SocketAddress;
 /**
  * Creates a socket listening on the specified address.  This is a
  * shortcut for socket(), bind() and listen().
- * When a unix socket is created (domain == AF_UNIX), its
+ * When a local socket is created (domain == AF_LOCAL), its
  * permissions will be stripped down to prevent unauthorized
  * access. The caller is responsible to apply proper permissions
  * at a later point.

src/net/StaticSocketAddress.cxx

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012-2017 Max Kellermann <max.kellermann@gmail.com>
+ * Copyright 2012-2019 Max Kellermann <max.kellermann@gmail.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -29,6 +29,7 @@
 
 #include "config.h"
 #include "StaticSocketAddress.hxx"
+#include "util/StringView.hxx"
 
 #include <algorithm>
 
@@ -50,6 +51,16 @@ StaticSocketAddress::operator=(SocketAddress other) noexcept
 	return *this;
 }
 
+#ifdef HAVE_UN
+
+StringView
+StaticSocketAddress::GetLocalRaw() const noexcept
+{
+	return SocketAddress(*this).GetLocalRaw();
+}
+
+#endif
+
 #ifdef HAVE_TCP
 
 bool

src/net/StaticSocketAddress.hxx

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012-2017 Max Kellermann <max.kellermann@gmail.com>
+ * Copyright 2012-2019 Max Kellermann <max.kellermann@gmail.com>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -66,14 +66,6 @@ public:
 		return reinterpret_cast<const struct sockaddr *>(&address);
 	}
 
-	struct sockaddr *GetAddress() noexcept {
-		return reinterpret_cast<struct sockaddr *>(&address);
-	}
-
-	const struct sockaddr *GetAddress() const noexcept {
-		return reinterpret_cast<const struct sockaddr *>(&address);
-	}
-
 	constexpr size_type GetCapacity() const noexcept {
 		return sizeof(address);
 	}
@@ -109,6 +101,14 @@ public:
 		address.ss_family = AF_UNSPEC;
 	}
 
+#ifdef HAVE_UN
+	/**
+	 * @see SocketAddress::GetLocalRaw()
+	 */
+	gcc_pure
+	StringView GetLocalRaw() const noexcept;
+#endif
+
 #ifdef HAVE_TCP
 	/**
 	 * Extract the port number.  Returns 0 if not applicable.

src/net/ToString.cxx

@@ -106,7 +106,7 @@ ToString(SocketAddress address) noexcept
 {
 #ifdef HAVE_UN
 	if (address.GetFamily() == AF_LOCAL)
-		/* return path of UNIX domain sockets */
+		/* return path of local socket */
 		return LocalAddressToString(*(const sockaddr_un *)address.GetAddress(),
 					    address.GetSize());
 #endif

src/output/plugins/HaikuOutputPlugin.cxx

@@ -140,9 +140,6 @@ HaikuOutput::Close() noexcept
 
 HaikuOutput::~HaikuOutput()
 {
-	delete_sem(new_buffer);
-	delete_sem(buffer_done);
-
 	finalize_application();
 }
 

src/output/plugins/PulseOutputPlugin.cxx

@@ -581,8 +581,8 @@ PulseOutput::SetupStream(const pa_sample_spec &ss)
 
 	/* WAVE-EX is been adopted as the speaker map for most media files */
 	pa_channel_map chan_map;
-	pa_channel_map_init_auto(&chan_map, ss.channels,
-				 PA_CHANNEL_MAP_WAVEEX);
+	pa_channel_map_init_extend(&chan_map, ss.channels,
+				   PA_CHANNEL_MAP_WAVEEX);
 	stream = pa_stream_new(context, name, &ss, &chan_map);
 	if (stream == nullptr)
 		throw MakePulseError(context,

src/output/plugins/httpd/HttpdClient.cxx

@@ -154,7 +154,7 @@ HttpdClient::SendResponse() noexcept
 		FormatWarning(httpd_output_domain,
 			      "failed to write to client: %s",
 			      (const char *)msg);
-		Close();
+		LockClose();
 		return false;
 	}
 
@@ -428,6 +428,7 @@ void
 HttpdClient::OnSocketError(std::exception_ptr ep) noexcept
 {
 	LogError(ep);
+	LockClose();
 }
 
 void

src/output/plugins/httpd/HttpdClient.hxx

@@ -142,6 +142,8 @@ public:
 
 	/**
 	 * Frees the client and removes it from the server's client list.
+	 *
+	 * Caller must lock the mutex.
 	 */
 	void Close() noexcept;
 

src/output/plugins/httpd/HttpdInternal.hxx

@@ -208,10 +208,15 @@ public:
 		return HasClients();
 	}
 
+	/**
+	 * Caller must lock the mutex.
+	 */
 	void AddClient(UniqueSocketDescriptor fd) noexcept;
 
 	/**
 	 * Removes a client from the httpd_output.clients linked list.
+	 *
+	 * Caller must lock the mutex.
 	 */
 	void RemoveClient(HttpdClient &client) noexcept;
 
@@ -239,10 +244,14 @@ public:
 
 	/**
 	 * Broadcasts data from the encoder to all clients.
+	 *
+	 * Mutext must not be locked.
 	 */
 	void BroadcastFromEncoder();
 
 	/**
+	 * Mutext must not be locked.
+	 *
 	 * Throws #std::runtime_error on error.
 	 */
 	void EncodeAndPlay(const void *chunk, size_t size);
@@ -251,6 +260,9 @@ public:
 
 	size_t Play(const void *chunk, size_t size) override;
 
+	/**
+	 * Mutext must not be locked.
+	 */
 	void CancelAllClients() noexcept;
 
 	void Cancel() noexcept override;

src/output/plugins/meson.build

@@ -76,7 +76,10 @@ if is_darwin
   audiounit_dep = declare_dependency(
     link_args: [
       '-framework', 'AudioUnit', '-framework', 'CoreAudio', '-framework', 'CoreServices',
-    ]
+    ],
+    dependencies: [
+      boost_dep,
+    ],
   )
 else
   audiounit_dep = dependency('', required: false)

src/output/plugins/sles/SlesOutputPlugin.cxx

@@ -229,6 +229,14 @@ SlesOutput::Open(AudioFormat &audio_format)
 						    SL_ANDROID_KEY_STREAM_TYPE,
 						    &stream_type,
 						    sizeof(stream_type));
+
+		/* MPD doesn't care much about latency, so let's
+		   configure power saving mode */
+		SLuint32 performance_mode = SL_ANDROID_PERFORMANCE_POWER_SAVING;
+		(*android_config)->SetConfiguration(android_config,
+						    SL_ANDROID_KEY_PERFORMANCE_MODE,
+						    &performance_mode,
+						    sizeof(performance_mode));
 	}
 
 	result = play_object.Realize(false);

src/player/Thread.cxx

@@ -996,7 +996,7 @@ Player::Run() noexcept
 			}
 		}
 
-		if (dc.IsIdle() && queued && dc.pipe == pipe) {
+		if (dc.IsIdle() && queued) {
 			/* the decoder has finished the current song;
 			   make it decode the next song */
 
@@ -1058,6 +1058,16 @@ Player::Run() noexcept
 
 			SongBorder();
 		} else if (dc.IsIdle()) {
+			if (queued)
+				/* the decoder has just stopped,
+				   between the two IsIdle() checks,
+				   probably while UnlockCheckOutputs()
+				   left the mutex unlocked; to restart
+				   the decoder instead of stopping
+				   playback completely, let's re-enter
+				   this loop */
+				continue;
+
 			/* check the size of the pipe again, because
 			   the decoder thread may have added something
 			   since we last checked */

src/playlist/PlaylistAny.cxx

@@ -17,6 +17,7 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
+#include "LocateUri.hxx"
 #include "PlaylistAny.hxx"
 #include "PlaylistStream.hxx"
 #include "PlaylistMapper.hxx"
@@ -25,17 +26,26 @@
 #include "config.h"
 
 std::unique_ptr<SongEnumerator>
-playlist_open_any(const char *uri,
+playlist_open_any(const LocatedUri &located_uri,
 #ifdef ENABLE_DATABASE
 		  const Storage *storage,
 #endif
 		  Mutex &mutex)
 {
-	return uri_has_scheme(uri)
-		? playlist_open_remote(uri, mutex)
-		: playlist_mapper_open(uri,
+	switch (located_uri.type) {
+	case LocatedUri::Type::ABSOLUTE:
+		return playlist_open_remote(located_uri.canonical_uri, mutex);
+
+	case LocatedUri::Type::PATH:
+		return playlist_open_path(located_uri.path, mutex);
+
+	case LocatedUri::Type::RELATIVE:
+		return playlist_mapper_open(located_uri.canonical_uri,
 #ifdef ENABLE_DATABASE
 				       storage,
 #endif
 				       mutex);
+	}
+
+	gcc_unreachable();
 }

src/playlist/PlaylistAny.hxx

@@ -34,7 +34,7 @@ class Storage;
  * music or playlist directory.
  */
 std::unique_ptr<SongEnumerator>
-playlist_open_any(const char *uri,
+playlist_open_any(const LocatedUri &located_uri,
 #ifdef ENABLE_DATABASE
 		  const Storage *storage,
 #endif

src/playlist/PlaylistQueue.cxx

@@ -18,6 +18,7 @@
  */
 
 #include "config.h"
+#include "LocateUri.hxx"
 #include "PlaylistQueue.hxx"
 #include "PlaylistAny.hxx"
 #include "PlaylistSong.hxx"
@@ -63,7 +64,7 @@ playlist_load_into_queue(const char *uri, SongEnumerator &e,
 }
 
 void
-playlist_open_into_queue(const char *uri,
+playlist_open_into_queue(const LocatedUri &uri,
 			 unsigned start_index, unsigned end_index,
 			 playlist &dest, PlayerControl &pc,
 			 const SongLoader &loader)
@@ -78,7 +79,7 @@ playlist_open_into_queue(const char *uri,
 	if (playlist == nullptr)
 		throw PlaylistError::NoSuchList();
 
-	playlist_load_into_queue(uri, *playlist,
+	playlist_load_into_queue(uri.canonical_uri, *playlist,
 				 start_index, end_index,
 				 dest, pc, loader);
 }

src/playlist/PlaylistQueue.hxx

@@ -49,7 +49,7 @@ playlist_load_into_queue(const char *uri, SongEnumerator &e,
  * play queue.
  */
 void
-playlist_open_into_queue(const char *uri,
+playlist_open_into_queue(const LocatedUri &uri,
 			 unsigned start_index, unsigned end_index,
 			 playlist &dest, PlayerControl &pc,
 			 const SongLoader &loader);

src/playlist/Print.cxx

@@ -18,6 +18,7 @@
  */
 
 #include "config.h"
+#include "LocateUri.hxx"
 #include "Print.hxx"
 #include "PlaylistAny.hxx"
 #include "PlaylistSong.hxx"
@@ -55,7 +56,7 @@ playlist_provider_print(Response &r,
 bool
 playlist_file_print(Response &r, Partition &partition,
 		    const SongLoader &loader,
-		    const char *uri, bool detail)
+		    const LocatedUri &uri, bool detail)
 {
 	Mutex mutex;
 
@@ -71,6 +72,6 @@ playlist_file_print(Response &r, Partition &partition,
 	if (playlist == nullptr)
 		return false;
 
-	playlist_provider_print(r, loader, uri, *playlist, detail);
+	playlist_provider_print(r, loader, uri.canonical_uri, *playlist, detail);
 	return true;
 }

src/playlist/Print.hxx

@@ -34,6 +34,6 @@ struct Partition;
 bool
 playlist_file_print(Response &r, Partition &partition,
 		    const SongLoader &loader,
-		    const char *uri, bool detail);
+		    const LocatedUri &uri, bool detail);
 
 #endif

src/playlist/plugins/FlacPlaylistPlugin.cxx

@@ -34,7 +34,7 @@
 #include <FLAC/metadata.h>
 
 class FlacPlaylist final : public SongEnumerator {
-	const char *const uri;
+	const std::string uri;
 
 	FLAC__StreamMetadata *const cuesheet;
 	const unsigned sample_rate;

src/song/StringFilter.cxx

@@ -22,13 +22,10 @@
 
 #include <assert.h>
 
-inline bool
+bool
 StringFilter::MatchWithoutNegation(const char *s) const noexcept
 {
-#if !CLANG_CHECK_VERSION(3,6)
-	/* disabled on clang due to -Wtautological-pointer-compare */
 	assert(s != nullptr);
-#endif
 
 #ifdef HAVE_PCRE
 	if (regex)

src/song/StringFilter.hxx

@@ -105,7 +105,9 @@ public:
 	gcc_pure
 	bool Match(const char *s) const noexcept;
 
-private:
+	/**
+	 * Like Match(), but ignore the "negated" flag.
+	 */
 	gcc_pure
 	bool MatchWithoutNegation(const char *s) const noexcept;
 };

src/song/TagSongFilter.cxx

@@ -35,43 +35,41 @@ TagSongFilter::ToExpression() const noexcept
 }
 
 bool
-TagSongFilter::MatchNN(const TagItem &item) const noexcept
+TagSongFilter::Match(const Tag &tag) const noexcept
 {
-	return (type == TAG_NUM_OF_ITEM_TYPES || item.type == type) &&
-		filter.Match(item.value);
-}
-
-bool
-TagSongFilter::MatchNN(const Tag &tag) const noexcept
-{
-	bool visited_types[TAG_NUM_OF_ITEM_TYPES];
-	std::fill_n(visited_types, size_t(TAG_NUM_OF_ITEM_TYPES), false);
+	bool visited_types[TAG_NUM_OF_ITEM_TYPES]{};
 
 	for (const auto &i : tag) {
 		visited_types[i.type] = true;
 
-		if (MatchNN(i))
-			return true;
+		if ((type == TAG_NUM_OF_ITEM_TYPES || i.type == type) &&
+		    filter.MatchWithoutNegation(i.value))
+			return !filter.IsNegated();
 	}
 
 	if (type < TAG_NUM_OF_ITEM_TYPES && !visited_types[type]) {
+		/* if the specified tag is not present, try the
+		   fallback tags */
+
 		bool result = false;
-		if (ApplyTagFallback(type,
-				     [&](TagType tag2) {
-			     if (!visited_types[tag2])
-				     return false;
+		if (ApplyTagFallback(type, [&](TagType tag2) {
+			if (!visited_types[tag2])
+				/* we already know that this tag type
+				   isn't present, so let's bail out
+				   without checking again */
+				return false;
 
-			     for (const auto &item : tag) {
-				     if (item.type == tag2 &&
-					 filter.Match(item.value)) {
-					     result = true;
-					     break;
-				     }
-			     }
+			for (const auto &item : tag) {
+				if (item.type == tag2 &&
+				    filter.MatchWithoutNegation(item.value)) {
+					result = true;
+					break;
+				}
+			}
 
-			     return true;
-		     }))
-			return result;
+			return true;
+		}))
+			return result != filter.IsNegated();
 
 		/* If the search critieron was not visited during the
 		   sweep through the song's tag, it means this field
@@ -80,14 +78,14 @@ TagSongFilter::MatchNN(const Tag &tag) const noexcept
 		   then it's a match as well and we should return
 		   true. */
 		if (filter.empty())
-			return true;
+			return !filter.IsNegated();
 	}
 
-	return false;
+	return filter.IsNegated();
 }
 
 bool
 TagSongFilter::Match(const LightSong &song) const noexcept
 {
-	return MatchNN(song.tag);
+	return Match(song.tag);
 }

src/song/TagSongFilter.hxx

@@ -68,8 +68,7 @@ public:
 	bool Match(const LightSong &song) const noexcept override;
 
 private:
-	bool MatchNN(const Tag &tag) const noexcept;
-	bool MatchNN(const TagItem &tag) const noexcept;
+	bool Match(const Tag &tag) const noexcept;
 };
 
 #endif

src/system/UniqueFileDescriptor.hxx

@@ -79,6 +79,11 @@ public:
 		return FileDescriptor::CreatePipe(r, w);
 	}
 
+	static bool CreatePipeNonBlock(UniqueFileDescriptor &r,
+				       UniqueFileDescriptor &w) noexcept {
+		return FileDescriptor::CreatePipeNonBlock(r, w);
+	}
+
 	static bool CreatePipe(FileDescriptor &r, FileDescriptor &w) noexcept;
 #endif
 

src/tag/Fallback.hxx

@@ -22,6 +22,11 @@
 
 #include <utility>
 
+/**
+ * Invoke the given function for all fallback tags of the given
+ * #TagType, until the function returns true (or until there are no
+ * more fallback tags).
+ */
 template<typename F>
 bool
 ApplyTagFallback(TagType type, F &&f) noexcept
@@ -43,6 +48,11 @@ ApplyTagFallback(TagType type, F &&f) noexcept
 	return false;
 }
 
+/**
+ * Invoke the given function for the given #TagType and all of its
+ * fallback tags, until the function returns true (or until there are
+ * no more fallback tags).
+ */
 template<typename F>
 bool
 ApplyTagWithFallback(TagType type, F &&f) noexcept

src/thread/meson.build

@@ -1,4 +1,11 @@
-threads_dep = dependency('threads')
+if is_windows
+  # avoid the unused libwinpthread-1.dll dependency on Windows; MPD
+  # doesn't use the pthread API on Windows, but this is what Meson
+  # unhelpfully detects for us
+  threads_dep = []
+else
+  threads_dep = dependency('threads')
+endif
 
 conf.set('HAVE_PTHREAD_SETNAME_NP', compiler.has_function('pthread_setname_np', dependencies: threads_dep))
 

src/zeroconf/ZeroconfBonjour.cxx

@@ -50,7 +50,7 @@ protected:
 	/* virtual methods from class SocketMonitor */
 	bool OnSocketReady(gcc_unused unsigned flags) noexcept override {
 		DNSServiceProcessResult(service_ref);
-		return false;
+		return true;
 	}
 };
 

systemd/system/mpd.socket

@@ -1,5 +1,5 @@
 [Socket]
-ListenStream=/run/mpd/socket
+ListenStream=%t/mpd/socket
 ListenStream=6600
 Backlog=5
 KeepAlive=true

systemd/user/meson.build

@@ -3,6 +3,12 @@ if systemd_user_unit_dir == ''
   systemd_user_unit_dir = join_paths(get_option('prefix'), 'lib', 'systemd', 'user')
 endif
 
+# copy the system socket unit to the "user" directory
+install_data(
+  join_paths('..', 'system', 'mpd.socket'),
+  install_dir: systemd_user_unit_dir,
+)
+
 configure_file(
   input: 'mpd.service.in',
   output: 'mpd.service',

test/MakeTag.hxx

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2003-2019 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 "tag/Builder.hxx"
+#include "tag/Tag.hxx"
+#include "util/Compiler.h"
+
+inline void
+BuildTag(gcc_unused TagBuilder &tag) noexcept
+{
+}
+
+template<typename... Args>
+inline void
+BuildTag(TagBuilder &tag, TagType type, const char *value,
+	 Args&&... args) noexcept
+{
+	tag.AddItem(type, value);
+	BuildTag(tag, std::forward<Args>(args)...);
+}
+
+template<typename... Args>
+inline Tag
+MakeTag(Args&&... args) noexcept
+{
+	TagBuilder tag;
+	BuildTag(tag, std::forward<Args>(args)...);
+	return tag.Commit();
+}

test/RunChromaprint.cxx

@@ -165,8 +165,8 @@ public:
 		return GetCommand();
 	}
 
-	void SubmitReplayGain(const ReplayGainInfo *) {}
-	void SubmitMixRamp(MixRampInfo &&) {}
+	void SubmitReplayGain(const ReplayGainInfo *) override {}
+	void SubmitMixRamp(MixRampInfo &&) override {}
 };
 
 void

test/TestTagSongFilter.cxx

@@ -0,0 +1,163 @@
+/*
+ * Copyright 2003-2019 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 "MakeTag.hxx"
+#include "song/TagSongFilter.hxx"
+#include "song/LightSong.hxx"
+#include "tag/Type.h"
+
+#include <gtest/gtest.h>
+
+static bool
+InvokeFilter(const TagSongFilter &f, const Tag &tag) noexcept
+{
+	return f.Match(LightSong("dummy", tag));
+}
+
+TEST(TagSongFilter, Basic)
+{
+	const TagSongFilter f(TAG_TITLE,
+			      StringFilter("needle", false, false, false));
+
+	EXPECT_TRUE(InvokeFilter(f, MakeTag(TAG_TITLE, "needle")));
+	EXPECT_TRUE(InvokeFilter(f, MakeTag(TAG_TITLE, "foo", TAG_TITLE, "needle")));
+	EXPECT_TRUE(InvokeFilter(f, MakeTag(TAG_TITLE, "needle", TAG_TITLE, "foo")));
+	EXPECT_TRUE(InvokeFilter(f, MakeTag(TAG_ARTIST, "foo", TAG_TITLE, "needle", TAG_ALBUM, "bar")));
+
+	EXPECT_FALSE(InvokeFilter(f, MakeTag()));
+	EXPECT_FALSE(InvokeFilter(f, MakeTag(TAG_TITLE, "foo")));
+	EXPECT_FALSE(InvokeFilter(f, MakeTag(TAG_TITLE, "foo", TAG_TITLE, "bar")));
+	EXPECT_FALSE(InvokeFilter(f, MakeTag(TAG_TITLE, "foo", TAG_ARTIST, "needle")));
+	EXPECT_FALSE(InvokeFilter(f, MakeTag(TAG_TITLE, "FOOneedleBAR")));
+}
+
+/**
+ * Test with empty string.  This matches tags where the given tag type
+ * does not exist.
+ */
+TEST(TagSongFilter, Empty)
+{
+	const TagSongFilter f(TAG_TITLE,
+			      StringFilter("", false, false, false));
+
+	EXPECT_TRUE(InvokeFilter(f, MakeTag()));
+
+	EXPECT_FALSE(InvokeFilter(f, MakeTag(TAG_TITLE, "foo")));
+	EXPECT_FALSE(InvokeFilter(f, MakeTag(TAG_TITLE, "foo", TAG_TITLE, "bar")));
+}
+
+TEST(TagSongFilter, Substring)
+{
+	const TagSongFilter f(TAG_TITLE,
+			      StringFilter("needle", false, true, false));
+
+	EXPECT_TRUE(InvokeFilter(f, MakeTag(TAG_TITLE, "needle")));
+	EXPECT_TRUE(InvokeFilter(f, MakeTag(TAG_TITLE, "needleBAR")));
+	EXPECT_TRUE(InvokeFilter(f, MakeTag(TAG_TITLE, "FOOneedle")));
+	EXPECT_TRUE(InvokeFilter(f, MakeTag(TAG_TITLE, "FOOneedleBAR")));
+
+	EXPECT_FALSE(InvokeFilter(f, MakeTag()));
+	EXPECT_FALSE(InvokeFilter(f, MakeTag(TAG_TITLE, "eedle")));
+}
+
+TEST(TagSongFilter, Negated)
+{
+	const TagSongFilter f(TAG_TITLE,
+			      StringFilter("needle", false, false, true));
+
+	EXPECT_TRUE(InvokeFilter(f, MakeTag()));
+	EXPECT_FALSE(InvokeFilter(f, MakeTag(TAG_TITLE, "needle")));
+	EXPECT_TRUE(InvokeFilter(f, MakeTag(TAG_TITLE, "foo")));
+}
+
+/**
+ * Combine the "Empty" and "Negated" tests.
+ */
+TEST(TagSongFilter, EmptyNegated)
+{
+	const TagSongFilter f(TAG_TITLE,
+			      StringFilter("", false, false, true));
+
+	EXPECT_FALSE(InvokeFilter(f, MakeTag()));
+	EXPECT_TRUE(InvokeFilter(f, MakeTag(TAG_TITLE, "foo")));
+}
+
+/**
+ * Negation with multiple tag values.
+ */
+TEST(TagSongFilter, MultiNegated)
+{
+	const TagSongFilter f(TAG_TITLE,
+			      StringFilter("needle", false, false, true));
+
+	EXPECT_TRUE(InvokeFilter(f, MakeTag(TAG_TITLE, "foo", TAG_TITLE, "bar")));
+	EXPECT_FALSE(InvokeFilter(f, MakeTag(TAG_TITLE, "needle", TAG_TITLE, "bar")));
+	EXPECT_FALSE(InvokeFilter(f, MakeTag(TAG_TITLE, "foo", TAG_TITLE, "needle")));
+}
+
+/**
+ * Check whether fallback tags work, e.g. AlbumArtist falls back to
+ * just Artist if there is no AlbumArtist.
+ */
+TEST(TagSongFilter, Fallback)
+{
+	const TagSongFilter f(TAG_ALBUM_ARTIST,
+			      StringFilter("needle", false, false, false));
+
+	EXPECT_TRUE(InvokeFilter(f, MakeTag(TAG_ALBUM_ARTIST, "needle")));
+	EXPECT_TRUE(InvokeFilter(f, MakeTag(TAG_ARTIST, "needle")));
+
+	EXPECT_FALSE(InvokeFilter(f, MakeTag()));
+	EXPECT_FALSE(InvokeFilter(f, MakeTag(TAG_ALBUM_ARTIST, "foo")));
+	EXPECT_FALSE(InvokeFilter(f, MakeTag(TAG_ARTIST, "foo")));
+
+	/* no fallback, thus the Artist tag isn't used and this must
+	   be a mismatch */
+	EXPECT_FALSE(InvokeFilter(f, MakeTag(TAG_ARTIST, "needle", TAG_ALBUM_ARTIST, "foo")));
+}
+
+/**
+ * Combine the "Empty" and "Fallback" tests.
+ */
+TEST(TagSongFilter, EmptyFallback)
+{
+	const TagSongFilter f(TAG_ALBUM_ARTIST,
+			      StringFilter("", false, false, false));
+
+	EXPECT_TRUE(InvokeFilter(f, MakeTag()));
+
+	EXPECT_FALSE(InvokeFilter(f, MakeTag(TAG_ALBUM_ARTIST, "foo")));
+	EXPECT_FALSE(InvokeFilter(f, MakeTag(TAG_ARTIST, "foo")));
+}
+
+/**
+ * Combine the "Negated" and "Fallback" tests.
+ */
+TEST(TagSongFilter, NegatedFallback)
+{
+	const TagSongFilter f(TAG_ALBUM_ARTIST,
+			      StringFilter("needle", false, false, true));
+
+	EXPECT_TRUE(InvokeFilter(f, MakeTag()));
+	EXPECT_TRUE(InvokeFilter(f, MakeTag(TAG_ALBUM_ARTIST, "foo")));
+	EXPECT_FALSE(InvokeFilter(f, MakeTag(TAG_ALBUM_ARTIST, "needle")));
+	EXPECT_TRUE(InvokeFilter(f, MakeTag(TAG_ARTIST, "foo")));
+	EXPECT_FALSE(InvokeFilter(f, MakeTag(TAG_ARTIST, "needle")));
+	EXPECT_TRUE(InvokeFilter(f, MakeTag(TAG_ARTIST, "needle", TAG_ALBUM_ARTIST, "foo")));
+}

test/meson.build

@@ -20,16 +20,6 @@ gtest_dep = declare_dependency(
 
 subdir('net')
 
-executable(
-  'ParseSongFilter',
-  'ParseSongFilter.cxx',
-  include_directories: inc,
-  dependencies: [
-    song_dep,
-    pcm_dep,
-  ],
-)
-
 executable(
   'read_conf',
   'read_conf.cxx',
@@ -211,6 +201,33 @@ if zlib_dep.found()
   )
 endif
 
+#
+# Filter
+#
+
+executable(
+  'ParseSongFilter',
+  'ParseSongFilter.cxx',
+  include_directories: inc,
+  dependencies: [
+    song_dep,
+    pcm_dep,
+  ],
+)
+
+test(
+  'TestSongFilter',
+  executable(
+    'TestSongFilter',
+    'TestTagSongFilter.cxx',
+    include_directories: inc,
+    dependencies: [
+      song_dep,
+      gtest_dep,
+    ],
+  )
+)
+
 #
 # Neighbor
 #

test/test_translate_song.cxx

@@ -2,6 +2,7 @@
  * Unit tests for playlist_check_translate_song().
  */
 
+#include "MakeTag.hxx"
 #include "playlist/PlaylistSong.hxx"
 #include "song/DetachedSong.hxx"
 #include "SongLoader.hxx"
@@ -38,28 +39,6 @@ uri_supported_scheme(const char *uri) noexcept
 static constexpr auto music_directory = PATH_LITERAL("/music");
 static Storage *storage;
 
-static void
-BuildTag(gcc_unused TagBuilder &tag)
-{
-}
-
-template<typename... Args>
-static void
-BuildTag(TagBuilder &tag, TagType type, const char *value, Args&&... args)
-{
-	tag.AddItem(type, value);
-	BuildTag(tag, std::forward<Args>(args)...);
-}
-
-template<typename... Args>
-static Tag
-MakeTag(Args&&... args)
-{
-	TagBuilder tag;
-	BuildTag(tag, std::forward<Args>(args)...);
-	return tag.Commit();
-}
-
 static Tag
 MakeTag1a()
 {

win32/res/meson.build

@@ -1,7 +1,7 @@
 windows_conf = configuration_data()
 windows_conf.set('VERSION', meson.project_version())
 
-splitted_version = meson.project_version().split('.')
+splitted_version = meson.project_version().split('~')[0].split('.')
 windows_conf.set('VERSION_MAJOR', splitted_version[0])
 windows_conf.set('VERSION_MINOR', splitted_version.get(1, '0'))
 windows_conf.set('VERSION_REVISION', splitted_version.get(2, '0'))