Commit Graph

58 Commits

Author SHA1 Message Date
Max Kellermann
e626028b41 moved check to outputBufferAbsolute()
decoderParent() uses a lot of OutputBuffer internals to see whether
cross-fading should be started.  Move these checks to outputBuffer.c,
which also simplifies decoderParent().

git-svn-id: https://svn.musicpd.org/mpd/trunk@7262 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2008-04-12 04:12:42 +00:00
Max Kellermann
a7b19012d3 add method availableOutputBuffer()
The method availableOutputBuffer() calculates how many chunks are in
use.  This simplifies code which needs this information, and it can
run without knowing OutputBuffer internals.  The function knows how to
calculate this when begin>end; this might have been a bug in
decodeParent(), which does not.

git-svn-id: https://svn.musicpd.org/mpd/trunk@7250 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2008-04-12 04:11:41 +00:00
Max Kellermann
1ecebd4686 moved code to function tailChunk()
This patch removes some clutter from decodeParent() by moving some
code out.

git-svn-id: https://svn.musicpd.org/mpd/trunk@7247 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2008-04-12 04:11:23 +00:00
Max Kellermann
63b55b9a48 use free()+malloc() instead of realloc()
realloc() has to copy data to the new buffer.  Since convBuffer
contains temporary data only, we can safely use free() plus a new
malloc(), which saves the mempy().

git-svn-id: https://svn.musicpd.org/mpd/trunk@7246 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2008-04-12 04:11:17 +00:00
Eric Wong
b323040489 outputBuffer: remove unused variable
[merged r7185 from branches/ew]

git-svn-id: https://svn.musicpd.org/mpd/trunk@7243 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2008-04-12 04:08:22 +00:00
Eric Wong
45ebb851f4 Drop metadata updates from HTTP for now (input HTTP, and shout)
It is way more complicated than it should be; and
locking it for thread-safety is too difficult.

[merged r7183 from branches/ew]

git-svn-id: https://svn.musicpd.org/mpd/trunk@7241 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2008-04-12 04:08:12 +00:00
Eric Wong
9cf66d0e8a Initial cut of fork() => pthreads() for decoder and player
I initially started to do a heavy rewrite that changed the way processes
communicated, but that was too much to do at once.  So this change only
focuses on replacing the player and decode processes with threads and
using condition variables instead of polling in loops; so the changeset
itself is quiet small.

* The shared output buffer variables will still need locking
to guard against race conditions.  So in this effect, we're probably
just as buggy as before.  The reduced context-switching overhead of
using threads instead of processes may even make bugs show up more or
less often...

* Basic functionality appears to be working for playing local (and NFS)
audio, including:
play, pause, stop, seek, previous, next, and main playlist editing

* I haven't tested HTTP streams yet, they should work.

* I've only tested ALSA and Icecast.  ALSA works fine, Icecast
metadata seems to get screwy at times and breaks song
advancement in the playlist at times.

* state file loading works, too (after some last-minute hacks with
non-blocking wakeup functions)

* The non-blocking (*_nb) variants of the task management functions are
probably overused.  They're more lenient and easier to use because
much of our code is still based on our previous polling-based system.

* It currently segfaults on exit.  I haven't paid much attention
to the exit/signal-handling routines other than ensuring it
compiles.  At least the state file seems to work.  We don't
do any cleanups of the threads on exit, yet.

* Update is still done in a child process and not in a thread.
To do this in a thread, we'll need to ensure it does proper
locking and communication with the main thread; but should
require less memory in the end because we'll be updating
the database "in-place" rather than updating a copy and
then bulk-loading when done.

* We're more sensitive to bugs in 3rd party libraries now.
My plan is to eventually use a master process which forks()
and restarts the child when it dies:
locking and communication with the main thread; but should
require less memory in the end because we'll be updating
the database "in-place" rather than updating a copy and
then bulk-loading when done.

* We're more sensitive to bugs in 3rd party libraries now.
My plan is to eventually use a master process which forks()
and restarts the child when it dies:

master - just does waitpid() + fork() in a loop
\- main thread
\- decoder thread
\- player thread

At the beginning of every song, the main thread will set
a dirty flag and update the state file.  This way, if we
encounter a song that triggers a segfault killing the
main thread, the master will start the replacement main
on the next song.

* The main thread still wakes up every second on select()
to check for signals; which affects power management.

[merged r7138 from branches/ew]

git-svn-id: https://svn.musicpd.org/mpd/trunk@7240 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2008-04-12 04:08:00 +00:00
Max Kellermann
c069b89d86 use unsigned integers in outputBuffer.c
The chunk index cannot be negative.

git-svn-id: https://svn.musicpd.org/mpd/trunk@7231 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2008-04-12 04:06:57 +00:00
Max Kellermann
b60789dd8c fix sign compare warnings
Do explicit casts before comparing signed with unsigned.  The one in
log.c actually fixes another warning: in the expanded macro, there may
be a check "logLevel>=0", which is always true.

git-svn-id: https://svn.musicpd.org/mpd/trunk@7230 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2008-04-12 04:06:52 +00:00
Max Kellermann
bf05ce161f notify the decoder instead of polling 100hz
When the decoder process is faster than the player process, all
decodedd buffers are full at some point in time.  The decoder has to
wait for buffers to become free (finished playing).  It used to do
this by polling the buffer status 100 times a second.

This generates a lot of unnecessary CPU wakeups.  This patch adds a
way for the player process to notify the decoder process that it may
continue its work.

We could use pthread_cond for that, unfortunately inter-process
mutexes/conds are not supported by some kernels (Linux), so we cannot
use this light-weight method until mpd moves to using threads instead
of processes.  The other method would be semaphores, which
historically are global resources with a unique name; this historic
API is cumbersome, and I wanted to avoid it.

I came up with a quite naive solution for now: I create an anonymous
pipe with pipe(), and the decoder process reads on that pipe.  Until
the player process sends data on it as a signal, the decoder process
blocks.

This can be optimized in a number of ways:

- if the decoder process is still working (instead of waiting for
buffers), we could save the write() system call, since there is
nobody waiting for the notification.
[ew: I tried this using a counter in shared memory, didn't help]

- the pipe buffer will be full at some point, when the decoder thread
is too slow.  For this reason, the writer side of the pipe is
non-blocking, and mpd can ignore the resulting EWOULDBLOCK.

- since we have shared memory, we could check whether somebody is
actually waiting without a context switch, and we could just not
write the notification byte.
[ew: tried same method/result as first point above]

- if there is already a notification in the pipe, we could also not
write another one.
[ew: tried same method/result as first/third points above]

- the decoder will only consume 64 bytes at a time.  If the pipe
buffer is full, this will result in a lot of read() invocations.
This does not hurt badly, but on a heavily loaded system, this might
add a little bit more load.  The preceding optimizations however
are able eliminate the this.

- finally, we should use another method for inter process
notifications - maybe kill() or just make mpd use threads, finally.

In spite of all these possibilities to optimize this code further,
this pipe notification trick is faster than the 100 Hz poll.  On my
machine, it reduced the number of wakeups to less than 30%.

git-svn-id: https://svn.musicpd.org/mpd/trunk@7215 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2008-03-26 10:38:54 +00:00
Max Kellermann
1910df96a3 moved code to initOutputBuffer()
This patch moves code which initializes the OutputBuffer struct to
outputBuffer.c.  Although this is generally a good idea, it prepares
the following patch.

git-svn-id: https://svn.musicpd.org/mpd/trunk@7206 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2008-03-26 10:38:12 +00:00
Max Kellermann
27f12c173d use size_t
When dealing with in-memory lengths, the standard type "size_t" should
be used.  Missing one can be quite dangerous, because an attacker
could provoke an integer under-/overflow, which may provide an attack
vector.

git-svn-id: https://svn.musicpd.org/mpd/trunk@7205 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2008-03-26 10:38:07 +00:00
Max Kellermann
07adb14e3c fixed -Wshadow warnings
Signed-off-by: Eric Wong <normalperson@yhbt.net>

git-svn-id: https://svn.musicpd.org/mpd/trunk@7143 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2008-01-26 12:46:21 +00:00
Eric Wong
cb8f1af3bd Cleanup #includes of standard system headers and put them in one place
This will make refactoring features easier, especially now that
pthreads support and larger refactorings are on the horizon.

Hopefully, this will make porting to other platforms (even
non-UNIX-like ones for masochists) easier, too.

os_compat.h will house all the #includes for system headers
considered to be the "core" of MPD.  Headers for optional
features will be left to individual source files.

git-svn-id: https://svn.musicpd.org/mpd/trunk@7130 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2008-01-03 07:29:49 +00:00
J. Alexander Treuman
355d18a593 Make pcm_convertAudioFormat return the buffer size. This is necessary
because lsr may return less than the input buffer size, and the rest of the
audio code needs to know the new size.  This fixes the clicking that was
introduced with recent changes to the lsr code.  A huge thanks to remiss
for figuring this out.

git-svn-id: https://svn.musicpd.org/mpd/trunk@6273 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2007-05-26 16:39:55 +00:00
J. Alexander Treuman
2814b7cfc6 Reverting to the full lsr API. Turns out the simple API needs all of the
audio at once, so it won't work for us.  The old full API code was still
heavily broken, as each call to pcm_convertSampleRate() used the same
state, even if it was processing two streams of audio.  The new code keeps
a separate state for each audio stream that's being converted.

git-svn-id: https://svn.musicpd.org/mpd/trunk@6255 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2007-05-24 21:15:37 +00:00
J. Alexander Treuman
407497c40a Split pcm_convertAudioFormat into separate functions for bitrate, channel,
and samplerate conversion.  This makes the code much easier to read, and
fixes a few bugs that were previously there.

git-svn-id: https://svn.musicpd.org/mpd/trunk@6224 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2007-05-22 23:11:36 +00:00
Avuton Olrich
a061da8fb5 The massive copyright update
git-svn-id: https://svn.musicpd.org/mpd/trunk@5834 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2007-04-05 03:22:33 +00:00
Warren Dukes
b54c7c64c0 #1) fix a few potential deadlock conditons in decode.c when crossfading is enabled
#2) fix a deadlock condition when attempting to seek if the decoder quit and returned to playerInit()

git-svn-id: https://svn.musicpd.org/mpd/trunk@5325 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2007-02-11 20:36:26 +00:00
Eric Wong
b443363aa6 Don't initialize globals to zero (or NULL)
Some compilers and linkers aren't smart enough to optimize this,
as global variables are implictly initialized to zero.  As a
result, binaries are a bit smaller as more goes in the .bss and
less in the text section.

git-svn-id: https://svn.musicpd.org/mpd/trunk@5254 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2007-01-14 03:07:53 +00:00
Eric Wong
5ece12982a outputBuffer: avoid out-of-bounds-error in clearOutputBuffer()
I'm still not entirely certain why we index cb->metaChunkSet[]
with currentChunk (and not currentMetaChunk), but shank told me
that currentChunk is correct...

git-svn-id: https://svn.musicpd.org/mpd/trunk@4814 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2006-09-21 08:27:24 +00:00
Eric Wong
90847fc881 Replace strdup and {c,re,m}alloc with x* variants to check for OOM errors
I'm checking for zero-size allocations and assert()-ing them,
so we can more easily get backtraces and debug problems, but we'll
also allow -DNDEBUG people to live on the edge if they wish.

We do not rely on errno when checking for OOM errors because
some implementations of malloc do not set it, and malloc
is commonly overridden by userspace wrappers.

I've spent some time looking through the source and didn't find any
obvious places where we would explicitly allocate 0 bytes, so we
shouldn't trip any of those assertions.

We also avoid allocating zero bytes because C libraries don't
handle this consistently (some return NULL, some not); and it's
dangerous either way.

git-svn-id: https://svn.musicpd.org/mpd/trunk@4690 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2006-08-26 06:25:57 +00:00
J. Alexander Treuman
22b16884a2 Use AudioCompress for volume normalization
git-svn-id: https://svn.musicpd.org/mpd/trunk@4474 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2006-07-27 00:50:59 +00:00
J. Alexander Treuman
48240740e7 Do normalization if there's replaygain data but replaygain is off
git-svn-id: https://svn.musicpd.org/mpd/trunk@4445 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2006-07-24 16:32:50 +00:00
J. Alexander Treuman
cf90f8194f Adding on the fly volume normalization support. Code originally from mplayer, ported by syscrash, cleaned up by avuton, and further cleaned up by me (jat).
git-svn-id: https://svn.musicpd.org/mpd/trunk@4424 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2006-07-22 00:53:37 +00:00
Avuton Olrich
29a25b9933 Add mpd-indent.sh
Indent the entire tree, hopefully we can keep
it indented.

git-svn-id: https://svn.musicpd.org/mpd/trunk@4410 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2006-07-20 16:02:40 +00:00
Avuton Olrich
a150663e71 Remove useless buffer signedness warnings, use
void * rather than "x char *"

git-svn-id: https://svn.musicpd.org/mpd/trunk@4408 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2006-07-19 19:41:59 +00:00
J. Alexander Treuman
2fa7125cce Change shank's email address
git-svn-id: https://svn.musicpd.org/mpd/trunk@4333 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2006-07-14 19:37:45 +00:00
Avuton Olrich
a37348a74f Huge header update, update the copyright and add
the GPL header where necessary

git-svn-id: https://svn.musicpd.org/mpd/trunk@4317 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2006-07-13 19:20:34 +00:00
Eric Wong
c208b05a0e Don't rely on memcmp() for structs, padding bits are random
git-svn-id: https://svn.musicpd.org/mpd/trunk@4016 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2006-04-05 09:54:43 +00:00
Eric Wong
db34f66d1a src/outputBuffer.c: bugfix: freeMpdTag(), not just free()
git-svn-id: https://svn.musicpd.org/mpd/trunk@3930 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2006-03-19 00:06:47 +00:00
Warren Dukes
9297ae7fce print out bits in debug message output for OSS and ALSA
git-svn-id: https://svn.musicpd.org/mpd/trunk@3104 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2005-03-19 14:30:07 +00:00
Warren Dukes
54679d9028 rewrite replaygain code, needs testing
git-svn-id: https://svn.musicpd.org/mpd/trunk@2482 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2004-11-02 19:56:59 +00:00
Warren Dukes
12597322a2 configure shout encoding quality and audio format
git-svn-id: https://svn.musicpd.org/mpd/trunk@2307 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2004-10-23 01:04:58 +00:00
Warren Dukes
dc4aeafee0 very minor tweak to clearMetabufferChunks
git-svn-id: https://svn.musicpd.org/mpd/trunk@1650 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2004-06-24 16:25:06 +00:00
Warren Dukes
0228a4a5ca uber minor tweaks
git-svn-id: https://svn.musicpd.org/mpd/trunk@1563 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2004-06-19 16:27:48 +00:00
Warren Dukes
bfaf6cbd9d fix some streaming metadata issues
git-svn-id: https://svn.musicpd.org/mpd/trunk@1416 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2004-06-09 16:58:33 +00:00
Warren Dukes
6f4a55ea7c remove "wrap" from buffering control, its not needed, and could potentially
create a race condition (but hasn't happened in the last 10 months since
this code was written)

git-svn-id: https://svn.musicpd.org/mpd/trunk@1397 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2004-06-08 18:55:16 +00:00
Warren Dukes
1760433061 remove metadata debugging code
git-svn-id: https://svn.musicpd.org/mpd/trunk@1378 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2004-06-07 20:47:00 +00:00
Warren Dukes
608a15a885 bug fix for metadata again, had an extra "!" in mpdTagsAreEqual()
git-svn-id: https://svn.musicpd.org/mpd/trunk@1371 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2004-06-07 15:00:18 +00:00
Warren Dukes
333c0a6fdd some fixes to metadata stuff
git-svn-id: https://svn.musicpd.org/mpd/trunk@1370 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2004-06-07 14:16:10 +00:00
Warren Dukes
ae44b7dae5 potential bugfixes for handling metadata in player/decoder
git-svn-id: https://svn.musicpd.org/mpd/trunk@1369 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2004-06-07 12:11:57 +00:00
Warren Dukes
62f32ccb01 harden metadatabuffer
git-svn-id: https://svn.musicpd.org/mpd/trunk@1362 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2004-06-06 22:13:23 +00:00
Warren Dukes
33f21b9374 spelling fix for avuton
git-svn-id: https://svn.musicpd.org/mpd/trunk@1361 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2004-06-06 21:37:12 +00:00
Warren Dukes
b29f73c819 mechanism for updating metadata while decoding
vorbis comments are updated on the fly for streams
need to decode icy metadata
buffering of metadata needs to be hardened, to ensure that player has already read a particular metachunk or passed over it

git-svn-id: https://svn.musicpd.org/mpd/trunk@1358 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2004-06-06 19:41:03 +00:00
Warren Dukes
4e53282469 todo update
git-svn-id: https://svn.musicpd.org/mpd/trunk@1352 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2004-06-06 16:42:14 +00:00
Warren Dukes
d80093fed6 fixed seek, its now blocking again
git-svn-id: https://svn.musicpd.org/mpd/trunk@1237 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2004-05-30 13:33:13 +00:00
Warren Dukes
42a1a76efe fix TIcho's seeking while paused bug
git-svn-id: https://svn.musicpd.org/mpd/trunk@1225 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2004-05-29 12:05:49 +00:00
Warren Dukes
71e7127585 undo last changes
git-svn-id: https://svn.musicpd.org/mpd/trunk@1217 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2004-05-28 02:27:36 +00:00
Warren Dukes
e93229bf49 fix seeking more than once when paused, by returning immediatly on dc->seek
in sendToOutputBuffer

git-svn-id: https://svn.musicpd.org/mpd/trunk@1216 09075e82-0dd4-0310-85a5-a0d7c8717e4f
2004-05-28 02:09:37 +00:00