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* notify the decoder instead of polling 100hzMax Kellermann2008-03-261-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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
* Cleanup checking for tests in src/ when building in separate dirEric Wong2008-01-261-1/+2
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@7147 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* ioops: make this zero-impact when compiling w/o zeroconf as wellEric Wong2008-01-031-0/+1
| | | | | | | This reduces the text size of the binary slightly when zeroconf support is not built, and keeps the interface code cleaner as well. git-svn-id: https://svn.musicpd.org/mpd/trunk@7133 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* Merge branches/ew r7104Eric Wong2007-12-281-0/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | thread-safety work in preparation for rewrite to use pthreads Expect no regressions against trunk (r7078), possibly minor performance improvements in update (due to fewer heap allocations), but increased stack usage. Applied the following patches: * maxpath_str for reentrancy (temporary fix, reverted) * path: start working on thread-safe variants of these methods * Re-entrancy work on path/character-set conversions * directory.c: exploreDirectory() use reentrant functions here * directory/update: more use of reentrant functions + cleanups * string_toupper: a strdup-less version of strDupToUpper * get_song_url: a static-variable-free version of getSongUrl() * Use reentrant/thread-safe get_song_url everywhere * replace rmp2amp with the reentrant version, rmp2amp_r * Get rid of the non-reentrant/non-thread-safe rpp2app, too. * buffer2array: assert strdup() returns a usable value in unit tests * replace utf8ToFsCharset and fsCharsetToUtf8 with thread-safe variants * fix storing playlists w/o absolute paths * parent_path(), a reentrant version of parentPath() * parentPath => parent_path for reentrancy and thread-safety * allow "make test" to automatically run embedded unit tests * remove convStrDup() and maxpath_str() * use MPD_PATH_MAX everywhere instead of MAXPATHLEN * path: get rid of appendSlash, pfx_path and just use pfx_dir * get_song_url: fix the ability to play songs in the top-level music_directory git-svn-id: https://svn.musicpd.org/mpd/trunk@7106 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* Adding WavPack support. Patch courtesy Kodest.J. Alexander Treuman2007-06-241-1/+2
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@6651 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* Adding FIFO audio output. This is pretty much identical to the old one,J. Alexander Treuman2007-06-131-1/+2
| | | | | except that it now uses a timer for throttling. git-svn-id: https://svn.musicpd.org/mpd/trunk@6621 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* Move the timing code from the null plugin to timer.c, so it can be easilyJ. Alexander Treuman2007-05-301-2/+4
| | | | | used in other plugins (fifo, shout, etc.). git-svn-id: https://svn.musicpd.org/mpd/trunk@6397 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* Adding a null output plugin.J. Alexander Treuman2007-05-301-0/+1
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@6393 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* Adding ioops.h to mpd_headers so that it gets included in the tarball.J. Alexander Treuman2007-05-281-0/+1
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@6323 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* Committing pat's rewrite of the stored playlist code. This also adds twoJ. Alexander Treuman2007-05-161-2/+4
| | | | | new commands: playlistmove and playlistdelete. git-svn-id: https://svn.musicpd.org/mpd/trunk@6116 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* Moving a bunch of the LocateTagItem code to locate.[ch] so that it canJ. Alexander Treuman2007-02-241-2/+4
| | | | | later be used for playlist searching. git-svn-id: https://svn.musicpd.org/mpd/trunk@5419 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* Reverting all of my localization changes. It was a horribleJ. Alexander Treuman2007-02-181-2/+0
| | | | | | implementation, and fixing it is a big enough job that I don't know when I'll get around to it. Probably best just starting from scratch anyhow. git-svn-id: https://svn.musicpd.org/mpd/trunk@5373 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* Added zeroconf service publishing using avahiJim Ramsay2007-01-111-2/+4
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@5238 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* Moving localization stuff from path.c to localization.c so we can reuse itJ. Alexander Treuman2007-01-081-2/+4
| | | | | for log messages when outputting to console. git-svn-id: https://svn.musicpd.org/mpd/trunk@5225 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* jack patch from anarch (and some type fixes for mp4 and acc plugins)Warren Dukes2006-10-181-1/+2
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@4912 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* merge changes from mpd-tree:Warren Dukes2006-08-061-0/+2
| | | | | | -use tree for tagTracker -eliminate the master process git-svn-id: https://svn.musicpd.org/mpd/trunk@4571 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* Standardize state_file handling routines.Eric Wong2006-07-301-0/+2
| | | | | This way it's easier to manage and extend. git-svn-id: https://svn.musicpd.org/mpd/trunk@4494 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* interface/connection malloc reductions from mpd-keEric Wong2006-07-301-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | This patch massively reduces the amount of heap allocations at the interface/command layer. Most commands with minimal output should not allocate memory from the heap at all. Things like repeatedly polling status, currentsong, and volume changes should be faster as a result, and more importantly, not a source of memory fragmentation. These changes should be safe in that there's no way for a remote-client to corrupt memory or otherwise do bad stuff to MPD, but an extra set of eyes to review would be good. Of course there's never any warranty :) No longer do we use FILE * structures in the interface, which means we don't have to allocate any new memory for most connections. Now, before you go on about losing the buffering that FILE * +implies+, remember that myfprintf() never took advantage of any of the stdio buffering features. To reduce the diff and make bugs easier to spot in the diff, I've kept myfprintf in places where we write to files (and not network interfaces). Expect myfprintf to go away entirely soon (we'll use fprintf for writing regular files). git-svn-id: https://svn.musicpd.org/mpd/trunk@4483 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* Use AudioCompress for volume normalizationJ. Alexander Treuman2006-07-271-0/+2
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@4474 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* Remove the fifo plugin. It's currently useless for the average user, and ↵J. Alexander Treuman2006-07-261-1/+0
| | | | | making it more presentable isn't something I'm willing to do before 0.12. It will likely be added back after 0.12, along with some very experimental stuff to make it more usable. git-svn-id: https://svn.musicpd.org/mpd/trunk@4472 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* Put mp4ff back into the treeAvuton Olrich2006-07-261-1/+4
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@4461 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* Cleanup some now unnecessary variables from the id3/mad removalEric Wong2006-07-221-1/+1
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@4431 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* Adding on the fly volume normalization support. Code originally from ↵J. Alexander Treuman2006-07-221-0/+2
| | | | | 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
* Adding fifo output pluginJ. Alexander Treuman2006-07-221-0/+1
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@4423 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* Remove the internal mp4ff dependencyAvuton Olrich2006-07-191-4/+1
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@4401 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* add sparse-check target to makefilesEric Wong2006-07-171-0/+11
| | | | | | | | | sparse is a semantic parser developed for the Linux kernel, but works for any project written (ANSI) C. You can get sparse via git here: git clone git://www.kernel.org/pub/scm/devel/sparse/sparse.git git-svn-id: https://svn.musicpd.org/mpd/trunk@4377 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* Remove hosted libid3tag & libmadAvuton Olrich2006-07-161-2/+2
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@4369 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* Add PulseAudio supportJ. Alexander Treuman2006-07-131-0/+1
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@4316 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* merge with mpd/trunk up to r3925Eric Wong2006-03-161-2/+7
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@3926 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* patch from Oliver Logghe for Hauppage Media MVP supportWarren Dukes2005-08-111-0/+1
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@3432 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* add OS X configure stuff and added a skeleton audioOutput plugin for OS XWarren Dukes2005-03-131-0/+1
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@3074 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* implemented alsa audioOutput plugin, now it needs testingWarren Dukes2005-03-051-0/+1
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@3008 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* will compile if you manually add "HAVE_MUSEPACK" to config.h and -lmusepack toWarren Dukes2005-02-011-0/+1
| | | | | MPD_LIBS in Makefile git-svn-id: https://svn.musicpd.org/mpd/trunk@2919 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* merge changes from metadata-rewrite branchWarren Dukes2004-11-101-2/+4
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@2589 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* move audioOutput dir to audioOutputsWarren Dukes2004-11-021-5/+5
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@2471 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* move audioOutput plugins to audioOutput directoryWarren Dukes2004-11-021-3/+6
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@2470 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* finish integrating in np's oss stuffWarren Dukes2004-10-301-0/+1
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@2413 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* stub audioOutput plugin for shoutWarren Dukes2004-10-201-0/+1
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@2283 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* some work on the new audioOutput layerWarren Dukes2004-10-201-0/+3
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@2277 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* tidy up Makefile a bitWarren Dukes2004-07-041-21/+90
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@1791 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* add ack.h to mpd_headersWarren Dukes2004-06-071-2/+2
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@1363 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* mechanism for updating metadata while decodingWarren Dukes2004-06-061-2/+2
| | | | | | | 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
* mod_plugin, just for tarzeauWarren Dukes2004-05-311-1/+2
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@1263 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* aac_pluginWarren Dukes2004-05-311-3/+3
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@1250 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* mp4_pluginWarren Dukes2004-05-311-3/+4
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@1249 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* audiofile_pluginWarren Dukes2004-05-311-3/+3
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@1248 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* flac_pluginWarren Dukes2004-05-311-3/+4
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@1246 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* mp3 and ogg plugin stuffWarren Dukes2004-05-311-5/+8
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@1245 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* finish implementing inputPlugin interfaceWarren Dukes2004-05-301-2/+4
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@1244 09075e82-0dd4-0310-85a5-a0d7c8717e4f
* add new inputStream stuff, hopefully something major isn't foobar'dWarren Dukes2004-05-181-2/+2
| | | git-svn-id: https://svn.musicpd.org/mpd/trunk@1049 09075e82-0dd4-0310-85a5-a0d7c8717e4f
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