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Wan-Teh Chang 343e283399 pthread_frame: use better memory orders for frame progress 
This improves commit 59c7022740.

In ff_thread_report_progress(), the fast code path can load
progress[field] with the relaxed memory order, and the slow code path
can store progress[field] with the release memory order. These changes
are mainly intended to avoid confusion when one inspects the source code.
They are unlikely to have measurable performance improvement.

ff_thread_report_progress() and ff_thread_await_progress() form a pair.
ff_thread_await_progress() reads progress[field] with the acquire memory
order (in the fast code path). Therefore, one expects to see
ff_thread_report_progress() write progress[field] with the matching
release memory order.

In the fast code path in ff_thread_report_progress(), the atomic load of
progress[field] doesn't need the acquire memory order because the
calling thread is trying to make the data it just decoded visible to the
other threads, rather than trying to read the data decoded by other
threads.

In ff_thread_get_buffer(), initialize progress[0] and progress[1] using
atomic_init().

Signed-off-by: Wan-Teh Chang <wtc@google.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
2016-12-14 11:16:51 +01:00
compat compat/atomics: add typecasts in atomic_compare_exchange_strong() 2016-12-08 15:53:58 -05:00
doc lavc: add a bitstream filter for splitting VP9 superframes 2016-12-14 09:06:45 +01:00
libavcodec pthread_frame: use better memory orders for frame progress 2016-12-14 11:16:51 +01:00
libavdevice build: Fix dependencies for alsa/jack/sndio support 2016-12-09 08:42:34 +01:00
libavfilter lavfi: Add VAAPI deinterlacer 2016-12-10 16:55:44 +00:00
libavformat avio: Keep track of the amount of data written 2016-12-08 15:58:28 -05:00
libavresample Fix some mismatches between function parameter and doxygen parameter names. 2016-11-21 14:29:10 +01:00
libavutil avutil: fix data race in av_get_cpu_flags() 2016-12-08 15:53:58 -05:00
libswscale swscale: Add GRAY12 2016-11-07 22:42:00 +01:00
presets
tests fate: Add h264 test for frame num gaps 2016-12-14 11:01:50 +01:00
tools build: Move entries related to building TOOLS to a subdirectory Makefile 2016-12-07 11:02:31 +01:00
.gitattributes
.gitignore build: Ignore generated mapfile and remove it on distclean 2016-05-27 11:27:24 +02:00
.travis.yml travis: Enable OSX integration 2015-11-17 16:51:00 +01:00
arch.mak
avconv_dxva2.c avconv_dxva2: add a profile check for hevc 2016-07-20 16:33:09 +02:00
avconv_filter.c avconv: make sure the filtergraph is freed on init failure 2016-10-02 11:41:45 +02:00
avconv_opt.c avconv_opt: Consistently iterate through hwaccels array in all cases 2016-11-13 19:06:38 +01:00
avconv_qsv.c avconv_qsv: use the actual pixel format provided by lavc 2016-07-22 19:08:12 +02:00
avconv_vaapi.c avconv_vaapi: Convert to use hw_frames_ctx only 2016-08-30 22:16:01 +01:00
avconv_vda.c
avconv_vdpau.c avconv_vdpau: use the hwcontext device creation API 2016-05-26 15:40:34 +02:00
avconv.c avconv: Fix the audio next dts computation 2016-11-29 10:38:01 +01:00
avconv.h avconv: support parsing bitstream filter options 2016-11-02 10:08:28 +01:00
avplay.c avplay: Correct function pointer assignments in options array 2016-11-08 17:20:30 +01:00
avprobe.c avprobe: Allow specifying multiple stream entries to be shown 2016-12-07 14:35:08 -05:00
Changelog mov: Export spherical information 2016-12-07 14:35:06 -05:00
cmdutils_common_opts.h
cmdutils.c avconv: switch to the new BSF API 2016-03-20 08:15:01 +01:00
cmdutils.h
common.mak build: Rename host_libs/HOSTLIBS variables to host_extralibs/HOSTEXTRALIBS 2016-12-09 18:51:23 +01:00
configure vp9: split superframes in the filtering stage before actual decoding 2016-12-14 09:06:45 +01:00
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS
INSTALL
library.mak build: Drop support for configuring library name suffixes 2016-12-03 09:15:01 +01:00
LICENSE Remove the legacy X11 screen grabber 2016-07-29 19:03:10 +02:00
Makefile build: Use _extralibs variable names instead of _libs everywhere 2016-12-09 18:57:03 +01:00
README
README.md
RELEASE Make the RELEASE file match with the most recent tag 2016-10-14 13:52:51 -04:00
version.sh build: remove hardcoded name of version header 2016-09-15 21:59:15 +02:00

README.md

Libav

Build Status

Libav is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.

Libraries

  • libavcodec provides implementation of a wider range of codecs.
  • libavformat implements streaming protocols, container formats and basic I/O access.
  • libavutil includes hashers, decompressors and miscellaneous utility functions.
  • libavfilter provides a mean to alter decoded Audio and Video through chain of filters.
  • libavdevice provides an abstraction to access capture and playback devices.
  • libavresample implements audio mixing and resampling routines.
  • libswscale implements color conversion and scaling routines.

Tools

  • avconv is a command line toolbox to manipulate, convert and stream multimedia content.
  • avplay is a minimalistic multimedia player.
  • avprobe is a simple analisys tool to inspect multimedia content.
  • Additional small tools such as aviocat, ismindex and qt-faststart.

Documentation

The offline documentation is available in the doc/ directory.

The online documentation is available in the main website and in the wiki.

Examples

Conding examples are available in the doc/example directory.

License

Libav codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.