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Andreas Rheinhardt f033e6d2e6 avcodec/rv34: Don't needlessly copy VLC length and symbol arrays 
Most of the VLCs used by RealVideo 3 and 4 obey three simple rules:
Shorter codes are on the left of the tree, for each length, the symbols
are ascending from left to right and the symbols either form a
permutation of 1..size or 0..(size - 1). For the latter case, one just
needs to store the length of each symbol and create the codes according
to the other rules; no explicit code or symbol array must be stored.
The former case is also treated in much the same way by artificially
assigning a length of zero to the symbol 0; when a length of zero was
encountered, the element was ignored except that the symbol counter was
still incremented. If the length was nonzero, the symbol would be
assigned via the symbol counter and the length copied over into a new
array.

Yet this is unnecessary, as ff_init_vlc_sparse() follows exactly the
same pattern: If a length of zero is encountered, the element is ignored
and only the symbol counter incremented. So one can directly forward the
length array and also need not create a symbol table oneself, because
ff_init_vlc_sparse() will infer the same symbol table in this case.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2020-10-26 07:16:10 +01:00
compat compat/cuda/ptx2c: remove shell loop; fix BSD sed compat 2020-06-01 22:10:41 -05:00
doc avformat/rtpproto: support for rtp read timeout 2020-10-22 20:53:56 +08:00
ffbuild ffbuild: Refine MIPS handling 2020-07-23 16:30:02 +02:00
fftools ffmpeg: deduplicate init_output_stream usage logic 2020-10-17 11:55:55 +03:00
libavcodec avcodec/rv34: Don't needlessly copy VLC length and symbol arrays 2020-10-26 07:16:10 +01:00
libavdevice avdevice/alldevices: stop using deprecated linked list API 2020-10-19 11:54:45 -03:00
libavfilter lavfi/Makefile: Remove opencl object files when calling make clean. 2020-10-25 21:18:34 +01:00
libavformat avformat: add alp muxer 2020-10-25 23:44:26 +10:00
libavresample avresample: remove deprecated attribute from the AVAudioResampleContext struct 2018-01-09 10:56:53 -03:00
libavutil avutil/mathematics: Use av_sat_add64() for the last addition in av_add_stable() 2020-10-25 09:49:21 +01:00
libpostproc Bump minor versions after branching 4.3 2020-06-08 22:49:04 +02:00
libswresample swresample/audioconvert: Fix left shift of negative value 2020-09-30 10:50:45 +02:00
libswscale swscale/utils: override forced-zero formats back to full range 2020-10-11 12:58:13 +03:00
presets
tests tests/audiomatch: removes a warning when compiling tests/audiomatch 2020-10-26 11:20:17 +08:00
tools tools/target_dec_fuzzer: adjust threshold for wmalossless 2020-10-25 09:49:56 +01:00
.gitattributes fate: add SCC test 2017-01-27 17:06:42 +01:00
.gitignore tools/python: add script to convert TensorFlow model (.pb) to native model (.model) 2019-07-01 10:23:47 -03:00
.mailmap mailmap: add entry for myself 2020-07-13 11:24:04 +08:00
.travis.yml Merge commit '899ee03088' 2019-03-14 15:53:16 -03:00
Changelog avformat: add alp muxer 2020-10-25 23:44:26 +10:00
configure configure: check for nvdec/cuvid AV1 support 2020-10-15 23:25:05 +02:00
CONTRIBUTING.md Add CONTRIBUTING.md 2016-09-18 10:02:13 +01:00
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS
INSTALL.md INSTALL.md: Fix Markdown formatting 2019-01-31 10:29:16 -09:00
LICENSE.md avfilter/vf_geq: Relicense to LGPL 2019-12-28 11:20:48 +01:00
MAINTAINERS MAINTAINERS: remove my public key fingerprint 2020-09-20 15:08:18 -08:00
Makefile Add support for building fuzzer tools for an individual demuxer 2020-10-12 21:01:48 +02:00
README.md Remove the ffserver program 2018-01-06 18:31:37 +00:00
RELEASE RELEASE: We are after the 4.3 branch point, update for that 2020-06-10 00:20:24 +02:00

README.md

FFmpeg README

FFmpeg 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.
  • libswresample implements audio mixing and resampling routines.
  • libswscale implements color conversion and scaling routines.

Tools

  • ffmpeg is a command line toolbox to manipulate, convert and stream multimedia content.
  • ffplay is a minimalistic multimedia player.
  • ffprobe is a simple analysis 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

Coding examples are available in the doc/examples directory.

License

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

Contributing

Patches should be submitted to the ffmpeg-devel mailing list using git format-patch or git send-email. Github pull requests should be avoided because they are not part of our review process and will be ignored.