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It is already done by packuswb. Old benchmarks: avg_8_2x2_c: 11.1 ( 1.00x) avg_8_2x2_avx2: 8.6 ( 1.28x) avg_8_4x4_c: 30.0 ( 1.00x) avg_8_4x4_avx2: 10.8 ( 2.78x) avg_8_8x8_c: 132.0 ( 1.00x) avg_8_8x8_avx2: 25.7 ( 5.14x) avg_8_16x16_c: 254.6 ( 1.00x) avg_8_16x16_avx2: 33.2 ( 7.67x) avg_8_32x32_c: 897.5 ( 1.00x) avg_8_32x32_avx2: 115.6 ( 7.76x) avg_8_64x64_c: 3316.9 ( 1.00x) avg_8_64x64_avx2: 626.5 ( 5.29x) avg_8_128x128_c: 12973.6 ( 1.00x) avg_8_128x128_avx2: 1914.0 ( 6.78x) w_avg_8_2x2_c: 16.7 ( 1.00x) w_avg_8_2x2_avx2: 14.4 ( 1.16x) w_avg_8_4x4_c: 48.2 ( 1.00x) w_avg_8_4x4_avx2: 16.5 ( 2.92x) w_avg_8_8x8_c: 168.1 ( 1.00x) w_avg_8_8x8_avx2: 49.7 ( 3.38x) w_avg_8_16x16_c: 392.4 ( 1.00x) w_avg_8_16x16_avx2: 61.1 ( 6.43x) w_avg_8_32x32_c: 1455.3 ( 1.00x) w_avg_8_32x32_avx2: 224.6 ( 6.48x) w_avg_8_64x64_c: 5632.1 ( 1.00x) w_avg_8_64x64_avx2: 896.9 ( 6.28x) w_avg_8_128x128_c: 22136.3 ( 1.00x) w_avg_8_128x128_avx2: 3626.7 ( 6.10x) New benchmarks: avg_8_2x2_c: 12.3 ( 1.00x) avg_8_2x2_avx2: 8.1 ( 1.52x) avg_8_4x4_c: 30.3 ( 1.00x) avg_8_4x4_avx2: 11.3 ( 2.67x) avg_8_8x8_c: 131.8 ( 1.00x) avg_8_8x8_avx2: 21.3 ( 6.20x) avg_8_16x16_c: 255.0 ( 1.00x) avg_8_16x16_avx2: 30.6 ( 8.33x) avg_8_32x32_c: 898.5 ( 1.00x) avg_8_32x32_avx2: 104.9 ( 8.57x) avg_8_64x64_c: 3317.7 ( 1.00x) avg_8_64x64_avx2: 540.9 ( 6.13x) avg_8_128x128_c: 12986.5 ( 1.00x) avg_8_128x128_avx2: 1663.4 ( 7.81x) w_avg_8_2x2_c: 16.8 ( 1.00x) w_avg_8_2x2_avx2: 13.9 ( 1.21x) w_avg_8_4x4_c: 48.2 ( 1.00x) w_avg_8_4x4_avx2: 16.2 ( 2.98x) w_avg_8_8x8_c: 168.6 ( 1.00x) w_avg_8_8x8_avx2: 46.3 ( 3.64x) w_avg_8_16x16_c: 392.4 ( 1.00x) w_avg_8_16x16_avx2: 57.7 ( 6.80x) w_avg_8_32x32_c: 1454.6 ( 1.00x) w_avg_8_32x32_avx2: 214.6 ( 6.78x) w_avg_8_64x64_c: 5638.4 ( 1.00x) w_avg_8_64x64_avx2: 875.6 ( 6.44x) w_avg_8_128x128_c: 22133.5 ( 1.00x) w_avg_8_128x128_avx2: 3334.3 ( 6.64x) Also saves 550B of .text here. The improvements will likely be even better on Win64, because it avoids using two nonvolatile registers in the weighted average case. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
FFmpeg README
FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.
Libraries
libavcodecprovides implementation of a wider range of codecs.libavformatimplements streaming protocols, container formats and basic I/O access.libavutilincludes hashers, decompressors and miscellaneous utility functions.libavfilterprovides means to alter decoded audio and video through a directed graph of connected filters.libavdeviceprovides an abstraction to access capture and playback devices.libswresampleimplements audio mixing and resampling routines.libswscaleimplements 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,ismindexandqt-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.