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f9b8f30680
This patch replaces integer widening with halving addition, and multi-step "emulated" rounding shift with a single asm instruction doing exactly that. Benchmarks before and after: A78 avg_8_64x64_neon: 2686.2 ( 6.12x) avg_8_128x128_neon: 10734.2 ( 5.88x) avg_10_64x64_neon: 2536.8 ( 5.40x) avg_10_128x128_neon: 10079.0 ( 5.22x) avg_12_64x64_neon: 2548.2 ( 5.38x) avg_12_128x128_neon: 10133.8 ( 5.19x) avg_8_64x64_neon: 897.8 (18.26x) avg_8_128x128_neon: 3608.5 (17.37x) avg_10_32x32_neon: 444.2 ( 8.51x) avg_10_64x64_neon: 1711.8 ( 8.00x) avg_12_64x64_neon: 1706.2 ( 8.02x) avg_12_128x128_neon: 7010.0 ( 7.46x) A72 avg_8_64x64_neon: 5823.4 ( 3.88x) avg_8_128x128_neon: 17430.5 ( 4.73x) avg_10_64x64_neon: 5228.1 ( 3.71x) avg_10_128x128_neon: 16722.2 ( 4.17x) avg_12_64x64_neon: 5379.1 ( 3.51x) avg_12_128x128_neon: 16715.7 ( 4.17x) avg_8_64x64_neon: 2006.5 (10.61x) avg_8_128x128_neon: 9158.7 ( 8.96x) avg_10_64x64_neon: 3357.7 ( 5.60x) avg_10_128x128_neon: 12411.7 ( 5.56x) avg_12_64x64_neon: 3317.5 ( 5.67x) avg_12_128x128_neon: 12358.5 ( 5.58x) A53 avg_8_64x64_neon: 8327.8 ( 5.18x) avg_8_128x128_neon: 31631.3 ( 5.34x) avg_10_64x64_neon: 8783.5 ( 4.98x) avg_10_128x128_neon: 32617.0 ( 5.25x) avg_12_64x64_neon: 8686.0 ( 5.06x) avg_12_128x128_neon: 32487.5 ( 5.25x) avg_8_64x64_neon: 6032.3 ( 7.17x) avg_8_128x128_neon: 22008.5 ( 7.69x) avg_10_64x64_neon: 7738.0 ( 5.68x) avg_10_128x128_neon: 27813.8 ( 6.14x) avg_12_64x64_neon: 7844.5 ( 5.60x) avg_12_128x128_neon: 26999.5 ( 6.34x) Signed-off-by: Martin Storsjö <martin@martin.st>
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.