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This change removes one extra floating point operation and simplifies load operations at the beginning of the loop by using dedicated register for each of the 5 pointers and interleaving it with calculations. The first case seems to be a bit slower, but the performance increase is substantial in the other two. A78 before: postfilter_15_neon: 1684.8 ( 4.23x) postfilter_512_neon: 1395.5 ( 5.10x) postfilter_1022_neon: 1357.0 ( 5.25x) After: postfilter_15_neon: 1742.2 ( 4.09x) postfilter_512_neon: 1169.8 ( 6.09x) postfilter_1022_neon: 1160.0 ( 6.12x) A72 before: postfilter_15_neon: 3144.8 ( 2.39x) postfilter_512_neon: 3141.2 ( 2.39x) postfilter_1022_neon: 3230.0 ( 2.33x) After: postfilter_15_neon: 2847.8 ( 2.64x) postfilter_512_neon: 2877.8 ( 2.61x) postfilter_1022_neon: 2837.2 ( 2.65x) x13s before: postfilter_15_neon: 1615.4 ( 2.61x) postfilter_512_neon: 963.1 ( 4.39x) postfilter_1022_neon: 963.6 ( 4.39x) After: postfilter_15_neon: 1749.6 ( 2.41x) postfilter_512_neon: 707.1 ( 5.97x) postfilter_1022_neon: 706.1 ( 5.99x) 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.