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This patch replaces blocks of instructions performing rounding and widening shifts with one-liners achieving the same result. Before and after on A78 dmvr_8_12x20_neon: 86.2 ( 6.90x) dmvr_8_20x12_neon: 94.8 ( 5.93x) dmvr_8_20x20_neon: 141.5 ( 6.50x) dmvr_12_12x20_neon: 158.0 ( 3.76x) dmvr_12_20x12_neon: 151.2 ( 3.73x) dmvr_12_20x20_neon: 247.2 ( 3.71x) dmvr_hv_8_12x20_neon: 423.2 ( 3.75x) dmvr_hv_8_20x12_neon: 434.0 ( 3.69x) dmvr_hv_8_20x20_neon: 706.0 ( 3.69x) dmvr_8_12x20_neon: 77.2 ( 7.70x) dmvr_8_20x12_neon: 66.5 ( 8.49x) dmvr_8_20x20_neon: 92.2 ( 9.90x) dmvr_12_12x20_neon: 80.2 ( 7.38x) dmvr_12_20x12_neon: 58.2 ( 9.59x) dmvr_12_20x20_neon: 90.0 (10.15x) dmvr_hv_8_12x20_neon: 369.0 ( 4.34x) dmvr_hv_8_20x12_neon: 355.8 ( 4.49x) dmvr_hv_8_20x20_neon: 574.2 ( 4.51x) 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.