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clang does better than the assembly code before the patch, especially for small size: hevc_idct_4x4_dc_8_c: 11.2 ( 1.00x) hevc_idct_4x4_dc_8_neon: 15.5 ( 0.73x) hevc_idct_4x4_dc_10_c: 12.0 ( 1.00x) hevc_idct_4x4_dc_10_neon: 15.2 ( 0.79x) hevc_idct_8x8_dc_8_c: 13.2 ( 1.00x) hevc_idct_8x8_dc_8_neon: 18.2 ( 0.73x) hevc_idct_8x8_dc_10_c: 13.5 ( 1.00x) hevc_idct_8x8_dc_10_neon: 17.2 ( 0.78x) hevc_idct_16x16_dc_8_c: 41.8 ( 1.00x) hevc_idct_16x16_dc_8_neon: 37.8 ( 1.11x) hevc_idct_16x16_dc_10_c: 41.8 ( 1.00x) hevc_idct_16x16_dc_10_neon: 37.8 ( 1.11x) hevc_idct_32x32_dc_8_c: 130.2 ( 1.00x) hevc_idct_32x32_dc_8_neon: 132.2 ( 0.98x) hevc_idct_32x32_dc_10_c: 130.2 ( 1.00x) hevc_idct_32x32_dc_10_neon: 132.2 ( 0.98x) This patch basically clone what the compiler does, so the performance is the same. Reviewed-by: Martin Storsjö <martin@martin.st> Signed-off-by: Zhao Zhili <zhilizhao@tencent.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.