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Currently the AVX2 version of uyvytoyuv422 in the SIMD loop does the following: 4 vinsertq to have interleaving of the vector lanes during load from memory. 4 vperm2i128 inside 4 RSHIFT_COPY calls to achieve the desired layout. This patch replaces the above 8 instructions with 2 vpermq and 2 vpermd with a vector register similar to AVX512ICL version. Observed the following numbers on various microarchitectures: On AMD Zen3 laptop: Before: uyvytoyuv422_c: 51979.7 ( 1.00x) uyvytoyuv422_sse2: 5410.5 ( 9.61x) uyvytoyuv422_avx: 4642.7 (11.20x) uyvytoyuv422_avx2: 4249.0 (12.23x) After: uyvytoyuv422_c: 51659.8 ( 1.00x) uyvytoyuv422_sse2: 5420.8 ( 9.53x) uyvytoyuv422_avx: 4651.2 (11.11x) uyvytoyuv422_avx2: 3953.8 (13.07x) On Intel Macbook Pro 2019: Before: uyvytoyuv422_c: 185014.4 ( 1.00x) uyvytoyuv422_sse2: 22800.4 ( 8.11x) uyvytoyuv422_avx: 19796.9 ( 9.35x) uyvytoyuv422_avx2: 13141.9 (14.08x) After: uyvytoyuv422_c: 185093.4 ( 1.00x) uyvytoyuv422_sse2: 22795.4 ( 8.12x) uyvytoyuv422_avx: 19791.9 ( 9.35x) uyvytoyuv422_avx2: 12043.1 (15.37x) On AMD Zen4 desktop: Before: uyvytoyuv422_c: 29105.0 ( 1.00x) uyvytoyuv422_sse2: 3888.0 ( 7.49x) uyvytoyuv422_avx: 3374.2 ( 8.63x) uyvytoyuv422_avx2: 2649.8 (10.98x) uyvytoyuv422_avx512icl: 1615.0 (18.02x) After: uyvytoyuv422_c: 29093.4 ( 1.00x) uyvytoyuv422_sse2: 3874.4 ( 7.51x) uyvytoyuv422_avx: 3371.6 ( 8.63x) uyvytoyuv422_avx2: 2174.6 (13.38x) uyvytoyuv422_avx512icl: 1625.1 (17.90x) Signed-off-by: Shreesh Adiga <16567adigashreesh@gmail.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.