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This patch removes the use of stack for temporary state and replaces interleaved ld4 loads with ld1. Before/after: A78 hscale_16_to_15__fs_4_dstW_8_neon: 86.8 ( 1.72x) hscale_16_to_15__fs_4_dstW_24_neon: 147.5 ( 2.73x) hscale_16_to_15__fs_4_dstW_128_neon: 614.0 ( 3.14x) hscale_16_to_15__fs_4_dstW_144_neon: 680.5 ( 3.18x) hscale_16_to_15__fs_4_dstW_256_neon: 1193.2 ( 3.19x) hscale_16_to_15__fs_4_dstW_512_neon: 2305.0 ( 3.27x) hscale_16_to_15__fs_4_dstW_8_neon: 86.0 ( 1.74x) hscale_16_to_15__fs_4_dstW_24_neon: 106.8 ( 3.78x) hscale_16_to_15__fs_4_dstW_128_neon: 404.0 ( 4.81x) hscale_16_to_15__fs_4_dstW_144_neon: 451.8 ( 4.80x) hscale_16_to_15__fs_4_dstW_256_neon: 760.5 ( 5.06x) hscale_16_to_15__fs_4_dstW_512_neon: 1520.0 ( 5.01x) A72 hscale_16_to_15__fs_4_dstW_8_neon: 156.8 ( 1.52x) hscale_16_to_15__fs_4_dstW_24_neon: 217.8 ( 2.52x) hscale_16_to_15__fs_4_dstW_128_neon: 906.8 ( 2.90x) hscale_16_to_15__fs_4_dstW_144_neon: 1014.5 ( 2.91x) hscale_16_to_15__fs_4_dstW_256_neon: 1751.5 ( 2.96x) hscale_16_to_15__fs_4_dstW_512_neon: 3469.3 ( 2.97x) hscale_16_to_15__fs_4_dstW_8_neon: 151.2 ( 1.54x) hscale_16_to_15__fs_4_dstW_24_neon: 173.4 ( 3.15x) hscale_16_to_15__fs_4_dstW_128_neon: 660.0 ( 3.98x) hscale_16_to_15__fs_4_dstW_144_neon: 735.7 ( 4.00x) hscale_16_to_15__fs_4_dstW_256_neon: 1273.5 ( 4.09x) hscale_16_to_15__fs_4_dstW_512_neon: 2488.2 ( 4.16x) 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.