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The benchmarks (before vs after) were gathered using ./tests/checkasm/checkasm --test=sw_scale --bench --runs=6 | grep yuv2yuv1 A78 before: yuv2yuv1_0_512_accurate_c: 2039.5 ( 1.00x) yuv2yuv1_0_512_accurate_neon: 385.5 ( 5.29x) yuv2yuv1_0_512_approximate_c: 2110.5 ( 1.00x) yuv2yuv1_0_512_approximate_neon: 385.5 ( 5.47x) yuv2yuv1_3_512_accurate_c: 2061.2 ( 1.00x) yuv2yuv1_3_512_accurate_neon: 381.2 ( 5.41x) yuv2yuv1_3_512_approximate_c: 2099.2 ( 1.00x) yuv2yuv1_3_512_approximate_neon: 381.2 ( 5.51x) yuv2yuv1_8_512_accurate_c: 2054.2 ( 1.00x) yuv2yuv1_8_512_accurate_neon: 385.5 ( 5.33x) yuv2yuv1_8_512_approximate_c: 2112.2 ( 1.00x) yuv2yuv1_8_512_approximate_neon: 385.5 ( 5.48x) yuv2yuv1_11_512_accurate_c: 2036.0 ( 1.00x) yuv2yuv1_11_512_accurate_neon: 381.2 ( 5.34x) yuv2yuv1_11_512_approximate_c: 2115.0 ( 1.00x) yuv2yuv1_11_512_approximate_neon: 381.2 ( 5.55x) yuv2yuv1_16_512_accurate_c: 2066.5 ( 1.00x) yuv2yuv1_16_512_accurate_neon: 385.5 ( 5.36x) yuv2yuv1_16_512_approximate_c: 2100.8 ( 1.00x) yuv2yuv1_16_512_approximate_neon: 385.5 ( 5.45x) yuv2yuv1_19_512_accurate_c: 2059.8 ( 1.00x) yuv2yuv1_19_512_accurate_neon: 381.2 ( 5.40x) yuv2yuv1_19_512_approximate_c: 2102.8 ( 1.00x) yuv2yuv1_19_512_approximate_neon: 381.2 ( 5.52x) After: yuv2yuv1_0_512_accurate_c: 2206.0 ( 1.00x) yuv2yuv1_0_512_accurate_neon: 139.2 (15.84x) yuv2yuv1_0_512_approximate_c: 2050.0 ( 1.00x) yuv2yuv1_0_512_approximate_neon: 139.2 (14.72x) yuv2yuv1_3_512_accurate_c: 2205.2 ( 1.00x) yuv2yuv1_3_512_accurate_neon: 138.0 (15.98x) yuv2yuv1_3_512_approximate_c: 2052.5 ( 1.00x) yuv2yuv1_3_512_approximate_neon: 138.0 (14.87x) yuv2yuv1_8_512_accurate_c: 2171.0 ( 1.00x) yuv2yuv1_8_512_accurate_neon: 139.2 (15.59x) yuv2yuv1_8_512_approximate_c: 2064.2 ( 1.00x) yuv2yuv1_8_512_approximate_neon: 139.2 (14.82x) yuv2yuv1_11_512_accurate_c: 2164.8 ( 1.00x) yuv2yuv1_11_512_accurate_neon: 138.0 (15.69x) yuv2yuv1_11_512_approximate_c: 2048.8 ( 1.00x) yuv2yuv1_11_512_approximate_neon: 138.0 (14.85x) yuv2yuv1_16_512_accurate_c: 2154.5 ( 1.00x) yuv2yuv1_16_512_accurate_neon: 139.2 (15.47x) yuv2yuv1_16_512_approximate_c: 2047.2 ( 1.00x) yuv2yuv1_16_512_approximate_neon: 139.2 (14.70x) yuv2yuv1_19_512_accurate_c: 2144.5 ( 1.00x) yuv2yuv1_19_512_accurate_neon: 138.0 (15.54x) yuv2yuv1_19_512_approximate_c: 2046.0 ( 1.00x) yuv2yuv1_19_512_approximate_neon: 138.0 (14.83x) A72 before: yuv2yuv1_0_512_accurate_c: 3779.8 ( 1.00x) yuv2yuv1_0_512_accurate_neon: 527.8 ( 7.16x) yuv2yuv1_0_512_approximate_c: 4128.2 ( 1.00x) yuv2yuv1_0_512_approximate_neon: 528.2 ( 7.81x) yuv2yuv1_3_512_accurate_c: 3836.2 ( 1.00x) yuv2yuv1_3_512_accurate_neon: 527.0 ( 7.28x) yuv2yuv1_3_512_approximate_c: 3991.0 ( 1.00x) yuv2yuv1_3_512_approximate_neon: 526.8 ( 7.58x) yuv2yuv1_8_512_accurate_c: 3732.8 ( 1.00x) yuv2yuv1_8_512_accurate_neon: 525.5 ( 7.10x) yuv2yuv1_8_512_approximate_c: 4060.0 ( 1.00x) yuv2yuv1_8_512_approximate_neon: 527.0 ( 7.70x) yuv2yuv1_11_512_accurate_c: 3836.2 ( 1.00x) yuv2yuv1_11_512_accurate_neon: 530.0 ( 7.24x) yuv2yuv1_11_512_approximate_c: 4014.0 ( 1.00x) yuv2yuv1_11_512_approximate_neon: 530.0 ( 7.57x) yuv2yuv1_16_512_accurate_c: 3726.2 ( 1.00x) yuv2yuv1_16_512_accurate_neon: 525.5 ( 7.09x) yuv2yuv1_16_512_approximate_c: 4114.2 ( 1.00x) yuv2yuv1_16_512_approximate_neon: 526.2 ( 7.82x) yuv2yuv1_19_512_accurate_c: 3812.2 ( 1.00x) yuv2yuv1_19_512_accurate_neon: 530.0 ( 7.19x) yuv2yuv1_19_512_approximate_c: 4012.2 ( 1.00x) yuv2yuv1_19_512_approximate_neon: 530.0 ( 7.57x) After: yuv2yuv1_0_512_accurate_c: 3716.8 ( 1.00x) yuv2yuv1_0_512_accurate_neon: 215.1 (17.28x) yuv2yuv1_0_512_approximate_c: 3877.8 ( 1.00x) yuv2yuv1_0_512_approximate_neon: 222.8 (17.40x) yuv2yuv1_3_512_accurate_c: 3717.1 ( 1.00x) yuv2yuv1_3_512_accurate_neon: 217.8 (17.06x) yuv2yuv1_3_512_approximate_c: 3801.6 ( 1.00x) yuv2yuv1_3_512_approximate_neon: 220.3 (17.25x) yuv2yuv1_8_512_accurate_c: 3716.6 ( 1.00x) yuv2yuv1_8_512_accurate_neon: 213.8 (17.38x) yuv2yuv1_8_512_approximate_c: 3831.8 ( 1.00x) yuv2yuv1_8_512_approximate_neon: 218.1 (17.57x) yuv2yuv1_11_512_accurate_c: 3717.1 ( 1.00x) yuv2yuv1_11_512_accurate_neon: 219.1 (16.97x) yuv2yuv1_11_512_approximate_c: 3801.6 ( 1.00x) yuv2yuv1_11_512_approximate_neon: 216.1 (17.59x) yuv2yuv1_16_512_accurate_c: 3716.6 ( 1.00x) yuv2yuv1_16_512_accurate_neon: 213.6 (17.40x) yuv2yuv1_16_512_approximate_c: 3831.6 ( 1.00x) yuv2yuv1_16_512_approximate_neon: 215.1 (17.82x) yuv2yuv1_19_512_accurate_c: 3717.1 ( 1.00x) yuv2yuv1_19_512_accurate_neon: 223.8 (16.61x) yuv2yuv1_19_512_approximate_c: 3801.6 ( 1.00x) yuv2yuv1_19_512_approximate_neon: 219.1 (17.35x) x13s before: yuv2yuv1_0_512_accurate_c: 1435.1 ( 1.00x) yuv2yuv1_0_512_accurate_neon: 221.1 ( 6.49x) yuv2yuv1_0_512_approximate_c: 1405.4 ( 1.00x) yuv2yuv1_0_512_approximate_neon: 219.1 ( 6.41x) yuv2yuv1_3_512_accurate_c: 1418.6 ( 1.00x) yuv2yuv1_3_512_accurate_neon: 215.9 ( 6.57x) yuv2yuv1_3_512_approximate_c: 1405.9 ( 1.00x) yuv2yuv1_3_512_approximate_neon: 224.1 ( 6.27x) yuv2yuv1_8_512_accurate_c: 1433.9 ( 1.00x) yuv2yuv1_8_512_accurate_neon: 218.6 ( 6.56x) yuv2yuv1_8_512_approximate_c: 1412.9 ( 1.00x) yuv2yuv1_8_512_approximate_neon: 218.9 ( 6.46x) yuv2yuv1_11_512_accurate_c: 1449.1 ( 1.00x) yuv2yuv1_11_512_accurate_neon: 217.6 ( 6.66x) yuv2yuv1_11_512_approximate_c: 1410.9 ( 1.00x) yuv2yuv1_11_512_approximate_neon: 221.1 ( 6.38x) yuv2yuv1_16_512_accurate_c: 1402.1 ( 1.00x) yuv2yuv1_16_512_accurate_neon: 214.6 ( 6.53x) yuv2yuv1_16_512_approximate_c: 1422.4 ( 1.00x) yuv2yuv1_16_512_approximate_neon: 222.9 ( 6.38x) yuv2yuv1_19_512_accurate_c: 1421.6 ( 1.00x) yuv2yuv1_19_512_accurate_neon: 217.4 ( 6.54x) yuv2yuv1_19_512_approximate_c: 1421.6 ( 1.00x) yuv2yuv1_19_512_approximate_neon: 221.4 ( 6.42x) After: yuv2yuv1_0_512_accurate_c: 1413.6 ( 1.00x) yuv2yuv1_0_512_accurate_neon: 80.6 (17.53x) yuv2yuv1_0_512_approximate_c: 1455.6 ( 1.00x) yuv2yuv1_0_512_approximate_neon: 80.6 (18.05x) yuv2yuv1_3_512_accurate_c: 1429.1 ( 1.00x) yuv2yuv1_3_512_accurate_neon: 77.4 (18.47x) yuv2yuv1_3_512_approximate_c: 1462.6 ( 1.00x) yuv2yuv1_3_512_approximate_neon: 80.6 (18.14x) yuv2yuv1_8_512_accurate_c: 1425.4 ( 1.00x) yuv2yuv1_8_512_accurate_neon: 77.9 (18.30x) yuv2yuv1_8_512_approximate_c: 1436.6 ( 1.00x) yuv2yuv1_8_512_approximate_neon: 80.9 (17.76x) yuv2yuv1_11_512_accurate_c: 1429.4 ( 1.00x) yuv2yuv1_11_512_accurate_neon: 76.1 (18.78x) yuv2yuv1_11_512_approximate_c: 1447.1 ( 1.00x) yuv2yuv1_11_512_approximate_neon: 78.4 (18.46x) yuv2yuv1_16_512_accurate_c: 1439.9 ( 1.00x) yuv2yuv1_16_512_accurate_neon: 77.6 (18.55x) yuv2yuv1_16_512_approximate_c: 1422.1 ( 1.00x) yuv2yuv1_16_512_approximate_neon: 78.1 (18.20x) yuv2yuv1_19_512_accurate_c: 1447.1 ( 1.00x) yuv2yuv1_19_512_accurate_neon: 78.1 (18.52x) yuv2yuv1_19_512_approximate_c: 1474.4 ( 1.00x) yuv2yuv1_19_512_approximate_neon: 78.1 (18.87x) 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.