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if the float pixel * 65535.0f > 2147483647.0f lrintf may overfow and return negative values, depending on implementation. nan and +/-inf values may also be implementation defined clip the value first so lrintf always works. values < 0.0f, -inf, nan = 0.0f values > 65535.0f, +inf = 65535.0f old timings 195960 decicycles in planar_rgbf32le_to_uv, 1 runs, 0 skips 186120 decicycles in planar_rgbf32le_to_uv, 2 runs, 0 skips 188645 decicycles in planar_rgbf32le_to_uv, 4 runs, 0 skips 183625 decicycles in planar_rgbf32le_to_uv, 8 runs, 0 skips 181157 decicycles in planar_rgbf32le_to_uv, 16 runs, 0 skips 177533 decicycles in planar_rgbf32le_to_uv, 32 runs, 0 skips 175689 decicycles in planar_rgbf32le_to_uv, 64 runs, 0 skips 232960 decicycles in planar_rgbf32be_to_uv, 1 runs, 0 skips 221380 decicycles in planar_rgbf32be_to_uv, 2 runs, 0 skips 216640 decicycles in planar_rgbf32be_to_uv, 4 runs, 0 skips 213505 decicycles in planar_rgbf32be_to_uv, 8 runs, 0 skips 211558 decicycles in planar_rgbf32be_to_uv, 16 runs, 0 skips 210596 decicycles in planar_rgbf32be_to_uv, 32 runs, 0 skips 210202 decicycles in planar_rgbf32be_to_uv, 64 runs, 0 skips 161680 decicycles in planar_rgbf32le_to_y, 1 runs, 0 skips 153540 decicycles in planar_rgbf32le_to_y, 2 runs, 0 skips 148255 decicycles in planar_rgbf32le_to_y, 4 runs, 0 skips 140600 decicycles in planar_rgbf32le_to_y, 8 runs, 0 skips 132935 decicycles in planar_rgbf32le_to_y, 16 runs, 0 skips 128531 decicycles in planar_rgbf32le_to_y, 32 runs, 0 skips 140933 decicycles in planar_rgbf32le_to_y, 64 runs, 0 skips 190980 decicycles in planar_rgbf32be_to_y, 1 runs, 0 skips 176080 decicycles in planar_rgbf32be_to_y, 2 runs, 0 skips 167980 decicycles in planar_rgbf32be_to_y, 4 runs, 0 skips 164685 decicycles in planar_rgbf32be_to_y, 8 runs, 0 skips 162751 decicycles in planar_rgbf32be_to_y, 16 runs, 0 skips 162404 decicycles in planar_rgbf32be_to_y, 32 runs, 0 skips 167849 decicycles in planar_rgbf32be_to_y, 64 runs, 0 skips new timings 183320 decicycles in planar_rgbf32le_to_uv, 1 runs, 0 skips 175700 decicycles in planar_rgbf32le_to_uv, 2 runs, 0 skips 179570 decicycles in planar_rgbf32le_to_uv, 4 runs, 0 skips 172932 decicycles in planar_rgbf32le_to_uv, 8 runs, 0 skips 168707 decicycles in planar_rgbf32le_to_uv, 16 runs, 0 skips 165224 decicycles in planar_rgbf32le_to_uv, 32 runs, 0 skips 163423 decicycles in planar_rgbf32le_to_uv, 64 runs, 0 skips 184940 decicycles in planar_rgbf32be_to_uv, 1 runs, 0 skips 185150 decicycles in planar_rgbf32be_to_uv, 2 runs, 0 skips 185790 decicycles in planar_rgbf32be_to_uv, 4 runs, 0 skips 185472 decicycles in planar_rgbf32be_to_uv, 8 runs, 0 skips 185277 decicycles in planar_rgbf32be_to_uv, 16 runs, 0 skips 185813 decicycles in planar_rgbf32be_to_uv, 32 runs, 0 skips 185332 decicycles in planar_rgbf32be_to_uv, 64 runs, 0 skips 145400 decicycles in planar_rgbf32le_to_y, 1 runs, 0 skips 145100 decicycles in planar_rgbf32le_to_y, 2 runs, 0 skips 143490 decicycles in planar_rgbf32le_to_y, 4 runs, 0 skips 136687 decicycles in planar_rgbf32le_to_y, 8 runs, 0 skips 131271 decicycles in planar_rgbf32le_to_y, 16 runs, 0 skips 128698 decicycles in planar_rgbf32le_to_y, 32 runs, 0 skips 127170 decicycles in planar_rgbf32le_to_y, 64 runs, 0 skips 156020 decicycles in planar_rgbf32be_to_y, 1 runs, 0 skips 146990 decicycles in planar_rgbf32be_to_y, 2 runs, 0 skips 142020 decicycles in planar_rgbf32be_to_y, 4 runs, 0 skips 141052 decicycles in planar_rgbf32be_to_y, 8 runs, 0 skips 138973 decicycles in planar_rgbf32be_to_y, 16 runs, 0 skips 138027 decicycles in planar_rgbf32be_to_y, 32 runs, 0 skips 143939 decicycles in planar_rgbf32be_to_y, 64 runs, 0 skips Reviewed-by: Michael Niedermayer <michael@niedermayer.cc> Signed-off-by: James Almer <jamrial@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.