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Add optimized Neon code path for the little endian case of the xyz12Torgb48 function. The innermost loop processes the data in 4x2 pixel blocks using software gathers with the matrix multiplication and clipping done by Neon. Relative runtime of micro benchmarks after this patch on some Cortex and Neoverse CPU cores: xyz12le_rgb48le X1 X3 X4 X925 V2 16x4_neon: 2.55x 4.34x 3.84x 3.31x 3.22x 32x4_neon: 2.39x 3.63x 3.22x 3.35x 3.29x 64x4_neon: 2.37x 3.31x 2.91x 3.33x 3.27x 128x4_neon: 2.34x 3.28x 2.91x 3.35x 3.24x 256x4_neon: 2.30x 3.17x 2.91x 3.32x 3.10x 512x4_neon: 2.26x 3.10x 2.91x 3.30x 3.07x 1024x4_neon: 2.26x 3.07x 2.96x 3.30x 3.05x 1920x4_neon: 2.26x 3.06x 2.93x 3.28x 3.04x xyz12le_rgb48le A76 A78 A715 A720 A725 16x4_neon: 2.33x 2.28x 2.53x 3.33x 3.19x 32x4_neon: 2.35x 2.18x 2.45x 3.23x 3.24x 64x4_neon: 2.35x 2.16x 2.42x 3.15x 3.21x 128x4_neon: 2.35x 2.13x 2.39x 3.00x 3.09x 256x4_neon: 2.36x 2.12x 2.35x 2.85x 2.99x 512x4_neon: 2.35x 2.14x 2.35x 2.78x 2.95x 1024x4_neon: 2.31x 2.09x 2.33x 2.80x 2.91x 1920x4_neon: 2.30x 2.07x 2.32x 2.81x 2.94x xyz12le_rgb48le A55 A510 A520 16x4_neon: 2.09x 1.92x 2.36x 32x4_neon: 2.05x 1.89x 2.38x 64x4_neon: 2.02x 1.77x 2.35x 128x4_neon: 1.96x 1.74x 2.25x 256x4_neon: 1.90x 1.72x 2.19x 512x4_neon: 1.83x 1.75x 2.16x 1024x4_neon: 1.83x 1.62x 2.15x 1920x4_neon: 1.82x 1.60x 2.15x Signed-off-by: Arpad Panyik <Arpad.Panyik@arm.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.