mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2026-10-28 10:04:37 +08:00
Jun Zhao
91ae6d10ab
Implement NEON optimization for compute_weights_line. Also update the function signature to use ptrdiff_t for stack arguments (max_meaningful_diff, startx, endx). This is done to unify the stack layout between Apple platforms (which pack 32-bit stack arguments tightly) and the generic AAPCS64 ABI (which requires 8-byte stack slots for 32-bit arguments). Using ptrdiff_t ensures 8-byte slots are used on all AArch64 platforms, avoiding ABI mismatches with the assembly implementation. The x86 AVX2 prototype is updated to match the new signature. Performance benchmark (AArch64) in MacOS M4: ./tests/checkasm/checkasm --test=vf_nlmeans --bench compute_weights_line_c: 151.1 ( 1.00x) compute_weights_line_neon: 62.6 ( 2.42x) Reviewed-by: Martin Storsjö <martin@martin.st> Signed-off-by: Jun Zhao <barryjzhao@tencent.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.