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This commit pieces together the previous few commits to implement the NEON backend for sws_ops. In essence, a tool which runs on the target (sws_ops_aarch64) is used to enumerate all the functions that the backend needs to implement. The list it generates is stored in the repository (ops_entries.c). The list from above is used at build time by a code generator tool (ops_asmgen) to implement all the sws_ops functions the NEON backend supports, and generate a lookup function in C to retrieve the assembly function pointers. At runtime, the NEON backend fetches the function pointers to the assembly functions and chains them together in a continuation-passing style design, similar to the x86 backend. The following speedup is observed from legacy swscale to NEON: A520: Overall speedup=3.780x faster, min=0.137x max=91.928x A720: Overall speedup=4.129x faster, min=0.234x max=92.424x And the following from the C sws_ops implementation to NEON: A520: Overall speedup=5.513x faster, min=0.927x max=14.169x A720: Overall speedup=4.786x faster, min=0.585x max=20.157x The slowdowns from legacy to NEON are the same for C/x86. Mostly low bit-depth conversions that did not perform dithering in legacy. The 0.585x outlier from C to NEON is gbrpf32le -> gbrapf32le, which is mostly memcpy with the C implementation. All other conversions are better. Sponsored-by: Sovereign Tech Fund Signed-off-by: Ramiro Polla <ramiro.polla@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.