You've already forked FFmpeg
mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2025-08-10 06:10:52 +02:00
83e4b068d9
This patch supplies handwritten NEON code for AAC. The benchmarks below were collected by invoking these two commands on each of my boards, A78, A72 and Thinkpad x13s: 1) ./tests/checkasm/checkasm --test=aacencdsp --bench --runs=12 2) ./ffmpeg -y -t 10:00 -f lavfi -i sine /tmp/foo.aac (the first line is speed without the patch, second, with) - A78 abs_pow34_c: 4161.5 ( 1.00x) abs_pow34_neon: 3586.2 ( 1.16x) quant_bands_signed_c: 5548.0 ( 1.00x) quant_bands_signed_neon: 1126.8 ( 4.92x) quant_bands_unsigned_c: 3979.2 ( 1.00x) quant_bands_unsigned_neon: 800.2 ( 4.97x) size= 5251KiB time=00:10:00.00 bitrate= 71.7kbits/s speed=71.6x size= 5251KiB time=00:10:00.00 bitrate= 71.7kbits/s speed=82.3x - A72 abs_pow34_c: 15362.2 ( 1.00x) abs_pow34_neon: 15382.5 ( 1.00x) quant_bands_signed_c: 9926.5 ( 1.00x) quant_bands_signed_neon: 2467.8 ( 4.02x) quant_bands_unsigned_c: 5469.8 ( 1.00x) quant_bands_unsigned_neon: 2089.5 ( 2.62x) size= 5251KiB time=00:10:00.00 bitrate= 71.7kbits/s speed=34.3x size= 5251KiB time=00:10:00.00 bitrate= 71.7kbits/s speed=37.8 - x13s abs_pow34_c: 2413.4 ( 1.00x) abs_pow34_neon: 1796.2 ( 1.34x) quant_bands_signed_c: 2968.9 ( 1.00x) quant_bands_signed_neon: 675.6 ( 4.39x) quant_bands_unsigned_c: 2311.9 ( 1.00x) quant_bands_unsigned_neon: 477.1 ( 4.85x) size= 5251KiB time=00:10:00.00 bitrate= 71.7kbits/s speed= 135x size= 5251KiB time=00:10:00.00 bitrate= 71.7kbits/s speed= 159x 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.