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As the plain neon qpel_h functions process two rows at a time, we need to allocate storage for h+8 rows instead of h+7. By allocating storage for h+8 rows, incrementing the stack pointer won't end up at the right spot in the end. Store the intended final stack pointer value in a register x14 which we store on the stack. AWS Graviton 3: put_hevc_qpel_uni_hv4_8_c: 384.2 put_hevc_qpel_uni_hv4_8_neon: 127.5 put_hevc_qpel_uni_hv4_8_i8mm: 85.5 put_hevc_qpel_uni_hv6_8_c: 705.5 put_hevc_qpel_uni_hv6_8_neon: 224.5 put_hevc_qpel_uni_hv6_8_i8mm: 176.2 put_hevc_qpel_uni_hv8_8_c: 1136.5 put_hevc_qpel_uni_hv8_8_neon: 216.5 put_hevc_qpel_uni_hv8_8_i8mm: 214.0 put_hevc_qpel_uni_hv12_8_c: 2259.5 put_hevc_qpel_uni_hv12_8_neon: 498.5 put_hevc_qpel_uni_hv12_8_i8mm: 410.7 put_hevc_qpel_uni_hv16_8_c: 3824.7 put_hevc_qpel_uni_hv16_8_neon: 670.0 put_hevc_qpel_uni_hv16_8_i8mm: 603.7 put_hevc_qpel_uni_hv24_8_c: 8113.5 put_hevc_qpel_uni_hv24_8_neon: 1474.7 put_hevc_qpel_uni_hv24_8_i8mm: 1351.5 put_hevc_qpel_uni_hv32_8_c: 14744.5 put_hevc_qpel_uni_hv32_8_neon: 2599.7 put_hevc_qpel_uni_hv32_8_i8mm: 2266.0 put_hevc_qpel_uni_hv48_8_c: 32800.0 put_hevc_qpel_uni_hv48_8_neon: 5650.0 put_hevc_qpel_uni_hv48_8_i8mm: 5011.7 put_hevc_qpel_uni_hv64_8_c: 57856.2 put_hevc_qpel_uni_hv64_8_neon: 9863.5 put_hevc_qpel_uni_hv64_8_i8mm: 8767.7 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.