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62e6b634a8
In function ff_h264_add_pixels4_8_mmi, there is no need to reset '%[ftmp0]' to 0, because it's value has never changed since the start of the asm block. This patch remove the redundant 'xor' and set src to zero once it was loaded. In function ff_h264_idct_add_8_mmi, 'block' is seted to zero twice. This patch removed the first setting zero operation and move the second one after the load operation of block. In function ff_h264_idct8_add_8_mmi, 'block' is seted to zero twice too. This patch just removed the second setting zero operation. This patch mainly simplifies the implementation of functions above, the effect on the performance of whole h264 decoding process is not obvious. According to the perf data, proportion of ff_h264_idct_add_8_mmi decreased from 0.29% to 0.26% and ff_h264_idct8_add_8_mmi decreased from 0.62% to 0.59% when decoding H264 format on loongson 3A3000(For reference only , not very stable.). Reviewed-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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 a mean to alter decoded Audio and Video through chain of 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.