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Rémi Denis-Courmont 15c3a0bd6e lavc/aacpsdsp: RISC-V V hybrid_analysis 
This starts with one-time initialisation of the 26 constant factors
like  08edacc248. That is done with
the scalar instruction set. While the formula can readily be vectored,
the gains would (probably) be more than lost in transfering the results
back to FP registers (or suitably reshuffling them into vector
registers).

Note that the main loop could likely be scheduled sligthly better by
expanding the filter macro and interleaving loads with arithmetic.
It is not clear yet if that would be relevant for vector processing (as
opposed to traditional SIMD).

We could also use fewer vectors, but there is not much point in sparing
them (they are *all* callee-clobbered).
2022-09-27 13:19:52 +02:00
compat compat/cuda: switch from powf to __powf intrinsic 2022-09-03 20:27:34 +02:00
doc avcodec/avcodec: Deprecate lavc chroma pos API functions 2022-09-26 03:02:49 +02:00
ffbuild configure: probe RISC-V Vector extension 2022-09-27 13:19:52 +02:00
fftools fftools/ffmpeg_filter: configure min_hard_comp unconditionally 2022-09-23 19:58:08 +08:00
libavcodec lavc/aacpsdsp: RISC-V V hybrid_analysis 2022-09-27 13:19:52 +02:00
libavdevice avformat/internal: Don't include avcodec.h 2022-09-26 03:02:50 +02:00
libavfilter avfilter/scale_eval: Reduce rounding error. 2022-09-27 00:07:43 +02:00
libavformat avformat/internal: Don't include avcodec.h 2022-09-26 03:02:50 +02:00
libavutil lavu/fixeddsp: RISC-V V butterflies_fixed 2022-09-27 13:19:52 +02:00
libpostproc
libswresample swsresample/swresample: error out on invalid layouts 2022-09-14 09:52:33 -03:00
libswscale swscale/output: Don't call av_pix_fmt_desc_get() in a loop 2022-09-19 23:40:41 +02:00
presets
tests lavu/cpu: CPU flags for the RISC-V Vector extension 2022-09-27 13:19:52 +02:00
tools tools/target_dec_fuzzer: Adjust threshold for Jpeg2000 2022-09-16 21:30:59 +02:00
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Changelog avformat: add APAC demuxer 2022-09-23 20:27:35 +02:00
configure configure: probe RISC-V Vector extension 2022-09-27 13:19:52 +02:00
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Makefile configure: probe RISC-V Vector extension 2022-09-27 13:19:52 +02:00
README.md
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README.md

FFmpeg README

FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.

Libraries

  • libavcodec provides implementation of a wider range of codecs.
  • libavformat implements streaming protocols, container formats and basic I/O access.
  • libavutil includes hashers, decompressors and miscellaneous utility functions.
  • libavfilter provides means to alter decoded audio and video through a directed graph of connected filters.
  • libavdevice provides an abstraction to access capture and playback devices.
  • libswresample implements audio mixing and resampling routines.
  • libswscale implements 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, ismindex and qt-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.