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Rémi Denis-Courmont cd7b352c53 lavc/sbrdsp: R-V V autocorrelate 
With 5 accumulator vectors and 6 inputs, this can only use LMUL=2.
Also the number of vector loop iterations is small, just 5 on 128-bit
vector hardware.

The vector loop is somewhat unusual in that it processes data in
descending memory order, in order to save on vector slides:
in descending order, we can extract elements to carry over to the next
iteration from the bottom of the vectors directly. With ascending order
(see in the Opus postfilter function), there are no ways to get the top
elements directly. On the downside, this requires the use of separate
shift and sub (the would-be SH3SUB instruction does not exist), with
a small pipeline stall on the vector load address.

The edge cases in scalar are done in scalar as this saves on loads
and remains significantly faster than C.

autocorrelate_c: 669.2
autocorrelate_rvv_f32: 421.0
2023-11-12 14:03:09 +02:00
compat configure: Set WIN32_LEAN_AND_MEAN at configure time 2023-08-14 22:57:28 +03:00
doc avfilter/avf_showcwt: add fm frequency scaler 2023-11-11 01:19:44 +01:00
ffbuild ffbuild: Add gzip -n flag to fix reproducible builds 2023-11-05 11:30:13 +01:00
fftools fftools/ffmpeg_filter: return an error on ofilter_alloc() failure 2023-11-09 11:25:17 +01:00
libavcodec lavc/sbrdsp: R-V V autocorrelate 2023-11-12 14:03:09 +02:00
libavdevice avdevice/android_camera: fix build failure due to typo 2023-11-07 11:10:07 +08:00
libavfilter avfilter/vf_colortemperature: add gbr(a)pf support 2023-11-12 02:39:44 +01:00
libavformat avformat/hlsenc: Fix name of flag in error message 2023-11-12 16:47:40 +08:00
libavutil lavu/log: do not assume AVClass.item_name is always set 2023-11-09 11:25:17 +01:00
libpostproc Bump versions after 6.1 2023-10-29 16:19:14 +01:00
libswresample Bump versions after 6.1 2023-10-29 16:19:14 +01:00
libswscale swscale/yuv2rgb: fix sws_getCoefficients for colorspace=0 2023-11-09 12:53:35 +01:00
presets
tests avcodec/pnm: explicitly tag color range 2023-11-09 12:53:35 +01:00
tools tools/target_dec_fuzzer: Adjust threshold for CSCD 2023-11-01 16:40:21 +01:00
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.travis.yml
Changelog avcodec: LEAD MCMP decoder 2023-11-08 17:37:58 +11:00
configure avcodec: LEAD MCMP decoder 2023-11-08 17:37:58 +11:00
CONTRIBUTING.md
COPYING.GPLv2
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CREDITS Use https for repository links 2023-03-01 21:59:10 +01:00
INSTALL.md
LICENSE.md
MAINTAINERS MAINTAINERS: add myself as a mediacodec and videotoolbox maintainer 2023-11-08 16:15:04 +08:00
Makefile tools: Don't include the direct library names when linking 2023-10-02 22:49:07 +03:00
README.md
RELEASE RELEASE: update after 5.1 branch 2022-07-13 00:31:42 +02:00

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.