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Jonas Karlman b11df48149 avcodec/v4l2request: Add common decode support for hwaccels 
Add common support for decoding using the V4L2 Request API.

Basic flow for decoding follow the kernel Memory-to-memory Stateless
Video Decoder Interface > Decoding [1].

A codec hwaccel typically handle decoding as follow:

In start_frame next OUTPUT buffer and its related request object is
picked from a circular queue and any codec specific CONTROLs is prepared.

In decode_slice the slice bitstream data is appended to the OUTPUT
buffer.

In end_frame a CAPTURE buffer tied to the AVFrame is queued, it will be
used as the decoding target by the driver / hw decoder. The prepared
codec specific CONTROLs get queued as part of the request object.
Finally the request object is submitted for decoding.

For slice based hw decoders only the request for the final slice of the
frame is submitted in end_frame, remaining is submitted in decode_slice.

[1] https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/dev-stateless-decoder.html#decoding

Co-developed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Co-developed-by: Alex Bee <knaerzche@gmail.com>
Signed-off-by: Alex Bee <knaerzche@gmail.com>
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
2025-07-09 20:38:47 +00:00
compat compat: Fix the fallback definition of stdc_trailing_zeros 2024-09-24 14:00:27 +03:00
doc Update for 7.1 2024-09-29 18:47:04 +02:00
ffbuild riscv: add Zvbb vector bit manipulation extension 2024-05-11 11:38:49 +03:00
fftools fftools/ffmpeg: add support for multiview video 2024-09-23 17:15:02 +02:00
libavcodec avcodec/v4l2request: Add common decode support for hwaccels 2025-07-09 20:38:47 +00:00
libavdevice avdevice/decklink_dec: fix leaks on error 2024-09-29 10:30:49 +02:00
libavfilter avfilter/vf_showinfo: add missing break to ViewID case 2024-09-24 16:09:05 -03:00
libavformat */version.h: bump minor versions for release/7.1 2024-09-24 17:07:30 +02:00
libavutil avutil/hwcontext: Add hwdevice type for V4L2 Request API 2025-07-09 20:38:47 +00:00
libpostproc */version.h: bump minor versions for release/7.1 2024-09-24 17:07:30 +02:00
libswresample */version.h: bump minor versions for release/7.1 2024-09-24 17:07:30 +02:00
libswscale */version.h: bump minor versions for release/7.1 2024-09-24 17:07:30 +02:00
presets
tests checkasm/sw_rgb: Revert test additions from e18b46d95f 2024-09-29 14:23:06 +03:00
tools tools/target_swr_fuzzer: Limit the number of samples 2024-09-24 15:37:18 +02:00
.gitattributes
.gitignore
.mailmap mailmap: add entry for myself 2024-07-15 01:59:37 +02:00
Changelog Changelog: Mark for 7.1 2024-09-24 17:05:48 +02:00
configure avcodec/v4l2request: Add common decode support for hwaccels 2025-07-09 20:38:47 +00:00
CONTRIBUTING.md
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1
COPYING.LGPLv3
CREDITS
INSTALL.md
LICENSE.md
MAINTAINERS avcodec: Add common V4L2 Request API code 2025-07-09 20:38:47 +00:00
Makefile add tools/target_swr_fuzzer 2024-08-08 15:26:52 +02:00
README.md
RELEASE Update for 7.1 2024-09-29 18:47:04 +02:00
RELEASE_NOTES RELEASE_NOTES: Based on the version from 5.1 2024-09-29 18:47:04 +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.