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Jonas Karlman 2c23dd4ddb avcodec: Add common V4L2 Request API code 
Add common helpers for supporting V4L2 Request API hwaccels.

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

In init video devices is probed and when a capable device is found it is
initialized for decoding. Codec specific CONTROLs may be set to assist
kernel driver. A supported CAPTURE format is selected. A hw frame ctx is
created and CAPTURE buffers is allocated. OUTPUT buffers and request
objects for a circular queue is also allocated.

In frame_params a buffer pool is created and configured to allocate
CAPTURE buffers.

In flush all queued OUTPUT and CAPTURE buffers is dequeued.

In uninit any pending request is flushed, also video and media device is
closed. The media device is not closed when ownership of the media_fd
has been transfered to the hwdevice.

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

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: Add common V4L2 Request API code 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 lavf/assenc: normalize line endings to \n 2024-02-11 17:01:07 -08:00
.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 avutil/hwcontext: Add hwdevice type for V4L2 Request API 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.