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android / platform / system / cros-codecs / d68e18e
commitd68e18e46e815a722e7e90af55b5846b72ba77e2[log] [tgz]
authorJustin Green <greenjustin@google.com>Thu Mar 27 17:07:21 2025 -0400
committerJustin Green <greenjustin@google.com>Thu Mar 27 18:37:00 2025 -0400
tree7bfe4d3dbca62c65ebe5b2ba07430af86c8e5530
parent7ba8cfc97ff884d3bf54411cf4b61d006d3ef224 [diff]
Correctly plumb VP9 timestamps on V4L2

We needed unique timestamps for VP9 hidden frames on V4L2 in order to
correctly keep track of the underlying V4l2Request, but the HAL
ultimately needs the correct timestamp in order to recreate the C2Work
object. As a compromise, we can bitshift the real timestamp left by 1
bit and use the new LSB to encode deduplication information. This will
technically overflow for videos that are ~600 million years long.

Bug: b:406839591
Test: Watching youtube on Corsola
Test: Watching crosvideo.appspot.com on Corsola
Test: Watching local videos on Corsola

Change-Id: Ib2cd9e7222f600b07c3fb6849a1cb710fe668e7e
5 files changed
tree: 7bfe4d3dbca62c65ebe5b2ba07430af86c8e5530
  1. .cargo/
  2. ci/
  3. examples/
  4. fuzz/
  5. src/
  6. test/
  7. .clippy.toml
  8. .gitignore
  9. Android.bp
  10. Cargo.toml
  11. cargo_embargo.json
  12. CONTRIBUTING.md
  13. DIR_METADATA
  14. LICENSE
  15. METADATA
  16. MODULE_LICENSE_BSD
  17. OWNERS
  18. README.md
  19. rustfmt.toml
  20. simple_test.py
README.md

Cros-codecs

A lightweight, simple, low-dependency, and hopefully safe crate for hardware-accelerated video decoding and encoding on Linux.

It is developed for use in ChromeOS (particularly crosvm), but has no dependency to ChromeOS and should be usable anywhere.

Current features

  • Simple decoder API,
  • VAAPI decoder support (using cros-libva) for H.264, H.265, VP8, VP9 and AV1,
  • VAAPI encoder support for H.264, VP9 and AV1,
  • Stateful V4L2 encoder support.

Planned features

  • Stateful V4L2 decoder support,
  • Stateless V4L2 decoder support,
  • Support for more encoder codecs,
  • C API to be used in non-Rust projects.

Non-goals

  • Support for systems other than Linux.

Example programs

The ccdec example program can decode an encoded stream and write the decoded frames to a file. As such it can be used for testing purposes.

$ cargo build --examples
$ ./target/debug/examples/ccdec --help
Usage: ccdec <input> [--output <output>] --input-format <input-format> [--output-format <output-format>] [--compute-md5 <compute-md5>]

Simple player using cros-codecs

Positional Arguments:
  input             input file

Options:
  --output          output file to write the decoded frames to
  --input-format    input format to decode from.
  --output-format   pixel format to decode into. Default: i420
  --compute-md5     whether to display the MD5 of the decoded stream, and at
                    which granularity (stream or frame)
  --help            display usage information

Testing

Fluster can be used for testing, using the ccdec example program described above. This branch contains support for cros-codecs testing. Just make sure the ccdec binary is in your PATH, and run Fluster using one of the ccdec decoders, e.g.

python fluster.py run -d ccdec-H.264 -ts JVT-AVC_V1

Credits

The majority of the code in the initial commit has been written by Daniel Almeida as a VAAPI backend for crosvm, before being split into this crate.