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crosvm/media/libva
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Daniel Almeida 1733c995dd media: libva: picture: add new_from_same_surface 
In preparation for interlaced support, allow for picture creation using
another picture's Surface. This is so one can decode both fields to the
same underlying surface.

BUG=b:214478588
TEST="cargo build --features=video-decoder,vaapi" successfully builds
the libva crate

Change-Id: If3ffcc2592b7213644ed92f7202502fc92bac4b3
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/3783005
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
2022-10-12 07:55:06 +00:00
..
src media: libva: picture: add new_from_same_surface 2022-10-12 07:55:06 +00:00
bindgen.sh
build.rs
Cargo.toml
libva-wrapper.h
README.md

README.md

Libva Rust wrapper

Rust wrapper for libva. Provides safe libva abstractions for use within Rust code using its own bindgen-generated bindings.

This crate is used as part of the VirtIO Video VA-API backend. VA-API uses the GPU to perform the actual decoding/encoding of frames. In doing so, it frees the CPU for other uses and reduces power usage in the system. Hardware accelerated media workflows also tend to be faster than their software counterparts.

Note: This create requires the native libva library at link time. It also requires a VA-API driver to be installed on the system. The VA-API driver to use depends on the underlying hardware, e.g.: the implementation for Intel hardware is in intel-media-driver, whereas AMD hardware will depend on Mesa.

An easy way to see whether everything is in order is to run the vainfo utility. This is usually packaged with libva-utils or as a standalone package in some distributions. vainfo will print the VA-API version, the driver string, and a list of supported profiles and endpoints, i.e.:

vainfo: VA-API version: 1.13 (libva 2.13.0)
vainfo: Driver version: Intel iHD driver for Intel(R) Gen Graphics - 22.2.2 ()
vainfo: Supported profile and entrypoints
      VAProfileNone                   : VAEntrypointVideoProc
      VAProfileNone                   : VAEntrypointStats
      VAProfileMPEG2Simple            : VAEntrypointVLD
      VAProfileMPEG2Simple            : VAEntrypointEncSlice
      VAProfileMPEG2Main              : VAEntrypointVLD
      VAProfileMPEG2Main              : VAEntrypointEncSlice
      VAProfileH264Main               : VAEntrypointVLD
      etc

For decoding, the desired profile must be supported under VAEntrypointVLD. For example, in order to decode VP8 media, this line must be present in the output of vainfo:

      VAProfileVP8Version0_3          : VAEntrypointVLD

Whereas to decode H264 Main profile media, this line must be present:

      VAProfileH264Main               : VAEntrypointVLD

For more information on VA-API and its usage within ChromeOS, see this guide.

For a brief introduction on how to use this crate, see the libva_utils_mpeg2vldemo test under src/lib.rs.