9 releases
0.0.10 | Nov 6, 2024 |
---|---|
0.0.7 | Aug 2, 2024 |
0.0.6 | Jan 5, 2024 |
0.0.5 | Nov 8, 2023 |
0.0.1 | Jan 17, 2023 |
#46 in Hardware support
3,253 downloads per month
Used in cros-codecs
260KB
6K
SLoC
Libva Rust Wrapper
This crate provides lightweight and (hopefully) safe libva abstractions for use within Rust code with minimal dependencies. It is developed for use in ChromeOS, but has no ChromeOS specifics or dependencies and should thus be usable anywhere.
Dependencies
The native libva library is required at link
time, so make sure to have the libva-dev
or equivalent package for your
distribution installed. The compatible libva version is 1.22.0. The VA-API
driver corresponding to your hardware is also required: for Intel hardware it
will be intel-media-driver, whereas AMD
hardware relies on Mesa.
An easy way to see whether everything is in order is to run the vainfo
utility packaged with libva-utils
or as a standalone package in some
distributions. vainfo
will print the VA-API version, 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.
cros-libva can also be built in Android. Android.bp files are provided that should work on AOSP >= 15. Just check this repository into external/rust/crates/cros-libva and the libcros_libva library target will be available.
Using
The name of this crate is cros-libva
to highlight the fact that it originates
from ChromeOS and it not an official bindings. For ease of use, it is
recommended to rename it to just libva
in your project by using the following
line in your Cargo.toml
:
libva = { package = "cros-libva", version = "0.0.1" }
Testing
For a brief introduction on how to use this crate, see the
libva_utils_mpeg2vldemo
test under src/lib.rs
. You can also quickly test
MPEG2 decoding by running it:
cargo test -- --ignored libva_utils_mpeg2vldemo
Credits
The first version of this crate was written by Daniel Almeida and hosted in the crosvm repository before being split.
Dependencies
~0.4–2.7MB
~56K SLoC