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crosvm/media/libvda
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Alexandre Courbot 839577a796 media: libvda: allow to build without linking to libvda 
libvda is only available on ChromeOS, and being unable to link to it
with regular builds reduces our build coverage.

Add a "libvda-stub" feature that, if enabled, results in dummy C stubs
being build for all the exported libvda functions. This allows builds
with the "libvda" feature to pass, although of course the resulting
video device would immediately crash and thus should not be used.

BUG=b:244619291
TEST=`cargo build --features="video-decoder,video-encoder,libvda-stub"`
completes.
TEST=`cargo build --features="video-decoder,video-encoder,libvda"`
reports link errors against libvda.
TEST=`cargo build --features all-x86_64` builds libvda and completes
without error.

Change-Id: I9bb60f6caf670081d67c91275727f3888272d64b
Reviewed-on: https://chromium-review.googlesource.com/c/crosvm/crosvm/+/3947844
Reviewed-by: Dennis Kempin <denniskempin@google.com>
Commit-Queue: Alexandre Courbot <acourbot@chromium.org>
2022-10-21 13:57:31 +00:00
..
src media: libvda: allow to build without linking to libvda 2022-10-21 13:57:31 +00:00
tests
bindgen.sh health-check: enforce blank line after copyright 2022-09-13 22:24:35 +00:00
build.rs Modify builds via CROSVM_BUILD_VARIANT env var 2022-10-04 21:23:00 +00:00
Cargo.toml media: libvda: allow to build without linking to libvda 2022-10-21 13:57:31 +00:00
README.md

README.md

Libvda Rust wrapper

Note: This crate is specific to ChromeOS and requires the native (libvda)[https://source.chromium.org/chromiumos/chromiumos/codesearch/+/main:src/platform2/arc/vm/libvda] library at link time.

Rust wrapper for libvda. This library is used to enable communication with Chrome's GPU process to perform hardware accelerated decoding and encoding. It is currently in development to be used by crosvm's virtio-video device.

Building for the host environment

You can also execute cargo directly for faster build and tests. This would be useful when you are developing this crate. Since this crate depends on libvda.so, you need to install it to host environment first.

(chroot)$ sudo emerge chromeos-base/libvda        # Install libvda.so to host.
# Build
(chroot)$ cargo build
# Unit tests
(chroot)$ cargo test

Updating generated bindings

src/bindings.rs is automatically generated from libvda_common.h. src/decode/bindings.rs is automatically generated from libvda_decode.h. src/encode/bindings.rs is automatically generated from libvda_encode.h.

See the header of the bindings file for the generation command.