The AV1 extension provides Libgav1VideoRenderer
, which uses libgav1 native library to decode AV1 videos.
Please note that whilst the code in this repository is licensed under Apache 2.0, using this extension also requires building and including one or more external libraries as described below. These are licensed separately.
To use this extension you need to clone the ExoPlayer repository and depend on its modules locally. Instructions for doing this can be found in ExoPlayer's top level README.
In addition, it's necessary to fetch cpu_features library and libgav1 with its dependencies as follows:
cd "<path to exoplayer checkout>" EXOPLAYER_ROOT="$(pwd)" AV1_EXT_PATH="${EXOPLAYER_ROOT}/extensions/av1/src/main"
cd "${AV1_EXT_PATH}/jni" && \ git clone https://github.com/google/cpu_features
cd "${AV1_EXT_PATH}/jni" && \ git clone https://chromium.googlesource.com/codecs/libgav1 libgav1
cd "${AV1_EXT_PATH}/jni/libgav1" && \ git clone https://github.com/abseil/abseil-cpp.git third_party/abseil-cpp
Having followed these steps, gradle will build the extension automatically when run on the command line or via Android Studio, using CMake and Ninja to configure and build libgav1 and the extension's JNI wrapper library.
We do not provide support for building this extension on Windows, however it should be possible to follow the Linux instructions in Windows PowerShell.
Once you‘ve followed the instructions above to check out, build and depend on the extension, the next step is to tell ExoPlayer to use Libgav1VideoRenderer
. How you do this depends on which player API you’re using:
DefaultRenderersFactory
to SimpleExoPlayer.Builder
, you can enable using the extension by setting the extensionRendererMode
parameter of the DefaultRenderersFactory
constructor to EXTENSION_RENDERER_MODE_ON
. This will use Libgav1VideoRenderer
for playback if MediaCodecVideoRenderer
doesn’t support decoding the input AV1 stream. Pass EXTENSION_RENDERER_MODE_PREFER
to give Libgav1VideoRenderer
priority over MediaCodecVideoRenderer
.DefaultRenderersFactory
, add a Libvgav1VideoRenderer
to the output list in buildVideoRenderers
. ExoPlayer will use the first Renderer
in the list that supports the input media format.RenderersFactory
, return a Libgav1VideoRenderer
instance from createRenderers
. ExoPlayer will use the first Renderer
in the returned array that supports the input media format.ExoPlayer.Builder
, pass a Libgav1VideoRenderer
in the array of Renderer
s. ExoPlayer will use the first Renderer
in the list that supports the input media format.Note: These instructions assume you're using DefaultTrackSelector
. If you have a custom track selector the choice of Renderer
is up to your implementation. You need to make sure you are passing a Libgav1VideoRenderer
to the player and then you need to implement your own logic to use the renderer for a given track.
To try out playback using the extension in the demo application, see enabling extension decoders.
There are two possibilities for rendering the output Libgav1VideoRenderer
gets from the libgav1 decoder:
GL rendering using GL shader for color space conversion
SimpleExoPlayer
with PlayerView
, enable this option by setting surface_type
of PlayerView
to be video_decoder_gl_surface_view
.Libgav1VideoRenderer
a message of type C.MSG_SET_VIDEO_DECODER_OUTPUT_BUFFER_RENDERER
with an instance of VideoDecoderOutputBufferRenderer
as its object.Native rendering using ANativeWindow
SimpleExoPlayer
with PlayerView
, this option is enabled by default.Libgav1VideoRenderer
a message of type C.MSG_SET_SURFACE
with an instance of SurfaceView
as its object.Note: Although the default option uses ANativeWindow
, based on our testing the GL rendering mode has better performance, so should be preferred
com.google.android.exoplayer2.ext.av1.*
belong to this module.