The Opus Extension is a Renderer implementation that helps you bundle libopus (the Opus decoding library) into your app and use it along with ExoPlayer to play Opus audio on Android devices.

• Checkout ExoPlayer along with Extensions:

git clone https://github.com/google/ExoPlayer.git

• Set the following environment variables:

cd "<path to exoplayer checkout>"
EXOPLAYER_ROOT="$(pwd)"
OPUS_EXT_PATH="${EXOPLAYER_ROOT}/extensions/opus/src/main"

• Download the Android NDK and set its location in an environment variable:

NDK_PATH="<path to Android NDK>"

• Fetch libopus:

cd "${OPUS_EXT_PATH}/jni" && \
git clone https://git.xiph.org/opus.git libopus

• Run the script to convert arm assembly to NDK compatible format:

cd ${OPUS_EXT_PATH}/jni && ./convert_android_asm.sh

• Build the JNI native libraries from the command line:

cd "${OPUS_EXT_PATH}"/jni && \
${NDK_PATH}/ndk-build APP_ABI=all -j4

• In your project, you can add a dependency to the Opus Extension by using a rule like this:

// in settings.gradle
include ':..:ExoPlayer:library'
include ':..:ExoPlayer:extension-opus'

// in build.gradle
dependencies {
    compile project(':..:ExoPlayer:library')
    compile project(':..:ExoPlayer:extension-opus')
}

• Now, when you build your app, the Opus extension will be built and the native libraries will be packaged along with the APK.

• Every time there is a change to the libopus checkout:
  • Arm assembly should be converted by running convert_android_asm.sh
  • Clean and re-build the project.
• If you want to use your own version of libopus, place it in ${OPUS_EXT_PATH}/jni/libopus.