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libopus-Android.mk

Android NDK configuration to build opus as shared library.

How to

  1. Clone the opus source code from github (e.g. next to you build.gradle to a folder named libopus), using your target opus version (e.g. 1.5.2): git clone --branch=v1.5.2 https://github.com/xiph/opus libopus
  2. Place the convert_android_asm.sh from this repo into the opus root folder and run it from there: ./convert_android_asm.sh
  3. Place the Android.mk somewhere (e.g. next to your build.gradle), edit the LOCAL_OPUS_VERSION to match your version number and let LOCAL_PATH point to the opus root folder.
  4. Enable the native build instructions in gradle: Add this to the android section of your build.gradle file: 
    externalNativeBuild {
    ndkBuild{
        path "Android.mk"
    }
}
    Keep in mind that you may need to edit the path if you placed the Android.mk somewhere else in step 3.

About the Android.mk

The Android.mk is based on the Android.bp from the Android OpenSource Project. Currently, opus 1.5.2 is targeted. Also, arm neon optimizations are always on, since

The OS has been neon-only for many years now