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Android Audio Framework Architecture - Bits & Qubits
http://gopinaths.gitlab.io/post/android-audio-framework-architecture/#:~:text=Note%3A%20Android%207.0%20preserves%20support%20for%20using%20audio_policy.conf%3B,in%20device%20makefile.%20Media%20server%20The%20Audio%20Flinger
Android Audio Policy, defined devices and default routing ...
https://stackoverflow.com/questions/63528572/android-audio-policy-defined-devices-and-default-routing
How to change audio device for Android - stm32mpu
https://wiki.st.com/stm32mpu/wiki/How_to_change_audio_device_for_Android
The audio policy manager is required in Android, in charge of making all the audio related decisions (ex: audio output device selection, audio input device selection, audio routing, volume, mute...). A default audio policy manager is implemented within frameworks/av/services/audiopolicy/managerdefault/ .
Audio HAL | Android Open Source Project
https://source.android.com/devices/audio/implement
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