Android. Stream interception

Question

Android

Good evening Habr.
There is an idea for a service for Android - a kind of telephone answering machine.

One of its features should be to redirect audio output (something like cat /dev/audio >>). Tell me which way to dig.

Writing from a microphone (as is done in many answering machines) is not an option, because. the main use cases are just a noisy place or silent mode.

I would be grateful for any information on the topic.

Answer 1

As far as I know, without root in any way.