Expose API for custom audio processing

The library exposes public API for custom Video Filters. It would be good to have a similar thing but for audio. There already is AudioPostProcessEffect which does audio processing but I couldn’t find a way to define my own AudioProcessor.

[pedroSG94]

I tried add audio sink but I can’t listen any difference. For now, I added a class without effect. The idea is similar to gl filter. Use this method to set an effect: https://github.com/pedroSG94/rtmp-rtsp-stream-client-java/blob/master/rtplibrary/src/main/java/com/pedro/rtplibrary/base/Camera1Base.java#L117 You can clear audio effect with this:

rtspCamera1.setCustomAudioEffect(new NoAudioEffect());

To create a new effect you should extend from CustomAudioEffect and modify buffer in process method.

Commit: https://github.com/pedroSG94/rtmp-rtsp-stream-client-java/commit/e3a3731845b7a97b193050ce1c8caa4b1ea745d5

[mzgreen]

Quickly looking at ExoPlayer I found this: https://github.com/google/ExoPlayer/blob/62092e664586175107a3aaac3e1b0efa3059049f/library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java#L709

seems like this class is a default sink that is responsible for managing the buffers and audio processors pipeline, and this method that I pasted above executes AudioProcessor’s methods passing audio buffers into processors and getting the results back.