Draft: Add many audio sources (including voice) #5869
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Only enable them if SC_AUDIO_REGULATOR_DEBUG is set, as they may spam the output.
Report the number of silence samples inserted due to underflow every second, along with the other metrics.
The audio regulator assumed a continuous audio stream. But some audio sources (like the "voice call" audio source) do not produce any packets on silence, breaking this assumption. Use PTS to detect such discontinuities. TODO: if PTS values are broken, the detection is also broken.
Store the target audio source integer (one of the constants in android.media.MediaRecorder.AudioSource) in the AudioSource enum (or -1 if not relevant). This will simplify adding new audio sources.
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superseded by #5870.