The AAC decoder: a long-lived ffmpeg child whose output is cut back into frames.
The output rate and the callbacks.
The ffmpeg binary.
Optional
Starts the process (tests pass a fake).
Writes one AAC frame.
Ends the decoder; no failure is reported for it.
Discards the PCM of every frame written so far as it comes out.
The AAC decoder: a long-lived ffmpeg child whose output is cut back into frames.