I'm decoding an online AAC stream with MediaCodec and trying to play it with AudioTrack. AudioTrack requires an AudioFormat which requires knowing the details of PCM encoding. I was able to get the audio to play correctly by configuring it as ENCODING_PCM_16BIT but is that guaranteed to always be 16-bit PCM encoding? I want to avoid making that assumption.
I would expect MediaCodec.Callback.onOutputFormatChanged to get the encoding information as part of it's MediaFormat parameter, which seems like it should be the case by this https://stackoverflow.com/a/49812393/2399236, but this is all the information I get out of the media format by calling toString() on it:
aac-drc-heavy-compression=1
sample-rate=48000
aac-drc-boost-level=127
aac-drc-output-loudness=-1
mime=audio/raw
channel-count=2
aac-drc-effect-type=3
aac-drc-cut-level=127
aac-encoded-target-level=-1
aac-max-output-channel_count=8
aac-target-ref-level=64
aac-drc-album-mode=0
Should I just assume that it's 16-bit PCM, or is there any way to get that information?
Note: I'm targetting min SDK 28, currently testing in debugger on emulated Pixel 2 API 30.