I have a DSP software which captures the audio playing using the WASAPI api in shared loopback mode.
hr = _pAudioClient->Initialize(AUDCLNT_SHAREMODE_SHARED, AUDCLNT_STREAMFLAGS_LOOPBACK, 0, 0, _pFormat, 0);
This part works fine, but now I want to be able to detect the number of channels actually playing. In other words how would I be able to detect if the audio playing is in stereo, 5.1, 7.1?
The problem is:
* Since loopback have to use shared mode there could be multiple sources playing.
* This analysis has to be done in real-time. Can't wait until playback is done.
* Detect the difference between a channel not used at all by any playback source and a channel that is temporarily silent
The best solution in my mind would be If I could retrieve a list of all playback source/sub mixes and query them each for the number of channels. That way I don't have to analyse the audio data stream itself.