Why does AnalogAudioStream for ESP32-S3 require an input from two ADC channels and not one?

[candorgander]

When using ESP32-S3 with Arduino-ESP32 V3.0.0Alphav2 and AnalogAudioStream, the AnalogConfigESP32V1.h header is used when compiling the sketch. Why does the input have to be two channels of the ADC and not one? Have I skipped over some documentation or is this a TODO?

[pschatzmann]

What makes you think that it has to be 2?
You can set channels=1

[candorgander]

Hmm, I can set that.

What confused me is that, in AnalogConfigESP32V1, adc_channels [2] is an array of two channels & they are declared in AnalogConfigESP32V1.h header file. This would require me to provide two channels, one, the ADC channel that I am using and another as a placeholder. Am I right?

[pschatzmann]

Right, if you set one channel, only the first element is relevant: The second is ignored

[candorgander]

Right. I will follow that. Would it not make it easier if the functions of AnalogAudioStream is the same over different version of ESP32 core? Is there are reason for the difference?

[pschatzmann]

Espessif made a new api that was not available before and it is a he'll of complicated!