How avoid automatic gain control with AudioRecord?

Question

How can I do audio recordings using android.media.AudioRecord without any smartphone-manufacturer-dependent fancy signal processing like automatic gain control

Answer 1

Some devices add AGC effect to the sound input tract by default. Therefore, you need to obtain reference to corresponding AudioEffect object and force it to disable.

First, obtain AutomaticGainControl object linked to the AudioRecord audio session, and then just set it disabled:

if (AutomaticGainControl.isAvailable()) {
    AutomaticGainControl agc = AutomaticGainControl.create(
            myAudioRecord.getAudioSessionId()
        );
    agc.setEnabled(false);
}