autoGainControl property is a Boolean value whose value
indicates whether or not automatic gain control (AGC) is enabled on an audio track. This
lets you determine what value was selected to comply with your specified constraints for
this property's value as described in the
MediaTrackConstraints.autoGainControl property you provided when calling
Automatic gain control is a feature in which a sound source automatically manages changes in the volume of its source media to maintain a steady overall volume level. This feature is typically used on microphones, although it can be provided by other input sources as well.
If needed, you can determine whether or not this constraint is supported by checking
the value of
MediaTrackSupportedConstraints.autoGainControl as returned
by a call to
MediaDevices.getSupportedConstraints(). However, typically
this is unnecessary since browsers will ignore any constraints they're unfamiliar with.
var autoGainControl = MediaTrackSettings.autoGainControl;
A Boolean value which is
true if the track has automatic gain control
false if AGC is disabled.
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