MediaTrackSettings: autoGainControl property

The MediaTrackSettings dictionary's 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 either getUserMedia() or MediaStreamTrack.applyConstraints().

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.

Value

A Boolean value which is true if the track has automatic gain control enabled or false if AGC is disabled.

Examples

See the Constraint exerciser example.

Specifications

Specification
Media Capture and Streams
# dom-mediatrackconstraintset-autogaincontrol

Browser compatibility

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desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
autoGainControl constraint

Legend

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Full support
Full support
No support
No support
Requires a vendor prefix or different name for use.
Has more compatibility info.

See also