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The MediaTrackConstraints dictionary's autoGainControl property is a ConstrainBoolean describing the requested or mandatory constraints placed upon the value of the autoGainControl constrainable property.

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 simply ignore any constraints they're unfamiliar with.

Automatic gain control is typically a feature provided by microphones, although it can be provided by other input sources as well.


var constraintsObject = { autoGainControl: constraint };

constraintsObject.autoGainControl = constraint;


If this value is a simple true or false, the user agent will attempt to obtain media with automatic gain control enabled or disabled as specified, if possible, but will not fail if this can't be done. If, instead, the value is given as an object with an exact field, that field's Boolean value indicates a required setting for the automatic gain control feature; if it can't be met, then the request will result in an error.


See "Example: Constraint exerciser" in Capabilities, constraints, and settings for an example.


Specification Status Comment
Media Capture and Streams
The definition of 'autoGainControl' in that specification.
Editor's Draft Initial specification.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) mozAutoGainControl 46 (46)
autoGainControl 55 (55)
No support (Yes) ?
Feature Android Android Webview Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support ? (Yes) mozAutoGainControl 46.0 (46)
autoGainControl 55.0 (55)
No support ? ? (Yes)

See also

Document Tags and Contributors

 Contributors to this page: Sheppy
 Last updated by: Sheppy,