MediaTrackSupportedConstraints: autoGainControl property
The MediaTrackSupportedConstraints
dictionary's autoGainControl
property is a read-only Boolean value which is present (and set to true
) in the object returned by MediaDevices.getSupportedConstraints()
if and only if the user agent supports the autoGainControl
constraint.
If the constraint isn't supported, it's not included in the list, so this value will never be false
.
You can access the supported constraints dictionary by calling navigator.mediaDevices.getSupportedConstraints()
.
The autoGainControl
constraint indicates whether or not the browser offers the ability to automatically control the gain (volume) on media tracks; this obviously is contingent on whether or not the individual device supports automatic gain control as well; it's typically a feature provided by microphones.
Value
This property is present in the dictionary (and its value is always true
) if the user agent supports the autoGainControl
constraint.
If the property isn't present, this property is missing from the supported constraints dictionary, and you'll get undefined
if you try to look at its value.
Examples
This example displays whether or not your browser supports the autoGainControl
constraint.
js
const result = document.getElementById("result");
const supported =
navigator.mediaDevices.getSupportedConstraints().autoGainControl;
result.textContent = supported ? "Supported!" : "Not supported!";
Result
Specifications
Specification |
---|
Media Capture and Streams # dom-mediatracksupportedconstraints-autogaincontrol |
Browser compatibility
BCD tables only load in the browser