MediaTrackSupportedConstraints.autoGainControl
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.
let result = document.getElementById("result");
if (navigator.mediaDevices.getSupportedConstraints().autoGainControl) {
result.textContent = "Supported!";
} else {
result.textContent = "Not supported!";
}
Result
Specifications
Specification |
---|
Media Capture and Streams # dom-mediatracksupportedconstraints-autogaincontrol |
Browser compatibility
BCD tables only load in the browser