Web/API/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.
Syntax
autoGainSupported = supportedConstraintsDictionary.autoGainControl;
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.
Example
This example simply displays whether or not your browser supports the autoGainControl
constraint.
HTML content
<div id="result">
</div>
CSS content
#result {
font: 14px "Arial", sans-serif;
}
JavaScript content
let result = document.getElementById("result");
if (navigator.mediaDevices.getSupportedConstraints().autoGainControl) {
result.innerHTML = "Supported!";
} else {
result.innerHTML = "Not supported!";
}
Result
Specifications
Specification | Status | Comment |
---|---|---|
Media Capture and StreamsThe definition of 'autoGainControl' in that specification. | Candidate Recommendation | Initial specification. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
autoGainControl
|
Chrome
Full support 69 |
Edge
Full support ≤79 |
Firefox Full support 55 Full support 55 No support ? — 55 Prefixed' Implemented with the vendor prefix: moz |
IE
No support No |
Opera
Full support Yes |
Safari
? |
WebView Android
Full support 69 |
Chrome Android
Full support 69 |
Firefox Android Full support 55 Full support 55 No support ? — 55 Prefixed' Implemented with the vendor prefix: moz |
Opera Android
Full support Yes |
Safari iOS
? |
Samsung Internet Android
Full support 10.0 |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- Requires a vendor prefix or different name for use.'
- Requires a vendor prefix or different name for use.
See also
- Media Capture and Streams API
MediaDevices.getSupportedConstraints()
MediaTrackSupportedConstraints
MediaStreamTrack
MediaTrackSupportedConstraints.autoGainControl by Mozilla Contributors is licensed under CC-BY-SA 2.5.