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MediaTrackSupportedConstraints: channelCount property - Web APIs | MDN
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MediaTrackSupportedConstraints: channelCount property
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
The MediaTrackSupportedConstraints dictionary's
channelCount 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 channelCount 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().
Value
This property is present in the dictionary (and its value is always true)
if the user agent supports the channelCount 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
<div id="result"></div>
#result {
font:
14px "Arial",
sans-serif;
}
js
const result = document.getElementById("result");
const supported = navigator.mediaDevices.getSupportedConstraints().channelCount;
result.textContent = supported ? "Supported!" : "Not supported!";
Result
Specifications
| Specification |
|---|
| Media Capture and Streams # dom-mediatrackconstraintset-channelcount |
Browser compatibility
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