The MediaTrackSettings dictionary's channelCount property is an integer indicating how many audio channel the MediaStreamTrack is currently configured to have. This lets you determine what value was selected to comply with your specified constraints for this property's value as described in the MediaTrackConstraints.channelCount property you provided when calling either getUserMedia() or MediaStreamTrack.applyConstraints().
If needed, you can determine whether or not this constraint is supported by checking the value of MediaTrackSupportedConstraints.channelCount as returned by a call to MediaDevices.getSupportedConstraints(). However, typically this is unnecessary since browsers will simply ignore any constraints they're unfamiliar with.
Syntax
var channelCount = MediaTrackSettings.channelCount;
Value
An integer value indicating the number of audio channels on the track. A value of 1 indicates monaural sound, 2 means stereo, and so forth.
Example
See "Example: Constraint exerciser" in Capabilities, constraints, and settings for an example.
Specifications
| Specification | Status | Comment |
|---|---|---|
| Media Capture and Streams The definition of 'channelCount' in that specification. |
Editor's Draft | Initial specification. |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | (Yes) | No support | No support | (Yes) | ? |
| Feature | Android | Android Webview | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
|---|---|---|---|---|---|---|---|
| Basic support | ? | (Yes) | No support | No support | ? | ? | (Yes) |