web api instance property
MediaTrackSettings: volume property
The MediaTrackSettings dictionary’s volume
property is a double-precision floating-point number indicating the volume of the
MediaStreamTrack as currently configured, as a value from 0.0 (silence)
to 1.0 (maximum supported volume for the device). This lets you determine what value was
selected to comply with your specified constraints for this property’s value as
described in the volume property you provided when
calling either getUserMedia() or
applyConstraints().
If needed, you can determine whether or not this constraint is supported by checking
the value of volume as returned by a call
to getSupportedConstraints(). However, typically this is
unnecessary since browsers will ignore any constraints they’re unfamiliar with.
Value
A double-precision floating-point number indicating the volume, from 0.0 to 1.0, of the audio track as currently configured.
Examples
See the Constraint exerciser example.