web api instance property
MediaTrackConstraints: channelCount property
The MediaTrackConstraints dictionary’s
channelCount property is a ConstrainULong
describing the requested or mandatory constraints placed upon the value of the
channelCount constrainable property.
If needed, you can determine whether or not this constraint is supported by checking
the value of channelCount as returned by a
call to getSupportedConstraints(). However, typically this
is unnecessary since browsers will ignore any constraints they’re unfamiliar with.
Value
If this value is a number, the user agent will attempt to obtain media whose channel
count is as close as possible to this number given the capabilities of the hardware and
the other constraints specified. Otherwise, the value of this
ConstrainULong will guide the user agent in its efforts to provide an
exact match to the required channel count (if exact is specified or both
min and max are provided and have the same value) or to a
best-possible value.
The channel count is 1 for monaural sound, 2 for stereo, and so forth.
Examples
See the Constraint exerciser example.