AudioBuffer.numberOfChannels
The numberOfChannels
property of the AudioBuffer
interface returns an integer representing the number of discrete audio channels
described by the PCM data stored in the buffer.
Value
An integer.
Examples
// Stereo
var channels = 2;
// Create an empty two second stereo buffer at the
// sample rate of the AudioContext
var frameCount = audioCtx.sampleRate * 2.0;
var myArrayBuffer = audioCtx.createBuffer(2, frameCount, audioCtx.sampleRate);
button.onclick = function() {
// Fill the buffer with white noise;
// just random values between -1.0 and 1.0
for (var channel = 0; channel < channels; channel++) {
// This gives us the actual ArrayBuffer that contains the data
var nowBuffering = myArrayBuffer.getChannelData(channel);
for (var i = 0; i < frameCount; i++) {
// Math.random() is in [0; 1.0]
// audio needs to be in [-1.0; 1.0]
nowBuffering[i] = Math.random() * 2 - 1;
}
}
console.log(myArrayBuffer.numberOfChannels);
}
Specifications
Specification |
---|
Web Audio API # dom-audiobuffer-numberofchannels |
Browser compatibility
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