AudioBuffer: numberOfChannels-Eigenschaft

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2021.

Die numberOfChannels-Eigenschaft des AudioBuffer Interfaces gibt eine Ganzzahl zurück, die die Anzahl der diskreten Audiokanäle beschreibt, die von den im Puffer gespeicherten PCM-Daten beschrieben werden.

Wert

Eine Ganzzahl.

Beispiele

js
// Stereo
const channels = 2;

// Create an empty two second stereo buffer at the
// sample rate of the AudioContext
const frameCount = audioCtx.sampleRate * 2.0;
const myArrayBuffer = audioCtx.createBuffer(2, frameCount, audioCtx.sampleRate);

button.onclick = () => {
  // Fill the buffer with white noise;
  // just random values between -1.0 and 1.0
  for (let channel = 0; channel < channels; channel++) {
    // This gives us the actual ArrayBuffer that contains the data
    const nowBuffering = myArrayBuffer.getChannelData(channel);
    for (let 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);
};

Spezifikationen

Specification
Web Audio API
# dom-audiobuffer-numberofchannels

Browser-Kompatibilität

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
numberOfChannels

Legend

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Full support
Full support

Siehe auch