AudioBuffer: length-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 length-Eigenschaft des AudioBuffer Interfaces gibt eine Ganzzahl zurück, die die Länge der PCM-Daten in Abtastrahmen darstellt, die im Puffer gespeichert sind.

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.length);
};

Spezifikationen

Specification
Web Audio API
# dom-audiobuffer-length

Browser-Kompatibilität

BCD tables only load in the browser

Siehe auch