https://www.yotutor.ai/audio-worklet-processor.js

1/**
2 * Audio Worklet Processor for PCM Audio Capture
3 * Captures microphone audio and converts to PCM format for WebSocket transmission
4 */
5
6class PCMProcessor extends AudioWorkletProcessor {
7  constructor() {
8    super();
9    this.bufferSize = 4096;
10    this.buffer = new Float32Array(this.bufferSize);
11    this.bufferIndex = 0;
12  }
13
14  process(inputs, outputs, parameters) {
15    const input = inputs[0];
16    
17    if (input.length > 0) {
18      const inputChannel = input[0];
19      
20      for (let i = 0; i < inputChannel.length; i++) {
21        this.buffer[this.bufferIndex++] = inputChannel[i];
22        
23        // When buffer is full, send it to main thread
24        if (this.bufferIndex >= this.bufferSize) {
25          this.port.postMessage(this.buffer.slice(0, this.bufferIndex));
26          this.bufferIndex = 0;
27        }
28      }
29    }
30    
31    return true; // Keep processor alive
32  }
33}
34
35registerProcessor('pcm-processor', PCMProcessor);