js主线程从AudioWorkletNode获取样本

// my-worklet-processor.js
class MyWorkletProcessor extends AudioWorkletProcessor {
  process(inputs, outputs, parameters) {
    const input = inputs[0];
    const output = outputs[0];

    // 处理音频数据
    for (let channel = 0; channel < input.length; ++channel) {
      output[channel].set(input[channel]);
    }

    // 获取样本
    const sample = input[0][0]; // 假设我们只处理第一个通道的第一个样本

    return true;
  }
}

registerProcessor('my-worklet-processor', MyWorkletProcessor);

// main.js
async function loadWorklet() {
  await AudioContext.instance().audioWorklet.addModule('my-worklet-processor.js');
}

async function setupAudio() {
  await loadWorklet();

  const audioContext = new AudioContext();
  const source = audioContext.createBufferSource();
  const workletNode = new AudioWorkletNode(audioContext, 'my-worklet-processor');

  source.connect(workletNode);
  workletNode.connect(audioContext.destination);

  // 加载音频文件并播放
  const response = await fetch('path/to/audio/file.mp3');
  const arrayBuffer = await response.arrayBuffer();
  const audioBuffer = await audioContext.decodeAudioData(arrayBuffer);
  source.buffer = audioBuffer;
  source.start();
}

setupAudio();