AudioWorkletでレコーダーを作る - Qiita

export default class RecorderNode extends AudioWorkletNode { constructor(audioCtx){ super(audioCtx, 'recorder-processor'); this.buffers = []; //processorから受け取ったFloat32Arrayを貯める this.port.onmessage = e => this.buffers.push(e.data); } //Float32Arrayの配列を繋げて新しいFloat32Arrayを返す mergeBuffers(buffers){ const sampleLength = buffers.reduce((acc, buf) => acc + buf.length, 0); const array = new Float32Array(s