AudioRecorder.js

// src/utils/AudioRecorder.js
export default class AudioRecorder {
  constructor(onAudioChunk) {
    this.onAudioChunk = onAudioChunk; // Float32Array 音声データを受け取るコールバック
    this.mediaRecorder = null;
    this.audioContext = null;
    this.sourceNode = null;
    this.processorNode = null;
  }

  async start() {
    if (!navigator.mediaDevices || !navigator.mediaDevices.getUserMedia) {
      throw new Error("getUserMedia not supported");
    }

    const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
    this.audioContext = new (window.AudioContext || window.webkitAudioContext)();
    this.sourceNode = this.audioContext.createMediaStreamSource(stream);
    this.processorNode = this.audioContext.createScriptProcessor(4096, 1, 1);

    this.sourceNode.connect(this.processorNode);
    this.processorNode.connect(this.audioContext.destination);

    this.processorNode.onaudioprocess = (event) => {
      const inputData = event.inputBuffer.getChannelData(0);
      this.onAudioChunk(inputData);
    };
  }

  stop() {
    if (this.processorNode) {
      this.processorNode.disconnect();
      this.processorNode = null;
    }
    if (this.sourceNode) {
      this.sourceNode.disconnect();
      this.sourceNode = null;
    }
    if (this.audioContext) {
      this.audioContext.close();
      this.audioContext = null;
    }
  }
}