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audio-recorder-worklet-processor

v0.0.2

Published

worklet 录音,支持获取 pcm、音量、wav、音频频谱数据

Downloads

26

Readme

audio-recorder-worklet-processor

worklet 录音,支持获取 pcm、音量、wav、音频频谱数据

为了应对不同业务场景,很多情况不需要对音频数据做缓存,如实时转写等,所以这里不对音频数据做存储,仅提供原子能力

如果业务有需求可以自己存储音频数据,再调用这里提供的方法转成 PCM 等格式(也可以自己写转换方法,这里仅提供 PCM 和 WAV 两种)

浏览器支持 charome 66+ Firefox 76+ Edge 79+ Opera 53+ Safari 14.1+

DOC

调用

import Recorder from "audio-recorder-worklet-processor";

const recorder = new Recorder();

<script type="text/javascript" src="../dist/index.js"></script>;

const recorder = new Recorder();

初始化

interface IProcessOptions {
  processSize?: number; //收集采样的大小,采集完多少后触发onDataProcess一次,默认4096
  numChannels?: 1 | 2; //声道数 1或2,默认单声道
  sampleBits?: 16 | 8; //采样位数 一般8,16,默认16
  sampleRate?: number; //采样率 一般 11025、16000、22050、24000、44100、48000,默认为16000
}
interface IAnalyserOptions {
  open: boolean; //是否开启analyserNode,默认否
  fftSize: number; //具体含义可以看mdn的定义,简单来说数值越大精度越高,取值范围32-32768,默认512
}
interface IConfig {
  //录音的实时回调,可以获取音频原始数据和音量区间0-1(觉得不敏感可以自己乘以倍率)
  onDataProcess?: (data: { vol: number; buffer: Float32Array }) => void;
  //process配置
  processOptions: IProcessOptions;
  //analyserNode配置,用来提供实时频率分析和时域分析的切点数据(可以用作数据分析和可视化),默认不开启
  analyserOptions?: IAnalyserOptions;
}

// init(config?: IConfig): Promise<void>
recorder.init(config);

开始录音

//start(): Promise<void>;
recorder.start();

停止收音

//返回录音时长,在调用stop时,会将缓存区不足processSize大小的数据再调用一次onDataProcess返回,所以不用担心丢失录音数据
//stop(): Promise<number | void>;
recorder.stop();

获取音频频谱数据

//getAnalyserData(): Uint8Array
recorder.getAnalyserData();

process 原始数据转 PCM

如果使用这里的录音获取的数据 sampleBits 和 littleEdian 可以不传,如果用这个方法处理其他录音的数据则需要指定一下,否则可能返回数据有问题

  //**
   *
   * @param {Float32Array} bytes  process原数据
   * @param {number} sampleBits  采样位数,默认为init时的参数,未传入则为init默认值
   * @param {boolean} littleEdian  是否是小端字节序,未传入时根据系统自动判断
   * @returns {DataView}  PCM数据
   */
recorder.encodePCM(bytes, sampleBits, littleEdian)

PCM 转 WAV

   //**
    *
    * @param {DataView}  buffer PCM数据
    * @param {Float32Array} sampleRate  采样率,默认为init时的参数,未传入则为init默认值
    * @param {Float32Array} numChannels  声道数,默认为init时的参数,未传入则为init默认值
    * @param {Float32Array} sampleBits  采样位数,默认为init时的参数,未传入则为init默认值
    * @param {boolean} littleEdian  是否是小端字节序,未传入时根据系统自动判断
    * @returns  {DataView}  WAV数据
    */
recorder.encodeWAV(buffer, sampleRate, numChannels, sampleBits, littleEdian)

Example

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <script src="../dist/index.js"></script>
  </head>
  <body>
    <button onclick="init()">init</button>
    <button onclick="start()">start</button>
    <button onclick="analyser()">analyser</button>
    <button onclick="stop()">stop</button>
  </body>
  <script>
    const recorder = new Recorder();
    const bufferArr = [];
    const init = () => {
      recorder.init({
        analyserOptions: {
          open: true,
        },
        onDataProcess: (data) => {
          bufferArr.push(...data.buffer);
        },
      });
    };
    const start = async () => {
      await recorder.start();
    };
    const analyser = () => {
      const data = recorder.getAnalyserData();
      console.log("analyserData:", data);
    };
    const stop = async () => {
      const duration = await recorder.stop();
      console.log("duration:", duration);
      //结束后可以将缓存数据转PCM
      const pcmData = recorder.encodePCM(bufferArr);
      //有需要可以转WAV
      const wavData = recorder.encodeWAV(pcmData);
      //下载等功能自行实现
      const wavBlob = new Blob([wavData], { type: "audio/wav" });
      let oA = document.createElement("a");
      oA.href = window.URL.createObjectURL(wavBlob);
      oA.download = "recorder.wav";
      oA.click();
    };
  </script>
</html>