<template>
  <div class="home" style="margin: 1vw">
    <Button type="success" @click="getPermission()" style="margin: 1vw"
      >获取麦克风权限</Button
    >
    <br />
    <Button type="info" @click="startRecorder()" style="margin: 1vw"
      >开始录音</Button
    >
    <Button type="info" @click="resumeRecorder()" style="margin: 1vw"
      >继续录音</Button
    >
    <Button type="info" @click="pauseRecorder()" style="margin: 1vw"
      >暂停录音</Button
    >
    <Button type="info" @click="stopRecorder()" style="margin: 1vw"
      >结束录音</Button
    >
    <br />
    <Button type="success" @click="playRecorder()" style="margin: 1vw"
      >录音播放</Button
    >
    <Button type="success" @click="pausePlayRecorder()" style="margin: 1vw"
      >暂停录音播放</Button
    >
    <Button type="success" @click="resumePlayRecorder()" style="margin: 1vw"
      >恢复录音播放</Button
    >
    <Button type="success" @click="stopPlayRecorder()" style="margin: 1vw"
      >停止录音播放</Button
    >
    <br />
    <Button type="info" @click="getRecorder()" style="margin: 1vw"
      >获取录音信息</Button
    >
    <Button type="info" @click="downPCM()" style="margin: 1vw">下载PCM</Button>
    <Button type="info" @click="downWAV()" style="margin: 1vw">下载WAV</Button>
    <Button type="info" @click="getMp3Data()" style="margin: 1vw"
      >下载MP3</Button
    >
    <br />
    <Button type="error" @click="destroyRecorder()" style="margin: 1vw"
      >销毁录音</Button
    >
  </div>
</template>

 
<script>
import Recorder from "js-audio-recorder";

const lamejs = require("lamejs");

const recorder = new Recorder({
  sampleBits: 16, // 采样位数，支持 8 或 16，默认是16
  sampleRate: 48000, // 采样率，支持 11025、16000、22050、24000、44100、48000，根据浏览器默认值，我的chrome是48000
  numChannels: 1, // 声道，支持 1 或 2， 默认是1
  // compiling: false,(0.x版本中生效,1.x增加中) // 是否边录边转换，默认是false
});

// 绑定事件-打印的是当前录音数据

recorder.onprogress = function (params) {
  // console.log('--------------START---------------')
  // console.log('录音时长(秒)', params.duration);
  // console.log('录音大小(字节)', params.fileSize);
  // console.log('录音音量百分比(%)', params.vol);
  // console.log('当前录音的总数据([DataView, DataView...])', params.data);
  // console.log('--------------END---------------')
};

export default {
  name: "home",
  methods: {
    /**
     * 录音的具体操作功能
     * */

    // 开始录音
    startRecorder() {
      recorder.start().then(
        () => {
        },
        (error) => {
          // 出错了
          console.log(`${error.name} : ${error.message}`);
        }
      );
    },

    // 继续录音
    resumeRecorder() {
      recorder.resume();
    },
    // 暂停录音
    pauseRecorder() {
      recorder.pause();
    },
    // 结束录音
    stopRecorder() {
      recorder.stop();
    },

    // 录音播放
    playRecorder() {
      recorder.play();
    },

    // 暂停录音播放
    pausePlayRecorder() {
      recorder.pausePlay();
    },

    // 恢复录音播放
    resumePlayRecorder() {
      recorder.resumePlay();
    },

    // 停止录音播放
    stopPlayRecorder() {
      recorder.stopPlay();
    },

    // 销毁录音
    destroyRecorder() {
      recorder.destroy();
      //   .then(function () {
      // recorder = null;
      //   });
    },

    /**
     * 获取录音文件
     * */

    getRecorder() {
      let toltime = recorder.duration; //录音总时长
      let fileSize = recorder.fileSize; //录音总大小
      //录音结束，获取取录音数据
      let PCMBlob = recorder.getPCMBlob(); //获取 PCM 数据
      let wav = recorder.getWAVBlob(); //获取 WAV 数据
      let channel = recorder.getChannelData(); //获取左声道和右声道音频数据
      console.log(toltime);
    //   debugger;
    },

    /**
     * 下载录音文件
     * */

    //下载pcm

    downPCM() {
      //这里传参进去的时文件名
      recorder.downloadPCM("新文件");
    },

    //下载wav

    downWAV() {
      //这里传参进去的时文件名
      recorder.downloadWAV("新文件");
    },

    /**
     * 获取麦克风权限
     * */

    getPermission() {
      Recorder.getPermission().then(
        () => {
          this.$Message.success("获取权限成功");
        },
        (error) => {
          console.log(`${error.name} : ${error.message}`);
        }
      );
    },

    /**
     * 文件格式转换 wav-map3
     * */

    getMp3Data() {
      const mp3Blob = this.convertToMp3(recorder.getWAV());
      recorder.download(mp3Blob, "recorder", "mp3");
    },

    convertToMp3(wavDataView) {
      // 获取wav头信息
      const wav = lamejs.WavHeader.readHeader(wavDataView); // 此处其实可以不用去读wav头信息，毕竟有对应的config配置
      const { channels, sampleRate } = wav;
      const mp3enc = new lamejs.Mp3Encoder(channels, sampleRate, 128);
      // 获取左右通道数据
      const result = recorder.getChannelData();
      const buffer = [];
      const leftData =
        result.left &&
        new Int16Array(result.left.buffer, 0, result.left.byteLength / 2);
      const rightData =
        result.right &&
        new Int16Array(result.right.buffer, 0, result.right.byteLength / 2);
      const remaining = leftData.length + (rightData ? rightData.length : 0);
      const maxSamples = 1152;
      for (let i = 0; i < remaining; i += maxSamples) {
        const left = leftData.subarray(i, i + maxSamples);
        let right = null;
        let mp3buf = null;
        if (channels === 2) {
          right = rightData.subarray(i, i + maxSamples);
          mp3buf = mp3enc.encodeBuffer(left, right);
        } else {
          mp3buf = mp3enc.encodeBuffer(left);
        }
        if (mp3buf.length > 0) {
          buffer.push(mp3buf);
        }
      }

      const enc = mp3enc.flush();
      if (enc.length > 0) {
        buffer.push(enc);
      }
      return new Blob(buffer, { type: "audio/mp3" });
    },
  },
};
</script>

 
<style  scoped>
</style>