【前端】vue+recorder实现录音功能

重要的事情说三遍：要在https下才能实现！ 要在https下才能实现！！ 要在https下才能实现！！！
我当时就是忽略了这个点折腾了很久，最后根据这篇文章：Vue.js实战——封装浏览器录音组件_6，实现了录音功能。
因为本地是http，不能看到效果，建议使用【whistle】强大的web调试代理工具来进行代理本地，随时查看修改的效果

因为原文章不能抛出录音失败的错误，所以在此基础修改下

//recorder.js
export default class Recorder {
  constructor(stream, config) {
    //兼容
    window.URL = window.URL || window.webkitURL;
    navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;

    config = config || {};
    config.sampleBits = config.sampleBits || 16;   //采样数位 8, 16
    config.sampleRate = config.sampleRate || 8000; //采样率(1/6 44100)

    this.context = new (window.webkitAudioContext || window.AudioContext)();
    this.audioInput = this.context.createMediaStreamSource(stream);
    this.createScript = this.context.createScriptProcessor || this.context.createJavaScriptNode;
    this.recorder = this.createScript.apply(this.context, [4096, 1, 1]);

    this.audioData = {
      size: 0,          //录音文件长度
      buffer: [],    //录音缓存
      inputSampleRate: this.context.sampleRate,   //输入采样率
      inputSampleBits: 16,     //输入采样数位 8, 16
      outputSampleRate: config.sampleRate,   //输出采样率
      oututSampleBits: config.sampleBits,       //输出采样数位 8, 16
      input: function (data) {
        this.buffer.push(new Float32Array(data));
        this.size += data.length;
      },
      compress: function () { //合并压缩
        //合并
        let data = new Float32Array(this.size);
        let offset = 0;
        for (let i = 0; i < this.buffer.length; i++) {
          data.set(this.buffer[i], offset);
          offset += this.buffer[i].length;
        }
        //压缩
        let compression = parseInt(this.inputSampleRate / this.outputSampleRate);
        let length = data.length / compression;
        let result = new Float32Array(length);
        let index = 0, j = 0;
        while (index < length) {
          result[index] = data[j];
          j += compression;
          index++;
        }
        return result;
      },
      encodeWAV: function () {
        let sampleRate = Math.min(this.inputSampleRate, this.outputSampleRate);
        let sampleBits = Math.min(this.inputSampleBits, this.oututSampleBits);
        let bytes = this.compress();
        let dataLength = bytes.length * (sampleBits / 8);
        let buffer = new ArrayBuffer(44 + dataLength);
        let data = new DataView(buffer);

        let channelCount = 1;//单声道
        let offset = 0;

        let writeString = function (str) {
          for (let i = 0; i < str.length; i++) {
            data.setUint8(offset + i, str.charCodeAt(i));
          }
        };

        // 资源交换文件标识符
        writeString('RIFF');
        offset += 4;
        // 下个地址开始到文件尾总字节数,即文件大小-8
        data.setUint32(offset, 36 + dataLength, true);
        offset += 4;
        // WAV文件标志
        writeString('WAVE');
        offset += 4;
        // 波形格式标志
        writeString('fmt ');
        offset += 4;
        // 过滤字节,一般为 0x10 = 16
        data.setUint32(offset, 16, true);
        offset += 4;
        // 格式类别 (PCM形式采样数据)
        data.setUint16(offset, 1, true);
        offset += 2;
        // 通道数
        data.setUint16(offset, channelCount, true);
        offset += 2;
        // 采样率,每秒样本数,表示每个通道的播放速度
        data.setUint32(offset, sampleRate, true);
        offset += 4;
        // 波形数据传输率 (每秒平均字节数) 单声道×每秒数据位数×每样本数据位/8
        data.setUint32(offset, channelCount * sampleRate * (sampleBits / 8), true);
        offset += 4;
        // 快数据调整数 采样一次占用字节数 单声道×每样本的数据位数/8
        data.setUint16(offset, channelCount * (sampleBits / 8), true);
        offset += 2;
        // 每样本数据位数
        data.setUint16(offset, sampleBits, true);
        offset += 2;
        // 数据标识符
        writeString('data');
        offset += 4;
        // 采样数据总数,即数据总大小-44
        data.setUint32(offset, dataLength, true);
        offset += 4;
        // 写入采样数据
        if (sampleBits === 8) {
          for (let i = 0; i < bytes.length; i++ , offset++) {
            let s = Math.max(-1, Math.min(1, bytes[i]));
            let val = s < 0 ? s * 0x8000 : s * 0x7FFF;
            val = parseInt(255 / (65535 / (val + 32768)));
            data.setInt8(offset, val, true);
          }
        } else {
          for (let i = 0; i < bytes.length; i++ , offset += 2) {
            let s = Math.max(-1, Math.min(1, bytes[i]));
            data.setInt16(offset, s < 0 ? s * 0x8000 : s * 0x7FFF, true);
          }
        }
        return new Blob([data], { type: 'audio/wav' });
      }
    };
  }

  //开始录音
  start () {
    this.audioInput.connect(this.recorder);
    this.recorder.connect(this.context.destination);

    //音频采集
    let self = this;
    this.recorder.onaudioprocess = function (e) {
      self.audioData.input(e.inputBuffer.getChannelData(0));
    };
  };

  //停止
  stop () {
    this.recorder.disconnect();
  };

  //获取音频文件
  getBlob () {
    this.stop();
    return this.audioData.encodeWAV();
  };

  //回放
  play (audio) {
    audio.src = window.URL.createObjectURL(this.getBlob());
  };

  //清理缓存的录音数据
  clear (audio) {
    this.audioData.buffer = [];
    this.audioData.size = 0;
    audio.src = ''
  };

  static checkError (e) {
    const { name } = e;
    let errorMsg = ''
    switch (name) {
      case 'AbortError': errorMsg = '录音设备无法被使用'; break;
      case 'NotAllowedError': errorMsg = '用户已禁止网页调用录音设备'; break;
      case 'PermissionDeniedError': errorMsg = '用户已禁止网页调用录音设备'; break;     // 用户拒绝
      case 'NotFoundError': errorMsg = '录音设备未找到'; break;
      case 'DevicesNotFoundError': errorMsg = '录音设备未找到'; break;
      case 'NotReadableError': errorMsg = '录音设备无法使用'; break;
      case 'NotSupportedError': errorMsg = '不支持录音功能'; break;
      case 'MandatoryUnsatisfiedError': errorMsg = '无法发现指定的硬件设备'; break;
      default: errorMsg = '录音调用错误'; break;
    }
    return { error: errorMsg }
  };

  static get (callback, config) {
    if (callback) {
      if (navigator.mediaDevices && navigator.mediaDevices.getUserMedia) {
        navigator.mediaDevices.getUserMedia({ audio: true, video: false }).then((stream) => {
          let rec = new Recorder(stream, config);
          callback(rec);
        }).catch((e) => {
          callback(Recorder.checkError(e));
        })
      } else {
        navigator.getUserMedia({ audio: true, video: false }).then((stream) => {
          let rec = new Recorder(stream, config);
          callback(rec);
        }).catch((e) => {
          // Recorder.checkError(e)
          callback(Recorder.checkError(e));
        })
      }
    }
  };
}

//record-sdk.js
import Recorder from "./recorder";
export default class Record {
  startRecord (param) {
    let self = this;
    try {
      Recorder.get(rec => {
        if (rec.error) return param.error(rec.error);
        self.recorder = rec;
        self.recorder.start();
        param.success("开始录音");
      })
    } catch (e) {
      param.error("开始录音失败" + e);
    }
  }

  stopRecord (param) {
    let self = this;
    try {
      let blobData = self.recorder.getBlob();
      param.success(blobData);
    } catch (e) {
      param.error("结束录音失败" + e);
    }
  }

  play (audio) {
    let self = this;
    try {
      self.recorder.play(audio);
    } catch (e) {
      console.error("录音播放失败" + e);
    }
  }

  clear (audio) {
    let self = this;
    try {
      self.recorder.clear(audio);
    } catch (e) {
      console.error("清空录音失败" + e);
    }
  }
}

//voice.vue
...
  <div class="record">
      <h1>{{tipMsg}}</h1>
      <button @click="onStartVoice">开始</button>
      <button @click="onEndVoice">结束</button>
      <button @click="onPlayAudio">播放</button>
      <div class="record-play"
           v-show="isFinished">
        <h2>Current voice player is:</h2>
        <audio id="audioVoice"
               controls
               autoplay></audio>
      </div>
    </div>
...
<script>
import Record from '@/plugins/recorder/record-sdk';
export default {
  data () {
    return {
      isVoice: false,
      isFinished: false,
      tipMsg: '录音',
      audio: "",
      recorder: new Record()
    }
  },
 methods: {
     // 开始录音
    onStartVoice () {
      this.onStopAudio()
      this.isFinished = false;
      this.recorder.startRecord({
        success: res => {
          this.isVoice = true
        },
        error: e => {
          this.isVoice = false
          this.$toast(e)
        }
      });
    },

    // 结束录音
    onEndVoice () {
      this.isFinished = false;
      this.recorder.stopRecord({
        success: res => {
          this.isVoice = false
          //此处可以获取音频源文件(res)，用于上传等操作
          console.log('音频源文件', res)
        },
        error: e => {
          this.isVoice = false
        }
      });
    },

    // 播放录音
    onPlayAudio () {
      this.isVoice = false
      this.isFinished = true;
      this.audio = document.getElementById("audioVoice");
      this.recorder.play(this.audio);
    },

    // 停止播放录音
    onStopAudio () {
      this.recorder.clear(this.audio);
    }
  }
}
</script>

因为项目可能要实现语音录菜功能，便提前看下h5是否可以录音，如果后期真要实现语音录菜功能,，再来更新