HTML5声音录制/播放功能的实现代码

互联网 18-5-5

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html代码：

<!DOCTYPE html>  <html>      <head>          <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />          <title>火星黑洞</title>      </head>      <body>          <p>              <audio autoplay></audio>              <input onclick="startRecording()" type="button" value="录音" />              <input onclick="stopRecording()" type="button" value="停止" />              <input onclick="playRecording()" type="button" value="播放" />              <input onclick="uploadAudio()" type="button" value="提交" />              <br />              <p id="recordingslist"></p>          </p>          <script type="text/javascript" src="js/HZRecorder.js"></script>          <script>              var recorder;              var audio = document.querySelector('audio');              function startRecording() {                  HZRecorder.get(function(rec) {                      recorder = rec;                      recorder.start();                  }, {                      sampleBits: 16,                      sampleRate: 16000                  });              }              function stopRecording() {                  recorder.stop();                  var blob = recorder.getBlob();                  var url = URL.createObjectURL(blob);                  var p = document.createElement('p');                  var au = document.createElement('audio');                  var hf = document.createElement('a');                  au.controls = true;                  au.src = url;                  hf.href = url;                  hf.download = new Date().toISOString() + '.wav';                  hf.innerHTML = hf.download;                  p.appendChild(au);                  p.appendChild(hf);                  recordingslist.appendChild(p);              }              function playRecording() {                  recorder.play(audio);              }              function uploadAudio() {                  recorder.upload("Handler1.ashx", function(state, e) {                      switch(state) {                          case 'uploading':                              //var percentComplete = Math.round(e.loaded * 100 / e.total) + '%';                              break;                          case 'ok':                              //alert(e.target.responseText);                              alert("上传成功");                              break;                          case 'error':                              alert("上传失败");                              break;                          case 'cancel':                              alert("上传被取消");                              break;                      }                  });              }          </script>      </body>  </html>

HZRecorder.js

(function (window) {      //兼容      window.URL = window.URL || window.webkitURL;      navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;      var HZRecorder = function (stream, config) {          config = config || {};          config.sampleBits = config.sampleBits || 8      //采样数位 8, 16          config.sampleRate = config.sampleRate || (44100 / 6);   //采样率(1/6 44100)          var context = new (window.webkitAudioContext || window.AudioContext)();          var audioInput = context.createMediaStreamSource(stream);          var createScript = context.createScriptProcessor || context.createJavaScriptNode;          var recorder = createScript.apply(context, [4096, 1, 1]);          var mp3ReceiveSuccess, currentErrorCallback;          var audioData = {              size: 0          //录音文件长度              , buffer: []     //录音缓存              , inputSampleRate: 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                  var data = new Float32Array(this.size);                  var offset = 0;                  for (var i = 0; i < this.buffer.length; i++) {                      data.set(this.buffer[i], offset);                      offset += this.buffer[i].length;                  }                  //压缩                  var compression = parseInt(this.inputSampleRate / this.outputSampleRate);                  var length = data.length / compression;                  var result = new Float32Array(length);                  var index = 0, j = 0;                  while (index < length) {                      result[index] = data[j];                      j += compression;                      index++;                  }                  return result;              }              , encodeWAV: function () {                  var sampleRate = Math.min(this.inputSampleRate, this.outputSampleRate);                  var sampleBits = Math.min(this.inputSampleBits, this.oututSampleBits);                  var bytes = this.compress();                  var dataLength = bytes.length * (sampleBits / 8);                  var buffer = new ArrayBuffer(44 + dataLength);                  var data = new DataView(buffer);                  var channelCount = 1;//单声道                  var offset = 0;                  var writeString = function (str) {                      for (var 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 (var i = 0; i < bytes.length; i++, offset++) {                          var s = Math.max(-1, Math.min(1, bytes[i]));                          var val = s < 0 ? s * 0x8000 : s * 0x7FFF;                          val = parseInt(255 / (65535 / (val + 32768)));                          data.setInt8(offset, val, true);                      }                  } else {                      for (var i = 0; i < bytes.length; i++, offset += 2) {                          var 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          this.start = function () {              audioInput.connect(recorder);              recorder.connect(context.destination);          }          //停止          this.stop = function () {              recorder.disconnect();          }          //获取音频文件          this.getBlob = function () {              this.stop();              return audioData.encodeWAV();          }          //回放          this.play = function (audio) {              audio.src = window.URL.createObjectURL(this.getBlob());          }          //上传          this.upload = function (url, callback) {              var fd = new FormData();              fd.append("audioData", this.getBlob());              var xhr = new XMLHttpRequest();              if (callback) {                  xhr.upload.addEventListener("progress", function (e) {                      callback('uploading', e);                  }, false);                  xhr.addEventListener("load", function (e) {                      callback('ok', e);                  }, false);                  xhr.addEventListener("error", function (e) {                      callback('error', e);                  }, false);                  xhr.addEventListener("abort", function (e) {                      callback('cancel', e);                  }, false);              }              xhr.open("POST", url);              xhr.send(fd);          }          //音频采集          recorder.onaudioprocess = function (e) {              audioData.input(e.inputBuffer.getChannelData(0));              //record(e.inputBuffer.getChannelData(0));          }      };      //抛出异常      HZRecorder.throwError = function (message) {          alert(message);          throw new function () { this.toString = function () { return message; } }      }      //是否支持录音      HZRecorder.canRecording = (navigator.getUserMedia != null);      //获取录音机      HZRecorder.get = function (callback, config) {          if (callback) {              if (navigator.getUserMedia) {                  navigator.getUserMedia(                      { audio: true } //只启用音频                      , function (stream) {                          var rec = new HZRecorder(stream, config);                          callback(rec);                      }                      , function (error) {                          switch (error.code || error.name) {                              case 'PERMISSION_DENIED':                              case 'PermissionDeniedError':                                  HZRecorder.throwError('用户拒绝提供信息。');                                  break;                              case 'NOT_SUPPORTED_ERROR':                              case 'NotSupportedError':                                  HZRecorder.throwError('浏览器不支持硬件设备。');                                  break;                              case 'MANDATORY_UNSATISFIED_ERROR':                              case 'MandatoryUnsatisfiedError':                                  HZRecorder.throwError('无法发现指定的硬件设备。');                                  break;                              default:                                  HZRecorder.throwError('无法打开麦克风。异常信息:' + (error.code || error.name));                                  break;                          }                      });              } else {                  HZRecorder.throwErr('当前浏览器不支持录音功能。'); return;              }          }      }      window.HZRecorder = HZRecorder;  })(window);

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