HTML5声音录制和播放功能的实现

互联网 18-7-2
本文通过实例代码给大家介绍了HTML5声音录制/播放功能，非常不错，具有参考借鉴价值，需要的朋友跟随脚本之家小编一起学习吧

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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