扣丁学堂HTML5培训分享HTML5声音录制/播放功能的实现代码

勤能补拙孰能生巧

2019-06-14

本篇文章扣丁学堂HTML5培训小编通过实例代码给小伙伴们介绍一下HTML5声音录制/播放功能，文中有详细的代码供小伙伴们参考，感兴趣的小伙伴随小编一起学习吧。

html代码：

&lt;!DOCTYPE html&gt;
&lt;html&gt;
 &lt;head&gt;
 &lt;meta http-equiv="Content-Type" content="text/html; charset=utf-8" /&gt;
 &lt;title&gt;火星黑洞&lt;/title&gt;
 &lt;/head&gt;
 &lt;body&gt;
 &lt;div&gt;
 &lt;audio autoplay&gt;&lt;/audio&gt;
 &lt;input onclick="startRecording()" type="button" value="录音" /&gt;
 &lt;input onclick="stopRecording()" type="button" value="停止" /&gt;
 &lt;input onclick="playRecording()" type="button" value="播放" /&gt;
 &lt;input onclick="uploadAudio()" type="button" value="提交" /&gt;
 &lt;br /&gt;
 &lt;div id="recordingslist"&gt;&lt;/div&gt;
 &lt;/div&gt;
 &lt;script type="text/javascript" src="js/HZRecorder.js"&gt;&lt;/script&gt;
 &lt;script&gt;
 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 div = document.createElement('div');
 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;
 div.appendChild(au);
 div.appendChild(hf);
 recordingslist.appendChild(div);
 }
 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;
 }
 });
 }
 &lt;/script&gt;
 &lt;/body&gt;
&lt;/html&gt;

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 &lt; 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 &lt; 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 &lt; 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 &lt; bytes.length; i++, offset++) {
 var s = Math.max(-1, Math.min(1, bytes[i]));
 var val = s &lt; 0 ? s * 0x8000 : s * 0x7FFF;
 val = parseInt(255 / (65535 / (val + 32768)));
 data.setInt8(offset, val, true);
 }
 } else {
 for (var i = 0; i &lt; bytes.length; i++, offset += 2) {
 var s = Math.max(-1, Math.min(1, bytes[i]));
 data.setInt16(offset, s &lt; 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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