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xuming06
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add web wav demo.
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‎24web/HZRecorder.js‎

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(function (window) {
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//兼容
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window.URL = window.URL || window.webkitURL;
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navigator.getUserMedia = navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia || navigator.msGetUserMedia;
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var HZRecorder = function (stream, config) {
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config = config || {};
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config.sampleBits = config.sampleBits || 16; //采样数位 8, 16
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config.sampleRate = config.sampleRate || (8000); //采样率(1/6 44100)
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var context = new AudioContext();
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var audioInput = context.createMediaStreamSource(stream);
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var recorder = context.createScriptProcessor(4096, 1, 1);
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var audioData = {
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size: 0 //录音文件长度
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, buffer: [] //录音缓存
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, inputSampleRate: context.sampleRate //输入采样率
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, inputSampleBits: 16 //输入采样数位 8, 16
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, outputSampleRate: config.sampleRate //输出采样率
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, oututSampleBits: config.sampleBits //输出采样数位 8, 16
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, input: function (data) {
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this.buffer.push(new Float32Array(data));
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this.size += data.length;
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}
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, compress: function () { //合并压缩
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//合并
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var data = new Float32Array(this.size);
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var offset = 0;
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for (var i = 0; i < this.buffer.length; i++) {
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data.set(this.buffer[i], offset);
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offset += this.buffer[i].length;
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}
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//压缩
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var compression = parseInt(this.inputSampleRate / this.outputSampleRate);
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var length = data.length / compression;
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var result = new Float32Array(length);
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var index = 0, j = 0;
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while (index < length) {
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result[index] = data[j];
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j += compression;
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index++;
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}
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return result;
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}
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, encodeWAV: function () {
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var sampleRate = Math.min(this.inputSampleRate, this.outputSampleRate);
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var sampleBits = Math.min(this.inputSampleBits, this.oututSampleBits);
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var bytes = this.compress();
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var dataLength = bytes.length * (sampleBits / 8);
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var buffer = new ArrayBuffer(44 + dataLength);
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var data = new DataView(buffer);
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var channelCount = 1;//单声道
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var offset = 0;
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var writeString = function (str) {
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for (var i = 0; i < str.length; i++) {
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data.setUint8(offset + i, str.charCodeAt(i));
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}
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}
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// 资源交换文件标识符
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writeString('RIFF'); offset += 4;
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// 下个地址开始到文件尾总字节数,即文件大小-8
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data.setUint32(offset, 36 + dataLength, true); offset += 4;
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// WAV文件标志
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writeString('WAVE'); offset += 4;
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// 波形格式标志
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writeString('fmt '); offset += 4;
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// 过滤字节,一般为 0x10 = 16
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data.setUint32(offset, 16, true); offset += 4;
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// 格式类别 (PCM形式采样数据)
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data.setUint16(offset, 1, true); offset += 2;
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// 通道数
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data.setUint16(offset, channelCount, true); offset += 2;
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// 采样率,每秒样本数,表示每个通道的播放速度
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data.setUint32(offset, sampleRate, true); offset += 4;
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// 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
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data.setUint32(offset, channelCount * sampleRate * (sampleBits / 8), true); offset += 4;
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// 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
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data.setUint16(offset, channelCount * (sampleBits / 8), true); offset += 2;
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// 每样本数据位数
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data.setUint16(offset, sampleBits, true); offset += 2;
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// 数据标识符
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writeString('data'); offset += 4;
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// 采样数据总数,即数据总大小-44
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data.setUint32(offset, dataLength, true); offset += 4;
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// 写入采样数据
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if (sampleBits === 8) {
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for (var i = 0; i < bytes.length; i++, offset++) {
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var s = Math.max(-1, Math.min(1, bytes[i]));
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var val = s < 0 ? s * 0x8000 : s * 0x7FFF;
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val = parseInt(255 / (65535 / (val + 32768)));
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data.setInt8(offset, val, true);
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}
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} else {
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for (var i = 0; i < bytes.length; i++, offset += 2) {
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var s = Math.max(-1, Math.min(1, bytes[i]));
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data.setInt16(offset, s < 0 ? s * 0x8000 : s * 0x7FFF, true);
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}
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}
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return new Blob([data], { type: 'audio/wav' });
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}
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};
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//开始录音
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this.start = function () {
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audioInput.connect(recorder);
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recorder.connect(context.destination);
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}
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//停止
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this.stop = function () {
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recorder.disconnect();
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}
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//获取音频文件
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this.getBlob = function () {
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this.stop();
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return audioData.encodeWAV();
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}
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//回放
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this.play = function (audio) {
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audio.src = window.URL.createObjectURL(this.getBlob());
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}
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//上传
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this.upload = function (url, callback) {
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var fd = new FormData();
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fd.append("audioData", this.getBlob());
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var xhr = new XMLHttpRequest();
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if (callback) {
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xhr.upload.addEventListener("progress", function (e) {
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callback('uploading', e);
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}, false);
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xhr.addEventListener("load", function (e) {
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callback('ok', e);
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}, false);
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xhr.addEventListener("error", function (e) {
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callback('error', e);
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}, false);
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xhr.addEventListener("abort", function (e) {
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callback('cancel', e);
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}, false);
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}
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xhr.open("POST", url);
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xhr.send(fd);
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}
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//音频采集
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recorder.onaudioprocess = function (e) {
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audioData.input(e.inputBuffer.getChannelData(0));
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//record(e.inputBuffer.getChannelData(0));
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}
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};
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//抛出异常
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HZRecorder.throwError = function (message) {
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alert(message);
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throw new function () { this.toString = function () { return message; } }
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}
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//是否支持录音
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HZRecorder.canRecording = (navigator.getUserMedia != null);
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//获取录音机
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HZRecorder.get = function (callback, config) {
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if (callback) {
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if (navigator.getUserMedia) {
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navigator.getUserMedia(
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{ audio: true } //只启用音频
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, function (stream) {
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var rec = new HZRecorder(stream, config);
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callback(rec);
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}
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, function (error) {
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switch (error.code || error.name) {
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case 'PERMISSION_DENIED':
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case 'PermissionDeniedError':
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HZRecorder.throwError('用户拒绝提供信息。');
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break;
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case 'NOT_SUPPORTED_ERROR':
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case 'NotSupportedError':
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HZRecorder.throwError('浏览器不支持硬件设备。');
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break;
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case 'MANDATORY_UNSATISFIED_ERROR':
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case 'MandatoryUnsatisfiedError':
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HZRecorder.throwError('无法发现指定的硬件设备。');
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break;
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default:
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HZRecorder.throwError('无法打开麦克风。异常信息:' + (error.code || error.name));
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break;
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}
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});
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} else {
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HZRecorder.throwErr('当前浏览器不支持录音功能。'); return;
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}
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}
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}
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window.HZRecorder = HZRecorder;
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})(window);

‎24web/image_demo.html‎

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<body>
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<div id="testPhone" class="weui_uploader_input_wrp" style="width:79px; height:79px;">
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</div>
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<hr>
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<input id="testFile" type="file">
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<hr>
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<img id="testImg" style="max-height: 300px; height: 8em; min-width:8em;">

‎24web/wav_record.html‎

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<!DOCTYPE html>
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
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<title></title>
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</head>
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<body>
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<div>
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<audio controls autoplay aria-controls="controls"></audio>
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<input onclick="startRecording()" type="button" value="录音"/>
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<input onclick="stopRecording()" type="button" value="停止"/>
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<input onclick="playRecording()" type="button" value="播放"/>
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</div>
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<script type="text/javascript" src="./HZRecorder.js"></script>
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<script>
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var recorder;
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var audio = document.querySelector('audio');
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function startRecording() {
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HZRecorder.get(function (rec) {
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recorder = rec;
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recorder.start();
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});
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}
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function stopRecording() {
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recorder.stop();
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}
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function playRecording() {
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recorder.play(audio);
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}
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</script>
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</body>
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</html>

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