- (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 || 16; //采样数位 8, 16
- config.sampleRate = config.sampleRate || (16000); //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 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);
来源: http://www.bubuko.com/infodetail-1976950.html