(function (window) {
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var Player = function () {
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//创建一个音频环境对象
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audioContext = window.AudioContext || window.webkitAudioContext;
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var context = new audioContext();
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var isPlaying = false;
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var audioBuffers = []
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var audioBuffer = context.createBuffer(1, 8000, 8000);
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var playNextBuffer = function() {
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isPlaying = false;
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if (audioBuffers.length) {
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playAudio(audioBuffers.shift());
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}
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//if (audioBuffers.length > 1) audioBuffers.shift();
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//console.log(audioBuffers.length)
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};
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var copyToCtxBuffer = function(fromBuffer) {
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var nowBuffering = audioBuffer.getChannelData(0);
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var buffer = new Int8Array( fromBuffer);
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for (var i = 0; i < 8000; i++) {
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var word = (buffer[i * 2] & 0xff) + ((buffer[i * 2 + 1] & 0xff) << 8);
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nowBuffering[i] = (((word + 32768) % 65536) - 32768) / 32768.0;
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}
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};
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var playAudio = function(fromBuffer) {
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if (isPlaying) {
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//var buffer = new Int8Array( fromBuffer);
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//copyAudioOutputArray(buffer);
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audioBuffers.push(fromBuffer);
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return;
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}
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isPlaying = true;
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copyToCtxBuffer(fromBuffer);
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var source = context.createBufferSource();
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source.buffer = audioBuffer;
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source.connect(context.destination);
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source.onended = playNextBuffer;
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//setTimeout(playNextBuffer, audioBufferTime-audioBuffers.length*200);
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source.start();
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};
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config = {};
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config.channelCount = 1;
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config.numberOfInputChannels = config.channelCount;
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config.numberOfOutputChannels = config.channelCount;
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config.sampleBits = config.sampleBits || 16; //采样数位 8, 16
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//config.sampleRate = config.sampleRate || (context.sampleRate / 6); //采样率(1/6 44100)
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config.sampleRate = config.sampleRate || 8000; //采样率16K
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//创建缓存，用来缓存声音
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config.bufferSize = 8192;
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//将声音输入这个对像
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var audioOutput = context.createBufferSource();
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//设置音量节点
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var volume = context.createGain();
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audioOutput.connect(volume);
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// 创建声音的缓存节点，createScriptProcessor方法的
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// 第二个和第三个参数指的是输入和输出都是声道数。
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var player = context.createScriptProcessor(config.bufferSize, 0, config.channelCount);
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//开始播放
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this.start = function () {
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audioOutput.connect(player);
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player.connect(context.destination);
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};
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//停止
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this.stop = function () {
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player.disconnect();
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context.close();
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};
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this.addPlay = function (blob)
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{
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var reader = new FileReader();
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// 读取这四个字节
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reader.readAsArrayBuffer(blob);
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reader.onload = function (e) {
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var buffer = reader.result;
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var view = new DataView(buffer);
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playAudio(view.buffer);
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};
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};
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var $bo=$("#inbo");
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var $change=$("#change");
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var width=$bo.width();
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//音频采集
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player.onaudioprocess = function (e) {
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//console.log(e.playbackTime);
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};
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};
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//抛出异常
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Player.throwError = function (message) {
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throw new function () { this.toString = function () { return message; };};
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};
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//获取播放机
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Player.get = function (callback) {
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if (callback) {
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var rec = new Player();
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callback(rec);
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}
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};
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window.Player = Player;
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})(window);
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