webSocket 实时语音
// ws.binaryData = “blob”;
// ws.send(gRecorder.getBlob());
// gRecorder.clear();
gRecorder.stop();
door = false;
}
}
}
}
c.onclick = function() {
if(ws) {
//ws.close();
}
}
function pcm2wav(pcm_byte) {
var sampleRate = 8000; //采样率
var sampleBits = 16; //采样位数
var dataLength = pcm_byte.length;
var buffer = new ArrayBuffer(44 + dataLength);
var data = new DataView(buffer); //可使用 DataView 对象在 ArrayBuffer 中的任何位置读取和写入不同类型的二进制数据。
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;
//数据位
for(var i=0;i// 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 buffer;
//return new Blob([data], { type: 'audio/wav' });
}
var SRecorder = function(stream) {
config = {};
config.sampleBits = config.smapleBits || 16; //输出量化位数
config.sampleRate = config.sampleRate || (44100 / 6); //输出采样频率
console.log("输出量化位数："+config.sampleBits);
var context = new AudioContext(); //被移除下面函数体
console.log("输入采样频率："+context.sampleRate);
var audioInput = context.createMediaStreamSource(stream);
var recorder = context.createScriptProcessor(4096, 1, 1); //buffer size input channel output channel
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
, clear: function() {
this.buffer = []; //buffer里是一段一段的Float32数组
this.size = 0;
}
, input: function (data) {
this.buffer.push(new Float32Array(data)); //buffer存储float32,size为字节大小,buffer大小为float大小
this.size += data.length;
//console.log("当前大小:"+this.size);
console.log("**************");
console.log(this.buffer.length);
if(this.buffer.length==4) {
ws.binaryData = "blob";
ws.send(gRecorder.getBlob());
gRecorder.clear();
}
// gRecorder.stop();
}
, 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); //把buffer中的各个Float32数组合并成一个
offset += this.buffer[i].length;
}
//压缩
var compression = parseInt(this.inputSampleRate / this.outputSampleRate); //6
var length = data.length / compression; //600/6 = 10
var result = new Float32Array(length); // 32 位浮点值的类型化数组
var index = 0, j = 0;
while (index < length) {
result[index] = data[j];
j += compression; //j+=6
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); //一个Float32转成一个u8 或 u16;所以长度没问题
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' });
}
};
this.start = function () {
audioInput.connect(recorder);
recorder.connect(context.destination); //把麦克风的输入和音频采集相连起来 context.destination返回代表在环境中的音频的最终目的地。
}
this.stop = function () {
recorder.disconnect(); //断开连接
}
this.getBlob = function () {
return audioData.encodeWAV();
//return audioData.buffer;
}
this.clear = function() {
audioData.clear();
}
recorder.onaudioprocess = function (e) {
audioData.input(e.inputBuffer.getChannelData(0));
}
};
SRecorder.get = function (callback) {
if (callback) {
if (navigator.getUserMedia) {
navigator.getUserMedia(
{ audio: true },
function (stream) { //获取流成功后的回调，执行一次
var rec = new SRecorder(stream);
callback(rec);
},
function (){
console.log("接口调用失败后的回调");
})
}
}
}
function receive(e) {
//播放缓冲队列中的内容，播放后清空
audio.src = window.URL.createObjectURL(e);
}