console
(function (window) {
var recorder = {};
var audio = document.querySelector('audio');
function startRecording() {
HZRecorder.get(function (rec) {
recorder = rec;
recorder.start();
});
}
function obtainRecord(){
var record = recorder.getBlob();
console.log(record);
};
function stopRecord(){
recorder.stop();
};
function playRecord(){
recorder.play(audio);
};
function isupload() {
recorder.upload();
}
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;
config.sampleRate = config.sampleRate || (44100 / 6);
audioContext = window.AudioContext || window.webkitAudioContext;
var context = new audioContext();
var audioInput = context.createMediaStreamSource(stream);
var volume = context.createGain();
audioInput.connect(volume);
var bufferSize = 4096;
var recorder = context.createScriptProcessor(bufferSize, 2, 2);
var audioData = {
size: 0
, buffer: []
, inputSampleRate: context.sampleRate
, inputSampleBits: 16
, outputSampleRate: config.sampleRate
, oututSampleBits: config.sampleBits
, input: function (data) {
this.buffer.push(new Float32Array(data));
this.size += data.length;
}
, compress: function () {
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;
}
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;
var offset = 0;
var writeString = function (str) {
for (var i = 0; i < str.length; i++) {
data.setUint8(offset + i, str.charCodeAt(i));
}
};
writeString('RIFF');
offset += 4;
data.setUint32(offset, 36 + dataLength, true);
offset += 4;
writeString('WAVE');
offset += 4;
writeString('fmt ');
offset += 4;
data.setUint32(offset, 16, true);
offset += 4;
data.setUint16(offset, 1, true);
offset += 2;
data.setUint16(offset, channelCount, true);
offset += 2;
data.setUint32(offset, sampleRate, true);
offset += 4;
data.setUint32(offset, channelCount * sampleRate * (sampleBits / 8), true);
offset += 4;
data.setUint16(offset, channelCount * (sampleBits / 8), true);
offset += 2;
data.setUint16(offset, sampleBits, true);
offset += 2;
writeString('data');
offset += 4;
data.setUint32(offset, dataLength, true);
offset += 4;
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);
};
this.stop = function () {
recorder.disconnect();
};
this.getBlob = function () {
this.stop();
return audioData.encodeWAV();
};
this.play = function (audio) {
audio.src = window.URL.createObjectURL(this.getBlob());
};
this.upload = function (url, callback) {
var fd = new FormData();
console.log(this.getBlob());
return;
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);
};
recorder.onaudioprocess = function (e) {
audioData.input(e.inputBuffer.getChannelData(0));
};
};
HZRecorder.throwError = function (message) {
throw new function () {
this.toString = function () {
return message;
};
};
};
HZRecorder.canRecording = (navigator.getUserMedia != null);
HZRecorder.get = function (callback, config) {
if (callback) {
if (navigator.getUserMedia) {
navigator.getUserMedia(
{audio: true}
, 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('<a href="http://www.it165.net/edu/ewl/" target="_blank" class="keylink">浏览器</a>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<a href="http://www.it165.net/edu/ewl/" target="_blank" class="keylink">浏览器</a>不支持录音功能。');
return;
}
}
};
window.HZRecorder = HZRecorder;
})(window);
<span style="white-space:pre"></span>
<audio controls autoplay></audio>
<input type="button" value="开始录音" onclick="startRecording()"/>
<input type="button" value="获取录音" onclick="obtainRecord()"/>
<input type="button" value="停止录音" onclick="stopRecord()"/>
<input type="button" value="播放录音" onclick="playRecord()"/>
<input type="button" value="上传" onclick="isupload()"/>