function __log(e, data) {
log.innerHTML += "\n" + e + " " + (data || '');
}
var audio_context;
var recorder;
function startUserMedia(stream) {
var input = audio_context.createMediaStreamSource(stream);
recorder = new Recorder(input, {
numChannels: 1
});
__log('<pan style="color:green">Sie haben der Aufnahme zugestimmt.</span>');
__log('<hr /><pan style="color:red"><strong>Aufnahmebereit.</strong></span<br />');
}
function startRecording(button) {
recorder && recorder.record();
button.disabled = true;
button.nextElementSibling.disabled = false;
__log('<span style="color:blue;"><strong>Achtung:</strong></span> AUFNAHME...');
}
function stopRecording(button) {
recorder && recorder.stop();
button.disabled = true;
button.previousElementSibling.disabled = false;
__log('AUFNAHME <strong>beendet</strong>.');
// create WAV download link using audio data blob
createDownloadLink();
recorder.clear();
}
function createDownloadLink() {
recorder && recorder.exportWAV(function(blob) {
});
}
window.onload = function init() {
try {
// webkit shim
window.AudioContext = window.AudioContext || window.webkitAudioContext;
navigator.getUserMedia = ( navigator.getUserMedia ||
navigator.webkitGetUserMedia ||
navigator.mozGetUserMedia ||
navigator.msGetUserMedia);
window.URL = window.URL || window.webkitURL;
audio_context = new AudioContext;
__log('<pan style="color:red"><strong>Sie müssen die Aufnahme erst erlauben.</strong></span>');
} catch (e) {
alert('Ihr Browser unterstützt leider nicht diese Aufnahme! <br /> Bitte nehmen Sie Ihre Sprachaufnahme z.B. mit dem Handy auf und laden diese anschliessend hoch.');
}
navigator.getUserMedia({audio: true}, startUserMedia, function(e) {
__log('Sie müssen an Ihrem PC die Audiofunktion aktivieren: ' + e);
});
};
(function(window){
var WORKER_PATH = 'recorder/recorderWorker.js';
var encoderWorker = new Worker('recorder/mp3Worker.js');
var Recorder = function(source, cfg){
var config = cfg || {};
var bufferLen = config.bufferLen || 4096;
var numChannels = config.numChannels || 2;
this.context = source.context;
this.node = (this.context.createScriptProcessor ||
this.context.createJavaScriptNode).call(this.context,
bufferLen, numChannels, numChannels);
var worker = new Worker(config.workerPath || WORKER_PATH);
worker.postMessage({
command: 'init',
config: {
sampleRate: this.context.sampleRate,
numChannels: numChannels
}
});
var recording = false,
currCallback;
this.node.onaudioprocess = function(e){
if (!recording) return;
var buffer = [];
for (var channel = 0; channel < numChannels; channel++){
buffer.push(e.inputBuffer.getChannelData(channel));
}
worker.postMessage({
command: 'record',
buffer: buffer
});
}
this.configure = function(cfg){
for (var prop in cfg){
if (cfg.hasOwnProperty(prop)){
config[prop] = cfg[prop];
}
}
}
this.record = function(){
recording = true;
}
this.stop = function(){
recording = false;
}
this.clear = function(){
worker.postMessage({ command: 'clear' });
}
this.getBuffer = function(cb) {
currCallback = cb || config.callback;
worker.postMessage({ command: 'getBuffer' })
}
this.exportWAV = function(cb, type){
currCallback = cb || config.callback;
type = type || config.type || 'audio/wav';
if (!currCallback) throw new Error('Callback not set');
worker.postMessage({
command: 'exportWAV',
type: type
});
}
//Mp3 conversion
worker.onmessage = function(e){
var blob = e.data;
//console.log("the blob " + blob + " " + blob.size + " " + blob.type);
var arrayBuffer;
var fileReader = new FileReader();
fileReader.onload = function(){
arrayBuffer = this.result;
var buffer = new Uint8Array(arrayBuffer),
data = parseWav(buffer);
console.log(data);
console.log("Converting to Mp3");
log.innerHTML += "\n" + "<hr /><pan style='color:green'>Ihre Aufnahme wird bearbeitet. <br />Dies kann je nach der Aufnahmedauer einige Minuten dauern..</span><hr />";
encoderWorker.postMessage({ cmd: 'init', config:{
mode : 3,
channels:1,
samplerate: data.sampleRate,
bitrate: data.bitsPerSample
}});
encoderWorker.postMessage({ cmd: 'encode', buf: Uint8ArrayToFloat32Array(data.samples) });
encoderWorker.postMessage({ cmd: 'finish'});
encoderWorker.onmessage = function(e) {
if (e.data.cmd == 'data') {
console.log("Ihre Aufnahme ist fertig und kann angehört werden");
log.innerHTML += "\n" + "<pan style='color:blue'>Ihre Aufnahme ist fertig und kann gleich<br />abgespielt/angehört werden</span>";
/*var audio = new Audio();
audio.src = 'data:audio/mp3;base64,'+encode64(e.data.buf);
audio.play();*/
//console.log ("The Mp3 data " + e.data.buf);
var mp3Blob = new Blob([new Uint8Array(e.data.buf)], {type: 'audio/mp3'});
uploadAudio(mp3Blob);
var url = 'data:audio/mp3;base64,'+encode64(e.data.buf);
var li = document.createElement('li');
var au = document.createElement('audio');
var hf = document.createElement('a');
var input = document.createElement('input');
au.controls = true;
au.src = url;
hf.href = url;
hf.download = new Date().getTime() + '.mp3';
hf.innerHTML = hf.download;
li.appendChild(au);
li.appendChild(hf);
recordingslist.appendChild(li);
}
};
};
fileReader.readAsArrayBuffer(blob);
currCallback(blob);
}
function encode64(buffer) {
var binary = '',
bytes = new Uint8Array( buffer ),
len = bytes.byteLength;
for (var i = 0; i < len; i++) {
binary += String.fromCharCode( bytes[ i ] );
}
return window.btoa( binary );
}
function parseWav(wav) {
function readInt(i, bytes) {
var ret = 0,
shft = 0;
while (bytes) {
ret += wav[i] << shft;
shft += 8;
i++;
bytes--;
}
return ret;
}
if (readInt(20, 2) != 1) throw 'Invalid compression code, not PCM';
if (readInt(22, 2) != 1) throw 'Invalid number of channels, not 1';
return {
sampleRate: readInt(24, 4),
bitsPerSample: readInt(34, 2),
samples: wav.subarray(44)
};
}
function Uint8ArrayToFloat32Array(u8a){
var f32Buffer = new Float32Array(u8a.length);
for (var i = 0; i < u8a.length; i++) {
var value = u8a[i<<1] + (u8a[(i<<1)+1]<<8);
if (value >= 0x8000) value |= ~0x7FFF;
f32Buffer[i] = value / 0x8000;
}
return f32Buffer;
}
function uploadAudio(mp3Data){
var reader = new FileReader();
reader.onload = function(event){
var fd = new FormData()
var mp3Name = (new Date().getTime() + '.mp3');
console.log("mp3name = " + mp3Name);
fd.append('fname', mp3Name);
fd.append('data', event.target.result);
$.ajax({
type: 'POST',
url: 'upload.php',
data: fd,
processData: false,
contentType: false
}).done(function(data) {
console.log(data);
log.innerHTML += "\n" + data;
});
};
reader.readAsDataURL(mp3Data);
}
source.connect(this.node);
this.node.connect(this.context.destination); //this should not be necessary
};
window.Recorder = Recorder;
})(window);
