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var mp3Encoder;
var mp3Buffer = [];
onmessage = function(e)
{
switch (e.data.action)
{
case 'init':
init(e.data);
break;
case 'start':
start();
break;
case 'record':
record(e.data);
break;
case 'stop':
stop();
break;
}
};
function init(data)
{
var channels = data.channels || 1;
var sampleRate = data.sampleRate || 44100;
var bitRate = data.bitRate || 128;
if(data.type === 'audio/mp3')
{
importScripts('/bitrix/js/main/recorder/lame.min.js');
mp3Encoder = new lamejs.Mp3Encoder(channels, sampleRate, bitRate);
}
}
function start()
{
mp3Buffer = [];
}
function record(data)
{
var buffer = floatTo16BitPCM(data.input);
var chunk = mp3Encoder.encodeBuffer(buffer);
mp3Buffer.push(chunk);
}
function stop()
{
mp3Buffer.push(mp3Encoder.flush);
var resultBlob = new Blob(mp3Buffer, {type: 'audio/mpeg'});
postMessage({action: 'result', result: resultBlob});
mp3Buffer = [];
}
//todo: add dithering
function floatTo16BitPCM(input)
{
var length = input.length;
var result = new Int16Array(length);
var value;
for(var i = 0; i < length; i++)
{
if(input[i] > 1)
value = 1;
else if(input[i] < -1)
value = -1;
else
value = input[i];
result[i] = (value > 0 ? value * 32767 : value * 32768);
}
return result;
}