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function runEncodeTest(log, callback) {
log("Executing encoding test");
var samplerate = 44100;
var channels = 2;
var bitrate = 128;
var mode = Shine.STEREO;
var shine = new Shine({
samplerate: samplerate,
channels: channels,
bitrate: bitrate,
mode: mode
});
var started = new Date;
var duration = 0.0;
var encoded = [];
var xhr = new XMLHttpRequest();
xhr.open("GET", "encode.wav", true);
xhr.responseType = "arraybuffer";
xhr.onload = function() {
var samples = xhr.response.byteLength / (2*channels);
var data = new Int16Array(xhr.response);
var buf = convertInterleavedBuffer(data, channels, samples);
duration += parseFloat(samples) / samplerate;
encoded.push(shine.encode(buf));
};
log("Got WAV file.");
log("Encoding..");
xhr.addEventListener("load", function () {
encoded.push(shine.close());
var ended = new Date
var encodingTime = (ended.getTime() - started.getTime())/1000
log("Done encoding.");
log("File duration: " + duration.toFixed(2) + " seconds");
log("Encoding time: " + encodingTime.toFixed(2) + " seconds");
log("Encoding rate: " + (duration/encodingTime).toFixed(2) + "X");
callback(new Blob(encoded));
});
xhr.send();
}
function convertInterleavedBuffer(buf, channels, samples) {
var chan, i;
ret = new Array(channels);
for (chan=0; chan<channels; chan++) {
ret[chan] = new Int16Array(samples);
for (i=0; i<samples; i++) {
ret[chan][i] = buf[i*channels + chan];
}
}
return ret;
}
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