<html>
<body>Encoding mp3 from <code>testdata/Left44100.wav</code>
</body>
<script src="lame.all.js"></script>
<script>
function encodeMono(channels, sampleRate, samples) {
var buffer = [];
var mp3enc = new lamejs.Mp3Encoder(channels, sampleRate, 128);
var remaining = samples.length;
var maxSamples = 1152;
for (var i = 0; remaining >= maxSamples; i += maxSamples) {
var mono = samples.subarray(i, i + maxSamples);
var mp3buf = mp3enc.encodeBuffer(mono);
if (mp3buf.length > 0) {
buffer.push(new Int8Array(mp3buf));
}
remaining -= maxSamples;
}
var d = mp3enc.flush();
if(d.length > 0){
buffer.push(new Int8Array(d));
}
console.log('done encoding, size=', buffer.length);
var blob = new Blob(buffer, {type: 'audio/mp3'});
var bUrl = window.URL.createObjectURL(blob);
console.log('Blob created, URL:', bUrl);
window.myAudioPlayer = document.createElement('audio');
window.myAudioPlayer.src = bUrl;
window.myAudioPlayer.setAttribute('controls', '');
window.myAudioPlayer.play();
}
var wavFile = "testdata/Left44100.wav";
var request = new XMLHttpRequest();
request.open("GET", wavFile, true);
request.responseType = "arraybuffer";
// Our asynchronous callback
request.onload = function () {
var audioData = request.response;
var wav = lamejs.WavHeader.readHeader(new DataView(audioData));
console.log('wav:', wav);
var samples = new Int16Array(audioData, wav.dataOffset, wav.dataLen / 2);
encodeMono(wav.channels, wav.sampleRate, samples);
};
request.send();
// var encoder = lib.Mp3Encoder(1, 44100, 128);
</script>
</html>
