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ola3.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<script type="text/javascript" src="OLA.js"></script>
<script type="text/javascript" src="../bpm-timeline.js/formulas.js"></script>
<script type="text/javascript" src="../bpm-timeline.js/bpm-timeline.js"></script>
<script type="text/javascript" src="SegmentProcessorV3.js"></script>
<script type="text/javascript">
var context = new AudioContext();
var BUFFER_SIZE = 2048;
var FRAME_SIZE = 4096;
var node = context.createScriptProcessor(BUFFER_SIZE, 2);
var buffer;
var sp;
var data;
function download_json(url, success, error) {
var request = new XMLHttpRequest();
request.open('GET', url, true);
request.onload = function() {
if (request.status >= 200 && request.status < 400) {
var data = JSON.parse(request.responseText);
success(data);
} else {
error();
}
};
request.onerror = error;
request.send();
}
// params: {beatsSrc: URL, duration: Number | beats: Array, duration: Number | bpm: Number, firstBeat: Number, duration: Number}
function load_beats(params, callback) {
var P = params;
if (P.duration) {
if (P.beatsSrc)
download_json(P.beatsSrc, function(beats) {
callback(createBeatsArray1(beats, P.duration));
});
else if (P.beats)
callback(createBeatsArray1(P.beats, P.duration));
else if (P.bpm!=undefined && P.firstBeat!=undefined)
callback(createBeatsArray2(P.bpm, P.firstBeat, P.duration));
else
throw "Invalid parameters";
} else
throw "Invalid parameters";
function createBeatsArray1(beats, duration) {
var _beats = new Array(beats.length);
B = beats;
var star, end, beatPeriod, beatBPM;
for (var i=0; i < B.length-1 && B[i] < duration; i++) {
start = B[i];
end = B[i+1];
beatPeriod = end - start;
beatBPM = 60 / beatPeriod;
_beats[i] = [start, beatBPM];
}
start = B[B.length-1];
end = start + beatPeriod;
if (end <= duration)
_beats[B.length-1] = [start, beatBPM];
return _beats;
}
function createBeatsArray2(bpm, firstBeat, duration) {
var beatPeriod = 60/bpm;
var beats = [];
for (var i=firstBeat || 0; i>0; i-=beatPeriod) {}
for (var t0=i; t0<duration; t0+=beatPeriod)
var t1 = t0 + beatPeriod;
if (t1<=duration)
beat[beats.length] = [t0, bpm];
return beats;
}
}
function parse_beats_json(obj) {
var arr = obj.beat[0].data;
var beats = new Array(arr.length);
for (var i=0; i < beats.length; i++) {
beats[i] = arr[i].time.value;
}
return beats;
}
loadSample = function(url, id) {
var request = new XMLHttpRequest();
request.open('GET', url, true);
request.responseType = 'arraybuffer';
request.onload = function() {
context.decodeAudioData(request.response, function(decodedData) {
download_json(beatsSrc, function(beatsJSON) {
var beats = parse_beats_json(beatsJSON);
buffer = decodedData;
load_beats({
beats: beats,
duration: buffer.duration
}, function(_data){
data = _data;
sp = new SegmentProcessorV3({initialBPM: 130});
sp.add_audio_data({id: "a1", audioBuffer: buffer, beats: data});
sp.add_interval({ audioId: "a1", tlStart: 0, segStart: 0, segDuration: 4, bpm: data[0][1]});
sp.add_interval({ audioId: "a1", tlStart: 4, segStart: 0, segDuration: 4, bpm: data[0][1]});
sp.add_interval({ audioId: "a1", tlStart: 8, segStart: 15, segDuration: 4, bpm: data[0][1]});
sp.add_interval({ audioId: "a1", tlStart: 12, segStart: 15, segDuration: 1, bpm: data[0][1]});
sp.add_interval({ audioId: "a1", tlStart: 13, segStart: 15, segDuration: 1, bpm: data[0][1]});
node.onaudioprocess = function(e) {
sp.process(e.outputBuffer);
}
node.connect(context.destination);
console.log("decoded");
});
});
});
};
request.send();
};
var beatsSrc = "http://localhost/annotator/Daft%20Punk%20-%20Discography%20-%201994-2013/01%20-%20Albums%20(CD%20Original)/beats/14.%20Too%20Long.json";
var audioSrc = "http://localhost/annotator/Daft%20Punk%20-%20Discography%20-%201994-2013/01%20-%20Albums%20(CD%20Original)/2001%20-%20Discovery%20-%20(320%20kbps)/14.%20Too%20Long.mp3";
// loadSample('http://localhost/soundtouchjs/1.mp3');
loadSample(audioSrc);
</script>
</body>
</html>