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window.Track = (function() {
var HIT_TYPE_CIRCLE = 1,
HIT_TYPE_SLIDER = 2,
HIT_TYPE_NEWCOMBO = 4,
HIT_TYPE_SPINNER = 8;
function Track(track) {
var self = this;
this.track = track;
this.ondecoded = null;
this.general = {};
this.metadata = {};
this.difficulty = {};
this.colors = [];
this.events = [];
this.timingPoints = [];
this.hitObjects = [];
this.decode = _.bind(function decode() {
// Decodes a .osu file
var lines = self.track.replace("\r", "").split("\n");
if (lines[0] != "osu file format v13") {
// TODO: Do we care?
}
var section = null;
var combo = 0, index = 0;
for (var i = 0; i < lines.length; i++) {
var line = lines[i].trim();
if (line === "") continue;
if (line.indexOf("//") === 0) continue;
if (line.indexOf("[") === 0) {
console.log("Section " + line);
section = line;
continue;
}
switch (section) {
case "[General]":
var key = line.substr(0, line.indexOf(":"));
var value = line.substr(line.indexOf(":") + 1).trim();
if (isNaN(value)) {
self.general[key] = value;
} else {
self.general[key] = (+value);
}
break;
case "[Metadata]":
var key = line.substr(0, line.indexOf(":"));
var value = line.substr(line.indexOf(":") + 1).trim();
if (isNaN(value)) {
self.metadata[key] = value;
} else {
self.metadata[key] = (+value);
}
break;
case "[Events]":
self.events.push(line.split(","));
break;
case "[Difficulty]":
var parts = line.split(":");
var value = parts[1].trim();
if (isNaN(value)) {
self.difficulty[parts[0]] = value;
} else {
self.difficulty[parts[0]] = (+value);
}
break;
case "[TimingPoints]":
var parts = line.split(",");
var t = {
offset: +parts[0],
millisecondsPerBeat: +parts[1],
meter: +parts[2],
sampleType: +parts[3],
sampleSet: +parts[4],
volume: +parts[5],
inherited: +parts[6],
kaiMode: +parts[7]
};
if (t.millisecondsPerBeat < 0) {
t.inherited = 1;
}
this.timingPoints.push(t);
break;
case "[Colours]":
var parts = line.split(":");
var value = parts[1].trim();
self.colors.push(value.split(','));
break;
case "[HitObjects]":
var parts = line.split(",");
var hit = {
x: (+parts[0]) / 512,
y: (+parts[1]) / 384,
time: +parts[2],
type: +parts[3],
hitSound: +parts[4]
};
// Handle combos
if ((hit.type & HIT_TYPE_NEWCOMBO) > 0) {
combo++;
index = 0;
}
hit.combo = combo;
hit.index = index++;
// Decode specific hit object type
if ((hit.type & HIT_TYPE_CIRCLE) > 0) {
hit.type = "circle";
if (parts.length > 5) {
hit.addition = parts[5].split(":");
}
} else if ((hit.type & HIT_TYPE_SLIDER) > 0) {
hit.type = "slider";
var sliderKeys = parts[5].split("|");
hit.sliderType = sliderKeys[0];
hit.keyframes = [];
for (var j = 1; j < sliderKeys.length; j++) {
var p = sliderKeys[j].split(":");
hit.keyframes.push({ x: (+p[0]) / 512, y: (+p[1]) / 384 });
}
hit.repeat = +parts[6];
hit.pixelLength = +parts[7];
if (parts.length > 8) {
hit.edgeHitSound = +parts[8];
}
} else if ((hit.type & HIT_TYPE_SPINNER) > 0) {
hit.type = "spinner";
} else {
console.log("Attempted to decode unknown hit object type " + hit.type + ": " + line);
}
self.hitObjects.push(hit);
break;
}
}
// Make some corrections
this.general.PreviewTime /= 10;
if (this.general.PreviewTime > this.hitObjects[0].time) {
this.general.PreviewTime = 0;
}
if (this.colors.length === 0) {
this.colors = [
[96,159,159],
[192,192,192],
[128,255,255],
[139,191,222]
];
}
if (this.general.AudioLeadIn !== 0) {
for (var i = 0; i < this.hitObjects.length; i++) {
this.hitObjects[i].time -= this.general.AudioLeadIn / 10;
}
}
// Why do inherited timing points even exist, this is stupid
var last = this.timingPoints[0]
for (var i = 1; i < this.timingPoints.length; i++) {
var point = this.timingPoints[i];
if (point.inherited === 1) {
point.inherited = 0;
point.millisecondsPerBeat += last.millisecondsPerBeat;
} else {
last = point;
}
}
console.log("osu decoded");
if (this.ondecoded !== null) {
this.ondecoded(this);
}
}, this);
}
return Track;
})();
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