mv

frontend/midiPlayer.js

@@ -1,166 +1,166 @@
-class MidiTrack {
-	constructor(player, chunk) {
-		this.player = player;
-		this.events = chunk.events;
-
-		this.length = 0;
-		for (let i=0; i< this.events.length; i++) {
-			this.length += this.events[i].deltaTime;
-		}
-
-		this.index = 0;
-		this.lastTime = 0;
-	}
-
-	parseEvent(event) {
-		if (event instanceof MidiVoiceEvent) {
-			this.player.parseEvent(event);
-		} else if (event instanceof MidiSetTempoEvent) {
-			this.player.bpm = 60000000 / event.tempo;
-		}
-	}
-
-	tick(delta) {
-		while(true) {
-			if (this.index >= this.events.length) {
-				break;
-			}
-
-			let event = this.events[this.index];
-
-			if (this.lastTime + event.deltaTime - this.player.time <= 0) {
-				this.lastTime += event.deltaTime;
-				this.parseEvent(event);
-				this.index++;
-			} else {
-				break;
-			}
-		}
-	}
-}
-
-class MidiPlayer {
-	constructor() {
-		this.tracks = [];
-
-		this.playing = false;
-		this.speed = 1;
-		this.bpm = 120;
-		this.time = 0;
-	}
-
-	loadMidi(midi) {
-		this.tracks = [];
-		this.time = 0;
-		this.length = 0;
-		this.bpm = 120;
-		this.midi = midi;
-
-		if (!(this.midi.chunks[0] instanceof MidiHeaderChunk)) {
-			throw "No header chunk";
-		}
-
-		let header = this.midi.chunks[0];
-
-		this.format = header.format;
-
-		if ((header.division & 0x0800) === 1) {
-			throw "SMPTA time format not yet supported";
-		} else {
-			this.ticksPerQuarterNote = header.division;
-		}
-
-		for (let i=1; i<this.midi.chunks.length; i++) {
-			let chunk = this.midi.chunks[i];
-			if (chunk instanceof MidiTrackChunk) {
-				let track = new MidiTrack(this, chunk);
-				this.length = Math.max(track.length, this.length);
-				this.tracks.push(track);
-			}
-		}
-	}
-
-	parseEvent(event) {
-		if (event instanceof MidiNoteOnEvent) {
-			if (event.channel === 9) {
-				return;
-			}
-
-			if (event.velocity === 0) {
-				piano.localKeyUp(event.key, false);
-			} else {
-				piano.localKeyDown(event.key, event.velocity / 127);
-			}
-		} else if (event instanceof MidiNoteOffEvent) {
-			if (event.channel === 9) {
-				return;
-			}
-			piano.localKeyUp(event.key, false);
-		}
-	}
-
-	tick(delta) {
-		let deltaTicks = delta / 1000 * (this.bpm / 60) * this.ticksPerQuarterNote;
-		this.time += deltaTicks;
-
-		switch(this.format) {
-			case 0:
-				this.tracks[0].tick(deltaTicks);
-				break;
-			case 1:
-				for (let i=0; i<this.tracks.length; i++) {
-					this.tracks[i].tick(deltaTicks);
-				}
-				break;
-			case 2:
-				// Todo
-				break;
-		}
-
-		if (this.time >= this.length) {
-			this.time = this.length;
-			this.pause();
-		}
-	}
-
-	setTime(time) {
-		// TODO skip notes
-		this.time = time;
-	}
-
-	play() {
-		if (this.playing) return;
-
-		this.playing = true;
-
-		let lastTime = Date.now();
-		this.interval = setInterval(() => {
-			let delta = Date.now() - lastTime;
-			lastTime = Date.now();
-			this.tick(delta * this.speed);
-		}, 1000 / 60);
-	}
-
-	pause() {
-		this.playing = false;
-		clearInterval(this.interval);
-	}
-}
-
-let midiPlayer = new MidiPlayer();
-
-function uploadMidi() {
-	let input = document.createElement("input");
-	input.type = "file";
-	input.accept = "audio/midi";
-	input.addEventListener("change", function() {
-		let reader = new FileReader();
-		reader.addEventListener("load", function() {
-			let midiFile = new MidiFile(reader.result);
-			midiPlayer.loadMidi(midiFile);
-			console.log(midiFile);
-		});
-		reader.readAsArrayBuffer(input.files[0]);
-	});
-	input.click();
-}
+class MidiTrack {
+	constructor(player, chunk) {
+		this.player = player;
+		this.events = chunk.events;
+
+		this.length = 0;
+		for (let i=0; i< this.events.length; i++) {
+			this.length += this.events[i].deltaTime;
+		}
+
+		this.index = 0;
+		this.lastTime = 0;
+	}
+
+	parseEvent(event) {
+		if (event instanceof MidiVoiceEvent) {
+			this.player.parseEvent(event);
+		} else if (event instanceof MidiSetTempoEvent) {
+			this.player.bpm = 60000000 / event.tempo;
+		}
+	}
+
+	tick(delta) {
+		while(true) {
+			if (this.index >= this.events.length) {
+				break;
+			}
+
+			let event = this.events[this.index];
+
+			if (this.lastTime + event.deltaTime - this.player.time <= 0) {
+				this.lastTime += event.deltaTime;
+				this.parseEvent(event);
+				this.index++;
+			} else {
+				break;
+			}
+		}
+	}
+}
+
+class MidiPlayer {
+	constructor() {
+		this.tracks = [];
+
+		this.playing = false;
+		this.speed = 1;
+		this.bpm = 120;
+		this.time = 0;
+	}
+
+	loadMidi(midi) {
+		this.tracks = [];
+		this.time = 0;
+		this.length = 0;
+		this.bpm = 120;
+		this.midi = midi;
+
+		if (!(this.midi.chunks[0] instanceof MidiHeaderChunk)) {
+			throw "No header chunk";
+		}
+
+		let header = this.midi.chunks[0];
+
+		this.format = header.format;
+
+		if ((header.division & 0x0800) === 1) {
+			throw "SMPTA time format not yet supported";
+		} else {
+			this.ticksPerQuarterNote = header.division;
+		}
+
+		for (let i=1; i<this.midi.chunks.length; i++) {
+			let chunk = this.midi.chunks[i];
+			if (chunk instanceof MidiTrackChunk) {
+				let track = new MidiTrack(this, chunk);
+				this.length = Math.max(track.length, this.length);
+				this.tracks.push(track);
+			}
+		}
+	}
+
+	parseEvent(event) {
+		if (event instanceof MidiNoteOnEvent) {
+			if (event.channel === 9) {
+				return;
+			}
+
+			if (event.velocity === 0) {
+				piano.localKeyUp(event.key, false);
+			} else {
+				piano.localKeyDown(event.key, event.velocity / 127);
+			}
+		} else if (event instanceof MidiNoteOffEvent) {
+			if (event.channel === 9) {
+				return;
+			}
+			piano.localKeyUp(event.key, false);
+		}
+	}
+
+	tick(delta) {
+		let deltaTicks = delta / 1000 * (this.bpm / 60) * this.ticksPerQuarterNote;
+		this.time += deltaTicks;
+
+		switch(this.format) {
+			case 0:
+				this.tracks[0].tick(deltaTicks);
+				break;
+			case 1:
+				for (let i=0; i<this.tracks.length; i++) {
+					this.tracks[i].tick(deltaTicks);
+				}
+				break;
+			case 2:
+				// Todo
+				break;
+		}
+
+		if (this.time >= this.length) {
+			this.time = this.length;
+			this.pause();
+		}
+	}
+
+	setTime(time) {
+		// TODO skip notes
+		this.time = time;
+	}
+
+	play() {
+		if (this.playing) return;
+
+		this.playing = true;
+
+		let lastTime = Date.now();
+		this.interval = setInterval(() => {
+			let delta = Date.now() - lastTime;
+			lastTime = Date.now();
+			this.tick(delta * this.speed);
+		}, 1000 / 60);
+	}
+
+	pause() {
+		this.playing = false;
+		clearInterval(this.interval);
+	}
+}
+
+let midiPlayer = new MidiPlayer();
+
+function uploadMidi() {
+	let input = document.createElement("input");
+	input.type = "file";
+	input.accept = "audio/midi";
+	input.addEventListener("change", function() {
+		let reader = new FileReader();
+		reader.addEventListener("load", function() {
+			let midiFile = new MidiFile(reader.result);
+			midiPlayer.loadMidi(midiFile);
+			console.log(midiFile);
+		});
+		reader.readAsArrayBuffer(input.files[0]);
+	});
+	input.click();
+}