Move MIDI event queue processing into synth.js

src/app.js

@@ -46,10 +46,7 @@ function setupAudioGraph() {
 
 		for (var i = 0, length = buffer.length; i < length; i++) {
 			sampleTime += msPerSample;
-			if (synth.eventQueue.length && synth.eventQueue[0].timeStamp < sampleTime) {
-				synth.processMidiEvent(synth.eventQueue.shift());
-			}
-
+			synth.processQueuedEventsUpToSampleTime(sampleTime);
 			var output = synth.render();
 			outputL[i] = output[0];
 			outputR[i] = output[1];

src/synth.js

@@ -17,29 +17,35 @@ Synth.prototype.queueMidiEvent = function(ev) {
 	this.eventQueue.push(ev);
 };
 
+Synth.prototype.processQueuedEventsUpToSampleTime = function(sampleTime) {
+	if (this.eventQueue.length && this.eventQueue[0].timeStamp < sampleTime) {
+		this.processMidiEvent(this.eventQueue.shift());
+	}
+}
+
 Synth.prototype.processMidiEvent = function(ev) {
 	var cmd = ev.data[0] >> 4;
 	var channel = ev.data[0] & 0xf;
 	var noteNumber = ev.data[1];
 	var velocity = ev.data[2];
 	// console.log( "" + ev.data[0] + " " + ev.data[1] + " " + ev.data[2])
 	// console.log("midi: ch %d, cmd %d, note %d, vel %d", channel, cmd, noteNumber, velocity);
-	if (channel == 9) // Ignore drum channel
+	if (channel === 9) // Ignore drum channel
 		return;
-	if (cmd==8 || ((cmd==9)&&(velocity==0))) { // with MIDI, note on with velocity zero is the same as note off
+	if (cmd === 8 || (cmd === 9 && velocity === 0)) { // with MIDI, note on with velocity zero is the same as note off
 		this.noteOff(noteNumber);
-	} else if (cmd == 9) {
+	} else if (cmd === 9) {
 		this.noteOn(noteNumber, velocity/99.0); // changed 127 to 99 to incorporate "overdrive"
-	} else if (cmd == 10) {
+	} else if (cmd === 10) {
 		//this.polyphonicAftertouch(noteNumber, velocity/127);
-	} else if (cmd == 11) {
+	} else if (cmd === 11) {
 		this.controller(noteNumber, velocity/127);
-	} else if (cmd == 12) {
+	} else if (cmd === 12) {
 		//this.programChange(noteNumber);
-	} else if (cmd == 13) {
+	} else if (cmd === 13) {
 		this.channelAftertouch(noteNumber/127);
-	} else if (cmd == 14) {
-		this.pitchBend( ((velocity * 128.0 + noteNumber)-8192)/8192.0 );
+	} else if (cmd === 14) {
+		this.pitchBend(((velocity * 128.0 + noteNumber) - 8192)/8192.0);
 	}
 
 };
@@ -136,4 +142,4 @@ Synth.prototype.render = function() {
 	return [outputL * PER_VOICE_LEVEL, outputR * PER_VOICE_LEVEL];
 };
 
-module.exports = Synth;
+module.exports = Synth;