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added logMidiEvent() #3

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added logMidiEvent() #3

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14 changes: 14 additions & 0 deletions index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -75,17 +75,31 @@
alert("The MIDI system failed to start. You're gonna have a bad time.");
}

function logMidiEvent(event, noteOn) {
var detailedEvent = {
type: noteOn ? 'note-on' : 'note-off',
device: event.data[0],
note: event.data[1],
velocity: event.data[2]
};
var message = JSON.stringify(detailedEvent);
console.log(message);
}

function MIDIMessageEventHandler(event) {

// Mask off the lower nibble (MIDI channel, which we don't care about)
switch (event.data[0] & 0xf0) {
case 0x90:
if (event.data[2]!=0) { // if velocity != 0, this is a note-on message
noteOn(event.data[1]);
logMidiEvent(event, true);
return;
}
// if velocity == 0, fall thru: it's a note-off. MIDI's weird, ya'll.
case 0x80:
noteOff(event.data[1]);
logMidiEvent(event, false);
return;
}
}
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