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Implemented "midimessage" event dispatching on noteOn/noteOff #7

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Implemented "midimessage" event dispatching on noteOn/noteOff #7

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51 changes: 35 additions & 16 deletions js/synth.js
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Original file line number Diff line number Diff line change
Expand Up @@ -68,30 +68,49 @@ var revNode = null;
var revGain = null;
var revBypassGain = null;

function createMidiMessageEvent(note, velocity) {

var evt = document.createEvent( "Event" );
evt.initEvent( "midimessage", false, false );
evt.data = new Uint8Array(3);
evt.data[0] = 144; // channel 1
evt.data[1] = note;
evt.data[2] = velocity || 0;

if (window.onmidimessage && typeof window.onmidimessage == 'function') {
window.onmidimessage( evt );
}
}

function frequencyFromNoteNumber( note ) {
return 440 * Math.pow(2,(note-69)/12);
return 440 * Math.pow(2,(note-69)/12);
}

function noteOn( note, velocity ) {
if (voices[note] == null) {
// Create a new synth node
voices[note] = new Voice(note, velocity);
var e = document.getElementById( "k" + note );
if (e)
e.classList.add("pressed");
}

createMidiMessageEvent(note, velocity);

if (voices[note] == null) {
// Create a new synth node
voices[note] = new Voice(note, velocity);
var e = document.getElementById( "k" + note );
if (e)
e.classList.add("pressed");
}
}

function noteOff( note ) {
if (voices[note] != null) {
// Shut off the note playing and clear it
voices[note].noteOff();
voices[note] = null;
var e = document.getElementById( "k" + note );
if (e)
e.classList.remove("pressed");
}

createMidiMessageEvent(note);

if (voices[note] != null) {
// Shut off the note playing and clear it
voices[note].noteOff();
voices[note] = null;
var e = document.getElementById( "k" + note );
if (e)
e.classList.remove("pressed");
}
}

function $(id) {
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