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midi.js
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midi.js
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function midiMessageReceived( ev ) {
var cmd = ev.data[0] >> 4;
var channel = ev.data[0] & 0xf;
var noteNumber = ev.data[1];
var velocity = ev.data[2];
if (channel == 9)
return
if ( cmd==8 || ((cmd==9)&&(velocity==0)) ) { // with MIDI, note on with velocity zero is the same as note off
// note off
openWebPiano.noteOff( noteNumber );
} else if (cmd == 9) {
// note on
openWebPiano.noteOn(noteNumber, velocity);
} else if (cmd == 11) {
//controller( noteNumber, velocity);
if (noteNumber == 64) {
openWebPiano.sustain(velocity);
}
} else if (cmd == 14) {
// pitch wheel
pitchWheel( ((velocity * 128.0 + noteNumber)-8192)/8192.0 );
} else if ( cmd == 10 ) { // poly aftertouch
polyPressure(noteNumber,velocity/127)
} else
console.log( "" + ev.data[0] + " " + ev.data[1] + " " + ev.data[2])
}
function sendMidiMessage(note,velo) {
if (midiOut) {
if (velo===0) {
midiOut.send( [0x80, note, 0x40] );
} else {
midiOut.send( [0x90, note, 0x7f] );
}
}
}
var selectMIDI = null;
var selectMIDIo = null;
var midiAccess = null;
var midiIn = null;
var midiOut = null;
function selectMIDIIn( ev ) {
if (midiIn)
midiIn.onmidimessage = null;
var id = ev.target[ev.target.selectedIndex].value;
if ((typeof(midiAccess.inputs) == "function")) //Old Skool MIDI inputs() code
midiIn = midiAccess.inputs()[ev.target.selectedIndex];
else
midiIn = midiAccess.inputs.get(id);
if (midiIn)
midiIn.onmidimessage = midiMessageReceived;
}
function selectMIDIOut( ev ) {
var id = ev.target[ev.target.selectedIndex].value;
if ((typeof(midiAccess.outputs) == "function")) //Old Skool MIDI inputs() code
midiIn = midiAccess.outputs()[ev.target.selectedIndex];
else
midiOut = midiAccess.outputs.get(id);
}
function populateMIDIInSelect() {
// clear the MIDI input select
selectMIDI.options.length = 0;
if (midiIn && midiIn.state=="disconnected")
midiIn=null;
var firstInput = null;
var inputs=midiAccess.inputs.values();
for ( var input = inputs.next(); input && !input.done; input = inputs.next()){
input = input.value;
if (!firstInput)
firstInput=input;
var str=input.name.toString();
var preferred = !midiIn && ((str.indexOf("USB") != -1)||(str.indexOf("Keyboard") != -1)||(str.indexOf("keyboard") != -1)||(str.indexOf("KEYBOARD") != -1));
// if we're rebuilding the list, but we already had this port open, reselect it.
if (midiIn && midiIn==input)
preferred = true;
selectMIDI.appendChild(new Option(input.name,input.id,preferred,preferred));
if (preferred) {
midiIn = input;
midiIn.onmidimessage = midiMessageReceived;
}
}
if (!midiIn) {
midiIn = firstInput;
if (midiIn)
midiIn.onmidimessage = midiMessageReceived;
}
}
function populateMIDIOutSelect() {
// clear the MIDI input select
selectMIDIo.options.length = 0;
if (midiOut && midiOut.state=="disconnected")
midiOut=null;
var firstOutput = null;
var outputs=midiAccess.outputs.values();
for ( var output = outputs.next(); output && !output.done; output = outputs.next()){
output = output.value;
if (!firstOutput)
firstOutput=output;
selectMIDIo.appendChild(new Option(output.name,output.id,false,false));
}
if (!midiOut) {
midiOut = firstOutput;
}
}
function midiConnectionStateChange( e ) {
console.log("connection: " + e.port.name + " " + e.port.connection + " " + e.port.state );
populateMIDIInSelect();
populateMIDIOutSelect();
}
function onMIDIStarted( midi ) {
var preferredIndex = 0;
midiAccess = midi;
selectMIDI=document.getElementById("midiIn");
selectMIDIo=document.getElementById("midiOut");
midi.onstatechange = midiConnectionStateChange;
populateMIDIInSelect();
populateMIDIOutSelect();
selectMIDI.onchange = selectMIDIIn;
selectMIDIo.onchange = selectMIDIOut;
}
function onMIDISystemError( err ) {
//document.getElementById("synthbox").className = "error";
console.log( "MIDI not initialized - error encountered:" + err.code );
}
//init: start up MIDI
window.addEventListener('load', function() {
if (navigator.requestMIDIAccess)
navigator.requestMIDIAccess().then( onMIDIStarted, onMIDISystemError );
});