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midi.html
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midi.html
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<html>
<head>
<meta charset="UTF-8">
<title>Web MIDI API</title>
<style>
*:before, *:after {
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
h4 {
margin: 0 0 5px 0;
}
p {
margin: 0 0 10px 0;
}
#content, #device_info {
max-width: 800px;
margin: 0 auto;
padding: 10px 0;
font-family: sans-serif;
font-size: 12px;
line-height: 12px;
letter-spacing: 1.5px;
}
#content, #key_data {
margin-top: 0px;
text-align: center;
}
#inputs, #outputs {
display: inline-block;
width: 49%;
margin-top: 10px;
vertical-align: top;
}
#outputs {
text-align: right;
}
.info {
padding: 20px;
border-radius: 3px;
box-shadow: inset 0 0 10px #ccc;
background-color: rgba(233,233,233,0.25);
}
.small {
border-bottom: 1px solid #ccc;
margin-left: 10px;
}
p:not(.small){
text-transform: uppercase;
font-weight: 800;
}
@keyframes shake {
0% {
transform: translateX(0);
transform: translateY(0);
transform: scale(1,1);
}
20% {
transform: translateX(-10px);
transform: translateY(-100px);
transform: scale(0.5,0.75);
}
40% {
transform: translateX(10px);
transform: translateY(0px);
transform: scale(1.5,2);
}
60% {
transform: translateX(-10px);
transform: translateY(-50px);
transform: scale(0.5,0.75);
}
80% {
transform: translateX(10px);
transform: translateY(50px);
transform: scale(1.3,2);
}
100% {
transform: translateX(0);
transform: translateY(0);
}
}
</style>
</head>
<body>
<div id="device_info">
<div id="key_data"></div>
<div id="inputs"></div>
<div id="outputs"></div>
</div>
<script>
(function(){
//Code adapted by Scott O'Hair from:
//https://www.keithmcmillen.com/blog/making-music-in-the-browser-web-midi-api/
//Using the Web MIDI API:
//https://webaudio.github.io/web-midi-api/#introduction
var log = console.log.bind(console), keyData = document.getElementById('key_data'),
deviceInfoInputs = document.getElementById('inputs'), deviceInfoOutputs = document.getElementById('outputs'), midi;
var AudioContext = AudioContext || webkitAudioContext; // for ios/safari
var context = new AudioContext();
var activeNotes = [];
var btnBox = document.getElementById('content'), btn = document.getElementsByClassName('button');
var data, cmd, channel, type, note, velocity;
//Create global vars for use in send method - scott
var outputs, inputs;
// request MIDI access
if(navigator.requestMIDIAccess){
navigator.requestMIDIAccess({sysex: false}).then(onMIDISuccess, onMIDIFailure);
}
else {
alert("No MIDI support in your browser.");
}
// add event listeners
document.addEventListener('keydown', keyController);
document.addEventListener('keyup', keyController);
for(var i = 0; i < btn.length; i++){
btn[i].addEventListener('mousedown', clickPlayOn);
btn[i].addEventListener('mouseup', clickPlayOff);
}
// midi functions
function onMIDISuccess(midiAccess){
midi = midiAccess;
var inputs = midi.inputs.values();
// loop through all inputs
for(var input = inputs.next(); input && !input.done; input = inputs.next()){
// listen for midi messages
input.value.onmidimessage = onMIDIMessage;
listInputs(input);
}
// listen for connect/disconnect message
midi.onstatechange = onStateChange;
showMIDIPorts(midi);
}
function onMIDIMessage(event){
data = event.data,
cmd = data[0] >> 4,
channel = data[0] & 0xf,
type = data[0] & 0xf0, // channel agnostic message type. Thanks, Phil Burk.
note = data[1],
velocity = data[2];
// with pressure and tilt off
// note off: 128, cmd: 8
// note on: 144, cmd: 9
// pressure / tilt on
// pressure: 176, cmd 11:
// bend: 224, cmd: 14
log('MIDI data', data);
switch(type){
case 144: // noteOn message
noteOn(note, velocity);
break;
case 128: // noteOff message
noteOff(note, velocity);
break;
}
//log('data', data, 'cmd', cmd, 'channel', channel);
logger(keyData, 'key data', data);
}
function onStateChange(event){
showMIDIPorts(midi);
var port = event.port, state = port.state, name = port.name, type = port.type;
if(type == "input")
log("name", name, "port", port, "state", state);
}
function listInputs(inputs){
var input = inputs.value;
log("Input port : [ type:'" + input.type + "' id: '" + input.id +
"' manufacturer: '" + input.manufacturer + "' name: '" + input.name +
"' version: '" + input.version + "']");
}
function noteOn(midiNote, velocity){
console.log('Testing MIDI-Out ports...');
console.log('outputs::::: ', outputs );
//next step is to allow for selection of devices that need to be sent over connection,
//then instead of looping through all available outputs, loop through one or more selected devices
//and send their data over WebRTC
//example of selecting an individual device ID (uses my test nanokorg ID):
//testoutput = outputs.get(-1583941628) //example of a call to a single output device
//console.log('testoutput::::: ', test1 );
outputs.forEach(function(port){
console.log('OUT id:', port.id, 'manufacturer:', port.manufacturer, 'name:', port.name, 'version:', port.version);
port.open();
port.send([0x90, midiNote, 0x7f]);
});
}
function noteOff(midiNote, velocity){
outputs.forEach(function(port){
port.send([0x80, midiNote, 0]);
});
}
function onMIDIFailure(e){
log("No access to MIDI devices or your browser doesn't support WebMIDI API. Please use WebMIDIAPIShim " + e);
}
// MIDI utility functions
function showMIDIPorts(midiAccess){
var html;
inputs = midiAccess.inputs, outputs = midiAccess.outputs;
html = '<h4>MIDI Inputs:</h4><div class="info">';
inputs.forEach(function(port){
html += '<p>' + port.name + '<p>';
html += '<p class="small">connection: ' + port.connection + '</p>';
html += '<p class="small">state: ' + port.state + '</p>';
html += '<p class="small">manufacturer: ' + port.manufacturer + '</p>';
if(port.version){
html += '<p class="small">version: ' + port.version + '</p>';
}
});
deviceInfoInputs.innerHTML = html + '</div>';
html = '<h4>MIDI Outputs:</h4><div class="info">';
outputs.forEach(function(port){
html += '<p>' + port.name + '<br>';
html += '<p class="small">manufacturer: ' + port.manufacturer + '</p>';
if(port.version){
html += '<p class="small">version: ' + port.version + '</p>';
}
});
deviceInfoOutputs.innerHTML = html + '</div>';
}
function logger(container, label, data){
messages = label + " [channel: " + (data[0] & 0xf) + ", cmd: " + (data[0] >> 4) + ", type: " + (data[0] & 0xf0) + " , note: " + data[1] + " , velocity: " + data[2] + "]";
container.textContent = messages;
}
})();
</script>
</body>
</html>