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webMidiTimeCode.html
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<html>
<head>
<meta charset="utf-8"/>
<link id="favicon" rel="shortcut icon" type="image/png" href="data:image/png;base64,....==" />
<title>webMidiTimeCode</title>
</head>
<body>
<h1>webMidiTimeCode</h1>
<p>Generate MTC timecodes</p>
<button id="button_play">play</button>
<button id="button_stop">stop</button>
<button id="button_seek_10">seek 10</button>
<button id="button_seek_20">seek 20</button>
<script type="module">
const fakeMidiOutputDevice = {send:(data)=>{console.log("midiOutput.send", data);}};
const midiOutputs = [];
const MTCWorker = new Worker("midiTimeCode.js", {type: "module"});
MTCWorker.onmessage = function(event) {
const message = event.data.message;
if (message == 'sendMidi') {
for (let midiOutput of midiOutputs) {
midiOutput.send(event.data.data);
}
//console.log(event.data.data);
}
if (message == 'playing') {
//console.log(event.data.timecode_components);
}
}
document.getElementById("button_play").addEventListener('click', ()=>MTCWorker.postMessage({message: 'play'}));
document.getElementById("button_stop").addEventListener('click', ()=>MTCWorker.postMessage({message: 'stop'}));
document.getElementById("button_seek_10").addEventListener('click', ()=>MTCWorker.postMessage({message: 'seek', timestamp: 10 * 1000}));
document.getElementById("button_seek_20").addEventListener('click', ()=>MTCWorker.postMessage({message: 'seek', timestamp: 20 * 1000}));
// System Midi Input ---------------------------------------------------
function bindMidiDevices(midiAccess) {
midiOutputs.push(...midiAccess.outputs.values());
//MTCWorker.postMessage({message: 'init', midiOutputs: midiOutputs}, midiOutputs);
if (midiOutputs.length == 0) {
midiOutputs.push(fakeMidiOutputDevice);
}
};
function initMidi(bindMidiDevices) {
if (window.navigator.requestMIDIAccess) {
window.navigator.requestMIDIAccess({sysex: true})
.then(bindMidiDevices, function() {console.warn('MIDI Access Failed');});
} else {console.warn("No browser MIDI support");}
};
initMidi(bindMidiDevices);
</script>
</body>