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index.html
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index.html
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<!DOCTYPE html>
<html>
<head>
<title>Tonejs Midi</title>
<script
type="text/javascript"
src="https://unpkg.com/tone@latest/build/Tone.js"
></script>
<script
type="text/javascript"
src="https://unpkg.com/@tonejs/ui@0.0.8/build/tonejs-ui.js"
></script>
<script
type="text/javascript"
src="https://unpkg.com/@tonejs/midi"
></script>
</head>
<body>
<style type="text/css">
#FileDrop {
position: relative;
width: 100%;
height: 100px;
border: 2px dashed black;
color: black;
margin: 20px auto;
}
#FileDrop.Hover {
background-color: black;
color: white;
}
#FileDrop input {
position: absolute;
width: 100%;
height: 100%;
opacity: 0;
left: 0px;
top: 0px;
}
#FileDrop #Text {
position: absolute;
width: 100%;
height: 20px;
line-height: 20px;
left: 0px;
top: 50%;
transform: translate(0, -50%);
text-align: center;
}
textarea {
font-family: monospace;
height: 300px;
width: 100%;
display: inline-block;
position: relative;
float: left;
}
#Results {
position: relative;
width: 100%;
margin: 10px auto;
}
#Description {
position: relative;
width: 100%;
text-align: center;
height: 40px;
font-size: 16px;
margin: 10px auto;
font-family: sans-serif;
}
tone-play-toggle {
margin-top: 10px;
}
</style>
<tone-top-bar></tone-top-bar>
<tone-content>
<div id="Description">
Parse a MIDI file into a Tone.js-friendly JSON format.
</div>
<div id="FileDrop">
<div id="Text">
Drop a midi file here
</div>
<input type="file" accept="audio/midi" />
</div>
<div id="Results">
<textarea
id="ResultsText"
placeholder="json output..."
></textarea>
</div>
<tone-play-toggle disabled></tone-play-toggle>
</tone-content>
<script type="text/javascript">
if (
!(
window.File &&
window.FileReader &&
window.FileList &&
window.Blob
)
) {
document.querySelector("#FileDrop #Text").textContent =
"Reading files not supported by this browser";
} else {
const fileDrop = document.querySelector("#FileDrop");
fileDrop.addEventListener("dragenter", () =>
fileDrop.classList.add("Hover")
);
fileDrop.addEventListener("dragleave", () =>
fileDrop.classList.remove("Hover")
);
fileDrop.addEventListener("drop", () =>
fileDrop.classList.remove("Hover")
);
document
.querySelector("#FileDrop input")
.addEventListener("change", (e) => {
//get the files
const files = e.target.files;
if (files.length > 0) {
const file = files[0];
document.querySelector(
"#FileDrop #Text"
).textContent = file.name;
parseFile(file);
}
});
}
let currentMidi = null;
function parseFile(file) {
//read the file
const reader = new FileReader();
reader.onload = function (e) {
const midi = new Midi(e.target.result);
document.querySelector(
"#ResultsText"
).value = JSON.stringify(midi, undefined, 2);
document
.querySelector("tone-play-toggle")
.removeAttribute("disabled");
currentMidi = midi;
};
reader.readAsArrayBuffer(file);
}
const synths = [];
document
.querySelector("tone-play-toggle")
.addEventListener("play", (e) => {
const playing = e.detail;
if (playing && currentMidi) {
const now = Tone.now() + 0.5;
currentMidi.tracks.forEach((track) => {
//create a synth for each track
const synth = new Tone.PolySynth(Tone.Synth, {
envelope: {
attack: 0.02,
decay: 0.1,
sustain: 0.3,
release: 1,
},
}).toDestination();
synths.push(synth);
//schedule all of the events
track.notes.forEach((note) => {
synth.triggerAttackRelease(
note.name,
note.duration,
note.time + now,
note.velocity
);
});
});
} else {
//dispose the synth and make a new one
while (synths.length) {
const synth = synths.shift();
synth.disconnect();
}
}
});
</script>
</body>
</html>