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@battermann
Created July 21, 2019 14:29
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Web Midi with WebMidi.js
import WebMidi from 'webmidi'
var btn1 = document.createElement('BUTTON')
btn1.innerHTML = 'send to all channels'
btn1.onclick = function () { play(song, 'all') }
document.body.appendChild(btn1)
var btn2 = document.createElement('BUTTON')
btn2.innerHTML = 'only one channel'
btn2.onclick = function () { play(song, 1) }
document.body.appendChild(btn2)
function play (events, channel) {
const output = WebMidi.outputs[0]
const time = WebMidi.time
events.forEach(function (event) {
const opts = { time: time + event.time, duration: event.duration, rawVelocity: true, velocity: event.velocity }
output.playNote(event.pitch, channel, opts)
})
}
WebMidi.enable(function (err) {
if (err) {
console.log('WebMidi could not be enabled.', err)
} else {
console.log('WebMidi enabled!')
}
})
const song = [
{ time: 0, pitch: 69, duration: 144.92753623188406, velocity: 60 },
{ time: 0, pitch: 47, duration: 434.7826086956522, velocity: 60 },
{ time: 144.92753623188406, pitch: 64, duration: 144.92753623188406, velocity: 60 },
{ time: 289.8550724637681, pitch: 62, duration: 144.92753623188406, velocity: 60 },
{ time: 434.7826086956522, pitch: 66, duration: 144.92753623188406, velocity: 60 },
{ time: 434.7826086956522, pitch: 54, duration: 434.7826086956522, velocity: 60 },
{ time: 579.7101449275362, pitch: 61, duration: 144.92753623188406, velocity: 60 },
{ time: 724.6376811594203, pitch: 59, duration: 144.92753623188406, velocity: 60 },
{ time: 869.5652173913044, pitch: 64, duration: 144.92753623188406, velocity: 60 },
{ time: 869.5652173913044, pitch: 55, duration: 434.7826086956522, velocity: 60 },
{ time: 1014.4927536231885, pitch: 59, duration: 144.92753623188406, velocity: 60 },
{ time: 1159.4202898550725, pitch: 61, duration: 36.231884057971016, velocity: 60 },
{ time: 1195.6521739130435, pitch: 62, duration: 253.62318840579712, velocity: 60 },
{ time: 1304.3478260869565, pitch: 54, duration: 434.7826086956522, velocity: 60 },
{ time: 1449.2753623188405, pitch: 61, duration: 144.92753623188406, velocity: 60 },
{ time: 1594.2028985507245, pitch: 59, duration: 144.92753623188406, velocity: 60 },
{ time: 1739.1304347826087, pitch: 69, duration: 144.92753623188406, velocity: 60 },
{ time: 1739.1304347826087, pitch: 47, duration: 434.7826086956522, velocity: 60 },
{ time: 1884.0579710144928, pitch: 64, duration: 144.92753623188406, velocity: 60 },
{ time: 2028.985507246377, pitch: 62, duration: 144.92753623188406, velocity: 60 },
{ time: 2173.9130434782605, pitch: 66, duration: 144.92753623188406, velocity: 60 },
{ time: 2173.9130434782605, pitch: 54, duration: 434.7826086956522, velocity: 60 },
{ time: 2318.840579710145, pitch: 61, duration: 144.92753623188406, velocity: 60 },
{ time: 2463.768115942029, pitch: 59, duration: 144.92753623188406, velocity: 60 },
{ time: 2608.695652173913, pitch: 64, duration: 144.92753623188406, velocity: 60 },
{ time: 2608.695652173913, pitch: 55, duration: 434.7826086956522, velocity: 60 },
{ time: 2753.623188405797, pitch: 59, duration: 144.92753623188406, velocity: 60 },
{ time: 2898.550724637681, pitch: 61, duration: 36.231884057971016, velocity: 60 },
{ time: 2934.7826086956525, pitch: 62, duration: 253.62318840579712, velocity: 60 },
{ time: 3043.4782608695655, pitch: 54, duration: 434.7826086956522, velocity: 60 },
{ time: 3188.405797101449, pitch: 61, duration: 144.92753623188406, velocity: 60 },
{ time: 3333.3333333333335, pitch: 59, duration: 144.92753623188406, velocity: 60 },
{ time: 3478.2608695652175, pitch: 69, duration: 144.92753623188406, velocity: 60 },
{ time: 3478.2608695652175, pitch: 47, duration: 434.7826086956522, velocity: 60 },
{ time: 3623.1884057971015, pitch: 64, duration: 144.92753623188406, velocity: 60 },
{ time: 3768.1159420289855, pitch: 62, duration: 144.92753623188406, velocity: 60 },
{ time: 3913.0434782608695, pitch: 66, duration: 144.92753623188406, velocity: 60 },
{ time: 3913.0434782608695, pitch: 54, duration: 434.7826086956522, velocity: 60 },
{ time: 4057.971014492754, pitch: 61, duration: 144.92753623188406, velocity: 60 },
{ time: 4202.898550724638, pitch: 59, duration: 144.92753623188406, velocity: 60 },
{ time: 4347.826086956521, pitch: 64, duration: 144.92753623188406, velocity: 60 },
{ time: 4347.826086956521, pitch: 55, duration: 434.7826086956522, velocity: 60 },
{ time: 4492.753623188406, pitch: 59, duration: 144.92753623188406, velocity: 60 },
{ time: 4637.68115942029, pitch: 61, duration: 36.231884057971016, velocity: 60 },
{ time: 4673.913043478261, pitch: 62, duration: 253.62318840579712, velocity: 60 },
{ time: 4782.608695652174, pitch: 54, duration: 434.7826086956522, velocity: 60 },
{ time: 4927.536231884058, pitch: 61, duration: 144.92753623188406, velocity: 60 },
{ time: 5072.463768115942, pitch: 59, duration: 144.92753623188406, velocity: 60 },
{ time: 5217.391304347826, pitch: 61, duration: 1739.1304347826087, velocity: 60 },
{ time: 5217.391304347826, pitch: 47, duration: 434.7826086956522, velocity: 60 },
{ time: 5652.173913043479, pitch: 53, duration: 434.7826086956522, velocity: 60 },
{ time: 6086.956521739131, pitch: 54, duration: 434.7826086956522, velocity: 60 },
{ time: 6521.739130434782, pitch: 53, duration: 434.7826086956522, velocity: 60 },
{ time: 6956.521739130435, pitch: 62, duration: 869.5652173913044, velocity: 60 },
{ time: 6956.521739130435, pitch: 47, duration: 434.7826086956522, velocity: 60 },
{ time: 7391.304347826087, pitch: 53, duration: 434.7826086956522, velocity: 60 },
{ time: 7826.086956521739, pitch: 65, duration: 579.7101449275362, velocity: 60 },
{ time: 7826.086956521739, pitch: 54, duration: 434.7826086956522, velocity: 60 },
{ time: 8260.86956521739, pitch: 53, duration: 434.7826086956522, velocity: 60 },
{ time: 8405.797101449276, pitch: 68, duration: 289.8550724637681, velocity: 60 },
{ time: 8695.652173913042, pitch: 66, duration: 724.6376811594203, velocity: 60 },
{ time: 8695.652173913042, pitch: 46, duration: 434.7826086956522, velocity: 60 },
{ time: 9130.434782608696, pitch: 54, duration: 434.7826086956522, velocity: 60 },
{ time: 9420.289855072462, pitch: 67, duration: 144.92753623188406, velocity: 60 },
{ time: 9565.217391304348, pitch: 66, duration: 144.92753623188406, velocity: 60 },
{ time: 9565.217391304348, pitch: 55, duration: 434.7826086956522, velocity: 60 },
{ time: 9710.144927536232, pitch: 64, duration: 144.92753623188406, velocity: 60 },
{ time: 9855.072463768116, pitch: 61, duration: 144.92753623188406, velocity: 60 },
{ time: 10000, pitch: 58, duration: 144.92753623188406, velocity: 60 },
{ time: 10000, pitch: 54, duration: 434.7826086956522, velocity: 60 },
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{ time: 10434.782608695652, pitch: 46, duration: 434.7826086956522, velocity: 60 },
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{ time: 10869.565217391304, pitch: 66, duration: 144.92753623188406, velocity: 60 },
{ time: 10869.565217391304, pitch: 54, duration: 434.7826086956522, velocity: 60 },
{ time: 11014.492753623188, pitch: 64, duration: 144.92753623188406, velocity: 60 },
{ time: 11159.420289855072, pitch: 66, duration: 144.92753623188406, velocity: 60 },
{ time: 11304.347826086958, pitch: 67, duration: 144.92753623188406, velocity: 60 },
{ time: 11304.347826086958, pitch: 55, duration: 434.7826086956522, velocity: 60 },
{ time: 11449.27536231884, pitch: 70, duration: 144.92753623188406, velocity: 60 },
{ time: 11594.202898550724, pitch: 73, duration: 724.6376811594203, velocity: 60 },
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{ time: 12463.76811594203, pitch: 73, duration: 144.92753623188406, velocity: 60 },
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{ time: 12608.695652173912, pitch: 54, duration: 434.7826086956522, velocity: 60 },
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{ time: 13043.478260869564, pitch: 69, duration: 144.92753623188406, velocity: 60 },
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]
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