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WebMidiIMP.js
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WebMidiIMP.js
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'use strict';
const { WebMidi } = require('webmidi');
const midiOutputDevice = (() => {
let outputdevice = null;
return {
getInstance: () => { return outputdevice; },
setInstance: (device) => { outputdevice = device; }
};
})();
function setActiveMidiOutputDevice (outputDevice) {
midiOutputDevice.setInstance(outputDevice);
}
function getActiveMidiOutputDevice () {
return midiOutputDevice.getInstance();
}
// Initialize WebMidi
function onMidiEnabled () {
console.log('WebMidi- API Version: ' + WebMidi.version);
/*
displayInputOutputDevices()
//console.log("\nInput Devices:" + getInputDeviceDetails());
console.log(getInputDeviceDetails());
console.log(getOutputDeviceDetails());
sendCC(getOutputDevices()[0], 1, 1, 1);
*/
// midiOutputDevice = getOutputDevices()[1];
// console.log(getOutputDeviceDetails()[1])
// const outputCC = sendCC(midiOutputDevice, 16, 127, 126);
// console.log(outputCC);
// const outputPC = sendPC(midiOutputDevice, 16, 127);
// console.log(outputPC);
}
function sendCC (outputDevice, channel, cc, value) {
const options = {};
options.channels = [channel];
try {
const result = outputDevice.sendControlChange(cc, value, options);
return result;
} catch (error) {
console.log(error);
}
}
function sendCCselectedOut (channel, cc, value) {
sendCC(midiOutputDevice.getInstance(), channel, cc, value);
}
function sendPC (outputDevice, channel, pc) {
const options = {};
options.channels = [channel];
try {
const result = outputDevice.sendProgramChange(pc, options);
return result;
} catch (error) {
console.log(error);
}
}
function getInputDevices () {
const devices = [];
WebMidi.inputs.forEach((device) => {
devices.push(device);
});
return devices;
}
function getInputDeviceDetails () {
const deviceList = [];
getInputDevices().forEach((device) => {
deviceList.push({
id: device.id,
name: device.name,
manufacturer: device.manufacturer,
state: device.state
});
});
return deviceList;
}
function getOutputDevices () {
const devices = [];
WebMidi.outputs.forEach((device) => {
devices.push(device);
});
return devices;
}
function getOutputDeviceDetails () {
const deviceList = [];
getOutputDevices().forEach((device) => {
deviceList.push({
id: device.id,
name: device.name,
manufacturer: device.manufacturer,
state: device.state
});
});
return deviceList;
}
function displayInputOutputDevices () {
// Display available MIDI input devices
console.log('Input Devices:');
if (WebMidi.inputs.length < 1) {
console.log('No input device detected.');
} else {
WebMidi.inputs.forEach((device, index) => {
console.log(`${index}: ${device.name}`);
});
}
console.log('\nOutput Devices:');
if (WebMidi.outputs.length < 1) {
console.log('No output device detected.');
} else {
WebMidi.outputs.forEach((device, index) => {
console.log(`${index}: ${device.name}`);
});
}
}
function startWebMidi () {
WebMidi
.enable()
.then(onMidiEnabled)
.catch(err => console.log(err));
}
function disableWebMidi () {
WebMidi.disable();
}
module.exports = {
onMidiEnabled,
sendCCselectedOut,
startWebMidi,
disableWebMidi,
getOutputDevices,
getActiveMidiOutputDevice,
setActiveMidiOutputDevice
};