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Feat: midi() command support external instrument parameter mapping

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This commit adds a second argument to the midi() command: mapping.
This argument should be an object containing a key-value map of
MIDI controls used by an external synthesizer. If any control is
used that matches the mapping, a CC message is sent.
This commit is contained in:
Raphaël Forment 2024-11-09 01:41:59 +01:00
parent 2e72c7f4ed
commit ec470aa2c6
1 changed files with 22 additions and 9 deletions
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31
packages/midi/midi.mjs
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@ -89,11 +89,10 @@ if (typeof window !== 'undefined') {
});
}
Pattern.prototype.midi = function (output) {
Pattern.prototype.midi = function (output, mapping) {
if (isPattern(output)) {
throw new Error(
`.midi does not accept Pattern input. Make sure to pass device name with single quotes. Example: .midi('${
WebMidi.outputs?.[0]?.name || 'IAC Driver Bus 1'
`.midi does not accept Pattern input. Make sure to pass device name with single quotes. Example: .midi('${WebMidi.outputs?.[0]?.name || 'IAC Driver Bus 1'
}')`,
);
}
@ -103,8 +102,7 @@ Pattern.prototype.midi = function (output) {
const device = getDevice(output, outputs);
const otherOutputs = outputs.filter((o) => o.name !== device.name);
logger(
`Midi enabled! Using "${device.name}". ${
otherOutputs?.length ? `Also available: ${getMidiDeviceNamesString(otherOutputs)}` : ''
`Midi enabled! Using "${device.name}". ${otherOutputs?.length ? `Also available: ${getMidiDeviceNamesString(otherOutputs)}` : ''
}`,
);
},
@ -137,6 +135,23 @@ Pattern.prototype.midi = function (output) {
time: timeOffsetString,
});
}
// Handle mapped parameters if mapping exists
if (mapping && mapping.parameters) {
Object.entries(hap.value).forEach(([param, value]) => {
const mappedParam = mapping.parameters[param];
if (mappedParam && typeof value === 'number') {
const scaled = Math.round(value * 127);
device.sendControlChange(
mappedParam.cc,
scaled,
mappedParam.channel || midichan,
{ time: timeOffsetString }
);
}
});
}
if (ccv !== undefined && ccn !== undefined) {
if (typeof ccv !== 'number' || ccv < 0 || ccv > 1) {
throw new Error('expected ccv to be a number between 0 and 1');
@ -169,8 +184,7 @@ const refs = {};
export async function midin(input) {
if (isPattern(input)) {
throw new Error(
`midin: does not accept Pattern as input. Make sure to pass device name with single quotes. Example: midin('${
WebMidi.outputs?.[0]?.name || 'IAC Driver Bus 1'
`midin: does not accept Pattern as input. Make sure to pass device name with single quotes. Example: midin('${WebMidi.outputs?.[0]?.name || 'IAC Driver Bus 1'
}')`,
);
}
@ -184,8 +198,7 @@ export async function midin(input) {
if (initial) {
const otherInputs = WebMidi.inputs.filter((o) => o.name !== device.name);
logger(
`Midi enabled! Using "${device.name}". ${
otherInputs?.length ? `Also available: ${getMidiDeviceNamesString(otherInputs)}` : ''
`Midi enabled! Using "${device.name}". ${otherInputs?.length ? `Also available: ${getMidiDeviceNamesString(otherInputs)}` : ''
}`,
);
refs[input] = {};