53 lines
1.1 KiB
JavaScript
53 lines
1.1 KiB
JavaScript
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const path = require("node:path");
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const fs = require("node:fs");
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const midiDeviceRegExp = new RegExp("^midi[0-9]+$");
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let openDevice;
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let callback;
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module.exports = {
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"list": function () {
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var deviceNodeList = fs.readdirSync("/dev").filter(d => d.match(midiDeviceRegExp));
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return deviceNodeList.map(d => path.join("/dev", d));
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},
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"open": function (device, eventCB) {
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if (openDevice) {
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openDevice["read"].close();
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openDevice["write"].close();
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}
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var deviceName = path.basename(device);
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var devicePath = path.join("/dev", deviceName);
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openDevice = {
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"read": fs.createReadStream(devicePath),
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"write": fs.createWriteStream(devicePath)
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};
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if (eventCB) {
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callback = eventCB;
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openDevice.read.on("data", function (chunk) {
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callback(chunk);
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});
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}
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},
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"send": function (message) {
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if (!openDevice) return;
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var data = Buffer.from(new Uint8Array(message));
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openDevice["write"].write(data);
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},
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"close": function () {
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if (!openDevice) return;
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openDevice["read"].close();
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openDevice["write"].close();
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delete openDevice;
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delete callback;
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}
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};
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