Keebwerk Nano Bento Pulseaudio Volumecontrol

keebwerk-nano-pulseaudio-v1.js

const midi = require('midi');
const debounce = require('debounce');
const {execSync} = require('child_process')

// Set up a new input.
const input = new midi.Input();

// Count the available input ports.
// console.log('COUNT:', input.getPortCount());
// console.log('P1:', input.getPortName(0));
// console.log('P2:', input.getPortName(1));

let lastVal = 0;

const dbDraw = debounce(draw, 20);

input.on('message', (deltaTime, message) => {
    const [status, d1, d2] = message;
    if(d2 === lastVal) {
        return;
    }

    dbDraw(d2)
    lastVal = d2;
})

input.openPort(1);
input.ignoreTypes(false, false, false);

function draw(input) {
    val = input / 127 * 100
    vol = Math.floor(input / 100 * 65500)

    console.log('#'.repeat(val), ' ' + vol);

    // execSync(`amixer sset Master ${val}%`);
    // console.log(`pacmd set-sink-volume 0 ${vol}`);
    execSync(`pacmd set-sink-volume 0 ${vol}`);
    execSync(`pacmd set-sink-volume 15 ${vol}`);
}