set_hdmi_audio.node.js

#!/usr/bin/env node

// Forces the audio card and profile in Linux
// tested on Mint, should work on other distros which use pulse audio.
//
// Requires pulseaudio and node installed in your path.
// apt install pulseaudio-utils pulseaudio
// apt install nodejs # or install it some other way
//
// For some reason my MEDIA PC would randomly change the output to dummy or internal
// and would disable HDMI.
// Sometimes it would also change the card order for no particular reason.
// This looks at the existing cards for output:hdmi-stereo-extra1
// and sets the card prfile to the correct card number.
//
// I read various Github articles on this, nothing really helped.
//
// If you want to use this, you'll need to figure out your audio output
// and change AudioOutputName to whatever it is.
//
// To find your output use this command.
// pactl list cards | less
// First you'll want to look at the "Card #", for example my 0th card is my GP107GL High Definition Audio Controller
// continue down and look at the "Profiles:", they'll show available: yes OR available: no.
// You can test each available one with:
// pactl set-card-profile ## output:PROFILE_NAME
//
// Mine for example on this boot would be:
// pactl set-card-profile 0 output:hdmi-stereo-extra1

const AudioOutputName = 'hdmi-stereo-extra1';

const init = async () => {
	const cp = require('child_process');
	const stdout = cp.execSync('pactl list cards');
	let cardNum;
	stdout.toString().split("\n").forEach(line => {
		const card = line.match(/Card #(\d+)/);
		cardNum = (card) ? card[1] : cardNum;
		if (new RegExp(AudioOutputName).test(line)) {
			const cmd = `pactl set-card-profile ${cardNum} output:${AudioOutputName}`;
			console.log(`${AudioOutputName} is on Card #${cardNum}`);
			console.log('Setting Output:', cmd);
			cp.execSync(cmd);
			process.exit(0);
		}
	});
};

init();