Play raw audio from RTP stream

rtp-to-speaker.js

const Speaker = require('speaker');
const dgram = require('dgram');
const client = dgram.createSocket('udp4');

var speaker = new Speaker({
	channels: 2,
	bitDepth: 16,
	sampleRate: 48000
})

//udp stuff for rtp 
client.on('listening', function() {
	client.addMembership('239.69.0.186', '192.168.1.175');
});

client.on('message', function(message, remote) {
	var bufferL24 = message.slice(12); // cut off header (assuming no CSRCs), audio is L24
	var samples = bufferL24.length / 3; // calc samples
	var bufferL16 = Buffer.alloc(samples * 2); //create L16 buffer

	// "convert" L24 to L16
	for(var i = 0; i < samples; i++){
		bufferL16.writeUInt16LE(bufferL24.readUInt8(i*3 + 1) + (bufferL24.readUInt8(i*3) << 8), (i * 2));
	}

	speaker.write(bufferL16);
});

client.bind(5004);