discord.js/lib/Voice/VoicePacket.js

"use strict";

class VoicePacket {
		constructor(data, sequence, time, ssrc) {

				var audioBuffer = data,
				    returnBuffer = new Buffer(audioBuffer.length + 12);

				returnBuffer.fill(0);
				returnBuffer[0] = 0x80;
				returnBuffer[1] = 0x78;

				returnBuffer.writeUIntBE(sequence, 2, 2);
				returnBuffer.writeUIntBE(time, 4, 4);
				returnBuffer.writeUIntBE(ssrc, 8, 4);

				for (var i = 0; i < audioBuffer.length; i++) {
						returnBuffer[i + 12] = audioBuffer[i];
				}

				return returnBuffer;
		}
}

module.exports = VoicePacket;