Play audio PCM stream over TCP in Unity with example broadcaster.

PlayPCMStreamOverTCP.cs

using UnityEngine;
using System.IO;
using System.Net.Sockets;
using System.Collections;
using System;

public class PlayPCMStreamOverTCP : MonoBehaviour
{
	
	public TcpClient Client { get; private set; }

	public string Hostname = "localhost";
	public int Port = 5555;
	public int Channels = 2;
	private NetworkStream _netStream;

	public void Awake ()
	{
		Screen.sleepTimeout = SleepTimeout.NeverSleep;
		int bufferSize, numBuffers;
		AudioSettings.GetDSPBufferSize (out bufferSize, out numBuffers);
		Client = new TcpClient (Hostname, Port);
		Client.NoDelay = true;
		Client.ReceiveTimeout = 0;
		_netStream = Client.GetStream ();
	}

	public void OnApplicationQuit ()
	{
		if (_netStream != null) {
			_netStream.Close ();
			_netStream = null;
		}
		if (Client != null) {
			Client.Close ();
			Client = null;
		}
	}

	public void OnAudioFilterRead (float[] data, int channels)
	{
		if (_netStream == null)
			return;
		var buffer = new byte[data.Length * 4];
		_netStream.Read (buffer, 0, buffer.Length);
		for (var i = 0; i < data.Length; i++) {
			data [i] = BitConverter.ToSingle (buffer, i * 4);
		}
	}

}

testBroadcaster.js

(function () {
  "use strict";
  
  const mp3File = "test.mp3";

  const lame = require("lame"),
    fs = require("fs"),
    net = require("net");
    
  const tcpServer = net.createServer(socket => {
    var pcmStream = fs.createReadStream(mp3File)
      .pipe(new lame.Decoder({
        bitDepth: 32,
        sampleRate: 48000
      }))
      .on('format', console.log);
    pcmStream.pipe(socket);
    socket.on("error", () => {});
    socket.on("close", () => {
      pcmStream.unpipe(socket);
      pcmStream.end();
      console.log("bye bye");
    });
  }).listen(5555);

  const address = tcpServer.address();
  console.log("TCP Server listening on " + address.address + ":" + address.port);

}());