我有两个应用程序，一个用于服务器，另一个用于客户端。在服务器中，我试图从麦克风接收音频，并通过Tcp / Ip将其流式传输到客户端。但是在客户端应用程序中，当我转换从服务器接收的byte []时，会出现以下错误“ NullReferenceException：对象引用未设置为对象的实例”
服务器
using UnityEngine;
using System.Collections;
using System.IO;
using UnityEngine.UI;
using System;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Collections.Generic;
public class AudioServer1 : MonoBehaviour
{
public bool enableLog = false;
private TcpListener listner;
private const int port = 8010;
private bool stop = false;
private List<TcpClient> clients = new List<TcpClient>();
//This must be the-same with SEND_COUNT on the client
const int SEND_RECEIVE_COUNT = 15;
int lastSample = 0;
public int FREQUENCY = 44100;
AudioClip mic;
int lastPos, pos;
byte[] AudioBytes = null;
private void Start()
{
Application.runInBackground = true;
mic = Microphone.Start(null, true, 10, FREQUENCY);
AudioSource audio = GetComponent<AudioSource>();
audio.clip = AudioClip.Create("test", 10 * FREQUENCY, mic.channels, FREQUENCY, false);
audio.loop = true;
//Start Mic coroutine
StartCoroutine(initAndWaitForMicTexture());
}
//Converts the data size to byte array and put result to the fullBytes array
void byteLengthToFrameByteArray(int byteLength, byte[] fullBytes)
{
//Clear old data
Array.Clear(fullBytes, 0, fullBytes.Length);
//Convert int to bytes
byte[] bytesToSendCount = BitConverter.GetBytes(byteLength);
//Copy result to fullBytes
bytesToSendCount.CopyTo(fullBytes, 0);
}
//Converts the byte array to the data size and returns the result
int frameByteArrayToByteLength(byte[] frameBytesLength)
{
int byteLength = BitConverter.ToInt32(frameBytesLength, 0);
return byteLength;
}
IEnumerator initAndWaitForMicTexture()
{
// Connect to the server
listner = new TcpListener(IPAddress.Any, port);
listner.Start();
while (101 < 100)
{
yield return null;
}
//Start sending coroutine
StartCoroutine(senderCOR());
}
WaitForEndOfFrame endOfFrame = new WaitForEndOfFrame();
IEnumerator senderCOR()
{
bool isConnected = false;
TcpClient client = null;
NetworkStream stream = null;
// Wait for client to connect in another Thread
Loom.RunAsync(() =>
{
while (!stop)
{
// Wait for client connection
client = listner.AcceptTcpClient();
// We are connected
clients.Add(client);
isConnected = true;
stream = client.GetStream();
}
});
//Wait until client has connected
while (!isConnected)
{
yield return null;
}
LOG("Connected!");
bool readyToGetFrame = true;
byte[] frameBytesLength = new byte[SEND_RECEIVE_COUNT];
while (!stop)
{
//Wait for End of frame
yield return endOfFrame;
byte[] pngBytes = AudioBytes;
//Fill total byte length to send. Result is stored in frameBytesLength
byteLengthToFrameByteArray(pngBytes.Length, frameBytesLength);
//Set readyToGetFrame false
readyToGetFrame = false;
Loom.RunAsync(() =>
{
//Send total byte count first
stream.Write(frameBytesLength, 0, frameBytesLength.Length);
LOG("Sent Audio byte Length: " + frameBytesLength.Length);
//Send the Audio bytes
stream.Write(pngBytes, 0, pngBytes.Length);
LOG("Sending Audio byte array data : " + pngBytes.Length);
//Sent. Set readyToGetFrame true
readyToGetFrame = true;
});
//Wait until we are ready to get new frame(Until we are done sending data)
while (!readyToGetFrame)
{
LOG("Waiting To get new frame");
yield return null;
}
}
}
void LOG(string messsage)
{
if (enableLog)
Debug.Log(messsage);
}
private void Update()
{
if ((pos = Microphone.GetPosition(null)) > 0)
{
if (lastPos > pos) lastPos = 0;
if (pos - lastPos > 0)
{
// Allocate the space for the sample.
float[] sample = new float[(pos - lastPos) * mic.channels];
// Get the data from microphone.
mic.GetData(sample, 0);
AudioBytes = ToByteArray(sample);
}
}
}
// stop everything
private void OnApplicationQuit()
{
if (listner != null)
{
listner.Stop();
}
foreach (TcpClient c in clients)
c.Close();
}
public byte[] ToByteArray(float[] floatArray)
{
int len = floatArray.Length * 4;
byte[] byteArray = new byte[len];
int pos = 0;
foreach (float f in floatArray)
{
byte[] data = System.BitConverter.GetBytes(f);
System.Array.Copy(data, 0, byteArray, pos, 4);
pos += 4;
}
return byteArray;
}
public float[] ToFloatArray(byte[] byteArray)
{
int len = byteArray.Length / 4;
float[] floatArray = new float[len];
for (int i = 0; i < byteArray.Length; i += 4)
{
floatArray[i / 4] = System.BitConverter.ToSingle(byteArray, i);
}
return floatArray;
}
}
客户
using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using System.Net.Sockets;
using System.Net;
using System.IO;
using System;
public class AudioClient1 : MonoBehaviour
{
public bool enableLog = false;
const int port = 8010;
public string IP = "192.168.10.2";
TcpClient client;
private bool stop = false;
//This must be the-same with SEND_COUNT on the server
const int SEND_RECEIVE_COUNT = 15;
// Use this for initialization
void Start()
{
Application.runInBackground = true;
//tex = new Texture2D(0, 0);
client = new TcpClient();
//Connect to server from another Thread
Loom.RunAsync(() =>
{
LOGWARNING("Connecting to server...");
// if on desktop
client.Connect(IPAddress.Loopback, port);
// if using the IPAD
//client.Connect(IPAddress.Parse(IP), port);
LOGWARNING("Connected!");
AudioReceiver();
});
}
void AudioReceiver()
{
//While loop in another Thread is fine so we don't block main Unity Thread
Loom.RunAsync(() =>
{
while (!stop)
{
//Read Audio Count
int AudioSize = readAudioByteSize(SEND_RECEIVE_COUNT);
LOGWARNING("Received Audio byte Length: " + AudioSize);
//Read Audio Bytes and Display it
readFrameByteArray(AudioSize);
}
});
}
//Converts the data size to byte array and put result to the fullBytes array
void byteLengthToFrameByteArray(int byteLength, byte[] fullBytes)
{
//Clear old data
Array.Clear(fullBytes, 0, fullBytes.Length);
//Convert int to bytes
byte[] bytesToSendCount = BitConverter.GetBytes(byteLength);
//Copy result to fullBytes
bytesToSendCount.CopyTo(fullBytes, 0);
}
//Converts the byte array to the data size and returns the result
int frameByteArrayToByteLength(byte[] frameBytesLength)
{
int byteLength = BitConverter.ToInt32(frameBytesLength, 0);
return byteLength;
}
/////////////////////////////////////////////////////Read Audio SIZE from Server///////////////////////////////////////////////////
private int readAudioByteSize(int size)
{
bool disconnected = false;
NetworkStream serverStream = client.GetStream();
byte[] AudioBytesCount = new byte[size];
var total = 0;
do
{
var read = serverStream.Read(AudioBytesCount, total, size - total);
//Debug.LogFormat("Client recieved {0} bytes", total);
if (read == 0)
{
disconnected = true;
break;
}
total += read;
} while (total != size);
int byteLength;
if (disconnected)
{
byteLength = -1;
}
else
{
byteLength = frameByteArrayToByteLength(AudioBytesCount);
}
return byteLength;
}
/////////////////////////////////////////////////////Read Audio Data Byte Array from Server///////////////////////////////////////////////////
private void readFrameByteArray(int size)
{
bool disconnected = false;
NetworkStream serverStream = client.GetStream();
byte[] AudioBytes = new byte[size];
var total = 0;
do
{
var read = serverStream.Read(AudioBytes, total, size - total);
//Debug.LogFormat("Client recieved {0} bytes", total);
if (read == 0)
{
disconnected = true;
break;
}
total += read;
} while (total != size);
bool readyToReadAgain = false;
//Play Audio
if (!disconnected)
{
//Play Audio on the main Thread
Loom.QueueOnMainThread(() =>
{
displayReceivedAudio(AudioBytes);
readyToReadAgain = true;
});
}
//Wait until old Audio is displayed
while (!readyToReadAgain)
{
System.Threading.Thread.Sleep(1);
}
}
void displayReceivedAudio(byte[] receivedAudioBytes)
{
Debug.Log(receivedAudioBytes.Length);
// Put the data in the audio source.
AudioSource audio = GetComponent<AudioSource>();
audio.clip.SetData(ToFloatArray(receivedAudioBytes), 0);
if (!audio.isPlaying) audio.Play();
}
public byte[] ToByteArray(float[] floatArray)
{
int len = floatArray.Length * 4;
byte[] byteArray = new byte[len];
int pos = 0;
foreach (float f in floatArray)
{
byte[] data = System.BitConverter.GetBytes(f);
System.Array.Copy(data, 0, byteArray, pos, 4);
pos += 4;
}
return byteArray;
}
public float[] ToFloatArray(byte[] byteArray)
{
int len = byteArray.Length / 4;
float[] floatArray = new float[len];
for (int i = 0; i < byteArray.Length; i += 4)
{
floatArray[i / 4] = System.BitConverter.ToSingle(byteArray, i);
}
return floatArray;
}
// Update is called once per frame
void Update()
{
}
void LOG(string messsage)
{
if (enableLog)
Debug.Log(messsage);
}
void LOGWARNING(string messsage)
{
if (enableLog)
Debug.LogWarning(messsage);
}
void OnApplicationQuit()
{
LOGWARNING("OnApplicationQuit");
stop = true;
if (client != null)
{
client.Close();
}
}
}
我得到的错误是下面的代码
void displayReceivedAudio(byte[] receivedAudioBytes)
{
Debug.Log(receivedAudioBytes.Length);
// Put the data in the audio source.
AudioSource audio = GetComponent<AudioSource>();
audio.clip.SetData(ToFloatArray(receivedAudioBytes), 0);
if (!audio.isPlaying) audio.Play();
}
答案 0 :(得分：0)
在设置音频剪辑的数据之前，需要AudioClip.Create（）。
作为替代，您可以使用“ OnAudioFilterRead（）”捕获游戏中的音频。一般情况下，应将麦克风声音捕获为游戏内音频的一部分。 “ OnAudioFilterRead（）”事件将返回带有特定采样率和通道的float []。您可以将它们转换为byte []以进行Tcp流传输。
在客户端，您可以解码它们并将其分配给空音频源。您需要在OnAudioFilterRead（）上分配float []才能使其可播放。
但是，当服务器和客户端设备之间的采样率和通道号不同时，仍然需要优化它们。在每次发送之前添加一些缓冲区也有帮助。
在我从事项目工作时，我找不到太多的参考/资源。 Unity论坛中有一个相关参考。
答案 1 :(得分：0)
此代码应进行更多优化，但首先请确定此行有错误：
audio.clip.SetData(ToFloatArray(receivedAudioBytes), 0);
因为您的剪辑为空，所以您应该使用创建检查此链接： https://docs.unity3d.com/ScriptReference/AudioClip.Create.html