如何使用NAudio播放来自UDP数据包的音频流？
如何使用NAudio播放来自UDP数据包的音频流？
提问于 2020-05-26 19:18:28
我从Voicemeeter本地接收数据，它使用VBAN协议发送字节流。
我试图使用NAudio来解码字节，并使用WaveOutEvent播放音频。我的实现与来自NetworkChatDemo的NAudioDemo几乎是一样的，查看这个链接来了解更多关于NAudio的信息，这是一个很棒的音频库，非常感谢Mark。
我的实施：
private readonly ILogger<AudioController> _logger;
private NetworkAudioPlayer player;
private readonly INetworkChatCodec _codec;
public AudioController(ILogger<AudioController> logger)
{
_logger = logger;
_codec = new ALawChatCodec();
}
[HttpGet]
[Route("start")]
public IActionResult Start()
{
var receiver = new UdpAudioReceiver(6980);
player = new NetworkAudioPlayer(_codec, receiver);
return Ok("Hello");
}网络音频播放器：
private readonly INetworkChatCodec codec;
private readonly IAudioReceiver receiver;
private readonly IWavePlayer waveOut;
private readonly BufferedWaveProvider waveProvider;
public NetworkAudioPlayer(INetworkChatCodec codec, IAudioReceiver receiver)
{
this.codec = codec;
this.receiver = receiver;
receiver.OnReceived(OnDataReceived);
waveOut = new WaveOutEvent();
waveProvider = new BufferedWaveProvider(codec.RecordFormat);
waveProvider.BufferDuration = TimeSpan.FromSeconds(300);
waveOut.Init(waveProvider);
waveOut.Play();
}
void OnDataReceived(byte[] compressed)
{
byte[] decoded = codec.Decode(compressed, 0, compressed.Length);
waveProvider.AddSamples(decoded, 0, decoded.Length);
}
public void Dispose()
{
receiver?.Dispose();
waveOut?.Dispose();
}在这个实施过程中，我有两个问题：
- 首先，我无法将BufferDuration设置为无限值，因为它是一个活动流。
- 第二，除了噪音，我什么也没听到。
如何将BufferDuration设置为无穷大？
如何正确播放音频？
更新:我能够解决第一个问题，方法是将DiscardOnBufferOverflow的bufferPorivider值设置为等于true。
关于噪音问题，我已经从这个问题中找到了解决方案，Mark提到
另外，您是否确定在接收的网络数据包中没有周围的元数据？如果是这样的话，那就需要去掉，否则就会产生噪音。
因此，在向BufferProvider添加示例时，我将偏移量的值更改为等于28，这将导致异常：
void OnDataReceived(byte[] compressed)
{
var l = compressed.Length;
waveProvider.AddSamples(compressed, 28, compressed.Length);
}堆栈跟踪：
>
> System.ArgumentException
HResult=0x80070057
Message=Source array was not long enough. Check the source index, length, and the array's lower bounds. (Parameter 'sourceArray')
Source=System.Private.CoreLib
StackTrace:
at System.Array.Copy(Array sourceArray, Int32 sourceIndex, Array destinationArray, Int32 destinationIndex, Int32 length, Boolean reliable)
at System.Array.Copy(Array sourceArray, Int32 sourceIndex, Array destinationArray, Int32 destinationIndex, Int32 length)
at NAudio.Utils.CircularBuffer.Write(Byte[] data, Int32 offset, Int32 count)
at NAudio.Wave.BufferedWaveProvider.AddSamples(Byte[] buffer, Int32 offset, Int32 count)
at POC.AudioStreaming.AudioManagers.NetworkAudioPlayer.OnDataReceived(Byte[] compressed) in C:\dev\POC.AudioStreaming\POC.AudioStreaming\AudioManagers\NetworkAudioPlayer.cs:line 41
at POC.AudioStreaming.AudioManagers.UdpAudioReceiver.ListenerThread(Object state) in C:\dev\POC.AudioStreaming\POC.AudioStreaming\AudioManagers\UdpAudioReceiver.cs:line 38
at System.Threading.QueueUserWorkItemCallback.<>c.<.cctor>b__6_0(QueueUserWorkItemCallback quwi)
at System.Threading.ExecutionContext.RunForThreadPoolUnsafe[TState](ExecutionContext executionContext, Action`1 callback, TState& state)
at System.Threading.QueueUserWorkItemCallback.Execute()
at System.Threading.ThreadPoolWorkQueue.Dispatch()
at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()如何解决此异常？
Stack Overflow用户
发布于 2020-05-27 10:35:40
我通过使用Skip函数从接收到的数据包中修剪前28个字节来解决异常：
void OnDataReceived(byte[] compressed)
{
byte[] buffer = compressed.Skip(28).ToArray();
waveProvider.AddSamples(buffer, 0, buffer.Length);
}通过解决异常，我能够很好地听到声音。我也回答了我的问题。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/62029728
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