public NetIQServerStream(IPEndPoint endpoint, int bufferSize, NetIQSampleFormat format)
{
//Set
this.endpoint = endpoint;
this.bufferSize = bufferSize;
this.format = format;
//Validate
if (endpoint.Port < 9000)
{
throw new Exception("Port must be >= 9000!");
}
if (bufferSize < 64 || bufferSize > NetIQUtil.GetMaxBufferSize(format))
{
throw new Exception("Buffer size is invalid.");
}
if (format != NetIQSampleFormat.Byte && format != NetIQSampleFormat.Short && format != NetIQSampleFormat.Float)
{
throw new Exception("Invalid format.");
}
//Make socket
sock = new Socket(SocketType.Dgram, ProtocolType.Udp);
//Create buffer and get pointers to it
buffer = new byte[((int)format / 8) * 2 * bufferSize];
bufferHandle = GCHandle.Alloc(buffer, GCHandleType.Pinned);
bufferPtrByte = (byte *)bufferHandle.AddrOfPinnedObject();
bufferPtrShort = (short *)bufferHandle.AddrOfPinnedObject();
bufferPtrFloat = (float *)bufferHandle.AddrOfPinnedObject();
}
public void OpenStream(ushort bufferSize, NetIQSampleFormat format)
{
//Validate
int maxBufferSize = NetIQUtil.GetMaxBufferSize(format);
if (bufferSize > maxBufferSize)
{
throw new Exception($"Max buffer size is {maxBufferSize}. Please lower the buffer size or make the sample format smaller.");
}
//Set
streamSampleFormat = format;
//Open the incoming buffer
streamBuffer = new byte[((int)format / 8) * 2 * bufferSize];
streamBufferHandle = GCHandle.Alloc(streamBuffer, GCHandleType.Pinned);
streamBufferPtrByte = (byte *)streamBufferHandle.AddrOfPinnedObject();
streamBufferPtrShort = (short *)streamBufferHandle.AddrOfPinnedObject();
streamBufferPtrFloat = (float *)streamBufferHandle.AddrOfPinnedObject();
//Open the outgoing buffer
sampleBuffer = UnsafeBuffer.Create(bufferSize, out sampleBufferPtr);
//Get port
int port = endpoint.Port + 1;
//Open socket
stream = new Socket(SocketType.Dgram, ProtocolType.Udp);
stream.Bind(new IPEndPoint(IPAddress.Any, port));
stream.BeginReceive(streamBuffer, 0, streamBuffer.Length, SocketFlags.None, OnStreamPacket, null);
//Send command to start streaming
NetIQCommandOpenStream cmd = new NetIQCommandOpenStream();
cmd.StreamPort = (ushort)port;
cmd.BufferSize = bufferSize;
cmd.SampleFormat = format;
cmd.SendOnSocket(sock);
}
public static int GetMaxBufferSize(NetIQSampleFormat fmt)
{
int bytesPerSample = ((int)fmt / 8) * 2;
return(65500 / bytesPerSample); //65527 is the max number of bytes a UDP frame can hold. We round that down a tad bit
}
