private void SendPacket(DmxUniverse universe, byte[] channels)
{
byte[] packet = new byte[125 + channels.Length];
// TODO: Don't encode the same string multiple times...
// Root layer
SetInt16(0, 0x10); // Preamble size
SetInt16(2, 0); // Postamble size
SetString(4, "ASC-E1.17"); // ACN Packet Identifier
SetInt16(16, (short)(0x7000 | (packet.Length - 16))); // PDU length
SetInt32(18, 0x00000004); // VECTOR_ROOT_E131_DATA
Buffer.BlockCopy(guidBytes, 0, packet, 22, 16); // Sender CID
// Framing layer
SetInt16(38, (short)(0x7000 | (packet.Length - 38))); // PDU length
SetInt32(40, 0x00000002); // VECTOR_E131_DATA_PACKET
SetString(44, SourceName); // Source name (max length 63 bytes due to null termination)
packet[108] = 100; // Priority (100 = default)
SetInt16(109, 0); // Synchronization address (universe) - 0 is unsynchronized
packet[111] = sequenceNumber++; // Sequence number: FIXME!
packet[112] = 0; // Options
SetInt16(113, universe.UniverseNumber);
// DMP layer
SetInt16(115, (short)(0x7000 | (packet.Length - 115))); // PDU length
packet[117] = 2; // VECTOR_DMP_SET_PROPERTY
packet[118] = 0xa1; // Address type and data type
SetInt16(119, 0); // First property and address
SetInt16(121, 1); // Address increment
SetInt16(123, (short)channels.Length);
Buffer.BlockCopy(channels, 0, packet, 125, channels.Length);
// Off we go!
client.Send(packet, packet.Length);
void SetInt16(int index, short value)
{
packet[index] = (byte)(value >> 8);
packet[index + 1] = (byte)(value & 0xff);
}
void SetInt32(int index, int value)
{
packet[index] = (byte)(value >> 24);
packet[index + 1] = (byte)(value >> 16);
packet[index + 2] = (byte)(value >> 8);
packet[index + 3] = (byte)(value & 0xff);
}
void SetString(int index, string value) =>
Encoding.UTF8.GetBytes(value, 0, value.Length, packet, index);
}
public void SendUniverse(DmxUniverse universe) => SendPacket(universe, universe.CloneChannels());
private void HandleChannelsChanged(object sender, byte[] channels)
{
DmxUniverse universe = (DmxUniverse)sender;
SendPacket(universe, channels);
}
public void WatchUniverse(DmxUniverse universe)
{
universe.ChannelsChanged += HandleChannelsChanged;
disposalActions += () => universe.ChannelsChanged -= HandleChannelsChanged;
}
