internal static IntPtr CreatePacketList (MidiPacket [] packets)
{
// calculate the total size of the data.
int size = 4;
for (int i = 0; i < packets.Length; i++)
size += GetPacketLength (packets [i].Length);
// write it out
IntPtr buffer = Marshal.AllocHGlobal (size);
Marshal.WriteInt32 (buffer, 0, packets.Length);
int dest = 4;
for (int i = 0; i < packets.Length; i++) {
Marshal.WriteInt64 (buffer, dest, packets [i].TimeStamp);
dest += 8;
Marshal.WriteInt16 (buffer, dest, (short) packets [i].Length);
dest += 2;
if (packets [i].ByteArray == null) {
Runtime.memcpy (buffer + dest, packets [i].BytePointer, packets [i].Length);
} else {
Marshal.Copy (packets [i].ByteArray, packets [i].start, buffer + dest, packets [i].Length);
}
dest += GetPacketLength (packets [i].Length) - 10;
}
return buffer;
}
public MidiError Received (MidiPacket [] packets)
{
if (packets == null)
throw new ArgumentNullException ("packets");
var block = MidiPacket.CreatePacketList (packets);
var code = MIDIReceived (handle, block);
Marshal.FreeHGlobal (block);
return code;
}
internal static MidiPacket [] ReadPacketList (IntPtr packetList)
{
/*
* struct MIDIPacketList {
* UInt32 numPackets;
* MIDIPacket packet[]
* }
*/
int npackets = Marshal.ReadInt32 (packetList);
var packets = new MidiPacket [npackets];
packetList += 4;
for (int i = 0; i < npackets; i++){
int plen;
packets [i] = MidiPacket.ReadPacket (packetList, out plen);
packetList += plen;
}
return packets;
}
public MidiError Send (MidiEndpoint endpoint, MidiPacket [] packets)
{
if (endpoint == null)
throw new ArgumentNullException ("endpoint");
if (packets == null)
throw new ArgumentNullException ("packets");
var p = MidiPacket.CreatePacketList (packets);
var code = MIDISend (handle, endpoint.handle, p);
Marshal.FreeHGlobal (p);
return code;
}
