Programming a MIDI Player

["Seb" <beastudio@iquebec.com>]

Hello everybody ,

 

I'm looking to code a MIDI Player using the low-level API of Windows ( WINMM.DLL and Stream Buffer).

In the SDK of DirectX 5, there's an example called MSTREAM and I only want to do almost the same

thing, but instead of translating MIDI File during playing, my own file is ALREADY translated. 

So I only have to read part of my own file (THIS WORKS), put in into a buffer and then send 

it to the MIDI API. But this don't work ! I need help on that !! 

 

Here is the small code I use for initialization :

 

 

"

// Var and definitions

 

#define    MAX_STREAMBUF_SIZE = 4096;

HMIDISTRM   My_MIDIDevice;

MIDIHDR       MIDIBuf;

MIDIPROPTIMEDIV   My_MIDIProp 

UINT             midiDeviceID = -1; 

 

 

// Code

 

midiStreamOpen( &My_MIDIDevice, &midiDeviceID,  

                (DWORD) 1, (DWORD) &My_MIDIProc, (DWORD) 0, CALLBACK_FUNCTION); 

MIDIBuf.dwBufferLength = MAX_STREAMBUF_SIZE;

MIDIBuf.lpData = (BYTE *) GlobalAllocPtr(GHND, MAX_STREAMBUF_SIZE ); 

 

ZeroMemory( &My_MIDIProp, sizeof(My_MIDIProp) );
My_MIDIProp.cbStruct = sizeof(My_MIDIProp);
My_MIDIProp.dwTimeDiv = MyMidAudio.TimeDivision;
midiStreamProperty(My_MIDIDevice, (LPBYTE) &My_MIDIProp, MIDIPROP_SET | MIDIPROP_TIMEDIV); 

// Here I fill my Buf "lpData" with MIDI data like that (3 DWORD per MIDI event) :

//   the event (1 DWORD) , the time stamp (1 DWORD) , the Stream ID (1 DWORD)

 

midiOutPrepareHeader( (HMIDIOUT) My_MIDIDevice, &MIDIBuf, sizeof(MIDIHDR) );
midiStreamOut( My_MIDIDevice, &MIDIBuf, sizeof(MIDIHDR) );
midiStreamRestart( My_MIDIDevice );

"

 

 

There is one thing that I'm not sure :

 1)  What must the format of the buffer be ? I fill it in this order : the event (it seem to be always 0 ??? ?), the time stamp,

      and the Stream ID. Moreover, I don't know what the Stream ID is. Is it the ID of the MIDI Device ? 

 

 

 

Thank you for your help !

See You Soon !
SEB 

 

 

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