----- Original Message -----
Sent: Wednesday, September 08, 1999 9:27
AM
Subject: Programming a MIDI Player
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
