Source code of Windows XP (NT5)
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/* Copyright (c) 1992 Microsoft Corporation */
/* callback put in separate module because must be fixed */
#define UNICODE
//MMSYSTEM
#define MMNOSOUND - Sound support
#define MMNOWAVE - Waveform support
#define MMNOAUX - Auxiliary output support
#define MMNOJOY - Joystick support
//MMDDK
#define NOWAVEDEV - Waveform support
#define NOAUXDEV - Auxiliary output support
#define NOJOYDEV - Joystick support
#include <windows.h>
#include <mmsystem.h>
#include <mmddk.h>
#include "mmsys.h"
#include "list.h"
#include "mciseq.h"
PUBLIC void FAR PASCAL _LOADDS mciSeqCallback (HANDLE h, UINT wMsg, DWORD_PTR dwInstance,
DWORD_PTR dw1, DWORD_PTR dw2)
// this function handles messages from the sequencer
{
pSeqStreamType pStream = (pSeqStreamType) dwInstance;
switch (wMsg)
{
case MIDISEQ_DONE: // sequencer is done with buff (& wants a new one)
// clear the beginning and end flags, and set the done flag
((LPMIDISEQHDR) dw1)->wFlags &= ~(MIDISEQHDR_BOT + MIDISEQHDR_EOT);
((LPMIDISEQHDR) dw1)->wFlags |= MIDISEQHDR_DONE; // set done bit
TaskSignal(pStream->streamTaskHandle, WTM_FILLBUFFER); // SIGNAL on this seq
break;
case MIDISEQ_RESET: // sequencer wants to reset the stream
StreamTrackReset(pStream, (UINT) dw1);
break;
case MIDISEQ_DONEPLAY:
TaskSignal(pStream->streamTaskHandle, WTM_DONEPLAY);
break;
}
}
/***********************************************************************/
PUBLIC void FAR PASCAL NotifyCallback(HANDLE hStream)
// Callback for all notifies from MMSEQ
{
Notify((pSeqStreamType)hStream, MCI_NOTIFY_SUCCESSFUL);
}
/*************************************************************************/
PUBLIC VOID FAR PASCAL Notify(pSeqStreamType pStream, UINT wStatus)
// notifies with cb and instance stored in pStream, with wMsg (success, abort..)
{
if (pStream->hNotifyCB) {
mciDriverNotify(pStream->hNotifyCB, pStream->wDeviceID, wStatus);
pStream->hNotifyCB = NULL; // this signifies that it has been notified
}
}