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windows-server-2003/multimedia/directx/dmusic/dmusic16/midiin.c

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/* Copyright (c) 1998-1999 Microsoft Corporation */
/*
* @Doc DMusic16
*
* @Module MIDIIn.c - Legacy MIDI capture emulation for DirectMusic |
*/
#pragma warning(disable:4704) /* Inline assembly */
#include <windows.h>
#include <mmsystem.h>
#include <stddef.h>
#include "dmusic16.h"
#include "debug.h"
#define IS_STATUS_BYTE(x) ((x) & 0x80)
#define IS_CHANNEL_MSG(x) (((x) & 0xF0) != 0xF0)
#define IS_SYSEX(x) ((x) == 0xF0)
#define SYSEX_SIZE 4096
/* (65535 - sizeof(MIDIHDR) - sizeof(EVENT) - sizeof(SEGHDR)) */
#define SYSEX_BUFFERS 8 /* Keep 2 buffers outstanding */
static unsigned cbChanMsg[16] =
{
0, 0, 0, 0, 0, 0, 0, 0, /* Running status */
3, 3, 3, 3, 2, 2, 3, 0
};
static unsigned cbSysCommData[16] =
{
1, 2, 3, 2, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1
};
VOID CALLBACK _loadds midiInProc(HMIDIIN hMidiIn, UINT wMsg, DWORD dwInstance, DWORD dwParam1, DWORD dwParam2);
STATIC BOOL NEAR PASCAL RecordShortEvent(NPOPENHANDLE poh, DWORD dwMessage, DWORD dwTime);
STATIC BOOL NEAR PASCAL RecordSysExEvent(NPOPENHANDLE poh, LPMIDIHDR lpmh, DWORD dwTime);
STATIC VOID NEAR PASCAL NotifyClientList(LPOPENHANDLE poh);
STATIC VOID NEAR PASCAL ThruClientList(LPOPENHANDLE poh, DWORD dwMessage);
STATIC VOID NEAR PASCAL RefillFreeEventList(NPOPENHANDLE poh);
STATIC VOID NEAR PASCAL MidiInFlushQueues(NPOPENHANDLE poh);
#pragma alloc_text(INIT_TEXT, MidiOutOnLoad)
#pragma alloc_text(FIX_IN_TEXT, midiInProc)
#pragma alloc_text(FIX_IN_TEXT, RecordShortEvent)
#pragma alloc_text(FIX_IN_TEXT, RecordSysExEvent)
#pragma alloc_text(FIX_IN_TEXT, NotifyClientList)
#pragma alloc_text(FIX_IN_TEXT, ThruClientList)
/* @func Called at DLL <f LibInit>
*
* @comm
*
* Currently does nothing.
*
*/
VOID PASCAL
MidiInOnLoad(VOID)
{
}
/* @func Called at DLL <f LibExit>
*
* @comm
*
* Currently does nothing
*/
VOID PASCAL
MidiInOnExit()
{
}
/* @func Open a MIDI in device
*
* @rdesc Returns one of the following:
* @flag MMSYSERR_NOERROR | on success
* @flag MMSYSERR_NOMEM | on out of memory
*
* @comm
*
* Makes sure only one client is opening the device.
*
* Opens the device and starts MIDI input on it, noting the time of the start for timestamp calculations.
*/
MMRESULT PASCAL
MidiInOnOpen(
NPOPENHANDLEINSTANCE pohi) /* @parm The open handle instance to fulfill */
{
NPOPENHANDLE poh = pohi->pHandle;
int iChannel;
MMRESULT mmr;
/* Protect here against more than one client opening an input device.
*/
if (poh->uReferenceCount > 1)
{
return MMSYSERR_ALLOCATED;
}
/* Per client initialize thruing to NULL.
*/
pohi->pThru = (NPTHRUCHANNEL)LocalAlloc(LPTR, MIDI_CHANNELS * sizeof(THRUCHANNEL));
if (pohi->pThru == NULL)
{
return MMSYSERR_NOMEM;
}
DPF(2, "MidiInOnOpen: pohi %04X pThru %04X", pohi, pohi->pThru);
for (iChannel = 0; iChannel < MIDI_CHANNELS; iChannel++)
{
pohi->pThru[iChannel].pohi = (HANDLE)NULL;
}
return MMSYSERR_NOERROR;
}
/* @func Close a MIDI in device
*
* @comm
*
* Close the device using the <f midiInClose> API.
*/
VOID PASCAL
MidiInOnClose(
NPOPENHANDLEINSTANCE pohi) /* @parm The open handle instance to close */
{
}
/* @func Activate a MIDI in device
*
* @rdesc Returns one of the following:
* @flag MMSYSERR_NOERROR | on success
* @flag MMSYSERR_ALLOCATED | if the device is already in use
*
* May also return any of the possible return codes from the <f midiInOpen> API call.
*
* @comm
*
* Opens the device and starts MIDI input on it, noting the time of the start for timestamp calculations.
*/
MMRESULT PASCAL
MidiInOnActivate(
NPOPENHANDLEINSTANCE pohi)
{
NPOPENHANDLE poh = pohi->pHandle;
MMRESULT mmr;
if (1 == poh->uActiveCount)
{
poh->wFlags &= ~OH_F_CLOSING;
mmr = midiInOpen(&poh->hmi,
poh->id,
(DWORD)midiInProc,
(DWORD)(LPOPENHANDLE)poh,
CALLBACK_FUNCTION);
if (mmr)
{
return mmr;
}
mmr = midiInStart(poh->hmi);
poh->msStartTime = timeGetTime();
if (mmr)
{
midiInClose(poh->hmi);
}
/* NOTE: poh memory is guaranteed zeroed by allocator, so we have
* no event count and NULL pointers right now.
*/
RefillFreeEventList(poh);
}
return MMSYSERR_NOERROR;
}
/* @func Deactivate a MIDI in device
*
* @comm
*
* Close the device using the <f midiInClose> API.
*/
MMRESULT PASCAL
MidiInOnDeactivate(
NPOPENHANDLEINSTANCE pohi)
{
NPOPENHANDLE poh = pohi->pHandle;
MMRESULT mmr;
if (0 == poh->uActiveCount)
{
poh->wFlags |= OH_F_CLOSING;
mmr = midiInStop(poh->hmi);
if (mmr)
{
return mmr;
}
if (MMSYSERR_NOERROR == midiInReset(poh->hmi))
{
while (poh->wPostedSysExBuffers)
{
}
}
midiInClose(poh->hmi);
MidiInFlushQueues(poh);
}
return MMSYSERR_NOERROR;
}
/* @func Set the event handle to signal
*
* @rdesc Always returns MMSYSERR_NOERROR.
*
* @comm
*
* This function is exported through the thunk layer to DMusic32.DLL
*
* This handle is already the VxD handle that can be passed to VWin32 via MMDEVLDR using
* <f SetWin32Event>.
*
* Input notification is delivered to the Win32 application using events. The application creates
* an event using the <f CreateEvent> API and gives it to the DirectMusic port. The port code
* for legacy emulation calls the undocumented Win9x kernel API <f OpenVxDHandle> to retrieve
* an equivalent event handle that is valid in any kernel context. That handle is passed to
* this function.
*
* The event handle is stored in our per-client data (<c OPENHANDLEINSTANCE>). When MIDI data
* arrives, the event will be set. This is done using MMDEVLDR, which already has semantics
* in place to do the same sort of notification for WinMM event callbacks.
*
*/
MMRESULT WINAPI
MidiInSetEventHandle(
HANDLE hMidiIn, /* @parm The handle of the input device which desires notification */
DWORD dwEvent) /* @parm The VxD handle of the event to set when new data arrives */
{
NPOPENHANDLEINSTANCE pohi;
if (!IsValidHandle(hMidiIn, VA_F_INPUT, &pohi))
{
return MMSYSERR_INVALHANDLE;
}
pohi->dwVxDEventHandle = dwEvent;
return MMSYSERR_NOERROR;
}
/* @func Read MIDI input data into a buffer
*
* @rdesc Returns one of the following
*
* @comm
*
* This function is thunked to the 32-bit DLL
*
* Take as much data from the given event list as will fit and put it into the buffer.
*/
MMRESULT WINAPI
MidiInRead(
HANDLE hMidiIn, /* @parm The handle of the input device to read */
LPBYTE lpBuffer, /* @parm A pointer to memory to pack, in DMEVENT format */
LPDWORD pcbData, /* @parm On input, the max size of <p lpBuffer> in bytes.
On return, will contain the number of bytes of data packed into the buffer */
LPDWORD pmsTime) /* @parm On return, will contain the starting time of the buffer */
{
NPOPENHANDLEINSTANCE pohi;
NPOPENHANDLE poh;
WORD wCSID;
LPEVENT pEvent;
LPEVENT pEventRemoved;
LPBYTE pbEventData;
DWORD cbLength;
DWORD cbPaddedLength;
DWORD cbLeft;
LPBYTE lpNextEvent;
LPDMEVENT pdm;
DWORD msFirst;
MMRESULT mmr;
LPMIDIHDR lpmh;
if (!IsValidHandle(hMidiIn, VA_F_INPUT, &pohi))
{
return MMSYSERR_INVALHANDLE;
}
poh = pohi->pHandle;
lpNextEvent = lpBuffer;
cbLeft = *pcbData;
wCSID = EnterCriticalSection(&poh->wCritSect, CS_BLOCKING);
assert(wCSID);
msFirst = 0;
while (NULL != (pEvent = QueuePeek(&poh->qDone)))
{
lpmh = NULL;
if (cbLeft < sizeof(DMEVENT))
{
break;
}
if (pEvent->wFlags & EVENT_F_MIDIHDR)
{
/* This event is a SysEx message starting with a MIDIHDR, which contains
* the recorded length of the message.
*/
lpmh = (LPMIDIHDR)(&pEvent->abEvent[0]);
cbLength = lpmh->dwBytesRecorded - lpmh->dwOffset;
pbEventData = lpmh->lpData + lpmh->dwOffset;
cbPaddedLength = DMEVENT_SIZE(cbLength);
/* For SysEx, split out as much as will fit if the whole message can't.
*/
if (cbPaddedLength > cbLeft)
{
cbLength = DMEVENT_DATASIZE(cbLeft);
cbPaddedLength = DMEVENT_SIZE(cbLength);
}
}
else
{
/* The data for this event is directly contained in the event.
*/
cbLength = pEvent->cbEvent;
pbEventData = &pEvent->abEvent[0];
cbPaddedLength = DMEVENT_SIZE(cbLength);
if (cbPaddedLength > cbLeft)
{
break;
}
}
assert(cbPaddedLength <= cbLeft);
pdm = (LPDMEVENT)lpNextEvent;
pdm->cbEvent = cbLength;
pdm->dwChannelGroup = 1;
pdm->dwFlags = 0;
if (msFirst)
{
QuadwordMul( pEvent->msTime - msFirst,
REFTIME_TO_MS,
&pdm->rtDelta);
}
else
{
*pmsTime = pEvent->msTime;
msFirst = pEvent->msTime;
pdm->rtDelta.dwLow = 0;
pdm->rtDelta.dwHigh = 0;
}
hmemcpy(pdm->abEvent, pbEventData, cbLength);
lpNextEvent += cbPaddedLength;
cbLeft -= cbPaddedLength;
if (lpmh)
{
lpmh->dwOffset += cbLength;
assert(lpmh->dwOffset <= lpmh->dwBytesRecorded);
if (lpmh->dwOffset == lpmh->dwBytesRecorded)
{
pEventRemoved = QueueRemoveFromFront(&poh->qDone);
assert(pEventRemoved == pEvent);
InterlockedIncrement(&poh->wPostedSysExBuffers);
lpmh->dwOffset = 0;
mmr = midiInAddBuffer(poh->hmi, (LPMIDIHDR)(&pEvent->abEvent[0]), sizeof(MIDIHDR));
if (mmr)
{
InterlockedDecrement(&poh->wPostedSysExBuffers);
DPF(0, "midiInAddBuffer failed with mmr=%d", mmr);
mmr = midiInUnprepareHeader(poh->hmi, (LPMIDIHDR)(&pEvent->abEvent[0]), sizeof(MIDIHDR));
if (mmr)
{
DPF(0, "...midiInUnprepareHeader failed too %d, memory leak!", mmr);
}
else
{
FreeEvent(pEvent);
}
}
}
}
else
{
pEventRemoved = QueueRemoveFromFront(&poh->qDone);
assert(pEventRemoved == pEvent);
QueueAppend(&poh->qFree, pEvent);
}
}
*pcbData = lpNextEvent - lpBuffer;
DPF(1, "MidiInRead: Returning %ld bytes", (DWORD)*pcbData);
LeaveCriticalSection(&poh->wCritSect);
return MMSYSERR_NOERROR;
}
/* @func Enable thruing to a MIDI output port
*
* @comm For the given channel group and channel, enable (or disable, if the
* output handle is NULL) thruing to the given output handle, channel group, and
* channel.
*/
MMRESULT WINAPI
MidiInThru(
HANDLE hMidiIn, /* @parm The handle of the input device to thru */
DWORD dwFrom, /* @parm The channel of the input stream to thru */
DWORD dwTo, /* @parm Desination channel */
HANDLE hMidiOut) /* The output handle to receive the thru'ed data. */
{
NPOPENHANDLEINSTANCE pohiInput;
NPOPENHANDLEINSTANCE pohiOutput;
if (!IsValidHandle(hMidiIn, VA_F_INPUT, &pohiInput) ||
((hMidiOut != NULL) && !IsValidHandle(hMidiOut, VA_F_OUTPUT, &pohiOutput)))
{
return MMSYSERR_INVALHANDLE;
}
/* Note that since only 1 channel group is supported on legacy drivers,
* we don't need any channel group information.
*/
if (dwFrom > 15 || dwTo > 15)
{
return MMSYSERR_INVALPARAM;
}
DPF(1, "Thru: Sending <%04X,%u> to <%04X,%u>",
(WORD)hMidiIn, (UINT)dwFrom, (WORD)hMidiOut, (UINT)dwTo);
pohiInput->pThru[(WORD)dwFrom].wChannel = (WORD)dwTo;
pohiInput->pThru[(WORD)dwFrom].pohi = hMidiOut ? pohiOutput : NULL;
return MMSYSERR_NOERROR;
}
/* @func MIDI in data callback
*
* @comm
*
* This is a standard MIDI input callback from MMSYSYTEM. It calls the correct record routine
* and notifies the client that data has arrived.
*
* For a description of event notification of clients, see <f MidiInSetEventHandle>.
*/
VOID CALLBACK _loadds
midiInProc(
HMIDIIN hMidiIn, /* @parm The MMSYSTEM handle of the device which received data */
UINT wMsg, /* @parm The type of callback */
DWORD dwInstance, /* @parm Instance data; in our case, a pointer to an <c OPENHANDLE> matching <p hMidiIn> */
DWORD dwParam1, /* @parm Message-specific parameters */
DWORD dwParam2) /* @parm Message-specific parameters */
{
NPOPENHANDLE poh = (NPOPENHANDLE)(WORD)dwInstance;
BOOL bIsNewData = FALSE;
WORD wCSID;
/* If we can get the critical section we can do all sorts of fun stuff like
* transfer the lists over.
*/
wCSID = EnterCriticalSection(&poh->wCritSect, CS_NONBLOCKING);
if (wCSID)
{
/* We now have exclusive access to all the queues.
*
* Move any new free events into our internal free list.
*/
QueueCat(&poh->qFreeCB, &poh->qFree);
}
switch(wMsg)
{
case MIM_DATA:
DPF(1, "MIM_DATA %08lX %08lX", dwParam1, dwParam2);
bIsNewData = RecordShortEvent(poh, dwParam1, dwParam2);
break;
case MIM_LONGDATA:
DPF(1, "MIM_LONGDATA %08lX %08lX", dwParam1, dwParam2);
bIsNewData = RecordSysExEvent(poh, (LPMIDIHDR)dwParam1, dwParam2);
break;
default:
break;
}
if (wCSID)
{
/* It's safe to move events over to the shared list.
*/
QueueCat(&poh->qDone, &poh->qDoneCB);
LeaveCriticalSection(&poh->wCritSect);
}
/* Let clients know there is new data
*/
if (bIsNewData && (!(poh->wFlags & OH_F_CLOSING)))
{
NotifyClientList(poh);
}
}
/* @func Record a short message (channel messsage or system message).
*
* @comm
*
* Queue the incoming data as quickly as possible.
*
* For a description of the queues used for incoming data, see the <c OPENHANDLE> struct.
*
* @rdesc
* Returns TRUE if the data was successfully recorded; FALSE otherwise.
*/
STATIC BOOL NEAR PASCAL
RecordShortEvent(
NPOPENHANDLE poh, /* @parm The handle to record this data to */
DWORD dwMessage, /* @parm The short message to record */
DWORD dwTime) /* @parm The time stamp of the message */
{
LPEVENT pEvent;
LPBYTE pb;
BYTE b;
pEvent = QueueRemoveFromFront(&poh->qFreeCB);
if (pEvent == NULL)
{
DPF(0, "midiInProc: Missed a short event!!!");
return FALSE;
}
pEvent->msTime = poh->msStartTime + dwTime;
pEvent->wFlags = 0;
/* Now we have to parse and rebuild the channel message.
*
* NOTE: Endian specific code ahead
*/
pb = (LPBYTE)&dwMessage;
assert(!IS_SYSEX(*pb)); /* This should *always* be in MIM_LONGDATA */
assert(IS_STATUS_BYTE(*pb)); /* API guarantees no running status */
/* Copying over all the bytes is harmless (we have a DWORD in both
* source and dest) and is faster than checking to see if we have to.
*/
b = pEvent->abEvent[0] = *pb++;
pEvent->abEvent[1] = *pb++;
pEvent->abEvent[2] = *pb++;
if (IS_CHANNEL_MSG(b))
{
/* 8x, 9x, Ax, Bx, Cx, Dx, Ex */
/* 0x..7x invalid, that would need running status */
/* Fx handled below */
pEvent->cbEvent = cbChanMsg[(b >> 4) & 0x0F];
/* This is also our criteria for thruing
*/
ThruClientList(poh, dwMessage);
}
else
{
/* F1..FF */
/* F0 is sysex, should never see it here */
pEvent->cbEvent = cbSysCommData[b & 0x0F];
}
/* Now we have something to save
*/
QueueAppend(&poh->qDoneCB, pEvent);
return TRUE;
}
/* @func Record a SysEx message.
*
* @comm
*
* Queue the incoming data as quickly as possible.
*
* For a description of the queues used for incoming data, see the <c OPENHANDLE> struct.
*
* @rdesc
* Returns TRUE if the data was successfully recorded; FALSE otherwise.
*/
STATIC BOOL NEAR PASCAL
RecordSysExEvent(
NPOPENHANDLE poh, /* @parm The handle to record this data to */
LPMIDIHDR lpmh, /* @parm The SysEx message to record */
DWORD dwTime) /* @parm The time stamp of the message */
{
LPEVENT pEvent;
/* Get back the event header for this MIDIHDR. While buffers are in MMSYSTEM, they are not
* in any queue.
*/
InterlockedDecrement(&poh->wPostedSysExBuffers);
/* dwOffset in the MIDIHDR is used to indicate the start of data to send
* up to Win32. It is incremented by MidiInRead until the buffer has been
* emptied, at which time it will be put back into the pool.
*/
lpmh->dwOffset = 0;
pEvent = (LPEVENT)(lpmh->dwUser);
pEvent->msTime = poh->msStartTime + dwTime;
QueueAppend(&poh->qDoneCB, pEvent);
return TRUE;
}
/* @func Notify all clients of a device that data has arrived.
*
* @comm
*
* Walks the list of clients for the device and sets the notification event for each one.
*
* This function is now overkill since we no longer support multiple input clients per device.
*/
STATIC VOID NEAR PASCAL
NotifyClientList(
LPOPENHANDLE poh) /* @parm The handle of the device that has received data */
{
NPLINKNODE plink;
NPOPENHANDLEINSTANCE pohi;
for (plink = poh->pInstanceList; plink; plink = plink->pNext)
{
pohi = (NPOPENHANDLEINSTANCE)(((PBYTE)plink) - offsetof(OPENHANDLEINSTANCE, linkHandleList));
if (!pohi->dwVxDEventHandle)
{
/* No notification event registered for this handle yet.
*/
continue;
}
SetWin32Event(pohi->dwVxDEventHandle);
}
}
/* @func Thru this message based on the settings of all clients of a device.
*
* @comm
*
* Walks the list of clients for the device and looks at the thru settings of each one.
*
* This function is now overkill since we no longer support multiple input clients per device.
*/
STATIC VOID NEAR PASCAL
ThruClientList(
LPOPENHANDLE poh,
DWORD dwMessage)
{
NPLINKNODE plink;
NPOPENHANDLEINSTANCE pohi;
NPOPENHANDLEINSTANCE pohiDest;
int iChannel;
iChannel = (int)(dwMessage & 0x0000000Fl);
dwMessage &= 0xFFFFFFF0l;
for (plink = poh->pInstanceList; plink; plink = plink->pNext)
{
pohi = (NPOPENHANDLEINSTANCE)(((PBYTE)plink) - offsetof(OPENHANDLEINSTANCE, linkHandleList));
pohiDest = pohi->pThru[iChannel].pohi;
if (pohiDest == NULL || !pohiDest->fActive)
{
continue;
}
MidiOutThru(pohiDest,
dwMessage & 0xFFFFFFF0l | pohi->pThru[iChannel].wChannel);
}
}
/* @func Refill the free lists
*
* @comm
*
* This function is called periodically from user mode to ensure that there are enough free
* events available for the input callback.
*/
VOID PASCAL
MidiInRefillFreeLists(VOID)
{
NPLINKNODE plink;
NPOPENHANDLE poh;
for (plink = gOpenHandleList;
(poh = (NPOPENHANDLE)plink) != NULL;
plink = plink->pNext)
{
/* Only refill MIDI in devices which are not in the process of closing
*/
if ((poh->wFlags & (OH_F_MIDIIN | OH_F_CLOSING)) != OH_F_MIDIIN)
{
continue;
}
RefillFreeEventList(poh);
}
}
/* @func Terminate thruing to this output handle
*
* @comm
*
* This function is called before the given output handle is closed.
*/
VOID PASCAL
MidiInUnthruToInstance(
NPOPENHANDLEINSTANCE pohiClosing) /* @parm NPOPENHANDLE | pohClosing |
The handle which is closing. */
{
NPLINKNODE plink;
NPOPENHANDLE poh;
NPLINKNODE plinkInstance;
NPOPENHANDLEINSTANCE pohiInstance;
int iChannel;
for (plink = gOpenHandleList; (poh = (NPOPENHANDLE)plink) != NULL; plink = plink->pNext)
{
DPF(2, "Unthru: poh <%04X>", (WORD)poh);
if (!(poh->wFlags & OH_F_MIDIIN))
{
DPF(2, "...not input");
continue;
}
for (plinkInstance = poh->pInstanceList; plinkInstance; plinkInstance = plinkInstance->pNext)
{
pohiInstance = (NPOPENHANDLEINSTANCE)(((PBYTE)plinkInstance) - offsetof(OPENHANDLEINSTANCE, linkHandleList));
DPF(2, "pohiInstance <%04X>", (WORD)pohiInstance);
for (iChannel = 0; iChannel < MIDI_CHANNELS; iChannel++)
{
DPF(2, "Channel 0 @ <%04X>", (WORD)&pohiInstance->pThru[iChannel]);
if (pohiInstance->pThru[iChannel].pohi == pohiClosing)
{
DPF(1, "Thru: Closing output handle %04X which is in use!", (WORD)pohiClosing);
pohiInstance->pThru[iChannel].pohi = NULL;
}
}
}
}
}
/* @func Allocate enough free events to refill the pool to CAP_HIGHWATERMARK
*
* @comm
*
* BUGBUG call this on a window timer callback
*
*/
STATIC VOID NEAR PASCAL
RefillFreeEventList(
NPOPENHANDLE poh) /* @parm The device to refill the free list of */
{
int idx;
LPEVENT pEvent;
UINT cFree;
WORD wCSID;
QUADWORD rt = {0, 0};
int cNewBuffers;
LPMIDIHDR lpmh;
MMRESULT mmr;
WORD wIntStat;
wCSID = EnterCriticalSection(&poh->wCritSect, CS_BLOCKING);
assert(wCSID);
/* NOTE: Technically not allowed to access qFreeCB here, but this is an approximation
*/
cFree = poh->qFree.cEle + poh->qFreeCB.cEle;
if (cFree < CAP_HIGHWATERMARK)
{
DPF(1, "RefillFreeEventList poh %.4x free %u highwater %u",
(WORD)poh,
(UINT)cFree,
(UINT)CAP_HIGHWATERMARK);
for (idx = CAP_HIGHWATERMARK - cFree; idx; --idx)
{
pEvent = AllocEvent(0, rt, sizeof(DWORD));
if (NULL == pEvent)
{
DPF(0, "AllocEvent returned NULL in RefillFreeEventList");
break;
}
QueueAppend(&poh->qFree, pEvent);
}
}
LeaveCriticalSection(&poh->wCritSect);
if (poh->wPostedSysExBuffers < SYSEX_BUFFERS)
{
for (idx = SYSEX_BUFFERS - cFree; idx; --idx)
{
pEvent = AllocEvent(0, rt, sizeof(MIDIHDR) + SYSEX_SIZE);
if (NULL == pEvent)
{
break;
}
pEvent->wFlags |= EVENT_F_MIDIHDR;
lpmh = (LPMIDIHDR)(&pEvent->abEvent[0]);
lpmh->lpData = (LPSTR)(lpmh + 1);
lpmh->dwBufferLength = SYSEX_SIZE;
lpmh->dwUser = (DWORD)pEvent;
mmr = midiInPrepareHeader(poh->hmi, lpmh, sizeof(MIDIHDR));
if (mmr)
{
DPF(0, "midiInPrepareHeader: %u\n", mmr);
FreeEvent(pEvent);
break;
}
InterlockedIncrement(&poh->wPostedSysExBuffers);
mmr = midiInAddBuffer(poh->hmi, lpmh, sizeof(MIDIHDR));
if (mmr)
{
InterlockedDecrement(&poh->wPostedSysExBuffers);
DPF(0, "midiInAddBuffer: %u\n", mmr);
midiInUnprepareHeader(poh->hmi, lpmh, sizeof(MIDIHDR));
FreeEvent(pEvent);
break;
}
}
}
}
/* @func Return all memory from all queues to the free event list.
*
* @comm
*
*/
STATIC VOID NEAR PASCAL
MidiInFlushQueues(
NPOPENHANDLE poh)
{
WORD wCSID;
wCSID = EnterCriticalSection(&poh->wCritSect, CS_BLOCKING);
assert(wCSID);
FreeAllQueueEvents(&poh->qDone);
FreeAllQueueEvents(&poh->qDoneCB);
FreeAllQueueEvents(&poh->qFree);
FreeAllQueueEvents(&poh->qFreeCB);
LeaveCriticalSection(&poh->wCritSect);
}
/* @func Free all events in the given event queue.
*
* @comm
*
* Assumes that the queue's critical section has already been taken by the caller.
*
*/
VOID PASCAL
FreeAllQueueEvents(
NPEVENTQUEUE peq)
{
LPEVENT lpCurr;
LPEVENT lpNext;
lpCurr = peq->pHead;
while (lpCurr)
{
lpNext = lpCurr->lpNext;
FreeEvent(lpCurr);
lpCurr = lpNext;
}
peq->pHead = peq->pTail = NULL;
peq->cEle = 0;
}