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windows-server-2003/multimedia/directx/dmusic/dmime/tsigtrk.cpp

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// Copyright (c) 1998-1999 Microsoft Corporation
// READ THIS!!!!!!!!!!!!!!!!!!!!!!!!!!!
//
// 4530: C++ exception handler used, but unwind semantics are not enabled. Specify -GX
//
// We disable this because we use exceptions and do *not* specify -GX (USE_NATIVE_EH in
// sources).
//
// The one place we use exceptions is around construction of objects that call
// InitializeCriticalSection. We guarantee that it is safe to use in this case with
// the restriction given by not using -GX (automatic objects in the call chain between
// throw and handler are not destructed). Turning on -GX buys us nothing but +10% to code
// size because of the unwind code.
//
// Any other use of exceptions must follow these restrictions or -GX must be turned on.
//
// READ THIS!!!!!!!!!!!!!!!!!!!!!!!!!!!
//
#pragma warning(disable:4530)
// TimeSigTrk.cpp : Implementation of CTimeSigTrack
#include "dmime.h"
#include "TSigTrk.h"
#include "dmusici.h"
#include "dmusicf.h"
#include "debug.h"
#include "..\shared\dmstrm.h"
#include "..\shared\Validate.h"
#include "debug.h"
#define ASSERT assert
CTimeSigItem::CTimeSigItem()
{
m_TimeSig.lTime = 0;
m_TimeSig.bBeatsPerMeasure = 0;
m_TimeSig.bBeat = 0;
m_TimeSig.wGridsPerBeat = 0;
}
/////////////////////////////////////////////////////////////////////////////
// CTimeSigTrack
void CTimeSigTrack::Construct()
{
InterlockedIncrement(&g_cComponent);
m_cRef = 1;
m_fCSInitialized = FALSE;
InitializeCriticalSection(&m_CrSec);
m_fCSInitialized = TRUE;
m_dwValidate = 0;
m_fNotificationMeasureBeat = FALSE;
}
CTimeSigTrack::CTimeSigTrack()
{
Construct();
m_fActive = TRUE;
m_fStateSetBySetParam = FALSE;
}
CTimeSigTrack::CTimeSigTrack(
CTimeSigTrack *pSourceTrack, MUSIC_TIME mtStart, MUSIC_TIME mtEnd)
{
Construct();
m_fActive = pSourceTrack->m_fActive;
m_fStateSetBySetParam = pSourceTrack->m_fStateSetBySetParam;
// Clone the time signature list.
CTimeSigItem* pScan = pSourceTrack->m_TSigEventList.GetHead();
CTimeSigItem* pPrevious = NULL;
for(; pScan; pScan = pScan->GetNext())
{
if (pScan->m_TimeSig.lTime < mtStart)
{
pPrevious = pScan;
}
else if (pScan->m_TimeSig.lTime < mtEnd)
{
if (pScan->m_TimeSig.lTime == mtStart)
{
pPrevious = NULL;
}
CTimeSigItem* pNew = new CTimeSigItem;
if (pNew)
{
pNew->m_TimeSig = pScan->m_TimeSig;
pNew->m_TimeSig.lTime = pScan->m_TimeSig.lTime - mtStart;
m_TSigEventList.AddHead(pNew); // instead of AddTail, which is n^2. We reverse below.
}
}
else break;
}
m_TSigEventList.Reverse(); // Now, put list in order.
// Then, install the time signature that precedes the clone.
if (pPrevious)
{
CTimeSigItem* pNew = new CTimeSigItem;
if (pNew)
{
pNew->m_TimeSig = pPrevious->m_TimeSig;
pNew->m_TimeSig.lTime = 0;
m_TSigEventList.AddHead(pNew);
}
}
}
void CTimeSigTrack::Clear()
{
CTimeSigItem* pItem;
while( pItem = m_TSigEventList.RemoveHead() )
{
delete pItem;
}
}
CTimeSigTrack::~CTimeSigTrack()
{
Clear();
if (m_fCSInitialized)
{
DeleteCriticalSection(&m_CrSec);
}
InterlockedDecrement(&g_cComponent);
}
// @method:(EXTERNAL) HRESULT | IDirectMusicTimeSigTrack | QueryInterface | Standard QueryInterface implementation for <i IDirectMusicTimeSigTrack>
//
// @parm const IID & | iid | Interface to query for
// @parm void ** | ppv | The requested interface will be returned here
//
// @rdesc Returns one of the following:
//
// @flag S_OK | If the interface is supported and was returned
// @flag E_NOINTERFACE | If the object does not support the given interface.
//
// @mfunc:(INTERNAL)
//
//
STDMETHODIMP CTimeSigTrack::QueryInterface(
const IID &iid, // @parm Interface to query for
void **ppv) // @parm The requested interface will be returned here
{
V_INAME(CTimeSigTrack::QueryInterface);
V_PTRPTR_WRITE(ppv);
V_REFGUID(iid);
if (iid == IID_IUnknown || iid == IID_IDirectMusicTrack)
{
*ppv = static_cast<IDirectMusicTrack*>(this);
} else
if (iid == IID_IPersistStream)
{
*ppv = static_cast<IPersistStream*>(this);
} else
{
*ppv = NULL;
Trace(4,"Warning: Request to query unknown interface on Time Signature Track\n");
return E_NOINTERFACE;
}
reinterpret_cast<IUnknown*>(this)->AddRef();
return S_OK;
}
// @method:(EXTERNAL) HRESULT | IDirectMusicTimeSigTrack | AddRef | Standard AddRef implementation for <i IDirectMusicTimeSigTrack>
//
// @rdesc Returns the new reference count for this object.
//
// @mfunc:(INTERNAL)
//
//
STDMETHODIMP_(ULONG) CTimeSigTrack::AddRef()
{
return InterlockedIncrement(&m_cRef);
}
// @method:(EXTERNAL) HRESULT | IDirectMusicTimeSigTrack | Release | Standard Release implementation for <i IDirectMusicTimeSigTrack>
//
// @rdesc Returns the new reference count for this object.
//
// @mfunc:(INTERNAL)
//
//
STDMETHODIMP_(ULONG) CTimeSigTrack::Release()
{
if (!InterlockedDecrement(&m_cRef))
{
delete this;
return 0;
}
return m_cRef;
}
/////////////////////////////////////////////////////////////////////////////
// IPersist
HRESULT CTimeSigTrack::GetClassID( CLSID* pClassID )
{
V_INAME(CTimeSigTrack::GetClassID);
V_PTR_WRITE(pClassID, CLSID);
*pClassID = CLSID_DirectMusicTimeSigTrack;
return S_OK;
}
/////////////////////////////////////////////////////////////////////////////
// IPersistStream functions
HRESULT CTimeSigTrack::IsDirty()
{
return S_FALSE;
}
/*
@method HRESULT | ITimeSigTrack | Load |
Call this with an IStream filled with DMUS_IO_TIMESIGNATURE_ITEM's, sorted in time order.
@parm IStream* | pIStream |
A stream of DMUS_IO_TIMESIGNATURE_ITEM's, sorted in time order. The seek pointer should be
set to the first event. The stream should only contain TimeSig events and
nothing more.
@rvalue E_INVALIDARG | If pIStream == NULL
@rvalue S_OK
@comm The <p pIStream> will be AddRef'd inside this function and held
until the TimeSigTrack is released.
*/
HRESULT CTimeSigTrack::Load( IStream* pIStream )
{
V_INAME(CTimeSigTrack::Load);
V_INTERFACE(pIStream);
CRiffParser Parser(pIStream);
EnterCriticalSection(&m_CrSec);
m_dwValidate++; // used to validate state data that's out there
RIFFIO ckMain;
HRESULT hr = S_OK;
Parser.EnterList(&ckMain);
if (Parser.NextChunk(&hr))
{
if (ckMain.ckid == DMUS_FOURCC_TIMESIG_CHUNK)
{
hr = LoadTimeSigList(&Parser,ckMain.cksize);
}
else if ((ckMain.ckid == FOURCC_LIST) &&
(ckMain.fccType == DMUS_FOURCC_TIMESIGTRACK_LIST))
{
Clear();
RIFFIO ckNext; // Descends into the children chunks.
Parser.EnterList(&ckNext);
while (Parser.NextChunk(&hr))
{
switch(ckNext.ckid)
{
case DMUS_FOURCC_TIMESIG_CHUNK :
hr = LoadTimeSigList(&Parser,ckNext.cksize);
break;
}
}
Parser.LeaveList();
}
else
{
Trace(1,"Error: Failure reading bad data in time signature track.\n");
hr = DMUS_E_CHUNKNOTFOUND;
}
}
LeaveCriticalSection(&m_CrSec);
return hr;
}
HRESULT CTimeSigTrack::LoadTimeSigList( CRiffParser *pParser, long lChunkSize )
{
HRESULT hr;
// copy contents of the stream into the list.
DWORD dwSubSize;
// read in the size of the data structures
hr = pParser->Read( &dwSubSize, sizeof(DWORD));
if (SUCCEEDED(hr))
{
lChunkSize -= sizeof(DWORD);
DWORD dwRead, dwSeek;
if( dwSubSize > sizeof(DMUS_IO_TIMESIGNATURE_ITEM) )
{
dwRead = sizeof(DMUS_IO_TIMESIGNATURE_ITEM);
dwSeek = dwSubSize - dwRead;
}
else
{
dwRead = dwSubSize;
dwSeek = 0;
}
if( 0 == dwRead )
{
Trace(1,"Error: Failure reading time signature track.\n");
hr = DMUS_E_CANNOTREAD;
}
else
{
while( lChunkSize > 0 )
{
CTimeSigItem *pNew = new CTimeSigItem;
if (pNew)
{
if( FAILED( pParser->Read( &pNew->m_TimeSig, dwRead )))
{
delete pNew;
hr = DMUS_E_CANNOTREAD;
break;
}
// make sure this time sig is OK
if (!pNew->m_TimeSig.bBeatsPerMeasure)
{
Trace(1, "Warning: invalid content: DMUS_IO_TIMESIGNATURE_ITEM.bBeatsPerMeasure\n");
pNew->m_TimeSig.bBeatsPerMeasure = 4;
}
if (!pNew->m_TimeSig.bBeat)
{
Trace(1, "Warning: invalid content: DMUS_IO_TIMESIGNATURE_ITEM.bBeat\n");
pNew->m_TimeSig.bBeat = 4;
}
if (!pNew->m_TimeSig.wGridsPerBeat)
{
Trace(1, "Warning: invalid content: DMUS_IO_TIMESIGNATURE_ITEM.wGridsPerBeat\n");
pNew->m_TimeSig.wGridsPerBeat = 4;
}
m_TSigEventList.AddHead(pNew);
lChunkSize -= dwRead;
if( dwSeek )
{
if( FAILED( pParser->Skip(dwSeek)))
{
hr = DMUS_E_CANNOTSEEK;
break;
}
lChunkSize -= dwSeek;
}
}
}
m_TSigEventList.Reverse();
// If there is no time signature at the start, make a copy of the
// first time signature and stick it there. This resolves a bug in 6.1
// where notification messages and GetParam() were inconsistent
// in their behavior under this circumstance. This ensures they behave
// the same.
CTimeSigItem *pTop = m_TSigEventList.GetHead();
if (pTop && (pTop->m_TimeSig.lTime > 0))
{
CTimeSigItem *pCopy = new CTimeSigItem;
if (pCopy)
{
*pCopy = *pTop;
pCopy->m_TimeSig.lTime = 0;
m_TSigEventList.AddHead(pCopy);
}
}
}
}
return hr;
}
HRESULT CTimeSigTrack::Save( IStream* pIStream, BOOL fClearDirty )
{
return E_NOTIMPL;
}
HRESULT CTimeSigTrack::GetSizeMax( ULARGE_INTEGER FAR* pcbSize )
{
return E_NOTIMPL;
}
// IDirectMusicTrack
HRESULT STDMETHODCALLTYPE CTimeSigTrack::IsParamSupported(
/* [in] */ REFGUID rguid)
{
V_INAME(CTimeSigTrack::IsParamSupported);
V_REFGUID(rguid);
if (m_fStateSetBySetParam)
{
if( m_fActive )
{
if( rguid == GUID_DisableTimeSig ) return S_OK;
if( rguid == GUID_TimeSignature ) return S_OK;
if( rguid == GUID_EnableTimeSig ) return DMUS_E_TYPE_DISABLED;
}
else
{
if( rguid == GUID_EnableTimeSig ) return S_OK;
if( rguid == GUID_DisableTimeSig ) return DMUS_E_TYPE_DISABLED;
if( rguid == GUID_TimeSignature ) return DMUS_E_TYPE_DISABLED;
}
}
else
{
if(( rguid == GUID_DisableTimeSig ) ||
( rguid == GUID_TimeSignature ) ||
( rguid == GUID_EnableTimeSig )) return S_OK;
}
return DMUS_E_TYPE_UNSUPPORTED;
}
//////////////////////////////////////////////////////////////////////
// IDirectMusicTrack::Init
HRESULT CTimeSigTrack::Init(
/* [in] */ IDirectMusicSegment *pSegment)
{
return S_OK;
}
HRESULT CTimeSigTrack::InitPlay(
/* [in] */ IDirectMusicSegmentState *pSegmentState,
/* [in] */ IDirectMusicPerformance *pPerformance,
/* [out] */ void **ppStateData,
/* [in] */ DWORD dwTrackID,
/* [in] */ DWORD dwFlags)
{
V_INAME(IDirectMusicTrack::InitPlay);
V_PTRPTR_WRITE(ppStateData);
V_INTERFACE(pSegmentState);
V_INTERFACE(pPerformance);
EnterCriticalSection(&m_CrSec);
CTimeSigStateData* pStateData;
pStateData = new CTimeSigStateData;
if( NULL == pStateData )
return E_OUTOFMEMORY;
*ppStateData = pStateData;
if (m_fStateSetBySetParam)
{
pStateData->m_fActive = m_fActive;
}
else
{
pStateData->m_fActive = !(dwFlags & (DMUS_SEGF_CONTROL | DMUS_SEGF_SECONDARY));
}
pStateData->m_dwVirtualTrackID = dwTrackID;
pStateData->m_pPerformance = pPerformance; // weak reference, no addref.
pStateData->m_pSegState = pSegmentState; // weak reference, no addref.
pStateData->m_pCurrentTSig = m_TSigEventList.GetHead();
pStateData->m_dwValidate = m_dwValidate;
LeaveCriticalSection(&m_CrSec);
return S_OK;
}
HRESULT CTimeSigTrack::EndPlay(
/* [in] */ void *pStateData)
{
ASSERT( pStateData );
if( pStateData )
{
V_INAME(CTimeSigTrack::EndPlay);
V_BUFPTR_WRITE(pStateData, sizeof(CTimeSigStateData));
CTimeSigStateData* pSD = (CTimeSigStateData*)pStateData;
delete pSD;
}
return S_OK;
}
HRESULT CTimeSigTrack::Play(
/* [in] */ void *pStateData,
/* [in] */ MUSIC_TIME mtStart,
/* [in] */ MUSIC_TIME mtEnd,
/* [in] */ MUSIC_TIME mtOffset,
DWORD dwFlags,
IDirectMusicPerformance* pPerf,
IDirectMusicSegmentState* pSegSt,
DWORD dwVirtualID
)
{
V_INAME(IDirectMusicTrack::Play);
V_BUFPTR_WRITE( pStateData, sizeof(CTimeSigStateData));
V_INTERFACE(pPerf);
V_INTERFACE(pSegSt);
EnterCriticalSection(&m_CrSec);
HRESULT hr = S_OK;
IDirectMusicGraph* pGraph = NULL;
DMUS_TIMESIG_PMSG* pTimeSig;
CTimeSigStateData* pSD = (CTimeSigStateData*)pStateData;
MUSIC_TIME mtNotification = mtStart;
BOOL fSeek = (dwFlags & DMUS_TRACKF_SEEK) ? TRUE : FALSE;
// if mtStart is 0 and dwFlags contains DMUS_TRACKF_START, we want to be sure to
// send out any negative time events. So, we'll set mtStart to -768.
if( (mtStart == 0) && ( dwFlags & DMUS_TRACKF_START ))
{
mtStart = -768;
}
if( pSD->m_dwValidate != m_dwValidate )
{
pSD->m_dwValidate = m_dwValidate;
pSD->m_pCurrentTSig = NULL;
}
// if the previous end time isn't the same as the current start time,
// we need to seek to the right position.
if( fSeek || ( pSD->m_mtPrevEnd != mtStart ))
{
if( dwFlags & (DMUS_TRACKF_START | DMUS_TRACKF_LOOP) )
{
Seek( pStateData, mtStart, TRUE );
}
else
{
Seek( pStateData, mtStart, FALSE );
}
}
pSD->m_mtPrevEnd = mtEnd;
if( NULL == pSD->m_pCurrentTSig )
{
pSD->m_pCurrentTSig = m_TSigEventList.GetHead();
}
if( FAILED( pSD->m_pSegState->QueryInterface( IID_IDirectMusicGraph,
(void**)&pGraph )))
{
pGraph = NULL;
}
for( ; pSD->m_pCurrentTSig; pSD->m_pCurrentTSig = pSD->m_pCurrentTSig->GetNext() )
{
DMUS_IO_TIMESIGNATURE_ITEM *pItem = &pSD->m_pCurrentTSig->m_TimeSig;
if( pItem->lTime >= mtEnd )
{
break;
}
if( (pItem->lTime < mtStart) && !fSeek )
{
break;
}
if( pSD->m_fActive && !(dwFlags & DMUS_TRACKF_PLAY_OFF) && SUCCEEDED( pSD->m_pPerformance->AllocPMsg( sizeof(DMUS_TIMESIG_PMSG),
(DMUS_PMSG**)&pTimeSig )))
{
if( pItem->lTime < mtStart )
{
// this only happens in the case where we've puposefully seeked
// and need to time stamp this event with the start time
pTimeSig->mtTime = mtStart + mtOffset;
}
else
{
pTimeSig->mtTime = pItem->lTime + mtOffset;
}
pTimeSig->bBeatsPerMeasure = pItem->bBeatsPerMeasure;
pTimeSig->bBeat = pItem->bBeat;
pTimeSig->wGridsPerBeat = pItem->wGridsPerBeat;
pTimeSig->dwFlags |= DMUS_PMSGF_MUSICTIME;
pTimeSig->dwVirtualTrackID = pSD->m_dwVirtualTrackID;
pTimeSig->dwType = DMUS_PMSGT_TIMESIG;
pTimeSig->dwGroupID = 0xffffffff;
if( pGraph )
{
pGraph->StampPMsg( (DMUS_PMSG*)pTimeSig );
}
TraceI(3, "TimeSigtrk: TimeSig event\n");
if(FAILED(pSD->m_pPerformance->SendPMsg( (DMUS_PMSG*)pTimeSig )))
{
pSD->m_pPerformance->FreePMsg( (DMUS_PMSG*)pTimeSig );
}
}
if( pSD->m_fActive && m_fNotificationMeasureBeat && !(dwFlags & DMUS_TRACKF_NOTIFY_OFF))
{
// create beat and measure notifications for up to this time
if (mtNotification < pItem->lTime)
{
mtNotification = NotificationMeasureBeat( mtNotification, pItem->lTime, pSD, mtOffset );
}
}
// set the state data to the new beat and beats per measure, and time
pSD->m_bBeat = pItem->bBeat;
pSD->m_bBeatsPerMeasure = pItem->bBeatsPerMeasure;
pSD->m_mtTimeSig = pItem->lTime;
}
if( pSD->m_fActive && m_fNotificationMeasureBeat && ( mtNotification < mtEnd )
&& !(dwFlags & DMUS_TRACKF_NOTIFY_OFF))
{
NotificationMeasureBeat( mtNotification, mtEnd, pSD, mtOffset );
}
if( pGraph )
{
pGraph->Release();
}
LeaveCriticalSection(&m_CrSec);
return hr;
}
// seeks to the time sig. just before mtTime.
HRESULT CTimeSigTrack::Seek(
/* [in] */ void *pStateData,
/* [in] */ MUSIC_TIME mtTime, BOOL fGetPrevious)
{
CTimeSigStateData* pSD = (CTimeSigStateData*)pStateData;
if( m_TSigEventList.IsEmpty() )
{
return S_FALSE;
}
if( NULL == pSD->m_pCurrentTSig )
{
pSD->m_pCurrentTSig = m_TSigEventList.GetHead();
}
// if the current event's time is on or past mtTime, we need to rewind to the beginning
if( pSD->m_pCurrentTSig->m_TimeSig.lTime >= mtTime )
{
pSD->m_pCurrentTSig = m_TSigEventList.GetHead();
}
// now start seeking until we find an event with time on or past mtTime
CTimeSigItem* pTSig;
for( pTSig = pSD->m_pCurrentTSig; pTSig ; pTSig = pTSig->GetNext() )
{
if( pTSig->m_TimeSig.lTime >= mtTime )
{
break;
}
pSD->m_pCurrentTSig = pTSig;
}
if( !fGetPrevious && pSD->m_pCurrentTSig )
{
pSD->m_pCurrentTSig = pSD->m_pCurrentTSig->GetNext();
}
return S_OK;
}
HRESULT CTimeSigTrack::GetParam(
REFGUID rguid,
MUSIC_TIME mtTime,
MUSIC_TIME* pmtNext,
void *pData)
{
V_INAME(CTimeSigTrack::GetParam);
V_PTR_WRITE_OPT(pmtNext,MUSIC_TIME);
V_REFGUID(rguid);
HRESULT hr = DMUS_E_GET_UNSUPPORTED;
EnterCriticalSection(&m_CrSec);
if( NULL == pData )
{
hr = E_POINTER;
}
else if( GUID_TimeSignature == rguid )
{
if( !m_fActive )
{
hr = DMUS_E_TYPE_DISABLED;
}
else
{
DMUS_TIMESIGNATURE* pTSigData = (DMUS_TIMESIGNATURE*)pData;
CTimeSigItem* pScan = m_TSigEventList.GetHead();
CTimeSigItem* pPrevious = pScan;
if (pScan)
{
for (; pScan; pScan = pScan->GetNext())
{
if (pScan->m_TimeSig.lTime > mtTime)
{
break;
}
pPrevious = pScan;
}
pTSigData->mtTime = pPrevious->m_TimeSig.lTime - mtTime;
pTSigData->bBeatsPerMeasure = pPrevious->m_TimeSig.bBeatsPerMeasure;
pTSigData->bBeat = pPrevious->m_TimeSig.bBeat;
pTSigData->wGridsPerBeat = pPrevious->m_TimeSig.wGridsPerBeat;
if (pmtNext)
{
*pmtNext = 0;
}
if (pScan)
{
if (pmtNext)
{
*pmtNext = pScan->m_TimeSig.lTime - mtTime;
}
}
hr = S_OK;
}
else
{
hr = DMUS_E_NOT_FOUND;
}
}
}
LeaveCriticalSection(&m_CrSec);
return hr;
}
HRESULT CTimeSigTrack::SetParam(
REFGUID rguid,
MUSIC_TIME mtTime,
void *pData)
{
V_INAME(CTimeSigTrack::SetParam);
V_REFGUID(rguid);
HRESULT hr = DMUS_E_SET_UNSUPPORTED;
if( rguid == GUID_EnableTimeSig )
{
if (m_fStateSetBySetParam && m_fActive)
{ // Already been enabled.
hr = DMUS_E_TYPE_DISABLED;
}
else
{
m_fStateSetBySetParam = TRUE;
m_fActive = TRUE;
hr = S_OK;
}
}
else if( rguid == GUID_DisableTimeSig )
{
if (m_fStateSetBySetParam && !m_fActive)
{ // Already been disabled.
hr = DMUS_E_TYPE_DISABLED;
}
else
{
m_fStateSetBySetParam = TRUE;
m_fActive = FALSE;
hr = S_OK;
}
}
return hr;
}
HRESULT STDMETHODCALLTYPE CTimeSigTrack::AddNotificationType(
/* [in] */ REFGUID rguidNotification)
{
V_INAME(IDirectMusicTrack::AddNotificationType);
V_REFGUID(rguidNotification);
HRESULT hr = S_FALSE;
if( rguidNotification == GUID_NOTIFICATION_MEASUREANDBEAT )
{
m_fNotificationMeasureBeat = TRUE;
hr = S_OK;
}
return hr;
}
HRESULT STDMETHODCALLTYPE CTimeSigTrack::RemoveNotificationType(
/* [in] */ REFGUID rguidNotification)
{
V_INAME(IDirectMusicTrack::RemoveNotificationType);
V_REFGUID(rguidNotification);
HRESULT hr = S_FALSE;
if( rguidNotification == GUID_NOTIFICATION_MEASUREANDBEAT )
{
m_fNotificationMeasureBeat = FALSE;
hr = S_OK;
}
return hr;
}
// send measure and beat notifications
MUSIC_TIME CTimeSigTrack::NotificationMeasureBeat( MUSIC_TIME mtStart, MUSIC_TIME mtEnd,
CTimeSigStateData* pSD, MUSIC_TIME mtOffset )
{
DMUS_NOTIFICATION_PMSG* pEvent = NULL;
MUSIC_TIME mtTime;
DWORD dwMeasure;
BYTE bCurrentBeat;
if( pSD->m_mtTimeSig >= mtEnd )
return mtStart;
if( pSD->m_mtTimeSig > mtStart )
{
mtStart = pSD->m_mtTimeSig;
}
// now actually generate the beat events.
// Generate events that are on beat boundaries, from mtStart to mtEnd
long lQuantize = ( DMUS_PPQ * 4 ) / pSD->m_bBeat;
mtTime = mtStart - pSD->m_mtTimeSig;
if( mtTime ) // 0 stays 0
{
// quantize to next boundary
mtTime = ((( mtTime - 1 ) / lQuantize ) + 1 ) * lQuantize;
}
mtStart += mtTime - ( mtStart - pSD->m_mtTimeSig );
bCurrentBeat = (BYTE)(( ( mtStart - pSD->m_mtTimeSig ) / lQuantize ) % pSD->m_bBeatsPerMeasure);
dwMeasure = mtStart / (pSD->m_bBeatsPerMeasure * lQuantize );
while( mtStart < mtEnd )
{
if( SUCCEEDED( pSD->m_pPerformance->AllocPMsg( sizeof(DMUS_NOTIFICATION_PMSG),
(DMUS_PMSG**)&pEvent )))
{
pEvent->dwType = DMUS_PMSGT_NOTIFICATION;
pEvent->mtTime = mtStart + mtOffset;
pEvent->dwFlags = DMUS_PMSGF_MUSICTIME | DMUS_PMSGF_TOOL_ATTIME;
pEvent->dwPChannel = 0;
pSD->m_pSegState->QueryInterface(IID_IUnknown, (void**)&pEvent->punkUser);
pEvent->dwNotificationOption = DMUS_NOTIFICATION_MEASUREBEAT;
pEvent->dwField1 = bCurrentBeat;
pEvent->dwField2 = dwMeasure;
pEvent->guidNotificationType = GUID_NOTIFICATION_MEASUREANDBEAT;
pEvent->dwGroupID = 0xffffffff;
IDirectMusicGraph* pGraph;
if( SUCCEEDED( pSD->m_pSegState->QueryInterface( IID_IDirectMusicGraph,
(void**)&pGraph )))
{
pGraph->StampPMsg((DMUS_PMSG*) pEvent );
pGraph->Release();
}
if(FAILED(pSD->m_pPerformance->SendPMsg((DMUS_PMSG*) pEvent )))
{
pSD->m_pPerformance->FreePMsg( (DMUS_PMSG*)pEvent );
}
}
bCurrentBeat++;
if( bCurrentBeat >= pSD->m_bBeatsPerMeasure )
{
bCurrentBeat = 0;
dwMeasure += 1;
}
mtStart += lQuantize;
}
return mtEnd;
}
HRESULT STDMETHODCALLTYPE CTimeSigTrack::Clone(
MUSIC_TIME mtStart,
MUSIC_TIME mtEnd,
IDirectMusicTrack** ppTrack)
{
V_INAME(IDirectMusicTrack::Clone);
V_PTRPTR_WRITE(ppTrack);
HRESULT hr = S_OK;
if((mtStart < 0 ) ||(mtStart > mtEnd))
{
Trace(1,"Error: Clone failed on time signature track because of invalid start or end time.\n");
return E_INVALIDARG;
}
EnterCriticalSection(&m_CrSec);
CTimeSigTrack *pDM;
try
{
pDM = new CTimeSigTrack(this, mtStart, mtEnd);
}
catch( ... )
{
pDM = NULL;
}
LeaveCriticalSection(&m_CrSec);
if (pDM == NULL) {
return E_OUTOFMEMORY;
}
hr = pDM->QueryInterface(IID_IDirectMusicTrack, (void**)ppTrack);
pDM->Release();
return hr;
}