其它不解释，贴是代码：
IPFilter.h
[ht ML ]
//&nbs p;
// S am ple DirectShow In-Place Transform Filter t hat accepts data for use in application
//
# include <streams.h>
// This is an example transform filter that is created w IT hin
// the application, and not by CoCreat ei nstance
class CAppTransform : p ub lic CTransformFilter
{
public:
CAppTransform(LPUNKNOWN pUnkOuter, hr ESULT *phr);
HRESULT CheckInputTy PE ( const CMediaType* mtIn);
HRESULT Transform(IMediaSample *pIn, IMediaSample *pOut);
HRESULT CheckTransform(const CMediaType *mtIn,const CMediaType *mtOut);
HRESULT DecideBufferSize(IMemAllocator *pAlloc,
ALLOCATOR_ PR OPERTIES *p Prop erties);
HRESULT GetMediaType(int IPO sition, CMediaType *pMediaType);
private:
HRESULT Copy(IMediaSample *pSource, IMediaSample *pDest) const;
HRESULT Transform(IMediaSample *pSample);
};
// DirectShow graph management sample code:
// This builds a play back graph using RenderFile
// and then inserts a transform filter on the uncom Press ed video.
class CAppGraphBuilder
{
private:
CAppTransform* m_pFilter;
DWORD m_dwObjectTable;
ICaptureGraphBuilder2 *m_pBuild;
IGraphBuilder *m_pGraph;
public:
CAppGraphBuilder();
~CAppGraphBuilder();
void DestroyGraph(void);
HRESULT Build From File(LPCWSTR pszFile);
HRESULT Run(void);
HRESULT MakeChild(HWND hwnd);
HRESULT ResizeVideoWindow(RECT* prc);
private:
void CreateAppFilter(void);
HRESULT Fin DF ilterByInterface(REFIID riid, IBaseFilter** ppFilter);
HRESULT ConnectUpstreamOf(IBaseFilter* pFilter,IBaseFilter*pColor, IBaseFilter* pTransform);
HRESULT NextUpstream(IBaseFilter* pFilter, IBaseFilter** ppNext);
HRESULT CAppGraphBuilder :: AddFilterByCLSID(IGraphBuilder *pGraph,const GUID& clsid,LPCWSTR wszName,IBaseFilter **ppF);
HRESULT InitCaptureGraphBuilder(IGraphBuilder **ppGraph,ICaptureGraphBuilder2 **ppBuild);
HRESULT EnumerateDevices(REFGUID category, IEnum Moniker **ppEnum);
void DisplayDeviceInformation(IEnumMoniker *pEnum, IMoniker** pMoniker);
IPin* GetPin(IBaseFilter* pFilter, PIN_DIRECTION dirRequest);
// Helper methods
IPin* InputPinOf(IBaseFilter* pFilter)
{
return GetPin(pFilter, PINDIR_INPUT);
}
IPin* OutputPinOf(IBaseFilter* pFilter)
{
return GetPin(pFilter, PINDIR_OUTPUT);
}
void AddToObjectTable(void) ;
void RemoveF rom ObjectTable(void);
};
IPFilter.cpp
[html] view pl ai ncopy
//
// Sample DirectShow Transform Filter that accepts data for use in application
//
#include "stdafx.h"
#include "IPFilter.h"
////////////////////////////////////////////////////////////////////////////////
CAppTransform::CAppTransform(LPUNKNOWN pUnkOuter, HRESULT *phr) :
CTransformFilter(NAME("App Transform"), pUnkOuter, GUID_NULL)
{
}
//
// CheckTransform
//
// To be able to transform the formats must be ident ical
//
HRESULT CAppTransform::CheckTransform(const CMediaType *mtIn,const CMediaType *mtOut)
{
CheckPointer(mtIn,E_POINTER);
CheckPointer(mtOut,E_POINTER);
HRESULT hr;
if(FAILED(hr = CheckInputType(mtIn)))
{
return hr;
}
// format must be a VIDEOINFOHEADER
if(*mtOut->FormatType() != FORMAT_VideoInfo)
{
return E_INVALID arg ;
}
// formats must be Big enough
if(mtIn->FormatLength() < sizeof (VIDEOINFOHEADER) ||
mtOut->FormatLength() < sizeof(VIDEOINFOHEADER))
return E_INVALIDARG;
VIDEOINFO *pInput = (VIDEOINFO *) mtIn->Format();
VIDEOINFO *pOutput = (VIDEOINFO *) mtOut->Format();
if(memcmp(&pInput->bmiHeader,&pOutput->bmiHeader,sizeof(BITM API NFOHEADER)) == 0)
{
return NOERROR;
}
return E_INVALIDARG;
} // CheckTransform
//
// DecideBufferSize
//
// Tell the output pin's allocator what size buffers we
// require. Can only do this when the input is connected
//
HRESULT CAppTransform::DecideBufferSize(IMemAllocator *pAlloc,ALLOCATOR_PROPERTIES *pProperties)
{
CheckPointer(pAlloc,E_POINTER);
CheckPointer(pProperties,E_POINTER);
// Is the input pin connected
if(m_pInput->IsConnected() == FALSE)
{
return E_UNE xp ECTED;
}
HRESULT hr = NOERROR;
pProperties->cBuffers = 1;
pProperties->cbBuffer = m_pInput-> current MediaType().GetSampleSize();
ASSERT(pProperties->cbBuffer);
// If we don't have fixed sized samples we must guess some size
if(!m_pInput->CurrentMediaType().bFixedSizeSamples)
{
if(pProperties->cbBuffer < 100000)
{
// nothing more than a guess!!
pProperties->cbBuffer = 100000;
}
}
// Ask the allocator to reserve us some sample memory, NOTE the function
// can succeed (that is return NOERROR) but still not have allocated the
// memory that we requested, so we must check we got whatever we wanted
ALLOCATOR_PROPERTIES Actual;
hr = pAlloc->SetProperties(pProperties,&Actual);
if(FAILED(hr))
{
return hr;
}
ASSERT(Actual.cBuffers == 1);
if(pProperties->cBuffers > Actual.cBuffers ||
pProperties->cbBuffer > Actual.cbBuffer)
{
return E_FAIL;
}
return NOERROR;
} // DecideBufferSize
//
// GetMediaType
//
// I support one type, namely the type of the input pin
// We must be connected to support the single output type
//
HRESULT CAppTransform::GetMediaType(int iPosition, CMediaType *pMediaType)
{
// Is the input pin connected
if(m_pInput->IsConnected() == FALSE)
{
return E_UNEXPECTED;
}
// This should never happen
if(iPosition < 0)
{
return E_INVALIDARG;
}
// Do we have more items to offer
if(iPosition > 0)
{
return VFW_S_NO_MORE_ITEMS;
}
CheckPointer(pMediaType,E_POINTER);
*pMediaType = m_pInput->CurrentMediaType();
return NOERROR;
}
HRESULT CAppTransform::Copy(IMediaSample *pSource, IMediaSample *pDest) const
{
CheckPointer(pSource,E_POINTER);
CheckPointer(pDest,E_POINTER);
// Copy the sample data
BYTE *pSourceBuffer, *pDestBuffer;
long lSourceSize = pSource->GetActualDataLength();
#ifdef DEBUG
long lDestSize = pDest->GetSize();
ASSERT(lDestSize >= lSourceSize);
#endif
pSource->GetPointer(&pSourceBuffer);
pDest->GetPointer(&pDestBuffer);
CopyMemory(( pv OID) pDestBuffer,(PVOID) pSourceBuffer,lSourceSize);
// Copy the sample times
REFERENCE_TIME TimeStart, TimeEnd;
if(NOERROR == pSource->GetTime(&TimeStart, &TimeEnd))
{
pDest->SetTime(&TimeStart, &TimeEnd);
}
LONGLONG MediaStart, MediaEnd;
if(pSource->GetMediaTime(& ;m ediaStart,&MediaEnd) == NOERROR)
{
pDest->SetMediaTime(&MediaStart,&MediaEnd);
}
// Copy the Sync point property
HRESULT hr = pSource->IsSyncPoint();
if(hr == S_OK)
{
pDest->SetSyncPoint(TRUE);
}
else if(hr == S_FALSE)
{
pDest->SetSyncPoint(FALSE);
}
else
{ // an unexpected error has occu red .. .
return E_UNEXPECTED;
}
// Copy the media type
AM_MEDIA_TYPE *pMediaType;
pSource->GetMediaType(&pMediaType);
pDest->SetMediaType(pMediaType);
De let eMediaType(pMediaType);
// Copy the preroll property
hr = pSource->IsPreroll();
if(hr == S_OK)
{
pDest->SetPreroll(TRUE);
}
else if(hr == S_FALSE)
{
pDest->SetPreroll(FALSE);
}
else
{ // an unexpected error has occured...
return E_UNEXPECTED;
}
// Copy the discontinuity property
hr = pSource->IsDiscontinuity();
if(hr == S_OK)
{
pDest->SetDiscontinuity(TRUE);
}
else if(hr == S_FALSE)
{
pDest->SetDiscontinuity(FALSE);
}
else
{ // an unexpected error has occured...
return E_UNEXPECTED;
}
// Copy the actual data length
long lDataLength = pSource->GetActualDataLength();
pDest->SetActualDataLength(lDataLength);
return NOERROR;
} // Copy
//
// Transform
//
// Copy the input sample into the output sample
// Then transform the output sample 'in place'
//
HRESULT CAppTransform::Transform(IMediaSample *pIn, IMediaSample *pOut)
{
HRESULT hr = Copy(pIn, pOut);
if (FAILED(hr)) {
return hr;
}
return Transform(pOut);
} // Transform
HRESULT CAppTransform::Transform(IMediaSample *pSample)
{
// override to do something inside the application
// Such as grabbing a poster frame...
// ...
BYTE *pData; // Pointer to the actual image buffer
long lDataLen; // Holds length of any given sample
int iPixel; // Used to loop through the image pixels
tagRG BT RIPLE *prgb; // Holds a pointer to the current pixel
AM_MEDIA_TYPE* pType = &m_pInput->CurrentMediaType();
VIDEOINFOHEADER *pvi = (VIDEOINFOHEADER *) pType->pbFormat;
ASSERT(pvi);
CheckPointer(pSample,E_POINTER);
pSample->GetPointer(&pData);
lDataLen = pSample->GetSize();
// Get the image properties from the BITMAPINFOHEADER
int cxImage = pvi->bmiHeader.biWidth;
int cyImage = pvi->bmiHeader.biHeight;
int numPixels = cxImage * cyImage;
// int iPixelSize = pvi->bmiHeader.biBitCount / 8;
// int cbImage = cyImage * cxImage * iPixelSize;
prgb = (tagRGBTRIPLE*) pData;
for (iPixel=0; iPixel < numPixels; iPixel++, prgb++) {
prgb->rgbtRed=prgb->rgbtBlue=prgb->rgbtGreen=(prgb->rgbtRed+prgb->rgbtBlue+prgb->rgbtGreen)/3;
}
return S_OK;
}
// Check if we can support this specific proposed type and format
HRESULT CAppTransform::CheckInputType(const CMediaType *pmt)
{
// We accept a series of raw media types
/*if (pmt->majortype == MEDIATYPE_Video &&
(pmt->subtype == MEDIASUBTYPE_RGB32 ||
pmt->subtype == MEDIASUBTYPE_RGB24 ||
pmt->subtype == MEDIASUBTYPE_RGB565 ||
pmt->subtype == MEDIASUBTYPE_RGB555 ||
pmt->subtype == MEDIASUBTYPE_UYVY ||
pmt->subtype == MEDIASUBTYPE_YUY2)||
pmt->subtype==MEDIASUBTYPE_NV12)*/
if (pmt->majortype == MEDIATYPE_Video &&
(pmt->subtype == MEDIASUBTYPE_RGB24))
{
return NOERROR;
}
return E_FAIL;
}
// --- graph building (examples) ---------
CAppGraphBuilder::CAppGraphBuilder() :
m_pBuild(NULL),
m_pGraph(NULL),
m_pFilter(NULL),
m_dwObjectTable(0)
{
CoInitialize(NULL);
}
CAppGraphBuilder::~CAppGraphBuilder()
{
DestroyGraph();
CoUninitialize();
}
void CAppGraphBuilder::DestroyGraph(void)
{
if (m_pGraph)
{
RemoveFromObjectTable();
// ensure graph window is not child of ours
IVideoWindow* pVW = NULL;
HRESULT hr = m_pGraph->QueryInterface(IID_IVideoWindow, (void**)&pVW);
if (SUCCEEDED(hr))
{
pVW->put_Visible(OAFALSE);
pVW->put_Owner(NULL);
pVW->put_MessageDrain(NULL);
pVW->Release();
}
m_pGraph->Release();
m_pGraph = NULL;
m_pBuild->Release();
m_pBuild = NULL;
}
if (m_pFilter)
{
m_pFilter->Release();
m_pFilter = NULL;
}
}
HRESULT CAppGraphBuilder::InitCaptureGraphBuilder(
IGraphBuilder **ppGraph, // Receives the pointer.
ICaptureGraphBuilder2 **ppBuild // Receives the pointer.
)
{
if (!ppGraph || !ppBuild)
{
return E_POINTER;
}
IGraphBuilder *pGraph = NULL;
ICaptureGraphBuilder2 *pBuild = NULL;
// Create the Capture Graph Builder.
HRESULT hr = CoCreateInstance(CLSID_CaptureGraphBuilder2, NULL,
CLSCTX_INPROC_SERVER, IID_ICaptureGraphBuilder2, (void**)&pBuild );
if (SUCCEEDED(hr))
{
// Create the Filter Graph Manager.
hr = CoCreateInstance(CLSID_FilterGraph, 0, CLSCTX_INPROC_SERVER,
IID_IGraphBuilder, (void**)&pGraph);
if (SUCCEEDED(hr))
{
// Initialize the Capture Graph Builder.
pBuild->SetFiltergraph(pGraph);
// Return both interface pointers to the caller.
*ppBuild = pBuild;
*ppGraph = pGraph; // The caller must release both interfaces.
return S_OK;
}
else
{
pBuild->Release();
}
}
return hr; // Failed
}
HRESULT CAppGraphBuilder::EnumerateDevices(REFGUID category, IEnumMoniker **ppEnum)
{
ICreateDevEnum *pDevEnum = NULL;
// Create the Sys tem Device Enumerator.
HRESULT hr = CoCreateInstance(CLSID_ systemd eviceEnum, NULL,
CLSCTX_INPROC_SERVER, IID_ICreateDevEnum,
reinterpret_cast<void**>(&pDevEnum));
if (SUCCEEDED(hr))
{
// Create an enumerator for the video capture category.
hr = pDevEnum->Create Class Enumerator(
CLSID_VideoInputDeviceCategory,
ppEnum, 0);
}
return hr;
}
void CAppGraphBuilder::DisplayDeviceInformation(IEnumMoniker *pEnum, IMoniker** pMoniker)
{
HWND hList; // Handle to the list box.
while (pEnum->Next(1, pMoniker, NULL) == S_OK)
{
IPropertyBag *pPropBag;
HRESULT hr = (*pMoniker)->BindToStorage(0, 0, IID_IPropertyBag,
(void**)(&pPropBag));
if (FAILED(hr))
{
(*pMoniker)->Release();
continue; // Skip this one, maybe the next one will work.
}
// Find the description or friendly name.
VAR IANT varName;
VariantInit(&varName);
hr = pPropBag->Read(L"Description", &varName, 0);
if (FAILED(hr))
{
hr = pPropBag->Read(L"FriendlyName", &varName, 0);
}
if (SUCCEEDED(hr))
{
// Add it to the application's list box.
USES_CONVERSION;
/*(long)SendMessage(hList, LB_ADDSTRING, 0,
(LPARAM)OLE2T(varName.bstrVal));*/
VariantClear(&varName);
}
pPropBag->Release();
(*pMoniker)->Release();
}
}
HRESULT CAppGraphBuilder::AddFilterByCLSID(
IGraphBuilder *pGraph, // Pointer to the Filter Graph Manager.
const GUID& clsid, // CLSID of the filter to create.
LPCWSTR wszName, // A name for the filter.
IBaseFilter **ppF) // Receives a pointer to the filter.
{
if (!pGraph || ! ppF) return E_POINTER;
*ppF = 0;
IBaseFilter *pF = 0;
HRESULT hr = CoCreateInstance(clsid, 0, CLSCTX_INPROC_SERVER,
IID_IBaseFilter, reinterpret_cast<void**>(&pF));
if (SUCCEEDED(hr))
{
hr = pGraph->AddFilter(pF, wszName);
if (SUCCEEDED(hr))
*ppF = pF;
else
pF->Release();
}
return hr;
}
HRESULT CAppGraphBuilder::BuildFromFile(LPCWSTR pszFile)
{
DestroyGraph();
IMoniker* pMoniker;
IMediaEvent *pEvent;
InitCaptureGraphBuilder(&m_pGraph,&m_pBuild);
HRESULT hr = m_pGraph->QueryInterface(IID_IMediaEvent, (void **)&pEvent);
AddToObjectTable();
IBaseFilter *pCap; // Video capture filter.
IEnumMoniker *pEnum;
hr = EnumerateDevices(CLSID_VideoInputDeviceCategory, &pEnum);
DisplayDeviceInformation(pEnum, &pMoniker);
hr = pMoniker->BindToObject(0, 0, IID_IBaseFilter, (void**)&pCap);
if (SUCCEEDED(hr))
{
hr = m_pGraph->AddFilter(pCap, L"Capture Filter");
}
hr = m_pBuild->RenderStream(&PIN_CATEGORY_P rev IEW, &MEDIATYPE_Video, pCap, NULL, NULL);
IBaseFilter *pMux;
hr = m_pBuild->SetOutputFileName(&MEDIASUBTYPE_Avi,L"D://Example.avi",&pMux,NULL);
hr = m_pBuild->RenderStream(&PIN_CATEGORY_CAPTURE,&MEDIATYPE_Video,pCap,NULL,pMux);
// Try to find the video renderer, by looking for IVideoWindow
IBaseFilter* pVR;
hr = FindFilterByInterface(IID_IVideoWindow, &pVR);
if (FAILED(hr))
{
return hr;
}
// Find the media type on the input pin of the Video Renderer
// to check for overlay connection where no actual data is passed
IPin* pPin = InputPinOf(pVR);
AM_MEDIA_TYPE mt;
pPin->ConnectionMediaType(&mt);
pPin->Release();
CMediaType mtIn = mt;
FreeMediaType(mt);
if (mtIn.subtype == MEDIASUBTYPE_Overlay)
{
// This connection may be a overlay mixer
// need to move upstream one place
IBaseFilter* pOvMix = NULL;
hr = NextUpstream(pVR, &pOvMix);
pVR->Release();
if (FAILED(hr))
{
return hr;
}
pVR = pOvMix;
}
// Create the transform and insert in graph
CreateAppFilter();
// Add Color Space Convert
IBaseFilter *pColor;
hr=AddFilterByCLSID(m_pGraph, CLSID_Colour, L"Color Space Converter", &pColor);
// Try to insert our transform filter
hr = ConnectUpstreamOf(pVR, pColor,m_pFilter);
//pVR->Release();
//pColor->Release();
return hr;
}
// Start the graph
HRESULT CAppGraphBuilder::Run(void)
{
IMediaControl* pControl = NULL;
HRESULT hr = m_pGraph->QueryInterface(IID_IMediaControl, (void**)&pControl);
if (SUCCEEDED(hr))
{
hr = pControl->Run();
pControl->Release();
}
return hr;
}
// Make the video window a child of this app
HRESULT CAppGraphBuilder::MakeChild(HWND hwnd)
{
if (!m_pGraph)
{
return E_FAIL;
}
IVideoWindow* pVW = NULL;
HRESULT hr = m_pGraph->QueryInterface(IID_IVideoWindow, (void**)&pVW);
if (SUCCEEDED(hr))
{
HWND hwndOld;
pVW->get_Owner((LONG*)&hwndOld);
if (hwndOld != hwnd)
{
pVW->put_AutoShow(OAFALSE);
pVW->put_Visible(OAFALSE);
long WindowStyle = 0;
// Tweak the video's window style to get rid of the caption and frame:
hr = pVW->get_WindowStyle(&WindowStyle);
if (SUCCEEDED(hr))
{
WindowStyle &= ~WS_OVERLAPPEDWINDOW; // No frame junk
WindowStyle |= WS_CHILD; // Needs to be child
hr = pVW->put_WindowStyle(WindowStyle);
}
pVW->put_Owner((LONG)hwnd);
pVW->put_MessageDrain((LONG)hwnd);
if (hwnd != NULL)
{
RECT rc;
GetClientRect(hwnd, &rc);
pVW->SetWindowPosition(
rc.left,
rc.top,
rc.right - rc.left,
rc.bottom - rc.top);
pVW->put_Visible(OATRUE);
}
}
pVW->Release();
}
return hr;
}
// Resize the video window
HRESULT CAppGraphBuilder::ResizeVideoWindow(RECT* prc)
{
if (!m_pGraph)
{
return E_FAIL;
}
IVideoWindow* pVW = NULL;
HRESULT hr = m_pGraph->QueryInterface(IID_IVideoWindow, (void**)&pVW);
if (SUCCEEDED(hr))
{
hr = pVW->SetWindowPosition(
prc->left,
prc->top,
prc->right - prc->left,
prc->bottom - prc->top);
pVW->Release();
}
return hr;
}
// Create the app-based filter and insert into graph (unconnected)
void CAppGraphBuilder::CreateAppFilter(void)
{
if (m_pFilter)
{
m_pFilter->Release();
m_pFilter = NULL;
}
HRESULT hr = S_OK;
m_pFilter = new CAppTransform(NULL, &hr);
// Make the initial re fc ount 1 to match COM creation!!!
m_pFilter->AddRef();
// Add to graph -- nb need to Query properly for the
// right interface before giving that to the graph object
IBaseFilter* pFilter = NULL;
hr = m_pFilter->QueryInterface(IID_IBaseFilter, (void**)&pFilter);
if (SUCCEEDED(hr))
{
hr = m_pGraph->AddFilter(pFilter, L"App Transform");
pFilter->Release();
}
}
// Locate a filter within the graph by se Arch ing (from renderers upstream)
// looking for a specific interface on the filter
HRESULT CAppGraphBuilder::FindFilterByInterface(REFIID riid, IBaseFilter** ppFilter)
{
*ppFilter = NULL;
IEnum filters * pEnum;
HRESULT hr = m_pGraph->EnumFilters(&pEnum);
if (FAILED(hr))
{
return hr;
}
IBaseFilter* pFilter = NULL;
while (pEnum->Next(1, &pFilter, NULL) == S_OK)
{
// Check for required interface
IUnknown* pUnk;
HRESULT hrQuery = pFilter->QueryInterface(riid, (void**)&pUnk);
if (SUCCEEDED(hrQuery))
{
pUnk->Release();
pEnum->Release();
*ppFilter = pFilter;
return S_OK;
}
pFilter->Release();
}
pEnum->Release();
return E_FAIL;
}
// Connect the filter pTransform upstream of pFilter by reconnecting pins.
// Assumes that pTransform has only one input and one output, and
// that pFilter has only one input.
HRESULT CAppGraphBuilder::ConnectUpstreamOf(IBaseFilter* pFilter, IBaseFilter*pColor,IBaseFilter* pTransform)
{
IPin* pPinIn = InputPinOf(pFilter);
if (!pPinIn)
{
return E_FAIL;
}
// Get the peer output pin
IPin* pPinOut = NULL;
HRESULT hr = pPinIn->ConnectedTo(&pPinOut);
if (FAILED(hr))
{
pPinIn->Release();
return hr;
}
// Disconnect the current connection
hr = m_pGraph->Disconnect(pPinOut);
if (SUCCEEDED(hr))
{
hr = m_pGraph->Disconnect(pPinIn);
}
// Insert pTransform filter by connecting its input pin and output pin
if (SUCCEEDED(hr))
{
IPin* pPinInCor = InputPinOf(pColor);
hr = m_pGraph->Connect(pPinOut, pPinInCor);
pPinInCor->Release();
}
if (SUCCEEDED(hr))
{
IPin* pPinInXfm = InputPinOf(pTransform);
IPin* pPinOutCor = OutputPinOf(pColor);
hr = m_pGraph->Connect(pPinOutCor, pPinInXfm);
pPinInXfm->Release();
pPinOutCor->Release();
}
if (SUCCEEDED(hr))
{
IPin* pPinOutXfm = OutputPinOf(pTransform);
hr = m_pGraph->Connect(pPinOutXfm, pPinIn);
pPinOutXfm->Release();
}
pPinIn->Release();
pPinOut->Release();
return hr;
}
// Find the First pin of a specific direction on a given filter
IPin* CAppGraphBuilder::GetPin(IBaseFilter* pFilter, PIN_DIRECTION dirRequest)
{
IPin * foundPin = NULL;
IEnumPins* pEnum = NULL;
HRESULT hr = pFilter->EnumPins(&pEnum);
if (SUCCEEDED(hr))
{
IPin* pPin = NULL;
while (!foundPin && pEnum->Next(1, &pPin, 0) == S_OK)
{
PIN_DIRECTION dir;
pPin->QueryDirection(&dir);
if (dir == dirRequest)
{
foundPin = pPin;
}
else
{
pPin->Release();
}
}
pEnum->Release();
}
return foundPin;
}
// Follow the pin connections to return the filter that is
// connected to the first input pin of pFilter
HRESULT CAppGraphBuilder::NextUpstream(IBaseFilter* pFilter, IBaseFilter** ppNext)
{
IPin* pPin = InputPinOf(pFilter);
if (!pPin)
{
return E_FAIL;
}
// Get the peer output pin
IPin* pPinOut = NULL;
HRESULT hr = pPin->ConnectedTo(&pPinOut);
pPin->Release();
if (FAILED(hr))
{
return hr;
}
PIN_INFO info;
pPinOut->QueryPinInfo(&info);
pPinOut->Release();
*ppNext = info.pFilter;
return S_OK;
}
//////////////////////// For GraphEdit Dubug purpose /////////////////////////////
void CAppGraphBuilder::AddToObjectTable(void)
{
IMoniker * pMoniker = 0;
IRunningObjectTable * objectTable = 0;
if (SUCCEEDED(GetRunningObjectTable(0, &objectTable)))
{
WCHAR wsz[256];
wsprintfW(wsz, L"FilterGraph %08p pid %08x", (DWORD_PTR)m_pGraph, GetCurrentProcessId());
HRESULT hr = CreateItemMoniker(L"!", wsz, &pMoniker);
if (SUCCEEDED(hr))
{
hr = objectTable->Register(0, m_pGraph, pMoniker, &m_dwObjectTable);
pMoniker->Release();
}
objectTable->Release();
}
}
void CAppGraphBuilder::RemoveFromObjectTable(void)
{
IRunningObjectTable * objectTable = 0;
if (SUCCEEDED(GetRunningObjectTable(0, &objectTable)))
{
objectTable->Revoke(m_dwObjectTable);
objectTable->Release();
m_dwObjectTable = 0;
}
}
调用：
[html]
LPCWSTR wchFile=L"D://example.avi";
m_Graph.BuildFromFile(wchFile);
m_Graph.MakeChild(GetSafeHwnd());
m_Graph.Run();
作者：luckyboy101
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