You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
250 lines
8.5 KiB
250 lines
8.5 KiB
//------------------------------------------------------------------------------
|
|
// File: TransIP.h
|
|
//
|
|
// Desc: DirectShow base classes - defines classes from which simple
|
|
// Transform-In-Place filters may be derived.
|
|
//
|
|
// Copyright (c) 1992-2001 Microsoft Corporation. All rights reserved.
|
|
//------------------------------------------------------------------------------
|
|
|
|
|
|
//
|
|
// The difference between this and Transfrm.h is that Transfrm copies the data.
|
|
//
|
|
// It assumes the filter has one input and one output stream, and has no
|
|
// interest in memory management, interface negotiation or anything else.
|
|
//
|
|
// Derive your class from this, and supply Transform and the media type/format
|
|
// negotiation functions. Implement that class, compile and link and
|
|
// you're done.
|
|
|
|
|
|
#ifndef __TRANSIP__
|
|
#define __TRANSIP__
|
|
|
|
// ======================================================================
|
|
// This is the com object that represents a simple transform filter. It
|
|
// supports IBaseFilter, IMediaFilter and two pins through nested interfaces
|
|
// ======================================================================
|
|
|
|
class CTransInPlaceFilter;
|
|
|
|
// Several of the pin functions call filter functions to do the work,
|
|
// so you can often use the pin classes unaltered, just overriding the
|
|
// functions in CTransInPlaceFilter. If that's not enough and you want
|
|
// to derive your own pin class, override GetPin in the filter to supply
|
|
// your own pin classes to the filter.
|
|
|
|
// ==================================================
|
|
// Implements the input pin
|
|
// ==================================================
|
|
|
|
class CTransInPlaceInputPin : public CTransformInputPin
|
|
{
|
|
|
|
protected:
|
|
CTransInPlaceFilter * const m_pTIPFilter; // our filter
|
|
BOOL m_bReadOnly; // incoming stream is read only
|
|
|
|
public:
|
|
|
|
CTransInPlaceInputPin(
|
|
TCHAR *pObjectName,
|
|
CTransInPlaceFilter *pFilter,
|
|
HRESULT *phr,
|
|
LPCWSTR pName);
|
|
|
|
// --- IMemInputPin -----
|
|
|
|
// Provide an enumerator for media types by getting one from downstream
|
|
STDMETHODIMP EnumMediaTypes( IEnumMediaTypes **ppEnum );
|
|
|
|
// Say whether media type is acceptable.
|
|
HRESULT CheckMediaType(const CMediaType* pmt);
|
|
|
|
// Return our upstream allocator
|
|
STDMETHODIMP GetAllocator(IMemAllocator ** ppAllocator);
|
|
|
|
// get told which allocator the upstream output pin is actually
|
|
// going to use.
|
|
STDMETHODIMP NotifyAllocator(IMemAllocator * pAllocator,
|
|
BOOL bReadOnly);
|
|
|
|
// Allow the filter to see what allocator we have
|
|
// N.B. This does NOT AddRef
|
|
IMemAllocator * PeekAllocator() const
|
|
{ return m_pAllocator; }
|
|
|
|
// Pass this on downstream if it ever gets called.
|
|
STDMETHODIMP GetAllocatorRequirements(ALLOCATOR_PROPERTIES *pProps);
|
|
|
|
HRESULT CompleteConnect(IPin *pReceivePin);
|
|
|
|
inline const BOOL ReadOnly() { return m_bReadOnly ; }
|
|
|
|
}; // CTransInPlaceInputPin
|
|
|
|
// ==================================================
|
|
// Implements the output pin
|
|
// ==================================================
|
|
|
|
class CTransInPlaceOutputPin : public CTransformOutputPin
|
|
{
|
|
|
|
protected:
|
|
// m_pFilter points to our CBaseFilter
|
|
CTransInPlaceFilter * const m_pTIPFilter;
|
|
|
|
public:
|
|
|
|
CTransInPlaceOutputPin(
|
|
TCHAR *pObjectName,
|
|
CTransInPlaceFilter *pFilter,
|
|
HRESULT *phr,
|
|
LPCWSTR pName);
|
|
|
|
|
|
// --- CBaseOutputPin ------------
|
|
|
|
// negotiate the allocator and its buffer size/count
|
|
// Insists on using our own allocator. (Actually the one upstream of us).
|
|
// We don't override this - instead we just agree the default
|
|
// then let the upstream filter decide for itself on reconnect
|
|
// virtual HRESULT DecideAllocator(IMemInputPin * pPin, IMemAllocator ** pAlloc);
|
|
|
|
// Provide a media type enumerator. Get it from upstream.
|
|
STDMETHODIMP EnumMediaTypes( IEnumMediaTypes **ppEnum );
|
|
|
|
// Say whether media type is acceptable.
|
|
HRESULT CheckMediaType(const CMediaType* pmt);
|
|
|
|
// This just saves the allocator being used on the output pin
|
|
// Also called by input pin's GetAllocator()
|
|
void SetAllocator(IMemAllocator * pAllocator);
|
|
|
|
IMemInputPin * ConnectedIMemInputPin()
|
|
{ return m_pInputPin; }
|
|
|
|
// Allow the filter to see what allocator we have
|
|
// N.B. This does NOT AddRef
|
|
IMemAllocator * PeekAllocator() const
|
|
{ return m_pAllocator; }
|
|
|
|
HRESULT CompleteConnect(IPin *pReceivePin);
|
|
|
|
}; // CTransInPlaceOutputPin
|
|
|
|
|
|
class AM_NOVTABLE CTransInPlaceFilter : public CTransformFilter
|
|
{
|
|
|
|
public:
|
|
|
|
// map getpin/getpincount for base enum of pins to owner
|
|
// override this to return more specialised pin objects
|
|
|
|
virtual CBasePin *GetPin(int n);
|
|
|
|
public:
|
|
|
|
// Set bModifiesData == false if your derived filter does
|
|
// not modify the data samples (for instance it's just copying
|
|
// them somewhere else or looking at the timestamps).
|
|
|
|
CTransInPlaceFilter(TCHAR *, LPUNKNOWN, REFCLSID clsid, HRESULT *,
|
|
bool bModifiesData = true);
|
|
#ifdef UNICODE
|
|
CTransInPlaceFilter(CHAR *, LPUNKNOWN, REFCLSID clsid, HRESULT *,
|
|
bool bModifiesData = true);
|
|
#endif
|
|
// The following are defined to avoid undefined pure virtuals.
|
|
// Even if they are never called, they will give linkage warnings/errors
|
|
|
|
// We override EnumMediaTypes to bypass the transform class enumerator
|
|
// which would otherwise call this.
|
|
HRESULT GetMediaType(int iPosition, CMediaType *pMediaType)
|
|
{ DbgBreak("CTransInPlaceFilter::GetMediaType should never be called");
|
|
return E_UNEXPECTED;
|
|
}
|
|
|
|
// This is called when we actually have to provide out own allocator.
|
|
HRESULT DecideBufferSize(IMemAllocator*, ALLOCATOR_PROPERTIES *);
|
|
|
|
// The functions which call this in CTransform are overridden in this
|
|
// class to call CheckInputType with the assumption that the type
|
|
// does not change. In Debug builds some calls will be made and
|
|
// we just ensure that they do not assert.
|
|
HRESULT CheckTransform(const CMediaType *mtIn, const CMediaType *mtOut)
|
|
{
|
|
return S_OK;
|
|
};
|
|
|
|
|
|
// =================================================================
|
|
// ----- You may want to override this -----------------------------
|
|
// =================================================================
|
|
|
|
HRESULT CompleteConnect(PIN_DIRECTION dir,IPin *pReceivePin);
|
|
|
|
// chance to customize the transform process
|
|
virtual HRESULT Receive(IMediaSample *pSample);
|
|
|
|
// =================================================================
|
|
// ----- You MUST override these -----------------------------------
|
|
// =================================================================
|
|
|
|
virtual HRESULT Transform(IMediaSample *pSample) PURE;
|
|
|
|
// this goes in the factory template table to create new instances
|
|
// static CCOMObject * CreateInstance(LPUNKNOWN, HRESULT *);
|
|
|
|
|
|
#ifdef PERF
|
|
// Override to register performance measurement with a less generic string
|
|
// You should do this to avoid confusion with other filters
|
|
virtual void RegisterPerfId()
|
|
{m_idTransInPlace = MSR_REGISTER(TEXT("TransInPlace"));}
|
|
#endif // PERF
|
|
|
|
|
|
// implementation details
|
|
|
|
protected:
|
|
|
|
IMediaSample * CTransInPlaceFilter::Copy(IMediaSample *pSource);
|
|
|
|
#ifdef PERF
|
|
int m_idTransInPlace; // performance measuring id
|
|
#endif // PERF
|
|
bool m_bModifiesData; // Does this filter change the data?
|
|
|
|
// these hold our input and output pins
|
|
|
|
friend class CTransInPlaceInputPin;
|
|
friend class CTransInPlaceOutputPin;
|
|
|
|
CTransInPlaceInputPin *InputPin() const
|
|
{
|
|
return (CTransInPlaceInputPin *)m_pInput;
|
|
};
|
|
CTransInPlaceOutputPin *OutputPin() const
|
|
{
|
|
return (CTransInPlaceOutputPin *)m_pOutput;
|
|
};
|
|
|
|
// Helper to see if the input and output types match
|
|
BOOL TypesMatch()
|
|
{
|
|
return InputPin()->CurrentMediaType() ==
|
|
OutputPin()->CurrentMediaType();
|
|
}
|
|
|
|
// Are the input and output allocators different?
|
|
BOOL UsingDifferentAllocators() const
|
|
{
|
|
return InputPin()->PeekAllocator() != OutputPin()->PeekAllocator();
|
|
}
|
|
}; // CTransInPlaceFilter
|
|
|
|
#endif /* __TRANSIP__ */
|
|
|