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Diffstat (limited to 'thirdparties/win32/include/directshow/amfilter.h')
| -rw-r--r-- | thirdparties/win32/include/directshow/amfilter.h | 1587 |
1 files changed, 1587 insertions, 0 deletions
diff --git a/thirdparties/win32/include/directshow/amfilter.h b/thirdparties/win32/include/directshow/amfilter.h new file mode 100644 index 0000000..8646bc0 --- /dev/null +++ b/thirdparties/win32/include/directshow/amfilter.h @@ -0,0 +1,1587 @@ +//------------------------------------------------------------------------------ +// File: AMFilter.h +// +// Desc: DirectShow base classes - efines class hierarchy for streams +// architecture. +// +// Copyright (c) 1992-2001 Microsoft Corporation. All rights reserved. +//------------------------------------------------------------------------------ + + +#ifndef __FILTER__ +#define __FILTER__ + +/* The following classes are declared in this header: */ + +class CBaseMediaFilter; // IMediaFilter support +class CBaseFilter; // IBaseFilter,IMediaFilter support +class CBasePin; // Abstract base class for IPin interface +class CEnumPins; // Enumerate input and output pins +class CEnumMediaTypes; // Enumerate the pin's preferred formats +class CBaseOutputPin; // Adds data provider member functions +class CBaseInputPin; // Implements IMemInputPin interface +class CMediaSample; // Basic transport unit for IMemInputPin +class CBaseAllocator; // General list guff for most allocators +class CMemAllocator; // Implements memory buffer allocation + + +//===================================================================== +//===================================================================== +// +// QueryFilterInfo and QueryPinInfo AddRef the interface pointers +// they return. You can use the macro below to release the interface. +// +//===================================================================== +//===================================================================== + +#define QueryFilterInfoReleaseGraph(fi) if ((fi).pGraph) (fi).pGraph->Release(); + +#define QueryPinInfoReleaseFilter(pi) if ((pi).pFilter) (pi).pFilter->Release(); + +//===================================================================== +//===================================================================== +// Defines CBaseMediaFilter +// +// Abstract base class implementing IMediaFilter. +// +// Typically you will derive your filter from CBaseFilter rather than +// this, unless you are implementing an object such as a plug-in +// distributor that needs to support IMediaFilter but not IBaseFilter. +// +// Note that IMediaFilter is derived from IPersist to allow query of +// class id. +//===================================================================== +//===================================================================== + +class AM_NOVTABLE CBaseMediaFilter : public CUnknown, + public IMediaFilter +{ + +protected: + + FILTER_STATE m_State; // current state: running, paused + IReferenceClock *m_pClock; // this filter's reference clock + // note: all filters in a filter graph use the same clock + + // offset from stream time to reference time + CRefTime m_tStart; + + CLSID m_clsid; // This filters clsid + // used for serialization + CCritSec *m_pLock; // Object we use for locking + +public: + + CBaseMediaFilter( + __in_opt LPCTSTR pName, + __inout_opt LPUNKNOWN pUnk, + __in CCritSec *pLock, + REFCLSID clsid); + + virtual ~CBaseMediaFilter(); + + DECLARE_IUNKNOWN + + // override this to say what interfaces we support where + STDMETHODIMP NonDelegatingQueryInterface(REFIID riid, __deref_out void ** ppv); + + // + // --- IPersist method --- + // + + STDMETHODIMP GetClassID(__out CLSID *pClsID); + + // --- IMediaFilter methods --- + + STDMETHODIMP GetState(DWORD dwMSecs, __out FILTER_STATE *State); + + STDMETHODIMP SetSyncSource(__inout_opt IReferenceClock *pClock); + + STDMETHODIMP GetSyncSource(__deref_out_opt IReferenceClock **pClock); + + // default implementation of Stop and Pause just record the + // state. Override to activate or de-activate your filter. + // Note that Run when called from Stopped state will call Pause + // to ensure activation, so if you are a source or transform + // you will probably not need to override Run. + STDMETHODIMP Stop(); + STDMETHODIMP Pause(); + + + // the start parameter is the difference to be added to the + // sample's stream time to get the reference time for + // its presentation + STDMETHODIMP Run(REFERENCE_TIME tStart); + + // --- helper methods --- + + // return the current stream time - ie find out what + // stream time should be appearing now + virtual HRESULT StreamTime(CRefTime& rtStream); + + // Is the filter currently active? (running or paused) + BOOL IsActive() { + CAutoLock cObjectLock(m_pLock); + return ((m_State == State_Paused) || (m_State == State_Running)); + }; +}; + +//===================================================================== +//===================================================================== +// Defines CBaseFilter +// +// An abstract class providing basic IBaseFilter support for pin +// enumeration and filter information reading. +// +// We cannot derive from CBaseMediaFilter since methods in IMediaFilter +// are also in IBaseFilter and would be ambiguous. Since much of the code +// assumes that they derive from a class that has m_State and other state +// directly available, we duplicate code from CBaseMediaFilter rather than +// having a member variable. +// +// Derive your filter from this, or from a derived object such as +// CTransformFilter. +//===================================================================== +//===================================================================== + + +class AM_NOVTABLE CBaseFilter : public CUnknown, // Handles an IUnknown + public IBaseFilter, // The Filter Interface + public IAMovieSetup // For un/registration +{ + +friend class CBasePin; + +protected: + FILTER_STATE m_State; // current state: running, paused + IReferenceClock *m_pClock; // this graph's ref clock + CRefTime m_tStart; // offset from stream time to reference time + CLSID m_clsid; // This filters clsid + // used for serialization + CCritSec *m_pLock; // Object we use for locking + + WCHAR *m_pName; // Full filter name + IFilterGraph *m_pGraph; // Graph we belong to + IMediaEventSink *m_pSink; // Called with notify events + LONG m_PinVersion; // Current pin version + +public: + + CBaseFilter( + __in_opt LPCTSTR pName, // Object description + __inout_opt LPUNKNOWN pUnk, // IUnknown of delegating object + __in CCritSec *pLock, // Object who maintains lock + REFCLSID clsid); // The clsid to be used to serialize this filter + + CBaseFilter( + __in_opt LPCTSTR pName, // Object description + __in_opt LPUNKNOWN pUnk, // IUnknown of delegating object + __in CCritSec *pLock, // Object who maintains lock + REFCLSID clsid, // The clsid to be used to serialize this filter + __inout HRESULT *phr); // General OLE return code +#ifdef UNICODE + CBaseFilter( + __in_opt LPCSTR pName, // Object description + __in_opt LPUNKNOWN pUnk, // IUnknown of delegating object + __in CCritSec *pLock, // Object who maintains lock + REFCLSID clsid); // The clsid to be used to serialize this filter + + CBaseFilter( + __in_opt LPCSTR pName, // Object description + __in_opt LPUNKNOWN pUnk, // IUnknown of delegating object + __in CCritSec *pLock, // Object who maintains lock + REFCLSID clsid, // The clsid to be used to serialize this filter + __inout HRESULT *phr); // General OLE return code +#endif + ~CBaseFilter(); + + DECLARE_IUNKNOWN + + // override this to say what interfaces we support where + STDMETHODIMP NonDelegatingQueryInterface(REFIID riid, __deref_out void ** ppv); +#ifdef DEBUG + STDMETHODIMP_(ULONG) NonDelegatingRelease(); +#endif + + // + // --- IPersist method --- + // + + STDMETHODIMP GetClassID(__out CLSID *pClsID); + + // --- IMediaFilter methods --- + + STDMETHODIMP GetState(DWORD dwMSecs, __out FILTER_STATE *State); + + STDMETHODIMP SetSyncSource(__in_opt IReferenceClock *pClock); + + STDMETHODIMP GetSyncSource(__deref_out_opt IReferenceClock **pClock); + + + // override Stop and Pause so we can activate the pins. + // Note that Run will call Pause first if activation needed. + // Override these if you want to activate your filter rather than + // your pins. + STDMETHODIMP Stop(); + STDMETHODIMP Pause(); + + // the start parameter is the difference to be added to the + // sample's stream time to get the reference time for + // its presentation + STDMETHODIMP Run(REFERENCE_TIME tStart); + + // --- helper methods --- + + // return the current stream time - ie find out what + // stream time should be appearing now + virtual HRESULT StreamTime(CRefTime& rtStream); + + // Is the filter currently active? + BOOL IsActive() { + CAutoLock cObjectLock(m_pLock); + return ((m_State == State_Paused) || (m_State == State_Running)); + }; + + // Is this filter stopped (without locking) + BOOL IsStopped() { + return (m_State == State_Stopped); + }; + + // + // --- IBaseFilter methods --- + // + + // pin enumerator + STDMETHODIMP EnumPins( + __deref_out IEnumPins ** ppEnum); + + + // default behaviour of FindPin assumes pin ids are their names + STDMETHODIMP FindPin( + LPCWSTR Id, + __deref_out IPin ** ppPin + ); + + STDMETHODIMP QueryFilterInfo( + __out FILTER_INFO * pInfo); + + STDMETHODIMP JoinFilterGraph( + __inout_opt IFilterGraph * pGraph, + __in_opt LPCWSTR pName); + + // return a Vendor information string. Optional - may return E_NOTIMPL. + // memory returned should be freed using CoTaskMemFree + // default implementation returns E_NOTIMPL + STDMETHODIMP QueryVendorInfo( + __deref_out LPWSTR* pVendorInfo + ); + + // --- helper methods --- + + // send an event notification to the filter graph if we know about it. + // returns S_OK if delivered, S_FALSE if the filter graph does not sink + // events, or an error otherwise. + HRESULT NotifyEvent( + long EventCode, + LONG_PTR EventParam1, + LONG_PTR EventParam2); + + // return the filter graph we belong to + __out_opt IFilterGraph *GetFilterGraph() { + return m_pGraph; + } + + // Request reconnect + // pPin is the pin to reconnect + // pmt is the type to reconnect with - can be NULL + // Calls ReconnectEx on the filter graph + HRESULT ReconnectPin(IPin *pPin, __in_opt AM_MEDIA_TYPE const *pmt); + + // find out the current pin version (used by enumerators) + virtual LONG GetPinVersion(); + void IncrementPinVersion(); + + // you need to supply these to access the pins from the enumerator + // and for default Stop and Pause/Run activation. + virtual int GetPinCount() PURE; + virtual CBasePin *GetPin(int n) PURE; + + // --- IAMovieSetup methods --- + + STDMETHODIMP Register(); // ask filter to register itself + STDMETHODIMP Unregister(); // and unregister itself + + // --- setup helper methods --- + // (override to return filters setup data) + + virtual __out_opt LPAMOVIESETUP_FILTER GetSetupData(){ return NULL; } + +}; + + +//===================================================================== +//===================================================================== +// Defines CBasePin +// +// Abstract class that supports the basics of IPin +//===================================================================== +//===================================================================== + +class AM_NOVTABLE CBasePin : public CUnknown, public IPin, public IQualityControl +{ + +protected: + + WCHAR * m_pName; // This pin's name + IPin *m_Connected; // Pin we have connected to + PIN_DIRECTION m_dir; // Direction of this pin + CCritSec *m_pLock; // Object we use for locking + bool m_bRunTimeError; // Run time error generated + bool m_bCanReconnectWhenActive; // OK to reconnect when active + bool m_bTryMyTypesFirst; // When connecting enumerate + // this pin's types first + CBaseFilter *m_pFilter; // Filter we were created by + IQualityControl *m_pQSink; // Target for Quality messages + LONG m_TypeVersion; // Holds current type version + CMediaType m_mt; // Media type of connection + + CRefTime m_tStart; // time from NewSegment call + CRefTime m_tStop; // time from NewSegment + double m_dRate; // rate from NewSegment + +#ifdef DEBUG + LONG m_cRef; // Ref count tracing +#endif + + // displays pin connection information + +#ifdef DEBUG + void DisplayPinInfo(IPin *pReceivePin); + void DisplayTypeInfo(IPin *pPin, const CMediaType *pmt); +#else + void DisplayPinInfo(IPin *pReceivePin) {}; + void DisplayTypeInfo(IPin *pPin, const CMediaType *pmt) {}; +#endif + + // used to agree a media type for a pin connection + + // given a specific media type, attempt a connection (includes + // checking that the type is acceptable to this pin) + HRESULT + AttemptConnection( + IPin* pReceivePin, // connect to this pin + const CMediaType* pmt // using this type + ); + + // try all the media types in this enumerator - for each that + // we accept, try to connect using ReceiveConnection. + HRESULT TryMediaTypes( + IPin *pReceivePin, // connect to this pin + __in_opt const CMediaType *pmt, // proposed type from Connect + IEnumMediaTypes *pEnum); // try this enumerator + + // establish a connection with a suitable mediatype. Needs to + // propose a media type if the pmt pointer is null or partially + // specified - use TryMediaTypes on both our and then the other pin's + // enumerator until we find one that works. + HRESULT AgreeMediaType( + IPin *pReceivePin, // connect to this pin + const CMediaType *pmt); // proposed type from Connect + +public: + + CBasePin( + __in_opt LPCTSTR pObjectName, // Object description + __in CBaseFilter *pFilter, // Owning filter who knows about pins + __in CCritSec *pLock, // Object who implements the lock + __inout HRESULT *phr, // General OLE return code + __in_opt LPCWSTR pName, // Pin name for us + PIN_DIRECTION dir); // Either PINDIR_INPUT or PINDIR_OUTPUT +#ifdef UNICODE + CBasePin( + __in_opt LPCSTR pObjectName, // Object description + __in CBaseFilter *pFilter, // Owning filter who knows about pins + __in CCritSec *pLock, // Object who implements the lock + __inout HRESULT *phr, // General OLE return code + __in_opt LPCWSTR pName, // Pin name for us + PIN_DIRECTION dir); // Either PINDIR_INPUT or PINDIR_OUTPUT +#endif + virtual ~CBasePin(); + + DECLARE_IUNKNOWN + + STDMETHODIMP NonDelegatingQueryInterface(REFIID riid, __deref_out void ** ppv); + STDMETHODIMP_(ULONG) NonDelegatingRelease(); + STDMETHODIMP_(ULONG) NonDelegatingAddRef(); + + // --- IPin methods --- + + // take lead role in establishing a connection. Media type pointer + // may be null, or may point to partially-specified mediatype + // (subtype or format type may be GUID_NULL). + STDMETHODIMP Connect( + IPin * pReceivePin, + __in_opt const AM_MEDIA_TYPE *pmt // optional media type + ); + + // (passive) accept a connection from another pin + STDMETHODIMP ReceiveConnection( + IPin * pConnector, // this is the initiating connecting pin + const AM_MEDIA_TYPE *pmt // this is the media type we will exchange + ); + + STDMETHODIMP Disconnect(); + + STDMETHODIMP ConnectedTo(__deref_out IPin **pPin); + + STDMETHODIMP ConnectionMediaType(__out AM_MEDIA_TYPE *pmt); + + STDMETHODIMP QueryPinInfo( + __out PIN_INFO * pInfo + ); + + STDMETHODIMP QueryDirection( + __out PIN_DIRECTION * pPinDir + ); + + STDMETHODIMP QueryId( + __deref_out LPWSTR * Id + ); + + // does the pin support this media type + STDMETHODIMP QueryAccept( + const AM_MEDIA_TYPE *pmt + ); + + // return an enumerator for this pins preferred media types + STDMETHODIMP EnumMediaTypes( + __deref_out IEnumMediaTypes **ppEnum + ); + + // return an array of IPin* - the pins that this pin internally connects to + // All pins put in the array must be AddReffed (but no others) + // Errors: "Can't say" - FAIL, not enough slots - return S_FALSE + // Default: return E_NOTIMPL + // The filter graph will interpret NOT_IMPL as any input pin connects to + // all visible output pins and vice versa. + // apPin can be NULL if nPin==0 (not otherwise). + STDMETHODIMP QueryInternalConnections( + __out_ecount_part(*nPin,*nPin) IPin* *apPin, // array of IPin* + __inout ULONG *nPin // on input, the number of slots + // on output the number of pins + ) { return E_NOTIMPL; } + + // Called when no more data will be sent + STDMETHODIMP EndOfStream(void); + + // Begin/EndFlush still PURE + + // NewSegment notifies of the start/stop/rate applying to the data + // about to be received. Default implementation records data and + // returns S_OK. + // Override this to pass downstream. + STDMETHODIMP NewSegment( + REFERENCE_TIME tStart, + REFERENCE_TIME tStop, + double dRate); + + //================================================================================ + // IQualityControl methods + //================================================================================ + + STDMETHODIMP Notify(IBaseFilter * pSender, Quality q); + + STDMETHODIMP SetSink(IQualityControl * piqc); + + // --- helper methods --- + + // Returns true if the pin is connected. false otherwise. + BOOL IsConnected(void) {return (m_Connected != NULL); }; + // Return the pin this is connected to (if any) + IPin * GetConnected() { return m_Connected; }; + + // Check if our filter is currently stopped + BOOL IsStopped() { + return (m_pFilter->m_State == State_Stopped); + }; + + // find out the current type version (used by enumerators) + virtual LONG GetMediaTypeVersion(); + void IncrementTypeVersion(); + + // switch the pin to active (paused or running) mode + // not an error to call this if already active + virtual HRESULT Active(void); + + // switch the pin to inactive state - may already be inactive + virtual HRESULT Inactive(void); + + // Notify of Run() from filter + virtual HRESULT Run(REFERENCE_TIME tStart); + + // check if the pin can support this specific proposed type and format + virtual HRESULT CheckMediaType(const CMediaType *) PURE; + + // set the connection to use this format (previously agreed) + virtual HRESULT SetMediaType(const CMediaType *); + + // check that the connection is ok before verifying it + // can be overridden eg to check what interfaces will be supported. + virtual HRESULT CheckConnect(IPin *); + + // Set and release resources required for a connection + virtual HRESULT BreakConnect(); + virtual HRESULT CompleteConnect(IPin *pReceivePin); + + // returns the preferred formats for a pin + virtual HRESULT GetMediaType(int iPosition, __inout CMediaType *pMediaType); + + // access to NewSegment values + REFERENCE_TIME CurrentStopTime() { + return m_tStop; + } + REFERENCE_TIME CurrentStartTime() { + return m_tStart; + } + double CurrentRate() { + return m_dRate; + } + + // Access name + LPWSTR Name() { return m_pName; }; + + // Can reconnectwhen active? + void SetReconnectWhenActive(bool bCanReconnect) + { + m_bCanReconnectWhenActive = bCanReconnect; + } + + bool CanReconnectWhenActive() + { + return m_bCanReconnectWhenActive; + } + +protected: + STDMETHODIMP DisconnectInternal(); +}; + + +//===================================================================== +//===================================================================== +// Defines CEnumPins +// +// Pin enumerator class that works by calling CBaseFilter. This interface +// is provided by CBaseFilter::EnumPins and calls GetPinCount() and +// GetPin() to enumerate existing pins. Needs to be a separate object so +// that it can be cloned (creating an existing object at the same +// position in the enumeration) +// +//===================================================================== +//===================================================================== + +class CEnumPins : public IEnumPins // The interface we support +{ + int m_Position; // Current ordinal position + int m_PinCount; // Number of pins available + CBaseFilter *m_pFilter; // The filter who owns us + LONG m_Version; // Pin version information + LONG m_cRef; + + typedef CGenericList<CBasePin> CPinList; + + CPinList m_PinCache; // These pointers have not been AddRef'ed and + // so they should not be dereferenced. They are + // merely kept to ID which pins have been enumerated. + +#ifdef DEBUG + DWORD m_dwCookie; +#endif + + /* If while we are retrieving a pin for example from the filter an error + occurs we assume that our internal state is stale with respect to the + filter (someone may have deleted all the pins). We can check before + starting whether or not the operation is likely to fail by asking the + filter what it's current version number is. If the filter has not + overriden the GetPinVersion method then this will always match */ + + BOOL AreWeOutOfSync() { + return (m_pFilter->GetPinVersion() == m_Version ? FALSE : TRUE); + }; + + /* This method performs the same operations as Reset, except is does not clear + the cache of pins already enumerated. */ + + STDMETHODIMP Refresh(); + +public: + + CEnumPins( + __in CBaseFilter *pFilter, + __in_opt CEnumPins *pEnumPins); + + virtual ~CEnumPins(); + + // IUnknown + STDMETHODIMP QueryInterface(REFIID riid, __deref_out void **ppv); + STDMETHODIMP_(ULONG) AddRef(); + STDMETHODIMP_(ULONG) Release(); + + // IEnumPins + STDMETHODIMP Next( + ULONG cPins, // place this many pins... + __out_ecount(cPins) IPin ** ppPins, // ...in this array of IPin* + __out_opt ULONG * pcFetched // actual count passed returned here + ); + + STDMETHODIMP Skip(ULONG cPins); + STDMETHODIMP Reset(); + STDMETHODIMP Clone(__deref_out IEnumPins **ppEnum); + + +}; + + +//===================================================================== +//===================================================================== +// Defines CEnumMediaTypes +// +// Enumerates the preferred formats for input and output pins +//===================================================================== +//===================================================================== + +class CEnumMediaTypes : public IEnumMediaTypes // The interface we support +{ + int m_Position; // Current ordinal position + CBasePin *m_pPin; // The pin who owns us + LONG m_Version; // Media type version value + LONG m_cRef; +#ifdef DEBUG + DWORD m_dwCookie; +#endif + + /* The media types a filter supports can be quite dynamic so we add to + the general IEnumXXXX interface the ability to be signaled when they + change via an event handle the connected filter supplies. Until the + Reset method is called after the state changes all further calls to + the enumerator (except Reset) will return E_UNEXPECTED error code */ + + BOOL AreWeOutOfSync() { + return (m_pPin->GetMediaTypeVersion() == m_Version ? FALSE : TRUE); + }; + +public: + + CEnumMediaTypes( + __in CBasePin *pPin, + __in_opt CEnumMediaTypes *pEnumMediaTypes); + + virtual ~CEnumMediaTypes(); + + // IUnknown + STDMETHODIMP QueryInterface(REFIID riid, __deref_out void **ppv); + STDMETHODIMP_(ULONG) AddRef(); + STDMETHODIMP_(ULONG) Release(); + + // IEnumMediaTypes + STDMETHODIMP Next( + ULONG cMediaTypes, // place this many pins... + __out_ecount(cMediaTypes) AM_MEDIA_TYPE ** ppMediaTypes, // ...in this array + __out_opt ULONG * pcFetched // actual count passed + ); + + STDMETHODIMP Skip(ULONG cMediaTypes); + STDMETHODIMP Reset(); + STDMETHODIMP Clone(__deref_out IEnumMediaTypes **ppEnum); +}; + + + + +//===================================================================== +//===================================================================== +// Defines CBaseOutputPin +// +// class derived from CBasePin that can pass buffers to a connected pin +// that supports IMemInputPin. Supports IPin. +// +// Derive your output pin from this. +// +//===================================================================== +//===================================================================== + +class AM_NOVTABLE CBaseOutputPin : public CBasePin +{ + +protected: + + IMemAllocator *m_pAllocator; + IMemInputPin *m_pInputPin; // interface on the downstreaminput pin + // set up in CheckConnect when we connect. + +public: + + CBaseOutputPin( + __in_opt LPCTSTR pObjectName, + __in CBaseFilter *pFilter, + __in CCritSec *pLock, + __inout HRESULT *phr, + __in_opt LPCWSTR pName); +#ifdef UNICODE + CBaseOutputPin( + __in_opt LPCSTR pObjectName, + __in CBaseFilter *pFilter, + __in CCritSec *pLock, + __inout HRESULT *phr, + __in_opt LPCWSTR pName); +#endif + // override CompleteConnect() so we can negotiate an allocator + virtual HRESULT CompleteConnect(IPin *pReceivePin); + + // negotiate the allocator and its buffer size/count and other properties + // Calls DecideBufferSize to set properties + virtual HRESULT DecideAllocator(IMemInputPin * pPin, __deref_out IMemAllocator ** pAlloc); + + // override this to set the buffer size and count. Return an error + // if the size/count is not to your liking. + // The allocator properties passed in are those requested by the + // input pin - use eg the alignment and prefix members if you have + // no preference on these. + virtual HRESULT DecideBufferSize( + IMemAllocator * pAlloc, + __inout ALLOCATOR_PROPERTIES * ppropInputRequest + ) PURE; + + // returns an empty sample buffer from the allocator + virtual HRESULT GetDeliveryBuffer(__deref_out IMediaSample ** ppSample, + __in_opt REFERENCE_TIME * pStartTime, + __in_opt REFERENCE_TIME * pEndTime, + DWORD dwFlags); + + // deliver a filled-in sample to the connected input pin + // note - you need to release it after calling this. The receiving + // pin will addref the sample if it needs to hold it beyond the + // call. + virtual HRESULT Deliver(IMediaSample *); + + // override this to control the connection + virtual HRESULT InitAllocator(__deref_out IMemAllocator **ppAlloc); + HRESULT CheckConnect(IPin *pPin); + HRESULT BreakConnect(); + + // override to call Commit and Decommit + HRESULT Active(void); + HRESULT Inactive(void); + + // we have a default handling of EndOfStream which is to return + // an error, since this should be called on input pins only + STDMETHODIMP EndOfStream(void); + + // called from elsewhere in our filter to pass EOS downstream to + // our connected input pin + virtual HRESULT DeliverEndOfStream(void); + + // same for Begin/EndFlush - we handle Begin/EndFlush since it + // is an error on an output pin, and we have Deliver methods to + // call the methods on the connected pin + STDMETHODIMP BeginFlush(void); + STDMETHODIMP EndFlush(void); + virtual HRESULT DeliverBeginFlush(void); + virtual HRESULT DeliverEndFlush(void); + + // deliver NewSegment to connected pin - you will need to + // override this if you queue any data in your output pin. + virtual HRESULT DeliverNewSegment( + REFERENCE_TIME tStart, + REFERENCE_TIME tStop, + double dRate); + + //================================================================================ + // IQualityControl methods + //================================================================================ + + // All inherited from CBasePin and not overridden here. + // STDMETHODIMP Notify(IBaseFilter * pSender, Quality q); + // STDMETHODIMP SetSink(IQualityControl * piqc); +}; + + +//===================================================================== +//===================================================================== +// Defines CBaseInputPin +// +// derive your standard input pin from this. +// you need to supply GetMediaType and CheckConnect etc (see CBasePin), +// and you need to supply Receive to do something more useful. +// +//===================================================================== +//===================================================================== + +class AM_NOVTABLE CBaseInputPin : public CBasePin, + public IMemInputPin +{ + +protected: + + IMemAllocator *m_pAllocator; // Default memory allocator + + // allocator is read-only, so received samples + // cannot be modified (probably only relevant to in-place + // transforms + BYTE m_bReadOnly; + + // in flushing state (between BeginFlush and EndFlush) + // if TRUE, all Receives are returned with S_FALSE + BYTE m_bFlushing; + + // Sample properties - initalized in Receive + AM_SAMPLE2_PROPERTIES m_SampleProps; + +public: + + CBaseInputPin( + __in_opt LPCTSTR pObjectName, + __in CBaseFilter *pFilter, + __in CCritSec *pLock, + __inout HRESULT *phr, + __in_opt LPCWSTR pName); +#ifdef UNICODE + CBaseInputPin( + __in_opt LPCSTR pObjectName, + __in CBaseFilter *pFilter, + __in CCritSec *pLock, + __inout HRESULT *phr, + __in_opt LPCWSTR pName); +#endif + virtual ~CBaseInputPin(); + + DECLARE_IUNKNOWN + + // override this to publicise our interfaces + STDMETHODIMP NonDelegatingQueryInterface(REFIID riid, __deref_out void **ppv); + + // return the allocator interface that this input pin + // would like the output pin to use + STDMETHODIMP GetAllocator(__deref_out IMemAllocator ** ppAllocator); + + // tell the input pin which allocator the output pin is actually + // going to use. + STDMETHODIMP NotifyAllocator( + IMemAllocator * pAllocator, + BOOL bReadOnly); + + // do something with this media sample + STDMETHODIMP Receive(IMediaSample *pSample); + + // do something with these media samples + STDMETHODIMP ReceiveMultiple ( + __in_ecount(nSamples) IMediaSample **pSamples, + long nSamples, + __out long *nSamplesProcessed); + + // See if Receive() blocks + STDMETHODIMP ReceiveCanBlock(); + + // Default handling for BeginFlush - call at the beginning + // of your implementation (makes sure that all Receive calls + // fail). After calling this, you need to free any queued data + // and then call downstream. + STDMETHODIMP BeginFlush(void); + + // default handling for EndFlush - call at end of your implementation + // - before calling this, ensure that there is no queued data and no thread + // pushing any more without a further receive, then call downstream, + // then call this method to clear the m_bFlushing flag and re-enable + // receives + STDMETHODIMP EndFlush(void); + + // this method is optional (can return E_NOTIMPL). + // default implementation returns E_NOTIMPL. Override if you have + // specific alignment or prefix needs, but could use an upstream + // allocator + STDMETHODIMP GetAllocatorRequirements(__out ALLOCATOR_PROPERTIES*pProps); + + // Release the pin's allocator. + HRESULT BreakConnect(); + + // helper method to check the read-only flag + BOOL IsReadOnly() { + return m_bReadOnly; + }; + + // helper method to see if we are flushing + BOOL IsFlushing() { + return m_bFlushing; + }; + + // Override this for checking whether it's OK to process samples + // Also call this from EndOfStream. + virtual HRESULT CheckStreaming(); + + // Pass a Quality notification on to the appropriate sink + HRESULT PassNotify(Quality& q); + + + //================================================================================ + // IQualityControl methods (from CBasePin) + //================================================================================ + + STDMETHODIMP Notify(IBaseFilter * pSender, Quality q); + + // no need to override: + // STDMETHODIMP SetSink(IQualityControl * piqc); + + + // switch the pin to inactive state - may already be inactive + virtual HRESULT Inactive(void); + + // Return sample properties pointer + AM_SAMPLE2_PROPERTIES * SampleProps() { + ASSERT(m_SampleProps.cbData != 0); + return &m_SampleProps; + } + +}; + +/////////////////////////////////////////////////////////////////////////// +// CDynamicOutputPin +// + +class CDynamicOutputPin : public CBaseOutputPin, + public IPinFlowControl +{ +public: +#ifdef UNICODE + CDynamicOutputPin( + __in_opt LPCSTR pObjectName, + __in CBaseFilter *pFilter, + __in CCritSec *pLock, + __inout HRESULT *phr, + __in_opt LPCWSTR pName); +#endif + + CDynamicOutputPin( + __in_opt LPCTSTR pObjectName, + __in CBaseFilter *pFilter, + __in CCritSec *pLock, + __inout HRESULT *phr, + __in_opt LPCWSTR pName); + + ~CDynamicOutputPin(); + + // IUnknown Methods + DECLARE_IUNKNOWN + STDMETHODIMP NonDelegatingQueryInterface(REFIID riid, __deref_out void **ppv); + + // IPin Methods + STDMETHODIMP Disconnect(void); + + // IPinFlowControl Methods + STDMETHODIMP Block(DWORD dwBlockFlags, HANDLE hEvent); + + // Set graph config info + void SetConfigInfo(IGraphConfig *pGraphConfig, HANDLE hStopEvent); + + #ifdef DEBUG + virtual HRESULT Deliver(IMediaSample *pSample); + virtual HRESULT DeliverEndOfStream(void); + virtual HRESULT DeliverNewSegment(REFERENCE_TIME tStart, REFERENCE_TIME tStop, double dRate); + #endif // DEBUG + + HRESULT DeliverBeginFlush(void); + HRESULT DeliverEndFlush(void); + + HRESULT Inactive(void); + HRESULT Active(void); + virtual HRESULT CompleteConnect(IPin *pReceivePin); + + virtual HRESULT StartUsingOutputPin(void); + virtual void StopUsingOutputPin(void); + virtual bool StreamingThreadUsingOutputPin(void); + + HRESULT ChangeOutputFormat + ( + const AM_MEDIA_TYPE *pmt, + REFERENCE_TIME tSegmentStart, + REFERENCE_TIME tSegmentStop, + double dSegmentRate + ); + HRESULT ChangeMediaType(const CMediaType *pmt); + HRESULT DynamicReconnect(const CMediaType *pmt); + +protected: + HRESULT SynchronousBlockOutputPin(void); + HRESULT AsynchronousBlockOutputPin(HANDLE hNotifyCallerPinBlockedEvent); + HRESULT UnblockOutputPin(void); + + void BlockOutputPin(void); + void ResetBlockState(void); + + static HRESULT WaitEvent(HANDLE hEvent); + + enum BLOCK_STATE + { + NOT_BLOCKED, + PENDING, + BLOCKED + }; + + // This lock should be held when the following class members are + // being used: m_hNotifyCallerPinBlockedEvent, m_BlockState, + // m_dwBlockCallerThreadID and m_dwNumOutstandingOutputPinUsers. + CCritSec m_BlockStateLock; + + // This event should be signaled when the output pin is + // not blocked. This is a manual reset event. For more + // information on events, see the documentation for + // CreateEvent() in the Windows SDK. + HANDLE m_hUnblockOutputPinEvent; + + // This event will be signaled when block operation succeedes or + // when the user cancels the block operation. The block operation + // can be canceled by calling IPinFlowControl2::Block( 0, NULL ) + // while the block operation is pending. + HANDLE m_hNotifyCallerPinBlockedEvent; + + // The state of the current block operation. + BLOCK_STATE m_BlockState; + + // The ID of the thread which last called IPinFlowControl::Block(). + // For more information on thread IDs, see the documentation for + // GetCurrentThreadID() in the Windows SDK. + DWORD m_dwBlockCallerThreadID; + + // The number of times StartUsingOutputPin() has been sucessfully + // called and a corresponding call to StopUsingOutputPin() has not + // been made. When this variable is greater than 0, the streaming + // thread is calling IPin::NewSegment(), IPin::EndOfStream(), + // IMemInputPin::Receive() or IMemInputPin::ReceiveMultiple(). The + // streaming thread could also be calling: DynamicReconnect(), + // ChangeMediaType() or ChangeOutputFormat(). The output pin cannot + // be blocked while the output pin is being used. + DWORD m_dwNumOutstandingOutputPinUsers; + + // This event should be set when the IMediaFilter::Stop() is called. + // This is a manual reset event. It is also set when the output pin + // delivers a flush to the connected input pin. + HANDLE m_hStopEvent; + IGraphConfig* m_pGraphConfig; + + // TRUE if the output pin's allocator's samples are read only. + // Otherwise FALSE. For more information, see the documentation + // for IMemInputPin::NotifyAllocator(). + BOOL m_bPinUsesReadOnlyAllocator; + +private: + HRESULT Initialize(void); + HRESULT ChangeMediaTypeHelper(const CMediaType *pmt); + + #ifdef DEBUG + void AssertValid(void); + #endif // DEBUG +}; + +class CAutoUsingOutputPin +{ +public: + CAutoUsingOutputPin( __in CDynamicOutputPin* pOutputPin, __inout HRESULT* phr ); + ~CAutoUsingOutputPin(); + +private: + CDynamicOutputPin* m_pOutputPin; +}; + +inline CAutoUsingOutputPin::CAutoUsingOutputPin( __in CDynamicOutputPin* pOutputPin, __inout HRESULT* phr ) : + m_pOutputPin(NULL) +{ + // The caller should always pass in valid pointers. + ASSERT( NULL != pOutputPin ); + ASSERT( NULL != phr ); + + // Make sure the user initialized phr. + ASSERT( S_OK == *phr ); + + HRESULT hr = pOutputPin->StartUsingOutputPin(); + if( FAILED( hr ) ) + { + *phr = hr; + return; + } + + m_pOutputPin = pOutputPin; +} + +inline CAutoUsingOutputPin::~CAutoUsingOutputPin() +{ + if( NULL != m_pOutputPin ) + { + m_pOutputPin->StopUsingOutputPin(); + } +} + +#ifdef DEBUG + +inline HRESULT CDynamicOutputPin::Deliver(IMediaSample *pSample) +{ + // The caller should call StartUsingOutputPin() before calling this + // method. + ASSERT(StreamingThreadUsingOutputPin()); + + return CBaseOutputPin::Deliver(pSample); +} + +inline HRESULT CDynamicOutputPin::DeliverEndOfStream(void) +{ + // The caller should call StartUsingOutputPin() before calling this + // method. + ASSERT( StreamingThreadUsingOutputPin() ); + + return CBaseOutputPin::DeliverEndOfStream(); +} + +inline HRESULT CDynamicOutputPin::DeliverNewSegment(REFERENCE_TIME tStart, REFERENCE_TIME tStop, double dRate) +{ + // The caller should call StartUsingOutputPin() before calling this + // method. + ASSERT(StreamingThreadUsingOutputPin()); + + return CBaseOutputPin::DeliverNewSegment(tStart, tStop, dRate); +} + +#endif // DEBUG + +//===================================================================== +//===================================================================== +// Memory allocators +// +// the shared memory transport between pins requires the input pin +// to provide a memory allocator that can provide sample objects. A +// sample object supports the IMediaSample interface. +// +// CBaseAllocator handles the management of free and busy samples. It +// allocates CMediaSample objects. CBaseAllocator is an abstract class: +// in particular it has no method of initializing the list of free +// samples. CMemAllocator is derived from CBaseAllocator and initializes +// the list of samples using memory from the standard IMalloc interface. +// +// If you want your buffers to live in some special area of memory, +// derive your allocator object from CBaseAllocator. If you derive your +// IMemInputPin interface object from CBaseMemInputPin, you will get +// CMemAllocator-based allocation etc for free and will just need to +// supply the Receive handling, and media type / format negotiation. +//===================================================================== +//===================================================================== + + +//===================================================================== +//===================================================================== +// Defines CMediaSample +// +// an object of this class supports IMediaSample and represents a buffer +// for media data with some associated properties. Releasing it returns +// it to a freelist managed by a CBaseAllocator derived object. +//===================================================================== +//===================================================================== + +class CMediaSample : public IMediaSample2 // The interface we support +{ + +protected: + + friend class CBaseAllocator; + + /* Values for dwFlags - these are used for backward compatiblity + only now - use AM_SAMPLE_xxx + */ + enum { Sample_SyncPoint = 0x01, /* Is this a sync point */ + Sample_Preroll = 0x02, /* Is this a preroll sample */ + Sample_Discontinuity = 0x04, /* Set if start of new segment */ + Sample_TypeChanged = 0x08, /* Has the type changed */ + Sample_TimeValid = 0x10, /* Set if time is valid */ + Sample_MediaTimeValid = 0x20, /* Is the media time valid */ + Sample_TimeDiscontinuity = 0x40, /* Time discontinuity */ + Sample_StopValid = 0x100, /* Stop time valid */ + Sample_ValidFlags = 0x1FF + }; + + /* Properties, the media sample class can be a container for a format + change in which case we take a copy of a type through the SetMediaType + interface function and then return it when GetMediaType is called. As + we do no internal processing on it we leave it as a pointer */ + + DWORD m_dwFlags; /* Flags for this sample */ + /* Type specific flags are packed + into the top word + */ + DWORD m_dwTypeSpecificFlags; /* Media type specific flags */ + __field_ecount_opt(m_cbBuffer) LPBYTE m_pBuffer; /* Pointer to the complete buffer */ + LONG m_lActual; /* Length of data in this sample */ + LONG m_cbBuffer; /* Size of the buffer */ + CBaseAllocator *m_pAllocator; /* The allocator who owns us */ + CMediaSample *m_pNext; /* Chaining in free list */ + REFERENCE_TIME m_Start; /* Start sample time */ + REFERENCE_TIME m_End; /* End sample time */ + LONGLONG m_MediaStart; /* Real media start position */ + LONG m_MediaEnd; /* A difference to get the end */ + AM_MEDIA_TYPE *m_pMediaType; /* Media type change data */ + DWORD m_dwStreamId; /* Stream id */ +public: + LONG m_cRef; /* Reference count */ + + +public: + + CMediaSample( + __in_opt LPCTSTR pName, + __in_opt CBaseAllocator *pAllocator, + __inout_opt HRESULT *phr, + __in_bcount_opt(length) LPBYTE pBuffer = NULL, + LONG length = 0); +#ifdef UNICODE + CMediaSample( + __in_opt LPCSTR pName, + __in_opt CBaseAllocator *pAllocator, + __inout_opt HRESULT *phr, + __in_bcount_opt(length) LPBYTE pBuffer = NULL, + LONG length = 0); +#endif + + virtual ~CMediaSample(); + + /* Note the media sample does not delegate to its owner */ + + STDMETHODIMP QueryInterface(REFIID riid, __deref_out void **ppv); + STDMETHODIMP_(ULONG) AddRef(); + STDMETHODIMP_(ULONG) Release(); + + // set the buffer pointer and length. Used by allocators that + // want variable sized pointers or pointers into already-read data. + // This is only available through a CMediaSample* not an IMediaSample* + // and so cannot be changed by clients. + HRESULT SetPointer(__in_bcount(cBytes) BYTE * ptr, LONG cBytes); + + // Get me a read/write pointer to this buffer's memory. + STDMETHODIMP GetPointer(__deref_out BYTE ** ppBuffer); + + STDMETHODIMP_(LONG) GetSize(void); + + // get the stream time at which this sample should start and finish. + STDMETHODIMP GetTime( + __out REFERENCE_TIME * pTimeStart, // put time here + __out REFERENCE_TIME * pTimeEnd + ); + + // Set the stream time at which this sample should start and finish. + STDMETHODIMP SetTime( + __in_opt REFERENCE_TIME * pTimeStart, // put time here + __in_opt REFERENCE_TIME * pTimeEnd + ); + STDMETHODIMP IsSyncPoint(void); + STDMETHODIMP SetSyncPoint(BOOL bIsSyncPoint); + STDMETHODIMP IsPreroll(void); + STDMETHODIMP SetPreroll(BOOL bIsPreroll); + + STDMETHODIMP_(LONG) GetActualDataLength(void); + STDMETHODIMP SetActualDataLength(LONG lActual); + + // these allow for limited format changes in band + + STDMETHODIMP GetMediaType(__deref_out AM_MEDIA_TYPE **ppMediaType); + STDMETHODIMP SetMediaType(__in_opt AM_MEDIA_TYPE *pMediaType); + + // returns S_OK if there is a discontinuity in the data (this same is + // not a continuation of the previous stream of data + // - there has been a seek). + STDMETHODIMP IsDiscontinuity(void); + // set the discontinuity property - TRUE if this sample is not a + // continuation, but a new sample after a seek. + STDMETHODIMP SetDiscontinuity(BOOL bDiscontinuity); + + // get the media times for this sample + STDMETHODIMP GetMediaTime( + __out LONGLONG * pTimeStart, + __out LONGLONG * pTimeEnd + ); + + // Set the media times for this sample + STDMETHODIMP SetMediaTime( + __in_opt LONGLONG * pTimeStart, + __in_opt LONGLONG * pTimeEnd + ); + + // Set and get properties (IMediaSample2) + STDMETHODIMP GetProperties( + DWORD cbProperties, + __out_bcount(cbProperties) BYTE * pbProperties + ); + + STDMETHODIMP SetProperties( + DWORD cbProperties, + __in_bcount(cbProperties) const BYTE * pbProperties + ); +}; + + +//===================================================================== +//===================================================================== +// Defines CBaseAllocator +// +// Abstract base class that manages a list of media samples +// +// This class provides support for getting buffers from the free list, +// including handling of commit and (asynchronous) decommit. +// +// Derive from this class and override the Alloc and Free functions to +// allocate your CMediaSample (or derived) objects and add them to the +// free list, preparing them as necessary. +//===================================================================== +//===================================================================== + +class AM_NOVTABLE CBaseAllocator : public CUnknown,// A non delegating IUnknown + public IMemAllocatorCallbackTemp, // The interface we support + public CCritSec // Provides object locking +{ + class CSampleList; + friend class CSampleList; + + /* Trick to get at protected member in CMediaSample */ + static CMediaSample * &NextSample(__in CMediaSample *pSample) + { + return pSample->m_pNext; + }; + + /* Mini list class for the free list */ + class CSampleList + { + public: + CSampleList() : m_List(NULL), m_nOnList(0) {}; +#ifdef DEBUG + ~CSampleList() + { + ASSERT(m_nOnList == 0); + }; +#endif + CMediaSample *Head() const { return m_List; }; + CMediaSample *Next(__in CMediaSample *pSample) const { return CBaseAllocator::NextSample(pSample); }; + int GetCount() const { return m_nOnList; }; + void Add(__inout CMediaSample *pSample) + { + ASSERT(pSample != NULL); + CBaseAllocator::NextSample(pSample) = m_List; + m_List = pSample; + m_nOnList++; + }; + CMediaSample *RemoveHead() + { + CMediaSample *pSample = m_List; + if (pSample != NULL) { + m_List = CBaseAllocator::NextSample(m_List); + m_nOnList--; + } + return pSample; + }; + void Remove(__inout CMediaSample *pSample); + + public: + CMediaSample *m_List; + int m_nOnList; + }; +protected: + + CSampleList m_lFree; // Free list + + /* Note to overriders of CBaseAllocator. + + We use a lazy signalling mechanism for waiting for samples. + This means we don't call the OS if no waits occur. + + In order to implement this: + + 1. When a new sample is added to m_lFree call NotifySample() which + calls ReleaseSemaphore on m_hSem with a count of m_lWaiting and + sets m_lWaiting to 0. + This must all be done holding the allocator's critical section. + + 2. When waiting for a sample call SetWaiting() which increments + m_lWaiting BEFORE leaving the allocator's critical section. + + 3. Actually wait by calling WaitForSingleObject(m_hSem, INFINITE) + having left the allocator's critical section. The effect of + this is to remove 1 from the semaphore's count. You MUST call + this once having incremented m_lWaiting. + + The following are then true when the critical section is not held : + (let nWaiting = number about to wait or waiting) + + (1) if (m_lFree.GetCount() != 0) then (m_lWaiting == 0) + (2) m_lWaiting + Semaphore count == nWaiting + + We would deadlock if + nWaiting != 0 && + m_lFree.GetCount() != 0 && + Semaphore count == 0 + + But from (1) if m_lFree.GetCount() != 0 then m_lWaiting == 0 so + from (2) Semaphore count == nWaiting (which is non-0) so the + deadlock can't happen. + */ + + HANDLE m_hSem; // For signalling + long m_lWaiting; // Waiting for a free element + long m_lCount; // how many buffers we have agreed to provide + long m_lAllocated; // how many buffers are currently allocated + long m_lSize; // agreed size of each buffer + long m_lAlignment; // agreed alignment + long m_lPrefix; // agreed prefix (preceeds GetPointer() value) + BOOL m_bChanged; // Have the buffer requirements changed + + // if true, we are decommitted and can't allocate memory + BOOL m_bCommitted; + // if true, the decommit has happened, but we haven't called Free yet + // as there are still outstanding buffers + BOOL m_bDecommitInProgress; + + // Notification interface + IMemAllocatorNotifyCallbackTemp *m_pNotify; + + BOOL m_fEnableReleaseCallback; + + // called to decommit the memory when the last buffer is freed + // pure virtual - need to override this + virtual void Free(void) PURE; + + // override to allocate the memory when commit called + virtual HRESULT Alloc(void); + +public: + + CBaseAllocator( + __in_opt LPCTSTR , __inout_opt LPUNKNOWN, __inout HRESULT *, + BOOL bEvent = TRUE, BOOL fEnableReleaseCallback = FALSE); +#ifdef UNICODE + CBaseAllocator( + __in_opt LPCSTR , __inout_opt LPUNKNOWN, __inout HRESULT *, + BOOL bEvent = TRUE, BOOL fEnableReleaseCallback = FALSE); +#endif + virtual ~CBaseAllocator(); + + DECLARE_IUNKNOWN + + // override this to publicise our interfaces + STDMETHODIMP NonDelegatingQueryInterface(REFIID riid, __deref_out void **ppv); + + STDMETHODIMP SetProperties( + __in ALLOCATOR_PROPERTIES* pRequest, + __out ALLOCATOR_PROPERTIES* pActual); + + // return the properties actually being used on this allocator + STDMETHODIMP GetProperties( + __out ALLOCATOR_PROPERTIES* pProps); + + // override Commit to allocate memory. We handle the GetBuffer + //state changes + STDMETHODIMP Commit(); + + // override this to handle the memory freeing. We handle any outstanding + // GetBuffer calls + STDMETHODIMP Decommit(); + + // get container for a sample. Blocking, synchronous call to get the + // next free buffer (as represented by an IMediaSample interface). + // on return, the time etc properties will be invalid, but the buffer + // pointer and size will be correct. The two time parameters are + // optional and either may be NULL, they may alternatively be set to + // the start and end times the sample will have attached to it + // bPrevFramesSkipped is not used (used only by the video renderer's + // allocator where it affects quality management in direct draw). + + STDMETHODIMP GetBuffer(__deref_out IMediaSample **ppBuffer, + __in_opt REFERENCE_TIME * pStartTime, + __in_opt REFERENCE_TIME * pEndTime, + DWORD dwFlags); + + // final release of a CMediaSample will call this + STDMETHODIMP ReleaseBuffer(IMediaSample *pBuffer); + // obsolete:: virtual void PutOnFreeList(CMediaSample * pSample); + + STDMETHODIMP SetNotify(IMemAllocatorNotifyCallbackTemp *pNotify); + + STDMETHODIMP GetFreeCount(__out LONG *plBuffersFree); + + // Notify that a sample is available + void NotifySample(); + + // Notify that we're waiting for a sample + void SetWaiting() { m_lWaiting++; }; +}; + + +//===================================================================== +//===================================================================== +// Defines CMemAllocator +// +// this is an allocator based on CBaseAllocator that allocates sample +// buffers in main memory (from 'new'). You must call SetProperties +// before calling Commit. +// +// we don't free the memory when going into Decommit state. The simplest +// way to implement this without complicating CBaseAllocator is to +// have a Free() function, called to go into decommit state, that does +// nothing and a ReallyFree function called from our destructor that +// actually frees the memory. +//===================================================================== +//===================================================================== + +// Make me one from quartz.dll +STDAPI CreateMemoryAllocator(__deref_out IMemAllocator **ppAllocator); + +class CMemAllocator : public CBaseAllocator +{ + +protected: + + LPBYTE m_pBuffer; // combined memory for all buffers + + // override to free the memory when decommit completes + // - we actually do nothing, and save the memory until deletion. + void Free(void); + + // called from the destructor (and from Alloc if changing size/count) to + // actually free up the memory + void ReallyFree(void); + + // overriden to allocate the memory when commit called + HRESULT Alloc(void); + +public: + /* This goes in the factory template table to create new instances */ + static CUnknown *CreateInstance(__inout_opt LPUNKNOWN, __inout HRESULT *); + + STDMETHODIMP SetProperties( + __in ALLOCATOR_PROPERTIES* pRequest, + __out ALLOCATOR_PROPERTIES* pActual); + + CMemAllocator(__in_opt LPCTSTR , __inout_opt LPUNKNOWN, __inout HRESULT *); +#ifdef UNICODE + CMemAllocator(__in_opt LPCSTR , __inout_opt LPUNKNOWN, __inout HRESULT *); +#endif + ~CMemAllocator(); +}; + +// helper used by IAMovieSetup implementation +STDAPI +AMovieSetupRegisterFilter( const AMOVIESETUP_FILTER * const psetupdata + , IFilterMapper * pIFM + , BOOL bRegister ); + + +/////////////////////////////////////////////////////////////////////////// +// ------------------------------------------------------------------------ +// ------------------------------------------------------------------------ +// ------------------------------------------------------------------------ +// ------------------------------------------------------------------------ +/////////////////////////////////////////////////////////////////////////// + +#endif /* __FILTER__ */ + + + |
