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Diffstat (limited to 'thirdparties/win32/include/directshow/source.h')
| -rw-r--r-- | thirdparties/win32/include/directshow/source.h | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/thirdparties/win32/include/directshow/source.h b/thirdparties/win32/include/directshow/source.h new file mode 100644 index 0000000..e6e451b --- /dev/null +++ b/thirdparties/win32/include/directshow/source.h @@ -0,0 +1,172 @@ +//------------------------------------------------------------------------------ +// File: Source.h +// +// Desc: DirectShow base classes - defines classes to simplify creation of +// ActiveX source filters that support continuous generation of data. +// No support is provided for IMediaControl or IMediaPosition. +// +// Copyright (c) 1992-2001 Microsoft Corporation. All rights reserved. +//------------------------------------------------------------------------------ + + +// +// Derive your source filter from CSource. +// During construction either: +// Create some CSourceStream objects to manage your pins +// Provide the user with a means of doing so eg, an IPersistFile interface. +// +// CSource provides: +// IBaseFilter interface management +// IMediaFilter interface management, via CBaseFilter +// Pin counting for CBaseFilter +// +// Derive a class from CSourceStream to manage your output pin types +// Implement GetMediaType/1 to return the type you support. If you support multiple +// types then overide GetMediaType/3, CheckMediaType and GetMediaTypeCount. +// Implement Fillbuffer() to put data into one buffer. +// +// CSourceStream provides: +// IPin management via CBaseOutputPin +// Worker thread management + +#ifndef __CSOURCE__ +#define __CSOURCE__ + +class CSourceStream; // The class that will handle each pin + + +// +// CSource +// +// Override construction to provide a means of creating +// CSourceStream derived objects - ie a way of creating pins. +class CSource : public CBaseFilter { +public: + + CSource(__in_opt LPCTSTR pName, __inout_opt LPUNKNOWN lpunk, CLSID clsid, __inout HRESULT *phr); + CSource(__in_opt LPCTSTR pName, __inout_opt LPUNKNOWN lpunk, CLSID clsid); +#ifdef UNICODE + CSource(__in_opt LPCSTR pName, __inout_opt LPUNKNOWN lpunk, CLSID clsid, __inout HRESULT *phr); + CSource(__in_opt LPCSTR pName, __inout_opt LPUNKNOWN lpunk, CLSID clsid); +#endif + ~CSource(); + + int GetPinCount(void); + CBasePin *GetPin(int n); + + // -- Utilities -- + + CCritSec* pStateLock(void) { return &m_cStateLock; } // provide our critical section + + HRESULT AddPin(__in CSourceStream *); + HRESULT RemovePin(__in CSourceStream *); + + STDMETHODIMP FindPin( + LPCWSTR Id, + __deref_out IPin ** ppPin + ); + + int FindPinNumber(__in IPin *iPin); + +protected: + + int m_iPins; // The number of pins on this filter. Updated by CSourceStream + // constructors & destructors. + CSourceStream **m_paStreams; // the pins on this filter. + + CCritSec m_cStateLock; // Lock this to serialize function accesses to the filter state + +}; + + +// +// CSourceStream +// +// Use this class to manage a stream of data that comes from a +// pin. +// Uses a worker thread to put data on the pin. +class CSourceStream : public CAMThread, public CBaseOutputPin { +public: + + CSourceStream(__in_opt LPCTSTR pObjectName, + __inout HRESULT *phr, + __inout CSource *pms, + __in_opt LPCWSTR pName); +#ifdef UNICODE + CSourceStream(__in_opt LPCSTR pObjectName, + __inout HRESULT *phr, + __inout CSource *pms, + __in_opt LPCWSTR pName); +#endif + virtual ~CSourceStream(void); // virtual destructor ensures derived class destructors are called too. + +protected: + + CSource *m_pFilter; // The parent of this stream + + // * + // * Data Source + // * + // * The following three functions: FillBuffer, OnThreadCreate/Destroy, are + // * called from within the ThreadProc. They are used in the creation of + // * the media samples this pin will provide + // * + + // Override this to provide the worker thread a means + // of processing a buffer + virtual HRESULT FillBuffer(IMediaSample *pSamp) PURE; + + // Called as the thread is created/destroyed - use to perform + // jobs such as start/stop streaming mode + // If OnThreadCreate returns an error the thread will exit. + virtual HRESULT OnThreadCreate(void) {return NOERROR;}; + virtual HRESULT OnThreadDestroy(void) {return NOERROR;}; + virtual HRESULT OnThreadStartPlay(void) {return NOERROR;}; + + // * + // * Worker Thread + // * + + HRESULT Active(void); // Starts up the worker thread + HRESULT Inactive(void); // Exits the worker thread. + +public: + // thread commands + enum Command {CMD_INIT, CMD_PAUSE, CMD_RUN, CMD_STOP, CMD_EXIT}; + HRESULT Init(void) { return CallWorker(CMD_INIT); } + HRESULT Exit(void) { return CallWorker(CMD_EXIT); } + HRESULT Run(void) { return CallWorker(CMD_RUN); } + HRESULT Pause(void) { return CallWorker(CMD_PAUSE); } + HRESULT Stop(void) { return CallWorker(CMD_STOP); } + +protected: + Command GetRequest(void) { return (Command) CAMThread::GetRequest(); } + BOOL CheckRequest(Command *pCom) { return CAMThread::CheckRequest( (DWORD *) pCom); } + + // override these if you want to add thread commands + virtual DWORD ThreadProc(void); // the thread function + + virtual HRESULT DoBufferProcessingLoop(void); // the loop executed whilst running + + + // * + // * AM_MEDIA_TYPE support + // * + + // If you support more than one media type then override these 2 functions + virtual HRESULT CheckMediaType(const CMediaType *pMediaType); + virtual HRESULT GetMediaType(int iPosition, __inout CMediaType *pMediaType); // List pos. 0-n + + // If you support only one type then override this fn. + // This will only be called by the default implementations + // of CheckMediaType and GetMediaType(int, CMediaType*) + // You must override this fn. or the above 2! + virtual HRESULT GetMediaType(__inout CMediaType *pMediaType) {return E_UNEXPECTED;} + + STDMETHODIMP QueryId( + __deref_out LPWSTR * Id + ); +}; + +#endif // __CSOURCE__ + |
