103 lines
2.4 KiB
C
103 lines
2.4 KiB
C
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/*
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* vcupriv.h
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*
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* 32-bit Video Capture driver
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* User-mode support library - private definitions
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*
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*
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* Geraint Davies, Feb 93
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*/
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/*
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* function codes that the calling thread can ask the worker thread to
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* perform
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*/
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typedef enum _VCFUNC {
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// arg result
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// --- ------
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AddBuffer, // lpVideoHdr BOOL bOK
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GetError, // <null> skip count
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StreamReset, // <null> BOOL bOK
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StreamFini, // <null> <null>
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StreamStart, // <null> <null>
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StreamStop, // <null> <null>
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InvalidFunction
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} VCFUNC, *PVCFUNC;
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/* we send this many buffers to the kernel at once */
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#define NR_SENT_BUFFERS 2
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/*
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* a capture device handle VCUSER_HANDLE is an opaque pointer
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* to one of these structures.
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*/
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struct _VCUSER_HANDLE {
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/* common data */
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HANDLE hDriver;
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PVCCALLBACK pCallback;
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/* inter-thread sync data */
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DWORD ThreadId;
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HANDLE hThread;
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VCFUNC FunctionCode;
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DWORD FunctionArg;
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DWORD FunctionResult;
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HANDLE hWorkEvent;
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HANDLE hCompleteEvent;
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/* worker thread data */
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HANDLE hEvents[2 + NR_SENT_BUFFERS]; // events to wait on
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LPVIDEOHDR lpBuffers[NR_SENT_BUFFERS]; // buffers with kernel
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int iSentCount; // count of buffers with kernel
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BOOL bWaitOutstanding; // true if a wait-error outstanding
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BOOL bReset; // streaming is reset-don't send requests
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BOOL bPartials; // using SYSBUF and PARTIAL_CAPTURE
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BOOL bCapOutstanding; // true if cap-to-sysbuf current
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DWORD WaitResult;
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DWORD SkipCount;
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OVERLAPPED overlapped[1 + NR_SENT_BUFFERS]; // 1 for each async i/o
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LPVIDEOHDR ListHead, ListTail; // local queue of add-buffers
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} VCUSER_STRUCT;
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/*
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* the worker thread starts execution at this function
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*/
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DWORD VC_ThreadInit(DWORD);
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/*
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* process a user request that needs to be handled on the
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* worker thread
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*
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* It returns the result of the operation in pResult, and returns
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* TRUE if the worker thread loop should terminate.
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*
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* This function will normally be called from the main
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* worker-thread event processing loop. However, it must be
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* called directly by the entrypoint functions if they
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* discover they are running on the worker thread (eg from a callback).
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* If this doesn't happen, we will enter deadlock with the worker thread
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* waiting for itself to signal an event.
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*/
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BOOL VC_ProcessFunction(VCUSER_HANDLE vh, VCFUNC Function, DWORD Param, LPDWORD pResult);
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