138 lines
4.6 KiB
C++
138 lines
4.6 KiB
C++
//------------------------------------------------------------------------------
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// File: OutputQ.h
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//
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// Desc: DirectShow base classes - defines the COutputQueue class, which
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// makes a queue of samples and sends them to an output pin. The
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// class will optionally send the samples to the pin directly.
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//
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// Copyright (c) 1992-2001 Microsoft Corporation. All rights reserved.
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//------------------------------------------------------------------------------
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typedef CGenericList<IMediaSample> CSampleList;
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class COutputQueue : public CCritSec
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{
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public:
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// Constructor
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COutputQueue(IPin *pInputPin, // Pin to send stuff to
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HRESULT *phr, // 'Return code'
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BOOL bAuto = TRUE, // Ask pin if blocks
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BOOL bQueue = TRUE, // Send through queue (ignored if
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// bAuto set)
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LONG lBatchSize = 1, // Batch
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BOOL bBatchExact = FALSE,// Batch exactly to BatchSize
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LONG lListSize = // Likely number in the list
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DEFAULTCACHE,
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DWORD dwPriority = // Priority of thread to create
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THREAD_PRIORITY_NORMAL,
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bool bFlushingOpt = false // flushing optimization
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);
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~COutputQueue();
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// enter flush state - discard all data
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void BeginFlush(); // Begin flushing samples
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// re-enable receives (pass this downstream)
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void EndFlush(); // Complete flush of samples - downstream
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// pin guaranteed not to block at this stage
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void EOS(); // Call this on End of stream
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void SendAnyway(); // Send batched samples anyway (if bBatchExact set)
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void NewSegment(
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REFERENCE_TIME tStart,
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REFERENCE_TIME tStop,
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double dRate);
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HRESULT Receive(IMediaSample *pSample);
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// do something with these media samples
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HRESULT ReceiveMultiple (
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IMediaSample **pSamples,
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long nSamples,
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long *nSamplesProcessed);
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void Reset(); // Reset m_hr ready for more data
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// See if its idle or not
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BOOL IsIdle();
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// give the class an event to fire after everything removed from the queue
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void SetPopEvent(HANDLE hEvent);
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protected:
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static DWORD WINAPI InitialThreadProc(LPVOID pv);
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DWORD ThreadProc();
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BOOL IsQueued()
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{
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return m_List != NULL;
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};
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// The critical section MUST be held when this is called
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void QueueSample(IMediaSample *pSample);
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BOOL IsSpecialSample(IMediaSample *pSample)
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{
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return (DWORD_PTR)pSample > (DWORD_PTR)(LONG_PTR)(-16);
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};
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// Remove and Release() batched and queued samples
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void FreeSamples();
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// Notify the thread there is something to do
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void NotifyThread();
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protected:
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// Queue 'messages'
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#define SEND_PACKET ((IMediaSample *)(LONG_PTR)(-2)) // Send batch
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#define EOS_PACKET ((IMediaSample *)(LONG_PTR)(-3)) // End of stream
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#define RESET_PACKET ((IMediaSample *)(LONG_PTR)(-4)) // Reset m_hr
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#define NEW_SEGMENT ((IMediaSample *)(LONG_PTR)(-5)) // send NewSegment
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// new segment packet is always followed by one of these
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struct NewSegmentPacket {
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REFERENCE_TIME tStart;
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REFERENCE_TIME tStop;
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double dRate;
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};
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// Remember input stuff
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IPin * const m_pPin;
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IMemInputPin * m_pInputPin;
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BOOL const m_bBatchExact;
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LONG const m_lBatchSize;
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CSampleList * m_List;
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HANDLE m_hSem;
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CAMEvent m_evFlushComplete;
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HANDLE m_hThread;
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IMediaSample ** m_ppSamples;
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LONG m_nBatched;
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// Wait optimization
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LONG m_lWaiting;
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// Flush synchronization
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BOOL m_bFlushing;
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// flushing optimization. some downstream filters have trouble
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// with the queue's flushing optimization. other rely on it
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BOOL m_bFlushed;
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bool m_bFlushingOpt;
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// Terminate now
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BOOL m_bTerminate;
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// Send anyway flag for batching
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BOOL m_bSendAnyway;
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// Deferred 'return code'
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BOOL volatile m_hr;
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// an event that can be fired after every deliver
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HANDLE m_hEventPop;
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};
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