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VideoWriter.h

/*
 *  Copyright (c) 2000, University of Amsterdam, The Netherlands.
 *  All rights reserved.
 *
 *  Author(s):
 *  Marc Navarro            (mnavarro@wins.uva.nl)
 */

#include <streams.h>
#include "atlbase.h"

#include "IPutFrame.h"

class VideoWriter : public IPutFrameController
{
public:
                                VideoWriter(const char* name, int w, int h);
    virtual                     ~VideoWriter();
    int                         isNull();

    void                        putFrame(BYTE* data);

    //IPutFrameController:
    STDMETHODIMP                FillNextData(BYTE* data);
    STDMETHODIMP                GetDataSizes(int* width, int* height);

    //IUnknown:
    STDMETHODIMP                QueryInterface(const IID& riid, void** ppv);
    STDMETHODIMP_(ULONG)        AddRef();
    STDMETHODIMP_(ULONG)        Release();

private:

    HRESULT                     buildGraph(const char* filename);
    HRESULT                     showError(const char* msg, HRESULT hr);
    HRESULT                     init(const char* filename, int w, int h);

    void                        stopWriting();
    HRESULT                     emptyData(BYTE* data);

    void                        trace(const char* msg);

    BYTE*                       _data;
    int                         _width;
    int                         _height;

    // Synchronize access to _data:
    // "Graph" thread can not access _data till some data is available
    // and "CORBA" thread can not put new data till _data has been processed
    // by "Graph thread".
    //
    // "Graph" thread waits on _newDataEvent and notifies _dataUsedEvent
    // "CORBA" thread waits on _dataUsedEvent and notifies _newDataEvent
    CAMEvent                    _newDataEvent;
    CAMEvent                    _dataUsedEvent;

    CComPtr<IGraphBuilder>      _iBuilder;
    CComPtr<IMediaControl>      _imCtrl;
    CComPtr<IMediaEvent>        _imEvent;
    CComPtr<IMediaEventSink>    _imEvSink;

    int                         _stopping;
};

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