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TVReader.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 "IGetFrame.h"
#include "DeviceEnumerator.h"

class TVReader : public IGetFrameController
{
public:
    static char**           listDevices();

                            TVReader(int nDevice);
    virtual                 ~TVReader();

    int                     isNull();

    BYTE*                   getFrame();     //dont call delete on result
    int                     getFrameWidth();
    int                     getFrameHeight();

    //IGetFrameController:
    STDMETHODIMP            NextData(BYTE *data);
    STDMETHODIMP            SetDataSizes(int width, int height,
                                         REFERENCE_TIME timePerFrame);

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

private:

    HRESULT                     buildGraph(int nDevice);
    HRESULT                     showError(const char* msg, HRESULT hr);
    HRESULT                     init(int nDevice);

    static DeviceEnumerator _enum;

    CCritSec                _critSec; // for locking critical sections

    BYTE*                   _currentData;
    BYTE*                   _newData;
    int                     _newAvailable;

    int                     _width;
    int                     _height;

    CComPtr<IGraphBuilder>  _iBuilder;
    CComPtr<IMediaControl>  _imCtrl;

};

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