opencv/modules/highgui/src/cap_dshow.cpp

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#include "precomp.hpp"

#if defined HAVE_VIDEOINPUT && (_MSC_VER >= 1400 || defined __GNUC__)

#include "videoinput.h"

/********************* Capturing video from camera via VFW *********************/

class CvCaptureCAM_DShow : public CvCapture
{
public:
    CvCaptureCAM_DShow();
    virtual ~CvCaptureCAM_DShow() { close(); }

    virtual bool open( int index );
    virtual void close();
    virtual double getProperty(int);
    virtual bool setProperty(int, double);
    virtual bool grabFrame();
    virtual IplImage* retrieveFrame(int);
	virtual int getCaptureDomain() { return CV_CAP_DSHOW; } // Return the type of the capture object: CV_CAP_VFW, etc...

protected:
    void init();

    int index;
    IplImage* frame;
    static videoInput VI;
};


struct SuppressVideoInputMessages
{
    SuppressVideoInputMessages() { videoInput::setVerbose(false); }
};

static SuppressVideoInputMessages do_it;
videoInput CvCaptureCAM_DShow::VI;

CvCaptureCAM_DShow::CvCaptureCAM_DShow()
{
    index = -1;
    frame = 0;
}

void CvCaptureCAM_DShow::close()
{
    if( index >= 0 )
    {
        VI.stopDevice(index);
        index = -1;
        cvReleaseImage(&frame);
    }
}

// Initialize camera input
bool CvCaptureCAM_DShow::open( int _index )
{
	int try_index = _index;
	int devices = 0;

    close();
    devices = VI.listDevices(true);
    if (devices == 0)
    	return false;
    try_index = try_index < 0 ? 0 : (try_index > devices-1 ? devices-1 : try_index);
    VI.setupDevice(try_index);
    if( !VI.isDeviceSetup(try_index) )
        return false;
    index = try_index;
    return true;
}

bool CvCaptureCAM_DShow::grabFrame()
{
    return true;
}


IplImage* CvCaptureCAM_DShow::retrieveFrame(int)
{
    if( !frame || VI.getWidth(index) != frame->width || VI.getHeight(index) != frame->height )
    {
        if (frame)
            cvReleaseImage( &frame );
        int w = VI.getWidth(index), h = VI.getHeight(index);
        frame = cvCreateImage( cvSize(w,h), 8, 3 );
    }

    VI.getPixels( index, (uchar*)frame->imageData, false, true );
    return frame;
}

double CvCaptureCAM_DShow::getProperty( int property_id )
{
    switch( property_id )
    {
    case CV_CAP_PROP_FRAME_WIDTH:
        return VI.getWidth(index);
    case CV_CAP_PROP_FRAME_HEIGHT:
        return VI.getHeight(index);
    case CV_CAP_PROP_FOURCC:
        return 0;
    }
    return 0;
}

bool CvCaptureCAM_DShow::setProperty( int property_id, double value )
{
    int width = 0, height = 0;

    switch( property_id )
    {
    case CV_CAP_PROP_FRAME_WIDTH:
        width = cvRound(value);
        height = width*3/4;
        break;
    case CV_CAP_PROP_FRAME_HEIGHT:
        height = cvRound(value);
        width = height*4/3;
    default:
        return false;
    }

    if( width != VI.getWidth(index) || height != VI.getHeight(index) )
    {
        VI.stopDevice(index);
        VI.setupDevice(index, width, height);
    }
    return VI.isDeviceSetup(index);
}


CvCapture* cvCreateCameraCapture_DShow( int index )
{
    CvCaptureCAM_DShow* capture = new CvCaptureCAM_DShow;

    if( capture->open( index ))
        return capture;

    delete capture;
    return 0;
}

#ifdef _MSC_VER
#if defined _M_X64
#pragma comment(lib, "videoInput64.lib")
#else
#pragma comment(lib, "videoInput.lib")
#endif
#endif

#endif