cvSetCaptureProperty for CV_CAP_PROPS_FPS on Dshow CAM devices (Bug #2114)

Hi Marina,

find attached an example showing my issue. The example opens a CAM capture device (dshow on my windows XP) and queries frames of size 640*480 or 320*240 and displays them on the screen. While the first and second frame are captured correctly (setting first the fps, then width and height), the third returns a 640*480 frame.
Just changing the order how properties are set is a good work around.
Going through the code, I tried following modif, which worked for me.

bool CvCaptureCAM_DShow::setProperty( int property_id, double value )
{
 // some other code
 case CV_CAP_PROP_FPS:
        int fps = cvRound(value);
//JS        if (fps != VI.getFPS(index)) 
        if (fps != VI.getFPS(0))
       {   
//JS        int lwidth = VI.getWidth(index);
//JS        int lheight = VI.getHeight(index);
//JS        int lfourcc=VI.getFourcc(index); 
              VI.stopDevice(index);
              VI.setIdealFramerate(index,fps);
//JS          VI.setupDeviceFourcc(index, lwidth, lheight, lfourcc);           
              VI.setupDevice(index);
        }
        break;
// some more code
}

Regards

Juergen

Fix is pushed to 2.4