Output Format of a Video Device

Hello,

I am an absolute beginner in Media Foundation so I have a basic question. I am trying to find out the output format of a video device(my webcam) and print it out on screen. I want to figure out the major type and the subtype. So I want something like{ MFMediaType_Video, MFVideoFormat_RGB32 }.

This is what I have:

BYTE* my_name=NULL;
UINT32 size=0;

//m_ppDevices is a valid video capture device(webcam)	
m_ppDevices->GetBlobSize(MF_DEVSOURCE_ATTRIBUTE_MEDIA_TYPE, &size);	
my_name = new BYTE[size];

m_ppDevices->GetBlob(MF_DEVSOURCE_ATTRIBUTE_MEDIA_TYPE,my_name, size,NULL);

std::cout<<my_name<<std::endl;