DV (Digital Video) Capture

  1. To begin simple digital video capturing, create an instance of the ltmmCapture class. This is accomplished using the Win32 CoCreateInstance function as follows:

C Source

IltmmCapture* pCapture; 
CoCreateInstance(&CLSID_ltmmCapture, NULL, CLSCTX_INPROC_SERVER, &IID_IltmmCapture, (void**) &pCapture); 

C++ Source

IltmmCapture* pCapture;  
CoCreateInstance(CLSID_ltmmCapture, NULL, CLSCTX_INPROC_SERVER, IID_IltmmCapture, (void**) &pCapture); 

  1. Define video devices to be used as the capture source. The ltmmCapture object contains video device collection objects. The first video device can be selected for capture by calling the device collections put_Selection function:

C Source

IltmmDevices* pDevices; 
// get an interface into video devices collection 
IltmmCapture_get_VideoDevices(pCapture, &pDevices); 
// select the first video device 
IltmmDevices_put_Selection (pDevices, 0); 
// release collection 
IUnknown_Release(pDevices); 

C++ Source

IltmmDevices* pDevices;  
// get an interface into video devices collection 
pCapture->get_VideoDevices(&pDevices); 
// select device 
pDevices->put_Selection(0); 
// release collection 
pDevices->Release(); 

  1. Now start capturing, as demonstrated with the following code:

C Source

// start capturing 
IltmmCapture_StartCapture(pCapture, ltmmCapture_Mode_VideoOrAudio); 

C++ Source

// start capturing 
pCapture->StartCapture (ltmmCapture_Mode_VideoOrAudio); 

4.At the end, stop capturing and recording, as demonstrated with the following code:

C Source

// stop capturing 
IltmmCapture_StopCapture(pCapture); 

C++ Source

// stop capturing 
pCapture->StopCapture (); 

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