Returns frame buffer pointer and size.
PRL_RESULT PrlCVSrc_GetBuffer( PRL_HANDLE hCVSrc, PRL_VOID_PTR_PTR pPtr, PRL_UINT32_PTR uSize );
PrlApiVm.h
PRL_RESULT. Possible values: PRL_ERR_UNINITIALIZED - SDK was not properly initialized. PRL_ERR_INVALID_ARG - specified arguments are invalid. PRL_ERR_OUT_OF_MEMORY - not enough memory. PRL_ERR_SUCCESS - function completed successfully.
Source IO channel must be opened with PrlCVSrc_Open() and buffer must be locked with PrlCVSrc_LockBuffer().