Get the list of supported viewfinder resolutions for a given frame type
#include <camera/camera_api.h>
camera_error_t camera_get_specified_vf_resolutions(camera_handle_t handle, camera_frametype_t frametype, uint32_t numasked, uint32_t *numsupported, camera_res_t *resolutions)
After you use this function to retrieve the viewfinder resolutions that are supported by the camera, you can configure the viewfinder size using camera_set_vf_property().
Ensure that the resolutions argument points to an array that has at least numasked elements allocated. To determine an appropriate size for this array, you can invoke this function in presizing mode by setting the numasked argument to 0 or the resolutions argument to NULL. When the function is invoked in this presizing mode, the maximum array size required is returned in the numsupported argument. You can then allocate an array of the appropriate size and invoke the function again with the numasked argument set to the value returned previously in the numsupported argument.
CAMERA_EOK when the function successfully completes, otherwise another camera_error_t value that provides the reason that the call failed.