IN_SRC_NUM_OF_INPUTS
uinfo->value.enumerated.items = IN_SRC_NUM_OF_INPUTS;
if (uinfo->value.enumerated.item >= IN_SRC_NUM_OF_INPUTS)
uinfo->value.enumerated.item = IN_SRC_NUM_OF_INPUTS - 1;
unsigned int items = IN_SRC_NUM_OF_INPUTS;