UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE
as_out_type_i_desc.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(idx);
as_in_type_i_desc.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(idx);
.bLength = UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1),
if (desc->bLength == UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(1) &&