uac2_feature_unit_descriptor
static struct uac2_feature_unit_descriptor *in_feature_unit_desc;
static struct uac2_feature_unit_descriptor *out_feature_unit_desc;
static struct uac2_feature_unit_descriptor *build_fu_desc(int chmask)
struct uac2_feature_unit_descriptor *fu_desc;
struct uac2_feature_unit_descriptor *ftr = _ftr;
const struct uac2_feature_unit_descriptor *d = p;