V4L2_CTRL_FLAG_NEXT_COMPOUND
int next_compound = v4l2_id & V4L2_CTRL_FLAG_NEXT_COMPOUND;
(V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND);
const unsigned int next_flags = V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
if ((qc->id & next_flags) == V4L2_CTRL_FLAG_NEXT_COMPOUND) {