cx18_vb2_buffer
struct cx18_vb2_buffer *vb_buf;
vb_buf = list_first_entry(&s->vb_capture, struct cx18_vb2_buffer,
struct cx18_vb2_buffer *buf =
container_of(vbuf, struct cx18_vb2_buffer, vb);
struct cx18_vb2_buffer *buf;
struct cx18_vb2_buffer, list);
s->vidq.buf_struct_size = sizeof(struct cx18_vb2_buffer);