It seems to be totally described in v4l2 api specification document. The document is saying like this: VIDIOC_QUERYCAP video input and video standard ioctls VIDIOC_G_FBUF and VIDIOC_S_FBUF VIDIOC_G_FMT/S_FMT/TRY_FMT VIDIOC_OVERLAY Take a look at the document for detailed usage. Cheers, Nate On Wed, Jun 10, 2009 at 6:13 PM, xie<yili.xie@xxxxxxxxx> wrote: > Dear all ~~ > > With your help I have implemented the preview with capture interface ~~ > Now i want to implement the preview with ovelay , and my camera support > s ovelay ~ > Who can tell me where I can find the document about ovelay sequcence ~ ? > Or does there have a standard example source code ~ ? > > Thanks a lot ~ > > Best regards > > -- = DongSoo, Nathaniel Kim Engineer Mobile S/W Platform Lab. Digital Media & Communications R&D Centre Samsung Electronics CO., LTD. e-mail : dongsoo.kim@xxxxxxxxx dongsoo45.kim@xxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html