Hi Hans, On Wed, Mar 11, 2015 at 01:00:45PM +0100, Hans Verkuil wrote: > The documentation says that the bytesperline field in v4l2_pix_format refers > to the largest plane in the case of planar formats (i.e. multiple planes > stores in a single buffer). > > For almost all planar formats the first plane is also the largest (or equal) > plane, except for two formats: V4L2_PIX_FMT_NV24/NV42. For this YUV 4:4:4 > format the second chroma plane is twice the size of the first luma plane. > > Looking at the very few drivers that support this format the bytesperline > value that they report is actually that of the first plane and not that > of the largest plane. > > Rather than fixing the drivers it makes more sense to update the documentation > since it is very difficult to use the largest plane for this. You would have > to check what the format is in order to know to which plane bytesperline > belongs, which makes calculations much more difficult. > > This patch updates the documentation accordingly. > > Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx> Acked-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx> -- Sakari Ailus e-mail: sakari.ailus@xxxxxx XMPP: sailus@xxxxxxxxxxxxxx -- 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
