[vlc-devel] Offsets, plane_CopyPixels() and deinterlace

Laurent Aimar fenrir at elivagar.org
Sun May 8 19:39:54 CEST 2011

On Sun, May 08, 2011 at 08:29:17PM +0300, Juha Jeronen wrote:
> >  plane_t::i_visible_* are there to know which part of the memory planes can at
> > most be displayed. Usually there are different than the whole surface due to memory
> > alignment constraints (like mod 16 for SSE2 or to be alligned on a macroblock).
> > Those values are decided when the picture is allocated and they usually don't change
> > for a given picture pointer (but they can change, like in direct3d buffers).
> >
> >  While video_format_t:i_visible_width/height and i_x/y_offset are more a 'hint'
> > regarding what will be actually displayed. A filter should update filter_t::fmt_out
> > if needed to ensure that the allocated pictures get the right value. I don't think
> > a filter should limit to this area as dynamic crop setting is supported.
> Ok. So basically, it's fine in a filter to handle the
> plane_t::i_visible_* area - which should include margins and only adjust
> for memory alignment - and let the cropping be performed elsewhere. In
> this case the current version of deinterlace is correct.


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