[XviD-devel] zig-zag
skal
skal at planet-d.net
Wed Mar 12 10:46:26 CET 2003
Hi Gruel,
On Wed, 2003-03-12 at 10:33, Christoph Lampert wrote:
> On Wed, 12 Mar 2003, Christoph Lampert wrote:
>
> >
> > Hi,
> >
> > is it possible to change zigzag order on block level? Or just on
> > per-frame-basis? Or is it automatically chosen based on interlace on/off?
>
> Just if somebody knows immediately, otherwise I'll look it up.
>
For intra-mb, in I-frame, the AC-prediction direction is
used to choose between horizontal/vertical scan. But in
interlaced mode, if the Alternate-vertical-flag is on,
it's always the vertical mode.
for intra-mb in a P-frame, with the flag off, it's the
"regular" order that is used.
For inter-mb, "regular" or "vertical" scan is chosen
according to the Alternate-vertical-flag...
(hope I didn't missed something)
bye,
Skal
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