[Ffmpeg-devel] [RFC] VC-1 I-frames decoder

[Kostya]

On Sun, Jun 18, 2006 at 01:14:17PM +0200, Michael Niedermayer wrote:
> Hi
> 
> On Sun, Jun 18, 2006 at 06:21:46AM +0300, Kostya wrote:
> > On Sat, Jun 17, 2006 at 12:52:34PM +0200, Michael Niedermayer wrote:
> > > Hi
> > > 
> > > On Sat, Jun 17, 2006 at 07:43:18AM +0300, Kostya wrote:
> > > > Here is my VC-1 decoder which decodes I-frames only. And not all of them are decoded properly too.
> > > > Nevertheless I want to get opinions on this implementation before moving to P-frames support.
> > > > P.S. If somebody will find and fix bugs in AC prediction it would be incredibly great.
> > > 
> > > hmm, are ac predicted coeffs dequantized in non-coded blocks?
> > 
> > If AC prediction is present then some AC coeffs are copied from previous block and dequantized
> > no matter was block coded or not.
> 
> i can see that part in your latest patch but i dont see where that would
> have been done in your previous patch which was the latest when i wrote my
> reply ...
> 
Applied inverse quantization to AC coeffs in non-coded blocks and rearranged a bit.
> 
[skipped a bit]
> 
> your latest patch also copies the ac prediction around even if ac_pred=0
> i dont think thats correct ...
You're right but it was not triggered so no visual changes.
> 
> [...]
> -- 
> Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
> 
> In the past you could go to a library and read, borrow or copy any book
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