[FFmpeg-devel] 4xm idct computation

[yann.lepetitcorps at free.fr]

Selon Michael Niedermayer <michaelni at gmx.at>:

> On Wed, Dec 28, 2011 at 05:07:43AM +0100, yann.lepetitcorps at free.fr wrote:
> > Selon yann.lepetitcorps at free.fr:
> >
> > > Hi,
> > >
> > > I have take a look into the libavcodec/4xm.c
> > > => can the IDCT to be remplaced by something more simpler like Haar
> wavelets
> > > ?
> > > (for to can be accellerated by MMX instructions for example)
> > >
> > >
> > > @+
> > > Yannoo
> > > _______________________________________________
> > > ffmpeg-devel mailing list
> > > ffmpeg-devel at ffmpeg.org
> > > http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
> > >
> >
> > More precisely, I search an encoder/decoder that work like the DCT/iDCT but
> with
> > the De Haar, Debauchies and/or others lifting schemes transforms instead
> the
> > [Fast] Fourrier Transform
>
> look at dirac, snow, indeo4/5 and jpeg2000 they use things in that
> direction. most are not block based though
>
> [...]
> --
> Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
>
> Let us carefully observe those good qualities wherein our enemies excel us
> and endeavor to excel them, by avoiding what is faulty, and imitating what
> is excellent in them. -- Plutarch
>

This is my problem, I search something that is "only partially block based" :)
(cf. that work on fixed 8x8 blocs, but where the blocs are dynamically
constructed from a "mipmapped" picture)


@+
Yannoo