[FFmpeg-devel] DCT coeffs

Germán Milano g.milano87 at gmail.com
Thu Oct 27 13:42:49 CEST 2011


Thanks for the quick reply!, still i can't find the function where that
process is done. I can see the cabac decoding, the re ordering but i'm still
missing the dequant part... i'm probably running over it, because i can see
the dequant matrix initialization, of course.

Any suggestions?, could you point me out to the function i'm looking for?.

Thanks again!,


On Thu, Oct 27, 2011 at 9:14 AM, Michael Niedermayer <michaelni at gmx.at>wrote:

> On Thu, Oct 27, 2011 at 08:57:42AM -0200, Germán Milano wrote:
> > Hi everyone,
> >
> > I'm trying to recover DCT coefficients while decoding h264 using FFMPEG
> > libavcodec. It seems that in ff_h264_mb_decode_cabac, DCT coefficients
> are
> > re-ordered (zig zag ordering).
> > However i can't find where dequantification is made in order to find the
> > right DCT elements.
> > Can anybody help?
> dequant is done during coefficient decoding
> [...]
> --
> Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
> Breaking DRM is a little like attempting to break through a door even
> though the window is wide open and the only thing in the house is a bunch
> of things you dont want and which you would get tomorrow for free anyway
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