[FFmpeg-devel] JPEG2000 decoder

[Michael Niedermayer]

On Fri, Jun 03, 2011 at 02:25:26AM -0700, rukhsana afroz wrote:
> Hi Michael,
> 
> On Wed, Jun 1, 2011 at 3:42 AM, rukhsana afroz <rukhsana.afroz at gmail.com>wrote:
> 
> > Hi Michael,
> >
> >> maybe jaspers and ours advance the pointer at a slightly different
> >> spot in the implementation
> >>
> >>
> > As per the discussion on IRC chat, I checked where s->bit_index gets
> > modified. I see, in our decoder that s->bit_index has been manually set to 8
> > at the beginning of decoding packet. whereas, in jasper, I did not see this.
> > Also, jasper always reads the entire byte to check present bit even for
> > other files, like file1.jp2 etc. Whereas, our decoder does not do so. I need
> > your suggestion on this as i do not find any clue in the doc for this. I am
> > waiting for you on the IRC chat.
> >
> >
> >
> >
> >
> I have rebased the codebase against ffmpeg and also decode_packet function
> works properly comparing with jasper. However, it gets segmentation fault
> somewhere in decode_cblk function for adding new code. Tomorrow I will be in
> chat to discuss this code. My new code rebased with ffmpeg is in:
> 
> https://github.com/rukhsana/ffmpeg_j2k

thanks

btw

floor_log2() can be replaced by av_log2()


[...]
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Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

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