[FFmpeg-devel] JPEG2000 decoder

rukhsana afroz rukhsana.afroz at gmail.com
Fri Jun 3 11:25:26 CEST 2011

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:



>  --
Rukhsana Ruby
Phd Student
Department of Electrical & Computer Engineering
The University of British Columbia

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