[FFmpeg-devel] JPEG2000 decoder

[rukhsana afroz]

Hi Michael,

On Sun, Jul 3, 2011 at 12:11 AM, rukhsana afroz <rukhsana.afroz at gmail.com>wrote:

> Hi Michael,
>
>
> On Tue, Jun 21, 2011 at 7:54 PM, rukhsana afroz <rukhsana.afroz at gmail.com>wrote:
>
>> Hi Michael,
>>
>>
>> On Wed, Jun 15, 2011 at 10:29 PM, rukhsana afroz <
>> rukhsana.afroz at gmail.com> wrote:
>>
>>> Hi Michael,
>>>
>>>
>>> On Wed, Jun 8, 2011 at 5:19 PM, rukhsana afroz <rukhsana.afroz at gmail.com
>>> > wrote:
>>>
>>>> Hi Michael,
>>>>
>>>>
>>>> On Sat, Jun 4, 2011 at 5:23 PM, Michael Niedermayer <michaelni at gmx.at>wrote:
>>>>
>>>>> On Sat, Jun 04, 2011 at 06:06:51AM -0700, rukhsana afroz wrote:
>>>>> > Hi Michael,
>>>>> >
>>>>> > On Sat, Jun 4, 2011 at 5:26 AM, rukhsana afroz <
>>>>> rukhsana.afroz at gmail.com>wrote:
>>>>> >
>>>>> > > Hi Michael,
>>>>> > >
>>>>> > >
>>>>> > > On Fri, Jun 3, 2011 at 10:36 AM, Michael Niedermayer <
>>>>> michaelni at gmx.at>wrote:
>>>>> > >
>>>>> > >> 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()
>>>>> > >>
>>>>> > >>
>>>>> > > I have pushed another branch r2 now. Could you please help check
>>>>> whether
>>>>> > > the initialization of contexts (which has been done for every
>>>>> codeblock
>>>>>
>>>>
>
I need your help on fixing the bug I am working on. Right now, I am on IRC,
If you have time, I want to chat with you.

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