Hi Michael, On Fri, May 20, 2011 at 10:49 PM, rukhsana afroz <[email protected]>wrote:
> Hi Michael, > > > On Thu, May 19, 2011 at 3:38 PM, rukhsana afroz > <[email protected]>wrote: > >> >> >> On Thu, May 19, 2011 at 3:32 PM, rukhsana afroz <[email protected] >> > wrote: >> >>> Hi Michael, >>> >>> >>> On Sun, May 15, 2011 at 5:00 PM, Michael Niedermayer >>> <[email protected]>wrote: >>> >>>> >>>> We will have to implement multiple codeword segments. >>>> >>>> Also sofar, good work! >>>> >>>> >>> Sorry for the late reply. If I implement codeblock segment, its going to >>> affect from packet decoding process to the subsequent deoding process till >>> the last. Therefore, I have to be properly planned in order to accomplish >>> these changes. Here, I have put patch for incorporating multiple codeblock >>> segment. I had to create two more structures and modify J2KCblk sturucture >>> as well. This patch is just for the modification/creation on the structures. >>> I am also writing some miscellaneous function and I will post those in my >>> subsequent emails. >>> >> > I have modified the decode_packet function incorporating multiple codeword > segment. Here, I have attached the patch for the required changes. I have > taken the help from jasper code while writing this code, because only the > document is not sufficient to incorporate these changes. I have not tested > this code yet. Once, I test it, I also let you know. If you have any > suggestion on this patch, please let me know. > > > While doing arithmetic coding operation in decode_cblk function one term/variable is "bpno". Coding operation (decode_sigpass, decode_refpass, decode_clpass) uses this variable to determine the data of each codeblock in different contexts. This variable has been set in our decoder: bpno = cblk->nonzerobits - 1 And, jasper has set this variable as follows: bpno = band->roishift + band->numbps - 1 - (cblk->numimsbs + (seg->passno + i - cblk->firstpassno + 2) / 3); band->roishift is the value got from processing the RGN marker and band->numbps is also the value got from some other marker. Our decoder has not processed this marker. cblk->numimsbs is similar to our decoder's cblk->nonzerobits. Other part of this variable is segment specific and that makes sense. I need you suggestion on how to set this variable. I will explain more tomorrow on IRC chat. Thanks - Rukhsana Ruby Phd Student Department of Electrical & Computer Engineering The University of British Columbia ============================
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