[XviD-devel] Query regarding pattern_code / coded block pattern /
engrsajidanwar at gmail.com
Sat Aug 30 12:04:36 CEST 2008
I am quite new to MPEG-4 and in the process of developing an mpeg4 SP
decoder.In this Xvid opensource is quite helpful. I have the following
1- how to find the cbp for a block. Is it same like pattern_code in ( ISO
6.2.7, Block( ) ) ? I think it represents coded blocks in the macroblock.
2- Can a block have Zero DC Coefficient ?
3- How to find that All AC Coefficients of a block or Zero ?
4- If the cbp/pattern_code is zero, then do we have to consider pDst[0-63] =
0 , meaning that all the coefficients are zero.
5- and Finally on line 80 in decoder.c the statement " if (quant <
intra_dc_threshold) " is used instead of use_intra_dc_VLC (ISO/IEC page 58,
MPEG4 Visual). I dont know how this can be used for this test.
Sorry for asking some poor questions but I am quite new to MPEG and need ur
help. Other wise i will be in great trouble. Thanks for your kind help.
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