[Mp4-tech] about the parsing process of macroblock_layer( ) inH.264 decoding standart JVT_G050

[Dzung Hoang]

>From the standard, ¡°mb_qp_delta shall be inferred to be equal to 0 when it
is not present for any macroblock (including P_Skip and B_Skip macroblock
types).¡± Since no coefficients are transmitted, none needs to be inverse
quantized.
Regards,
- Dzung Hoang
  _____  
From: mp4-tech-bounces lists.mpegif.org
[mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Yan Zheng
Sent: Friday, September 01, 2023 2:38 AM
To: mp4-tech lists.mpegif.org
Subject: [Mp4-tech] about the parsing process of macroblock_layer( ) inH.264
decoding standart JVT_G050 
hello,
We find out that when decoding a macroblock of Intra_16x16(we use the
entropy encode/decode of CABAC), the process as following is unimaginable
skipped:
if(CodedBlockPatternLuma>0 || CodedBlockPatternChroma>0 ||
MbPartPredMode(mb_type,0)==Intra_16x16){
mb_qp_delta               se(v)|ae(v)
}
That means the SE of mb_qp_delta is not obtained by decoding the
bitstream.Then how JM  gets the SE value?is this SE value obtained through
other methods? (if so, how the standard be the standard?)
Thank you all.
  _____  
 <http://cn.mail.yahoo.com> ÇÀ×¢ÑÅ»¢Ãâ·ÑÓÊÏä-3.5GÈÝÁ¿£¬20M¸½¼þ£¡ 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: /pipermail/mp4-tech/attachments/20060904/d46601bf/attachment.html