Opened 5 years ago
Closed 5 years ago
#781 closed defect (fixed)
correct calculation of subpicture layout syntax length
Reported by: | LIJINGYA | Owned by: | |
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Priority: | minor | Milestone: | |
Component: | spec | Version: | VVC D7 vE |
Keywords: | Cc: | ksuehring, bbross, XiangLi, fbossen, jvet@… |
Description
It is suggested to correct calculation of subpicture layout syntax length to cover the cover cases that subpicture width/height = cTbSizeY (Changes are highlighted in Bold):
subpic_ctu_top_left_x[ i ] specifies horizontal position of top left CTU of i-th subpicture in unit of CtbSizeY. The length of the syntax element is Max(1, Ceil( Log2(Ceil( pic_width_max_in_luma_samples / CtbSizeY) ) ) ) bits. When not present, the value of subpic_ctu_top_left_x[ i ] is inferred to be equal to 0.
subpic_ctu_top_left_y[ i ] specifies vertical position of top left CTU of i-th subpicture in unit of CtbSizeY. The length of the syntax element is Max(1, Ceil( Log2( Ceil( pic_height_max_in_luma_samples / CtbSizeY ) ) ) ) bits. When not present, the value of subpic_ctu_top_left_y[ i ] is inferred to be equal to 0.
subpic_width_minus1[ i ] plus 1 specifies the width of the i-th subpicture in units of CtbSizeY. The length of the syntax element is Max(1, Ceil( Log2( Ceil( pic_width_max_in_luma_samples / CtbSizeY ) ) ) ) bits. When not present, the value of subpic_width_minus1[ i ] is inferred to be equal to Ceil( pic_width_max_in_luma_samples / CtbSizeY ) − 1.
subpic_height_minus1[ i ] plus 1 specifies the height of the i-th subpicture in units of CtbSizeY. The length of the syntax element is Max(1, Ceil( Log2( Ceil( pic_height_max_in_luma_samples / CtbSizeY ) ) ) ) bits. When not present, the value of subpic_height_minus1[ i ] is inferred to be equal to Ceil( pic_height_max_in_luma_samples / CtbSizeY ) − 1.
Change history (1)
comment:1 Changed 5 years ago by vdrugeon
- Resolution set to fixed
- Status changed from new to closed
Solved by adoption of JVET-Q0787