Inference rule for ph_poc_msb_cycle_present_flag

[naeri.park]

According to clause 8.3.1, ph_poc_msb_cycle_present_flag is used on derivation process of POC.
However, since ph_poc_msb_cycle_present_flag is used to derive the MSB of POC (PicOrderCntMsb), even though ph_poc_msb_cycle_present_flag is not present, decoder may derive the value of PicOrderCntMsb incorrectly.

Therefore, the inference rule of ph_poc_msb_cycle_present_flag is required. The possible solution adding editorial change is as follows.

ph_poc_msb_cycle_present_flag equal to 1 specifies that the syntax element ph_poc_msb_cycle_val is present in the PH and used for deriving the value of PicOrderCntMsb. ph_poc_msb_cycle_present_flag equal to 0 specifies that the syntax element ph_poc_msb_cycle_val is not present in the PH. When not present, ph_poc_msb_cycle_present_flag is inferred to be equal to 0. When vps_independent_layer_flag[ GeneralLayerIdx[ nuh_layer_id ] ] is equal to 0 and there is a picture in the current AU in a reference layer of the current layer, the value of ph_poc_msb_cycle_present_flag shall be equal to 0.

[yk]

Thanks! Resolved by a noted action in response to S0239.