 in the range of ( DQIdMax 4) to DQIdMax >> << 4 + 15), inclusive, the last of these buffering period SEI messages in decoding order is the activating buffering period SEI message. Otherwise, if DQIdMax is equal to 0 and the access unit contains a buffering period SEI message that is not included in a scalable nesting SEI message, this buffering period SEI message is the activating buffering period SEI message. Rec. ITU-T H.264 (01/2012) Otherwise, the access unit does not contain an activating buffering period SEI message. When a sequence parameter set RBSP (nal_unit_t type is equal to 7) with a particular value of seq parameter_set_id is already the active SVC sequence parameter set RBSP and it is referred to by activation of a picture parameter set RBSP (using that value of seq_parameter_set_id) : and the picture parameter set RBSP is activated by a coded slice NAL unit with nal_unit_type equalto lor 5 (the picture parameter set RBSP becomes the active picture parameter set RBSP and DQIdMax is equal to 0) and the access unit does not contain an activating buffering period SEI message, the sequence parameter set RBSP is activated. This sequence parameter set RBSP, is called the active SVC sequence parameter set RBSP until it is deactivated when another SVC sequence parameter set RBSP becomes the active SVC sequence parameter set RBSP. A sequence parameter set RBSP, with that particular value of seq_parameter_set_id, shall be available to the decoding process prior to its activation. When a sequence parameter set RBSP type is equal to 7) with a particular value of eq_parameter_set_idi is already the active SVC sequence parameter set RBSP and it is referred to by an activating buffering period SEI message (using that value of seq_parameter_set_id] that is not included in a scalable nesting SEI message (DQIdMax is equal to 0), the sequence parameter set RBSP is activated. This sequence parameter set RBSP is called the active SVC sequence parameter set RBSP until it is deactivated when another SVC sequence paramete