ation of the current scalable layer is not present in the scalability information SEI message. The value oflayer_dependency_info_src_layer_id_delta[i] shall be in the range of 0 to layer_id[i inclusive. When layer_dependency_info_src_layer_id_delta[i] is greater than 0, the scalability information SEI message shall contain information for a scalable layer b with layer_id[b] equal ayer_id[i]-layer_dependency_info_src_layer_id_delta[i] - and this information shall not contain a value of yer_dependency_info_src_layer_id_delta[b] equal to 0. When layer_dependency_info_present_flag[ is equal to 0 and layer_dependency_info_src_layer_id_delta[i]is greater than 0, the set of scalable layers on which the current scalable layer depends shall be identical to the set of layers on which the scalable layer b with layer_id[b] equal to layer_id[i]-layer_dependency_info_src_layer_id_delta[i depends. Rec. ITU-T H.264 (01/2012) NOTE 15 - When layer_dependency_info_src_layer_id_delta[ equal to 0 is not present for the current scalable layer, the representation of the current scalable layer is specified by the syntax relementlayer_dependency_info_src_layer_id_delta[i syntax elements directly_dependent_layer_id_delta_minus1[i][j], 0..num_directly_dependent_layers[i] NOTE 16 - A change for the layer dependency information may be signalled by the presence of one or more layer dependency change SEI messages. When a scalability information SEI message specifies that a scalable layer A does not directly or indirectly depend on a scalable layer B, this relationship applies to the complete target access unit set. When a scalability information SEI message specifies that a scalable layer A does directly or indirectly depend on a scalable layer B, a following layer dependency change SEI message may indicate that this dependency does not apply for a subset of the target access unit set. aum_seq_parameter_sets| indicates the number of different sequence parameter sets that are referred to by the primary coded VCL NAL units of the current scalabl