luma samples of a layer frame for the layer pictures that may be used for inter-layer prediction. When ref_layer_chroma_phase_x_plus1_flagis not present, it shall be inferred as follows: If quality_i id is greater than 0, ef_layer_chroma_phase_x_plus1_flag is inferred to be equal to hroma_phase_x_plus1_flag. Otherwise (quality_id is equal to 0), ef_layer_chroma_phase_x_plus1_flag is inferred to be equal to seq_ref_layer_chroma_phase_x_plus1_flag. When oninter_layer_pred_flag is equal to 0, the following is specified: a) When ref_layer_dq_id is greater than 0, ef_layer_chroma_phase_x_plus1_flag should be equal to chroma of the subset sequence parameter set RBSP that is referred to by the reference layer representation(withDQIdequal to ref_layer_dq_id). b) When RefLayerChromaArrayType is equal to 1 and chroma_sample_loc_type_top_field and chroma_sample_loc_type_bottom_field are present in the SVC sequence parameter set that is referred to by the reference layer representation (with DQId equal to ref_layer_dq_id), the following applies: If ef_layer_chroma_phase_x_plus1_flag is equal to 0, chroma_sample_loc_type_top_field and chroma_sample_loc_type_bottom_field of the SVC sequence parameter set that is referred to by the reference layer representation should be equal to 0, 2, or 4. Otherwise (ref_layer_chroma_phase_x_plus1_flag is equal to 1), chroma_sample_loc_type_top_field and chroma_sample_loc_type_bottom_field of the SVC sequence parameter set that is referred to by the reference layer representation should be equal to 1, 3, or 5. c) When RefLayerChromaArrayType is not equal to 1, ref_layer_chroma_phase_x_plus1_flag should be equal to 1. ef_layer_chroma phase y plus1 specifies the vertical phase shift of the chroma components in units of half luma samples of a layer frame for the layer pictures that may be used for inter-layer prediction. When phase plus1 is not present, it shall be inferred as follows: If quality_ id is greater than 0, ref_layer_chroma_phase_y_plusl is inferred to be equal to chroma_phase_y_plu