Depending on separate_colour_plane_flag, the following applies: If separate_colour_plane_flag is equal to 0, the reference picture sample arrays refPicLX, refPicLXcb (if available), and refPicLXcr (if available) correspond to decoded sample arrays SL, Scb (if available), Scr (if available) derived in clause 8.7 for a previously-decoded reference field or reference frame or complementary reference field pair or field of a reference frame. Otherwise (separate_colour_plane_flag is equal to 1), the following applies: If colour plane_ is equal to 0, the reference picture sample array refPicLX corresponds to the decoded sample array SL derived in clause 8.7 for a previously-decoded reference field or reference frame or complementary reference field pair or field of a reference frame. Rec. ITU-T H.264 (01/2012) Otherwise, if colour_plane_id is equal to 1, the reference picture sample array refPicLX corresponds to the decoded sample array SCb derived in clause 8.7 for a previously-decoded reference field or reference frame or complementary reference field pair or field of a reference frame. Otherwise (colour_plane_id is equal to 2), the reference picture sample array refPicLX corresponds to the decoded sample array Scr derived in clause 8.7 for a previously-decoded reference field or reference frame or complementary reference field pair or field of a reference frame. 8.4.2.2 Fractional sample interpolation process Inputs to this process are: the current partition given by its partition index mbPartIdx and its sub-macroblock partition index subMbPartIdx, the width and height partWidth, partHeight of this partition in luma-sample units, a luma motion vector mvLX given in quarter-luma-sample units, when ChromaArrayType is not equal to 0, a chroma motion vector mvCLX with a precision of one-(4*SubWidthC)-th chroma-sample units horizontally and one-(4*SubHeightC)-th chroma-sample units vertically, the selected reference picture sample arrays refPicLX, and when ChromaArrayType is not equal to 0, refPicLX and refPicLXcr Outputs