e[ mbAddr ]. Unless marked as unspecified, each element of subMbType is equal to one of the sub-macroblock types specified in Tables 7-17 and 7-18. All elements of the array subMbType are initially marked as unspecified. Rec. ITU-T H.264 (01/2012) A one-dimensional array mvCnt with PicSizeInMbs elements specifying the number of motion vectors for the macroblocks of a layer representation. An element of this array for a macroblock with address mbAddr is referred to as mvCnt[ mbAddr ]. All elements of the array mvCnt are initially set equal to 0. A one-dimensional array tQPy with PicSizeInMbs elements specifying luma quantisation parameters for the macroblocks of a layer representation. An element of this array for a macroblock with address mbAddr is referred to as tQPy[ mbAddr ]. All elements of the array tQPy are initially set equal to 0. When ChromaArrayType is not equal to 0, two one-dimensional arrays tQPCb and tQPcr with PicSizeInMbs elements specifying Cb and Cr quantisation parameters, respectively, for the macroblocks of a layer representation. An element of these arrays for a macroblock with address mbAddr is referred to as tQPcx[ mbAddr ] with CX being replaced by Cb or Cr. All elements of the arrays tQPcb and tQPc are initially set equal to 0. A (PicSizeInMbs)x16 array ipred4x4 specifying Intra 4x4 prediction modes for the macroblocks of a layer representation. An element of this array for a macroblock with address mbAddr and a 4x4 block with index c4x4BlkIdx is referred to as ipred4x4[ mbAddr ][ c4x4BlkIdx ]. A one-dimensional array specifying Intra 4 prediction modes for the 4x4 blocks of a macroblock with address mbAddr is referred to as ipred4x4[ mbAddr ]. All elements of the array ipred4x4 are initially marked as unspecified. A (PicSizeInMbs)x4 array ipred8x8 specifying Intra 8x8 prediction modes for the macroblocks of a layer representation. An element of this array for a macroblock with address mbAddr and a 8x8 block with index c8x8BlkIdx is referred to as ipred8x8[ mbAddr ][ c8x8BlkIdx ]. A one-