ReconstructChroma422IntraHalf4x4

Reconstructs two independent halves of 4X4 intra chroma macroblock for 4:2:2 chroma mode.

Syntax

IppStatus ippiReconstructChroma422IntraHalf4x4_H264High_32s16u_IP2R(const IppiReconstructHighMB_32s16u* pReconstructInfo[2], IppIntraChromaPredMode_H264 intraChromaMode, Ipp32u edgeTypeTop, Ipp32u edgeTypeBottom, Ipp32u levelScaleDCU, Ipp32u levelScaleDCV);

IppStatus ippiReconstructChroma422IntraHalf4x4_H264High_16s8u_IP2R(const IppiReconstructHighMB_16s8u* pReconstructInfo[2], IppIntraChromaPredMode_H264 intraChromaMode, Ipp32u edgeTypeTop, Ipp32u edgeTypeBottom, Ipp32u levelScaleDCU, Ipp32u levelScaleDCV);

Parameters

ppSrcDstCoeff	Pointer to the order of 4x4 blocks of residual coefficients for this macroblock, which are taken as a result of Huffman decoding (2x2 DC U-block, 2x2 DC V-block, 4x4 AC U-blocks, 4x4 AC V-blocks if the block is not zero-filled) in the same order as is shown in Figure 8‑7(b) of [ITUH264]. Pointer is updated by the function and points to the blocks for the next macroblock.
pSrcDstUPlane	Pointer to the current U plane that is reconstructed.
pSrcDstVPlane	Pointer to the current V plane that is reconstructed.
srcDstUVStep	Plane step.
intraChromaMode	Prediction mode of the Intra_chroma prediction process for chroma samples. This mode is defined in the same way as in PredictIntraChroma8x8_H264 function.
cbp4x4	Coded block pattern. If cbp4x4 & (1<<(IPPVC_CBP_1ST_CHROMA_DC_BITPOS) is not equal to 0, 2x2 DC U-block is not zero-filled and exists in ppSrcDstCoeff. If cbp4x4 & (1<<(IPPVC_CBP_1ST_CHROMA_DC_BITPOS+ 1)) is not equal to 0, 2x2 DC U-block is not zero-filled and exists in ppSrcDstCoeff. If cbp4x4 & (1<<(IPPVC_CBP_1ST_CHROMA_AC_BITPOS+ i)) is not equal to 0, (0 ≤ i < 8), i-th 4x4 AC U-block is not zero-filled and exists in ppSrcDstCoeff. If cbp4x4 & (1<<(IPPVC_CBP_1ST_CHROMA_AC_BITPOS+ i+4)) is not equal to 0, (0 ≤ i < 8), i-th 4x4 AC U-block is not zero-filled and exists in ppSrcDstCoeff.
ChromaQPU	Chroma quantizer for U plane (QP_C in [ITUH264]). It must be within the range [0;39].
ChromaQPV	Chroma quantizer for V plane (QP_C in [ITUH264]). It must be within the range [0;39].
levelScaleDCU	Chroma quantizer for U plane (LevelScale(QP_C,DC%6, 0, 0)) in [ITUH264]) for chroma DC coefficients.
levelScaleDCV	Chroma quantizer for V plane (LevelScale(QP_C,DC%6, 0, 0)) in [ITUH264]) for chroma DC coefficients.
edgeTypeTop, edgeTypeBottom	Flags that specify the availability of the macroblocks used for prediction. Upper and lower halves of the macroblock may have different prediction vectors, so use two flags: one for the upper half of the macroblock, the other - for the lower half.
pQuantTableU	Pointer to the quantization table for U plane (LevelScale(qP%6, i, j) in [ITUH264]).
pQuantTableV	Pointer to the quantization table for V plane (LevelScale(qP%6, i, j) in [ITUH264]).
bypassFlag	Flag enabling lossless coding.
pReconstructInfo[2]	Pointer to the IppiReconstructHighMB_32s16u and IppiReconstructHighMB_16s8u structures. The first pointer pReconstructInfo[0] points to the structure with parameters for restructuring chroma macroblock of plane U, and the second pointer pReconstructInfo[1] points to the structure with parameters for restructuring Chroms macroblock of plane V.

Description

The functions ippiReconstructChroma422IntraHalf4x4_H264High_32s16u_IP2R and ippiReconstructChroma422IntraHalf4x4_H264High_16s8u_IP2R are declared in the ippvc.h file. These functions reconstruct 4x4 intra chroma macroblocks (16x8 U macroblock and 16x8 V macroblock) divided into upper and lower 8x8 halves for chroma format 4:2:2 (chroma_format_idc is equal to 2). The halves differ only in prediction, that is, have independent prediction vectors. Otherwise their performance is the same:

Perform integer inverse transformation and dequantization for 2x2 U DC coefficients and for 2x2 V DC coefficients in accordance with 8.5.7 of [ITUH264] in the same way as TransformDequantChromaDC_H264 function does.
Perform scaling, integer inverse transformation, and shift for 4x4 AC U-blocks and shift for 4x4 AC V-blocks in accordance with 8.5.8 of [ITUH264] in the same way as DequantTransformResidual_H264 function does. This process is performed on all 4x4 chroma blocks in the same order as is shown in Figure 8-7(b) of [ITUH264].
Perform adding of 16x8 intra prediction blocks and 16x8 residual blocks in accordance with 8-306 of [ITUH264].

These functions are used in the H.264 decoder included into Intel IPP Samples. See introduction to H.264.

Return Values

ippStsNoErr	Indicates no error.
ippStsNullPtrErr	Indicates an error condition if at least one of the specified pointers is NULL.
ippStsOutOfRangeErr	ChromaQPU or ChromaQPV is less than 0 or greater than 39.