ReconstructChroma422Inter4x4

Reconstructs 4X4 inter chroma macroblock for 4:2:2 chroma mode.

Syntax

IppStatus ippiReconstructChroma422Inter4x4_H264High_32s16u_IP2R(const IppiReconstructHighMB_32s16u* pReconstructInfo[2], Ipp32u levelScaleDCU, Ipp32u levelScaleDCV);

IppStatus ippiReconstructChroma422Inter4x4_H264High_16s8u_IP2R(const IppiReconstructHighMB_16s8u* pReconstructInfo[2], 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 macroblock that is reconstructed in current U plane. This macroblock must contain inter prediction samples.
pSrcDstVPlane	Pointer to macroblock that is reconstructed in current V plane. This macroblock must contain inter prediction samples.
srcDstUVStep	Plane step.
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 < 4), 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 < 4), 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.
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 ippiReconstructChroma422Inter4x4_H264High_32s16u_IP2R and ippiReconstructChroma422Inter4x4_H264High_16s8u_IP2R are declared in the ippvc.h file. These functions reconstruct eight 4x4 inter chroma macroblocks (16x8 U macroblock and 16x8 V macroblock) for chroma format 4:2:2 (chroma_format_idc is equal to 2):

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].
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]. 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 inter 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.