H.264

This section describes functions for decoding of video data in accordance with JVT-G050 ([JVTG050]) and ITUH264 ([ITUH264]) standards.

The use of some functions described in this section is demonstrated in Intel® IPP Samples downloadable from http://www.intel.com/cd/software/products/asmo-na/eng/220046.htm .

The following enumeration is used to indicate prediction modes of the Intra_4x4 prediction process for luma samples (8.3.1 of JVT-G050):

typedef enum { IPP_4x4_VERT = 0, IPP_4x4_HOR = 1, IPP_4x4_DC = 2, IPP_4x4_DIAG_DL = 3, IPP_4x4_DIAG_DR = 4, IPP_4x4_VR = 5, IPP_4x4_HD = 6, IPP_4x4_VL = 7, IPP_4x4_HU = 8 } IppIntra4x4PredMode_H264;

The table below shows the correspondence between prediction modes and constants of enum IppIntra4x4PredMode_H264.


Name of Constant	Prediction Mode	Chapter in JVT-G050
IPP_4x4_VERT	Intra_4x4_Vertical	8.3.1.2.1
IPP_4x4_HOR	Intra_4x4_Horizontal	8.3.1.2.2
IPP_4x4_DC	Intra_4x4_DC	8.3.1.2.3
IPP_4x4_DIAG_DL	Intra_4x4_Diagonal_Down_Left	8.3.1.2.4
IPP_4x4_DIAG_DR	Intra_4x4_Diagonal_Down_Right	8.3.1.2.5
IPP_4x4_VR	Intra_4x4_Vertical_Right	8.3.1.2.6
IPP_4x4_HD	Intra_4x4_Horizontal_Down	8.3.1.2.7
IPP_4x4_VL	Intra_4x4_Vertical_Left	8.3.1.2.8
IPP_4x4_HU	Intra_4x4_Horizontal_Up	8.3.1.2.9

The following enumeration is used to indicate prediction modes of the Intra_16x16 prediction process for luma samples (8.3.2 of JVT-G050):

typedef enum { IPP_16X16_VERT = 0, IPP_16X16_HOR = 1, IPP_16X16_DC = 2, IPP_16X16_PLANE = 3, } IppIntra16x16PredMode_H264;

The table below shows the correspondence between prediction modes and constants of enum IppIntra16x16PredMode_H264.


Name of Constant	Prediction Mode	Chapter in JVT-G050
IPP_16X16_VERT	Intra_16x16_Vertical	8.3.2.1
IPP_16X16_HOR	Intra_16x16_Horizontal	8.3.2.2
IPP_16X16_DC	Intra_16x16_DC	8.3.2.3
IPP_16X16_PLANE	Intra_16x16_Plane	8.3.2.4

The following enumeration is used to indicate prediction modes of the intra prediction process for chroma samples (8.3.3 of JVT-G050):

typedef enum { IPP_CHROMA_DC = 0, IPP_CHROMA_HOR = 1, IPP_CHROMA_VERT = 2, IPP_CHROMA_PLANE = 3, } IppIntraChromaPredMode_H264;

The table below shows the correspondence between prediction modes and constants of enum IppIntraChromaPredMode_H264.


Name of Constant	Prediction Mode	Chapter in JVT-G050
IPP_CHROMA_DC	Intra_Chroma_DC	8.3.3.1
IPP_CHROMA_HOR	Intra_Chroma_Horizontal	8.3.3.2
IPP_CHROMA_VERT	Intra_Chroma_Vertical	8.3.3.3
IPP_CHROMA_PLANE	Intra_Chroma_Plane	8.3.3.4

The following enumeration is used to indicate availability of the corresponding positions for prediction in the picture:

typedef enum { IPP_UPPER = 1, IPP_LEFT = 2, IPP_CENTER = 4, IPP_RIGHT = 8, IPP_LOWER = 16, IPP_UPPER_LEFT = 32, IPP_UPPER_RIGHT = 64, IPP_LOWER_LEFT = 128, IPP_LOWER_RIGHT = 256, } IppLayoutFlag;

The following enumeration is used to indicate image type of the picture:

typedef enum _IPPVC_FRAME_FIELD_FLAG { IPPVC_FRAME = 0x0, IPPVC_TOP_FIELD = 0X1, IPPVC_BOTTOM_FIELD = 0x2 } IPPVC_FRAME_FIELD_FLAG;

H.264 Video Decoder Functions
Function Short Name	Description
CAVLC Parsing
DecodeCAVLCCoeffs_H264	Decodes any non-chroma DC coefficients CAVLC coded.
DecodeCAVLCChromaDcCoeffs_H264, DecodeCAVLCChroma422DcCoeffs_H264	Decode chroma DC coefficients CAVLC coded.
DecodeExpGolombOne_H264	Decodes one Exp-Golomb code accordance to 9.1 H.264 standard.
Inverse Quantization and Inverse Transform
TransformDequantLumaDC_H264	Performs integer inverse transformation and dequantization for 4x4 luma DC coefficients.
TransformDequantChromaDC_H264	Performs integer inverse transformation and dequantization for 2x2 chroma DC coefficients.
TransformResidual4x4Inv_H264	Performs integer inverse transformation for a 4x4 block of residuals.
DequantTransformResidual_H264	Performs dequantization, integer inverse transformation, and shift for a 4x4 block of residuals.
DequantTransformResidualAndAdd_H264	Performs dequantization, integer inverse transformation, shift for a 4x4 block of residuals with subsequent intra prediction or motion compensation.
TransformPrediction_H264	Performs inverse transform of inter prediction samples for the current macroblock in decoding process for P macroblocks in SP slices or SI macroblocks.
DequantTransformResidual_SISP_H264	Performs integer inverse transformation and dequantization of one block in P macroblocks in SP slices or SI macroblocks.
TransformDequantChromaDC_SISP_H264	Performs integer inverse transformation and dequantization for 2x2 chroma DC coefficients in P macroblocks in SP slices or SI macroblocks.
Intra Prediction
PredictIntra_4x4_H264	Performs luma component prediction for intra 4x4 macroblock type.
PredictIntra_16x16_H264	Performs luma component prediction for intra 16x16 macroblock type.
PredictIntraChroma8x8_H264	Performs chroma component prediction for intra macroblock type.
Inter Prediction
ExpandPlane_H264	Expands the plane.
InterpolateLuma_H264	Performs interpolation for motion estimation of the luma component using fractional part of motion vector.
InterpolateLumaTop_H264	Performs interpolation for motion estimation of the luma component at the frame top boundary.
InterpolateLumaBottom_H264	Performs interpolation for motion estimation of the luma component at the frame bottom boundary.
InterpolateLumaBlock_H264	Performs interpolation for motion estimation of the luma component using entire motion vector.
InterpolateChroma_H264	Performs interpolation for motion estimation of the chroma component using fractional part of motion vector.
InterpolateChromaTop_H264	Performs interpolation for motion estimation of the chroma component at the frame top boundary.
InterpolateChromaBottom_H264	Performs interpolation for motion estimation of the chroma component at the frame bottom boundary.
InterpolateChromaBlock_H264	Performs interpolation for motion estimation of the chroma component using entire motion vector.
InterpolateBlock_H264, Bidir_H264	Calculate the average value for each source pair values in block.
WeightedAverage_H264	Averages two blocks with weights.
UniDirWeightBlock_H264, UnidirWeight_H264	Weigh source block.
BiDirWeightBlock_H264, BidirWeight_H264	Average two blocks with two weights and two offsets.
BiDirWeightBlockImplicit_H264, BidirWeightImplicit_H264	Average two blocks with weights if ulog2wd is equal to 5.
Macroblock Reconstruction
ReconstructChromaInterMB_H264	Reconstructs inter chroma macroblock.
ReconstructChromaIntraHalvesMB_H264	Reconstructs two halves of intra chroma macroblock.
ReconstructChromaIntraMB_H264	Reconstructs intra chroma macroblock.
ReconstructChromaInter4x4MB_H264, ReconstructChromaInter4x4_H264High	Reconstruct 4X4 inter chroma macroblock for high profile.
ReconstructChroma422Inter4x4_H264High	Reconstructs 4X4 inter chroma macroblock for 4:2:2 chroma mode.
ReconstructChromaIntraHalves4x4MB_H264, ReconstructChromaIntraHalf4x4_H264High	Reconstruct two independent halves of 4X4 intra chroma macroblock for high profile.
ReconstructChromaIntra4x4MB_H264, ReconstructChromaIntra4x4_H264High	Reconstruct 4X4 intra chroma macroblock for high profile.
ReconstructChroma422IntraHalf4x4_H264High	Reconstructs two independent halves of 4X4 intra chroma macroblock for 4:2:2 chroma mode.
ReconstructChroma422Intra4x4_H264High	Reconstructs 4X4 intra chroma macroblock for 4:2:2 chroma mode.
ReconstructLumaInterMB_H264	Reconstructs inter luma macroblock.
ReconstructLumaIntraHalfMB_H264	Reconstructs half of intra luma macroblock.
ReconstructLumaIntraMB_H264	Reconstructs intra luma macroblock.
ReconstructLumaInter4x4MB_H264, ReconstructLumaInter4x4_H264High	Reconstruct 4X4 inter luma macroblock for high profile.
ReconstructLumaIntraHalf4x4MB_H264, ReconstructLumaIntraHalf4x4_H264High	Reconstruct half of 4X4 intra luma macroblock for high profile.
ReconstructLumaIntra4x4MB_H264, ReconstructLumaIntra4x4_H264High	Reconstruct 4X4 intra luma macroblock for high profile.
ReconstructLumaInter8x8MB_H264, ReconstructLumaInter8x8_H264High	Reconstruct 8X8 inter luma macroblock for high profile.
ReconstructLumaIntraHalf8x8MB_H264, ReconstructLumaIntraHalf8x8_H264High	Reconstruct half of 8X8 intra luma macroblock for high profile.
ReconstructLumaIntra8x8MB_H264, ReconstructLumaIntra8x8_H264High	Reconstruct 8X8 intra luma macroblock for high profile.
ReconstructLumaIntra16x16MB_H264	Reconstructs intra 16X16 luma macroblock.
ReconstructLumaIntra_16x16MB_H264, ReconstructLumaIntra16x16_H264High	Reconstruct intra 16X16 luma macroblock for high profile.
Deblocking Filtering
FilterDeblockingLuma_VerEdge_H264	Performs deblocking filtering on the vertical edges of a luma 16x16 macroblock.
FilterDeblockingLuma_VerEdge_MBAFF_H264	Performs deblocking filtering on the external vertical edges of half of a 16x16 luma macroblock.
FilterDeblockingLuma_HorEdge_H264	Performs deblocking filtering on the horizontal edges of a luma 16x16 macroblock.
FilterDeblockingChroma_VerEdge_H264, FilterDeblockingChromaVerEdge_H264, FilterDeblockingChroma422VerEdge_H264	Perform deblocking filtering on the vertical edges of a chroma macroblock.
FilterDeblockingChroma_VerEdge_MBAFF_H264, FilterDeblockingChroma422VerEdgeMBAFF_H264	Perform deblocking filtering on the external vertical edges of half of an 8x8 chroma macroblock.
FilterDeblockingChroma_HorEdge_H264, FilterDeblockingChromaHorEdge_H264, FilterDeblockingChroma422HorEdge_H264	Perform deblocking filtering on the horizontal edges of a chroma macroblock.

H.264 Video Encoder Functions
Function Short Name	Description
Edges Detection
EdgesDetect16x16	Detects edges inside a 16X16 block.
Calculation of Inter Predicted Blocks
InterpolateLuma_H264	Performs interpolation for motion estimation of the luma component.
InterpolateLumaTop_H264	Performs interpolation for motion estimation of the luma component at the frame top boundary.
InterpolateLumaBottom_H264	Performs interpolation for motion estimation of the luma component at the frame bottom boundary.
InterpolateChroma_H264	Performs interpolation for motion estimation of the chroma component.
InterpolateChromaTop_H264	Performs interpolation for motion estimation of the chroma component at the frame top boundary.
InterpolateChromaBottom_H264	Performs interpolation for motion estimation of the chroma component at the frame bottom boundary.
Calculation of Intra Predicted Blocks
PredictIntra_4x4_H264	Performs intra prediction for a 4x4 luma component.
PredictIntra_16x16_H264	Performs intra prediction for a 16x16 luma component.
PredictIntraChroma8x8_H264	Performs intra prediction for a 8x8 chroma component.
Estimation of Inter and Intra Predicted Blocks
SAD16x16	Evaluates sum of absolute difference between current and reference 16X16 blocks.
SAD16x8	Evaluates sum of absolute difference between current and reference 16X8 blocks.
SAD8x16	Evaluates sum of absolute difference between current and reference 8X16 blocks.
SAD8x8	Evaluates sum of absolute difference between current and reference 8X8 blocks.
SAD8x4	Evaluates sum of absolute difference between current and reference 8X4 blocks.
SAD4x8	Evaluates sum of absolute difference between current and reference 4X8 blocks.
SAD4x4	Evaluates sum of absolute difference between current and reference 4X4 blocks.
SAD16x16Blocks8x8	Evaluates four partial sums of absolute differences between current and reference 16X16 blocks.
SAD16x16Blocks4x4	Evaluates 16 partial sums of absolute differences between current and reference 16X16 blocks.
SATD16x16	Evaluates sum of absolute transformed differences between current and reference 16X16 blocks using 4x4 transform.
SATD16x8	Evaluates sum of absolute transformed differences between current and reference 16X8 blocks using 4x4 transform.
SATD8x16	Evaluates sum of absolute transformed differences between current and reference 8X16 blocks using 4x4 transform.
SATD8x8	Evaluates sum of absolute transformed differences between current and reference 8X8 blocks using 4x4 transform.
SATD8x4	Evaluates sum of absolute transformed differences between current and reference 8X4 blocks using 4x4 transform.
SATD4x8	Evaluates sum of absolute transformed differences between current and reference 4X8 blocks using 4x4 transform.
SATD4x4	Evaluates sum of absolute transformed differences between current and reference 4X4 blocks using 4x4 transform.
SAT8x8D	Evaluates sum of absolute transformed differences between current and reference 8X8 blocks using 8x8 transform.
Obtaining Residual and DC Blocks
GetDiff4x4	Calculates a residual 4x4 block in the cases of intra 4x4 luma block or inter luma block.
SumsDiff16x16Blocks4x4	Calculates a 4x4 DC luma block and 4x4 residual blocks in the case of an intra 16x16 luma block.
SumsDiff8x8Blocks4x4	Calculates a 2x2 DC chroma block and residual 4x4 chroma blocks.
Forward Transform and Quantization
TransformQuantChromaDC_H264	Performs forward transform and quantization for 2x2 DC chroma blocks.
TransformQuantLumaDC_H264	Performs forward transform and quantization for 4x4 DC luma blocks.
TransformResidual4x4Fwd_H264	Performs forward transform for 4X4 residual blocks.
QuantizeResidual4x4Fwd_H264	Performs forward quantization for 4X4 residual blocks.
TransformQuantResidual_H264	Performs forward transform and quantization for 4x4 residual blocks.
TransformLuma8x8Fwd_H264	Performs forward 8x8 transform for 8x8 luma blocks without normalization.
QuantLuma8x8_H264	Performs quantization for 8x8 luma block coefficients including 8x8 transform normalization.
GenScaleLevel8x8_H264	Generates ScaleLevel matrices for forward and inverse quantization including normalization for 8x8 forward and inverse transform.
CAVLC Functions
EncodeCoeffsCAVLC_H264	Calculates characteristics of 4X4 block for CAVLC encoding.
EncodeChromaDcCoeffsCAVLC_H264	Calculates characteristics of 2X2 chroma DC block for CAVLC encoding.
CABAC Functions
CABACGetSize_H264	Returns the size required for the CABAC state.
CABACGetContexts_H264	Copies contexts from the CABAC state structure.
CABACInit_H264	Initializes CABAC state and alignes bitstream to byte boundary by writing 1s.
CABACInitAlloc_H264	Allocates and initializes CABAC state and alignes bitstream to byte boundary by writing 1s.
CABACFree_H264	Releases CABAC state, allocated by ippiCABACInitAlloc_H264.
CABACSetStream_H264	Sets a new pointer for output stream.
CABACGetStreamSize_H264	Returns the number of bits in the bitstream.
CABACEncodeBin_H264	Encodes one bin with CABAC and writes it to the stream.
CABACEncodeBinBypass_H264	Encodes bin with CABAC using bypass encoding process and writes it to the stream.
CABACTerminateSlice_H264	Encodes bin with CABAC using bypass encoding process and writes it to the stream.
CABACEncodeResidualBlock_H264	Encodes bin with CABAC using bypass encoding process and writes it to the stream.
Inverse Quantization and Transform
TransformDequantLumaDC_H264	Performs integer inverse transformation and dequantization for 4x4 luma DC coefficients.
TransformDequantChromaDC_H264	Performs integer inverse transformation and dequantization for 2x2 chroma DC coefficients.
DequantTransformResidualAndAdd_H264	Performs dequantization, integer inverse transformation, shift for a 4x4 block of residuals with subsequent intra prediction or motion compensation.
QuantLuma8x8Inv_H264	Performs inverse quantization for 8x8 luma block coefficients including normalization of the following inverse 8x8 transform.
TransformLuma8x8InvAddPred_H264	Performs inverse 8x8 transform of 8x8 luma block coefficients with subsequent intra prediction or motion compensation.
Deblocking
FilterDeblockingLuma_VerEdge_H264	Performs deblocking filtering on the vertical edges of the luma 16x16 macroblock.
FilterDeblockingLuma_VerEdge_MBAFF_H264	Performs deblocking filtering on the vertical edges of half of the luma 16x16 macroblock.
FilterDeblockingLuma_HorEdge_H264	Performs deblocking filtering on the horizontal edges of the luma 16x16 macroblock.
FilterDeblockingChroma_VerEdge_H264, FilterDeblockingChroma422VerEdge_H264	Performs deblocking filtering on the vertical edges of the chroma 8x8 macroblock.
FilterDeblockingChroma_VerEdge_MBAFF_H264, FilterDeblockingChroma422VerEdgeMBAFF_H264	Performs deblocking filtering on the vertical edges of half of the chroma 8x8 macroblock.
FilterDeblockingChroma_HorEdge_H264, FilterDeblockingChroma422HorEdge_H264	Performs deblocking filtering on the horizontal edges of the chroma 8x8 macroblock.