H.263

This section contains functions for encoding and decoding of video data according to ITU-T Recommendation H.263 ([ITUH263]) and Annexes, which is most often denoted by the “H263 + decoder” acronym.

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 .

H.263 Video Decoder Functions
Function Short Name	Description
VLC Decoding
DecodeDCIntra_H263	Decodes DC coefficient for intra coded block.
DecodeCoeffsIntra_H263	Decodes AC coefficients for intra coded block.
DecodeCoeffsInter_H263	Decodes DCT coefficients for inter coded block.
Quantization
QuantInvIntra_H263	Performs inverse quantization on an intra coded block stored in a one-dimensional buffer.
QuantInvInter_H263	Performs inverse quantization on an inter coded block stored in a one-dimensional buffer.
Prediction
AddBackPredPB_H263	Performs bidirectional prediction for a B-block in a PB-frame.
Resampling
Resample_H263	Performs picture resampling defined in terms of picture area corner displacements.
UpsampleFour_H263	Performs factor-of-4 picture upsampling.
DownsampleFour_H263	Performs factor-of-4 picture downsampling.
UpsampleFour8x8_H263	Performs factor-of-4 upsampling on an 8x8 block.
SpatialInterpolation_H263	Interpolates a picture by a factor of two horizontally, vertically, or both horizontally and vertically.
Boundary Filtering
FilterBlockBoundaryHorEdge_H263, FilterBlockBoundaryVerEdge_H263	Perform block boundary filtering on a horizontal or vertical boundary of two adjacent 16x16 blocks.
FilterDeblocking8x8HorEdge_H263, FilterDeblocking8x8VerEdge_H263	Perform deblocking filtering of one block edge on the reconstructed frames.
FilterDeblocking16x16HorEdge_H263, FilterDeblocking16x16VerEdge_H263	Perform deblocking filtering on a horizontal or vertical boundary of two adjacent 16x16 blocks.
Middle Level Functions
ReconstructCoeffsIntra_H263	Reconstructs DCT coefficients for an intra coded block.
ReconstructCoeffsInter_H263	Reconstructs DCT coefficients for an inter coded block.

H.263 Video Encoder Functions
Function Short Name	Description
VLC Encoding
EncodeDCIntra_H263	Encodes and puts a quantized DC coefficient for an intra coded block into bitstream.
EncodeCoeffsIntra_H263	Encodes and puts quantized DCT coefficients for an intra coded block into bitstream.
EncodeCoeffsInter_H263	Encodes and puts quantized DCT coefficients for inter coded block into bitstream.
Quantization
QuantIntra_H263	Performs quantization on an intra coded block.
QuantInter_H263	Performs quantization on an inter coded block.
Resampling
DownsampleFour16x16_H263	Performs factor-of-4 downsampling on a 16x16 block.