The function QuantizeResidual4x4Fwd has a parameter called "roundmode". The documentation state that if set to 0 an interframe is processed and if set to 1 and intra frame is processed.
Is it possible to get an actual description of what is the actual effect on the quantizer?
Do you mean the description: The functions ippiQuantizeResidual4x4Fwd_H264_16s_C1, ippiQuantizeResidual4x4Fwd_H264_16s32s_C1, and ippiQuantizeResidual4x4Fwd_H264_32s_C1 are declared in the ippvc.h file. These functions perform forward quantization for a 4x4 residual block. A 4x4 residual block (pSrc) is quantized. All values are rounded towards nearest (intra frame, roundmode=1 ) or towards zero (inter frame, roundmode=0 ). Then the number of non-zero elements and index of the last non-zero element are calculated and stored. If pQuantTable is NULL, the default quantization table is used.
This function is used in the H.264 encoder included into Intel IPP Samples.