resampling using ippsResamplePolyphaseFixed_16s

Hi 

i am new Intel ipp, when i go through old code some one in my company did i got doubts on resampling

            bufsize[k] = 200;
            history[k] = 20;
            time1[k] = 20;
            lastread[k] = 2*20;
            inRate[k] = 8000;
            outRate[k] = 16000;
              

        if(1)
        {
            ippsResamplePolyphaseFixedGetSize_16s(inRate[k],outRate[k],
                        2*(history[k]-1),&size[k],&len[k],&height[k],ippAlgHintAccurate);
            state[k]=(IppsResamlingPolyphaseFixed_16s*)ippsMalloc_8u(size[k]);
            ippsResamplePolyphaseFixedInit_16s(inRate[k],outRate[k],
                            2*(history[k]-1),0.95f,9.0f,state[k],ippAlgHintAccurate);
            inBuf[k]=ippsMalloc_16s(bufsize[k]+history[k]+2);
            outBuf[k]=ippsMalloc_16s((int)((bufsize[k]-history[k])*outRate[k]/(float)inRate[k]+2));
            ippsZero_16s(inBuf[k],lastread[k]);
            printf("\n bufsize %d history %d time %f lastread %d \n",
                    bufsize[k],history[k],time1[k], lastread[k]);
        }

on what basis bufsize, history, time1 and lastread values are taken, where in document 8.1 document values are like this int bufsize=4096;
int history=128;
double time=history;
int lastread=history;

please help about this and little information about ippsResamplePolyphaseFixed_16s and ippsMove_16s(inBuf+(int)time-history,inBuf,lastread+history-(int)time) what actually  ippsMove_16s doing  from 8.1 document

Thanks