odd = qscale & 0x1;
even = (qscale & 1)^1;
static void dct_unquantize_h261_inter_c(MpegEncContext *s,                                   DCTELEM *block, int n, int qscale){    int i, level, odd;    int nCoeffs;        assert(s->block_last_index[n]>=0);        odd = qscale & 0x1;        nCoeffs= s->inter_scantable.raster_end[ s->block_last_index[n] ];    for(i=0; i<=nCoeffs; i++){        level = block[i];        if (level){            if (level < 0){                level = qscale * ((level << 1) - 1) + (~odd);            }else{                level = qscale * ((level << 1) + 1) - (~odd);            }        }        block[i] = level;    }}