FILTER_SHIFT      156 libavcodec/resample2.c                 filtered[j]= sum / (1<<FILTER_SHIFT);
FILTER_SHIFT      189 libavcodec/resample2.c     av_build_filter(c->filter_bank, factor, c->filter_length, phase_count, 1<<FILTER_SHIFT, WINDOW_TYPE);
FILTER_SHIFT      259 libavcodec/resample2.c         val = (val + (1<<(FILTER_SHIFT-1)))>>FILTER_SHIFT;