iir_filter        427 libavcodec/aacpsy.c                 v = iir_filter(la[i*128+j], pch->iir_state);
iir_filter        602 libavcodec/g723_1dec.c         iir_filter(filter_coef[0], filter_coef[1], buf + i, filter_signal + i, 1);
iir_filter        408 libavcodec/g723_1enc.c         iir_filter(flt_coef + 2 * l, flt_coef + 2 * l + LPC_ORDER,