ff_iir_filter_init_state  101 libavcodec/iirfilter.h struct FFIIRFilterState* ff_iir_filter_init_state(int order);
ff_iir_filter_init_state  130 libavcodec/psymodel.c                 ctx->fstate[i] = ff_iir_filter_init_state(FILT_ORDER);
ff_iir_filter_init_state   41 libavcodec/tests/iirfilter.c     fstate  = ff_iir_filter_init_state(FILT_ORDER);