Commit 291b4903 authored by Nicolas Roussin's avatar Nicolas Roussin
Browse files

Add headroom to state.

parent 106c5657

lib_com/ivas_filters_fx.c

+5 −4
Original line number Diff line number Diff line
@@ -309,20 +309,21 @@ static void ivas_iir_2_filter_fx64( 
        in = pIn_Out_fx[i];

        move32();



        shift = sub( filter_state->num_q[stage][0], 31 ); // (q + numq - 31) - q

        shift = sub( filter_state->num_q[stage][0], 30 );

        tmp_prod = W_shr( Mpy_64_32( in, filter_state->num_fx[stage][0] ), shift );



        pIn_Out_fx[i] = out = W_add( filter_state->state64_fx[stage][0], tmp_prod );

        out = W_add( filter_state->state64_fx[stage][0], tmp_prod );

        pIn_Out_fx[i] = W_shl( out, 1 );

        move32();



        FOR( j = 1; j < filter_state->filt_len; j++ )

        {

            shift = sub( filter_state->num_q[stage][j], 31 );

            shift = sub( filter_state->num_q[stage][j], 30 );

            tmp_prod = W_shr( Mpy_64_32( in, filter_state->num_fx[stage][j] ), shift );



            tmp = W_add( filter_state->state64_fx[stage][j], tmp_prod );



            shift = sub( filter_state->den_q[stage][j], 31 );

            shift = sub( filter_state->den_q[stage][j], 30 );

            tmp_prod = W_shr( Mpy_64_32( out, filter_state->den_fx[stage][j] ), shift );



            filter_state->state64_fx[stage][j - 1] = W_sub( tmp, tmp_prod );