Commit b3c03a1f authored by Sandesh Venkatesh's avatar Sandesh Venkatesh
Browse files

EVS bit exactness fix

parent 2e84f3f4

lib_com/swb_tbe_com_fx.c

+28 −17
Original line number Diff line number Diff line
@@ -6935,10 +6935,7 @@ void synthesise_fb_high_band_fx( 
    Word32 temp1;

    Word32 ratio2;

    Word32 L_tmp;

    Word16 tmp3, tmp1, tmp2, exp, exp2, exp_tmp, sft, t_Q /* to store temporary Q for computations */;

    Word64 P_ONE = 33; /* 0.001f in Q15 */

    move64();

    Word64 W_temp;

    Word16 tmp3, tmp1, tmp2, exp, exp2, exp_tmp;



    /* Interpolate the white energy shaped gaussian excitation from 16 kHz to 48 kHz with zeros */

    j = 0;
@@ -6988,6 +6985,19 @@ void synthesise_fb_high_band_fx( 
    /* temp1 = sum2_f( tmp, L_FRAME48k ) + 0.001f */

    temp1 = sum2_fx_mod( tmp, L_FRAME48k );



    L_tmp = L_max( 1, fb_exc_energy ); /*Q(2*Q_fb_exc + 1)*/

    exp = norm_l( L_tmp );

    tmp3 = extract_h( L_shl( L_tmp, exp ) );

    tmp1 = sub( add( Q_fb_exc, Q_fb_exc ), 8 ); /* 1-9*/

    exp = sub( sub( 31, tmp1 ), exp );



    IF( element_mode != EVS_MONO )

    {

        Word16 sft, t_Q;

        Word64 P_ONE = 33; /* 0.001f in Q15 */

        move64();

        Word64 W_temp;



        t_Q = sub( shl( exp_tmp, 1 ), 8 );

        P_ONE = W_shl( P_ONE, sub( t_Q, 15 ) );
@@ -6999,14 +7009,15 @@ void synthesise_fb_high_band_fx( 
        temp1 = W_extract_h( W_temp );

        t_Q = sub( add( t_Q, sft ), 32 );



    L_tmp = L_max( 1, fb_exc_energy ); /*Q(2*Q_fb_exc + 1)*/

    exp = norm_l( L_tmp );

    tmp3 = extract_h( L_shl( L_tmp, exp ) );

    tmp1 = sub( add( Q_fb_exc, Q_fb_exc ), 8 ); /* 1-9*/

    exp = sub( sub( 31, tmp1 ), exp );



        tmp2 = extract_h( temp1 );

        exp2 = sub( 31, t_Q );

    }

    ELSE

    {

        exp2 = norm_l( temp1 );

        tmp2 = extract_h( L_shl( temp1, exp2 ) );

        exp2 = sub( sub( 31, sub( shl( exp_tmp, 1 ), 8 ) ), exp2 ); /* in Q15 (temp1 in Q9)*/

    }



    exp = sub( exp2, exp ); /* Denormalize and substract */

    IF( GT_16( tmp2, tmp3 ) )