Commit d917860b authored by Sandesh Venkatesh's avatar Sandesh Venkatesh
Browse files

Updates for Q-handling in stereo cng dec to address 3GPP issue 732

parent 1d09e987

lib_dec/ivas_stereo_cng_dec.c

+6 −2
Original line number Diff line number Diff line
@@ -1319,13 +1319,17 @@ static void stereo_dft_generate_comfort_noise_fx( 
                {

                    /* Real part in FFT bins */

                    rand_gauss_fx( ptr_r, &st->hTdCngDec->cng_seed, q_dft );

                    tmp = Mpy_32_16_1( Sqrt32( *ptr_level, &q_sqrt ), scale );

                    ( *ptr_r ) = Mpy_32_32( *ptr_r, tmp );

                    q_sqrt = sub( Q31, q_cngNoiseLevel );

                    tmp = Sqrt32( *ptr_level, &q_sqrt );

                    tmp = Mpy_32_16_1( tmp, scale );       // 15 + q_sqrt

                    ( *ptr_r ) = Mpy_32_32( *ptr_r, tmp ); // q_dft + 15 + q_sqrt - 31

                    ( *ptr_r ) = L_shl_sat( ( *ptr_r ), add( 15, q_sqrt ) );

                    move32();

                    ptr_r += 2;

                    /* Imaginary part in FFT bins */

                    rand_gauss_fx( ptr_i, &st->hTdCngDec->cng_seed, q_dft );

                    ( *ptr_i ) = Mpy_32_32( *ptr_i, tmp );

                    ( *ptr_i ) = L_shl_sat( ( *ptr_i ), add( 15, q_sqrt ) );

                    move32();

                    ptr_i += 2;

                }