Commit 901841d9 authored by Sandesh Venkatesh's avatar Sandesh Venkatesh Committed by Manuel Jander
Browse files

Fix for 3GPP issue 1339: Artifact in IGF part for first active frame after DTX... 

Fix for 3GPP issue 1339: Artifact in IGF part for first active frame after DTX period in MDCT-Stereo

Link #1339
parent 85432c38

lib_enc/ivas_stereo_mdct_core_enc_fx.c

+26 −0
Original line number Diff line number Diff line
@@ -358,6 +358,32 @@ void stereo_mdct_core_enc_fx( 
        }

        q_spec = sub( Q31, q_spec );



        /*find headroom to increase precision*/

        Word16 hdrm_min = MAX_16;

        move16();

        FOR( ch = 0; ch < CPE_CHANNELS; ch++ )

        {

            IF( EQ_16( sts[ch]->hTcxEnc->tcxMode, TCX_20 ) )

            {

                length = sts[ch]->hTcxEnc->L_frameTCX;

                move16();

            }

            ELSE

            {

                length = shr( sts[ch]->hTcxEnc->L_frameTCX, 1 );

            }

            FOR( k = 0; k <= ( ( sts[ch]->core == TCX_20_CORE ) ? 1 : NB_DIV ) - 1; k++ )

            {

                hdrm_min = s_min( hdrm_min, L_norm_arr( sts[ch]->hTcxEnc->spectrum_fx[k], length ) );

                hdrm_min = s_min( hdrm_min, L_norm_arr( mdst_spectrum_fx[ch][k], length ) );

            }

        }



        IF( hdrm_min != 0 )

        {

            q_spec = sub( add( hdrm_min, q_spec ), 1 ); /*1 guard bit to avoid over-flows*/

        }



        FOR( ch = 0; ch < CPE_CHANNELS; ch++ )

        {

            Word16 n_sb = NB_DIV;