Commit 1e772aee authored by sekine's avatar sekine
Browse files

Added some more comments for explanations.

parent 8b75b675

lib_enc/ivas_stereo_dmx_evs.c

+5 −5
Original line number Diff line number Diff line
@@ -203,7 +203,7 @@ static void calc_poc( 
        cos_step = 4;

        cos_max = input_frame;

    }

    else // for 32 kHz & 48 kHz

    else /* for 32 kHz & 48 kHz */

    {

        cos_step = 2;

        cos_max = n0;
@@ -376,7 +376,7 @@ static float find_poc_peak( 
    itd_cand[0] = itd_cand[1] = 0;

    P = hPOC->P;



    for ( i = 1; i < hPOC->shift_limit; i++ )

    for ( i = 1; i < hPOC->shift_limit; i++ ) /*find peaks of POC P[] with positive and negative ITD */

    {

        if ( P[Lh - i] > Q[0] )

        {
@@ -411,7 +411,7 @@ static float find_poc_peak( 
        Q[n] = ( 1.0f - ( cQ[n] / ( peak_range * 2 + 1 ) + eps2 ) / ( Q[n] + eps2 ) );

        Q[n] = max( Q[n], 0.0f );



        if ( on[n] )

        if ( on[n] ) /*if channel n was active (likely to be preceding) in the previous frame*/

        {

            tmpf = ( 0.3f - 0.2f * (float) abs( itd_cand[n] ) / (float) hPOC->shift_limit ) * peakQ[n];

            if ( Q[n] < tmpf )
@@ -428,7 +428,7 @@ static float find_poc_peak( 


            peakQ[n] = max( peakQ[n], Q[n] );

        }

        else

        else /*if channel n was not active (not likely to be preceding) in the previous frame*/

        {

            tmpf = ( 0.75f - 0.2f * (float) abs( itd_cand[n] ) / (float) hPOC->shift_limit );
@@ -489,7 +489,7 @@ static float find_poc_peak( 
    }

#endif



    cconfidence = sqrtf( fabsf( Q[0] - Q[1] ) );

    cconfidence = sqrtf( fabsf( Q[0] - Q[1] ) ); /*higher value indicates higher confidence for one preceding channel*/



    return hPOC->confidence = hPOC->confidence * STEREO_DMX_EVS_CORR_FORGETTING + cconfidence * ( 1.0f - STEREO_DMX_EVS_CORR_FORGETTING );

}