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Silk CNG adapts faster to received packets with lower gains

--- a/silk/CNG.c

+++ b/silk/CNG.c

@@ -118,6 +118,10 @@

         /* Smooth gains */

         for( i = 0; i < psDec->nb_subfr; i++ ) {

             psCNG->CNG_smth_Gain_Q16 += silk_SMULWB( psDecCtrl->Gains_Q16[ i ] - psCNG->CNG_smth_Gain_Q16, CNG_GAIN_SMTH_Q16 );

+            /* If the smoothed gain is 3 dB greater than this subframe's gain, use this subframe's gain to adapt faster. */

+            if( silk_SMULWW( psCNG->CNG_smth_Gain_Q16, CNG_GAIN_SMTH_THRESHOLD_Q16 ) > psDecCtrl->Gains_Q16[ i ] ) {

+                psCNG->CNG_smth_Gain_Q16 = psDecCtrl->Gains_Q16[ i ];

+            }

         }

     }

--- a/silk/define.h

+++ b/silk/define.h

@@ -225,6 +225,7 @@

 /* Defines for CN generation */

 #define CNG_BUF_MASK_MAX                        255     /* 2^floor(log2(MAX_FRAME_LENGTH))-1    */

 #define CNG_GAIN_SMTH_Q16                       4634    /* 0.25^(1/4)                           */

+#define CNG_GAIN_SMTH_THRESHOLD_Q16             46396   /* -3 dB                                */

 #define CNG_NLSF_SMTH_Q16                       16348   /* 0.25                                 */

 #ifdef __cplusplus