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OPUS_GET_IN_DTX handles Silk middle channel only

Signed-off-by: Felicia Lim <[email protected]>

--- a/src/opus_encoder.c

+++ b/src/opus_encoder.c

@@ -2736,11 +2736,11 @@

             }

             if (st->silk_mode.useDTX && (st->prev_mode == MODE_SILK_ONLY || st->prev_mode == MODE_HYBRID)) {

                 /* DTX determined by Silk. */

-                int n;

-                void *silk_enc = (char*)st+st->silk_enc_offset;

-                *value = 1;

-                for (n=0;n<st->silk_mode.nChannelsInternal;n++) {

-                    *value = *value && ((silk_encoder*)silk_enc)->state_Fxx[n].sCmn.noSpeechCounter >= NB_SPEECH_FRAMES_BEFORE_DTX;

+                silk_encoder *silk_enc = (silk_encoder*)((char*)st+st->silk_enc_offset);

+                *value = silk_enc->state_Fxx[0].sCmn.noSpeechCounter >= NB_SPEECH_FRAMES_BEFORE_DTX;

+                /* Stereo: check second channel unless only the middle channel was encoded. */

+                if(*value == 1 && st->silk_mode.nChannelsInternal == 2 && silk_enc->prev_decode_only_middle == 0) {

+                    *value = silk_enc->state_Fxx[1].sCmn.noSpeechCounter >= NB_SPEECH_FRAMES_BEFORE_DTX;

                 }

             }

 #ifndef DISABLE_FLOAT_API

@@ -2754,7 +2754,6 @@

             }

         }

         break;

-

         case CELT_GET_MODE_REQUEST:

         {

            const CELTMode ** value = va_arg(ap, const CELTMode**);