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Turn on CELT's PLC only if there are >=2 packets received consecutively.

Avoids generating comfort noise with unwanted tones in DTX mode.

--- a/celt/celt_decoder.c

+++ b/celt/celt_decoder.c

@@ -82,6 +82,7 @@

    int error;

    int last_pitch_index;

    int loss_count;

+   int skip_plc;

    int postfilter_period;

    int postfilter_period_old;

    opus_val16 postfilter_gain;

@@ -164,8 +165,6 @@

    st->signalling = 1;

    st->arch = opus_select_arch();

-   st->loss_count = 0;

-

    opus_custom_decoder_ctl(st, OPUS_RESET_STATE);

    return OPUS_OK;

@@ -447,7 +446,7 @@

    loss_count = st->loss_count;

    start = st->start;

-   noise_based = loss_count >= 5 || start != 0;

+   noise_based = loss_count >= 5 || start != 0 || st->skip_plc;

    if (noise_based)

    {

       /* Noise-based PLC/CNG */

@@ -832,6 +831,10 @@

       return frame_size/st->downsample;

    }

+   /* Check if there are at least two packets received consecutively before

+    * turning on the pitch-based PLC */

+   st->skip_plc = st->loss_count != 0;

+

    if (dec == NULL)

    {

       ec_dec_init(&_dec,(unsigned char*)data,len);

@@ -1198,6 +1201,7 @@

                ((char*)&st->DECODER_RESET_START - (char*)st));

          for (i=0;i<2*st->mode->nbEBands;i++)

             oldLogE[i]=oldLogE2[i]=-QCONST16(28.f,DB_SHIFT);

+         st->skip_plc = 1;

       }

       break;

       case OPUS_GET_PITCH_REQUEST: