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Implements OPUS_RESET_STATE for multi-stream encoder

--- a/src/opus_multistream_encoder.c

+++ b/src/opus_multistream_encoder.c

@@ -1131,6 +1131,29 @@

        *value = st->variable_duration;

    }

    break;

+   case OPUS_RESET_STATE:

+   {

+      int s;

+      st->subframe_mem[0] = st->subframe_mem[1] = st->subframe_mem[2] = 0;

+      if (st->surround)

+      {

+         OPUS_CLEAR(ms_get_preemph_mem(st), st->layout.nb_channels);

+         OPUS_CLEAR(ms_get_window_mem(st), st->layout.nb_channels*120);

+      }

+      for (s=0;s<st->layout.nb_streams;s++)

+      {

+         OpusEncoder *enc;

+         enc = (OpusEncoder*)ptr;

+         if (s < st->layout.nb_coupled_streams)

+            ptr += align(coupled_size);

+         else

+            ptr += align(mono_size);

+         ret = opus_encoder_ctl(enc, OPUS_RESET_STATE);

+         if (ret != OPUS_OK)

+            break;

+      }

+   }

+   break;

    default:

       ret = OPUS_UNIMPLEMENTED;

       break;