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Making sure DTX for voice still works at high bit-rate

--- a/src/opus_encoder.c

+++ b/src/opus_encoder.c

@@ -580,7 +580,11 @@

        st->mode = (equiv_rate >= threshold) ? MODE_CELT_ONLY: MODE_SILK_ONLY;

+       /* When FEC is enabled and there's enough packet loss, use SILK */

        if (st->silk_mode.useInBandFEC && st->silk_mode.packetLossPercentage > (128-voice_est)>>4)

+          st->mode = MODE_SILK_ONLY;

+       /* When encoding voice and DTX is enabled, set the encoder to SILK mode (at least for now) */

+       if (st->silk_mode.useDTX && voice_est > 100)

           st->mode = MODE_SILK_ONLY;

 #endif

     } else {