shithub: opus

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More DRED tuning

--- a/src/opus_encoder.c

+++ b/src/opus_encoder.c

@@ -597,9 +597,15 @@

       dred_frac = MIN16(.7f, 3.f*st->silk_mode.packetLossPercentage/100.f);

       bitrate_offset = 20000;

    } else {

-      dred_frac = MIN16(.8f, 4.f*st->silk_mode.packetLossPercentage/100.f);

+      if (st->silk_mode.packetLossPercentage > 5) {

+         dred_frac = MIN16(.8f, .55f + st->silk_mode.packetLossPercentage/100.f);

+      } else {

+         dred_frac = 12*st->silk_mode.packetLossPercentage/100.f;

+      }

       bitrate_offset = 12000;

    }

+   /* Account for the fact that longer packets require less redundancy. */

+   dred_frac = dred_frac/(dred_frac + (1-dred_frac)*(frame_size*50.f)/st->Fs);

    /* Approximate fit based on a few experiments. Could probably be improved. */

    q0 = IMIN(15, IMAX(4, 51 - 3*EC_ILOG(IMAX(1, bitrate_bps-bitrate_offset))));

    dQ = bitrate_bps-bitrate_offset > 36000 ? 3 : 5;

-- 

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