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Implements CELT_SET_LOSS_PERC

--- a/libcelt/celt.c

+++ b/libcelt/celt.c

@@ -144,6 +144,7 @@

    int vbr;

    int signalling;

    int constrained_vbr;      /* If zero, VBR can do whatever it likes with the rate */

+   int loss_rate;

    /* Everything beyond this point gets cleared on a reset */

 #define ENCODER_RESET_START rng

@@ -1142,6 +1143,12 @@

          if (pitch_index > COMBFILTER_MAXPERIOD-2)

             pitch_index = COMBFILTER_MAXPERIOD-2;

          gain1 = MULT16_16_Q15(QCONST16(.7f,15),gain1);

+         if (st->loss_rate>2)

+            gain1 = HALF32(gain1);

+         if (st->loss_rate>4)

+            gain1 = HALF32(gain1);

+         if (st->loss_rate>8)

+            gain1 = 0;

          prefilter_tapset = st->tapset_decision;

       } else {

          gain1 = 0;

@@ -1785,6 +1792,14 @@

             goto bad_arg;

          st->disable_pf = value<=1;

          st->force_intra = value==0;

+      }

+      break;

+      case CELT_SET_LOSS_PERC_REQUEST:

+      {

+         int value = va_arg(ap, celt_int32);

+         if (value<0 || value>100)

+            goto bad_arg;

+         st->loss_rate = value;

       }

       break;

       case CELT_SET_VBR_CONSTRAINT_REQUEST:

--- a/libcelt/celt.h

+++ b/libcelt/celt.h

@@ -112,6 +112,9 @@

 #define CELT_SET_CHANNELS_REQUEST    18

 #define CELT_SET_CHANNELS(x) CELT_SET_CHANNELS_REQUEST, _celt_check_int(x)

+#define CELT_SET_LOSS_PERC_REQUEST    20

+#define CELT_SET_LOSS_PERC(x) CELT_SET_LOSS_PERC_REQUEST, _celt_check_int(x)

+

 /* Internal */

 #define CELT_SET_START_BAND_REQUEST    10000

 #define CELT_SET_START_BAND(x) CELT_SET_START_BAND_REQUEST, _celt_check_int(x)