[Opus] Update to v1.2.1

third_party/opus/src/celt/quant_bands.c

 /* Copyright (c) 2007-2008 CSIRO
    Copyright (c) 2007-2009 Xiph.Org Foundation
    Written by Jean-Marc Valin */
 /*
    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:
 
    - Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
@@ skipping 400 matching lines @@
             int q2;
             opus_val16 offset;
             q2 = error[i+c*m->nbEBands]<0 ? 0 : 1;
             ec_enc_bits(enc, q2, 1);
 #ifdef FIXED_POINT
             offset = SHR16(SHL16(q2,DB_SHIFT)-QCONST16(.5f,DB_SHIFT),fine_quant[i]+1);
 #else
             offset = (q2-.5f)*(1<<(14-fine_quant[i]-1))*(1.f/16384);
 #endif
             oldEBands[i+c*m->nbEBands] += offset;
+            error[i+c*m->nbEBands] -= offset;
             bits_left--;
          } while (++c < C);
       }
    }
 }
 
 void unquant_coarse_energy(const CELTMode *m, int start, int end, opus_val16 *oldEBands, int intra, ec_dec *dec, int C, int LM)
 {
    const unsigned char *prob_model = e_prob_model[LM][intra];
    int i, c;
@@ skipping 109 matching lines @@
    }
 }
 
 void amp2Log2(const CELTMode *m, int effEnd, int end,
       celt_ener *bandE, opus_val16 *bandLogE, int C)
 {
    int c, i;
    c=0;
    do {
       for (i=0;i<effEnd;i++)
+      {
          bandLogE[i+c*m->nbEBands] =
-               celt_log2(SHL32(bandE[i+c*m->nbEBands],2))
+               celt_log2(bandE[i+c*m->nbEBands])
                - SHL16((opus_val16)eMeans[i],6);
+#ifdef FIXED_POINT
+         /* Compensate for bandE[] being Q12 but celt_log2() taking a Q14 input. */
+         bandLogE[i+c*m->nbEBands] += QCONST16(2.f, DB_SHIFT);
+#endif
+      }
       for (i=effEnd;i<end;i++)
          bandLogE[c*m->nbEBands+i] = -QCONST16(14.f,DB_SHIFT);
    } while (++c < C);
 }