/src/opus/celt/quant_bands.c

Source
/* 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.

   - Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
   OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "quant_bands.h"
#include "laplace.h"
#include <math.h>
#include "os_support.h"
#include "arch.h"
#include "mathops.h"
#include "stack_alloc.h"
#include "rate.h"

#ifdef FIXED_POINT
/* Mean energy in each band quantized in Q4 */
const signed char eMeans[25] = {
      103,100, 92, 85, 81,
       77, 72, 70, 78, 75,
       73, 71, 78, 74, 69,
       72, 70, 74, 76, 71,
       60, 60, 60, 60, 60
};
#else
/* Mean energy in each band quantized in Q4 and converted back to float */
const opus_val16 eMeans[25] = {
      6.437500f, 6.250000f, 5.750000f, 5.312500f, 5.062500f,
      4.812500f, 4.500000f, 4.375000f, 4.875000f, 4.687500f,
      4.562500f, 4.437500f, 4.875000f, 4.625000f, 4.312500f,
      4.500000f, 4.375000f, 4.625000f, 4.750000f, 4.437500f,
      3.750000f, 3.750000f, 3.750000f, 3.750000f, 3.750000f
};
#endif
/* prediction coefficients: 0.9, 0.8, 0.65, 0.5 */
#ifdef FIXED_POINT
static const opus_val16 pred_coef[4] = {29440, 26112, 21248, 16384};
static const opus_val16 beta_coef[4] = {30147, 22282, 12124, 6554};
static const opus_val16 beta_intra = 4915;
#else
static const opus_val16 pred_coef[4] = {29440/32768., 26112/32768., 21248/32768., 16384/32768.};
static const opus_val16 beta_coef[4] = {30147/32768., 22282/32768., 12124/32768., 6554/32768.};
static const opus_val16 beta_intra = 4915/32768.;
#endif

/*Parameters of the Laplace-like probability models used for the coarse energy.
  There is one pair of parameters for each frame size, prediction type
   (inter/intra), and band number.
  The first number of each pair is the probability of 0, and the second is the
   decay rate, both in Q8 precision.*/
static const unsigned char e_prob_model[4][2][42] = {
   /*120 sample frames.*/
   {
      /*Inter*/
      {
          72, 127,  65, 129,  66, 128,  65, 128,  64, 128,  62, 128,  64, 128,
          64, 128,  92,  78,  92,  79,  92,  78,  90,  79, 116,  41, 115,  40,
         114,  40, 132,  26, 132,  26, 145,  17, 161,  12, 176,  10, 177,  11
      },
      /*Intra*/
      {
          24, 179,  48, 138,  54, 135,  54, 132,  53, 134,  56, 133,  55, 132,
          55, 132,  61, 114,  70,  96,  74,  88,  75,  88,  87,  74,  89,  66,
          91,  67, 100,  59, 108,  50, 120,  40, 122,  37,  97,  43,  78,  50
      }
   },
   /*240 sample frames.*/
   {
      /*Inter*/
      {
          83,  78,  84,  81,  88,  75,  86,  74,  87,  71,  90,  73,  93,  74,
          93,  74, 109,  40, 114,  36, 117,  34, 117,  34, 143,  17, 145,  18,
         146,  19, 162,  12, 165,  10, 178,   7, 189,   6, 190,   8, 177,   9
      },
      /*Intra*/
      {
          23, 178,  54, 115,  63, 102,  66,  98,  69,  99,  74,  89,  71,  91,
          73,  91,  78,  89,  86,  80,  92,  66,  93,  64, 102,  59, 103,  60,
         104,  60, 117,  52, 123,  44, 138,  35, 133,  31,  97,  38,  77,  45
      }
   },
   /*480 sample frames.*/
   {
      /*Inter*/
      {
          61,  90,  93,  60, 105,  42, 107,  41, 110,  45, 116,  38, 113,  38,
         112,  38, 124,  26, 132,  27, 136,  19, 140,  20, 155,  14, 159,  16,
         158,  18, 170,  13, 177,  10, 187,   8, 192,   6, 175,   9, 159,  10
      },
      /*Intra*/
      {
          21, 178,  59, 110,  71,  86,  75,  85,  84,  83,  91,  66,  88,  73,
          87,  72,  92,  75,  98,  72, 105,  58, 107,  54, 115,  52, 114,  55,
         112,  56, 129,  51, 132,  40, 150,  33, 140,  29,  98,  35,  77,  42
      }
   },
   /*960 sample frames.*/
   {
      /*Inter*/
      {
          42, 121,  96,  66, 108,  43, 111,  40, 117,  44, 123,  32, 120,  36,
         119,  33, 127,  33, 134,  34, 139,  21, 147,  23, 152,  20, 158,  25,
         154,  26, 166,  21, 173,  16, 184,  13, 184,  10, 150,  13, 139,  15
      },
      /*Intra*/
      {
          22, 178,  63, 114,  74,  82,  84,  83,  92,  82, 103,  62,  96,  72,
          96,  67, 101,  73, 107,  72, 113,  55, 118,  52, 125,  52, 118,  52,
         117,  55, 135,  49, 137,  39, 157,  32, 145,  29,  97,  33,  77,  40
      }
   }
};

static const unsigned char small_energy_icdf[3]={2,1,0};

static opus_val32 loss_distortion(const celt_glog *eBands, celt_glog *oldEBands, int start, int end, int len, int C)
{
   int c, i;
   opus_val32 dist = 0;
   c=0; do {
      for (i=start;i<end;i++)
      {
         celt_glog d = PSHR32(SUB32(eBands[i+c*len], oldEBands[i+c*len]), DB_SHIFT-7);
         dist = MAC16_16(dist, d,d);
      }
   } while (++c<C);
   return MIN32(200,SHR32(dist,14));
}

static int quant_coarse_energy_impl(const CELTMode *m, int start, int end,
      const celt_glog *eBands, celt_glog *oldEBands,
      opus_int32 budget, opus_int32 tell,
      const unsigned char *prob_model, celt_glog *error, ec_enc *enc,
      int C, int LM, int intra, celt_glog max_decay, int lfe)
{
   int i, c;
   int badness = 0;
   opus_val32 prev[2] = {0,0};
   opus_val16 coef;
   opus_val16 beta;

   if (tell+3 <= budget)
      ec_enc_bit_logp(enc, intra, 3);
   if (intra)
   {
      coef = 0;
      beta = beta_intra;
   } else {
      beta = beta_coef[LM];
      coef = pred_coef[LM];
   }

   /* Encode at a fixed coarse resolution */
   for (i=start;i<end;i++)
   {
      c=0;
      do {
         int bits_left;
         int qi, qi0;
         opus_val32 q;
         celt_glog x;
         opus_val32 f, tmp;
         celt_glog oldE;
         celt_glog decay_bound;
         x = eBands[i+c*m->nbEBands];
         oldE = MAXG(-GCONST(9.f), oldEBands[i+c*m->nbEBands]);
#ifdef FIXED_POINT
         f = x - MULT16_32_Q15(coef,oldE) - prev[c];
         /* Rounding to nearest integer here is really important! */
         qi = (f+QCONST32(.5f,DB_SHIFT))>>DB_SHIFT;
         decay_bound = MAXG(-GCONST(28.f), SUB32((opus_val32)oldEBands[i+c*m->nbEBands],max_decay));
#else
         f = x-coef*oldE-prev[c];
         /* Rounding to nearest integer here is really important! */
         qi = (int)floor(.5f+f);
         decay_bound = MAXG(-GCONST(28.f), oldEBands[i+c*m->nbEBands]) - max_decay;
#endif
         /* Prevent the energy from going down too quickly (e.g. for bands
            that have just one bin) */
         if (qi < 0 && x < decay_bound)
         {
            qi += (int)SHR32(SUB32(decay_bound,x), DB_SHIFT);
            if (qi > 0)
               qi = 0;
         }
         qi0 = qi;
         /* If we don't have enough bits to encode all the energy, just assume
             something safe. */
         tell = ec_tell(enc);
         bits_left = budget-tell-3*C*(end-i);
         if (i!=start && bits_left < 30)
         {
            if (bits_left < 24)
               qi = IMIN(1, qi);
            if (bits_left < 16)
               qi = IMAX(-1, qi);
         }
         if (lfe && i>=2)
            qi = IMIN(qi, 0);
         if (budget-tell >= 15)
         {
            int pi;
            pi = 2*IMIN(i,20);
            ec_laplace_encode(enc, &qi,
                  prob_model[pi]<<7, prob_model[pi+1]<<6);
         }
         else if(budget-tell >= 2)
         {
            qi = IMAX(-1, IMIN(qi, 1));
            ec_enc_icdf(enc, 2*qi^-(qi<0), small_energy_icdf, 2);
         }
         else if(budget-tell >= 1)
         {
            qi = IMIN(0, qi);
            ec_enc_bit_logp(enc, -qi, 1);
         }
         else
            qi = -1;
         error[i+c*m->nbEBands] = f - SHL32(qi,DB_SHIFT);
         badness += abs(qi0-qi);
         q = (opus_val32)SHL32(EXTEND32(qi),DB_SHIFT);

         tmp = MULT16_32_Q15(coef,oldE) + prev[c] + q;
#ifdef FIXED_POINT
         tmp = MAX32(-GCONST(28.f), tmp);
#endif
         oldEBands[i+c*m->nbEBands] = tmp;
         prev[c] = prev[c] + q - MULT16_32_Q15(beta,q);
      } while (++c < C);
   }
   return lfe ? 0 : badness;
}

void quant_coarse_energy(const CELTMode *m, int start, int end, int effEnd,
      const celt_glog *eBands, celt_glog *oldEBands, opus_uint32 budget,
      celt_glog *error, ec_enc *enc, int C, int LM, int nbAvailableBytes,
      int force_intra, opus_val32 *delayedIntra, int two_pass, int loss_rate, int lfe)
{
   int intra;
   celt_glog max_decay;
   VARDECL(celt_glog, oldEBands_intra);
   VARDECL(celt_glog, error_intra);
   ec_enc enc_start_state;
   opus_uint32 tell;
   int badness1=0;
   opus_int32 intra_bias;
   opus_val32 new_distortion;
   SAVE_STACK;

   intra = force_intra || (!two_pass && *delayedIntra>2*C*(end-start) && nbAvailableBytes > (end-start)*C);
   intra_bias = (opus_int32)((budget**delayedIntra*loss_rate)/(C*512));
   new_distortion = loss_distortion(eBands, oldEBands, start, effEnd, m->nbEBands, C);

   tell = ec_tell(enc);
   if (tell+3 > budget)
      two_pass = intra = 0;

   max_decay = GCONST(16.f);
   if (end-start>10)
   {
#ifdef FIXED_POINT
      max_decay = SHL32(MIN32(SHR32(max_decay,DB_SHIFT-3), EXTEND32(nbAvailableBytes)),DB_SHIFT-3);
#else
      max_decay = MIN32(max_decay, .125f*nbAvailableBytes);
#endif
   }
   if (lfe)
      max_decay = GCONST(3.f);
   enc_start_state = *enc;

   ALLOC(oldEBands_intra, C*m->nbEBands, celt_glog);
   ALLOC(error_intra, C*m->nbEBands, celt_glog);
   OPUS_COPY(oldEBands_intra, oldEBands, C*m->nbEBands);

   if (two_pass || intra)
   {
      badness1 = quant_coarse_energy_impl(m, start, end, eBands, oldEBands_intra, budget,
            tell, e_prob_model[LM][1], error_intra, enc, C, LM, 1, max_decay, lfe);
   }

   if (!intra)
   {
      unsigned char *intra_buf;
      ec_enc enc_intra_state;
      opus_int32 tell_intra;
      opus_uint32 nstart_bytes;
      opus_uint32 nintra_bytes;
      opus_uint32 save_bytes;
      int badness2;
      VARDECL(unsigned char, intra_bits);

      tell_intra = ec_tell_frac(enc);

      enc_intra_state = *enc;

      nstart_bytes = ec_range_bytes(&enc_start_state);
      nintra_bytes = ec_range_bytes(&enc_intra_state);
      intra_buf = ec_get_buffer(&enc_intra_state) + nstart_bytes;
      save_bytes = nintra_bytes-nstart_bytes;
      if (save_bytes == 0)
         save_bytes = ALLOC_NONE;
      ALLOC(intra_bits, save_bytes, unsigned char);
      /* Copy bits from intra bit-stream */
      OPUS_COPY(intra_bits, intra_buf, nintra_bytes - nstart_bytes);

      *enc = enc_start_state;

      badness2 = quant_coarse_energy_impl(m, start, end, eBands, oldEBands, budget,
            tell, e_prob_model[LM][intra], error, enc, C, LM, 0, max_decay, lfe);

      if (two_pass && (badness1 < badness2 || (badness1 == badness2 && ((opus_int32)ec_tell_frac(enc))+intra_bias > tell_intra)))
      {
         *enc = enc_intra_state;
         /* Copy intra bits to bit-stream */
         OPUS_COPY(intra_buf, intra_bits, nintra_bytes - nstart_bytes);
         OPUS_COPY(oldEBands, oldEBands_intra, C*m->nbEBands);
         OPUS_COPY(error, error_intra, C*m->nbEBands);
         intra = 1;
      }
   } else {
      OPUS_COPY(oldEBands, oldEBands_intra, C*m->nbEBands);
      OPUS_COPY(error, error_intra, C*m->nbEBands);
   }

   if (intra)
      *delayedIntra = new_distortion;
   else
      *delayedIntra = ADD32(MULT16_32_Q15(MULT16_16_Q15(pred_coef[LM], pred_coef[LM]),*delayedIntra),
            new_distortion);

   RESTORE_STACK;
}

void quant_fine_energy(const CELTMode *m, int start, int end, celt_glog *oldEBands, celt_glog *error, int *prev_quant, int *extra_quant, ec_enc *enc, int C)
{
   int i, c;
   /* Encode finer resolution */
   for (i=start;i<end;i++)
   {
      opus_int16 extra, prev;
      extra = 1<<extra_quant[i];
      if (extra_quant[i] <= 0)
         continue;
      if (ec_tell(enc)+C*extra_quant[i] > (opus_int32)enc->storage*8) continue;
      prev = (prev_quant!=NULL) ? prev_quant[i] : 0;
      c=0;
      do {
         int q2;
         celt_glog offset;
#ifdef FIXED_POINT
         /* Has to be without rounding */
         q2 = VSHR32(ADD32(error[i+c*m->nbEBands], SHR32(GCONST(.5f), prev)), DB_SHIFT-extra_quant[i]-prev);
#else
         q2 = (int)floor((error[i+c*m->nbEBands]*(1<<prev)+.5f)*extra);
#endif
         if (q2 > extra-1)
            q2 = extra-1;
         if (q2<0)
            q2 = 0;
         ec_enc_bits(enc, q2, extra_quant[i]);
#ifdef FIXED_POINT
         offset = SUB32(VSHR32(2*q2+1, extra_quant[i]-DB_SHIFT+1), GCONST(.5f));
         offset = SHR32(offset, prev);
#else
         offset = (q2+.5f)*(1<<(14-extra_quant[i]))*(1.f/16384) - .5f;
         offset *= (1<<(14-prev))*(1.f/16384);
#endif
         oldEBands[i+c*m->nbEBands] += offset;
         error[i+c*m->nbEBands] -= offset;
         /*printf ("%f ", error[i] - offset);*/
      } while (++c < C);
   }
}

void quant_energy_finalise(const CELTMode *m, int start, int end, celt_glog *oldEBands, celt_glog *error, int *fine_quant, int *fine_priority, int bits_left, ec_enc *enc, int C)
{
   int i, prio, c;

   /* Use up the remaining bits */
   for (prio=0;prio<2;prio++)
   {
      for (i=start;i<end && bits_left>=C ;i++)
      {
         if (fine_quant[i] >= MAX_FINE_BITS || fine_priority[i]!=prio)
            continue;
         c=0;
         do {
            int q2;
            celt_glog offset;
            q2 = error[i+c*m->nbEBands]<0 ? 0 : 1;
            ec_enc_bits(enc, q2, 1);
#ifdef FIXED_POINT
            offset = SHR32(SHL32(q2,DB_SHIFT)-GCONST(.5f),fine_quant[i]+1);
#else
            offset = (q2-.5f)*(1<<(14-fine_quant[i]-1))*(1.f/16384);
#endif
            if (oldEBands != NULL) 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, celt_glog *oldEBands, int intra, ec_dec *dec, int C, int LM)
{
   const unsigned char *prob_model = e_prob_model[LM][intra];
   int i, c;
   opus_val64 prev[2] = {0, 0};
   opus_val16 coef;
   opus_val16 beta;
   opus_int32 budget;
   opus_int32 tell;

   if (intra)
   {
      coef = 0;
      beta = beta_intra;
   } else {
      beta = beta_coef[LM];
      coef = pred_coef[LM];
   }

   budget = dec->storage*8;

   /* Decode at a fixed coarse resolution */
   for (i=start;i<end;i++)
   {
      c=0;
      do {
         int qi;
         opus_val32 q;
         opus_val32 tmp;
         /* It would be better to express this invariant as a
            test on C at function entry, but that isn't enough
            to make the static analyzer happy. */
         celt_sig_assert(c<2);
         tell = ec_tell(dec);
         if(budget-tell>=15)
         {
            int pi;
            pi = 2*IMIN(i,20);
            qi = ec_laplace_decode(dec,
                  prob_model[pi]<<7, prob_model[pi+1]<<6);
         }
         else if(budget-tell>=2)
         {
            qi = ec_dec_icdf(dec, small_energy_icdf, 2);
            qi = (qi>>1)^-(qi&1);
         }
         else if(budget-tell>=1)
         {
            qi = -ec_dec_bit_logp(dec, 1);
         }
         else
            qi = -1;
         q = (opus_val32)SHL32(EXTEND32(qi),DB_SHIFT);

         oldEBands[i+c*m->nbEBands] = MAXG(-GCONST(9.f), oldEBands[i+c*m->nbEBands]);
         tmp = MULT16_32_Q15(coef,oldEBands[i+c*m->nbEBands]) + prev[c] + q;
#ifdef FIXED_POINT
         tmp = MIN32(GCONST(28.f), MAX32(-GCONST(28.f), tmp));
#endif
         oldEBands[i+c*m->nbEBands] = tmp;
         prev[c] = prev[c] + q - MULT16_32_Q15(beta,q);
      } while (++c < C);
   }
}

void unquant_fine_energy(const CELTMode *m, int start, int end, celt_glog *oldEBands, int *prev_quant, int *extra_quant, ec_dec *dec, int C)
{
   int i, c;
   /* Decode finer resolution */
   for (i=start;i<end;i++)
   {
      opus_int16 extra, prev;
      extra = extra_quant[i];
      if (extra_quant[i] <= 0)
         continue;
      if (ec_tell(dec)+C*extra_quant[i] > (opus_int32)dec->storage*8) continue;
      prev = (prev_quant!=NULL) ? prev_quant[i] : 0;
      c=0;
      do {
         int q2;
         celt_glog offset;
         q2 = ec_dec_bits(dec, extra);
#ifdef FIXED_POINT
         offset = SUB32(VSHR32(2*q2+1, extra-DB_SHIFT+1), GCONST(.5f));
         offset = SHR32(offset, prev);
#else
         offset = (q2+.5f)*(1<<(14-extra))*(1.f/16384) - .5f;
         offset *= (1<<(14-prev))*(1.f/16384);
#endif
         oldEBands[i+c*m->nbEBands] += offset;
      } while (++c < C);
   }
}

void unquant_energy_finalise(const CELTMode *m, int start, int end, celt_glog *oldEBands, int *fine_quant,  int *fine_priority, int bits_left, ec_dec *dec, int C)
{
   int i, prio, c;

   /* Use up the remaining bits */
   for (prio=0;prio<2;prio++)
   {
      for (i=start;i<end && bits_left>=C ;i++)
      {
         if (fine_quant[i] >= MAX_FINE_BITS || fine_priority[i]!=prio)
            continue;
         c=0;
         do {
            int q2;
            celt_glog offset;
            q2 = ec_dec_bits(dec, 1);
#ifdef FIXED_POINT
            offset = SHR32(SHL32(q2,DB_SHIFT)-GCONST(.5f),fine_quant[i]+1);
#else
            offset = (q2-.5f)*(1<<(14-fine_quant[i]-1))*(1.f/16384);
#endif
            if (oldEBands != NULL) oldEBands[i+c*m->nbEBands] += offset;
            bits_left--;
         } while (++c < C);
      }
   }
}

void amp2Log2(const CELTMode *m, int effEnd, int end,
      celt_ener *bandE, celt_glog *bandLogE, int C)
{
   int c, i;
   c=0;
   do {
      for (i=0;i<effEnd;i++)
      {
         bandLogE[i+c*m->nbEBands] =
               celt_log2_db(bandE[i+c*m->nbEBands])
               - SHL32((celt_glog)eMeans[i],DB_SHIFT-4);
#ifdef FIXED_POINT
         /* Compensate for bandE[] being Q12 but celt_log2() taking a Q14 input. */
         bandLogE[i+c*m->nbEBands] += GCONST(2.f);
#endif
      }
      for (i=effEnd;i<end;i++)
         bandLogE[c*m->nbEBands+i] = -GCONST(14.f);
   } while (++c < C);
}

Coverage Report

Created: 2025-11-16 07:20

Line	Count	Source
1		/* Copyright (c) 2007-2008 CSIRO
2		Copyright (c) 2007-2009 Xiph.Org Foundation
3		Written by Jean-Marc Valin */
4		/*
5		Redistribution and use in source and binary forms, with or without
6		modification, are permitted provided that the following conditions
7		are met:
8
9		- Redistributions of source code must retain the above copyright
10		notice, this list of conditions and the following disclaimer.
11
12		- Redistributions in binary form must reproduce the above copyright
13		notice, this list of conditions and the following disclaimer in the
14		documentation and/or other materials provided with the distribution.
15
16		THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17		``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18		LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19		A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
20		OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
21		EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22		PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
23		PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
24		LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
25		NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26		SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27		*/
28
29		#ifdef HAVE_CONFIG_H
30		#include "config.h"
31		#endif
32
33		#include "quant_bands.h"
34		#include "laplace.h"
35		#include <math.h>
36		#include "os_support.h"
37		#include "arch.h"
38		#include "mathops.h"
39		#include "stack_alloc.h"
40		#include "rate.h"
41
42		#ifdef FIXED_POINT
43		/* Mean energy in each band quantized in Q4 */
44		const signed char eMeans[25] = {
45		103,100, 92, 85, 81,
46		77, 72, 70, 78, 75,
47		73, 71, 78, 74, 69,
48		72, 70, 74, 76, 71,
49		60, 60, 60, 60, 60
50		};
51		#else
52		/* Mean energy in each band quantized in Q4 and converted back to float */
53		const opus_val16 eMeans[25] = {
54		6.437500f, 6.250000f, 5.750000f, 5.312500f, 5.062500f,
55		4.812500f, 4.500000f, 4.375000f, 4.875000f, 4.687500f,
56		4.562500f, 4.437500f, 4.875000f, 4.625000f, 4.312500f,
57		4.500000f, 4.375000f, 4.625000f, 4.750000f, 4.437500f,
58		3.750000f, 3.750000f, 3.750000f, 3.750000f, 3.750000f
59		};
60		#endif
61		/* prediction coefficients: 0.9, 0.8, 0.65, 0.5 */
62		#ifdef FIXED_POINT
63		static const opus_val16 pred_coef[4] = {29440, 26112, 21248, 16384};
64		static const opus_val16 beta_coef[4] = {30147, 22282, 12124, 6554};
65		static const opus_val16 beta_intra = 4915;
66		#else
67		static const opus_val16 pred_coef[4] = {29440/32768., 26112/32768., 21248/32768., 16384/32768.};
68		static const opus_val16 beta_coef[4] = {30147/32768., 22282/32768., 12124/32768., 6554/32768.};
69		static const opus_val16 beta_intra = 4915/32768.;
70		#endif
71
72		/*Parameters of the Laplace-like probability models used for the coarse energy.
73		There is one pair of parameters for each frame size, prediction type
74		(inter/intra), and band number.
75		The first number of each pair is the probability of 0, and the second is the
76		decay rate, both in Q8 precision.*/
77		static const unsigned char e_prob_model[4][2][42] = {
78		/120 sample frames./
79		{
80		/Inter/
81		{
82		72, 127, 65, 129, 66, 128, 65, 128, 64, 128, 62, 128, 64, 128,
83		64, 128, 92, 78, 92, 79, 92, 78, 90, 79, 116, 41, 115, 40,
84		114, 40, 132, 26, 132, 26, 145, 17, 161, 12, 176, 10, 177, 11
85		},
86		/Intra/
87		{
88		24, 179, 48, 138, 54, 135, 54, 132, 53, 134, 56, 133, 55, 132,
89		55, 132, 61, 114, 70, 96, 74, 88, 75, 88, 87, 74, 89, 66,
90		91, 67, 100, 59, 108, 50, 120, 40, 122, 37, 97, 43, 78, 50
91		}
92		},
93		/240 sample frames./
94		{
95		/Inter/
96		{
97		83, 78, 84, 81, 88, 75, 86, 74, 87, 71, 90, 73, 93, 74,
98		93, 74, 109, 40, 114, 36, 117, 34, 117, 34, 143, 17, 145, 18,
99		146, 19, 162, 12, 165, 10, 178, 7, 189, 6, 190, 8, 177, 9
100		},
101		/Intra/
102		{
103		23, 178, 54, 115, 63, 102, 66, 98, 69, 99, 74, 89, 71, 91,
104		73, 91, 78, 89, 86, 80, 92, 66, 93, 64, 102, 59, 103, 60,
105		104, 60, 117, 52, 123, 44, 138, 35, 133, 31, 97, 38, 77, 45
106		}
107		},
108		/480 sample frames./
109		{
110		/Inter/
111		{
112		61, 90, 93, 60, 105, 42, 107, 41, 110, 45, 116, 38, 113, 38,
113		112, 38, 124, 26, 132, 27, 136, 19, 140, 20, 155, 14, 159, 16,
114		158, 18, 170, 13, 177, 10, 187, 8, 192, 6, 175, 9, 159, 10
115		},
116		/Intra/
117		{
118		21, 178, 59, 110, 71, 86, 75, 85, 84, 83, 91, 66, 88, 73,
119		87, 72, 92, 75, 98, 72, 105, 58, 107, 54, 115, 52, 114, 55,
120		112, 56, 129, 51, 132, 40, 150, 33, 140, 29, 98, 35, 77, 42
121		}
122		},
123		/960 sample frames./
124		{
125		/Inter/
126		{
127		42, 121, 96, 66, 108, 43, 111, 40, 117, 44, 123, 32, 120, 36,
128		119, 33, 127, 33, 134, 34, 139, 21, 147, 23, 152, 20, 158, 25,
129		154, 26, 166, 21, 173, 16, 184, 13, 184, 10, 150, 13, 139, 15
130		},
131		/Intra/
132		{
133		22, 178, 63, 114, 74, 82, 84, 83, 92, 82, 103, 62, 96, 72,
134		96, 67, 101, 73, 107, 72, 113, 55, 118, 52, 125, 52, 118, 52,
135		117, 55, 135, 49, 137, 39, 157, 32, 145, 29, 97, 33, 77, 40
136		}
137		}
138		};
139
140		static const unsigned char small_energy_icdf[3]={2,1,0};
141
142		static opus_val32 loss_distortion(const celt_glog eBands, celt_glog oldEBands, int start, int end, int len, int C)
143	0	{
144	0	int c, i;
145	0	opus_val32 dist = 0;
146	0	c=0; do {
147	0	for (i=start;i<end;i++)
148	0	{
149	0	celt_glog d = PSHR32(SUB32(eBands[i+clen], oldEBands[i+clen]), DB_SHIFT-7);
150	0	dist = MAC16_16(dist, d,d);
151	0	}
152	0	} while (++c<C);
153	0	return MIN32(200,SHR32(dist,14));
154	0	}
155
156		static int quant_coarse_energy_impl(const CELTMode *m, int start, int end,
157		const celt_glog eBands, celt_glog oldEBands,
158		opus_int32 budget, opus_int32 tell,
159		const unsigned char prob_model, celt_glog error, ec_enc *enc,
160		int C, int LM, int intra, celt_glog max_decay, int lfe)
161	0	{
162	0	int i, c;
163	0	int badness = 0;
164	0	opus_val32 prev[2] = {0,0};
165	0	opus_val16 coef;
166	0	opus_val16 beta;
167
168	0	if (tell+3 <= budget)
169	0	ec_enc_bit_logp(enc, intra, 3);
170	0	if (intra)
171	0	{
172	0	coef = 0;
173	0	beta = beta_intra;
174	0	} else {
175	0	beta = beta_coef[LM];
176	0	coef = pred_coef[LM];
177	0	}
178
179		/* Encode at a fixed coarse resolution */
180	0	for (i=start;i<end;i++)
181	0	{
182	0	c=0;
183	0	do {
184	0	int bits_left;
185	0	int qi, qi0;
186	0	opus_val32 q;
187	0	celt_glog x;
188	0	opus_val32 f, tmp;
189	0	celt_glog oldE;
190	0	celt_glog decay_bound;
191	0	x = eBands[i+c*m->nbEBands];
192	0	oldE = MAXG(-GCONST(9.f), oldEBands[i+c*m->nbEBands]);
193		#ifdef FIXED_POINT
194		f = x - MULT16_32_Q15(coef,oldE) - prev[c];
195		/* Rounding to nearest integer here is really important! */
196		qi = (f+QCONST32(.5f,DB_SHIFT))>>DB_SHIFT;
197		decay_bound = MAXG(-GCONST(28.f), SUB32((opus_val32)oldEBands[i+c*m->nbEBands],max_decay));
198		#else
199	0	f = x-coef*oldE-prev[c];
200		/* Rounding to nearest integer here is really important! */
201	0	qi = (int)floor(.5f+f);
202	0	decay_bound = MAXG(-GCONST(28.f), oldEBands[i+c*m->nbEBands]) - max_decay;
203	0	#endif
204		/* Prevent the energy from going down too quickly (e.g. for bands
205		that have just one bin) */
206	0	if (qi < 0 && x < decay_bound)
207	0	{
208	0	qi += (int)SHR32(SUB32(decay_bound,x), DB_SHIFT);
209	0	if (qi > 0)
210	0	qi = 0;
211	0	}
212	0	qi0 = qi;
213		/* If we don't have enough bits to encode all the energy, just assume
214		something safe. */
215	0	tell = ec_tell(enc);
216	0	bits_left = budget-tell-3C(end-i);
217	0	if (i!=start && bits_left < 30)
218	0	{
219	0	if (bits_left < 24)
220	0	qi = IMIN(1, qi);
221	0	if (bits_left < 16)
222	0	qi = IMAX(-1, qi);
223	0	}
224	0	if (lfe && i>=2)
225	0	qi = IMIN(qi, 0);
226	0	if (budget-tell >= 15)
227	0	{
228	0	int pi;
229	0	pi = 2*IMIN(i,20);
230	0	ec_laplace_encode(enc, &qi,
231	0	prob_model[pi]<<7, prob_model[pi+1]<<6);
232	0	}
233	0	else if(budget-tell >= 2)
234	0	{
235	0	qi = IMAX(-1, IMIN(qi, 1));
236	0	ec_enc_icdf(enc, 2*qi^-(qi<0), small_energy_icdf, 2);
237	0	}
238	0	else if(budget-tell >= 1)
239	0	{
240	0	qi = IMIN(0, qi);
241	0	ec_enc_bit_logp(enc, -qi, 1);
242	0	}
243	0	else
244	0	qi = -1;
245	0	error[i+c*m->nbEBands] = f - SHL32(qi,DB_SHIFT);
246	0	badness += abs(qi0-qi);
247	0	q = (opus_val32)SHL32(EXTEND32(qi),DB_SHIFT);
248
249	0	tmp = MULT16_32_Q15(coef,oldE) + prev[c] + q;
250		#ifdef FIXED_POINT
251		tmp = MAX32(-GCONST(28.f), tmp);
252		#endif
253	0	oldEBands[i+c*m->nbEBands] = tmp;
254	0	prev[c] = prev[c] + q - MULT16_32_Q15(beta,q);
255	0	} while (++c < C);
256	0	}
257	0	return lfe ? 0 : badness;
258	0	}
259
260		void quant_coarse_energy(const CELTMode *m, int start, int end, int effEnd,
261		const celt_glog eBands, celt_glog oldEBands, opus_uint32 budget,
262		celt_glog error, ec_enc enc, int C, int LM, int nbAvailableBytes,
263		int force_intra, opus_val32 *delayedIntra, int two_pass, int loss_rate, int lfe)
264	0	{
265	0	int intra;
266	0	celt_glog max_decay;
267	0	VARDECL(celt_glog, oldEBands_intra);
268	0	VARDECL(celt_glog, error_intra);
269	0	ec_enc enc_start_state;
270	0	opus_uint32 tell;
271	0	int badness1=0;
272	0	opus_int32 intra_bias;
273	0	opus_val32 new_distortion;
274	0	SAVE_STACK;
275
276	0	intra = force_intra \|\| (!two_pass && delayedIntra>2C(end-start) && nbAvailableBytes > (end-start)C);
277	0	intra_bias = (opus_int32)((budget*delayedIntraloss_rate)/(C*512));
278	0	new_distortion = loss_distortion(eBands, oldEBands, start, effEnd, m->nbEBands, C);
279
280	0	tell = ec_tell(enc);
281	0	if (tell+3 > budget)
282	0	two_pass = intra = 0;
283
284	0	max_decay = GCONST(16.f);
285	0	if (end-start>10)
286	0	{
287		#ifdef FIXED_POINT
288		max_decay = SHL32(MIN32(SHR32(max_decay,DB_SHIFT-3), EXTEND32(nbAvailableBytes)),DB_SHIFT-3);
289		#else
290	0	max_decay = MIN32(max_decay, .125f*nbAvailableBytes);
291	0	#endif
292	0	}
293	0	if (lfe)
294	0	max_decay = GCONST(3.f);
295	0	enc_start_state = *enc;
296
297	0	ALLOC(oldEBands_intra, C*m->nbEBands, celt_glog);
298	0	ALLOC(error_intra, C*m->nbEBands, celt_glog);
299	0	OPUS_COPY(oldEBands_intra, oldEBands, C*m->nbEBands);
300
301	0	if (two_pass \|\| intra)
302	0	{
303	0	badness1 = quant_coarse_energy_impl(m, start, end, eBands, oldEBands_intra, budget,
304	0	tell, e_prob_model[LM][1], error_intra, enc, C, LM, 1, max_decay, lfe);
305	0	}
306
307	0	if (!intra)
308	0	{
309	0	unsigned char *intra_buf;
310	0	ec_enc enc_intra_state;
311	0	opus_int32 tell_intra;
312	0	opus_uint32 nstart_bytes;
313	0	opus_uint32 nintra_bytes;
314	0	opus_uint32 save_bytes;
315	0	int badness2;
316	0	VARDECL(unsigned char, intra_bits);
317
318	0	tell_intra = ec_tell_frac(enc);
319
320	0	enc_intra_state = *enc;
321
322	0	nstart_bytes = ec_range_bytes(&enc_start_state);
323	0	nintra_bytes = ec_range_bytes(&enc_intra_state);
324	0	intra_buf = ec_get_buffer(&enc_intra_state) + nstart_bytes;
325	0	save_bytes = nintra_bytes-nstart_bytes;
326	0	if (save_bytes == 0)
327	0	save_bytes = ALLOC_NONE;
328	0	ALLOC(intra_bits, save_bytes, unsigned char);
329		/* Copy bits from intra bit-stream */
330	0	OPUS_COPY(intra_bits, intra_buf, nintra_bytes - nstart_bytes);
331
332	0	*enc = enc_start_state;
333
334	0	badness2 = quant_coarse_energy_impl(m, start, end, eBands, oldEBands, budget,
335	0	tell, e_prob_model[LM][intra], error, enc, C, LM, 0, max_decay, lfe);
336
337	0	if (two_pass && (badness1 < badness2 \|\| (badness1 == badness2 && ((opus_int32)ec_tell_frac(enc))+intra_bias > tell_intra)))
338	0	{
339	0	*enc = enc_intra_state;
340		/* Copy intra bits to bit-stream */
341	0	OPUS_COPY(intra_buf, intra_bits, nintra_bytes - nstart_bytes);
342	0	OPUS_COPY(oldEBands, oldEBands_intra, C*m->nbEBands);
343	0	OPUS_COPY(error, error_intra, C*m->nbEBands);
344	0	intra = 1;
345	0	}
346	0	} else {
347	0	OPUS_COPY(oldEBands, oldEBands_intra, C*m->nbEBands);
348	0	OPUS_COPY(error, error_intra, C*m->nbEBands);
349	0	}
350
351	0	if (intra)
352	0	*delayedIntra = new_distortion;
353	0	else
354	0	delayedIntra = ADD32(MULT16_32_Q15(MULT16_16_Q15(pred_coef[LM], pred_coef[LM]),delayedIntra),
355	0	new_distortion);
356
357	0	RESTORE_STACK;
358	0	}
359
360		void quant_fine_energy(const CELTMode m, int start, int end, celt_glog oldEBands, celt_glog error, int prev_quant, int extra_quant, ec_enc enc, int C)
361	0	{
362	0	int i, c;
363		/* Encode finer resolution */
364	0	for (i=start;i<end;i++)
365	0	{
366	0	opus_int16 extra, prev;
367	0	extra = 1<<extra_quant[i];
368	0	if (extra_quant[i] <= 0)
369	0	continue;
370	0	if (ec_tell(enc)+Cextra_quant[i] > (opus_int32)enc->storage8) continue;
371	0	prev = (prev_quant!=NULL) ? prev_quant[i] : 0;
372	0	c=0;
373	0	do {
374	0	int q2;
375	0	celt_glog offset;
376		#ifdef FIXED_POINT
377		/* Has to be without rounding */
378		q2 = VSHR32(ADD32(error[i+c*m->nbEBands], SHR32(GCONST(.5f), prev)), DB_SHIFT-extra_quant[i]-prev);
379		#else
380	0	q2 = (int)floor((error[i+cm->nbEBands](1<<prev)+.5f)*extra);
381	0	#endif
382	0	if (q2 > extra-1)
383	0	q2 = extra-1;
384	0	if (q2<0)
385	0	q2 = 0;
386	0	ec_enc_bits(enc, q2, extra_quant[i]);
387		#ifdef FIXED_POINT
388		offset = SUB32(VSHR32(2*q2+1, extra_quant[i]-DB_SHIFT+1), GCONST(.5f));
389		offset = SHR32(offset, prev);
390		#else
391	0	offset = (q2+.5f)(1<<(14-extra_quant[i]))(1.f/16384) - .5f;
392	0	offset = (1<<(14-prev))(1.f/16384);
393	0	#endif
394	0	oldEBands[i+c*m->nbEBands] += offset;
395	0	error[i+c*m->nbEBands] -= offset;
396		/printf ("%f ", error[i] - offset);/
397	0	} while (++c < C);
398	0	}
399	0	}
400
401		void quant_energy_finalise(const CELTMode m, int start, int end, celt_glog oldEBands, celt_glog error, int fine_quant, int fine_priority, int bits_left, ec_enc enc, int C)
402	0	{
403	0	int i, prio, c;
404
405		/* Use up the remaining bits */
406	0	for (prio=0;prio<2;prio++)
407	0	{
408	0	for (i=start;i<end && bits_left>=C ;i++)
409	0	{
410	0	if (fine_quant[i] >= MAX_FINE_BITS \|\| fine_priority[i]!=prio)
411	0	continue;
412	0	c=0;
413	0	do {
414	0	int q2;
415	0	celt_glog offset;
416	0	q2 = error[i+c*m->nbEBands]<0 ? 0 : 1;
417	0	ec_enc_bits(enc, q2, 1);
418		#ifdef FIXED_POINT
419		offset = SHR32(SHL32(q2,DB_SHIFT)-GCONST(.5f),fine_quant[i]+1);
420		#else
421	0	offset = (q2-.5f)(1<<(14-fine_quant[i]-1))(1.f/16384);
422	0	#endif
423	0	if (oldEBands != NULL) oldEBands[i+c*m->nbEBands] += offset;
424	0	error[i+c*m->nbEBands] -= offset;
425	0	bits_left--;
426	0	} while (++c < C);
427	0	}
428	0	}
429	0	}
430
431		void unquant_coarse_energy(const CELTMode m, int start, int end, celt_glog oldEBands, int intra, ec_dec *dec, int C, int LM)
432	112k	{
433	112k	const unsigned char *prob_model = e_prob_model[LM][intra];
434	112k	int i, c;
435	112k	opus_val64 prev[2] = {0, 0};
436	112k	opus_val16 coef;
437	112k	opus_val16 beta;
438	112k	opus_int32 budget;
439	112k	opus_int32 tell;
440
441	112k	if (intra)
442	7.84k	{
443	7.84k	coef = 0;
444	7.84k	beta = beta_intra;
445	104k	} else {
446	104k	beta = beta_coef[LM];
447	104k	coef = pred_coef[LM];
448	104k	}
449
450	112k	budget = dec->storage*8;
451
452		/* Decode at a fixed coarse resolution */
453	1.42M	for (i=start;i<end;i++)
454	1.30M	{
455	1.30M	c=0;
456	1.62M	do {
457	1.62M	int qi;
458	1.62M	opus_val32 q;
459	1.62M	opus_val32 tmp;
460		/* It would be better to express this invariant as a
461		test on C at function entry, but that isn't enough
462		to make the static analyzer happy. */
463	1.62M	celt_sig_assert(c<2);
464	1.62M	tell = ec_tell(dec);
465	1.62M	if(budget-tell>=15)
466	1.15M	{
467	1.15M	int pi;
468	1.15M	pi = 2*IMIN(i,20);
469	1.15M	qi = ec_laplace_decode(dec,
470	1.15M	prob_model[pi]<<7, prob_model[pi+1]<<6);
471	1.15M	}
472	470k	else if(budget-tell>=2)
473	153k	{
474	153k	qi = ec_dec_icdf(dec, small_energy_icdf, 2);
475	153k	qi = (qi>>1)^-(qi&1);
476	153k	}
477	316k	else if(budget-tell>=1)
478	7.25k	{
479	7.25k	qi = -ec_dec_bit_logp(dec, 1);
480	7.25k	}
481	309k	else
482	309k	qi = -1;
483	1.62M	q = (opus_val32)SHL32(EXTEND32(qi),DB_SHIFT);
484
485	1.62M	oldEBands[i+cm->nbEBands] = MAXG(-GCONST(9.f), oldEBands[i+cm->nbEBands]);
486	1.62M	tmp = MULT16_32_Q15(coef,oldEBands[i+c*m->nbEBands]) + prev[c] + q;
487		#ifdef FIXED_POINT
488		tmp = MIN32(GCONST(28.f), MAX32(-GCONST(28.f), tmp));
489		#endif
490	1.62M	oldEBands[i+c*m->nbEBands] = tmp;
491	1.62M	prev[c] = prev[c] + q - MULT16_32_Q15(beta,q);
492	1.62M	} while (++c < C);
493	1.30M	}
494	112k	}
495
496		void unquant_fine_energy(const CELTMode m, int start, int end, celt_glog oldEBands, int prev_quant, int extra_quant, ec_dec *dec, int C)
497	112k	{
498	112k	int i, c;
499		/* Decode finer resolution */
500	1.42M	for (i=start;i<end;i++)
501	1.30M	{
502	1.30M	opus_int16 extra, prev;
503	1.30M	extra = extra_quant[i];
504	1.30M	if (extra_quant[i] <= 0)
505	661k	continue;
506	648k	if (ec_tell(dec)+Cextra_quant[i] > (opus_int32)dec->storage8) continue;
507	648k	prev = (prev_quant!=NULL) ? prev_quant[i] : 0;
508	648k	c=0;
509	805k	do {
510	805k	int q2;
511	805k	celt_glog offset;
512	805k	q2 = ec_dec_bits(dec, extra);
513		#ifdef FIXED_POINT
514		offset = SUB32(VSHR32(2*q2+1, extra-DB_SHIFT+1), GCONST(.5f));
515		offset = SHR32(offset, prev);
516		#else
517	805k	offset = (q2+.5f)(1<<(14-extra))(1.f/16384) - .5f;
518	805k	offset = (1<<(14-prev))(1.f/16384);
519	805k	#endif
520	805k	oldEBands[i+c*m->nbEBands] += offset;
521	805k	} while (++c < C);
522	648k	}
523	112k	}
524
525		void unquant_energy_finalise(const CELTMode m, int start, int end, celt_glog oldEBands, int fine_quant, int fine_priority, int bits_left, ec_dec *dec, int C)
526	112k	{
527	112k	int i, prio, c;
528
529		/* Use up the remaining bits */
530	336k	for (prio=0;prio<2;prio++)
531	224k	{
532	870k	for (i=start;i<end && bits_left>=C ;i++)
533	646k	{
534	646k	if (fine_quant[i] >= MAX_FINE_BITS \|\| fine_priority[i]!=prio)
535	482k	continue;
536	163k	c=0;
537	205k	do {
538	205k	int q2;
539	205k	celt_glog offset;
540	205k	q2 = ec_dec_bits(dec, 1);
541		#ifdef FIXED_POINT
542		offset = SHR32(SHL32(q2,DB_SHIFT)-GCONST(.5f),fine_quant[i]+1);
543		#else
544	205k	offset = (q2-.5f)(1<<(14-fine_quant[i]-1))(1.f/16384);
545	205k	#endif
546	205k	if (oldEBands != NULL) oldEBands[i+c*m->nbEBands] += offset;
547	205k	bits_left--;
548	205k	} while (++c < C);
549	163k	}
550	224k	}
551	112k	}
552
553		void amp2Log2(const CELTMode *m, int effEnd, int end,
554		celt_ener bandE, celt_glog bandLogE, int C)
555	0	{
556	0	int c, i;
557	0	c=0;
558	0	do {
559	0	for (i=0;i<effEnd;i++)
560	0	{
561	0	bandLogE[i+c*m->nbEBands] =
562	0	celt_log2_db(bandE[i+c*m->nbEBands])
563	0	- SHL32((celt_glog)eMeans[i],DB_SHIFT-4);
564		#ifdef FIXED_POINT
565		/* Compensate for bandE[] being Q12 but celt_log2() taking a Q14 input. */
566		bandLogE[i+c*m->nbEBands] += GCONST(2.f);
567		#endif
568	0	}
569	0	for (i=effEnd;i<end;i++)
570	0	bandLogE[c*m->nbEBands+i] = -GCONST(14.f);
571	0	} while (++c < C);
572	0	}