celt_encoder.c 76.6 KB
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/* Copyright (c) 2007-2008 CSIRO
   Copyright (c) 2007-2010 Xiph.Org Foundation
   Copyright (c) 2008 Gregory Maxwell
   Written by Jean-Marc Valin and Gregory Maxwell */
/*
   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

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#define CELT_ENCODER_C
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#include "cpu_support.h"
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#include "os_support.h"
#include "mdct.h"
#include <math.h>
#include "celt.h"
#include "pitch.h"
#include "bands.h"
#include "modes.h"
#include "entcode.h"
#include "quant_bands.h"
#include "rate.h"
#include "stack_alloc.h"
#include "mathops.h"
#include "float_cast.h"
#include <stdarg.h>
#include "celt_lpc.h"
#include "vq.h"


/** Encoder state
 @brief Encoder state
 */
struct OpusCustomEncoder {
   const OpusCustomMode *mode;     /**< Mode used by the encoder */
   int channels;
   int stream_channels;

   int force_intra;
   int clip;
   int disable_pf;
   int complexity;
   int upsample;
   int start, end;

   opus_int32 bitrate;
   int vbr;
   int signalling;
   int constrained_vbr;      /* If zero, VBR can do whatever it likes with the rate */
   int loss_rate;
   int lsb_depth;
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   int variable_duration;
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   int lfe;
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   int arch;
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   /* Everything beyond this point gets cleared on a reset */
#define ENCODER_RESET_START rng

   opus_uint32 rng;
   int spread_decision;
   opus_val32 delayedIntra;
   int tonal_average;
   int lastCodedBands;
   int hf_average;
   int tapset_decision;

   int prefilter_period;
   opus_val16 prefilter_gain;
   int prefilter_tapset;
#ifdef RESYNTH
   int prefilter_period_old;
   opus_val16 prefilter_gain_old;
   int prefilter_tapset_old;
#endif
   int consec_transient;
   AnalysisInfo analysis;
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   SILKInfo silk_info;
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   opus_val32 preemph_memE[2];
   opus_val32 preemph_memD[2];

   /* VBR-related parameters */
   opus_int32 vbr_reservoir;
   opus_int32 vbr_drift;
   opus_int32 vbr_offset;
   opus_int32 vbr_count;
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   opus_val32 overlap_max;
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   opus_val16 stereo_saving;
   int intensity;
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   opus_val16 *energy_mask;
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   opus_val16 spec_avg;
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#ifdef RESYNTH
   /* +MAX_PERIOD/2 to make space for overlap */
   celt_sig syn_mem[2][2*MAX_PERIOD+MAX_PERIOD/2];
#endif

   celt_sig in_mem[1]; /* Size = channels*mode->overlap */
   /* celt_sig prefilter_mem[],  Size = channels*COMBFILTER_MAXPERIOD */
   /* opus_val16 oldBandE[],     Size = channels*mode->nbEBands */
   /* opus_val16 oldLogE[],      Size = channels*mode->nbEBands */
   /* opus_val16 oldLogE2[],     Size = channels*mode->nbEBands */
};

int celt_encoder_get_size(int channels)
{
   CELTMode *mode = opus_custom_mode_create(48000, 960, NULL);
   return opus_custom_encoder_get_size(mode, channels);
}

OPUS_CUSTOM_NOSTATIC int opus_custom_encoder_get_size(const CELTMode *mode, int channels)
{
   int size = sizeof(struct CELTEncoder)
         + (channels*mode->overlap-1)*sizeof(celt_sig)    /* celt_sig in_mem[channels*mode->overlap]; */
         + channels*COMBFILTER_MAXPERIOD*sizeof(celt_sig) /* celt_sig prefilter_mem[channels*COMBFILTER_MAXPERIOD]; */
         + 3*channels*mode->nbEBands*sizeof(opus_val16);  /* opus_val16 oldBandE[channels*mode->nbEBands]; */
                                                          /* opus_val16 oldLogE[channels*mode->nbEBands]; */
                                                          /* opus_val16 oldLogE2[channels*mode->nbEBands]; */
   return size;
}

#ifdef CUSTOM_MODES
CELTEncoder *opus_custom_encoder_create(const CELTMode *mode, int channels, int *error)
{
   int ret;
   CELTEncoder *st = (CELTEncoder *)opus_alloc(opus_custom_encoder_get_size(mode, channels));
   /* init will handle the NULL case */
   ret = opus_custom_encoder_init(st, mode, channels);
   if (ret != OPUS_OK)
   {
      opus_custom_encoder_destroy(st);
      st = NULL;
   }
   if (error)
      *error = ret;
   return st;
}
#endif /* CUSTOM_MODES */

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static int opus_custom_encoder_init_arch(CELTEncoder *st, const CELTMode *mode,
                                         int channels, int arch)
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{
   if (channels < 0 || channels > 2)
      return OPUS_BAD_ARG;

   if (st==NULL || mode==NULL)
      return OPUS_ALLOC_FAIL;

   OPUS_CLEAR((char*)st, opus_custom_encoder_get_size(mode, channels));

   st->mode = mode;
   st->stream_channels = st->channels = channels;

   st->upsample = 1;
   st->start = 0;
   st->end = st->mode->effEBands;
   st->signalling = 1;

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   st->arch = arch;
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   st->constrained_vbr = 1;
   st->clip = 1;

   st->bitrate = OPUS_BITRATE_MAX;
   st->vbr = 0;
   st->force_intra  = 0;
   st->complexity = 5;
   st->lsb_depth=24;

   opus_custom_encoder_ctl(st, OPUS_RESET_STATE);

   return OPUS_OK;
}

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#ifdef CUSTOM_MODES
int opus_custom_encoder_init(CELTEncoder *st, const CELTMode *mode, int channels)
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{
   return opus_custom_encoder_init_arch(st, mode, channels, opus_select_arch());
}
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#endif
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int celt_encoder_init(CELTEncoder *st, opus_int32 sampling_rate, int channels,
                      int arch)
{
   int ret;
   ret = opus_custom_encoder_init_arch(st,
           opus_custom_mode_create(48000, 960, NULL), channels, arch);
   if (ret != OPUS_OK)
      return ret;
   st->upsample = resampling_factor(sampling_rate);
   return OPUS_OK;
}

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#ifdef CUSTOM_MODES
void opus_custom_encoder_destroy(CELTEncoder *st)
{
   opus_free(st);
}
#endif /* CUSTOM_MODES */


static int transient_analysis(const opus_val32 * OPUS_RESTRICT in, int len, int C,
                              opus_val16 *tf_estimate, int *tf_chan)
{
   int i;
   VARDECL(opus_val16, tmp);
   opus_val32 mem0,mem1;
   int is_transient = 0;
   opus_int32 mask_metric = 0;
   int c;
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   opus_val16 tf_max;
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   int len2;
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   /* Table of 6*64/x, trained on real data to minimize the average error */
   static const unsigned char inv_table[128] = {
         255,255,156,110, 86, 70, 59, 51, 45, 40, 37, 33, 31, 28, 26, 25,
          23, 22, 21, 20, 19, 18, 17, 16, 16, 15, 15, 14, 13, 13, 12, 12,
          12, 12, 11, 11, 11, 10, 10, 10,  9,  9,  9,  9,  9,  9,  8,  8,
           8,  8,  8,  7,  7,  7,  7,  7,  7,  6,  6,  6,  6,  6,  6,  6,
           6,  6,  6,  6,  6,  6,  6,  6,  6,  5,  5,  5,  5,  5,  5,  5,
           5,  5,  5,  5,  5,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,
           4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  3,  3,
           3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  2,
   };
   SAVE_STACK;
   ALLOC(tmp, len, opus_val16);

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   len2=len/2;
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   for (c=0;c<C;c++)
   {
      opus_val32 mean;
      opus_int32 unmask=0;
      opus_val32 norm;
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      opus_val16 maxE;
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      mem0=0;
      mem1=0;
      /* High-pass filter: (1 - 2*z^-1 + z^-2) / (1 - z^-1 + .5*z^-2) */
      for (i=0;i<len;i++)
      {
         opus_val32 x,y;
         x = SHR32(in[i+c*len],SIG_SHIFT);
         y = ADD32(mem0, x);
#ifdef FIXED_POINT
         mem0 = mem1 + y - SHL32(x,1);
         mem1 = x - SHR32(y,1);
#else
         mem0 = mem1 + y - 2*x;
         mem1 = x - .5f*y;
#endif
         tmp[i] = EXTRACT16(SHR32(y,2));
         /*printf("%f ", tmp[i]);*/
      }
      /*printf("\n");*/
      /* First few samples are bad because we don't propagate the memory */
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      OPUS_CLEAR(tmp, 12);
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#ifdef FIXED_POINT
      /* Normalize tmp to max range */
      {
         int shift=0;
         shift = 14-celt_ilog2(1+celt_maxabs16(tmp, len));
         if (shift!=0)
         {
            for (i=0;i<len;i++)
               tmp[i] = SHL16(tmp[i], shift);
         }
      }
#endif

      mean=0;
      mem0=0;
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      /* Grouping by two to reduce complexity */
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      /* Forward pass to compute the post-echo threshold*/
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      for (i=0;i<len2;i++)
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      {
         opus_val16 x2 = PSHR32(MULT16_16(tmp[2*i],tmp[2*i]) + MULT16_16(tmp[2*i+1],tmp[2*i+1]),16);
         mean += x2;
#ifdef FIXED_POINT
         /* FIXME: Use PSHR16() instead */
         tmp[i] = mem0 + PSHR32(x2-mem0,4);
#else
         tmp[i] = mem0 + MULT16_16_P15(QCONST16(.0625f,15),x2-mem0);
#endif
         mem0 = tmp[i];
      }

      mem0=0;
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      maxE=0;
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      /* Backward pass to compute the pre-echo threshold */
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      for (i=len2-1;i>=0;i--)
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      {
#ifdef FIXED_POINT
         /* FIXME: Use PSHR16() instead */
         tmp[i] = mem0 + PSHR32(tmp[i]-mem0,3);
#else
         tmp[i] = mem0 + MULT16_16_P15(QCONST16(0.125f,15),tmp[i]-mem0);
#endif
         mem0 = tmp[i];
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         maxE = MAX16(maxE, mem0);
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      }
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      /*for (i=0;i<len2;i++)printf("%f ", tmp[i]/mean);printf("\n");*/
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      /* Compute the ratio of the "frame energy" over the harmonic mean of the energy.
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         This essentially corresponds to a bitrate-normalized temporal noise-to-mask
         ratio */

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      /* As a compromise with the old transient detector, frame energy is the
         geometric mean of the energy and half the max */
#ifdef FIXED_POINT
      /* Costs two sqrt() to avoid overflows */
      mean = MULT16_16(celt_sqrt(mean), celt_sqrt(MULT16_16(maxE,len2>>1)));
#else
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      mean = celt_sqrt(mean * maxE*.5*len2);
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#endif
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      /* Inverse of the mean energy in Q15+6 */
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      norm = SHL32(EXTEND32(len2),6+14)/ADD32(EPSILON,SHR32(mean,1));
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      /* Compute harmonic mean discarding the unreliable boundaries
         The data is smooth, so we only take 1/4th of the samples */
      unmask=0;
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      for (i=12;i<len2-5;i+=4)
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      {
         int id;
#ifdef FIXED_POINT
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         id = MAX32(0,MIN32(127,MULT16_32_Q15(tmp[i]+EPSILON,norm))); /* Do not round to nearest */
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#else
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         id = (int)MAX32(0,MIN32(127,floor(64*norm*(tmp[i]+EPSILON)))); /* Do not round to nearest */
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#endif
         unmask += inv_table[id];
      }
      /*printf("%d\n", unmask);*/
      /* Normalize, compensate for the 1/4th of the sample and the factor of 6 in the inverse table */
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      unmask = 64*unmask*4/(6*(len2-17));
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      if (unmask>mask_metric)
      {
         *tf_chan = c;
         mask_metric = unmask;
      }
   }
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   is_transient = mask_metric>200;
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   /* Arbitrary metric for VBR boost */
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   tf_max = MAX16(0,celt_sqrt(27*mask_metric)-42);
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   /* *tf_estimate = 1 + MIN16(1, sqrt(MAX16(0, tf_max-30))/20); */
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   *tf_estimate = celt_sqrt(MAX32(0, SHL32(MULT16_16(QCONST16(0.0069,14),MIN16(163,tf_max)),14)-QCONST32(0.139,28)));
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   /*printf("%d %f\n", tf_max, mask_metric);*/
   RESTORE_STACK;
#ifdef FUZZING
   is_transient = rand()&0x1;
#endif
   /*printf("%d %f %d\n", is_transient, (float)*tf_estimate, tf_max);*/
   return is_transient;
}

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/* Looks for sudden increases of energy to decide whether we need to patch
   the transient decision */
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static int patch_transient_decision(opus_val16 *newE, opus_val16 *oldE, int nbEBands,
      int start, int end, int C)
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{
   int i, c;
   opus_val32 mean_diff=0;
   opus_val16 spread_old[26];
   /* Apply an aggressive (-6 dB/Bark) spreading function to the old frame to
      avoid false detection caused by irrelevant bands */
   if (C==1)
   {
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      spread_old[start] = oldE[start];
      for (i=start+1;i<end;i++)
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         spread_old[i] = MAX16(spread_old[i-1]-QCONST16(1.0f, DB_SHIFT), oldE[i]);
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   } else {
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      spread_old[start] = MAX16(oldE[start],oldE[start+nbEBands]);
      for (i=start+1;i<end;i++)
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         spread_old[i] = MAX16(spread_old[i-1]-QCONST16(1.0f, DB_SHIFT),
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                               MAX16(oldE[i],oldE[i+nbEBands]));
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   }
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   for (i=end-2;i>=start;i--)
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      spread_old[i] = MAX16(spread_old[i], spread_old[i+1]-QCONST16(1.0f, DB_SHIFT));
   /* Compute mean increase */
   c=0; do {
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      for (i=IMAX(2,start);i<end-1;i++)
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      {
         opus_val16 x1, x2;
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         x1 = MAX16(0, newE[i + c*nbEBands]);
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         x2 = MAX16(0, spread_old[i]);
         mean_diff = ADD32(mean_diff, EXTEND32(MAX16(0, SUB16(x1, x2))));
      }
   } while (++c<C);
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   mean_diff = DIV32(mean_diff, C*(end-1-IMAX(2,start)));
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   /*printf("%f %f %d\n", mean_diff, max_diff, count);*/
   return mean_diff > QCONST16(1.f, DB_SHIFT);
}

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/** Apply window and compute the MDCT for all sub-frames and
    all channels in a frame */
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static void compute_mdcts(const CELTMode *mode, int shortBlocks, celt_sig * OPUS_RESTRICT in,
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                          celt_sig * OPUS_RESTRICT out, int C, int CC, int LM, int upsample,
                          int arch)
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{
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   const int overlap = mode->overlap;
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   int N;
   int B;
   int shift;
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   int i, b, c;
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   if (shortBlocks)
   {
      B = shortBlocks;
      N = mode->shortMdctSize;
      shift = mode->maxLM;
   } else {
      B = 1;
      N = mode->shortMdctSize<<LM;
      shift = mode->maxLM-LM;
   }
   c=0; do {
      for (b=0;b<B;b++)
      {
         /* Interleaving the sub-frames while doing the MDCTs */
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         clt_mdct_forward(&mode->mdct, in+c*(B*N+overlap)+b*N,
                          &out[b+c*N*B], mode->window, overlap, shift, B,
                          arch);
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      }
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   } while (++c<CC);
   if (CC==2&&C==1)
   {
      for (i=0;i<B*N;i++)
         out[i] = ADD32(HALF32(out[i]), HALF32(out[B*N+i]));
   }
   if (upsample != 1)
   {
      c=0; do
      {
         int bound = B*N/upsample;
         for (i=0;i<bound;i++)
            out[c*B*N+i] *= upsample;
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         OPUS_CLEAR(&out[c*B*N+bound], B*N-bound);
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      } while (++c<C);
   }
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}


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void celt_preemphasis(const opus_val16 * OPUS_RESTRICT pcmp, celt_sig * OPUS_RESTRICT inp,
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                        int N, int CC, int upsample, const opus_val16 *coef, celt_sig *mem, int clip)
{
   int i;
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   opus_val16 coef0;
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   celt_sig m;
   int Nu;

   coef0 = coef[0];
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   m = *mem;
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   /* Fast path for the normal 48kHz case and no clipping */
   if (coef[1] == 0 && upsample == 1 && !clip)
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   {
      for (i=0;i<N;i++)
      {
         opus_val16 x;
         x = SCALEIN(pcmp[CC*i]);
         /* Apply pre-emphasis */
         inp[i] = SHL32(x, SIG_SHIFT) - m;
         m = SHR32(MULT16_16(coef0, x), 15-SIG_SHIFT);
      }
      *mem = m;
      return;
   }
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   Nu = N/upsample;
   if (upsample!=1)
   {
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      OPUS_CLEAR(inp, N);
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   }
   for (i=0;i<Nu;i++)
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      inp[i*upsample] = SCALEIN(pcmp[CC*i]);
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#ifndef FIXED_POINT
   if (clip)
   {
      /* Clip input to avoid encoding non-portable files */
      for (i=0;i<Nu;i++)
         inp[i*upsample] = MAX32(-65536.f, MIN32(65536.f,inp[i*upsample]));
   }
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#else
   (void)clip; /* Avoids a warning about clip being unused. */
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#endif
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#ifdef CUSTOM_MODES
   if (coef[1] != 0)
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   {
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      opus_val16 coef1 = coef[1];
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      opus_val16 coef2 = coef[2];
      for (i=0;i<N;i++)
      {
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         celt_sig x, tmp;
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         x = inp[i];
         /* Apply pre-emphasis */
         tmp = MULT16_16(coef2, x);
         inp[i] = tmp + m;
         m = MULT16_32_Q15(coef1, inp[i]) - MULT16_32_Q15(coef0, tmp);
      }
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   } else
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#endif
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   {
      for (i=0;i<N;i++)
      {
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         opus_val16 x;
         x = inp[i];
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         /* Apply pre-emphasis */
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         inp[i] = SHL32(x, SIG_SHIFT) - m;
         m = SHR32(MULT16_16(coef0, x), 15-SIG_SHIFT);
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      }
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   }
   *mem = m;
}



static opus_val32 l1_metric(const celt_norm *tmp, int N, int LM, opus_val16 bias)
{
   int i;
   opus_val32 L1;
   L1 = 0;
   for (i=0;i<N;i++)
      L1 += EXTEND32(ABS16(tmp[i]));
   /* When in doubt, prefer good freq resolution */
   L1 = MAC16_32_Q15(L1, LM*bias, L1);
   return L1;

}

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static int tf_analysis(const CELTMode *m, int len, int isTransient,
      int *tf_res, int lambda, celt_norm *X, int N0, int LM,
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      opus_val16 tf_estimate, int tf_chan)
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{
   int i;
   VARDECL(int, metric);
   int cost0;
   int cost1;
   VARDECL(int, path0);
   VARDECL(int, path1);
   VARDECL(celt_norm, tmp);
   VARDECL(celt_norm, tmp_1);
   int sel;
   int selcost[2];
   int tf_select=0;
   opus_val16 bias;

   SAVE_STACK;
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   bias = MULT16_16_Q14(QCONST16(.04f,15), MAX16(-QCONST16(.25f,14), QCONST16(.5f,14)-tf_estimate));
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   /*printf("%f ", bias);*/

   ALLOC(metric, len, int);
   ALLOC(tmp, (m->eBands[len]-m->eBands[len-1])<<LM, celt_norm);
   ALLOC(tmp_1, (m->eBands[len]-m->eBands[len-1])<<LM, celt_norm);
   ALLOC(path0, len, int);
   ALLOC(path1, len, int);

   for (i=0;i<len;i++)
   {
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      int k, N;
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      int narrow;
      opus_val32 L1, best_L1;
      int best_level=0;
      N = (m->eBands[i+1]-m->eBands[i])<<LM;
      /* band is too narrow to be split down to LM=-1 */
      narrow = (m->eBands[i+1]-m->eBands[i])==1;
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      OPUS_COPY(tmp, &X[tf_chan*N0 + (m->eBands[i]<<LM)], N);
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      /* Just add the right channel if we're in stereo */
      /*if (C==2)
         for (j=0;j<N;j++)
            tmp[j] = ADD16(SHR16(tmp[j], 1),SHR16(X[N0+j+(m->eBands[i]<<LM)], 1));*/
      L1 = l1_metric(tmp, N, isTransient ? LM : 0, bias);
      best_L1 = L1;
      /* Check the -1 case for transients */
      if (isTransient && !narrow)
      {
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         OPUS_COPY(tmp_1, tmp, N);
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         haar1(tmp_1, N>>LM, 1<<LM);
         L1 = l1_metric(tmp_1, N, LM+1, bias);
         if (L1<best_L1)
         {
            best_L1 = L1;
            best_level = -1;
         }
      }
      /*printf ("%f ", L1);*/
      for (k=0;k<LM+!(isTransient||narrow);k++)
      {
         int B;

         if (isTransient)
            B = (LM-k-1);
         else
            B = k+1;

         haar1(tmp, N>>k, 1<<k);

         L1 = l1_metric(tmp, N, B, bias);

         if (L1 < best_L1)
         {
            best_L1 = L1;
            best_level = k+1;
         }
      }
      /*printf ("%d ", isTransient ? LM-best_level : best_level);*/
      /* metric is in Q1 to be able to select the mid-point (-0.5) for narrower bands */
      if (isTransient)
         metric[i] = 2*best_level;
      else
         metric[i] = -2*best_level;
      /* For bands that can't be split to -1, set the metric to the half-way point to avoid
         biasing the decision */
      if (narrow && (metric[i]==0 || metric[i]==-2*LM))
         metric[i]-=1;
      /*printf("%d ", metric[i]);*/
   }
   /*printf("\n");*/
   /* Search for the optimal tf resolution, including tf_select */
   tf_select = 0;
   for (sel=0;sel<2;sel++)
   {
      cost0 = 0;
      cost1 = isTransient ? 0 : lambda;
      for (i=1;i<len;i++)
      {
         int curr0, curr1;
         curr0 = IMIN(cost0, cost1 + lambda);
         curr1 = IMIN(cost0 + lambda, cost1);
         cost0 = curr0 + abs(metric[i]-2*tf_select_table[LM][4*isTransient+2*sel+0]);
         cost1 = curr1 + abs(metric[i]-2*tf_select_table[LM][4*isTransient+2*sel+1]);
      }
      cost0 = IMIN(cost0, cost1);
      selcost[sel]=cost0;
   }
   /* For now, we're conservative and only allow tf_select=1 for transients.
    * If tests confirm it's useful for non-transients, we could allow it. */
   if (selcost[1]<selcost[0] && isTransient)
      tf_select=1;
   cost0 = 0;
   cost1 = isTransient ? 0 : lambda;
   /* Viterbi forward pass */
   for (i=1;i<len;i++)
   {
      int curr0, curr1;
      int from0, from1;

      from0 = cost0;
      from1 = cost1 + lambda;
      if (from0 < from1)
      {
         curr0 = from0;
         path0[i]= 0;
      } else {
         curr0 = from1;
         path0[i]= 1;
      }

      from0 = cost0 + lambda;
      from1 = cost1;
      if (from0 < from1)
      {
         curr1 = from0;
         path1[i]= 0;
      } else {
         curr1 = from1;
         path1[i]= 1;
      }
      cost0 = curr0 + abs(metric[i]-2*tf_select_table[LM][4*isTransient+2*tf_select+0]);
      cost1 = curr1 + abs(metric[i]-2*tf_select_table[LM][4*isTransient+2*tf_select+1]);
   }
   tf_res[len-1] = cost0 < cost1 ? 0 : 1;
   /* Viterbi backward pass to check the decisions */
   for (i=len-2;i>=0;i--)
   {
      if (tf_res[i+1] == 1)
         tf_res[i] = path1[i+1];
      else
         tf_res[i] = path0[i+1];
   }
   /*printf("%d %f\n", *tf_sum, tf_estimate);*/
   RESTORE_STACK;
#ifdef FUZZING
   tf_select = rand()&0x1;
   tf_res[0] = rand()&0x1;
   for (i=1;i<len;i++)
      tf_res[i] = tf_res[i-1] ^ ((rand()&0xF) == 0);
#endif
   return tf_select;
}

static void tf_encode(int start, int end, int isTransient, int *tf_res, int LM, int tf_select, ec_enc *enc)
{
   int curr, i;
   int tf_select_rsv;
   int tf_changed;
   int logp;
   opus_uint32 budget;
   opus_uint32 tell;
   budget = enc->storage*8;
   tell = ec_tell(enc);
   logp = isTransient ? 2 : 4;
   /* Reserve space to code the tf_select decision. */
   tf_select_rsv = LM>0 && tell+logp+1 <= budget;
   budget -= tf_select_rsv;
   curr = tf_changed = 0;
   for (i=start;i<end;i++)
   {
      if (tell+logp<=budget)
      {
         ec_enc_bit_logp(enc, tf_res[i] ^ curr, logp);
         tell = ec_tell(enc);
         curr = tf_res[i];
         tf_changed |= curr;
      }
      else
         tf_res[i] = curr;
      logp = isTransient ? 4 : 5;
   }
   /* Only code tf_select if it would actually make a difference. */
   if (tf_select_rsv &&
         tf_select_table[LM][4*isTransient+0+tf_changed]!=
         tf_select_table[LM][4*isTransient+2+tf_changed])
      ec_enc_bit_logp(enc, tf_select, 1);
   else
      tf_select = 0;
   for (i=start;i<end;i++)
      tf_res[i] = tf_select_table[LM][4*isTransient+2*tf_select+tf_res[i]];
   /*for(i=0;i<end;i++)printf("%d ", isTransient ? tf_res[i] : LM+tf_res[i]);printf("\n");*/
}


static int alloc_trim_analysis(const CELTMode *m, const celt_norm *X,
      const opus_val16 *bandLogE, int end, int LM, int C, int N0,
      AnalysisInfo *analysis, opus_val16 *stereo_saving, opus_val16 tf_estimate,
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      int intensity, opus_val16 surround_trim, int arch)
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{
   int i;
   opus_val32 diff=0;
   int c;
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   int trim_index;
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   opus_val16 trim = QCONST16(5.f, 8);
   opus_val16 logXC, logXC2;
   if (C==2)
   {
      opus_val16 sum = 0; /* Q10 */
      opus_val16 minXC; /* Q10 */
      /* Compute inter-channel correlation for low frequencies */
      for (i=0;i<8;i++)
      {
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         opus_val32 partial;
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         partial = celt_inner_prod(&X[m->eBands[i]<<LM], &X[N0+(m->eBands[i]<<LM)],
               (m->eBands[i+1]-m->eBands[i])<<LM, arch);
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         sum = ADD16(sum, EXTRACT16(SHR32(partial, 18)));
      }
      sum = MULT16_16_Q15(QCONST16(1.f/8, 15), sum);
      sum = MIN16(QCONST16(1.f, 10), ABS16(sum));
      minXC = sum;
      for (i=8;i<intensity;i++)
      {
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         opus_val32 partial;
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         partial = celt_inner_prod(&X[m->eBands[i]<<LM], &X[N0+(m->eBands[i]<<LM)],
               (m->eBands[i+1]-m->eBands[i])<<LM, arch);
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         minXC = MIN16(minXC, ABS16(EXTRACT16(SHR32(partial, 18))));
      }
      minXC = MIN16(QCONST16(1.f, 10), ABS16(minXC));
      /*printf ("%f\n", sum);*/
      /* mid-side savings estimations based on the LF average*/
      logXC = celt_log2(QCONST32(1.001f, 20)-MULT16_16(sum, sum));
      /* mid-side savings estimations based on min correlation */
      logXC2 = MAX16(HALF16(logXC), celt_log2(QCONST32(1.001f, 20)-MULT16_16(minXC, minXC)));
#ifdef FIXED_POINT
      /* Compensate for Q20 vs Q14 input and convert output to Q8 */
      logXC = PSHR32(logXC-QCONST16(6.f, DB_SHIFT),DB_SHIFT-8);
      logXC2 = PSHR32(logXC2-QCONST16(6.f, DB_SHIFT),DB_SHIFT-8);
#endif

      trim += MAX16(-QCONST16(4.f, 8), MULT16_16_Q15(QCONST16(.75f,15),logXC));
      *stereo_saving = MIN16(*stereo_saving + QCONST16(0.25f, 8), -HALF16(logXC2));
   }

   /* Estimate spectral tilt */
   c=0; do {
      for (i=0;i<end-1;i++)
      {
         diff += bandLogE[i+c*m->nbEBands]*(opus_int32)(2+2*i-end);
      }
   } while (++c<C);
   diff /= C*(end-1);
   /*printf("%f\n", diff);*/
   trim -= MAX16(-QCONST16(2.f, 8), MIN16(QCONST16(2.f, 8), SHR16(diff+QCONST16(1.f, DB_SHIFT),DB_SHIFT-8)/6 ));
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   trim -= SHR16(surround_trim, DB_SHIFT-8);
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   trim -= 2*SHR16(tf_estimate, 14-8);
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#ifndef DISABLE_FLOAT_API
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   if (analysis->valid)
   {
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      trim -= MAX16(-QCONST16(2.f, 8), MIN16(QCONST16(2.f, 8),
            (opus_val16)(QCONST16(2.f, 8)*(analysis->tonality_slope+.05f))));
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   }
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#else
   (void)analysis;
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#endif

#ifdef FIXED_POINT
   trim_index = PSHR32(trim, 8);
#else
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   trim_index = (int)floor(.5f+trim);
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#endif
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   trim_index = IMAX(0, IMIN(10, trim_index));
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   /*printf("%d\n", trim_index);*/
#ifdef FUZZING
   trim_index = rand()%11;
#endif
   return trim_index;
}

static int stereo_analysis(const CELTMode *m, const celt_norm *X,
      int LM, int N0)
{
   int i;
   int thetas;
   opus_val32 sumLR = EPSILON, sumMS = EPSILON;

   /* Use the L1 norm to model the entropy of the L/R signal vs the M/S signal */
   for (i=0;i<13;i++)
   {
      int j;
      for (j=m->eBands[i]<<LM;j<m->eBands[i+1]<<LM;j++)
      {
         opus_val32 L, R, M, S;
         /* We cast to 32-bit first because of the -32768 case */
         L = EXTEND32(X[j]);
         R = EXTEND32(X[N0+j]);
         M = ADD32(L, R);
         S = SUB32(L, R);
         sumLR = ADD32(sumLR, ADD32(ABS32(L), ABS32(R)));
         sumMS = ADD32(sumMS, ADD32(ABS32(M), ABS32(S)));
      }
   }
   sumMS = MULT16_32_Q15(QCONST16(0.707107f, 15), sumMS);
   thetas = 13;
   /* We don't need thetas for lower bands with LM<=1 */
   if (LM<=1)
      thetas -= 8;
   return MULT16_32_Q15((m->eBands[13]<<(LM+1))+thetas, sumMS)
         > MULT16_32_Q15(m->eBands[13]<<(LM+1), sumLR);
}

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#define MSWAP(a,b) do {opus_val16 tmp = a;a=b;b=tmp;} while(0)
static opus_val16 median_of_5(const opus_val16 *x)
{
   opus_val16 t0, t1, t2, t3, t4;
   t2 = x[2];
   if (x[0] > x[1])
   {
      t0 = x[1];
      t1 = x[0];
   } else {
      t0 = x[0];
      t1 = x[1];
   }
   if (x[3] > x[4])
   {
      t3 = x[4];
      t4 = x[3];
   } else {
      t3 = x[3];
      t4 = x[4];
   }
   if (t0 > t3)
   {
      MSWAP(t0, t3);
      MSWAP(t1, t4);
   }
   if (t2 > t1)
   {
      if (t1 < t3)
         return MIN16(t2, t3);
      else
         return MIN16(t4, t1);
   } else {
      if (t2 < t3)
         return MIN16(t1, t3);
      else
         return MIN16(t2, t4);
   }
}

static opus_val16 median_of_3(const opus_val16 *x)
{
   opus_val16 t0, t1, t2;
   if (x[0] > x[1])
   {
      t0 = x[1];
      t1 = x[0];
   } else {
      t0 = x[0];
      t1 = x[1];
   }
   t2 = x[2];
   if (t1 < t2)
      return t1;
   else if (t0 < t2)
      return t2;
   else
      return t0;
}

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static opus_val16 dynalloc_analysis(const opus_val16 *bandLogE, const opus_val16 *bandLogE2,
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      int nbEBands, int start, int end, int C, int *offsets, int lsb_depth, const opus_int16 *logN,
      int isTransient, int vbr, int constrained_vbr, const opus_int16 *eBands, int LM,
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      int effectiveBytes, opus_int32 *tot_boost_, int lfe, opus_val16 *surround_dynalloc)
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{
   int i, c;
   opus_int32 tot_boost=0;
   opus_val16 maxDepth;
   VARDECL(opus_val16, follower);
   VARDECL(opus_val16, noise_floor);
   SAVE_STACK;
   ALLOC(follower, C*nbEBands, opus_val16);
   ALLOC(noise_floor, C*nbEBands, opus_val16);
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   OPUS_CLEAR(offsets, nbEBands);
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   /* Dynamic allocation code */
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   maxDepth=-QCONST16(31.9f, DB_SHIFT);
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   for (i=0;i<end;i++)
   {
      /* Noise floor must take into account eMeans, the depth, the width of the bands
         and the preemphasis filter (approx. square of bark band ID) */
      noise_floor[i] = MULT16_16(QCONST16(0.0625f, DB_SHIFT),logN[i])
            +QCONST16(.5f,DB_SHIFT)+SHL16(9-lsb_depth,DB_SHIFT)-SHL16(eMeans[i],6)
            +MULT16_16(QCONST16(.0062,DB_SHIFT),(i+5)*(i+5));
   }
   c=0;do
   {
      for (i=0;i<end;i++)
         maxDepth = MAX16(maxDepth, bandLogE[c*nbEBands+i]-noise_floor[i]);
   } while (++c<C);
   /* Make sure that dynamic allocation can't make us bust the budget */
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   if (effectiveBytes > 50 && LM>=1 && !lfe)
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   {
      int last=0;
      c=0;do
      {
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         opus_val16 offset;
         opus_val16 tmp;
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         opus_val16 *f;
         f = &follower[c*nbEBands];
         f[0] = bandLogE2[c*nbEBands];
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         for (i=1;i<end;i++)
         {
            /* The last band to be at least 3 dB higher than the previous one
               is the last we'll consider. Otherwise, we run into problems on
               bandlimited signals. */
            if (bandLogE2[c*nbEBands+i] > bandLogE2[c*nbEBands+i-1]+QCONST16(.5f,DB_SHIFT))
               last=i;
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            f[i] = MIN16(f[i-1]+QCONST16(1.5f,DB_SHIFT), bandLogE2[c*nbEBands+i]);
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         }
         for (i=last-1;i>=0;i--)
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            f[i] = MIN16(f[i], MIN16(f[i+1]+QCONST16(2.f,DB_SHIFT), bandLogE2[c*nbEBands+i]));
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         /* Combine with a median filter to avoid dynalloc triggering unnecessarily.
            The "offset" value controls how conservative we are -- a higher offset
            reduces the impact of the median filter and makes dynalloc use more bits. */
         offset = QCONST16(1.f, DB_SHIFT);
         for (i=2;i<end-2;i++)
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            f[i] = MAX16(f[i], median_of_5(&bandLogE2[c*nbEBands+i-2])-offset);
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         tmp = median_of_3(&bandLogE2[c*nbEBands])-offset;
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         f[0] = MAX16(f[0], tmp);
         f[1] = MAX16(f[1], tmp);
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         tmp = median_of_3(&bandLogE2[c*nbEBands+end-3])-offset;
         f[end-2] = MAX16(f[end-2], tmp);
         f[end-1] = MAX16(f[end-1], tmp);
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         for (i=0;i<end;i++)
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            f[i] = MAX16(f[i], noise_floor[i]);
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      } while (++c<C);
      if (C==2)
      {
         for (i=start;i<end;i++)
         {
            /* Consider 24 dB "cross-talk" */
            follower[nbEBands+i] = MAX16(follower[nbEBands+i], follower[         i]-QCONST16(4.f,DB_SHIFT));
            follower[         i] = MAX16(follower[         i], follower[nbEBands+i]-QCONST16(4.f,DB_SHIFT));
            follower[i] = HALF16(MAX16(0, bandLogE[i]-follower[i]) + MAX16(0, bandLogE[nbEBands+i]-follower[nbEBands+i]));
         }
      } else {
         for (i=start;i<end;i++)
         {
            follower[i] = MAX16(0, bandLogE[i]-follower[i]);
         }
      }
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      for (i=start;i<end;i++)
         follower[i] = MAX16(follower[i], surround_dynalloc[i]);
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      /* For non-transient CBR/CVBR frames, halve the dynalloc contribution */
      if ((!vbr || constrained_vbr)&&!isTransient)
      {
         for (i=start;i<end;i++)
            follower[i] = HALF16(follower[i]);
      }
      for (i=start;i<end;i++)
      {
         int width;
         int boost;
         int boost_bits;

         if (i<8)
            follower[i] *= 2;
         if (i>=12)
            follower[i] = HALF16(follower[i]);
         follower[i] = MIN16(follower[i], QCONST16(4, DB_SHIFT));

         width = C*(eBands[i+1]-eBands[i])<<LM;
         if (width<6)
         {
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            boost = (int)SHR32(EXTEND32(follower[i]),DB_SHIFT);
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            boost_bits = boost*width<<BITRES;
         } else if (width > 48) {
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            boost = (int)SHR32(EXTEND32(follower[i])*8,DB_SHIFT);
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            boost_bits = (boost*width<<BITRES)/8;
         } else {
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            boost = (int)SHR32(EXTEND32(follower[i])*width/6,DB_SHIFT);
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            boost_bits = boost*6<<BITRES;
         }
         /* For CBR and non-transient CVBR frames, limit dynalloc to 1/4 of the bits */
         if ((!vbr || (constrained_vbr&&!isTransient))
               && (tot_boost+boost_bits)>>BITRES>>3 > effectiveBytes/4)
         {
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            opus_int32 cap = ((effectiveBytes/4)<<BITRES<<3);
            offsets[i] = cap-tot_boost;
            tot_boost = cap;
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            break;
         } else {
            offsets[i] = boost;
            tot_boost += boost_bits;
         }
      }
   }
   *tot_boost_ = tot_boost;
   RESTORE_STACK;
   return maxDepth;
}


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static int run_prefilter(CELTEncoder *st, celt_sig *in, celt_sig *prefilter_mem, int CC, int N,
      int prefilter_tapset, int *pitch, opus_val16 *gain, int *qgain, int enabled, int nbAvailableBytes)
{
   int c;
   VARDECL(celt_sig, _pre);
   celt_sig *pre[2];
   const CELTMode *mode;
   int pitch_index;
   opus_val16 gain1;
   opus_val16 pf_threshold;
   int pf_on;
   int qg;
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   int overlap;
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   SAVE_STACK;

   mode = st->mode;
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   overlap = mode->overlap;
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   ALLOC(_pre, CC*(N+COMBFILTER_MAXPERIOD), celt_sig);

   pre[0] = _pre;
   pre[1] = _pre + (N+COMBFILTER_MAXPERIOD);


   c=0; do {
      OPUS_COPY(pre[c], prefilter_mem+c*COMBFILTER_MAXPERIOD, COMBFILTER_MAXPERIOD);
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      OPUS_COPY(pre[c]+COMBFILTER_MAXPERIOD, in+c*(N+overlap)+overlap, N);
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   } while (++c<CC);

   if (enabled)
   {
      VARDECL(opus_val16, pitch_buf);
      ALLOC(pitch_buf, (COMBFILTER_MAXPERIOD+N)>>1, opus_val16);

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      pitch_downsample(pre, pitch_buf, COMBFILTER_MAXPERIOD+N, CC, st->arch);
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      /* Don't search for the fir last 1.5 octave of the range because
         there's too many false-positives due to short-term correlation */
      pitch_search(pitch_buf+(COMBFILTER_MAXPERIOD>>1), pitch_buf, N,
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            COMBFILTER_MAXPERIOD-3*COMBFILTER_MINPERIOD, &pitch_index,
            st->arch);
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      pitch_index = COMBFILTER_MAXPERIOD-pitch_index;

      gain1 = remove_doubling(pitch_buf, COMBFILTER_MAXPERIOD, COMBFILTER_MINPERIOD,
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            N, &pitch_index, st->prefilter_period, st->prefilter_gain, st->arch);
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      if (pitch_index > COMBFILTER_MAXPERIOD-2)
         pitch_index = COMBFILTER_MAXPERIOD-2;
      gain1 = MULT16_16_Q15(QCONST16(.7f,15),gain1);
      /*printf("%d %d %f %f\n", pitch_change, pitch_index, gain1, st->analysis.tonality);*/
      if (st->loss_rate>2)
         gain1 = HALF32(gain1);
      if (st->loss_rate>4)
         gain1 = HALF32(gain1);
      if (st->loss_rate>8)
         gain1 = 0;
   } else {
      gain1 = 0;
      pitch_index = COMBFILTER_MINPERIOD;
   }

   /* Gain threshold for enabling the prefilter/postfilter */
   pf_threshold = QCONST16(.2f,15);

   /* Adjusting the threshold based on rate and continuity */
   if (abs(pitch_index-st->prefilter_period)*10>pitch_index)
      pf_threshold += QCONST16(.2f,15);
   if (nbAvailableBytes<25)
      pf_threshold += QCONST16(.1f,15);
   if (nbAvailableBytes<35)
      pf_threshold += QCONST16(.1f,15);
   if (st->prefilter_gain > QCONST16(.4f,15))
      pf_threshold -= QCONST16(.1f,15);
   if (st->prefilter_gain > QCONST16(.55f,15))
      pf_threshold -= QCONST16(.1f,15);

   /* Hard threshold at 0.2 */
   pf_threshold = MAX16(pf_threshold, QCONST16(.2f,15));
   if (gain1<pf_threshold)
   {
      gain1 = 0;
      pf_on = 0;
      qg = 0;
   } else {
      /*This block is not gated by a total bits check only because
        of the nbAvailableBytes check above.*/
      if (ABS16(gain1-st->prefilter_gain)<QCONST16(.1f,15))
         gain1=st->prefilter_gain;

#ifdef FIXED_POINT
      qg = ((gain1+1536)>>10)/3-1;
#else
      qg = (int)floor(.5f+gain1*32/3)-1;
#endif
      qg = IMAX(0, IMIN(7, qg));
      gain1 = QCONST16(0.09375f,15)*(qg+1);
      pf_on = 1;
   }
   /*printf("%d %f\n", pitch_index, gain1);*/

   c=0; do {
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      int offset = mode->shortMdctSize-overlap;
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      st->prefilter_period=IMAX(st->prefilter_period, COMBFILTER_MINPERIOD);
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      OPUS_COPY(in+c*(N+overlap), st->in_mem+c*(overlap), overlap);
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      if (offset)
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         comb_filter(in+c*(N+overlap)+overlap, pre[c]+COMBFILTER_MAXPERIOD,
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               st->prefilter_period, st->prefilter_period, offset, -st->prefilter_gain, -st->prefilter_gain,
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               st->prefilter_tapset, st->prefilter_tapset, NULL, 0, st->arch);
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      comb_filter(in+c*(N+overlap)+overlap+offset, pre[c]+COMBFILTER_MAXPERIOD+offset,
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            st->prefilter_period, pitch_index, N-offset, -st->prefilter_gain, -gain1,
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            st->prefilter_tapset, prefilter_tapset, mode->window, overlap, st->arch);
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      OPUS_COPY(st->in_mem+c*(overlap), in+c*(N+overlap)+N, overlap);
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      if (N>COMBFILTER_MAXPERIOD)
      {
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         OPUS_COPY(prefilter_mem+c*COMBFILTER_MAXPERIOD, pre[c]+N, COMBFILTER_MAXPERIOD);
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      } else {
         OPUS_MOVE(prefilter_mem+c*COMBFILTER_MAXPERIOD, prefilter_mem+c*COMBFILTER_MAXPERIOD+N, COMBFILTER_MAXPERIOD-N);
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         OPUS_COPY(prefilter_mem+c*COMBFILTER_MAXPERIOD+COMBFILTER_MAXPERIOD-N, pre[c]+COMBFILTER_MAXPERIOD, N);
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      }
   } while (++c<CC);

   RESTORE_STACK;
   *gain = gain1;
   *pitch = pitch_index;
   *qgain = qg;
   return pf_on;
}

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static int compute_vbr(const CELTMode *mode, AnalysisInfo *analysis, opus_int32 base_target,
      int LM, opus_int32 bitrate, int lastCodedBands, int C, int intensity,
      int constrained_vbr, opus_val16 stereo_saving, int tot_boost,
      opus_val16 tf_estimate, int pitch_change, opus_val16 maxDepth,
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      int variable_duration, int lfe, int has_surround_mask, opus_val16 surround_masking,
      opus_val16 temporal_vbr)
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{
   /* The target rate in 8th bits per frame */
   opus_int32 target;
   int coded_bins;
   int coded_bands;
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   opus_val16 tf_calibration;
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   int nbEBands;
   const opus_int16 *eBands;

   nbEBands = mode->nbEBands;
   eBands = mode->eBands;

   coded_bands = lastCodedBands ? lastCodedBands : nbEBands;
   coded_bins = eBands[coded_bands]<<LM;
   if (C==2)
      coded_bins += eBands[IMIN(intensity, coded_bands)]<<LM;

   target = base_target;

   /*printf("%f %f %f %f %d %d ", st->analysis.activity, st->analysis.tonality, tf_estimate, st->stereo_saving, tot_boost, coded_bands);*/
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#ifndef DISABLE_FLOAT_API
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   if (analysis->valid && analysis->activity<.4)
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      target -= (opus_int32)((coded_bins<<BITRES)*(.4f-analysis->activity));
#endif
   /* Stereo savings */
   if (C==2)
   {
      int coded_stereo_bands;
      int coded_stereo_dof;
      opus_val16 max_frac;
      coded_stereo_bands = IMIN(intensity, coded_bands);
      coded_stereo_dof = (eBands[coded_stereo_bands]<<LM)-coded_stereo_bands;
      /* Maximum fraction of the bits we can save if the signal is mono. */
      max_frac = DIV32_16(MULT16_16(QCONST16(0.8f, 15), coded_stereo_dof), coded_bins);
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      stereo_saving = MIN16(stereo_saving, QCONST16(1.f, 8));
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      /*printf("%d %d %d ", coded_stereo_dof, coded_bins, tot_boost);*/
      target -= (opus_int32)MIN32(MULT16_32_Q15(max_frac,target),
                      SHR32(MULT16_16(stereo_saving-QCONST16(0.1f,8),(coded_stereo_dof<<BITRES)),8));
   }
   /* Boost the rate according to dynalloc (minus the dynalloc average for calibration). */
   target += tot_boost-(16<<LM);
   /* Apply transient boost, compensating for average boost. */
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   tf_calibration = variable_duration==OPUS_FRAMESIZE_VARIABLE ?
                    QCONST16(0.02f,14) : QCONST16(0.04f,14);
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   target += (opus_int32)SHL32(MULT16_32_Q15(tf_estimate-tf_calibration, target),1);

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#ifndef DISABLE_FLOAT_API
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