/* Copyright (C) 2002-2006 Jean-Marc Valin

   File: sb_celp.c

   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.

   - Neither the name of the Xiph.org Foundation nor the names of its

   contributors may be used to endorse or promote products derived from

   this software without specific prior written permission.

   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 FOUNDATION 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 <math.h>

#include "sb_celp.h"

#include "filters.h"

#include "lpc.h"

#include "lsp.h"

#include "stack_alloc.h"

#include "cb_search.h"

#include "quant_lsp.h"

#include "vq.h"

#include "ltp.h"

#include "arch.h"

#include "math_approx.h"

#include "os_support.h"

#ifndef NULL

#define NULL 0

#endif

/* Default size for the encoder and decoder stack (can be changed at compile time).

   This does not apply when using variable-size arrays or alloca. */

#ifndef SB_ENC_STACK

#define SB_ENC_STACK (10000*sizeof(spx_sig_t))

#endif

#ifndef SB_DEC_STACK

#define SB_DEC_STACK (6000*sizeof(spx_sig_t))

#endif

#ifndef DISABLE_WIDEBAND

#define SUBMODE(x) st->submodes[st->submodeID]->x

#ifdef FIXED_POINT

static const spx_word16_t gc_quant_bound[16] = {125, 164, 215, 282, 370, 484, 635, 832, 1090, 1428, 1871, 2452, 3213, 4210, 5516, 7228};

static const spx_word16_t fold_quant_bound[32] = {

   39, 44, 50, 57, 64, 73, 83, 94,

   106, 120, 136, 154, 175, 198, 225, 255,

   288, 327, 370, 420, 476, 539, 611, 692,

   784, 889, 1007, 1141, 1293, 1465, 1660, 1881};

#define LSP_MARGIN 410

#define LSP_DELTA1 6553

#define LSP_DELTA2 1638

#else

static const spx_word16_t gc_quant_bound[16] = {

      0.97979, 1.28384, 1.68223, 2.20426, 2.88829, 3.78458, 4.95900, 6.49787,

      8.51428, 11.15642, 14.61846, 19.15484, 25.09895, 32.88761, 43.09325, 56.46588};

static const spx_word16_t fold_quant_bound[32] = {

   0.30498, 0.34559, 0.39161, 0.44375, 0.50283, 0.56979, 0.64565, 0.73162,

   0.82903, 0.93942, 1.06450, 1.20624, 1.36685, 1.54884, 1.75506, 1.98875,

   2.25355, 2.55360, 2.89361, 3.27889, 3.71547, 4.21018, 4.77076, 5.40598,

   6.12577, 6.94141, 7.86565, 8.91295, 10.09969, 11.44445, 12.96826, 14.69497};

#define LSP_MARGIN .05

#define LSP_DELTA1 .2

#define LSP_DELTA2 .05

#endif

#define QMF_ORDER 64

#ifdef FIXED_POINT

static const spx_word16_t h0[64] = {2, -7, -7, 18, 15, -39, -25, 75, 35, -130, -41, 212, 38, -327, -17, 483, -32, -689, 124, 956, -283, -1307, 543, 1780, -973, -2467, 1733, 3633, -3339, -6409, 9059, 30153, 30153, 9059, -6409, -3339, 3633, 1733, -2467, -973, 1780, 543, -1307, -283, 956, 124, -689, -32, 483, -17, -327, 38, 212, -41, -130, 35, 75, -25, -39, 15, 18, -7, -7, 2};

#else

static const float h0[64] = {

   3.596189e-05f, -0.0001123515f,

   -0.0001104587f, 0.0002790277f,

   0.0002298438f, -0.0005953563f,

   -0.0003823631f, 0.00113826f,

   0.0005308539f, -0.001986177f,

   -0.0006243724f, 0.003235877f,

   0.0005743159f, -0.004989147f,

   -0.0002584767f, 0.007367171f,

   -0.0004857935f, -0.01050689f,

   0.001894714f, 0.01459396f,

   -0.004313674f, -0.01994365f,

   0.00828756f, 0.02716055f,

   -0.01485397f, -0.03764973f,

   0.026447f, 0.05543245f,

   -0.05095487f, -0.09779096f,

   0.1382363f, 0.4600981f,

   0.4600981f, 0.1382363f,

   -0.09779096f, -0.05095487f,

   0.05543245f, 0.026447f,

   -0.03764973f, -0.01485397f,

   0.02716055f, 0.00828756f,

   -0.01994365f, -0.004313674f,

   0.01459396f, 0.001894714f,

   -0.01050689f, -0.0004857935f,

   0.007367171f, -0.0002584767f,

   -0.004989147f, 0.0005743159f,

   0.003235877f, -0.0006243724f,

   -0.001986177f, 0.0005308539f,

   0.00113826f, -0.0003823631f,

   -0.0005953563f, 0.0002298438f,

   0.0002790277f, -0.0001104587f,

   -0.0001123515f, 3.596189e-05f

};

#endif

extern const spx_word16_t lag_window[];

extern const spx_word16_t lpc_window[];

#ifndef DISABLE_ENCODER

void *sb_encoder_init(const SpeexMode *m)

{

   int i;

   spx_int32_t tmp;

   SBEncState *st;

   const SpeexSBMode *mode;

   st = (SBEncState*)speex_alloc(sizeof(SBEncState));

   if (!st)

      return NULL;

   st->mode = m;

   mode = (const SpeexSBMode*)m->mode;

   st->st_low = speex_encoder_init(mode->nb_mode);

#if defined(VAR_ARRAYS) || defined (USE_ALLOCA)

   st->stack = NULL;

#else

   /*st->stack = (char*)speex_alloc_scratch(SB_ENC_STACK);*/

   speex_encoder_ctl(st->st_low, SPEEX_GET_STACK, &st->stack);

#endif

   st->full_frame_size = 2*mode->frameSize;

   st->frame_size = mode->frameSize;

   st->subframeSize = mode->subframeSize;

   st->nbSubframes = mode->frameSize/mode->subframeSize;

   st->windowSize = st->frame_size+st->subframeSize;

   st->lpcSize=mode->lpcSize;

   st->encode_submode = 1;

   st->submodes=mode->submodes;

   st->submodeSelect = st->submodeID=mode->defaultSubmode;

   tmp=9;

   speex_encoder_ctl(st->st_low, SPEEX_SET_QUALITY, &tmp);

   tmp=1;

   speex_encoder_ctl(st->st_low, SPEEX_SET_WIDEBAND, &tmp);

   st->lpc_floor = mode->lpc_floor;

   st->gamma1=mode->gamma1;

   st->gamma2=mode->gamma2;

   st->first=1;

   st->high=(spx_word16_t*)speex_alloc((st->windowSize-st->frame_size)*sizeof(spx_word16_t));

   st->h0_mem=(spx_word16_t*)speex_alloc((QMF_ORDER)*sizeof(spx_word16_t));

   st->window= lpc_window;

   st->lagWindow = lag_window;

   st->old_lsp = (spx_lsp_t*)speex_alloc(st->lpcSize*sizeof(spx_lsp_t));

   st->old_qlsp = (spx_lsp_t*)speex_alloc(st->lpcSize*sizeof(spx_lsp_t));

   st->interp_qlpc = (spx_coef_t*)speex_alloc(st->lpcSize*sizeof(spx_coef_t));

   st->pi_gain = (spx_word32_t*)speex_alloc((st->nbSubframes)*sizeof(spx_word32_t));

   st->exc_rms = (spx_word16_t*)speex_alloc((st->nbSubframes)*sizeof(spx_word16_t));

   st->innov_rms_save = NULL;

   st->mem_sp = (spx_mem_t*)speex_alloc((st->lpcSize)*sizeof(spx_mem_t));

   st->mem_sp2 = (spx_mem_t*)speex_alloc((st->lpcSize)*sizeof(spx_mem_t));

   st->mem_sw = (spx_mem_t*)speex_alloc((st->lpcSize)*sizeof(spx_mem_t));

   for (i=0;i<st->lpcSize;i++)

      st->old_lsp[i]= DIV32(MULT16_16(QCONST16(3.1415927f, LSP_SHIFT), i+1), st->lpcSize+1);

#ifndef DISABLE_VBR

   st->vbr_quality = 8;

   st->vbr_enabled = 0;

   st->vbr_max = 0;

   st->vbr_max_high = 20000;  /* We just need a big value here */

   st->vad_enabled = 0;

   st->abr_enabled = 0;

   st->relative_quality=0;

#endif /* #ifndef DISABLE_VBR */

   st->complexity=2;

   speex_encoder_ctl(st->st_low, SPEEX_GET_SAMPLING_RATE, &st->sampling_rate);

   st->sampling_rate*=2;

#ifdef ENABLE_VALGRIND

   VALGRIND_MAKE_MEM_DEFINED(st, (st->stack-(char*)st));

#endif

   return st;

}

void sb_encoder_destroy(void *state)

{

   SBEncState *st=(SBEncState*)state;

   speex_encoder_destroy(st->st_low);

#if !(defined(VAR_ARRAYS) || defined (USE_ALLOCA))

   /*speex_free_scratch(st->stack);*/

#endif

   speex_free(st->high);

   speex_free(st->h0_mem);

   speex_free(st->old_lsp);

   speex_free(st->old_qlsp);

   speex_free(st->interp_qlpc);

   speex_free(st->pi_gain);

   speex_free(st->exc_rms);

   speex_free(st->mem_sp);

   speex_free(st->mem_sp2);

   speex_free(st->mem_sw);

   speex_free(st);

}

int sb_encoder_ctl(void *state, int request, void *ptr)

{

   SBEncState *st;

   st=(SBEncState*)state;

   switch(request)

   {

   case SPEEX_GET_FRAME_SIZE:

      (*(spx_int32_t*)ptr) = st->full_frame_size;

      break;

   case SPEEX_SET_HIGH_MODE:

      st->submodeSelect = st->submodeID = (*(spx_int32_t*)ptr);

      break;

   case SPEEX_SET_LOW_MODE:

      speex_encoder_ctl(st->st_low, SPEEX_SET_LOW_MODE, ptr);

      break;

   case SPEEX_SET_DTX:

      speex_encoder_ctl(st->st_low, SPEEX_SET_DTX, ptr);

      break;

   case SPEEX_GET_DTX:

      speex_encoder_ctl(st->st_low, SPEEX_GET_DTX, ptr);

      break;

   case SPEEX_GET_LOW_MODE:

      speex_encoder_ctl(st->st_low, SPEEX_GET_LOW_MODE, ptr);

      break;

   case SPEEX_SET_MODE:

      speex_encoder_ctl(st, SPEEX_SET_QUALITY, ptr);

      break;

#ifndef DISABLE_VBR

   case SPEEX_SET_VBR:

      st->vbr_enabled = (*(spx_int32_t*)ptr);

      speex_encoder_ctl(st->st_low, SPEEX_SET_VBR, ptr);

      break;

   case SPEEX_GET_VBR:

      (*(spx_int32_t*)ptr) = st->vbr_enabled;

      break;

   case SPEEX_SET_VAD:

      st->vad_enabled = (*(spx_int32_t*)ptr);

      speex_encoder_ctl(st->st_low, SPEEX_SET_VAD, ptr);

      break;

   case SPEEX_GET_VAD:

      (*(spx_int32_t*)ptr) = st->vad_enabled;

      break;

#endif /* #ifndef DISABLE_VBR */

#if !defined(DISABLE_VBR) && !defined(DISABLE_FLOAT_API)

   case SPEEX_SET_VBR_QUALITY:

      {

         spx_int32_t q;

         float qual = (*(float*)ptr)+.6;

         st->vbr_quality = (*(float*)ptr);

         if (qual>10)

            qual=10;

         q=(int)floor(.5+*(float*)ptr);

         if (q>10)

            q=10;

         speex_encoder_ctl(st->st_low, SPEEX_SET_VBR_QUALITY, &qual);

         speex_encoder_ctl(state, SPEEX_SET_QUALITY, &q);

         break;

      }

   case SPEEX_GET_VBR_QUALITY:

      (*(float*)ptr) = st->vbr_quality;

      break;

#endif /* #if !defined(DISABLE_VBR) && !defined(DISABLE_FLOAT_API) */

#ifndef DISABLE_VBR

   case SPEEX_SET_ABR:

      st->abr_enabled = (*(spx_int32_t*)ptr);

      st->vbr_enabled = st->abr_enabled!=0;

      speex_encoder_ctl(st->st_low, SPEEX_SET_VBR, &st->vbr_enabled);

      if (st->vbr_enabled)

      {

         spx_int32_t i=10, rate, target;

         float vbr_qual;

         target = (*(spx_int32_t*)ptr);

         while (i>=0)

         {

            speex_encoder_ctl(st, SPEEX_SET_QUALITY, &i);

            speex_encoder_ctl(st, SPEEX_GET_BITRATE, &rate);

            if (rate <= target)

               break;

            i--;

         }

         vbr_qual=i;

         if (vbr_qual<0)

            vbr_qual=0;

         speex_encoder_ctl(st, SPEEX_SET_VBR_QUALITY, &vbr_qual);

         st->abr_count=0;

         st->abr_drift=0;

         st->abr_drift2=0;

      }

      break;

   case SPEEX_GET_ABR:

      (*(spx_int32_t*)ptr) = st->abr_enabled;

      break;

#endif /* #ifndef DISABLE_VBR */

   case SPEEX_SET_QUALITY:

      {

         spx_int32_t nb_qual;

         int quality = (*(spx_int32_t*)ptr);

         if (quality < 0)

            quality = 0;

         if (quality > 10)

            quality = 10;

         st->submodeSelect = st->submodeID = ((const SpeexSBMode*)(st->mode->mode))->quality_map[quality];

         nb_qual = ((const SpeexSBMode*)(st->mode->mode))->low_quality_map[quality];

         speex_encoder_ctl(st->st_low, SPEEX_SET_MODE, &nb_qual);

      }

      break;

   case SPEEX_SET_COMPLEXITY:

      speex_encoder_ctl(st->st_low, SPEEX_SET_COMPLEXITY, ptr);

      st->complexity = (*(spx_int32_t*)ptr);

      if (st->complexity<1)

         st->complexity=1;

      break;

   case SPEEX_GET_COMPLEXITY:

      (*(spx_int32_t*)ptr) = st->complexity;

      break;

   case SPEEX_SET_BITRATE:

      {

         spx_int32_t i=10;

         spx_int32_t rate, target;

         target = (*(spx_int32_t*)ptr);

         while (i>=0)

         {

            speex_encoder_ctl(st, SPEEX_SET_QUALITY, &i);

            speex_encoder_ctl(st, SPEEX_GET_BITRATE, &rate);

            if (rate <= target)

               break;

            i--;

         }

      }

      break;

   case SPEEX_GET_BITRATE:

      speex_encoder_ctl(st->st_low, request, ptr);

      /*fprintf (stderr, "before: %d\n", (*(int*)ptr));*/

      if (st->submodes[st->submodeID])

         (*(spx_int32_t*)ptr) += st->sampling_rate*SUBMODE(bits_per_frame)/st->full_frame_size;

      else

         (*(spx_int32_t*)ptr) += st->sampling_rate*(SB_SUBMODE_BITS+1)/st->full_frame_size;

      /*fprintf (stderr, "after: %d\n", (*(int*)ptr));*/

      break;

   case SPEEX_SET_SAMPLING_RATE:

      {

         spx_int32_t tmp=(*(spx_int32_t*)ptr);

         st->sampling_rate = tmp;

         tmp>>=1;

         speex_encoder_ctl(st->st_low, SPEEX_SET_SAMPLING_RATE, &tmp);

      }

      break;

   case SPEEX_GET_SAMPLING_RATE:

      (*(spx_int32_t*)ptr)=st->sampling_rate;

      break;

   case SPEEX_RESET_STATE:

      {

         int i;

         st->first = 1;

         for (i=0;i<st->lpcSize;i++)

            st->old_lsp[i]= DIV32(MULT16_16(QCONST16(3.1415927f, LSP_SHIFT), i+1), st->lpcSize+1);

         for (i=0;i<st->lpcSize;i++)

            st->mem_sw[i]=st->mem_sp[i]=st->mem_sp2[i]=0;

         for (i=0;i<QMF_ORDER;i++)

            st->h0_mem[i]=0;

      }

      break;

   case SPEEX_SET_SUBMODE_ENCODING:

      st->encode_submode = (*(spx_int32_t*)ptr);

      speex_encoder_ctl(st->st_low, SPEEX_SET_SUBMODE_ENCODING, ptr);

      break;

   case SPEEX_GET_SUBMODE_ENCODING:

      (*(spx_int32_t*)ptr) = st->encode_submode;

      break;

   case SPEEX_GET_LOOKAHEAD:

      speex_encoder_ctl(st->st_low, SPEEX_GET_LOOKAHEAD, ptr);

      (*(spx_int32_t*)ptr) = 2*(*(spx_int32_t*)ptr) + QMF_ORDER - 1;

      break;

   case SPEEX_SET_PLC_TUNING:

      speex_encoder_ctl(st->st_low, SPEEX_SET_PLC_TUNING, ptr);

      break;

   case SPEEX_GET_PLC_TUNING:

      speex_encoder_ctl(st->st_low, SPEEX_GET_PLC_TUNING, ptr);

      break;

#ifndef DISABLE_VBR

   case SPEEX_SET_VBR_MAX_BITRATE:

      {

         st->vbr_max = (*(spx_int32_t*)ptr);

         if (SPEEX_SET_VBR_MAX_BITRATE<1)

         {

            speex_encoder_ctl(st->st_low, SPEEX_SET_VBR_MAX_BITRATE, &st->vbr_max);

            st->vbr_max_high = 17600;

         } else {

            spx_int32_t low_rate;

            if (st->vbr_max >= 42200)

            {

               st->vbr_max_high = 17600;

            } else if (st->vbr_max >= 27800)

            {

               st->vbr_max_high = 9600;

            } else if (st->vbr_max > 20600)

            {

               st->vbr_max_high = 5600;

            } else {

               st->vbr_max_high = 1800;

            }

            if (st->subframeSize==80)

               st->vbr_max_high = 1800;

            low_rate = st->vbr_max - st->vbr_max_high;

            speex_encoder_ctl(st->st_low, SPEEX_SET_VBR_MAX_BITRATE, &low_rate);

         }

      }

      break;

   case SPEEX_GET_VBR_MAX_BITRATE:

      (*(spx_int32_t*)ptr) = st->vbr_max;

      break;

#endif /* #ifndef DISABLE_VBR */

   case SPEEX_SET_HIGHPASS:

      speex_encoder_ctl(st->st_low, SPEEX_SET_HIGHPASS, ptr);

      break;

   case SPEEX_GET_HIGHPASS:

      speex_encoder_ctl(st->st_low, SPEEX_GET_HIGHPASS, ptr);

      break;

   /* This is all internal stuff past this point */

   case SPEEX_GET_PI_GAIN:

      {

         int i;

         spx_word32_t *g = (spx_word32_t*)ptr;

         for (i=0;i<st->nbSubframes;i++)

            g[i]=st->pi_gain[i];

      }

      break;

   case SPEEX_GET_EXC:

      {

         int i;

         for (i=0;i<st->nbSubframes;i++)

            ((spx_word16_t*)ptr)[i] = st->exc_rms[i];

      }

      break;

#ifndef DISABLE_VBR

   case SPEEX_GET_RELATIVE_QUALITY:

      (*(float*)ptr)=st->relative_quality;

      break;

#endif /* #ifndef DISABLE_VBR */

   case SPEEX_SET_INNOVATION_SAVE:

      st->innov_rms_save = (spx_word16_t*)ptr;

      break;

   case SPEEX_SET_WIDEBAND:

      speex_encoder_ctl(st->st_low, SPEEX_SET_WIDEBAND, ptr);

      break;

   case SPEEX_GET_STACK:

      *((char**)ptr) = st->stack;

      break;

   default:

      speex_warning_int("Unknown nb_ctl request: ", request);

      return -1;

   }

   return 0;

}

int sb_encode(void *state, void *vin, SpeexBits *bits)

{

   SBEncState *st;

   int i, roots, sub;

   char *stack;

   VARDECL(spx_mem_t *mem);

   VARDECL(spx_sig_t *innov);

   VARDECL(spx_word16_t *target);

   VARDECL(spx_word16_t *syn_resp);

   VARDECL(spx_word32_t *low_pi_gain);

   spx_word16_t *low;

   spx_word16_t *high;

   VARDECL(spx_word16_t *low_exc_rms);

   VARDECL(spx_word16_t *low_innov_rms);

   const SpeexSBMode *mode;

   spx_int32_t dtx;

   spx_word16_t *in = (spx_word16_t*)vin;

   spx_word16_t e_low=0, e_high=0;

   VARDECL(spx_coef_t *lpc);

   VARDECL(spx_coef_t *interp_lpc);

   VARDECL(spx_coef_t *bw_lpc1);

   VARDECL(spx_coef_t *bw_lpc2);

   VARDECL(spx_lsp_t *lsp);

   VARDECL(spx_lsp_t *qlsp);

   VARDECL(spx_lsp_t *interp_lsp);

   VARDECL(spx_lsp_t *interp_qlsp);

   st = (SBEncState*)state;

   stack=st->stack;

   mode = (const SpeexSBMode*)(st->mode->mode);

   low = in;

   high = in+st->frame_size;

   /* High-band buffering / sync with low band */

   /* Compute the two sub-bands by filtering with QMF h0*/

   qmf_decomp(in, h0, low, high, st->full_frame_size, QMF_ORDER, st->h0_mem, stack);

#ifndef DISABLE_VBR

   if (st->vbr_enabled || st->vad_enabled)

   {

      /* Need to compute things here before the signal is trashed by the encoder */

      /*FIXME: Are the two signals (low, high) in sync? */

      e_low = compute_rms16(low, st->frame_size);

      e_high = compute_rms16(high, st->frame_size);

   }

#endif /* #ifndef DISABLE_VBR */

   ALLOC(low_innov_rms, st->nbSubframes, spx_word16_t);

   speex_encoder_ctl(st->st_low, SPEEX_SET_INNOVATION_SAVE, low_innov_rms);

   /* Encode the narrowband part*/

   speex_encode_native(st->st_low, low, bits);

   high = high - (st->windowSize-st->frame_size);

   SPEEX_COPY(high, st->high, st->windowSize-st->frame_size);

   SPEEX_COPY(st->high, &high[st->frame_size], st->windowSize-st->frame_size);

   ALLOC(low_pi_gain, st->nbSubframes, spx_word32_t);

   ALLOC(low_exc_rms, st->nbSubframes, spx_word16_t);

   speex_encoder_ctl(st->st_low, SPEEX_GET_PI_GAIN, low_pi_gain);

   speex_encoder_ctl(st->st_low, SPEEX_GET_EXC, low_exc_rms);

   speex_encoder_ctl(st->st_low, SPEEX_GET_LOW_MODE, &dtx);

   if (dtx==0)

      dtx=1;

   else

      dtx=0;

   ALLOC(lpc, st->lpcSize, spx_coef_t);

   ALLOC(interp_lpc, st->lpcSize, spx_coef_t);

   ALLOC(bw_lpc1, st->lpcSize, spx_coef_t);

   ALLOC(bw_lpc2, st->lpcSize, spx_coef_t);

   ALLOC(lsp, st->lpcSize, spx_lsp_t);

   ALLOC(qlsp, st->lpcSize, spx_lsp_t);

   ALLOC(interp_lsp, st->lpcSize, spx_lsp_t);

   ALLOC(interp_qlsp, st->lpcSize, spx_lsp_t);

   {

      VARDECL(spx_word16_t *autocorr);

      VARDECL(spx_word16_t *w_sig);

      ALLOC(autocorr, st->lpcSize+1, spx_word16_t);

      ALLOC(w_sig, st->windowSize, spx_word16_t);

      /* Window for analysis */

      /* FIXME: This is a kludge */

      if (st->subframeSize==80)

      {

         for (i=0;i<st->windowSize;i++)

            w_sig[i] = EXTRACT16(SHR32(MULT16_16(high[i],st->window[i>>1]),SIG_SHIFT));

      } else {

         for (i=0;i<st->windowSize;i++)

            w_sig[i] = EXTRACT16(SHR32(MULT16_16(high[i],st->window[i]),SIG_SHIFT));

      }

      /* Compute auto-correlation */

      _spx_autocorr(w_sig, autocorr, st->lpcSize+1, st->windowSize);

      autocorr[0] = ADD16(autocorr[0],MULT16_16_Q15(autocorr[0],st->lpc_floor)); /* Noise floor in auto-correlation domain */

      /* Lag windowing: equivalent to filtering in the power-spectrum domain */

      for (i=0;i<st->lpcSize+1;i++)

         autocorr[i] = MULT16_16_Q14(autocorr[i],st->lagWindow[i]);

      /* Levinson-Durbin */

      _spx_lpc(lpc, autocorr, st->lpcSize);

   }

   /* LPC to LSPs (x-domain) transform */

   roots=lpc_to_lsp (lpc, st->lpcSize, lsp, 10, LSP_DELTA1, stack);

   if (roots!=st->lpcSize)

   {

      roots = lpc_to_lsp (lpc, st->lpcSize, lsp, 10, LSP_DELTA2, stack);

      if (roots!=st->lpcSize) {

         /*If we can't find all LSP's, do some damage control and use a flat filter*/

         for (i=0;i<st->lpcSize;i++)

         {

            lsp[i]=st->old_lsp[i];

         }

      }

   }

#ifndef DISABLE_VBR

   /* VBR code */

   if ((st->vbr_enabled || st->vad_enabled) && !dtx)

   {

      float ratio;

      if (st->abr_enabled)

      {

         float qual_change=0;

         if (st->abr_drift2 * st->abr_drift > 0)

         {

            /* Only adapt if long-term and short-term drift are the same sign */

            qual_change = -.00001*st->abr_drift/(1+st->abr_count);

            if (qual_change>.1)

               qual_change=.1;

            if (qual_change<-.1)

               qual_change=-.1;

         }

         st->vbr_quality += qual_change;

         if (st->vbr_quality>10)

            st->vbr_quality=10;

         if (st->vbr_quality<0)

            st->vbr_quality=0;

      }

      ratio = 2*log((1.f+e_high)/(1.f+e_low));

      speex_encoder_ctl(st->st_low, SPEEX_GET_RELATIVE_QUALITY, &st->relative_quality);

      if (ratio<-4)

         ratio=-4;

      if (ratio>2)

         ratio=2;

      /*if (ratio>-2)*/

      if (st->vbr_enabled)

      {

         spx_int32_t modeid;

         modeid = mode->nb_modes-1;

         st->relative_quality+=1.0*(ratio+2);

   if (st->relative_quality<-1)

            st->relative_quality=-1;

         while (modeid)

         {

            int v1;

            float thresh;

            v1=(int)floor(st->vbr_quality);

            if (v1==10)

               thresh = mode->vbr_thresh[modeid][v1];

            else

               thresh = (st->vbr_quality-v1)   * mode->vbr_thresh[modeid][v1+1] +

                        (1+v1-st->vbr_quality) * mode->vbr_thresh[modeid][v1];

            if (st->relative_quality >= thresh && st->sampling_rate*st->submodes[modeid]->bits_per_frame/st->full_frame_size <= st->vbr_max_high)

               break;

            modeid--;

         }

         speex_encoder_ctl(state, SPEEX_SET_HIGH_MODE, &modeid);

         if (st->abr_enabled)

         {

            spx_int32_t bitrate;

            speex_encoder_ctl(state, SPEEX_GET_BITRATE, &bitrate);

            st->abr_drift+=(bitrate-st->abr_enabled);

            st->abr_drift2 = .95*st->abr_drift2 + .05*(bitrate-st->abr_enabled);

            st->abr_count += 1.0;

         }

      } else {

         /* VAD only */

         int modeid;

         if (st->relative_quality<2.0)

            modeid=1;

         else

            modeid=st->submodeSelect;

         /*speex_encoder_ctl(state, SPEEX_SET_MODE, &mode);*/

         st->submodeID=modeid;

      }

      /*fprintf (stderr, "%f %f\n", ratio, low_qual);*/

   }

#endif /* #ifndef DISABLE_VBR */

   if (st->encode_submode)

   {

      speex_bits_pack(bits, 1, 1);

      if (dtx)

         speex_bits_pack(bits, 0, SB_SUBMODE_BITS);

      else

         speex_bits_pack(bits, st->submodeID, SB_SUBMODE_BITS);

   }

   /* If null mode (no transmission), just set a couple things to zero*/

   if (dtx || st->submodes[st->submodeID] == NULL)

   {

      for (i=0;i<st->frame_size;i++)

         high[i]=VERY_SMALL;

      for (i=0;i<st->lpcSize;i++)

         st->mem_sw[i]=0;

      st->first=1;

      /* Final signal synthesis from excitation */

      iir_mem16(high, st->interp_qlpc, high, st->frame_size, st->lpcSize, st->mem_sp, stack);

      if (dtx)

         return 0;

      else

         return 1;

   }

   /* LSP quantization */

   SUBMODE(lsp_quant)(lsp, qlsp, st->lpcSize, bits);

   if (st->first)

   {

      for (i=0;i<st->lpcSize;i++)

         st->old_lsp[i] = lsp[i];

      for (i=0;i<st->lpcSize;i++)

         st->old_qlsp[i] = qlsp[i];

   }

   ALLOC(mem, st->lpcSize, spx_mem_t);

   ALLOC(syn_resp, st->subframeSize, spx_word16_t);

   ALLOC(innov, st->subframeSize, spx_sig_t);

   ALLOC(target, st->subframeSize, spx_word16_t);

   for (sub=0;sub<st->nbSubframes;sub++)

   {

      VARDECL(spx_word16_t *exc);

      VARDECL(spx_word16_t *res);

      VARDECL(spx_word16_t *sw);

      spx_word16_t *sp;

      spx_word16_t filter_ratio;     /*Q7*/

      int offset;

      spx_word32_t rl, rh;           /*Q13*/

      spx_word16_t eh=0;

      offset = st->subframeSize*sub;

      sp=high+offset;

      ALLOC(exc, st->subframeSize, spx_word16_t);

      ALLOC(res, st->subframeSize, spx_word16_t);

      ALLOC(sw, st->subframeSize, spx_word16_t);

      /* LSP interpolation (quantized and unquantized) */

      lsp_interpolate(st->old_lsp, lsp, interp_lsp, st->lpcSize, sub, st->nbSubframes, LSP_MARGIN);

      lsp_interpolate(st->old_qlsp, qlsp, interp_qlsp, st->lpcSize, sub, st->nbSubframes, LSP_MARGIN);

      lsp_to_lpc(interp_lsp, interp_lpc, st->lpcSize,stack);

      lsp_to_lpc(interp_qlsp, st->interp_qlpc, st->lpcSize, stack);

      bw_lpc(st->gamma1, interp_lpc, bw_lpc1, st->lpcSize);

      bw_lpc(st->gamma2, interp_lpc, bw_lpc2, st->lpcSize);

      /* Compute mid-band (4000 Hz for wideband) response of low-band and high-band

         filters */

      st->pi_gain[sub]=LPC_SCALING;

      rh = LPC_SCALING;

      for (i=0;i<st->lpcSize;i+=2)

      {

         rh += st->interp_qlpc[i+1] - st->interp_qlpc[i];

         st->pi_gain[sub] += st->interp_qlpc[i] + st->interp_qlpc[i+1];

      }

      rl = low_pi_gain[sub];

#ifdef FIXED_POINT

      filter_ratio=EXTRACT16(SATURATE(PDIV32(SHL32(ADD32(rl,82),7),ADD32(82,rh)),32767));

#else

      filter_ratio=(rl+.01)/(rh+.01);

#endif

      /* Compute "real excitation" */

      fir_mem16(sp, st->interp_qlpc, exc, st->subframeSize, st->lpcSize, st->mem_sp2, stack);

      /* Compute energy of low-band and high-band excitation */

      eh = compute_rms16(exc, st->subframeSize);

      if (!SUBMODE(innovation_quant)) {/* 1 for spectral folding excitation, 0 for stochastic */

         spx_word32_t g;   /*Q7*/

         spx_word16_t el;  /*Q0*/

         el = low_innov_rms[sub];

         /* Gain to use if we want to use the low-band excitation for high-band */

         g=PDIV32(MULT16_16(filter_ratio,eh),EXTEND32(ADD16(1,el)));

#if 0

         {

            char *tmp_stack=stack;

            float *tmp_sig;

            float g2;

            ALLOC(tmp_sig, st->subframeSize, spx_sig_t);

            for (i=0;i<st->lpcSize;i++)

               mem[i]=st->mem_sp[i];

            iir_mem2(st->low_innov+offset, st->interp_qlpc, tmp_sig, st->subframeSize, st->lpcSize, mem);

            g2 = compute_rms(sp, st->subframeSize)/(.01+compute_rms(tmp_sig, st->subframeSize));

            /*fprintf (stderr, "gains: %f %f\n", g, g2);*/

            g = g2;

            stack = tmp_stack;

         }

#endif

         /*print_vec(&g, 1, "gain factor");*/

         /* Gain quantization */

         {

            int quant = scal_quant(g, fold_quant_bound, 32);

            /*speex_warning_int("tata", quant);*/

            if (quant<0)

               quant=0;

            if (quant>31)

               quant=31;

            speex_bits_pack(bits, quant, 5);

         }

         if (st->innov_rms_save)

         {

            st->innov_rms_save[sub] = eh;

         }

         st->exc_rms[sub] = eh;

      } else {

         spx_word16_t gc;       /*Q7*/

         spx_word32_t scale;    /*Q14*/

         spx_word16_t el;       /*Q0*/

         el = low_exc_rms[sub]; /*Q0*/

         gc = PDIV32_16(MULT16_16(filter_ratio,1+eh),1+el);

         /* This is a kludge that cleans up a historical bug */

         if (st->subframeSize==80)

            gc = MULT16_16_P15(QCONST16(0.70711f,15),gc);

         /*printf ("%f %f %f %f\n", el, eh, filter_ratio, gc);*/

         {

            int qgc = scal_quant(gc, gc_quant_bound, 16);

            speex_bits_pack(bits, qgc, 4);

            gc = MULT16_16_Q15(QCONST16(0.87360,15),gc_quant_bound[qgc]);

         }

         if (st->subframeSize==80)

            gc = MULT16_16_P14(QCONST16(1.4142f,14), gc);

         scale = SHL32(MULT16_16(PDIV32_16(SHL32(EXTEND32(gc),SIG_SHIFT-6),MAX16(EPSILON,filter_ratio)),(1+el)),6);

         compute_impulse_response(st->interp_qlpc, bw_lpc1, bw_lpc2, syn_resp, st->subframeSize, st->lpcSize, stack);

         /* Reset excitation */

         for (i=0;i<st->subframeSize;i++)

            res[i]=VERY_SMALL;

         /* Compute zero response (ringing) of A(z/g1) / ( A(z/g2) * Aq(z) ) */

         for (i=0;i<st->lpcSize;i++)

            mem[i]=st->mem_sp[i];

         iir_mem16(res, st->interp_qlpc, res, st->subframeSize, st->lpcSize, mem, stack);

         for (i=0;i<st->lpcSize;i++)

            mem[i]=st->mem_sw[i];

         filter_mem16(res, bw_lpc1, bw_lpc2, res, st->subframeSize, st->lpcSize, mem, stack);

         /* Compute weighted signal */

         for (i=0;i<st->lpcSize;i++)

            mem[i]=st->mem_sw[i];

         filter_mem16(sp, bw_lpc1, bw_lpc2, sw, st->subframeSize, st->lpcSize, mem, stack);

         /* Compute target signal */

         for (i=0;i<st->subframeSize;i++)

            target[i]=SUB16(sw[i],res[i]);