/* Copyright (C) 2002 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.*/#include <math.h>#include "sb_celp.h"#include "stdlib.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 "misc.h"#ifndef M_PI#define M_PI           3.14159265358979323846  /* pi */#endif#define sqr(x) ((x)*(x))#define SUBMODE(x) st->submodes[st->submodeID]->x#define QMF_ORDER 64static float h0[64] = {   3.596189e-05, -0.0001123515,   -0.0001104587, 0.0002790277,   0.0002298438, -0.0005953563,   -0.0003823631, 0.00113826,   0.0005308539, -0.001986177,   -0.0006243724, 0.003235877,   0.0005743159, -0.004989147,   -0.0002584767, 0.007367171,   -0.0004857935, -0.01050689,   0.001894714, 0.01459396,   -0.004313674, -0.01994365,   0.00828756, 0.02716055,   -0.01485397, -0.03764973,   0.026447, 0.05543245,   -0.05095487, -0.09779096,   0.1382363, 0.4600981,   0.4600981, 0.1382363,   -0.09779096, -0.05095487,   0.05543245, 0.026447,   -0.03764973, -0.01485397,   0.02716055, 0.00828756,   -0.01994365, -0.004313674,   0.01459396, 0.001894714,   -0.01050689, -0.0004857935,   0.007367171, -0.0002584767,   -0.004989147, 0.0005743159,   0.003235877, -0.0006243724,   -0.001986177, 0.0005308539,   0.00113826, -0.0003823631,   -0.0005953563, 0.0002298438,   0.0002790277, -0.0001104587,   -0.0001123515, 3.596189e-05};static float h1[64] = {   3.596189e-05, 0.0001123515,   -0.0001104587, -0.0002790277,   0.0002298438, 0.0005953563,   -0.0003823631, -0.00113826,   0.0005308539, 0.001986177,   -0.0006243724, -0.003235877,   0.0005743159, 0.004989147,   -0.0002584767, -0.007367171,   -0.0004857935, 0.01050689,   0.001894714, -0.01459396,   -0.004313674, 0.01994365,   0.00828756, -0.02716055,   -0.01485397, 0.03764973,   0.026447, -0.05543245,   -0.05095487, 0.09779096,   0.1382363, -0.4600981,   0.4600981, -0.1382363,   -0.09779096, 0.05095487,   0.05543245, -0.026447,   -0.03764973, 0.01485397,   0.02716055, -0.00828756,   -0.01994365, 0.004313674,   0.01459396, -0.001894714,   -0.01050689, 0.0004857935,   0.007367171, 0.0002584767,   -0.004989147, -0.0005743159,   0.003235877, 0.0006243724,   -0.001986177, -0.0005308539,   0.00113826, 0.0003823631,   -0.0005953563, -0.0002298438,   0.0002790277, 0.0001104587,   -0.0001123515, -3.596189e-05};void *sb_encoder_init(SpeexMode *m){   int i;   SBEncState *st;   SpeexSBMode *mode;   st = (SBEncState*)speex_alloc(sizeof(SBEncState)+8000*sizeof(float));   st->mode = m;   mode = (SpeexSBMode*)m->mode;   st->stack = ((char*)st) + sizeof(SBEncState);   st->st_low = speex_encoder_init(mode->nb_mode);   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*3/2;   st->lpcSize=mode->lpcSize;   st->bufSize=mode->bufSize;   st->submodes=mode->submodes;   st->submodeSelect = st->submodeID=mode->defaultSubmode;      i=9;   speex_encoder_ctl(st->st_low, SPEEX_SET_QUALITY, &i);   st->lag_factor = mode->lag_factor;   st->lpc_floor = mode->lpc_floor;   st->gamma1=mode->gamma1;   st->gamma2=mode->gamma2;   st->first=1;   st->x0d=PUSH(st->stack, st->frame_size, float);   st->x1d=PUSH(st->stack, st->frame_size, float);   st->high=PUSH(st->stack, st->full_frame_size, float);   st->y0=PUSH(st->stack, st->full_frame_size, float);   st->y1=PUSH(st->stack, st->full_frame_size, float);   st->h0_mem=PUSH(st->stack, QMF_ORDER, float);   st->h1_mem=PUSH(st->stack, QMF_ORDER, float);   st->g0_mem=PUSH(st->stack, QMF_ORDER, float);   st->g1_mem=PUSH(st->stack, QMF_ORDER, float);   st->buf=PUSH(st->stack, st->windowSize, float);   st->excBuf=PUSH(st->stack, st->bufSize, float);   st->exc = st->excBuf + st->bufSize - st->windowSize;   st->res=PUSH(st->stack, st->frame_size, float);   st->sw=PUSH(st->stack, st->frame_size, float);   st->target=PUSH(st->stack, st->frame_size, float);   /*Asymmetric "pseudo-Hamming" window*/   {      int part1, part2;      part1 = st->subframeSize*7/2;      part2 = st->subframeSize*5/2;      st->window = PUSH(st->stack, st->windowSize, float);      for (i=0;i<part1;i++)         st->window[i]=.54-.46*cos(M_PI*i/part1);      for (i=0;i<part2;i++)         st->window[part1+i]=.54+.46*cos(M_PI*i/part2);   }   st->lagWindow = PUSH(st->stack, st->lpcSize+1, float);   for (i=0;i<st->lpcSize+1;i++)      st->lagWindow[i]=exp(-.5*sqr(2*M_PI*st->lag_factor*i));   st->rc = PUSH(st->stack, st->lpcSize, float);   st->autocorr = PUSH(st->stack, st->lpcSize+1, float);   st->lpc = PUSH(st->stack, st->lpcSize+1, float);   st->bw_lpc1 = PUSH(st->stack, st->lpcSize+1, float);   st->bw_lpc2 = PUSH(st->stack, st->lpcSize+1, float);   st->lsp = PUSH(st->stack, st->lpcSize, float);   st->qlsp = PUSH(st->stack, st->lpcSize, float);   st->old_lsp = PUSH(st->stack, st->lpcSize, float);   st->old_qlsp = PUSH(st->stack, st->lpcSize, float);   st->interp_lsp = PUSH(st->stack, st->lpcSize, float);   st->interp_qlsp = PUSH(st->stack, st->lpcSize, float);   st->interp_lpc = PUSH(st->stack, st->lpcSize+1, float);   st->interp_qlpc = PUSH(st->stack, st->lpcSize+1, float);   st->pi_gain = PUSH(st->stack, st->nbSubframes, float);   st->mem_sp = PUSH(st->stack, st->lpcSize, float);   st->mem_sp2 = PUSH(st->stack, st->lpcSize, float);   st->mem_sw = PUSH(st->stack, st->lpcSize, float);   st->vbr_quality = 8;   st->vbr_enabled = 0;   st->vad_enabled = 0;   st->abr_enabled = 0;   st->relative_quality=0;   st->complexity=2;   speex_encoder_ctl(st->st_low, SPEEX_GET_SAMPLING_RATE, &st->sampling_rate);   st->sampling_rate*=2;   return st;}void sb_encoder_destroy(void *state){   SBEncState *st=(SBEncState*)state;   speex_encoder_destroy(st->st_low);   speex_free(st);}int sb_encode(void *state, float *in, SpeexBits *bits){   SBEncState *st;   int i, roots, sub;   char *stack;   float *mem, *innov, *syn_resp;   float *low_pi_gain, *low_exc, *low_innov;   SpeexSBMode *mode;   int dtx;   st = (SBEncState*)state;   stack=st->stack;   mode = (SpeexSBMode*)(st->mode->mode);   /* Compute the two sub-bands by filtering with h0 and h1*/   qmf_decomp(in, h0, st->x0d, st->x1d, st->full_frame_size, QMF_ORDER, st->h0_mem, stack);       /* Encode the narrowband part*/   speex_encode(st->st_low, st->x0d, bits);   /* High-band buffering / sync with low band */   for (i=0;i<st->windowSize-st->frame_size;i++)      st->high[i] = st->high[st->frame_size+i];   for (i=0;i<st->frame_size;i++)      st->high[st->windowSize-st->frame_size+i]=st->x1d[i];   speex_move(st->excBuf, st->excBuf+st->frame_size, (st->bufSize-st->frame_size)*sizeof(float));   low_pi_gain = PUSH(stack, st->nbSubframes, float);   low_exc = PUSH(stack, st->frame_size, float);   low_innov = PUSH(stack, st->frame_size, float);   speex_encoder_ctl(st->st_low, SPEEX_GET_PI_GAIN, low_pi_gain);   speex_encoder_ctl(st->st_low, SPEEX_GET_EXC, low_exc);   speex_encoder_ctl(st->st_low, SPEEX_GET_INNOV, low_innov);      speex_encoder_ctl(st->st_low, SPEEX_GET_LOW_MODE, &dtx);   if (dtx==0)      dtx=1;   else      dtx=0;   /* Start encoding the high-band */   for (i=0;i<st->windowSize;i++)      st->buf[i] = st->high[i] * st->window[i];   /* Compute auto-correlation */   _spx_autocorr(st->buf, st->autocorr, st->lpcSize+1, st->windowSize);   st->autocorr[0] += 1;        /* prevents NANs */   st->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++)      st->autocorr[i] *= st->lagWindow[i];   /* Levinson-Durbin */   wld(st->lpc+1, st->autocorr, st->rc, st->lpcSize);   st->lpc[0]=1;   /* LPC to LSPs (x-domain) transform */   roots=lpc_to_lsp (st->lpc, st->lpcSize, st->lsp, 15, 0.2, stack);   if (roots!=st->lpcSize)   {      roots = lpc_to_lsp (st->lpc, st->lpcSize, st->lsp, 11, 0.02, 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++)         {            st->lsp[i]=cos(M_PI*((float)(i+1))/(st->lpcSize+1));         }      }   }   /* x-domain to angle domain*/   for (i=0;i<st->lpcSize;i++)      st->lsp[i] = acos(st->lsp[i]);   /* VBR code */   if ((st->vbr_enabled || st->vad_enabled) && !dtx)   {      float e_low=0, e_high=0;      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;      }      for (i=0;i<st->frame_size;i++)      {         e_low  += st->x0d[i]* st->x0d[i];         e_high += st->high[i]* st->high[i];      }      ratio = log((1+e_high)/(1+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)       {         int 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)               break;            modeid--;         }         speex_encoder_ctl(state, SPEEX_SET_HIGH_MODE, &modeid);         if (st->abr_enabled)         {            int 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);*/   }   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++)         st->exc[i]=st->sw[i]=VERY_SMALL;      for (i=0;i<st->lpcSize;i++)         st->mem_sw[i]=0;      st->first=1;      /* Final signal synthesis from excitation */      iir_mem2(st->exc, st->interp_qlpc, st->high, st->subframeSize, st->lpcSize, st->mem_sp);#ifndef RELEASE      /* Reconstruct the original */      fir_mem_up(st->x0d, h0, st->y0, st->full_frame_size, QMF_ORDER, st->g0_mem, stack);      fir_mem_up(st->high, h1, st->y1, st->full_frame_size, QMF_ORDER, st->g1_mem, stack);      for (i=0;i<st->full_frame_size;i++)         in[i]=2*(st->y0[i]-st->y1[i]);#endif      if (dtx)         return 0;      else         return 1;   }   /* LSP quantization */   SUBMODE(lsp_quant)(st->lsp, st->qlsp, st->lpcSize, bits);      if (st->first)   {      for (i=0;i<st->lpcSize;i++)         st->old_lsp[i] = st->lsp[i];      for (i=0;i<st->lpcSize;i++)         st->old_qlsp[i] = st->qlsp[i];   }      mem=PUSH(stack, st->lpcSize, float);   syn_resp=PUSH(stack, st->subframeSize, float);   innov = PUSH(stack, st->subframeSize, float);   for (sub=0;sub<st->nbSubframes;sub++)   {