text: /* Copyright (C) 2002-2006 Jean-Marc Valin 
     File: cb_search.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 "cb_search.h"
  #include "filters.h"
  #include "stack_alloc.h"
  #include "vq.h"
  #include "arch.h"
  #include "math_approx.h"
  #include "os_support.h"
  
  #ifdef _USE_SSE
  #include "cb_search_sse.h"
  #elif defined(ARM4_ASM) || defined(ARM5E_ASM)
  #include "cb_search_arm4.h"
  #elif defined(BFIN_ASM)
  #include "cb_search_bfin.h"
  #endif
  
  #ifndef OVERRIDE_COMPUTE_WEIGHTED_CODEBOOK
  static void compute_weighted_codebook(const signed char *shape_cb, const spx_word16_t *r, spx_word16_t *resp, spx_word16_t *resp2, spx_word32_t *E, int shape_cb_size, int subvect_size, char *stack)
  {
     int i, j, k;
     VARDECL(spx_word16_t *shape);
     ALLOC(shape, subvect_size, spx_word16_t);
     for (i=0;i<shape_cb_size;i++)
     {
        spx_word16_t *res;
        
        res = resp+i*subvect_size;
        for (k=0;k<subvect_size;k++)
           shape[k] = (spx_word16_t)shape_cb[i*subvect_size+k];
        E[i]=0;
  
        /* Compute codeword response using convolution with impulse response */
        for(j=0;j<subvect_size;j++)
        {
           spx_word32_t resj=0;
           spx_word16_t res16;
           for (k=0;k<=j;k++)
              resj = MAC16_16(resj,shape[k],r[j-k]);
  #ifdef FIXED_POINT
           res16 = EXTRACT16(SHR32(resj, 13));
  #else
           res16 = 0.03125f*resj;
  #endif
           /* Compute codeword energy */
           E[i]=MAC16_16(E[i],res16,res16);
           res[j] = res16;
           /*printf ("%d\n", (int)res[j]);*/
        }
     }
  
  }
  #endif
  
  #ifndef OVERRIDE_TARGET_UPDATE
  static inline void target_update(spx_word16_t *t, spx_word16_t g, spx_word16_t *r, int len)
  {
     int n;
     for (n=0;n<len;n++)
        t[n] = SUB16(t[n],PSHR32(MULT16_16(g,r[n]),13));
  }
  #endif
  
  
  
  static void split_cb_search_shape_sign_N1(
  spx_word16_t target[],			/* target vector */
  spx_coef_t ak[],			/* LPCs for this subframe */
  spx_coef_t awk1[],			/* Weighted LPCs for this subframe */
  spx_coef_t awk2[],			/* Weighted LPCs for this subframe */
  const void *par,                      /* Codebook/search parameters*/
  int   p,                        /* number of LPC coeffs */
  int   nsf,                      /* number of samples in subframe */
  spx_sig_t *exc,
  spx_word16_t *r,
  SpeexBits *bits,
  char *stack,
  int   update_target
  )
  {
     int i,j,m,q;
     VARDECL(spx_word16_t *resp);
  #ifdef _USE_SSE
     VARDECL(__m128 *resp2);
     VARDECL(__m128 *E);
  #else
     spx_word16_t *resp2;
     VARDECL(spx_word32_t *E);
  #endif
     VARDECL(spx_word16_t *t);
     VARDECL(spx_sig_t *e);
     const signed char *shape_cb;
     int shape_cb_size, subvect_size, nb_subvect;
     const split_cb_params *params;
     int best_index;
     spx_word32_t best_dist;
     int have_sign;
     
     params = (const split_cb_params *) par;
     subvect_size = params->subvect_size;
     nb_subvect = params->nb_subvect;
     shape_cb_size = 1<<params->shape_bits;
     shape_cb = params->shape_cb;
     have_sign = params->have_sign;
     ALLOC(resp, shape_cb_size*subvect_size, spx_word16_t);
  #ifdef _USE_SSE
     ALLOC(resp2, (shape_cb_size*subvect_size)>>2, __m128);
     ALLOC(E, shape_cb_size>>2, __m128);
  #else
     resp2 = resp;
     ALLOC(E, shape_cb_size, spx_word32_t);
  #endif
     ALLOC(t, nsf, spx_word16_t);
     ALLOC(e, nsf, spx_sig_t);
     
     /* FIXME: Do we still need to copy the target? */
     SPEEX_COPY(t, target, nsf);
  
     compute_weighted_codebook(shape_cb, r, resp, resp2, E, shape_cb_size, subvect_size, stack);
  
     for (i=0;i<nb_subvect;i++)
     {
        spx_word16_t *x=t+subvect_size*i;
        /*Find new n-best based on previous n-best j*/
        if (have_sign)
           vq_nbest_sign(x, resp2, subvect_size, shape_cb_size, E, 1, &best_index, &best_dist, stack);
        else
           vq_nbest(x, resp2, subvect_size, shape_cb_size, E, 1, &best_index, &best_dist, stack);
        
        speex_bits_pack(bits,best_index,params->shape_bits+have_sign);
        
        {
           int rind;
           spx_word16_t *res;
           spx_word16_t sign=1;
           rind = best_index;
           if (rind>=shape_cb_size)
           {
              sign=-1;
              rind-=shape_cb_size;
           }
           res = resp+rind*subvect_size;
           if (sign>0)
              for (m=0;m<subvect_size;m++)
                 t[subvect_size*i+m] = SUB16(t[subvect_size*i+m], res[m]);
           else
              for (m=0;m<subvect_size;m++)
                 t[subvect_size*i+m] = ADD16(t[subvect_size*i+m], res[m]);
  
  #ifdef FIXED_POINT
           if (sign==1)
           {
              for (j=0;j<subvect_size;j++)
                 e[subvect_size*i+j]=SHL32(EXTEND32(shape_cb[rind*subvect_size+j]),SIG_SHIFT-5);
           } else {
              for (j=0;j<subvect_size;j++)
                 e[subvect_size*i+j]=NEG32(SHL32(EXTEND32(shape_cb[rind*subvect_size+j]),SIG_SHIFT-5));
           }
  #else
           for (j=0;j<subvect_size;j++)
              e[subvect_size*i+j]=sign*0.03125*shape_cb[rind*subvect_size+j];
  #endif
        
        }
              
        for (m=0;m<subvect_size;m++)
        {
           spx_word16_t g;
           int rind;
           spx_word16_t sign=1;
           rind = best_index;
           if (rind>=shape_cb_size)
           {
              sign=-1;
              rind-=shape_cb_size;
           }
           
           q=subvect_size-m;
  #ifdef FIXED_POINT
           g=sign*shape_cb[rind*subvect_size+m];
  #else
           g=sign*0.03125*shape_cb[rind*subvect_size+m];
  #endif
           target_update(t+subvect_size*(i+1), g, r+q, nsf-subvect_size*(i+1));
        }
     }
  
     /* Update excitation */
     /* FIXME: We could update the excitation directly above */
     for (j=0;j<nsf;j++)
        exc[j]=ADD32(exc[j],e[j]);
     
     /* Update target: only update target if necessary */
     if (update_target)
     {
        VARDECL(spx_word16_t *r2);
        ALLOC(r2, nsf, spx_word16_t);
        for (j=0;j<nsf;j++)
           r2[j] = EXTRACT16(PSHR32(e[j] ,6));
        syn_percep_zero16(r2, ak, awk1, awk2, r2, nsf,p, stack);
        for (j=0;j<nsf;j++)
           target[j]=SUB16(target[j],PSHR16(r2[j],2));
     }
  }
  
  
  
  void split_cb_search_shape_sign(
  spx_word16_t target[],			/* target vector */
  spx_coef_t ak[],			/* LPCs for this subframe */
  spx_coef_t awk1[],			/* Weighted LPCs for this subframe */
  spx_coef_t awk2[],			/* Weighted LPCs for this subframe */
  const void *par,                      /* Codebook/search parameters*/
  int   p,                        /* number of LPC coeffs */
  int   nsf,                      /* number of samples in subframe */
  spx_sig_t *exc,
  spx_word16_t *r,
  SpeexBits *bits,
  char *stack,
  int   complexity,
  int   update_target
  )
  {
     int i,j,k,m,n,q;
     VARDECL(spx_word16_t *resp);
  #ifdef _USE_SSE
     VARDECL(__m128 *resp2);
     VARDECL(__m128 *E);
  #else
     spx_word16_t *resp2;
     VARDECL(spx_word32_t *E);
  #endif
     VARDECL(spx_word16_t *t);
     VARDECL(spx_sig_t *e);
     VARDECL(spx_word16_t *tmp);
     VARDECL(spx_word32_t *ndist);
     VARDECL(spx_word32_t *odist);
     VARDECL(int *itmp);
     VARDECL(spx_word16_t **ot2);
     VARDECL(spx_word16_t **nt2);
     spx_word16_t **ot, **nt;
     VARDECL(int **nind);
     VARDECL(int **oind);
     VARDECL(int *ind);
     const signed char *shape_cb;
     int shape_cb_size, subvect_size, nb_subvect;
     const split_cb_params *params;
     int N=2;
     VARDECL(int *best_index);
     VARDECL(spx_word32_t *best_dist);
     VARDECL(int *best_nind);
     VARDECL(int *best_ntarget);
     int have_sign;
     N=complexity;
     if (N>10)
        N=10;
     /* Complexity isn't as important for the codebooks as it is for the pitch */
     N=(2*N)/3;
     if (N<1)
        N=1;
     if (N==1)
     {
        split_cb_search_shape_sign_N1(target,ak,awk1,awk2,par,p,nsf,exc,r,bits,stack,update_target);
        return;
     }
     ALLOC(ot2, N, spx_word16_t*);
     ALLOC(nt2, N, spx_word16_t*);
     ALLOC(oind, N, int*);
     ALLOC(nind, N, int*);
  
     params = (const split_cb_params *) par;
     subvect_size = params->subvect_size;
     nb_subvect = params->nb_subvect;
     shape_cb_size = 1<<params->shape_bits;
     shape_cb = params->shape_cb;
     have_sign = params->have_sign;
     ALLOC(resp, shape_cb_size*subvect_size, spx_word16_t);
  #ifdef _USE_SSE
     ALLOC(resp2, (shape_cb_size*subvect_size)>>2, __m128);
     ALLOC(E, shape_cb_size>>2, __m128);
  #else
     resp2 = resp;
     ALLOC(E, shape_cb_size, spx_word32_t);
  #endif
     ALLOC(t, nsf, spx_word16_t);
     ALLOC(e, nsf, spx_sig_t);
     ALLOC(ind, nb_subvect, int);
  
     ALLOC(tmp, 2*N*nsf, spx_word16_t);
     for (i=0;i<N;i++)
     {
        ot2[i]=tmp+2*i*nsf;
        nt2[i]=tmp+(2*i+1)*nsf;
     }
     ot=ot2;
     nt=nt2;
     ALLOC(best_index, N, int);
     ALLOC(best_dist, N, spx_word32_t);
     ALLOC(best_nind, N, int);
     ALLOC(best_ntarget, N, int);
     ALLOC(ndist, N, spx_word32_t);
     ALLOC(odist, N, spx_word32_t);
     
     ALLOC(itmp, 2*N*nb_subvect, int);
     for (i=0;i<N;i++)
     {
        nind[i]=itmp+2*i*nb_subvect;
        oind[i]=itmp+(2*i+1)*nb_subvect;
     }
     
     SPEEX_COPY(t, target, nsf);
  
     for (j=0;j<N;j++)
        SPEEX_COPY(&ot[j][0], t, nsf);
  
     /* Pre-compute codewords response and energy */
     compute_weighted_codebook(shape_cb, r, resp, resp2, E, shape_cb_size, subvect_size, stack);
  
     for (j=0;j<N;j++)
        odist[j]=0;
     
     /*For all subvectors*/
     for (i=0;i<nb_subvect;i++)
     {
        /*"erase" nbest list*/
        for (j=0;j<N;j++)
           ndist[j]=VERY_LARGE32;
        /* This is not strictly necessary, but it provides an additonal safety 
           to prevent crashes in case something goes wrong in the previous
           steps (e.g. NaNs) */
        for (j=0;j<N;j++)
           best_nind[j] = best_ntarget[j] = 0;
        /*For all n-bests of previous subvector*/
        for (j=0;j<N;j++)
        {
           spx_word16_t *x=ot[j]+subvect_size*i;
           spx_word32_t tener = 0;
           for (m=0;m<subvect_size;m++)
              tener = MAC16_16(tener, x[m],x[m]);
  #ifdef FIXED_POINT
           tener = SHR32(tener,1);
  #else
           tener *= .5;
  #endif
           /*Find new n-best based on previous n-best j*/
           if (have_sign)
              vq_nbest_sign(x, resp2, subvect_size, shape_cb_size, E, N, best_index, best_dist, stack);
           else
              vq_nbest(x, resp2, subvect_size, shape_cb_size, E, N, best_index, best_dist, stack);
  
           /*For all new n-bests*/
           for (k=0;k<N;k++)
           {
              /* Compute total distance (including previous sub-vectors */
              spx_word32_t err = ADD32(ADD32(odist[j],best_dist[k]),tener);
              
              /*update n-best list*/
              if (err<ndist[N-1])
              {
                 for (m=0;m<N;m++)
                 {
                    if (err < ndist[m])
                    {
                       for (n=N-1;n>m;n--)
                       {
                          ndist[n] = ndist[n-1];
                          best_nind[n] = best_nind[n-1];
                          best_ntarget[n] = best_ntarget[n-1];
                       }
                       /* n is equal to m here, so they're interchangeable */
                       ndist[m] = err;
                       best_nind[n] = best_index[k];
                       best_ntarget[n] = j;
                       break;
                    }
                 }
              }
           }
           if (i==0)
              break;
        }
        for (j=0;j<N;j++)
        {
           /*previous target (we don't care what happened before*/
           for (m=(i+1)*subvect_size;m<nsf;m++)
              nt[j][m]=ot[best_ntarget[j]][m];
           
           /* New code: update the rest of the target only if it's worth it */
           for (m=0;m<subvect_size;m++)
           {
              spx_word16_t g;
              int rind;
              spx_word16_t sign=1;
              rind = best_nind[j];
              if (rind>=shape_cb_size)
              {
                 sign=-1;
                 rind-=shape_cb_size;
              }
  
              q=subvect_size-m;
  #ifdef FIXED_POINT
              g=sign*shape_cb[rind*subvect_size+m];
  #else
              g=sign*0.03125*shape_cb[rind*subvect_size+m];
  #endif
              target_update(nt[j]+subvect_size*(i+1), g, r+q, nsf-subvect_size*(i+1));
           }
  
           for (q=0;q<nb_subvect;q++)
              nind[j][q]=oind[best_ntarget[j]][q];
           nind[j][i]=best_nind[j];
        }
  
        /*update old-new data*/
        /* just swap pointers instead of a long copy */
        {
           spx_word16_t **tmp2;
           tmp2=ot;
           ot=nt;
           nt=tmp2;
        }
        for (j=0;j<N;j++)
           for (m=0;m<nb_subvect;m++)
              oind[j][m]=nind[j][m];
        for (j=0;j<N;j++)
           odist[j]=ndist[j];
     }
  
     /*save indices*/
     for (i=0;i<nb_subvect;i++)
     {
        ind[i]=nind[0][i];
        speex_bits_pack(bits,ind[i],params->shape_bits+have_sign);
     }
     
     /* Put everything back together */
     for (i=0;i<nb_subvect;i++)
     {
        int rind;
        spx_word16_t sign=1;
        rind = ind[i];
        if (rind>=shape_cb_size)
        {
           sign=-1;
           rind-=shape_cb_size;
        }
  #ifdef FIXED_POINT
        if (sign==1)
        {
           for (j=0;j<subvect_size;j++)
              e[subvect_size*i+j]=SHL32(EXTEND32(shape_cb[rind*subvect_size+j]),SIG_SHIFT-5);
        } else {
           for (j=0;j<subvect_size;j++)
              e[subvect_size*i+j]=NEG32(SHL32(EXTEND32(shape_cb[rind*subvect_size+j]),SIG_SHIFT-5));
        }
  #else
        for (j=0;j<subvect_size;j++)
           e[subvect_size*i+j]=sign*0.03125*shape_cb[rind*subvect_size+j];
  #endif
     }   
     /* Update excitation */
     for (j=0;j<nsf;j++)
        exc[j]=ADD32(exc[j],e[j]);
     
     /* Update target: only update target if necessary */
     if (update_target)
     {
        VARDECL(spx_word16_t *r2);
        ALLOC(r2, nsf, spx_word16_t);
        for (j=0;j<nsf;j++)
           r2[j] = EXTRACT16(PSHR32(e[j] ,6));
        syn_percep_zero16(r2, ak, awk1, awk2, r2, nsf,p, stack);
        for (j=0;j<nsf;j++)
           target[j]=SUB16(target[j],PSHR16(r2[j],2));
     }
  }
  
  
  void split_cb_shape_sign_unquant(
  spx_sig_t *exc,
  const void *par,                      /* non-overlapping codebook */
  int   nsf,                      /* number of samples in subframe */
  SpeexBits *bits,
  char *stack,
  spx_int32_t *seed
  )
  {
     int i,j;
     VARDECL(int *ind);
     VARDECL(int *signs);
     const signed char *shape_cb;
     int shape_cb_size, subvect_size, nb_subvect;
     const split_cb_params *params;
     int have_sign;
  
     params = (const split_cb_params *) par;
     subvect_size = params->subvect_size;
     nb_subvect = params->nb_subvect;
     shape_cb_size = 1<<params->shape_bits;
     shape_cb = params->shape_cb;
     have_sign = params->have_sign;
  
     ALLOC(ind, nb_subvect, int);
     ALLOC(signs, nb_subvect, int);
  
     /* Decode codewords and gains */
     for (i=0;i<nb_subvect;i++)
     {
        if (have_sign)
           signs[i] = speex_bits_unpack_unsigned(bits, 1);
        else
           signs[i] = 0;
        ind[i] = speex_bits_unpack_unsigned(bits, params->shape_bits);
     }
     /* Compute decoded excitation */
     for (i=0;i<nb_subvect;i++)
     {
        spx_word16_t s=1;
        if (signs[i])
           s=-1;
  #ifdef FIXED_POINT
        if (s==1)
        {
           for (j=0;j<subvect_size;j++)
              exc[subvect_size*i+j]=SHL32(EXTEND32(shape_cb[ind[i]*subvect_size+j]),SIG_SHIFT-5);
        } else {
           for (j=0;j<subvect_size;j++)
              exc[subvect_size*i+j]=NEG32(SHL32(EXTEND32(shape_cb[ind[i]*subvect_size+j]),SIG_SHIFT-5));
        }
  #else
        for (j=0;j<subvect_size;j++)
           exc[subvect_size*i+j]+=s*0.03125*shape_cb[ind[i]*subvect_size+j];      
  #endif
     }
  }
  
  void noise_codebook_quant(
  spx_word16_t target[],			/* target vector */
  spx_coef_t ak[],			/* LPCs for this subframe */
  spx_coef_t awk1[],			/* Weighted LPCs for this subframe */
  spx_coef_t awk2[],			/* Weighted LPCs for this subframe */
  const void *par,                      /* Codebook/search parameters*/
  int   p,                        /* number of LPC coeffs */
  int   nsf,                      /* number of samples in subframe */
  spx_sig_t *exc,
  spx_word16_t *r,
  SpeexBits *bits,
  char *stack,
  int   complexity,
  int   update_target
  )
  {
     int i;
     VARDECL(spx_word16_t *tmp);
     ALLOC(tmp, nsf, spx_word16_t);
     residue_percep_zero16(target, ak, awk1, awk2, tmp, nsf, p, stack);
  
     for (i=0;i<nsf;i++)
        exc[i]+=SHL32(EXTEND32(tmp[i]),8);
     SPEEX_MEMSET(target, 0, nsf);
  }
  
  
  void noise_codebook_unquant(
  spx_sig_t *exc,
  const void *par,                      /* non-overlapping codebook */
  int   nsf,                      /* number of samples in subframe */
  SpeexBits *bits,
  char *stack,
  spx_int32_t *seed
  )
  {
     int i;
     /* FIXME: This is bad, but I don't think the function ever gets called anyway */
     for (i=0;i<nsf;i++)
        exc[i]=SHL32(EXTEND32(speex_rand(1, seed)),SIG_SHIFT);
  }
  