/* Copyright (C) 2002 Jean-Marc Valin

   File: vq.c

   Vector quantization

   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 "vq.h"

#include "stack_alloc.h"

#include "arch.h"

#ifdef _USE_SSE

#include <xmmintrin.h>

#include "vq_sse.h"

#elif defined(SHORTCUTS) && (defined(ARM4_ASM) || defined(ARM5E_ASM))

#include "vq_arm4.h"

#elif defined(BFIN_ASM)

#include "vq_bfin.h"

#endif

#ifndef DISABLE_ENCODER

int scal_quant(spx_word16_t in, const spx_word16_t *boundary, int entries)

{

   int i=0;

   while (i<entries-1 && in>boundary[0])

   {

      boundary++;

      i++;

   }

   return i;

}

int scal_quant32(spx_word32_t in, const spx_word32_t *boundary, int entries)

{

   int i=0;

   while (i<entries-1 && in>boundary[0])

   {

      boundary++;

      i++;

   }

   return i;

}

#endif /* DISABLE_ENCODER */

#if !defined(OVERRIDE_VQ_NBEST) && !defined(DISABLE_ENCODER)

/*Finds the indices of the n-best entries in a codebook*/

void vq_nbest(spx_word16_t *in, const spx_word16_t *codebook, int len, int entries, spx_word32_t *E, int N, int *nbest, spx_word32_t *best_dist, char *stack)

{

   int i,j,k,used;

   used = 0;

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

   {

      spx_word32_t dist=0;

      for (j=0;j<len;j++)

         dist = MAC16_16(dist,in[j],*codebook++);

#ifdef FIXED_POINT

      dist=SUB32(SHR32(E[i],1),dist);

#else

      dist=.5f*E[i]-dist;

#endif

      if (i<N || dist<best_dist[N-1])

      {

         for (k=N-1; (k >= 1) && (k > used || dist < best_dist[k-1]); k--)

         {

            best_dist[k]=best_dist[k-1];

            nbest[k] = nbest[k-1];

         }

         best_dist[k]=dist;

         nbest[k]=i;

         used++;

      }

   }

}

#endif /* !defined(OVERRIDE_VQ_NBEST) && !defined(DISABLE_ENCODER) */

#if !defined(OVERRIDE_VQ_NBEST_SIGN) && !defined(DISABLE_WIDEBAND) && !defined(DISABLE_ENCODER)

/*Finds the indices of the n-best entries in a codebook with sign*/

void vq_nbest_sign(spx_word16_t *in, const spx_word16_t *codebook, int len, int entries, spx_word32_t *E, int N, int *nbest, spx_word32_t *best_dist, char *stack)

{

   int i,j,k, sign, used;

   used=0;

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

   {

      spx_word32_t dist=0;

      for (j=0;j<len;j++)

         dist = MAC16_16(dist,in[j],*codebook++);

      if (dist>0)

      {

         sign=0;

         dist=-dist;

      } else

      {

         sign=1;

      }

#ifdef FIXED_POINT

      dist = ADD32(dist,SHR32(E[i],1));

#else

      dist = ADD32(dist,.5f*E[i]);

#endif

      if (i<N || dist<best_dist[N-1])

      {

         for (k=N-1; (k >= 1) && (k > used || dist < best_dist[k-1]); k--)

         {

            best_dist[k]=best_dist[k-1];

            nbest[k] = nbest[k-1];

         }

         best_dist[k]=dist;

         nbest[k]=i;

         used++;

         if (sign)

            nbest[k]+=entries;

      }

   }

}

#endif /* !defined(OVERRIDE_VQ_NBEST_SIGN) && !defined(DISABLE_WIDEBAND) && !defined(DISABLE_ENCODER) */