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/* 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
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;
}
#ifndef OVERRIDE_VQ_NBEST
/*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
#ifndef OVERRIDE_VQ_NBEST_SIGN
/*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
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