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1 /* Copyright (C) 2002 Jean-Marc Valin
2    File: vq.c
3    Vector quantization
4 
5    Redistribution and use in source and binary forms, with or without
6    modification, are permitted provided that the following conditions
7    are met:
8 
9    - Redistributions of source code must retain the above copyright
10    notice, this list of conditions and the following disclaimer.
11 
12    - Redistributions in binary form must reproduce the above copyright
13    notice, this list of conditions and the following disclaimer in the
14    documentation and/or other materials provided with the distribution.
15 
16    - Neither the name of the Xiph.org Foundation nor the names of its
17    contributors may be used to endorse or promote products derived from
18    this software without specific prior written permission.
19 
20    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23    A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
24    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
25    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
26    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
27    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
28    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
29    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32 
33 #ifdef HAVE_CONFIG_H
34 #include "config.h"
35 #endif
36 
37 #include "vq.h"
38 #include "stack_alloc.h"
39 #include "arch.h"
40 
41 #ifdef _USE_SSE
42 #include <xmmintrin.h>
43 #include "vq_sse.h"
44 #elif defined(SHORTCUTS) && (defined(ARM4_ASM) || defined(ARM5E_ASM))
45 #include "vq_arm4.h"
46 #elif defined(BFIN_ASM)
47 #include "vq_bfin.h"
48 #endif
49 
50 
scal_quant(spx_word16_t in,const spx_word16_t * boundary,int entries)51 int scal_quant(spx_word16_t in, const spx_word16_t *boundary, int entries)
52 {
53    int i=0;
54    while (i<entries-1 && in>boundary[0])
55    {
56       boundary++;
57       i++;
58    }
59    return i;
60 }
61 
scal_quant32(spx_word32_t in,const spx_word32_t * boundary,int entries)62 int scal_quant32(spx_word32_t in, const spx_word32_t *boundary, int entries)
63 {
64    int i=0;
65    while (i<entries-1 && in>boundary[0])
66    {
67       boundary++;
68       i++;
69    }
70    return i;
71 }
72 
73 
74 #ifndef OVERRIDE_VQ_NBEST
75 /*Finds the indices of the n-best entries in a codebook*/
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)76 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)
77 {
78    int i,j,k,used;
79    used = 0;
80    for (i=0;i<entries;i++)
81    {
82       spx_word32_t dist=0;
83       for (j=0;j<len;j++)
84          dist = MAC16_16(dist,in[j],*codebook++);
85 #ifdef FIXED_POINT
86       dist=SUB32(SHR32(E[i],1),dist);
87 #else
88       dist=.5f*E[i]-dist;
89 #endif
90       if (i<N || dist<best_dist[N-1])
91       {
92          for (k=N-1; (k >= 1) && (k > used || dist < best_dist[k-1]); k--)
93          {
94             best_dist[k]=best_dist[k-1];
95             nbest[k] = nbest[k-1];
96          }
97          best_dist[k]=dist;
98          nbest[k]=i;
99          used++;
100       }
101    }
102 }
103 #endif
104 
105 
106 
107 
108 #ifndef OVERRIDE_VQ_NBEST_SIGN
109 /*Finds the indices of the n-best entries in a codebook with sign*/
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)110 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)
111 {
112    int i,j,k, sign, used;
113    used=0;
114    for (i=0;i<entries;i++)
115    {
116       spx_word32_t dist=0;
117       for (j=0;j<len;j++)
118          dist = MAC16_16(dist,in[j],*codebook++);
119       if (dist>0)
120       {
121          sign=0;
122          dist=-dist;
123       } else
124       {
125          sign=1;
126       }
127 #ifdef FIXED_POINT
128       dist = ADD32(dist,SHR32(E[i],1));
129 #else
130       dist = ADD32(dist,.5f*E[i]);
131 #endif
132       if (i<N || dist<best_dist[N-1])
133       {
134          for (k=N-1; (k >= 1) && (k > used || dist < best_dist[k-1]); k--)
135          {
136             best_dist[k]=best_dist[k-1];
137             nbest[k] = nbest[k-1];
138          }
139          best_dist[k]=dist;
140          nbest[k]=i;
141          used++;
142          if (sign)
143             nbest[k]+=entries;
144       }
145    }
146 }
147 #endif
148