148 lines
4 KiB
C
148 lines
4 KiB
C
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/* Copyright (C) 2002 Jean-Marc Valin
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File: vq.c
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Vector quantization
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of the Xiph.org Foundation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "vq.h"
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#include "stack_alloc.h"
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#include "arch.h"
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#ifdef _USE_SSE
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#include <xmmintrin.h>
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#include "vq_sse.h"
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#elif defined(SHORTCUTS) && (defined(ARM4_ASM) || defined(ARM5E_ASM))
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#include "vq_arm4.h"
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#elif defined(BFIN_ASM)
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#include "vq_bfin.h"
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#endif
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int scal_quant(spx_word16_t in, const spx_word16_t *boundary, int entries)
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{
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int i=0;
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while (i<entries-1 && in>boundary[0])
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{
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boundary++;
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i++;
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}
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return i;
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}
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int scal_quant32(spx_word32_t in, const spx_word32_t *boundary, int entries)
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{
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int i=0;
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while (i<entries-1 && in>boundary[0])
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{
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boundary++;
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i++;
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}
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return i;
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}
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#ifndef OVERRIDE_VQ_NBEST
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/*Finds the indices of the n-best entries in a codebook*/
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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)
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{
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int i,j,k,used;
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used = 0;
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for (i=0;i<entries;i++)
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{
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spx_word32_t dist=0;
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for (j=0;j<len;j++)
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dist = MAC16_16(dist,in[j],*codebook++);
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#ifdef FIXED_POINT
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dist=SUB32(SHR32(E[i],1),dist);
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#else
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dist=.5f*E[i]-dist;
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#endif
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if (i<N || dist<best_dist[N-1])
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{
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for (k=N-1; (k >= 1) && (k > used || dist < best_dist[k-1]); k--)
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{
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best_dist[k]=best_dist[k-1];
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nbest[k] = nbest[k-1];
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}
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best_dist[k]=dist;
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nbest[k]=i;
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used++;
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}
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}
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}
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#endif
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#ifndef OVERRIDE_VQ_NBEST_SIGN
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/*Finds the indices of the n-best entries in a codebook with sign*/
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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)
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{
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int i,j,k, sign, used;
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used=0;
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for (i=0;i<entries;i++)
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{
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spx_word32_t dist=0;
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for (j=0;j<len;j++)
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dist = MAC16_16(dist,in[j],*codebook++);
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if (dist>0)
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{
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sign=0;
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dist=-dist;
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} else
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{
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sign=1;
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}
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#ifdef FIXED_POINT
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dist = ADD32(dist,SHR32(E[i],1));
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#else
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dist = ADD32(dist,.5f*E[i]);
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#endif
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if (i<N || dist<best_dist[N-1])
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{
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for (k=N-1; (k >= 1) && (k > used || dist < best_dist[k-1]); k--)
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{
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best_dist[k]=best_dist[k-1];
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nbest[k] = nbest[k-1];
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}
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best_dist[k]=dist;
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nbest[k]=i;
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used++;
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if (sign)
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nbest[k]+=entries;
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}
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}
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}
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#endif
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