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386 lines
9.6 KiB
C
386 lines
9.6 KiB
C
/* Copyright (C) 2002 Jean-Marc Valin
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File: quant_lsp.c
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LSP 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 "quant_lsp.h"
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#include "os_support.h"
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#include <math.h>
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#ifndef M_PI
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#define M_PI 3.14159265358979323846
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#endif
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#include "arch.h"
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#ifdef BFIN_ASM
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#include "quant_lsp_bfin.h"
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#endif
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#ifdef FIXED_POINT
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#define LSP_LINEAR(i) (SHL16(i+1,11))
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#define LSP_LINEAR_HIGH(i) (ADD16(MULT16_16_16(i,2560),6144))
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#define LSP_DIV_256(x) (SHL16((spx_word16_t)x, 5))
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#define LSP_DIV_512(x) (SHL16((spx_word16_t)x, 4))
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#define LSP_DIV_1024(x) (SHL16((spx_word16_t)x, 3))
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#define LSP_PI 25736
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#else
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#define LSP_LINEAR(i) (.25*(i)+.25)
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#define LSP_LINEAR_HIGH(i) (.3125*(i)+.75)
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#define LSP_SCALE 256.
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#define LSP_DIV_256(x) (0.0039062*(x))
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#define LSP_DIV_512(x) (0.0019531*(x))
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#define LSP_DIV_1024(x) (0.00097656*(x))
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#define LSP_PI M_PI
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#endif
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static void compute_quant_weights(spx_lsp_t *qlsp, spx_word16_t *quant_weight, int order)
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{
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int i;
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spx_word16_t tmp1, tmp2;
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for (i=0;i<order;i++)
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{
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if (i==0)
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tmp1 = qlsp[i];
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else
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tmp1 = qlsp[i]-qlsp[i-1];
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if (i==order-1)
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tmp2 = LSP_PI-qlsp[i];
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else
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tmp2 = qlsp[i+1]-qlsp[i];
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if (tmp2<tmp1)
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tmp1 = tmp2;
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#ifdef FIXED_POINT
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quant_weight[i] = DIV32_16(81920,ADD16(300,tmp1));
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#else
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quant_weight[i] = 10/(.04+tmp1);
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#endif
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}
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}
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/* Note: x is modified*/
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#ifndef OVERRIDE_LSP_QUANT
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static int lsp_quant(spx_word16_t *x, const signed char *cdbk, int nbVec, int nbDim)
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{
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int i,j;
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spx_word32_t dist;
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spx_word16_t tmp;
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spx_word32_t best_dist=VERY_LARGE32;
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int best_id=0;
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const signed char *ptr=cdbk;
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for (i=0;i<nbVec;i++)
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{
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dist=0;
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for (j=0;j<nbDim;j++)
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{
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tmp=SUB16(x[j],SHL16((spx_word16_t)*ptr++,5));
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dist=MAC16_16(dist,tmp,tmp);
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}
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if (dist<best_dist)
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{
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best_dist=dist;
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best_id=i;
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}
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}
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for (j=0;j<nbDim;j++)
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x[j] = SUB16(x[j],SHL16((spx_word16_t)cdbk[best_id*nbDim+j],5));
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return best_id;
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}
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#endif
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/* Note: x is modified*/
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#ifndef OVERRIDE_LSP_WEIGHT_QUANT
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static int lsp_weight_quant(spx_word16_t *x, spx_word16_t *weight, const signed char *cdbk, int nbVec, int nbDim)
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{
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int i,j;
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spx_word32_t dist;
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spx_word16_t tmp;
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spx_word32_t best_dist=VERY_LARGE32;
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int best_id=0;
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const signed char *ptr=cdbk;
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for (i=0;i<nbVec;i++)
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{
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dist=0;
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for (j=0;j<nbDim;j++)
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{
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tmp=SUB16(x[j],SHL16((spx_word16_t)*ptr++,5));
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dist=MAC16_32_Q15(dist,weight[j],MULT16_16(tmp,tmp));
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}
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if (dist<best_dist)
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{
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best_dist=dist;
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best_id=i;
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}
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}
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for (j=0;j<nbDim;j++)
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x[j] = SUB16(x[j],SHL16((spx_word16_t)cdbk[best_id*nbDim+j],5));
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return best_id;
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}
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#endif
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void lsp_quant_nb(spx_lsp_t *lsp, spx_lsp_t *qlsp, int order, SpeexBits *bits)
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{
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int i;
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int id;
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spx_word16_t quant_weight[10];
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for (i=0;i<order;i++)
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qlsp[i]=lsp[i];
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compute_quant_weights(qlsp, quant_weight, order);
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for (i=0;i<order;i++)
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qlsp[i]=SUB16(qlsp[i],LSP_LINEAR(i));
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#ifndef FIXED_POINT
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for (i=0;i<order;i++)
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qlsp[i] = LSP_SCALE*qlsp[i];
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#endif
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id = lsp_quant(qlsp, cdbk_nb, NB_CDBK_SIZE, order);
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speex_bits_pack(bits, id, 6);
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for (i=0;i<order;i++)
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qlsp[i]*=2;
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id = lsp_weight_quant(qlsp, quant_weight, cdbk_nb_low1, NB_CDBK_SIZE_LOW1, 5);
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speex_bits_pack(bits, id, 6);
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for (i=0;i<5;i++)
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qlsp[i]*=2;
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id = lsp_weight_quant(qlsp, quant_weight, cdbk_nb_low2, NB_CDBK_SIZE_LOW2, 5);
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speex_bits_pack(bits, id, 6);
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id = lsp_weight_quant(qlsp+5, quant_weight+5, cdbk_nb_high1, NB_CDBK_SIZE_HIGH1, 5);
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speex_bits_pack(bits, id, 6);
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for (i=5;i<10;i++)
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qlsp[i]*=2;
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id = lsp_weight_quant(qlsp+5, quant_weight+5, cdbk_nb_high2, NB_CDBK_SIZE_HIGH2, 5);
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speex_bits_pack(bits, id, 6);
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#ifdef FIXED_POINT
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for (i=0;i<order;i++)
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qlsp[i]=PSHR16(qlsp[i],2);
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#else
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for (i=0;i<order;i++)
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qlsp[i]=qlsp[i] * .00097656;
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#endif
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for (i=0;i<order;i++)
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qlsp[i]=lsp[i]-qlsp[i];
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}
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void lsp_unquant_nb(spx_lsp_t *lsp, int order, SpeexBits *bits)
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{
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int i, id;
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for (i=0;i<order;i++)
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lsp[i]=LSP_LINEAR(i);
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id=speex_bits_unpack_unsigned(bits, 6);
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for (i=0;i<10;i++)
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lsp[i] = ADD32(lsp[i], LSP_DIV_256(cdbk_nb[id*10+i]));
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id=speex_bits_unpack_unsigned(bits, 6);
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for (i=0;i<5;i++)
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lsp[i] = ADD16(lsp[i], LSP_DIV_512(cdbk_nb_low1[id*5+i]));
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id=speex_bits_unpack_unsigned(bits, 6);
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for (i=0;i<5;i++)
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lsp[i] = ADD32(lsp[i], LSP_DIV_1024(cdbk_nb_low2[id*5+i]));
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id=speex_bits_unpack_unsigned(bits, 6);
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for (i=0;i<5;i++)
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lsp[i+5] = ADD32(lsp[i+5], LSP_DIV_512(cdbk_nb_high1[id*5+i]));
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id=speex_bits_unpack_unsigned(bits, 6);
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for (i=0;i<5;i++)
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lsp[i+5] = ADD32(lsp[i+5], LSP_DIV_1024(cdbk_nb_high2[id*5+i]));
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}
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void lsp_quant_lbr(spx_lsp_t *lsp, spx_lsp_t *qlsp, int order, SpeexBits *bits)
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{
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int i;
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int id;
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spx_word16_t quant_weight[10];
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for (i=0;i<order;i++)
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qlsp[i]=lsp[i];
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compute_quant_weights(qlsp, quant_weight, order);
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for (i=0;i<order;i++)
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qlsp[i]=SUB16(qlsp[i],LSP_LINEAR(i));
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#ifndef FIXED_POINT
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for (i=0;i<order;i++)
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qlsp[i]=qlsp[i]*LSP_SCALE;
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#endif
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id = lsp_quant(qlsp, cdbk_nb, NB_CDBK_SIZE, order);
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speex_bits_pack(bits, id, 6);
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for (i=0;i<order;i++)
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qlsp[i]*=2;
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id = lsp_weight_quant(qlsp, quant_weight, cdbk_nb_low1, NB_CDBK_SIZE_LOW1, 5);
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speex_bits_pack(bits, id, 6);
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id = lsp_weight_quant(qlsp+5, quant_weight+5, cdbk_nb_high1, NB_CDBK_SIZE_HIGH1, 5);
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speex_bits_pack(bits, id, 6);
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#ifdef FIXED_POINT
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for (i=0;i<order;i++)
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qlsp[i] = PSHR16(qlsp[i],1);
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#else
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for (i=0;i<order;i++)
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qlsp[i] = qlsp[i]*0.0019531;
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#endif
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for (i=0;i<order;i++)
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qlsp[i]=lsp[i]-qlsp[i];
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}
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void lsp_unquant_lbr(spx_lsp_t *lsp, int order, SpeexBits *bits)
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{
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int i, id;
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for (i=0;i<order;i++)
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lsp[i]=LSP_LINEAR(i);
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id=speex_bits_unpack_unsigned(bits, 6);
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for (i=0;i<10;i++)
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lsp[i] += LSP_DIV_256(cdbk_nb[id*10+i]);
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id=speex_bits_unpack_unsigned(bits, 6);
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for (i=0;i<5;i++)
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lsp[i] += LSP_DIV_512(cdbk_nb_low1[id*5+i]);
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id=speex_bits_unpack_unsigned(bits, 6);
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for (i=0;i<5;i++)
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lsp[i+5] += LSP_DIV_512(cdbk_nb_high1[id*5+i]);
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}
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#ifdef DISABLE_WIDEBAND
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void lsp_quant_high(spx_lsp_t *lsp, spx_lsp_t *qlsp, int order, SpeexBits *bits)
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{
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speex_fatal("Wideband and Ultra-wideband are disabled");
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}
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void lsp_unquant_high(spx_lsp_t *lsp, int order, SpeexBits *bits)
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{
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speex_fatal("Wideband and Ultra-wideband are disabled");
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}
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#else
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extern const signed char high_lsp_cdbk[];
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extern const signed char high_lsp_cdbk2[];
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void lsp_quant_high(spx_lsp_t *lsp, spx_lsp_t *qlsp, int order, SpeexBits *bits)
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{
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int i;
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int id;
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spx_word16_t quant_weight[10];
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for (i=0;i<order;i++)
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qlsp[i]=lsp[i];
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compute_quant_weights(qlsp, quant_weight, order);
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/* quant_weight[0] = 10/(qlsp[1]-qlsp[0]);
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quant_weight[order-1] = 10/(qlsp[order-1]-qlsp[order-2]);
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for (i=1;i<order-1;i++)
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{
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tmp1 = 10/(qlsp[i]-qlsp[i-1]);
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tmp2 = 10/(qlsp[i+1]-qlsp[i]);
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quant_weight[i] = tmp1 > tmp2 ? tmp1 : tmp2;
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}*/
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for (i=0;i<order;i++)
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qlsp[i]=SUB16(qlsp[i],LSP_LINEAR_HIGH(i));
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#ifndef FIXED_POINT
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for (i=0;i<order;i++)
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qlsp[i] = qlsp[i]*LSP_SCALE;
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#endif
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id = lsp_quant(qlsp, high_lsp_cdbk, 64, order);
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speex_bits_pack(bits, id, 6);
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for (i=0;i<order;i++)
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qlsp[i]*=2;
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id = lsp_weight_quant(qlsp, quant_weight, high_lsp_cdbk2, 64, order);
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speex_bits_pack(bits, id, 6);
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#ifdef FIXED_POINT
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for (i=0;i<order;i++)
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qlsp[i] = PSHR16(qlsp[i],1);
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#else
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for (i=0;i<order;i++)
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qlsp[i] = qlsp[i]*0.0019531;
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#endif
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for (i=0;i<order;i++)
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qlsp[i]=lsp[i]-qlsp[i];
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}
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void lsp_unquant_high(spx_lsp_t *lsp, int order, SpeexBits *bits)
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{
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int i, id;
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for (i=0;i<order;i++)
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lsp[i]=LSP_LINEAR_HIGH(i);
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id=speex_bits_unpack_unsigned(bits, 6);
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for (i=0;i<order;i++)
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lsp[i] += LSP_DIV_256(high_lsp_cdbk[id*order+i]);
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id=speex_bits_unpack_unsigned(bits, 6);
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for (i=0;i<order;i++)
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lsp[i] += LSP_DIV_512(high_lsp_cdbk2[id*order+i]);
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}
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#endif
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