1 /* Copyright (C) 2002 Jean-Marc Valin
3 LSP vector quantization
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37 #include "quant_lsp.h"
38 #include "os_support.h"
41 #define M_PI 3.14159265358979323846
47 #include "quant_lsp_bfin.h"
52 #define LSP_LINEAR(i) (SHL16(i+1,11))
53 #define LSP_LINEAR_HIGH(i) (ADD16(MULT16_16_16(i,2560),6144))
54 #define LSP_DIV_256(x) (SHL16((spx_word16_t)x, 5))
55 #define LSP_DIV_512(x) (SHL16((spx_word16_t)x, 4))
56 #define LSP_DIV_1024(x) (SHL16((spx_word16_t)x, 3))
61 #define LSP_LINEAR(i) (.25*(i)+.25)
62 #define LSP_LINEAR_HIGH(i) (.3125*(i)+.75)
63 #define LSP_SCALE 256.
64 #define LSP_DIV_256(x) (0.0039062*(x))
65 #define LSP_DIV_512(x) (0.0019531*(x))
66 #define LSP_DIV_1024(x) (0.00097656*(x))
71 static void compute_quant_weights(spx_lsp_t *qlsp, spx_word16_t *quant_weight, int order)
74 spx_word16_t tmp1, tmp2;
80 tmp1 = qlsp[i]-qlsp[i-1];
82 tmp2 = LSP_PI-qlsp[i];
84 tmp2 = qlsp[i+1]-qlsp[i];
88 quant_weight[i] = DIV32_16(81920,ADD16(300,tmp1));
90 quant_weight[i] = 10/(.04+tmp1);
96 /* Note: x is modified*/
97 #ifndef OVERRIDE_LSP_QUANT
98 static int lsp_quant(spx_word16_t *x, const signed char *cdbk, int nbVec, int nbDim)
103 spx_word32_t best_dist=VERY_LARGE32;
105 const signed char *ptr=cdbk;
106 for (i=0;i<nbVec;i++)
109 for (j=0;j<nbDim;j++)
111 tmp=SUB16(x[j],SHL16((spx_word16_t)*ptr++,5));
112 dist=MAC16_16(dist,tmp,tmp);
121 for (j=0;j<nbDim;j++)
122 x[j] = SUB16(x[j],SHL16((spx_word16_t)cdbk[best_id*nbDim+j],5));
128 /* Note: x is modified*/
129 #ifndef OVERRIDE_LSP_WEIGHT_QUANT
130 static int lsp_weight_quant(spx_word16_t *x, spx_word16_t *weight, const signed char *cdbk, int nbVec, int nbDim)
135 spx_word32_t best_dist=VERY_LARGE32;
137 const signed char *ptr=cdbk;
138 for (i=0;i<nbVec;i++)
141 for (j=0;j<nbDim;j++)
143 tmp=SUB16(x[j],SHL16((spx_word16_t)*ptr++,5));
144 dist=MAC16_32_Q15(dist,weight[j],MULT16_16(tmp,tmp));
153 for (j=0;j<nbDim;j++)
154 x[j] = SUB16(x[j],SHL16((spx_word16_t)cdbk[best_id*nbDim+j],5));
159 void lsp_quant_nb(spx_lsp_t *lsp, spx_lsp_t *qlsp, int order, SpeexBits *bits)
163 spx_word16_t quant_weight[10];
165 for (i=0;i<order;i++)
168 compute_quant_weights(qlsp, quant_weight, order);
170 for (i=0;i<order;i++)
171 qlsp[i]=SUB16(qlsp[i],LSP_LINEAR(i));
174 for (i=0;i<order;i++)
175 qlsp[i] = LSP_SCALE*qlsp[i];
177 id = lsp_quant(qlsp, cdbk_nb, NB_CDBK_SIZE, order);
178 speex_bits_pack(bits, id, 6);
180 for (i=0;i<order;i++)
183 id = lsp_weight_quant(qlsp, quant_weight, cdbk_nb_low1, NB_CDBK_SIZE_LOW1, 5);
184 speex_bits_pack(bits, id, 6);
189 id = lsp_weight_quant(qlsp, quant_weight, cdbk_nb_low2, NB_CDBK_SIZE_LOW2, 5);
190 speex_bits_pack(bits, id, 6);
192 id = lsp_weight_quant(qlsp+5, quant_weight+5, cdbk_nb_high1, NB_CDBK_SIZE_HIGH1, 5);
193 speex_bits_pack(bits, id, 6);
198 id = lsp_weight_quant(qlsp+5, quant_weight+5, cdbk_nb_high2, NB_CDBK_SIZE_HIGH2, 5);
199 speex_bits_pack(bits, id, 6);
202 for (i=0;i<order;i++)
203 qlsp[i]=PSHR16(qlsp[i],2);
205 for (i=0;i<order;i++)
206 qlsp[i]=qlsp[i] * .00097656;
209 for (i=0;i<order;i++)
210 qlsp[i]=lsp[i]-qlsp[i];
213 void lsp_unquant_nb(spx_lsp_t *lsp, int order, SpeexBits *bits)
216 for (i=0;i<order;i++)
217 lsp[i]=LSP_LINEAR(i);
220 id=speex_bits_unpack_unsigned(bits, 6);
222 lsp[i] = ADD32(lsp[i], LSP_DIV_256(cdbk_nb[id*10+i]));
224 id=speex_bits_unpack_unsigned(bits, 6);
226 lsp[i] = ADD16(lsp[i], LSP_DIV_512(cdbk_nb_low1[id*5+i]));
228 id=speex_bits_unpack_unsigned(bits, 6);
230 lsp[i] = ADD32(lsp[i], LSP_DIV_1024(cdbk_nb_low2[id*5+i]));
232 id=speex_bits_unpack_unsigned(bits, 6);
234 lsp[i+5] = ADD32(lsp[i+5], LSP_DIV_512(cdbk_nb_high1[id*5+i]));
236 id=speex_bits_unpack_unsigned(bits, 6);
238 lsp[i+5] = ADD32(lsp[i+5], LSP_DIV_1024(cdbk_nb_high2[id*5+i]));
242 void lsp_quant_lbr(spx_lsp_t *lsp, spx_lsp_t *qlsp, int order, SpeexBits *bits)
246 spx_word16_t quant_weight[10];
248 for (i=0;i<order;i++)
251 compute_quant_weights(qlsp, quant_weight, order);
253 for (i=0;i<order;i++)
254 qlsp[i]=SUB16(qlsp[i],LSP_LINEAR(i));
256 for (i=0;i<order;i++)
257 qlsp[i]=qlsp[i]*LSP_SCALE;
259 id = lsp_quant(qlsp, cdbk_nb, NB_CDBK_SIZE, order);
260 speex_bits_pack(bits, id, 6);
262 for (i=0;i<order;i++)
265 id = lsp_weight_quant(qlsp, quant_weight, cdbk_nb_low1, NB_CDBK_SIZE_LOW1, 5);
266 speex_bits_pack(bits, id, 6);
268 id = lsp_weight_quant(qlsp+5, quant_weight+5, cdbk_nb_high1, NB_CDBK_SIZE_HIGH1, 5);
269 speex_bits_pack(bits, id, 6);
272 for (i=0;i<order;i++)
273 qlsp[i] = PSHR16(qlsp[i],1);
275 for (i=0;i<order;i++)
276 qlsp[i] = qlsp[i]*0.0019531;
279 for (i=0;i<order;i++)
280 qlsp[i]=lsp[i]-qlsp[i];
283 void lsp_unquant_lbr(spx_lsp_t *lsp, int order, SpeexBits *bits)
286 for (i=0;i<order;i++)
287 lsp[i]=LSP_LINEAR(i);
290 id=speex_bits_unpack_unsigned(bits, 6);
292 lsp[i] += LSP_DIV_256(cdbk_nb[id*10+i]);
294 id=speex_bits_unpack_unsigned(bits, 6);
296 lsp[i] += LSP_DIV_512(cdbk_nb_low1[id*5+i]);
298 id=speex_bits_unpack_unsigned(bits, 6);
300 lsp[i+5] += LSP_DIV_512(cdbk_nb_high1[id*5+i]);
305 #ifdef DISABLE_WIDEBAND
306 void lsp_quant_high(spx_lsp_t *lsp, spx_lsp_t *qlsp, int order, SpeexBits *bits)
308 speex_fatal("Wideband and Ultra-wideband are disabled");
310 void lsp_unquant_high(spx_lsp_t *lsp, int order, SpeexBits *bits)
312 speex_fatal("Wideband and Ultra-wideband are disabled");
315 extern const signed char high_lsp_cdbk[];
316 extern const signed char high_lsp_cdbk2[];
319 void lsp_quant_high(spx_lsp_t *lsp, spx_lsp_t *qlsp, int order, SpeexBits *bits)
323 spx_word16_t quant_weight[10];
325 for (i=0;i<order;i++)
328 compute_quant_weights(qlsp, quant_weight, order);
330 /* quant_weight[0] = 10/(qlsp[1]-qlsp[0]);
331 quant_weight[order-1] = 10/(qlsp[order-1]-qlsp[order-2]);
332 for (i=1;i<order-1;i++)
334 tmp1 = 10/(qlsp[i]-qlsp[i-1]);
335 tmp2 = 10/(qlsp[i+1]-qlsp[i]);
336 quant_weight[i] = tmp1 > tmp2 ? tmp1 : tmp2;
339 for (i=0;i<order;i++)
340 qlsp[i]=SUB16(qlsp[i],LSP_LINEAR_HIGH(i));
342 for (i=0;i<order;i++)
343 qlsp[i] = qlsp[i]*LSP_SCALE;
345 id = lsp_quant(qlsp, high_lsp_cdbk, 64, order);
346 speex_bits_pack(bits, id, 6);
348 for (i=0;i<order;i++)
351 id = lsp_weight_quant(qlsp, quant_weight, high_lsp_cdbk2, 64, order);
352 speex_bits_pack(bits, id, 6);
355 for (i=0;i<order;i++)
356 qlsp[i] = PSHR16(qlsp[i],1);
358 for (i=0;i<order;i++)
359 qlsp[i] = qlsp[i]*0.0019531;
362 for (i=0;i<order;i++)
363 qlsp[i]=lsp[i]-qlsp[i];
366 void lsp_unquant_high(spx_lsp_t *lsp, int order, SpeexBits *bits)
370 for (i=0;i<order;i++)
371 lsp[i]=LSP_LINEAR_HIGH(i);
374 id=speex_bits_unpack_unsigned(bits, 6);
375 for (i=0;i<order;i++)
376 lsp[i] += LSP_DIV_256(high_lsp_cdbk[id*order+i]);
379 id=speex_bits_unpack_unsigned(bits, 6);
380 for (i=0;i<order;i++)
381 lsp[i] += LSP_DIV_512(high_lsp_cdbk2[id*order+i]);