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| 1 /* Copyright (C) 2002-2006 Jean-Marc Valin |
| 2 File: ltp.c |
| 3 Long-Term Prediction functions |
| 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 <math.h> |
| 38 #include "ltp.h" |
| 39 #include "stack_alloc.h" |
| 40 #include "filters.h" |
| 41 #include <speex/speex_bits.h> |
| 42 #include "math_approx.h" |
| 43 #include "os_support.h" |
| 44 |
| 45 #ifndef NULL |
| 46 #define NULL 0 |
| 47 #endif |
| 48 |
| 49 |
| 50 #ifdef _USE_SSE |
| 51 #include "ltp_sse.h" |
| 52 #elif defined (ARM4_ASM) || defined(ARM5E_ASM) |
| 53 #include "ltp_arm4.h" |
| 54 #elif defined (BFIN_ASM) |
| 55 #include "ltp_bfin.h" |
| 56 #endif |
| 57 |
| 58 #ifndef OVERRIDE_INNER_PROD |
| 59 spx_word32_t inner_prod(const spx_word16_t *x, const spx_word16_t *y, int len) |
| 60 { |
| 61 spx_word32_t sum=0; |
| 62 len >>= 2; |
| 63 while(len--) |
| 64 { |
| 65 spx_word32_t part=0; |
| 66 part = MAC16_16(part,*x++,*y++); |
| 67 part = MAC16_16(part,*x++,*y++); |
| 68 part = MAC16_16(part,*x++,*y++); |
| 69 part = MAC16_16(part,*x++,*y++); |
| 70 /* HINT: If you had a 40-bit accumulator, you could shift only at the end
*/ |
| 71 sum = ADD32(sum,SHR32(part,6)); |
| 72 } |
| 73 return sum; |
| 74 } |
| 75 #endif |
| 76 |
| 77 #ifndef OVERRIDE_PITCH_XCORR |
| 78 #if 0 /* HINT: Enable this for machines with enough registers (i.e. not x86) */ |
| 79 void pitch_xcorr(const spx_word16_t *_x, const spx_word16_t *_y, spx_word32_t *c
orr, int len, int nb_pitch, char *stack) |
| 80 { |
| 81 int i,j; |
| 82 for (i=0;i<nb_pitch;i+=4) |
| 83 { |
| 84 /* Compute correlation*/ |
| 85 /*corr[nb_pitch-1-i]=inner_prod(x, _y+i, len);*/ |
| 86 spx_word32_t sum1=0; |
| 87 spx_word32_t sum2=0; |
| 88 spx_word32_t sum3=0; |
| 89 spx_word32_t sum4=0; |
| 90 const spx_word16_t *y = _y+i; |
| 91 const spx_word16_t *x = _x; |
| 92 spx_word16_t y0, y1, y2, y3; |
| 93 /*y0=y[0];y1=y[1];y2=y[2];y3=y[3];*/ |
| 94 y0=*y++; |
| 95 y1=*y++; |
| 96 y2=*y++; |
| 97 y3=*y++; |
| 98 for (j=0;j<len;j+=4) |
| 99 { |
| 100 spx_word32_t part1; |
| 101 spx_word32_t part2; |
| 102 spx_word32_t part3; |
| 103 spx_word32_t part4; |
| 104 part1 = MULT16_16(*x,y0); |
| 105 part2 = MULT16_16(*x,y1); |
| 106 part3 = MULT16_16(*x,y2); |
| 107 part4 = MULT16_16(*x,y3); |
| 108 x++; |
| 109 y0=*y++; |
| 110 part1 = MAC16_16(part1,*x,y1); |
| 111 part2 = MAC16_16(part2,*x,y2); |
| 112 part3 = MAC16_16(part3,*x,y3); |
| 113 part4 = MAC16_16(part4,*x,y0); |
| 114 x++; |
| 115 y1=*y++; |
| 116 part1 = MAC16_16(part1,*x,y2); |
| 117 part2 = MAC16_16(part2,*x,y3); |
| 118 part3 = MAC16_16(part3,*x,y0); |
| 119 part4 = MAC16_16(part4,*x,y1); |
| 120 x++; |
| 121 y2=*y++; |
| 122 part1 = MAC16_16(part1,*x,y3); |
| 123 part2 = MAC16_16(part2,*x,y0); |
| 124 part3 = MAC16_16(part3,*x,y1); |
| 125 part4 = MAC16_16(part4,*x,y2); |
| 126 x++; |
| 127 y3=*y++; |
| 128 |
| 129 sum1 = ADD32(sum1,SHR32(part1,6)); |
| 130 sum2 = ADD32(sum2,SHR32(part2,6)); |
| 131 sum3 = ADD32(sum3,SHR32(part3,6)); |
| 132 sum4 = ADD32(sum4,SHR32(part4,6)); |
| 133 } |
| 134 corr[nb_pitch-1-i]=sum1; |
| 135 corr[nb_pitch-2-i]=sum2; |
| 136 corr[nb_pitch-3-i]=sum3; |
| 137 corr[nb_pitch-4-i]=sum4; |
| 138 } |
| 139 |
| 140 } |
| 141 #else |
| 142 void pitch_xcorr(const spx_word16_t *_x, const spx_word16_t *_y, spx_word32_t *c
orr, int len, int nb_pitch, char *stack) |
| 143 { |
| 144 int i; |
| 145 for (i=0;i<nb_pitch;i++) |
| 146 { |
| 147 /* Compute correlation*/ |
| 148 corr[nb_pitch-1-i]=inner_prod(_x, _y+i, len); |
| 149 } |
| 150 |
| 151 } |
| 152 #endif |
| 153 #endif |
| 154 |
| 155 #ifndef OVERRIDE_COMPUTE_PITCH_ERROR |
| 156 static inline spx_word32_t compute_pitch_error(spx_word16_t *C, spx_word16_t *g,
spx_word16_t pitch_control) |
| 157 { |
| 158 spx_word32_t sum = 0; |
| 159 sum = ADD32(sum,MULT16_16(MULT16_16_16(g[0],pitch_control),C[0])); |
| 160 sum = ADD32(sum,MULT16_16(MULT16_16_16(g[1],pitch_control),C[1])); |
| 161 sum = ADD32(sum,MULT16_16(MULT16_16_16(g[2],pitch_control),C[2])); |
| 162 sum = SUB32(sum,MULT16_16(MULT16_16_16(g[0],g[1]),C[3])); |
| 163 sum = SUB32(sum,MULT16_16(MULT16_16_16(g[2],g[1]),C[4])); |
| 164 sum = SUB32(sum,MULT16_16(MULT16_16_16(g[2],g[0]),C[5])); |
| 165 sum = SUB32(sum,MULT16_16(MULT16_16_16(g[0],g[0]),C[6])); |
| 166 sum = SUB32(sum,MULT16_16(MULT16_16_16(g[1],g[1]),C[7])); |
| 167 sum = SUB32(sum,MULT16_16(MULT16_16_16(g[2],g[2]),C[8])); |
| 168 return sum; |
| 169 } |
| 170 #endif |
| 171 |
| 172 #ifndef OVERRIDE_OPEN_LOOP_NBEST_PITCH |
| 173 void open_loop_nbest_pitch(spx_word16_t *sw, int start, int end, int len, int *p
itch, spx_word16_t *gain, int N, char *stack) |
| 174 { |
| 175 int i,j,k; |
| 176 VARDECL(spx_word32_t *best_score); |
| 177 VARDECL(spx_word32_t *best_ener); |
| 178 spx_word32_t e0; |
| 179 VARDECL(spx_word32_t *corr); |
| 180 #ifdef FIXED_POINT |
| 181 /* In fixed-point, we need only one (temporary) array of 32-bit values and tw
o (corr16, ener16) |
| 182 arrays for (normalized) 16-bit values */ |
| 183 VARDECL(spx_word16_t *corr16); |
| 184 VARDECL(spx_word16_t *ener16); |
| 185 spx_word32_t *energy; |
| 186 int cshift=0, eshift=0; |
| 187 int scaledown = 0; |
| 188 ALLOC(corr16, end-start+1, spx_word16_t); |
| 189 ALLOC(ener16, end-start+1, spx_word16_t); |
| 190 ALLOC(corr, end-start+1, spx_word32_t); |
| 191 energy = corr; |
| 192 #else |
| 193 /* In floating-point, we need to float arrays and no normalized copies */ |
| 194 VARDECL(spx_word32_t *energy); |
| 195 spx_word16_t *corr16; |
| 196 spx_word16_t *ener16; |
| 197 ALLOC(energy, end-start+2, spx_word32_t); |
| 198 ALLOC(corr, end-start+1, spx_word32_t); |
| 199 corr16 = corr; |
| 200 ener16 = energy; |
| 201 #endif |
| 202 |
| 203 ALLOC(best_score, N, spx_word32_t); |
| 204 ALLOC(best_ener, N, spx_word32_t); |
| 205 for (i=0;i<N;i++) |
| 206 { |
| 207 best_score[i]=-1; |
| 208 best_ener[i]=0; |
| 209 pitch[i]=start; |
| 210 } |
| 211 |
| 212 #ifdef FIXED_POINT |
| 213 for (i=-end;i<len;i++) |
| 214 { |
| 215 if (ABS16(sw[i])>16383) |
| 216 { |
| 217 scaledown=1; |
| 218 break; |
| 219 } |
| 220 } |
| 221 /* If the weighted input is close to saturation, then we scale it down */ |
| 222 if (scaledown) |
| 223 { |
| 224 for (i=-end;i<len;i++) |
| 225 { |
| 226 sw[i]=SHR16(sw[i],1); |
| 227 } |
| 228 } |
| 229 #endif |
| 230 energy[0]=inner_prod(sw-start, sw-start, len); |
| 231 e0=inner_prod(sw, sw, len); |
| 232 for (i=start;i<end;i++) |
| 233 { |
| 234 /* Update energy for next pitch*/ |
| 235 energy[i-start+1] = SUB32(ADD32(energy[i-start],SHR32(MULT16_16(sw[-i-1],s
w[-i-1]),6)), SHR32(MULT16_16(sw[-i+len-1],sw[-i+len-1]),6)); |
| 236 if (energy[i-start+1] < 0) |
| 237 energy[i-start+1] = 0; |
| 238 } |
| 239 |
| 240 #ifdef FIXED_POINT |
| 241 eshift = normalize16(energy, ener16, 32766, end-start+1); |
| 242 #endif |
| 243 |
| 244 /* In fixed-point, this actually overrites the energy array (aliased to corr)
*/ |
| 245 pitch_xcorr(sw, sw-end, corr, len, end-start+1, stack); |
| 246 |
| 247 #ifdef FIXED_POINT |
| 248 /* Normalize to 180 so we can square it and it still fits in 16 bits */ |
| 249 cshift = normalize16(corr, corr16, 180, end-start+1); |
| 250 /* If we scaled weighted input down, we need to scale it up again (OK, so we'
ve just lost the LSB, who cares?) */ |
| 251 if (scaledown) |
| 252 { |
| 253 for (i=-end;i<len;i++) |
| 254 { |
| 255 sw[i]=SHL16(sw[i],1); |
| 256 } |
| 257 } |
| 258 #endif |
| 259 |
| 260 /* Search for the best pitch prediction gain */ |
| 261 for (i=start;i<=end;i++) |
| 262 { |
| 263 spx_word16_t tmp = MULT16_16_16(corr16[i-start],corr16[i-start]); |
| 264 /* Instead of dividing the tmp by the energy, we multiply on the other sid
e */ |
| 265 if (MULT16_16(tmp,best_ener[N-1])>MULT16_16(best_score[N-1],ADD16(1,ener16
[i-start]))) |
| 266 { |
| 267 /* We can safely put it last and then check */ |
| 268 best_score[N-1]=tmp; |
| 269 best_ener[N-1]=ener16[i-start]+1; |
| 270 pitch[N-1]=i; |
| 271 /* Check if it comes in front of others */ |
| 272 for (j=0;j<N-1;j++) |
| 273 { |
| 274 if (MULT16_16(tmp,best_ener[j])>MULT16_16(best_score[j],ADD16(1,ener
16[i-start]))) |
| 275 { |
| 276 for (k=N-1;k>j;k--) |
| 277 { |
| 278 best_score[k]=best_score[k-1]; |
| 279 best_ener[k]=best_ener[k-1]; |
| 280 pitch[k]=pitch[k-1]; |
| 281 } |
| 282 best_score[j]=tmp; |
| 283 best_ener[j]=ener16[i-start]+1; |
| 284 pitch[j]=i; |
| 285 break; |
| 286 } |
| 287 } |
| 288 } |
| 289 } |
| 290 |
| 291 /* Compute open-loop gain if necessary */ |
| 292 if (gain) |
| 293 { |
| 294 for (j=0;j<N;j++) |
| 295 { |
| 296 spx_word16_t g; |
| 297 i=pitch[j]; |
| 298 g = DIV32(SHL32(EXTEND32(corr16[i-start]),cshift), 10+SHR32(MULT16_16(s
px_sqrt(e0),spx_sqrt(SHL32(EXTEND32(ener16[i-start]),eshift))),6)); |
| 299 /* FIXME: g = max(g,corr/energy) */ |
| 300 if (g<0) |
| 301 g = 0; |
| 302 gain[j]=g; |
| 303 } |
| 304 } |
| 305 |
| 306 |
| 307 } |
| 308 #endif |
| 309 |
| 310 #ifndef OVERRIDE_PITCH_GAIN_SEARCH_3TAP_VQ |
| 311 static int pitch_gain_search_3tap_vq( |
| 312 const signed char *gain_cdbk, |
| 313 int gain_cdbk_size, |
| 314 spx_word16_t *C16, |
| 315 spx_word16_t max_gain |
| 316 ) |
| 317 { |
| 318 const signed char *ptr=gain_cdbk; |
| 319 int best_cdbk=0; |
| 320 spx_word32_t best_sum=-VERY_LARGE32; |
| 321 spx_word32_t sum=0; |
| 322 spx_word16_t g[3]; |
| 323 spx_word16_t pitch_control=64; |
| 324 spx_word16_t gain_sum; |
| 325 int i; |
| 326 |
| 327 for (i=0;i<gain_cdbk_size;i++) { |
| 328 |
| 329 ptr = gain_cdbk+4*i; |
| 330 g[0]=ADD16((spx_word16_t)ptr[0],32); |
| 331 g[1]=ADD16((spx_word16_t)ptr[1],32); |
| 332 g[2]=ADD16((spx_word16_t)ptr[2],32); |
| 333 gain_sum = (spx_word16_t)ptr[3]; |
| 334 |
| 335 sum = compute_pitch_error(C16, g, pitch_control); |
| 336 |
| 337 if (sum>best_sum && gain_sum<=max_gain) { |
| 338 best_sum=sum; |
| 339 best_cdbk=i; |
| 340 } |
| 341 } |
| 342 |
| 343 return best_cdbk; |
| 344 } |
| 345 #endif |
| 346 |
| 347 /** Finds the best quantized 3-tap pitch predictor by analysis by synthesis */ |
| 348 static spx_word32_t pitch_gain_search_3tap( |
| 349 const spx_word16_t target[], /* Target vector */ |
| 350 const spx_coef_t ak[], /* LPCs for this subframe */ |
| 351 const spx_coef_t awk1[], /* Weighted LPCs #1 for this subframe */ |
| 352 const spx_coef_t awk2[], /* Weighted LPCs #2 for this subframe */ |
| 353 spx_sig_t exc[], /* Excitation */ |
| 354 const signed char *gain_cdbk, |
| 355 int gain_cdbk_size, |
| 356 int pitch, /* Pitch value */ |
| 357 int p, /* Number of LPC coeffs */ |
| 358 int nsf, /* Number of samples in subframe */ |
| 359 SpeexBits *bits, |
| 360 char *stack, |
| 361 const spx_word16_t *exc2, |
| 362 const spx_word16_t *r, |
| 363 spx_word16_t *new_target, |
| 364 int *cdbk_index, |
| 365 int plc_tuning, |
| 366 spx_word32_t cumul_gain, |
| 367 int scaledown |
| 368 ) |
| 369 { |
| 370 int i,j; |
| 371 VARDECL(spx_word16_t *tmp1); |
| 372 VARDECL(spx_word16_t *e); |
| 373 spx_word16_t *x[3]; |
| 374 spx_word32_t corr[3]; |
| 375 spx_word32_t A[3][3]; |
| 376 spx_word16_t gain[3]; |
| 377 spx_word32_t err; |
| 378 spx_word16_t max_gain=128; |
| 379 int best_cdbk=0; |
| 380 |
| 381 ALLOC(tmp1, 3*nsf, spx_word16_t); |
| 382 ALLOC(e, nsf, spx_word16_t); |
| 383 |
| 384 if (cumul_gain > 262144) |
| 385 max_gain = 31; |
| 386 |
| 387 x[0]=tmp1; |
| 388 x[1]=tmp1+nsf; |
| 389 x[2]=tmp1+2*nsf; |
| 390 |
| 391 for (j=0;j<nsf;j++) |
| 392 new_target[j] = target[j]; |
| 393 |
| 394 { |
| 395 VARDECL(spx_mem_t *mm); |
| 396 int pp=pitch-1; |
| 397 ALLOC(mm, p, spx_mem_t); |
| 398 for (j=0;j<nsf;j++) |
| 399 { |
| 400 if (j-pp<0) |
| 401 e[j]=exc2[j-pp]; |
| 402 else if (j-pp-pitch<0) |
| 403 e[j]=exc2[j-pp-pitch]; |
| 404 else |
| 405 e[j]=0; |
| 406 } |
| 407 #ifdef FIXED_POINT |
| 408 /* Scale target and excitation down if needed (avoiding overflow) */ |
| 409 if (scaledown) |
| 410 { |
| 411 for (j=0;j<nsf;j++) |
| 412 e[j] = SHR16(e[j],1); |
| 413 for (j=0;j<nsf;j++) |
| 414 new_target[j] = SHR16(new_target[j],1); |
| 415 } |
| 416 #endif |
| 417 for (j=0;j<p;j++) |
| 418 mm[j] = 0; |
| 419 iir_mem16(e, ak, e, nsf, p, mm, stack); |
| 420 for (j=0;j<p;j++) |
| 421 mm[j] = 0; |
| 422 filter_mem16(e, awk1, awk2, e, nsf, p, mm, stack); |
| 423 for (j=0;j<nsf;j++) |
| 424 x[2][j] = e[j]; |
| 425 } |
| 426 for (i=1;i>=0;i--) |
| 427 { |
| 428 spx_word16_t e0=exc2[-pitch-1+i]; |
| 429 #ifdef FIXED_POINT |
| 430 /* Scale excitation down if needed (avoiding overflow) */ |
| 431 if (scaledown) |
| 432 e0 = SHR16(e0,1); |
| 433 #endif |
| 434 x[i][0]=MULT16_16_Q14(r[0], e0); |
| 435 for (j=0;j<nsf-1;j++) |
| 436 x[i][j+1]=ADD32(x[i+1][j],MULT16_16_P14(r[j+1], e0)); |
| 437 } |
| 438 |
| 439 for (i=0;i<3;i++) |
| 440 corr[i]=inner_prod(x[i],new_target,nsf); |
| 441 for (i=0;i<3;i++) |
| 442 for (j=0;j<=i;j++) |
| 443 A[i][j]=A[j][i]=inner_prod(x[i],x[j],nsf); |
| 444 |
| 445 { |
| 446 spx_word32_t C[9]; |
| 447 #ifdef FIXED_POINT |
| 448 spx_word16_t C16[9]; |
| 449 #else |
| 450 spx_word16_t *C16=C; |
| 451 #endif |
| 452 C[0]=corr[2]; |
| 453 C[1]=corr[1]; |
| 454 C[2]=corr[0]; |
| 455 C[3]=A[1][2]; |
| 456 C[4]=A[0][1]; |
| 457 C[5]=A[0][2]; |
| 458 C[6]=A[2][2]; |
| 459 C[7]=A[1][1]; |
| 460 C[8]=A[0][0]; |
| 461 |
| 462 /*plc_tuning *= 2;*/ |
| 463 if (plc_tuning<2) |
| 464 plc_tuning=2; |
| 465 if (plc_tuning>30) |
| 466 plc_tuning=30; |
| 467 #ifdef FIXED_POINT |
| 468 C[0] = SHL32(C[0],1); |
| 469 C[1] = SHL32(C[1],1); |
| 470 C[2] = SHL32(C[2],1); |
| 471 C[3] = SHL32(C[3],1); |
| 472 C[4] = SHL32(C[4],1); |
| 473 C[5] = SHL32(C[5],1); |
| 474 C[6] = MAC16_32_Q15(C[6],MULT16_16_16(plc_tuning,655),C[6]); |
| 475 C[7] = MAC16_32_Q15(C[7],MULT16_16_16(plc_tuning,655),C[7]); |
| 476 C[8] = MAC16_32_Q15(C[8],MULT16_16_16(plc_tuning,655),C[8]); |
| 477 normalize16(C, C16, 32767, 9); |
| 478 #else |
| 479 C[6]*=.5*(1+.02*plc_tuning); |
| 480 C[7]*=.5*(1+.02*plc_tuning); |
| 481 C[8]*=.5*(1+.02*plc_tuning); |
| 482 #endif |
| 483 |
| 484 best_cdbk = pitch_gain_search_3tap_vq(gain_cdbk, gain_cdbk_size, C16, max_
gain); |
| 485 |
| 486 #ifdef FIXED_POINT |
| 487 gain[0] = ADD16(32,(spx_word16_t)gain_cdbk[best_cdbk*4]); |
| 488 gain[1] = ADD16(32,(spx_word16_t)gain_cdbk[best_cdbk*4+1]); |
| 489 gain[2] = ADD16(32,(spx_word16_t)gain_cdbk[best_cdbk*4+2]); |
| 490 /*printf ("%d %d %d %d\n",gain[0],gain[1],gain[2], best_cdbk);*/ |
| 491 #else |
| 492 gain[0] = 0.015625*gain_cdbk[best_cdbk*4] + .5; |
| 493 gain[1] = 0.015625*gain_cdbk[best_cdbk*4+1]+ .5; |
| 494 gain[2] = 0.015625*gain_cdbk[best_cdbk*4+2]+ .5; |
| 495 #endif |
| 496 *cdbk_index=best_cdbk; |
| 497 } |
| 498 |
| 499 SPEEX_MEMSET(exc, 0, nsf); |
| 500 for (i=0;i<3;i++) |
| 501 { |
| 502 int j; |
| 503 int tmp1, tmp3; |
| 504 int pp=pitch+1-i; |
| 505 tmp1=nsf; |
| 506 if (tmp1>pp) |
| 507 tmp1=pp; |
| 508 for (j=0;j<tmp1;j++) |
| 509 exc[j]=MAC16_16(exc[j],SHL16(gain[2-i],7),exc2[j-pp]); |
| 510 tmp3=nsf; |
| 511 if (tmp3>pp+pitch) |
| 512 tmp3=pp+pitch; |
| 513 for (j=tmp1;j<tmp3;j++) |
| 514 exc[j]=MAC16_16(exc[j],SHL16(gain[2-i],7),exc2[j-pp-pitch]); |
| 515 } |
| 516 for (i=0;i<nsf;i++) |
| 517 { |
| 518 spx_word32_t tmp = ADD32(ADD32(MULT16_16(gain[0],x[2][i]),MULT16_16(gain[1
],x[1][i])), |
| 519 MULT16_16(gain[2],x[0][i])); |
| 520 new_target[i] = SUB16(new_target[i], EXTRACT16(PSHR32(tmp,6))); |
| 521 } |
| 522 err = inner_prod(new_target, new_target, nsf); |
| 523 |
| 524 return err; |
| 525 } |
| 526 |
| 527 /** Finds the best quantized 3-tap pitch predictor by analysis by synthesis */ |
| 528 int pitch_search_3tap( |
| 529 spx_word16_t target[], /* Target vector */ |
| 530 spx_word16_t *sw, |
| 531 spx_coef_t ak[], /* LPCs for this subframe */ |
| 532 spx_coef_t awk1[], /* Weighted LPCs #1 for this subframe */ |
| 533 spx_coef_t awk2[], /* Weighted LPCs #2 for this subframe */ |
| 534 spx_sig_t exc[], /* Excitation */ |
| 535 const void *par, |
| 536 int start, /* Smallest pitch value allowed */ |
| 537 int end, /* Largest pitch value allowed */ |
| 538 spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */ |
| 539 int p, /* Number of LPC coeffs */ |
| 540 int nsf, /* Number of samples in subframe */ |
| 541 SpeexBits *bits, |
| 542 char *stack, |
| 543 spx_word16_t *exc2, |
| 544 spx_word16_t *r, |
| 545 int complexity, |
| 546 int cdbk_offset, |
| 547 int plc_tuning, |
| 548 spx_word32_t *cumul_gain |
| 549 ) |
| 550 { |
| 551 int i; |
| 552 int cdbk_index, pitch=0, best_gain_index=0; |
| 553 VARDECL(spx_sig_t *best_exc); |
| 554 VARDECL(spx_word16_t *new_target); |
| 555 VARDECL(spx_word16_t *best_target); |
| 556 int best_pitch=0; |
| 557 spx_word32_t err, best_err=-1; |
| 558 int N; |
| 559 const ltp_params *params; |
| 560 const signed char *gain_cdbk; |
| 561 int gain_cdbk_size; |
| 562 int scaledown=0; |
| 563 |
| 564 VARDECL(int *nbest); |
| 565 |
| 566 params = (const ltp_params*) par; |
| 567 gain_cdbk_size = 1<<params->gain_bits; |
| 568 gain_cdbk = params->gain_cdbk + 4*gain_cdbk_size*cdbk_offset; |
| 569 |
| 570 N=complexity; |
| 571 if (N>10) |
| 572 N=10; |
| 573 if (N<1) |
| 574 N=1; |
| 575 |
| 576 ALLOC(nbest, N, int); |
| 577 params = (const ltp_params*) par; |
| 578 |
| 579 if (end<start) |
| 580 { |
| 581 speex_bits_pack(bits, 0, params->pitch_bits); |
| 582 speex_bits_pack(bits, 0, params->gain_bits); |
| 583 SPEEX_MEMSET(exc, 0, nsf); |
| 584 return start; |
| 585 } |
| 586 |
| 587 #ifdef FIXED_POINT |
| 588 /* Check if we need to scale everything down in the pitch search to avoid ove
rflows */ |
| 589 for (i=0;i<nsf;i++) |
| 590 { |
| 591 if (ABS16(target[i])>16383) |
| 592 { |
| 593 scaledown=1; |
| 594 break; |
| 595 } |
| 596 } |
| 597 for (i=-end;i<nsf;i++) |
| 598 { |
| 599 if (ABS16(exc2[i])>16383) |
| 600 { |
| 601 scaledown=1; |
| 602 break; |
| 603 } |
| 604 } |
| 605 #endif |
| 606 if (N>end-start+1) |
| 607 N=end-start+1; |
| 608 if (end != start) |
| 609 open_loop_nbest_pitch(sw, start, end, nsf, nbest, NULL, N, stack); |
| 610 else |
| 611 nbest[0] = start; |
| 612 |
| 613 ALLOC(best_exc, nsf, spx_sig_t); |
| 614 ALLOC(new_target, nsf, spx_word16_t); |
| 615 ALLOC(best_target, nsf, spx_word16_t); |
| 616 |
| 617 for (i=0;i<N;i++) |
| 618 { |
| 619 pitch=nbest[i]; |
| 620 SPEEX_MEMSET(exc, 0, nsf); |
| 621 err=pitch_gain_search_3tap(target, ak, awk1, awk2, exc, gain_cdbk, gain_cd
bk_size, pitch, p, nsf, |
| 622 bits, stack, exc2, r, new_target, &cdbk_index,
plc_tuning, *cumul_gain, scaledown); |
| 623 if (err<best_err || best_err<0) |
| 624 { |
| 625 SPEEX_COPY(best_exc, exc, nsf); |
| 626 SPEEX_COPY(best_target, new_target, nsf); |
| 627 best_err=err; |
| 628 best_pitch=pitch; |
| 629 best_gain_index=cdbk_index; |
| 630 } |
| 631 } |
| 632 /*printf ("pitch: %d %d\n", best_pitch, best_gain_index);*/ |
| 633 speex_bits_pack(bits, best_pitch-start, params->pitch_bits); |
| 634 speex_bits_pack(bits, best_gain_index, params->gain_bits); |
| 635 #ifdef FIXED_POINT |
| 636 *cumul_gain = MULT16_32_Q13(SHL16(params->gain_cdbk[4*best_gain_index+3],8),
MAX32(1024,*cumul_gain)); |
| 637 #else |
| 638 *cumul_gain = 0.03125*MAX32(1024,*cumul_gain)*params->gain_cdbk[4*best_gain_i
ndex+3]; |
| 639 #endif |
| 640 /*printf ("%f\n", cumul_gain);*/ |
| 641 /*printf ("encode pitch: %d %d\n", best_pitch, best_gain_index);*/ |
| 642 SPEEX_COPY(exc, best_exc, nsf); |
| 643 SPEEX_COPY(target, best_target, nsf); |
| 644 #ifdef FIXED_POINT |
| 645 /* Scale target back up if needed */ |
| 646 if (scaledown) |
| 647 { |
| 648 for (i=0;i<nsf;i++) |
| 649 target[i]=SHL16(target[i],1); |
| 650 } |
| 651 #endif |
| 652 return pitch; |
| 653 } |
| 654 |
| 655 void pitch_unquant_3tap( |
| 656 spx_word16_t exc[], /* Input excitation */ |
| 657 spx_word32_t exc_out[], /* Output excitation */ |
| 658 int start, /* Smallest pitch value allowed */ |
| 659 int end, /* Largest pitch value allowed */ |
| 660 spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */ |
| 661 const void *par, |
| 662 int nsf, /* Number of samples in subframe */ |
| 663 int *pitch_val, |
| 664 spx_word16_t *gain_val, |
| 665 SpeexBits *bits, |
| 666 char *stack, |
| 667 int count_lost, |
| 668 int subframe_offset, |
| 669 spx_word16_t last_pitch_gain, |
| 670 int cdbk_offset |
| 671 ) |
| 672 { |
| 673 int i; |
| 674 int pitch; |
| 675 int gain_index; |
| 676 spx_word16_t gain[3]; |
| 677 const signed char *gain_cdbk; |
| 678 int gain_cdbk_size; |
| 679 const ltp_params *params; |
| 680 |
| 681 params = (const ltp_params*) par; |
| 682 gain_cdbk_size = 1<<params->gain_bits; |
| 683 gain_cdbk = params->gain_cdbk + 4*gain_cdbk_size*cdbk_offset; |
| 684 |
| 685 pitch = speex_bits_unpack_unsigned(bits, params->pitch_bits); |
| 686 pitch += start; |
| 687 gain_index = speex_bits_unpack_unsigned(bits, params->gain_bits); |
| 688 /*printf ("decode pitch: %d %d\n", pitch, gain_index);*/ |
| 689 #ifdef FIXED_POINT |
| 690 gain[0] = ADD16(32,(spx_word16_t)gain_cdbk[gain_index*4]); |
| 691 gain[1] = ADD16(32,(spx_word16_t)gain_cdbk[gain_index*4+1]); |
| 692 gain[2] = ADD16(32,(spx_word16_t)gain_cdbk[gain_index*4+2]); |
| 693 #else |
| 694 gain[0] = 0.015625*gain_cdbk[gain_index*4]+.5; |
| 695 gain[1] = 0.015625*gain_cdbk[gain_index*4+1]+.5; |
| 696 gain[2] = 0.015625*gain_cdbk[gain_index*4+2]+.5; |
| 697 #endif |
| 698 |
| 699 if (count_lost && pitch > subframe_offset) |
| 700 { |
| 701 spx_word16_t gain_sum; |
| 702 if (1) { |
| 703 #ifdef FIXED_POINT |
| 704 spx_word16_t tmp = count_lost < 4 ? last_pitch_gain : SHR16(last_pitch_
gain,1); |
| 705 if (tmp>62) |
| 706 tmp=62; |
| 707 #else |
| 708 spx_word16_t tmp = count_lost < 4 ? last_pitch_gain : 0.5 * last_pitch_
gain; |
| 709 if (tmp>.95) |
| 710 tmp=.95; |
| 711 #endif |
| 712 gain_sum = gain_3tap_to_1tap(gain); |
| 713 |
| 714 if (gain_sum > tmp) |
| 715 { |
| 716 spx_word16_t fact = DIV32_16(SHL32(EXTEND32(tmp),14),gain_sum); |
| 717 for (i=0;i<3;i++) |
| 718 gain[i]=MULT16_16_Q14(fact,gain[i]); |
| 719 } |
| 720 |
| 721 } |
| 722 |
| 723 } |
| 724 |
| 725 *pitch_val = pitch; |
| 726 gain_val[0]=gain[0]; |
| 727 gain_val[1]=gain[1]; |
| 728 gain_val[2]=gain[2]; |
| 729 gain[0] = SHL16(gain[0],7); |
| 730 gain[1] = SHL16(gain[1],7); |
| 731 gain[2] = SHL16(gain[2],7); |
| 732 SPEEX_MEMSET(exc_out, 0, nsf); |
| 733 for (i=0;i<3;i++) |
| 734 { |
| 735 int j; |
| 736 int tmp1, tmp3; |
| 737 int pp=pitch+1-i; |
| 738 tmp1=nsf; |
| 739 if (tmp1>pp) |
| 740 tmp1=pp; |
| 741 for (j=0;j<tmp1;j++) |
| 742 exc_out[j]=MAC16_16(exc_out[j],gain[2-i],exc[j-pp]); |
| 743 tmp3=nsf; |
| 744 if (tmp3>pp+pitch) |
| 745 tmp3=pp+pitch; |
| 746 for (j=tmp1;j<tmp3;j++) |
| 747 exc_out[j]=MAC16_16(exc_out[j],gain[2-i],exc[j-pp-pitch]); |
| 748 } |
| 749 /*for (i=0;i<nsf;i++) |
| 750 exc[i]=PSHR32(exc32[i],13);*/ |
| 751 } |
| 752 |
| 753 |
| 754 /** Forced pitch delay and gain */ |
| 755 int forced_pitch_quant( |
| 756 spx_word16_t target[], /* Target vector */ |
| 757 spx_word16_t *sw, |
| 758 spx_coef_t ak[], /* LPCs for this subframe */ |
| 759 spx_coef_t awk1[], /* Weighted LPCs #1 for this subframe */ |
| 760 spx_coef_t awk2[], /* Weighted LPCs #2 for this subframe */ |
| 761 spx_sig_t exc[], /* Excitation */ |
| 762 const void *par, |
| 763 int start, /* Smallest pitch value allowed */ |
| 764 int end, /* Largest pitch value allowed */ |
| 765 spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */ |
| 766 int p, /* Number of LPC coeffs */ |
| 767 int nsf, /* Number of samples in subframe */ |
| 768 SpeexBits *bits, |
| 769 char *stack, |
| 770 spx_word16_t *exc2, |
| 771 spx_word16_t *r, |
| 772 int complexity, |
| 773 int cdbk_offset, |
| 774 int plc_tuning, |
| 775 spx_word32_t *cumul_gain |
| 776 ) |
| 777 { |
| 778 int i; |
| 779 VARDECL(spx_word16_t *res); |
| 780 ALLOC(res, nsf, spx_word16_t); |
| 781 #ifdef FIXED_POINT |
| 782 if (pitch_coef>63) |
| 783 pitch_coef=63; |
| 784 #else |
| 785 if (pitch_coef>.99) |
| 786 pitch_coef=.99; |
| 787 #endif |
| 788 for (i=0;i<nsf&&i<start;i++) |
| 789 { |
| 790 exc[i]=MULT16_16(SHL16(pitch_coef, 7),exc2[i-start]); |
| 791 } |
| 792 for (;i<nsf;i++) |
| 793 { |
| 794 exc[i]=MULT16_32_Q15(SHL16(pitch_coef, 9),exc[i-start]); |
| 795 } |
| 796 for (i=0;i<nsf;i++) |
| 797 res[i] = EXTRACT16(PSHR32(exc[i], SIG_SHIFT-1)); |
| 798 syn_percep_zero16(res, ak, awk1, awk2, res, nsf, p, stack); |
| 799 for (i=0;i<nsf;i++) |
| 800 target[i]=EXTRACT16(SATURATE(SUB32(EXTEND32(target[i]),EXTEND32(res[i])),3
2700)); |
| 801 return start; |
| 802 } |
| 803 |
| 804 /** Unquantize forced pitch delay and gain */ |
| 805 void forced_pitch_unquant( |
| 806 spx_word16_t exc[], /* Input excitation */ |
| 807 spx_word32_t exc_out[], /* Output excitation */ |
| 808 int start, /* Smallest pitch value allowed */ |
| 809 int end, /* Largest pitch value allowed */ |
| 810 spx_word16_t pitch_coef, /* Voicing (pitch) coefficient */ |
| 811 const void *par, |
| 812 int nsf, /* Number of samples in subframe */ |
| 813 int *pitch_val, |
| 814 spx_word16_t *gain_val, |
| 815 SpeexBits *bits, |
| 816 char *stack, |
| 817 int count_lost, |
| 818 int subframe_offset, |
| 819 spx_word16_t last_pitch_gain, |
| 820 int cdbk_offset |
| 821 ) |
| 822 { |
| 823 int i; |
| 824 #ifdef FIXED_POINT |
| 825 if (pitch_coef>63) |
| 826 pitch_coef=63; |
| 827 #else |
| 828 if (pitch_coef>.99) |
| 829 pitch_coef=.99; |
| 830 #endif |
| 831 for (i=0;i<nsf;i++) |
| 832 { |
| 833 exc_out[i]=MULT16_16(exc[i-start],SHL16(pitch_coef,7)); |
| 834 exc[i] = EXTRACT16(PSHR32(exc_out[i],13)); |
| 835 } |
| 836 *pitch_val = start; |
| 837 gain_val[0]=gain_val[2]=0; |
| 838 gain_val[1] = pitch_coef; |
| 839 } |
OLD | NEW |