1 /* Copyright (c) 2007-2008 CSIRO 2 Copyright (c) 2007-2009 Xiph.Org Foundation 3 Written by Jean-Marc Valin */ 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 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 20 OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 21 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 22 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 23 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 24 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 25 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 26 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #ifdef HAVE_CONFIG_H 30 #include "config.h" 31 #endif 32 33 #include <math.h> 34 #include "modes.h" 35 #include "cwrs.h" 36 #include "arch.h" 37 #include "os_support.h" 38 39 #include "entcode.h" 40 #include "rate.h" 41 42 static const unsigned char LOG2_FRAC_TABLE[24]={ 43 0, 44 8,13, 45 16,19,21,23, 46 24,26,27,28,29,30,31,32, 47 32,33,34,34,35,36,36,37,37 48 }; 49 50 #ifdef CUSTOM_MODES 51 52 /*Determines if V(N,K) fits in a 32-bit unsigned integer. 53 N and K are themselves limited to 15 bits.*/ 54 static int fits_in32(int _n, int _k) 55 { 56 static const opus_int16 maxN[15] = { 57 32767, 32767, 32767, 1476, 283, 109, 60, 40, 58 29, 24, 20, 18, 16, 14, 13}; 59 static const opus_int16 maxK[15] = { 60 32767, 32767, 32767, 32767, 1172, 238, 95, 53, 61 36, 27, 22, 18, 16, 15, 13}; 62 if (_n>=14) 63 { 64 if (_k>=14) 65 return 0; 66 else 67 return _n <= maxN[_k]; 68 } else { 69 return _k <= maxK[_n]; 70 } 71 } 72 73 void compute_pulse_cache(CELTMode *m, int LM) 74 { 75 int C; 76 int i; 77 int j; 78 int curr=0; 79 int nbEntries=0; 80 int entryN[100], entryK[100], entryI[100]; 81 const opus_int16 *eBands = m->eBands; 82 PulseCache *cache = &m->cache; 83 opus_int16 *cindex; 84 unsigned char *bits; 85 unsigned char *cap; 86 87 cindex = (opus_int16 *)opus_alloc(sizeof(cache->index[0])*m->nbEBands*(LM+2)); 88 cache->index = cindex; 89 90 /* Scan for all unique band sizes */ 91 for (i=0;i<=LM+1;i++) 92 { 93 for (j=0;j<m->nbEBands;j++) 94 { 95 int k; 96 int N = (eBands[j+1]-eBands[j])<<i>>1; 97 cindex[i*m->nbEBands+j] = -1; 98 /* Find other bands that have the same size */ 99 for (k=0;k<=i;k++) 100 { 101 int n; 102 for (n=0;n<m->nbEBands && (k!=i || n<j);n++) 103 { 104 if (N == (eBands[n+1]-eBands[n])<<k>>1) 105 { 106 cindex[i*m->nbEBands+j] = cindex[k*m->nbEBands+n]; 107 break; 108 } 109 } 110 } 111 if (cache->index[i*m->nbEBands+j] == -1 && N!=0) 112 { 113 int K; 114 entryN[nbEntries] = N; 115 K = 0; 116 while (fits_in32(N,get_pulses(K+1)) && K<MAX_PSEUDO) 117 K++; 118 entryK[nbEntries] = K; 119 cindex[i*m->nbEBands+j] = curr; 120 entryI[nbEntries] = curr; 121 122 curr += K+1; 123 nbEntries++; 124 } 125 } 126 } 127 bits = (unsigned char *)opus_alloc(sizeof(unsigned char)*curr); 128 cache->bits = bits; 129 cache->size = curr; 130 /* Compute the cache for all unique sizes */ 131 for (i=0;i<nbEntries;i++) 132 { 133 unsigned char *ptr = bits+entryI[i]; 134 opus_int16 tmp[CELT_MAX_PULSES+1]; 135 get_required_bits(tmp, entryN[i], get_pulses(entryK[i]), BITRES); 136 for (j=1;j<=entryK[i];j++) 137 ptr[j] = tmp[get_pulses(j)]-1; 138 ptr[0] = entryK[i]; 139 } 140 141 /* Compute the maximum rate for each band at which we'll reliably use as 142 many bits as we ask for. */ 143 cache->caps = cap = (unsigned char *)opus_alloc(sizeof(cache->caps[0])*(LM+1)*2*m->nbEBands); 144 for (i=0;i<=LM;i++) 145 { 146 for (C=1;C<=2;C++) 147 { 148 for (j=0;j<m->nbEBands;j++) 149 { 150 int N0; 151 int max_bits; 152 N0 = m->eBands[j+1]-m->eBands[j]; 153 /* N=1 bands only have a sign bit and fine bits. */ 154 if (N0<<i == 1) 155 max_bits = C*(1+MAX_FINE_BITS)<<BITRES; 156 else 157 { 158 const unsigned char *pcache; 159 opus_int32 num; 160 opus_int32 den; 161 int LM0; 162 int N; 163 int offset; 164 int ndof; 165 int qb; 166 int k; 167 LM0 = 0; 168 /* Even-sized bands bigger than N=2 can be split one more time. 169 As of commit 44203907 all bands >1 are even, including custom modes.*/ 170 if (N0 > 2) 171 { 172 N0>>=1; 173 LM0--; 174 } 175 /* N0=1 bands can't be split down to N<2. */ 176 else if (N0 <= 1) 177 { 178 LM0=IMIN(i,1); 179 N0<<=LM0; 180 } 181 /* Compute the cost for the lowest-level PVQ of a fully split 182 band. */ 183 pcache = bits + cindex[(LM0+1)*m->nbEBands+j]; 184 max_bits = pcache[pcache[0]]+1; 185 /* Add in the cost of coding regular splits. */ 186 N = N0; 187 for(k=0;k<i-LM0;k++){ 188 max_bits <<= 1; 189 /* Offset the number of qtheta bits by log2(N)/2 190 + QTHETA_OFFSET compared to their "fair share" of 191 total/N */ 192 offset = ((m->logN[j]+((LM0+k)<<BITRES))>>1)-QTHETA_OFFSET; 193 /* The number of qtheta bits we'll allocate if the remainder 194 is to be max_bits. 195 The average measured cost for theta is 0.89701 times qb, 196 approximated here as 459/512. */ 197 num=459*(opus_int32)((2*N-1)*offset+max_bits); 198 den=((opus_int32)(2*N-1)<<9)-459; 199 qb = IMIN((num+(den>>1))/den, 57); 200 celt_assert(qb >= 0); 201 max_bits += qb; 202 N <<= 1; 203 } 204 /* Add in the cost of a stereo split, if necessary. */ 205 if (C==2) 206 { 207 max_bits <<= 1; 208 offset = ((m->logN[j]+(i<<BITRES))>>1)-(N==2?QTHETA_OFFSET_TWOPHASE:QTHETA_OFFSET); 209 ndof = 2*N-1-(N==2); 210 /* The average measured cost for theta with the step PDF is 211 0.95164 times qb, approximated here as 487/512. */ 212 num = (N==2?512:487)*(opus_int32)(max_bits+ndof*offset); 213 den = ((opus_int32)ndof<<9)-(N==2?512:487); 214 qb = IMIN((num+(den>>1))/den, (N==2?64:61)); 215 celt_assert(qb >= 0); 216 max_bits += qb; 217 } 218 /* Add the fine bits we'll use. */ 219 /* Compensate for the extra DoF in stereo */ 220 ndof = C*N + ((C==2 && N>2) ? 1 : 0); 221 /* Offset the number of fine bits by log2(N)/2 + FINE_OFFSET 222 compared to their "fair share" of total/N */ 223 offset = ((m->logN[j] + (i<<BITRES))>>1)-FINE_OFFSET; 224 /* N=2 is the only point that doesn't match the curve */ 225 if (N==2) 226 offset += 1<<BITRES>>2; 227 /* The number of fine bits we'll allocate if the remainder is 228 to be max_bits. */ 229 num = max_bits+ndof*offset; 230 den = (ndof-1)<<BITRES; 231 qb = IMIN((num+(den>>1))/den, MAX_FINE_BITS); 232 celt_assert(qb >= 0); 233 max_bits += C*qb<<BITRES; 234 } 235 max_bits = (4*max_bits/(C*((m->eBands[j+1]-m->eBands[j])<<i)))-64; 236 celt_assert(max_bits >= 0); 237 celt_assert(max_bits < 256); 238 *cap++ = (unsigned char)max_bits; 239 } 240 } 241 } 242 } 243 244 #endif /* CUSTOM_MODES */ 245 246 #define ALLOC_STEPS 6 247 248 static OPUS_INLINE int interp_bits2pulses(const CELTMode *m, int start, int end, int skip_start, 249 const int *bits1, const int *bits2, const int *thresh, const int *cap, opus_int32 total, opus_int32 *_balance, 250 int skip_rsv, int *intensity, int intensity_rsv, int *dual_stereo, int dual_stereo_rsv, int *bits, 251 int *ebits, int *fine_priority, int C, int LM, ec_ctx *ec, int encode, int prev, int signalBandwidth) 252 { 253 opus_int32 psum; 254 int lo, hi; 255 int i, j; 256 int logM; 257 int stereo; 258 int codedBands=-1; 259 int alloc_floor; 260 opus_int32 left, percoeff; 261 int done; 262 opus_int32 balance; 263 SAVE_STACK; 264 265 alloc_floor = C<<BITRES; 266 stereo = C>1; 267 268 logM = LM<<BITRES; 269 lo = 0; 270 hi = 1<<ALLOC_STEPS; 271 for (i=0;i<ALLOC_STEPS;i++) 272 { 273 int mid = (lo+hi)>>1; 274 psum = 0; 275 done = 0; 276 for (j=end;j-->start;) 277 { 278 int tmp = bits1[j] + (mid*(opus_int32)bits2[j]>>ALLOC_STEPS); 279 if (tmp >= thresh[j] || done) 280 { 281 done = 1; 282 /* Don't allocate more than we can actually use */ 283 psum += IMIN(tmp, cap[j]); 284 } else { 285 if (tmp >= alloc_floor) 286 psum += alloc_floor; 287 } 288 } 289 if (psum > total) 290 hi = mid; 291 else 292 lo = mid; 293 } 294 psum = 0; 295 /*printf ("interp bisection gave %d\n", lo);*/ 296 done = 0; 297 for (j=end;j-->start;) 298 { 299 int tmp = bits1[j] + ((opus_int32)lo*bits2[j]>>ALLOC_STEPS); 300 if (tmp < thresh[j] && !done) 301 { 302 if (tmp >= alloc_floor) 303 tmp = alloc_floor; 304 else 305 tmp = 0; 306 } else 307 done = 1; 308 /* Don't allocate more than we can actually use */ 309 tmp = IMIN(tmp, cap[j]); 310 bits[j] = tmp; 311 psum += tmp; 312 } 313 314 /* Decide which bands to skip, working backwards from the end. */ 315 for (codedBands=end;;codedBands--) 316 { 317 int band_width; 318 int band_bits; 319 int rem; 320 j = codedBands-1; 321 /* Never skip the first band, nor a band that has been boosted by 322 dynalloc. 323 In the first case, we'd be coding a bit to signal we're going to waste 324 all the other bits. 325 In the second case, we'd be coding a bit to redistribute all the bits 326 we just signaled should be cocentrated in this band. */ 327 if (j<=skip_start) 328 { 329 /* Give the bit we reserved to end skipping back. */ 330 total += skip_rsv; 331 break; 332 } 333 /*Figure out how many left-over bits we would be adding to this band. 334 This can include bits we've stolen back from higher, skipped bands.*/ 335 left = total-psum; 336 percoeff = celt_udiv(left, m->eBands[codedBands]-m->eBands[start]); 337 left -= (m->eBands[codedBands]-m->eBands[start])*percoeff; 338 rem = IMAX(left-(m->eBands[j]-m->eBands[start]),0); 339 band_width = m->eBands[codedBands]-m->eBands[j]; 340 band_bits = (int)(bits[j] + percoeff*band_width + rem); 341 /*Only code a skip decision if we're above the threshold for this band. 342 Otherwise it is force-skipped. 343 This ensures that we have enough bits to code the skip flag.*/ 344 if (band_bits >= IMAX(thresh[j], alloc_floor+(1<<BITRES))) 345 { 346 if (encode) 347 { 348 /*This if() block is the only part of the allocation function that 349 is not a mandatory part of the bitstream: any bands we choose to 350 skip here must be explicitly signaled.*/ 351 int depth_threshold; 352 /*We choose a threshold with some hysteresis to keep bands from 353 fluctuating in and out, but we try not to fold below a certain point. */ 354 if (codedBands > 17) 355 depth_threshold = j<prev ? 7 : 9; 356 else 357 depth_threshold = 0; 358 #ifdef FUZZING 359 if ((rand()&0x1) == 0) 360 #else 361 if (codedBands<=start+2 || (band_bits > (depth_threshold*band_width<<LM<<BITRES)>>4 && j<=signalBandwidth)) 362 #endif 363 { 364 ec_enc_bit_logp(ec, 1, 1); 365 break; 366 } 367 ec_enc_bit_logp(ec, 0, 1); 368 } else if (ec_dec_bit_logp(ec, 1)) { 369 break; 370 } 371 /*We used a bit to skip this band.*/ 372 psum += 1<<BITRES; 373 band_bits -= 1<<BITRES; 374 } 375 /*Reclaim the bits originally allocated to this band.*/ 376 psum -= bits[j]+intensity_rsv; 377 if (intensity_rsv > 0) 378 intensity_rsv = LOG2_FRAC_TABLE[j-start]; 379 psum += intensity_rsv; 380 if (band_bits >= alloc_floor) 381 { 382 /*If we have enough for a fine energy bit per channel, use it.*/ 383 psum += alloc_floor; 384 bits[j] = alloc_floor; 385 } else { 386 /*Otherwise this band gets nothing at all.*/ 387 bits[j] = 0; 388 } 389 } 390 391 celt_assert(codedBands > start); 392 /* Code the intensity and dual stereo parameters. */ 393 if (intensity_rsv > 0) 394 { 395 if (encode) 396 { 397 *intensity = IMIN(*intensity, codedBands); 398 ec_enc_uint(ec, *intensity-start, codedBands+1-start); 399 } 400 else 401 *intensity = start+ec_dec_uint(ec, codedBands+1-start); 402 } 403 else 404 *intensity = 0; 405 if (*intensity <= start) 406 { 407 total += dual_stereo_rsv; 408 dual_stereo_rsv = 0; 409 } 410 if (dual_stereo_rsv > 0) 411 { 412 if (encode) 413 ec_enc_bit_logp(ec, *dual_stereo, 1); 414 else 415 *dual_stereo = ec_dec_bit_logp(ec, 1); 416 } 417 else 418 *dual_stereo = 0; 419 420 /* Allocate the remaining bits */ 421 left = total-psum; 422 percoeff = celt_udiv(left, m->eBands[codedBands]-m->eBands[start]); 423 left -= (m->eBands[codedBands]-m->eBands[start])*percoeff; 424 for (j=start;j<codedBands;j++) 425 bits[j] += ((int)percoeff*(m->eBands[j+1]-m->eBands[j])); 426 for (j=start;j<codedBands;j++) 427 { 428 int tmp = (int)IMIN(left, m->eBands[j+1]-m->eBands[j]); 429 bits[j] += tmp; 430 left -= tmp; 431 } 432 /*for (j=0;j<end;j++)printf("%d ", bits[j]);printf("\n");*/ 433 434 balance = 0; 435 for (j=start;j<codedBands;j++) 436 { 437 int N0, N, den; 438 int offset; 439 int NClogN; 440 opus_int32 excess, bit; 441 442 celt_assert(bits[j] >= 0); 443 N0 = m->eBands[j+1]-m->eBands[j]; 444 N=N0<<LM; 445 bit = (opus_int32)bits[j]+balance; 446 447 if (N>1) 448 { 449 excess = MAX32(bit-cap[j],0); 450 bits[j] = bit-excess; 451 452 /* Compensate for the extra DoF in stereo */ 453 den=(C*N+ ((C==2 && N>2 && !*dual_stereo && j<*intensity) ? 1 : 0)); 454 455 NClogN = den*(m->logN[j] + logM); 456 457 /* Offset for the number of fine bits by log2(N)/2 + FINE_OFFSET 458 compared to their "fair share" of total/N */ 459 offset = (NClogN>>1)-den*FINE_OFFSET; 460 461 /* N=2 is the only point that doesn't match the curve */ 462 if (N==2) 463 offset += den<<BITRES>>2; 464 465 /* Changing the offset for allocating the second and third 466 fine energy bit */ 467 if (bits[j] + offset < den*2<<BITRES) 468 offset += NClogN>>2; 469 else if (bits[j] + offset < den*3<<BITRES) 470 offset += NClogN>>3; 471 472 /* Divide with rounding */ 473 ebits[j] = IMAX(0, (bits[j] + offset + (den<<(BITRES-1)))); 474 ebits[j] = celt_udiv(ebits[j], den)>>BITRES; 475 476 /* Make sure not to bust */ 477 if (C*ebits[j] > (bits[j]>>BITRES)) 478 ebits[j] = bits[j] >> stereo >> BITRES; 479 480 /* More than that is useless because that's about as far as PVQ can go */ 481 ebits[j] = IMIN(ebits[j], MAX_FINE_BITS); 482 483 /* If we rounded down or capped this band, make it a candidate for the 484 final fine energy pass */ 485 fine_priority[j] = ebits[j]*(den<<BITRES) >= bits[j]+offset; 486 487 /* Remove the allocated fine bits; the rest are assigned to PVQ */ 488 bits[j] -= C*ebits[j]<<BITRES; 489 490 } else { 491 /* For N=1, all bits go to fine energy except for a single sign bit */ 492 excess = MAX32(0,bit-(C<<BITRES)); 493 bits[j] = bit-excess; 494 ebits[j] = 0; 495 fine_priority[j] = 1; 496 } 497 498 /* Fine energy can't take advantage of the re-balancing in 499 quant_all_bands(). 500 Instead, do the re-balancing here.*/ 501 if(excess > 0) 502 { 503 int extra_fine; 504 int extra_bits; 505 extra_fine = IMIN(excess>>(stereo+BITRES),MAX_FINE_BITS-ebits[j]); 506 ebits[j] += extra_fine; 507 extra_bits = extra_fine*C<<BITRES; 508 fine_priority[j] = extra_bits >= excess-balance; 509 excess -= extra_bits; 510 } 511 balance = excess; 512 513 celt_assert(bits[j] >= 0); 514 celt_assert(ebits[j] >= 0); 515 } 516 /* Save any remaining bits over the cap for the rebalancing in 517 quant_all_bands(). */ 518 *_balance = balance; 519 520 /* The skipped bands use all their bits for fine energy. */ 521 for (;j<end;j++) 522 { 523 ebits[j] = bits[j] >> stereo >> BITRES; 524 celt_assert(C*ebits[j]<<BITRES == bits[j]); 525 bits[j] = 0; 526 fine_priority[j] = ebits[j]<1; 527 } 528 RESTORE_STACK; 529 return codedBands; 530 } 531 532 int compute_allocation(const CELTMode *m, int start, int end, const int *offsets, const int *cap, int alloc_trim, int *intensity, int *dual_stereo, 533 opus_int32 total, opus_int32 *balance, int *pulses, int *ebits, int *fine_priority, int C, int LM, ec_ctx *ec, int encode, int prev, int signalBandwidth) 534 { 535 int lo, hi, len, j; 536 int codedBands; 537 int skip_start; 538 int skip_rsv; 539 int intensity_rsv; 540 int dual_stereo_rsv; 541 VARDECL(int, bits1); 542 VARDECL(int, bits2); 543 VARDECL(int, thresh); 544 VARDECL(int, trim_offset); 545 SAVE_STACK; 546 547 total = IMAX(total, 0); 548 len = m->nbEBands; 549 skip_start = start; 550 /* Reserve a bit to signal the end of manually skipped bands. */ 551 skip_rsv = total >= 1<<BITRES ? 1<<BITRES : 0; 552 total -= skip_rsv; 553 /* Reserve bits for the intensity and dual stereo parameters. */ 554 intensity_rsv = dual_stereo_rsv = 0; 555 if (C==2) 556 { 557 intensity_rsv = LOG2_FRAC_TABLE[end-start]; 558 if (intensity_rsv>total) 559 intensity_rsv = 0; 560 else 561 { 562 total -= intensity_rsv; 563 dual_stereo_rsv = total>=1<<BITRES ? 1<<BITRES : 0; 564 total -= dual_stereo_rsv; 565 } 566 } 567 ALLOC(bits1, len, int); 568 ALLOC(bits2, len, int); 569 ALLOC(thresh, len, int); 570 ALLOC(trim_offset, len, int); 571 572 for (j=start;j<end;j++) 573 { 574 /* Below this threshold, we're sure not to allocate any PVQ bits */ 575 thresh[j] = IMAX((C)<<BITRES, (3*(m->eBands[j+1]-m->eBands[j])<<LM<<BITRES)>>4); 576 /* Tilt of the allocation curve */ 577 trim_offset[j] = C*(m->eBands[j+1]-m->eBands[j])*(alloc_trim-5-LM)*(end-j-1) 578 *(1<<(LM+BITRES))>>6; 579 /* Giving less resolution to single-coefficient bands because they get 580 more benefit from having one coarse value per coefficient*/ 581 if ((m->eBands[j+1]-m->eBands[j])<<LM==1) 582 trim_offset[j] -= C<<BITRES; 583 } 584 lo = 1; 585 hi = m->nbAllocVectors - 1; 586 do 587 { 588 int done = 0; 589 int psum = 0; 590 int mid = (lo+hi) >> 1; 591 for (j=end;j-->start;) 592 { 593 int bitsj; 594 int N = m->eBands[j+1]-m->eBands[j]; 595 bitsj = C*N*m->allocVectors[mid*len+j]<<LM>>2; 596 if (bitsj > 0) 597 bitsj = IMAX(0, bitsj + trim_offset[j]); 598 bitsj += offsets[j]; 599 if (bitsj >= thresh[j] || done) 600 { 601 done = 1; 602 /* Don't allocate more than we can actually use */ 603 psum += IMIN(bitsj, cap[j]); 604 } else { 605 if (bitsj >= C<<BITRES) 606 psum += C<<BITRES; 607 } 608 } 609 if (psum > total) 610 hi = mid - 1; 611 else 612 lo = mid + 1; 613 /*printf ("lo = %d, hi = %d\n", lo, hi);*/ 614 } 615 while (lo <= hi); 616 hi = lo--; 617 /*printf ("interp between %d and %d\n", lo, hi);*/ 618 for (j=start;j<end;j++) 619 { 620 int bits1j, bits2j; 621 int N = m->eBands[j+1]-m->eBands[j]; 622 bits1j = C*N*m->allocVectors[lo*len+j]<<LM>>2; 623 bits2j = hi>=m->nbAllocVectors ? 624 cap[j] : C*N*m->allocVectors[hi*len+j]<<LM>>2; 625 if (bits1j > 0) 626 bits1j = IMAX(0, bits1j + trim_offset[j]); 627 if (bits2j > 0) 628 bits2j = IMAX(0, bits2j + trim_offset[j]); 629 if (lo > 0) 630 bits1j += offsets[j]; 631 bits2j += offsets[j]; 632 if (offsets[j]>0) 633 skip_start = j; 634 bits2j = IMAX(0,bits2j-bits1j); 635 bits1[j] = bits1j; 636 bits2[j] = bits2j; 637 } 638 codedBands = interp_bits2pulses(m, start, end, skip_start, bits1, bits2, thresh, cap, 639 total, balance, skip_rsv, intensity, intensity_rsv, dual_stereo, dual_stereo_rsv, 640 pulses, ebits, fine_priority, C, LM, ec, encode, prev, signalBandwidth); 641 RESTORE_STACK; 642 return codedBands; 643 } 644 645
