1 2 /* ----------------------------------------------------------------------------------------------------------- 3 Software License for The Fraunhofer FDK AAC Codec Library for Android 4 5 Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur Frderung der angewandten Forschung e.V. 6 All rights reserved. 7 8 1. INTRODUCTION 9 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements 10 the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio. 11 This FDK AAC Codec software is intended to be used on a wide variety of Android devices. 12 13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual 14 audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by 15 independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part 16 of the MPEG specifications. 17 18 Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer) 19 may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners 20 individually for the purpose of encoding or decoding bit streams in products that are compliant with 21 the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license 22 these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec 23 software may already be covered under those patent licenses when it is used for those licensed purposes only. 24 25 Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality, 26 are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional 27 applications information and documentation. 28 29 2. COPYRIGHT LICENSE 30 31 Redistribution and use in source and binary forms, with or without modification, are permitted without 32 payment of copyright license fees provided that you satisfy the following conditions: 33 34 You must retain the complete text of this software license in redistributions of the FDK AAC Codec or 35 your modifications thereto in source code form. 36 37 You must retain the complete text of this software license in the documentation and/or other materials 38 provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form. 39 You must make available free of charge copies of the complete source code of the FDK AAC Codec and your 40 modifications thereto to recipients of copies in binary form. 41 42 The name of Fraunhofer may not be used to endorse or promote products derived from this library without 43 prior written permission. 44 45 You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec 46 software or your modifications thereto. 47 48 Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software 49 and the date of any change. For modified versions of the FDK AAC Codec, the term 50 "Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term 51 "Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android." 52 53 3. NO PATENT LICENSE 54 55 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer, 56 ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with 57 respect to this software. 58 59 You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized 60 by appropriate patent licenses. 61 62 4. DISCLAIMER 63 64 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors 65 "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties 66 of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 67 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages, 68 including but not limited to procurement of substitute goods or services; loss of use, data, or profits, 69 or business interruption, however caused and on any theory of liability, whether in contract, strict 70 liability, or tort (including negligence), arising in any way out of the use of this software, even if 71 advised of the possibility of such damage. 72 73 5. CONTACT INFORMATION 74 75 Fraunhofer Institute for Integrated Circuits IIS 76 Attention: Audio and Multimedia Departments - FDK AAC LL 77 Am Wolfsmantel 33 78 91058 Erlangen, Germany 79 80 www.iis.fraunhofer.de/amm 81 amm-info (at) iis.fraunhofer.de 82 ----------------------------------------------------------------------------------------------------------- */ 83 84 #include "code_env.h" 85 #include "sbr_rom.h" 86 87 /***************************************************************************** 88 89 functionname: FDKsbrEnc_InitSbrHuffmanTables 90 description: initializes Huffman Tables dependent on chosen amp_res 91 returns: error handle 92 input: 93 output: 94 95 *****************************************************************************/ 96 INT 97 FDKsbrEnc_InitSbrHuffmanTables (HANDLE_SBR_ENV_DATA sbrEnvData, 98 HANDLE_SBR_CODE_ENVELOPE henv, 99 HANDLE_SBR_CODE_ENVELOPE hnoise, 100 AMP_RES amp_res) 101 { 102 if ( (!henv) || (!hnoise) || (!sbrEnvData) ) 103 return (1); /* not init. */ 104 105 sbrEnvData->init_sbr_amp_res = amp_res; 106 107 switch (amp_res) { 108 case SBR_AMP_RES_3_0: 109 /*envelope data*/ 110 111 /*Level/Pan - coding */ 112 sbrEnvData->hufftableLevelTimeC = v_Huff_envelopeLevelC11T; 113 sbrEnvData->hufftableLevelTimeL = v_Huff_envelopeLevelL11T; 114 sbrEnvData->hufftableBalanceTimeC = bookSbrEnvBalanceC11T; 115 sbrEnvData->hufftableBalanceTimeL = bookSbrEnvBalanceL11T; 116 117 sbrEnvData->hufftableLevelFreqC = v_Huff_envelopeLevelC11F; 118 sbrEnvData->hufftableLevelFreqL = v_Huff_envelopeLevelL11F; 119 sbrEnvData->hufftableBalanceFreqC = bookSbrEnvBalanceC11F; 120 sbrEnvData->hufftableBalanceFreqL = bookSbrEnvBalanceL11F; 121 122 /*Right/Left - coding */ 123 sbrEnvData->hufftableTimeC = v_Huff_envelopeLevelC11T; 124 sbrEnvData->hufftableTimeL = v_Huff_envelopeLevelL11T; 125 sbrEnvData->hufftableFreqC = v_Huff_envelopeLevelC11F; 126 sbrEnvData->hufftableFreqL = v_Huff_envelopeLevelL11F; 127 128 sbrEnvData->codeBookScfLavBalance = CODE_BOOK_SCF_LAV_BALANCE11; 129 sbrEnvData->codeBookScfLav = CODE_BOOK_SCF_LAV11; 130 131 sbrEnvData->si_sbr_start_env_bits = SI_SBR_START_ENV_BITS_AMP_RES_3_0; 132 sbrEnvData->si_sbr_start_env_bits_balance = SI_SBR_START_ENV_BITS_BALANCE_AMP_RES_3_0; 133 break; 134 135 case SBR_AMP_RES_1_5: 136 /*envelope data*/ 137 138 /*Level/Pan - coding */ 139 sbrEnvData->hufftableLevelTimeC = v_Huff_envelopeLevelC10T; 140 sbrEnvData->hufftableLevelTimeL = v_Huff_envelopeLevelL10T; 141 sbrEnvData->hufftableBalanceTimeC = bookSbrEnvBalanceC10T; 142 sbrEnvData->hufftableBalanceTimeL = bookSbrEnvBalanceL10T; 143 144 sbrEnvData->hufftableLevelFreqC = v_Huff_envelopeLevelC10F; 145 sbrEnvData->hufftableLevelFreqL = v_Huff_envelopeLevelL10F; 146 sbrEnvData->hufftableBalanceFreqC = bookSbrEnvBalanceC10F; 147 sbrEnvData->hufftableBalanceFreqL = bookSbrEnvBalanceL10F; 148 149 /*Right/Left - coding */ 150 sbrEnvData->hufftableTimeC = v_Huff_envelopeLevelC10T; 151 sbrEnvData->hufftableTimeL = v_Huff_envelopeLevelL10T; 152 sbrEnvData->hufftableFreqC = v_Huff_envelopeLevelC10F; 153 sbrEnvData->hufftableFreqL = v_Huff_envelopeLevelL10F; 154 155 sbrEnvData->codeBookScfLavBalance = CODE_BOOK_SCF_LAV_BALANCE10; 156 sbrEnvData->codeBookScfLav = CODE_BOOK_SCF_LAV10; 157 158 sbrEnvData->si_sbr_start_env_bits = SI_SBR_START_ENV_BITS_AMP_RES_1_5; 159 sbrEnvData->si_sbr_start_env_bits_balance = SI_SBR_START_ENV_BITS_BALANCE_AMP_RES_1_5; 160 break; 161 162 default: 163 return (1); /* undefined amp_res mode */ 164 } 165 166 /* these are common to both amp_res values */ 167 /*Noise data*/ 168 169 /*Level/Pan - coding */ 170 sbrEnvData->hufftableNoiseLevelTimeC = v_Huff_NoiseLevelC11T; 171 sbrEnvData->hufftableNoiseLevelTimeL = v_Huff_NoiseLevelL11T; 172 sbrEnvData->hufftableNoiseBalanceTimeC = bookSbrNoiseBalanceC11T; 173 sbrEnvData->hufftableNoiseBalanceTimeL = bookSbrNoiseBalanceL11T; 174 175 sbrEnvData->hufftableNoiseLevelFreqC = v_Huff_envelopeLevelC11F; 176 sbrEnvData->hufftableNoiseLevelFreqL = v_Huff_envelopeLevelL11F; 177 sbrEnvData->hufftableNoiseBalanceFreqC = bookSbrEnvBalanceC11F; 178 sbrEnvData->hufftableNoiseBalanceFreqL = bookSbrEnvBalanceL11F; 179 180 181 /*Right/Left - coding */ 182 sbrEnvData->hufftableNoiseTimeC = v_Huff_NoiseLevelC11T; 183 sbrEnvData->hufftableNoiseTimeL = v_Huff_NoiseLevelL11T; 184 sbrEnvData->hufftableNoiseFreqC = v_Huff_envelopeLevelC11F; 185 sbrEnvData->hufftableNoiseFreqL = v_Huff_envelopeLevelL11F; 186 187 sbrEnvData->si_sbr_start_noise_bits = SI_SBR_START_NOISE_BITS_AMP_RES_3_0; 188 sbrEnvData->si_sbr_start_noise_bits_balance = SI_SBR_START_NOISE_BITS_BALANCE_AMP_RES_3_0; 189 190 191 /* init envelope tables and codebooks */ 192 henv->codeBookScfLavBalanceTime = sbrEnvData->codeBookScfLavBalance; 193 henv->codeBookScfLavBalanceFreq = sbrEnvData->codeBookScfLavBalance; 194 henv->codeBookScfLavLevelTime = sbrEnvData->codeBookScfLav; 195 henv->codeBookScfLavLevelFreq = sbrEnvData->codeBookScfLav; 196 henv->codeBookScfLavTime = sbrEnvData->codeBookScfLav; 197 henv->codeBookScfLavFreq = sbrEnvData->codeBookScfLav; 198 199 henv->hufftableLevelTimeL = sbrEnvData->hufftableLevelTimeL; 200 henv->hufftableBalanceTimeL = sbrEnvData->hufftableBalanceTimeL; 201 henv->hufftableTimeL = sbrEnvData->hufftableTimeL; 202 henv->hufftableLevelFreqL = sbrEnvData->hufftableLevelFreqL; 203 henv->hufftableBalanceFreqL = sbrEnvData->hufftableBalanceFreqL; 204 henv->hufftableFreqL = sbrEnvData->hufftableFreqL; 205 206 henv->codeBookScfLavFreq = sbrEnvData->codeBookScfLav; 207 henv->codeBookScfLavTime = sbrEnvData->codeBookScfLav; 208 209 henv->start_bits = sbrEnvData->si_sbr_start_env_bits; 210 henv->start_bits_balance = sbrEnvData->si_sbr_start_env_bits_balance; 211 212 213 /* init noise tables and codebooks */ 214 215 hnoise->codeBookScfLavBalanceTime = CODE_BOOK_SCF_LAV_BALANCE11; 216 hnoise->codeBookScfLavBalanceFreq = CODE_BOOK_SCF_LAV_BALANCE11; 217 hnoise->codeBookScfLavLevelTime = CODE_BOOK_SCF_LAV11; 218 hnoise->codeBookScfLavLevelFreq = CODE_BOOK_SCF_LAV11; 219 hnoise->codeBookScfLavTime = CODE_BOOK_SCF_LAV11; 220 hnoise->codeBookScfLavFreq = CODE_BOOK_SCF_LAV11; 221 222 hnoise->hufftableLevelTimeL = sbrEnvData->hufftableNoiseLevelTimeL; 223 hnoise->hufftableBalanceTimeL = sbrEnvData->hufftableNoiseBalanceTimeL; 224 hnoise->hufftableTimeL = sbrEnvData->hufftableNoiseTimeL; 225 hnoise->hufftableLevelFreqL = sbrEnvData->hufftableNoiseLevelFreqL; 226 hnoise->hufftableBalanceFreqL = sbrEnvData->hufftableNoiseBalanceFreqL; 227 hnoise->hufftableFreqL = sbrEnvData->hufftableNoiseFreqL; 228 229 230 hnoise->start_bits = sbrEnvData->si_sbr_start_noise_bits; 231 hnoise->start_bits_balance = sbrEnvData->si_sbr_start_noise_bits_balance; 232 233 /* No delta coding in time from the previous frame due to 1.5dB FIx-FIX rule */ 234 henv->upDate = 0; 235 hnoise->upDate = 0; 236 return (0); 237 } 238 239 /******************************************************************************* 240 Functionname: indexLow2High 241 ******************************************************************************* 242 243 Description: Nice small patch-functions in order to cope with non-factor-2 244 ratios between high-res and low-res 245 246 Arguments: INT offset, INT index, FREQ_RES res 247 248 Return: INT 249 250 *******************************************************************************/ 251 static INT indexLow2High(INT offset, INT index, FREQ_RES res) 252 { 253 254 if(res == FREQ_RES_LOW) 255 { 256 if (offset >= 0) 257 { 258 if (index < offset) 259 return(index); 260 else 261 return(2*index - offset); 262 } 263 else 264 { 265 offset = -offset; 266 if (index < offset) 267 return(2*index+index); 268 else 269 return(2*index + offset); 270 } 271 } 272 else 273 return(index); 274 } 275 276 277 278 /******************************************************************************* 279 Functionname: mapLowResEnergyVal 280 ******************************************************************************* 281 282 Description: 283 284 Arguments: INT currVal,INT* prevData, INT offset, INT index, FREQ_RES res 285 286 Return: none 287 288 *******************************************************************************/ 289 static void mapLowResEnergyVal(SCHAR currVal, SCHAR* prevData, INT offset, INT index, FREQ_RES res) 290 { 291 292 if(res == FREQ_RES_LOW) 293 { 294 if (offset >= 0) 295 { 296 if(index < offset) 297 prevData[index] = currVal; 298 else 299 { 300 prevData[2*index - offset] = currVal; 301 prevData[2*index+1 - offset] = currVal; 302 } 303 } 304 else 305 { 306 offset = -offset; 307 if (index < offset) 308 { 309 prevData[3*index] = currVal; 310 prevData[3*index+1] = currVal; 311 prevData[3*index+2] = currVal; 312 } 313 else 314 { 315 prevData[2*index + offset] = currVal; 316 prevData[2*index + 1 + offset] = currVal; 317 } 318 } 319 } 320 else 321 prevData[index] = currVal; 322 } 323 324 325 326 /******************************************************************************* 327 Functionname: computeBits 328 ******************************************************************************* 329 330 Description: 331 332 Arguments: INT delta, 333 INT codeBookScfLavLevel, 334 INT codeBookScfLavBalance, 335 const UCHAR * hufftableLevel, 336 const UCHAR * hufftableBalance, INT coupling, INT channel) 337 338 Return: INT 339 340 *******************************************************************************/ 341 static INT 342 computeBits (SCHAR *delta, 343 INT codeBookScfLavLevel, 344 INT codeBookScfLavBalance, 345 const UCHAR * hufftableLevel, 346 const UCHAR * hufftableBalance, INT coupling, INT channel) 347 { 348 INT index; 349 INT delta_bits = 0; 350 351 if (coupling) { 352 if (channel == 1) 353 { 354 if (*delta < 0) 355 index = fixMax(*delta, -codeBookScfLavBalance); 356 else 357 index = fixMin(*delta, codeBookScfLavBalance); 358 359 if (index != *delta) { 360 *delta = index; 361 return (10000); 362 } 363 364 delta_bits = hufftableBalance[index + codeBookScfLavBalance]; 365 } 366 else { 367 if (*delta < 0) 368 index = fixMax(*delta, -codeBookScfLavLevel); 369 else 370 index = fixMin(*delta, codeBookScfLavLevel); 371 372 if (index != *delta) { 373 *delta = index; 374 return (10000); 375 } 376 delta_bits = hufftableLevel[index + codeBookScfLavLevel]; 377 } 378 } 379 else { 380 if (*delta < 0) 381 index = fixMax(*delta, -codeBookScfLavLevel); 382 else 383 index = fixMin(*delta, codeBookScfLavLevel); 384 385 if (index != *delta) { 386 *delta = index; 387 return (10000); 388 } 389 delta_bits = hufftableLevel[index + codeBookScfLavLevel]; 390 } 391 392 return (delta_bits); 393 } 394 395 396 397 398 /******************************************************************************* 399 Functionname: FDKsbrEnc_codeEnvelope 400 ******************************************************************************* 401 402 Description: 403 404 Arguments: INT *sfb_nrg, 405 const FREQ_RES *freq_res, 406 SBR_CODE_ENVELOPE * h_sbrCodeEnvelope, 407 INT *directionVec, INT scalable, INT nEnvelopes, INT channel, 408 INT headerActive) 409 410 Return: none 411 h_sbrCodeEnvelope->sfb_nrg_prev is modified ! 412 sfb_nrg is modified 413 h_sbrCodeEnvelope->update is modfied ! 414 *directionVec is modified 415 416 *******************************************************************************/ 417 void 418 FDKsbrEnc_codeEnvelope(SCHAR *sfb_nrg, 419 const FREQ_RES *freq_res, 420 SBR_CODE_ENVELOPE *h_sbrCodeEnvelope, 421 INT *directionVec, 422 INT coupling, 423 INT nEnvelopes, 424 INT channel, 425 INT headerActive) 426 { 427 INT i, no_of_bands, band; 428 FIXP_DBL tmp1,tmp2,tmp3,dF_edge_1stEnv; 429 SCHAR *ptr_nrg; 430 431 INT codeBookScfLavLevelTime; 432 INT codeBookScfLavLevelFreq; 433 INT codeBookScfLavBalanceTime; 434 INT codeBookScfLavBalanceFreq; 435 const UCHAR *hufftableLevelTimeL; 436 const UCHAR *hufftableBalanceTimeL; 437 const UCHAR *hufftableLevelFreqL; 438 const UCHAR *hufftableBalanceFreqL; 439 440 INT offset = h_sbrCodeEnvelope->offset; 441 INT envDataTableCompFactor; 442 443 INT delta_F_bits = 0, delta_T_bits = 0; 444 INT use_dT; 445 446 SCHAR delta_F[MAX_FREQ_COEFFS]; 447 SCHAR delta_T[MAX_FREQ_COEFFS]; 448 SCHAR last_nrg, curr_nrg; 449 450 tmp1 = FL2FXCONST_DBL(0.5f) >> (DFRACT_BITS-16-1); 451 tmp2 = h_sbrCodeEnvelope->dF_edge_1stEnv >> (DFRACT_BITS-16); 452 tmp3 = (FIXP_DBL)(((INT)(LONG)h_sbrCodeEnvelope->dF_edge_incr*h_sbrCodeEnvelope->dF_edge_incr_fac) >> (DFRACT_BITS-16)); 453 454 dF_edge_1stEnv = tmp1 + tmp2 + tmp3; 455 456 if (coupling) { 457 codeBookScfLavLevelTime = h_sbrCodeEnvelope->codeBookScfLavLevelTime; 458 codeBookScfLavLevelFreq = h_sbrCodeEnvelope->codeBookScfLavLevelFreq; 459 codeBookScfLavBalanceTime = h_sbrCodeEnvelope->codeBookScfLavBalanceTime; 460 codeBookScfLavBalanceFreq = h_sbrCodeEnvelope->codeBookScfLavBalanceFreq; 461 hufftableLevelTimeL = h_sbrCodeEnvelope->hufftableLevelTimeL; 462 hufftableBalanceTimeL = h_sbrCodeEnvelope->hufftableBalanceTimeL; 463 hufftableLevelFreqL = h_sbrCodeEnvelope->hufftableLevelFreqL; 464 hufftableBalanceFreqL = h_sbrCodeEnvelope->hufftableBalanceFreqL; 465 } 466 else { 467 codeBookScfLavLevelTime = h_sbrCodeEnvelope->codeBookScfLavTime; 468 codeBookScfLavLevelFreq = h_sbrCodeEnvelope->codeBookScfLavFreq; 469 codeBookScfLavBalanceTime = h_sbrCodeEnvelope->codeBookScfLavTime; 470 codeBookScfLavBalanceFreq = h_sbrCodeEnvelope->codeBookScfLavFreq; 471 hufftableLevelTimeL = h_sbrCodeEnvelope->hufftableTimeL; 472 hufftableBalanceTimeL = h_sbrCodeEnvelope->hufftableTimeL; 473 hufftableLevelFreqL = h_sbrCodeEnvelope->hufftableFreqL; 474 hufftableBalanceFreqL = h_sbrCodeEnvelope->hufftableFreqL; 475 } 476 477 if(coupling == 1 && channel == 1) 478 envDataTableCompFactor = 1; /*should be one when the new huffman-tables are ready*/ 479 else 480 envDataTableCompFactor = 0; 481 482 483 if (h_sbrCodeEnvelope->deltaTAcrossFrames == 0) 484 h_sbrCodeEnvelope->upDate = 0; 485 486 /* no delta coding in time in case of a header */ 487 if (headerActive) 488 h_sbrCodeEnvelope->upDate = 0; 489 490 491 for (i = 0; i < nEnvelopes; i++) 492 { 493 if (freq_res[i] == FREQ_RES_HIGH) 494 no_of_bands = h_sbrCodeEnvelope->nSfb[FREQ_RES_HIGH]; 495 else 496 no_of_bands = h_sbrCodeEnvelope->nSfb[FREQ_RES_LOW]; 497 498 499 ptr_nrg = sfb_nrg; 500 curr_nrg = *ptr_nrg; 501 502 delta_F[0] = curr_nrg >> envDataTableCompFactor; 503 504 if (coupling && channel == 1) 505 delta_F_bits = h_sbrCodeEnvelope->start_bits_balance; 506 else 507 delta_F_bits = h_sbrCodeEnvelope->start_bits; 508 509 510 if(h_sbrCodeEnvelope->upDate != 0) 511 { 512 delta_T[0] = (curr_nrg - h_sbrCodeEnvelope->sfb_nrg_prev[0]) >> envDataTableCompFactor; 513 514 delta_T_bits = computeBits (&delta_T[0], 515 codeBookScfLavLevelTime, 516 codeBookScfLavBalanceTime, 517 hufftableLevelTimeL, 518 hufftableBalanceTimeL, coupling, channel); 519 } 520 521 522 mapLowResEnergyVal(curr_nrg, h_sbrCodeEnvelope->sfb_nrg_prev, offset, 0, freq_res[i]); 523 524 /* ensure that nrg difference is not higher than codeBookScfLavXXXFreq */ 525 if ( coupling && channel == 1 ) { 526 for (band = no_of_bands - 1; band > 0; band--) { 527 if ( ptr_nrg[band] - ptr_nrg[band-1] > codeBookScfLavBalanceFreq ) { 528 ptr_nrg[band-1] = ptr_nrg[band] - codeBookScfLavBalanceFreq; 529 } 530 } 531 for (band = 1; band < no_of_bands; band++) { 532 if ( ptr_nrg[band-1] - ptr_nrg[band] > codeBookScfLavBalanceFreq ) { 533 ptr_nrg[band] = ptr_nrg[band-1] - codeBookScfLavBalanceFreq; 534 } 535 } 536 } 537 else { 538 for (band = no_of_bands - 1; band > 0; band--) { 539 if ( ptr_nrg[band] - ptr_nrg[band-1] > codeBookScfLavLevelFreq ) { 540 ptr_nrg[band-1] = ptr_nrg[band] - codeBookScfLavLevelFreq; 541 } 542 } 543 for (band = 1; band < no_of_bands; band++) { 544 if ( ptr_nrg[band-1] - ptr_nrg[band] > codeBookScfLavLevelFreq ) { 545 ptr_nrg[band] = ptr_nrg[band-1] - codeBookScfLavLevelFreq; 546 } 547 } 548 } 549 550 551 /* Coding loop*/ 552 for (band = 1; band < no_of_bands; band++) 553 { 554 last_nrg = (*ptr_nrg); 555 ptr_nrg++; 556 curr_nrg = (*ptr_nrg); 557 558 delta_F[band] = (curr_nrg - last_nrg) >> envDataTableCompFactor; 559 560 delta_F_bits += computeBits (&delta_F[band], 561 codeBookScfLavLevelFreq, 562 codeBookScfLavBalanceFreq, 563 hufftableLevelFreqL, 564 hufftableBalanceFreqL, coupling, channel); 565 566 if(h_sbrCodeEnvelope->upDate != 0) 567 { 568 delta_T[band] = curr_nrg - h_sbrCodeEnvelope->sfb_nrg_prev[indexLow2High(offset, band, freq_res[i])]; 569 delta_T[band] = delta_T[band] >> envDataTableCompFactor; 570 } 571 572 mapLowResEnergyVal(curr_nrg, h_sbrCodeEnvelope->sfb_nrg_prev, offset, band, freq_res[i]); 573 574 if(h_sbrCodeEnvelope->upDate != 0) 575 { 576 delta_T_bits += computeBits (&delta_T[band], 577 codeBookScfLavLevelTime, 578 codeBookScfLavBalanceTime, 579 hufftableLevelTimeL, 580 hufftableBalanceTimeL, coupling, channel); 581 } 582 } 583 584 /* Replace sfb_nrg with deltacoded samples and set flag */ 585 if (i == 0) { 586 INT tmp_bits; 587 tmp_bits = (((delta_T_bits * dF_edge_1stEnv) >> (DFRACT_BITS-18)) + (FIXP_DBL)1) >> 1; 588 use_dT = (h_sbrCodeEnvelope->upDate != 0 && (delta_F_bits > tmp_bits)); 589 } 590 else 591 use_dT = (delta_T_bits < delta_F_bits && h_sbrCodeEnvelope->upDate != 0); 592 593 if (use_dT) 594 { 595 directionVec[i] = TIME; 596 FDKmemcpy (sfb_nrg, delta_T, no_of_bands * sizeof (SCHAR)); 597 } 598 else { 599 h_sbrCodeEnvelope->upDate = 0; 600 directionVec[i] = FREQ; 601 FDKmemcpy (sfb_nrg, delta_F, no_of_bands * sizeof (SCHAR)); 602 } 603 sfb_nrg += no_of_bands; 604 h_sbrCodeEnvelope->upDate = 1; 605 } 606 607 } 608 609 610 /******************************************************************************* 611 Functionname: FDKsbrEnc_InitSbrCodeEnvelope 612 ******************************************************************************* 613 614 Description: 615 616 Arguments: 617 618 Return: 619 620 *******************************************************************************/ 621 INT 622 FDKsbrEnc_InitSbrCodeEnvelope (HANDLE_SBR_CODE_ENVELOPE h_sbrCodeEnvelope, 623 INT *nSfb, 624 INT deltaTAcrossFrames, 625 FIXP_DBL dF_edge_1stEnv, 626 FIXP_DBL dF_edge_incr) 627 { 628 629 FDKmemclear(h_sbrCodeEnvelope,sizeof(SBR_CODE_ENVELOPE)); 630 631 h_sbrCodeEnvelope->deltaTAcrossFrames = deltaTAcrossFrames; 632 h_sbrCodeEnvelope->dF_edge_1stEnv = dF_edge_1stEnv; 633 h_sbrCodeEnvelope->dF_edge_incr = dF_edge_incr; 634 h_sbrCodeEnvelope->dF_edge_incr_fac = 0; 635 h_sbrCodeEnvelope->upDate = 0; 636 h_sbrCodeEnvelope->nSfb[FREQ_RES_LOW] = nSfb[FREQ_RES_LOW]; 637 h_sbrCodeEnvelope->nSfb[FREQ_RES_HIGH] = nSfb[FREQ_RES_HIGH]; 638 h_sbrCodeEnvelope->offset = 2*h_sbrCodeEnvelope->nSfb[FREQ_RES_LOW] - h_sbrCodeEnvelope->nSfb[FREQ_RES_HIGH]; 639 640 return (0); 641 } 642
