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 /***************************** MPEG-4 AAC Encoder ************************** 85 86 Author(s): 87 Description: 88 89 ******************************************************************************/ 90 91 #include "tp_data.h" 92 93 #include "tpenc_lib.h" 94 #include "tpenc_asc.h" 95 #include "FDK_bitstream.h" 96 #include "genericStds.h" 97 98 #define PCE_MAX_ELEMENTS 8 99 100 /** 101 * Describe a PCE based on placed channel elements and element type sequence. 102 */ 103 typedef struct { 104 105 UCHAR num_front_channel_elements; /*!< Number of front channel elements. */ 106 UCHAR num_side_channel_elements; /*!< Number of side channel elements. */ 107 UCHAR num_back_channel_elements; /*!< Number of back channel elements. */ 108 UCHAR num_lfe_channel_elements; /*!< Number of lfe channel elements. */ 109 MP4_ELEMENT_ID el_list[PCE_MAX_ELEMENTS];/*!< List contains sequence describing the elements 110 in present channel mode. (MPEG order) */ 111 } PCE_CONFIGURATION; 112 113 114 /** 115 * Map an incoming channel mode to a existing PCE configuration entry. 116 */ 117 typedef struct { 118 119 CHANNEL_MODE channel_mode; /*!< Present channel mode. */ 120 PCE_CONFIGURATION pce_configuration; /*!< Program config element description. */ 121 122 } CHANNEL_CONFIGURATION; 123 124 125 /** 126 * \brief Table contains all supported channel modes and according PCE configuration description. 127 * 128 * The number of channel element parameter describes the kind of consecutively elements. 129 * E.g. MODE_1_2_2_2_1 means: 130 * - First 3 elements (SCE,CPE,CPE) are front channel elements. 131 * - Next element (CPE) is a back channel element. 132 * - Last element (LFE) is a lfe channel element. 133 */ 134 static const CHANNEL_CONFIGURATION pceConfigTab[] = 135 { 136 { MODE_1, { 1, 0, 0, 0, { ID_SCE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } }, 137 { MODE_2, { 1, 0, 0, 0, { ID_CPE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } }, 138 { MODE_1_2, { 2, 0, 0, 0, { ID_SCE, ID_CPE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } }, 139 { MODE_1_2_1, { 2, 0, 1, 0, { ID_SCE, ID_CPE, ID_SCE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } }, 140 { MODE_1_2_2, { 2, 0, 1, 0, { ID_SCE, ID_CPE, ID_CPE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } }, 141 { MODE_1_2_2_1, { 2, 0, 1, 1, { ID_SCE, ID_CPE, ID_CPE, ID_LFE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } }, 142 { MODE_1_2_2_2_1, { 3, 0, 1, 1, { ID_SCE, ID_CPE, ID_CPE, ID_CPE, ID_LFE, ID_NONE, ID_NONE, ID_NONE } } }, 143 144 145 { MODE_1_1, { 2, 0, 0, 0, { ID_SCE, ID_SCE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } }, 146 { MODE_1_1_1_1, { 2, 2, 0, 0, { ID_SCE, ID_SCE, ID_SCE, ID_SCE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } }, 147 { MODE_1_1_1_1_1_1, { 2, 2, 2, 0, { ID_SCE, ID_SCE, ID_SCE, ID_SCE, ID_SCE, ID_SCE, ID_NONE, ID_NONE } } }, 148 { MODE_1_1_1_1_1_1_1_1, { 3, 2, 3, 0, { ID_SCE, ID_SCE, ID_SCE, ID_SCE, ID_SCE, ID_SCE, ID_SCE, ID_SCE } } }, 149 150 { MODE_2_2, { 1, 0, 1, 0, { ID_CPE, ID_CPE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } }, 151 { MODE_2_2_2, { 1, 1, 1, 0, { ID_CPE, ID_CPE, ID_CPE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } }, 152 { MODE_2_2_2_2, { 4, 0, 0, 0, { ID_CPE, ID_CPE, ID_CPE, ID_CPE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } }, 153 154 { MODE_2_1, { 1, 0, 1, 0, { ID_CPE, ID_SCE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE, ID_NONE } } }, 155 156 { MODE_7_1_REAR_SURROUND, { 2, 0, 2, 1, { ID_SCE, ID_CPE, ID_CPE, ID_CPE, ID_LFE, ID_NONE, ID_NONE, ID_NONE } } }, 157 { MODE_7_1_FRONT_CENTER, { 3, 0, 1, 1, { ID_SCE, ID_CPE, ID_CPE, ID_CPE, ID_LFE, ID_NONE, ID_NONE, ID_NONE } } }, 158 159 }; 160 161 162 /** 163 * \brief Get program config element description for existing channel mode. 164 * 165 * \param channel_mode Current channel mode. 166 * 167 * \return 168 * - Pointer to PCE_CONFIGURATION entry, on success. 169 * - NULL, on failure. 170 */ 171 static const PCE_CONFIGURATION* getPceEntry( 172 const CHANNEL_MODE channel_mode 173 ) 174 { 175 UINT i; 176 const PCE_CONFIGURATION *pce_config = NULL; 177 178 for (i=0; i < (sizeof(pceConfigTab)/sizeof(CHANNEL_CONFIGURATION)); i++) { 179 if (pceConfigTab[i].channel_mode == channel_mode) { 180 pce_config = &pceConfigTab[i].pce_configuration; 181 } 182 } 183 184 return pce_config; 185 } 186 187 int getChannelConfig( CHANNEL_MODE channel_mode ) 188 { 189 INT chan_config = 0; 190 191 switch(channel_mode) { 192 case MODE_1: chan_config = 1; break; 193 case MODE_2: chan_config = 2; break; 194 case MODE_1_2: chan_config = 3; break; 195 case MODE_1_2_1: chan_config = 4; break; 196 case MODE_1_2_2: chan_config = 5; break; 197 case MODE_1_2_2_1: chan_config = 6; break; 198 case MODE_1_2_2_2_1: chan_config = 7; break; 199 200 default: chan_config = 0; 201 } 202 203 return chan_config; 204 } 205 206 CHANNEL_MODE transportEnc_GetChannelMode( int noChannels ) 207 { 208 CHANNEL_MODE chMode; 209 210 if (noChannels <= 8 && noChannels > 0) 211 chMode = (CHANNEL_MODE)((noChannels == 8) ? 7 : noChannels); /* see : iso/mpeg4 v1 audio subpart1*/ 212 else 213 chMode = MODE_UNKNOWN; 214 215 return chMode; 216 } 217 218 #ifdef TP_PCE_ENABLE 219 int transportEnc_writePCE(HANDLE_FDK_BITSTREAM hBs, 220 CHANNEL_MODE channelMode, 221 INT sampleRate, 222 int instanceTagPCE, 223 int profile, 224 int matrixMixdownA, 225 int pseudoSurroundEnable, 226 UINT alignAnchor) 227 { 228 int sampleRateIndex, i; 229 const PCE_CONFIGURATION* config = NULL; 230 const MP4_ELEMENT_ID* pEl_list = NULL; 231 UCHAR cpeCnt=0, sceCnt=0, lfeCnt=0; 232 233 sampleRateIndex = getSamplingRateIndex(sampleRate); 234 if (sampleRateIndex == 15) { 235 return -1; 236 } 237 238 if ((config=getPceEntry(channelMode))==NULL) { 239 return -1; 240 } 241 242 /* Pointer to first element in element list. */ 243 pEl_list = &config->el_list[0]; 244 245 FDKwriteBits(hBs, instanceTagPCE, 4); /* Element instance tag */ 246 FDKwriteBits(hBs, profile, 2); /* Object type */ 247 FDKwriteBits(hBs, sampleRateIndex, 4); /* Sample rate index*/ 248 249 FDKwriteBits(hBs, config->num_front_channel_elements, 4); /* Front channel Elements */ 250 FDKwriteBits(hBs, config->num_side_channel_elements , 4); /* No Side Channel Elements */ 251 FDKwriteBits(hBs, config->num_back_channel_elements , 4); /* No Back channel Elements */ 252 FDKwriteBits(hBs, config->num_lfe_channel_elements , 2); /* No Lfe channel elements */ 253 254 FDKwriteBits(hBs, 0, 3); /* No assoc data elements */ 255 FDKwriteBits(hBs, 0, 4); /* No valid cc elements */ 256 FDKwriteBits(hBs, 0, 1); /* Mono mixdown present */ 257 FDKwriteBits(hBs, 0, 1); /* Stereo mixdown present */ 258 259 if ( matrixMixdownA!=0 && ((channelMode==MODE_1_2_2)||(channelMode==MODE_1_2_2_1)) ) { 260 FDKwriteBits(hBs, 1, 1); /* Matrix mixdown present */ 261 FDKwriteBits(hBs, (matrixMixdownA-1)&0x3, 2); /* matrix_mixdown_idx */ 262 FDKwriteBits(hBs, (pseudoSurroundEnable)?1:0, 1); /* pseudo_surround_enable */ 263 } 264 else { 265 FDKwriteBits(hBs, 0, 1); /* Matrix mixdown not present */ 266 } 267 268 for(i=0; i<config->num_front_channel_elements; i++) { 269 UCHAR isCpe = (*pEl_list++==ID_CPE) ? 1 : 0; 270 UCHAR tag = (isCpe) ? cpeCnt++ : sceCnt++; 271 FDKwriteBits(hBs, isCpe, 1); /* Front channel Elements is CPE? */ 272 FDKwriteBits(hBs, tag, 4); /* Front channel Instance Tag.*/ 273 } 274 for(i=0; i<config->num_side_channel_elements; i++) { 275 UCHAR isCpe = (*pEl_list++==ID_CPE) ? 1 : 0; 276 UCHAR tag = (isCpe) ? cpeCnt++ : sceCnt++; 277 FDKwriteBits(hBs, isCpe, 1); /* Front channel Elements is CPE? */ 278 FDKwriteBits(hBs, tag, 4); /* Front channel Instance Tag.*/ 279 } 280 for(i=0; i<config->num_back_channel_elements; i++) { 281 UCHAR isCpe = (*pEl_list++==ID_CPE) ? 1 : 0; 282 UCHAR tag = (isCpe) ? cpeCnt++ : sceCnt++; 283 FDKwriteBits(hBs, isCpe, 1); /* Front channel Elements is CPE? */ 284 FDKwriteBits(hBs, tag, 4); /* Front channel Instance Tag.*/ 285 } 286 for(i=0; i<config->num_lfe_channel_elements; i++) { 287 FDKwriteBits(hBs, lfeCnt++, 4); /* LFE channel Instance Tag. */ 288 } 289 290 /* - num_valid_cc_elements always 0. 291 - num_assoc_data_elements always 0. */ 292 293 /* Byte alignment: relative to alignAnchor 294 ADTS: align with respect to the first bit of the raw_data_block() 295 ADIF: align with respect to the first bit of the header 296 LATM: align with respect to the first bit of the ASC */ 297 FDKbyteAlign(hBs, alignAnchor); /* Alignment */ 298 299 FDKwriteBits(hBs, 0 ,8); /* Do no write any comment. */ 300 301 /* - comment_field_bytes always 0. */ 302 303 return 0; 304 } 305 306 int transportEnc_GetPCEBits(CHANNEL_MODE channelMode, 307 int matrixMixdownA, 308 int bits) 309 { 310 const PCE_CONFIGURATION* config = NULL; 311 312 if ((config=getPceEntry(channelMode))==NULL) { 313 return -1; /* unsupported channelmapping */ 314 } 315 316 bits += 4 + 2 + 4; /* Element instance tag + Object type + Sample rate index */ 317 bits += 4 + 4 + 4 + 2; /* No (front + side + back + lfe channel) elements */ 318 bits += 3 + 4; /* No (assoc data + valid cc) elements */ 319 bits += 1 + 1 + 1 ; /* Mono + Stereo + Matrix mixdown present */ 320 321 if ( matrixMixdownA!=0 && ((channelMode==MODE_1_2_2)||(channelMode==MODE_1_2_2_1)) ) { 322 bits +=3; /* matrix_mixdown_idx + pseudo_surround_enable */ 323 } 324 325 bits += (1+4) * (INT)config->num_front_channel_elements; 326 bits += (1+4) * (INT)config->num_side_channel_elements; 327 bits += (1+4) * (INT)config->num_back_channel_elements; 328 bits += (4) * (INT)config->num_lfe_channel_elements; 329 330 /* - num_valid_cc_elements always 0. 331 - num_assoc_data_elements always 0. */ 332 333 if ((bits%8) != 0) { 334 bits += (8 - (bits%8)); /* Alignment */ 335 } 336 337 bits += 8; /* Comment field bytes */ 338 339 /* - comment_field_bytes alwys 0. */ 340 341 return bits; 342 } 343 #endif /* TP_PCE_ENABLE */ 344 345 static void writeAot(HANDLE_FDK_BITSTREAM hBitstreamBuffer, AUDIO_OBJECT_TYPE aot) 346 { 347 int tmp = (int) aot; 348 349 if (tmp > 31) { 350 FDKwriteBits( hBitstreamBuffer, AOT_ESCAPE, 5 ); 351 FDKwriteBits( hBitstreamBuffer, tmp-32, 6 ); /* AudioObjectType */ 352 } else { 353 FDKwriteBits( hBitstreamBuffer, tmp, 5 ); 354 } 355 } 356 357 static void writeSampleRate(HANDLE_FDK_BITSTREAM hBitstreamBuffer, int sampleRate) 358 { 359 int sampleRateIndex = getSamplingRateIndex(sampleRate); 360 361 FDKwriteBits( hBitstreamBuffer, sampleRateIndex, 4 ); 362 if( sampleRateIndex == 15 ) { 363 FDKwriteBits( hBitstreamBuffer, sampleRate, 24 ); 364 } 365 } 366 367 #ifdef TP_GA_ENABLE 368 static 369 int transportEnc_writeGASpecificConfig( 370 HANDLE_FDK_BITSTREAM asc, 371 CODER_CONFIG *config, 372 int extFlg, 373 UINT alignAnchor 374 ) 375 { 376 int aot = config->aot; 377 int samplesPerFrame = config->samplesPerFrame; 378 379 /* start of GASpecificConfig according to ISO/IEC 14496-3 Subpart 4, 4.4.1 */ 380 FDKwriteBits( asc, ((samplesPerFrame==960 || samplesPerFrame==480)?1:0), 1); /* frameLengthFlag: 1 for a 960/480 (I)MDCT, 0 for a 1024/512 (I)MDCT*/ 381 FDKwriteBits( asc, 0, 1); /* dependsOnCoreCoder: Sampling Rate Coder Specific, see in ISO/IEC 14496-3 Subpart 4, 4.4.1 */ 382 FDKwriteBits( asc, extFlg, 1 ); /* Extension Flag: Shall be 1 for aot = 17,19,20,21,22,23 */ 383 384 /* Write PCE if channel config is not 1-7 */ 385 if (getChannelConfig(config->channelMode) == 0) { 386 transportEnc_writePCE(asc, config->channelMode, config->samplingRate, 0, 1, config->matrixMixdownA, (config->flags&CC_PSEUDO_SURROUND)?1:0, alignAnchor); 387 } 388 if (extFlg) { 389 if (aot == AOT_ER_BSAC) { 390 FDKwriteBits( asc, config->BSACnumOfSubFrame, 5 ); /* numOfSubFrame */ 391 FDKwriteBits( asc, config->BSAClayerLength, 11 ); /* layer_length */ 392 } 393 if ((aot == AOT_ER_AAC_LC) || (aot == AOT_ER_AAC_LTP) || 394 (aot == AOT_ER_AAC_SCAL) || (aot == AOT_ER_AAC_LD)) 395 { 396 FDKwriteBits( asc, (config->flags & CC_VCB11) ? 1 : 0, 1 ); /* aacSectionDataResillienceFlag */ 397 FDKwriteBits( asc, (config->flags & CC_RVLC) ? 1 : 0, 1 ); /* aacScaleFactorDataResillienceFlag */ 398 FDKwriteBits( asc, (config->flags & CC_HCR) ? 1 : 0, 1 ); /* aacSpectralDataResillienceFlag */ 399 } 400 FDKwriteBits( asc, 0, 1 ); /* extensionFlag3: reserved. Shall be '0' */ 401 } 402 return 0; 403 } 404 #endif /* TP_GA_ENABLE */ 405 406 #ifdef TP_ELD_ENABLE 407 408 static 409 int transportEnc_writeELDSpecificConfig( 410 HANDLE_FDK_BITSTREAM hBs, 411 CODER_CONFIG *config, 412 int epConfig, 413 CSTpCallBacks *cb 414 ) 415 { 416 /* ELD specific config */ 417 if (config->channelMode == MODE_1_1) { 418 return -1; 419 } 420 FDKwriteBits(hBs, (config->samplesPerFrame == 480) ? 1 : 0, 1); 421 422 FDKwriteBits(hBs, (config->flags & CC_VCB11 ) ? 1:0, 1); 423 FDKwriteBits(hBs, (config->flags & CC_RVLC ) ? 1:0, 1); 424 FDKwriteBits(hBs, (config->flags & CC_HCR ) ? 1:0, 1); 425 426 FDKwriteBits(hBs, (config->flags & CC_SBR) ? 1:0, 1); /* SBR header flag */ 427 if ( (config->flags & CC_SBR) ) { 428 FDKwriteBits(hBs, (config->samplingRate == config->extSamplingRate) ? 0:1, 1); /* Samplerate Flag */ 429 FDKwriteBits(hBs, (config->flags & CC_SBRCRC) ? 1:0, 1); /* SBR CRC flag*/ 430 431 if (cb->cbSbr != NULL) { 432 const PCE_CONFIGURATION *pPce; 433 int e; 434 435 pPce = getPceEntry(config->channelMode); 436 437 for (e=0; e<PCE_MAX_ELEMENTS && pPce->el_list[e] != ID_NONE; e++ ) { 438 if ( (pPce->el_list[e] == ID_SCE) || (pPce->el_list[e] == ID_CPE) ) { 439 cb->cbSbr(cb->cbSbrData, hBs, 0, 0, 0, config->aot, pPce->el_list[e], e); 440 } 441 } 442 } 443 } 444 445 FDKwriteBits(hBs, 0, 4); /* ELDEXT_TERM */ 446 447 return 0; 448 } 449 #endif /* TP_ELD_ENABLE */ 450 451 452 int transportEnc_writeASC ( 453 HANDLE_FDK_BITSTREAM asc, 454 CODER_CONFIG *config, 455 CSTpCallBacks *cb 456 ) 457 { 458 UINT extFlag = 0; 459 int err; 460 int epConfig = 0; 461 462 /* Required for the PCE. */ 463 UINT alignAnchor = FDKgetValidBits(asc); 464 465 /* Extension Flag: Shall be 1 for aot = 17,19,20,21,22,23,39 */ 466 switch (config->aot) { 467 case AOT_ER_AAC_LC: 468 case AOT_ER_AAC_LTP: 469 case AOT_ER_AAC_SCAL: 470 case AOT_ER_TWIN_VQ: 471 case AOT_ER_BSAC: 472 case AOT_ER_AAC_LD: 473 case AOT_ER_AAC_ELD: 474 case AOT_USAC: 475 extFlag = 1; 476 break; 477 default: 478 break; 479 } 480 481 if (config->sbrSignaling==SIG_EXPLICIT_HIERARCHICAL && config->sbrPresent) 482 writeAot(asc, config->extAOT); 483 else 484 writeAot(asc, config->aot); 485 486 { 487 writeSampleRate(asc, config->samplingRate); 488 } 489 490 /* Try to guess a reasonable channel mode if not given */ 491 if (config->channelMode == MODE_INVALID) { 492 config->channelMode = transportEnc_GetChannelMode(config->noChannels); 493 if (config->channelMode == MODE_INVALID) 494 return -1; 495 } 496 497 FDKwriteBits( asc, getChannelConfig(config->channelMode), 4 ); 498 499 if (config->sbrSignaling==SIG_EXPLICIT_HIERARCHICAL && config->sbrPresent) { 500 writeSampleRate(asc, config->extSamplingRate); 501 writeAot(asc, config->aot); 502 } 503 504 switch (config->aot) { 505 #ifdef TP_GA_ENABLE 506 case AOT_AAC_MAIN: 507 case AOT_AAC_LC: 508 case AOT_AAC_SSR: 509 case AOT_AAC_LTP: 510 case AOT_AAC_SCAL: 511 case AOT_TWIN_VQ: 512 case AOT_ER_AAC_LC: 513 case AOT_ER_AAC_LTP: 514 case AOT_ER_AAC_SCAL: 515 case AOT_ER_TWIN_VQ: 516 case AOT_ER_BSAC: 517 case AOT_ER_AAC_LD: 518 err = transportEnc_writeGASpecificConfig(asc, config, extFlag, alignAnchor); 519 if (err) 520 return err; 521 break; 522 #endif /* TP_GA_ENABLE */ 523 #ifdef TP_ELD_ENABLE 524 case AOT_ER_AAC_ELD: 525 err = transportEnc_writeELDSpecificConfig(asc, config, epConfig, cb); 526 if (err) 527 return err; 528 break; 529 #endif /* TP_ELD_ENABLE */ 530 default: 531 return -1; 532 } 533 534 switch (config->aot) { 535 case AOT_ER_AAC_LC: 536 case AOT_ER_AAC_LTP: 537 case AOT_ER_AAC_SCAL: 538 case AOT_ER_TWIN_VQ: 539 case AOT_ER_BSAC: 540 case AOT_ER_AAC_LD: 541 case AOT_ER_CELP: 542 case AOT_ER_HVXC: 543 case AOT_ER_HILN: 544 case AOT_ER_PARA: 545 case AOT_ER_AAC_ELD: 546 FDKwriteBits( asc, 0, 2 ); /* epconfig 0 */ 547 break; 548 default: 549 break; 550 } 551 552 /* backward compatible explicit signaling of extension AOT */ 553 if (config->sbrSignaling==SIG_EXPLICIT_BW_COMPATIBLE) 554 { 555 TP_ASC_EXTENSION_ID ascExtId = ASCEXT_UNKOWN; 556 557 if (config->sbrPresent) { 558 ascExtId=ASCEXT_SBR; 559 FDKwriteBits( asc, ascExtId, 11 ); 560 writeAot(asc, config->extAOT); 561 FDKwriteBits( asc, 1, 1 ); /* sbrPresentFlag=1 */ 562 writeSampleRate(asc, config->extSamplingRate); 563 if (config->psPresent) { 564 ascExtId=ASCEXT_PS; 565 FDKwriteBits( asc, ascExtId, 11 ); 566 FDKwriteBits( asc, 1, 1 ); /* psPresentFlag=1 */ 567 } 568 } 569 570 } 571 572 /* Make sure all bits are sync'ed */ 573 FDKsyncCache( asc ); 574 575 return 0; 576 } 577
