1 2/* ----------------------------------------------------------------------------------------------------------- 3Software License for The Fraunhofer FDK AAC Codec Library for Android 4 5� Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur F�rderung der angewandten Forschung e.V. 6 All rights reserved. 7 8 1. INTRODUCTION 9The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements 10the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio. 11This FDK AAC Codec software is intended to be used on a wide variety of Android devices. 12 13AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual 14audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by 15independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part 16of the MPEG specifications. 17 18Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer) 19may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners 20individually for the purpose of encoding or decoding bit streams in products that are compliant with 21the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license 22these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec 23software may already be covered under those patent licenses when it is used for those licensed purposes only. 24 25Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality, 26are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional 27applications information and documentation. 28 292. COPYRIGHT LICENSE 30 31Redistribution and use in source and binary forms, with or without modification, are permitted without 32payment of copyright license fees provided that you satisfy the following conditions: 33 34You must retain the complete text of this software license in redistributions of the FDK AAC Codec or 35your modifications thereto in source code form. 36 37You must retain the complete text of this software license in the documentation and/or other materials 38provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form. 39You must make available free of charge copies of the complete source code of the FDK AAC Codec and your 40modifications thereto to recipients of copies in binary form. 41 42The name of Fraunhofer may not be used to endorse or promote products derived from this library without 43prior written permission. 44 45You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec 46software or your modifications thereto. 47 48Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software 49and 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." 52 533. NO PATENT LICENSE 54 55NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer, 56ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with 57respect to this software. 58 59You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized 60by appropriate patent licenses. 61 624. DISCLAIMER 63 64This 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 66of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 67CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages, 68including but not limited to procurement of substitute goods or services; loss of use, data, or profits, 69or business interruption, however caused and on any theory of liability, whether in contract, strict 70liability, or tort (including negligence), arising in any way out of the use of this software, even if 71advised of the possibility of such damage. 72 735. CONTACT INFORMATION 74 75Fraunhofer Institute for Integrated Circuits IIS 76Attention: Audio and Multimedia Departments - FDK AAC LL 77Am Wolfsmantel 33 7891058 Erlangen, Germany 79 80www.iis.fraunhofer.de/amm 81amm-info@iis.fraunhofer.de 82----------------------------------------------------------------------------------------------------------- */ 83 84/************************* Fast MPEG AAC Audio Encoder ********************** 85 86 Initial author: A. Groeschel 87 contents/description: channel mapping functionality 88 89******************************************************************************/ 90 91#include "channel_map.h" 92#include "bitenc.h" 93#include "psy_const.h" 94#include "qc_data.h" 95#include "aacEnc_ram.h" 96 97 98/* channel_assignment treats the relationship of Input file channels 99 to the encoder channels. 100 This is necessary because the usual order in RIFF files (.wav) 101 is different from the elements order in the coder given 102 by Table 8.1 (implicit speaker mapping) of the AAC standard. 103 104 In mono and stereo case, this is trivial. 105 In mc case, it looks like this: 106 107 Channel Input file coder chan 1085ch: 109 front center 2 0 (SCE channel) 110 left center 0 1 (1st of 1st CPE) 111 right center 1 2 (2nd of 1st CPE) 112 left surround 3 3 (1st of 2nd CPE) 113 right surround 4 4 (2nd of 2nd CPE) 114 1155.1ch: 116 front center 2 0 (SCE channel) 117 left center 0 1 (1st of 1st CPE) 118 right center 1 2 (2nd of 1st CPE) 119 left surround 4 3 (1st of 2nd CPE) 120 right surround 5 4 (2nd of 2nd CPE) 121 LFE 3 5 (LFE) 122*/ 123 124typedef struct { 125 126 CHANNEL_MODE encoderMode; 127 INT channel_assignment[/*(8)*/12]; 128 129} CHANNEL_ASSIGNMENT_INFO_TAB; 130 131 132static const CHANNEL_ASSIGNMENT_INFO_TAB assignmentInfoTabMpeg[] = 133{ 134 { MODE_INVALID, {-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1} }, /* invalid */ 135 { MODE_1, { 0,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1} }, /* mono */ 136 { MODE_2, { 0, 1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1} }, /* stereo */ 137 { MODE_1_2, { 0, 1, 2,-1,-1,-1,-1,-1,-1,-1,-1,-1} }, /* 3ch */ 138 { MODE_1_2_1, { 0, 1, 2, 3,-1,-1,-1,-1,-1,-1,-1,-1} }, /* 4ch */ 139 { MODE_1_2_2, { 0, 1, 2, 3, 4,-1,-1,-1,-1,-1,-1,-1} }, /* 5ch */ 140 { MODE_1_2_2_1, { 0, 1, 2, 3, 4, 5,-1,-1,-1,-1,-1,-1} }, /* 5.1ch */ 141 { MODE_1_2_2_2_1, { 0, 1, 2, 3, 4, 5, 6, 7,-1,-1,-1,-1} }, /* 7.1ch */ 142 { MODE_7_1_REAR_SURROUND, { 0, 1, 2, 3, 4, 5, 6, 7,-1,-1,-1,-1} }, /* 7.1ch */ 143 { MODE_7_1_FRONT_CENTER, { 0, 1, 2, 3, 4, 5, 6, 7,-1,-1,-1,-1} } /* 7.1ch */ 144}; 145 146static const CHANNEL_ASSIGNMENT_INFO_TAB assignmentInfoTabWav[] = 147{ 148 { MODE_INVALID, {-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1} }, /* invalid */ 149 { MODE_1, { 0,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1} }, /* mono */ 150 { MODE_2, { 0, 1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1} }, /* stereo */ 151 { MODE_1_2, { 2, 0, 1,-1,-1,-1,-1,-1,-1,-1,-1,-1} }, /* 3ch */ 152 { MODE_1_2_1, { 2, 0, 1, 3,-1,-1,-1,-1,-1,-1,-1,-1} }, /* 4ch */ 153 { MODE_1_2_2, { 2, 0, 1, 3, 4,-1,-1,-1,-1,-1,-1,-1} }, /* 5ch */ 154 { MODE_1_2_2_1, { 2, 0, 1, 4, 5, 3,-1,-1,-1,-1,-1,-1} }, /* 5.1ch */ 155 { MODE_1_2_2_2_1, { 2, 6, 7, 0, 1, 4, 5, 3,-1,-1,-1,-1} }, /* 7.1ch */ 156 { MODE_7_1_REAR_SURROUND, { 2, 0, 1, 6, 7, 4, 5, 3,-1,-1,-1,-1} }, /* 7.1ch */ 157 { MODE_7_1_FRONT_CENTER, { 2, 6, 7, 0, 1, 4, 5, 3,-1,-1,-1,-1} }, /* 7.1ch */ 158}; 159 160/* Channel mode configuration tab provides, 161 corresponding number of channels and elements 162*/ 163static const CHANNEL_MODE_CONFIG_TAB channelModeConfig[] = 164{ 165 { MODE_1, 1, 1, 1 }, /* SCE */ 166 { MODE_2, 2, 2, 1 }, /* CPE */ 167 { MODE_1_2, 3, 3, 2 }, /* SCE,CPE */ 168 { MODE_1_2_1, 4, 4, 3 }, /* SCE,CPE,SCE */ 169 { MODE_1_2_2, 5, 5, 3 }, /* SCE,CPE,CPE */ 170 { MODE_1_2_2_1, 6, 5, 4 }, /* SCE,CPE,CPE,LFE */ 171 { MODE_1_2_2_2_1, 8, 7, 5 }, /* SCE,CPE,CPE,CPE,LFE */ 172 { MODE_7_1_REAR_SURROUND, 8, 7, 5 }, 173 { MODE_7_1_FRONT_CENTER, 8, 7, 5 }, 174}; 175 176#define MAX_MODES (sizeof(assignmentInfoTabWav)/sizeof(CHANNEL_ASSIGNMENT_INFO_TAB)) 177 178const INT* FDKaacEnc_getChannelAssignment(CHANNEL_MODE encMode, CHANNEL_ORDER co) 179{ 180 const CHANNEL_ASSIGNMENT_INFO_TAB *pTab; 181 int i; 182 183 if (co == CH_ORDER_MPEG) 184 pTab = assignmentInfoTabMpeg; 185 else 186 pTab = assignmentInfoTabWav; 187 188 for(i=MAX_MODES-1; i>0; i--) { 189 if (encMode== pTab[i].encoderMode) { 190 break; 191 } 192 } 193 return (pTab[i].channel_assignment); 194} 195 196AAC_ENCODER_ERROR FDKaacEnc_DetermineEncoderMode(CHANNEL_MODE* mode, INT nChannels) 197{ 198 INT i; 199 CHANNEL_MODE encMode = MODE_INVALID; 200 201 if (*mode==MODE_UNKNOWN) { 202 for (i=0; i<(INT)sizeof(channelModeConfig)/(INT)sizeof(CHANNEL_MODE_CONFIG_TAB); i++) { 203 if (channelModeConfig[i].nChannels==nChannels) { 204 encMode = channelModeConfig[i].encMode; 205 break; 206 } 207 } 208 *mode = encMode; 209 } 210 else { 211 /* check if valid channel configuration */ 212 if (FDKaacEnc_GetChannelModeConfiguration(*mode)->nChannels==nChannels) { 213 encMode = *mode; 214 } 215 } 216 217 if (encMode==MODE_INVALID) { 218 return AAC_ENC_UNSUPPORTED_CHANNELCONFIG; 219 } 220 221 return AAC_ENC_OK; 222} 223 224static INT FDKaacEnc_initElement (ELEMENT_INFO* elInfo, MP4_ELEMENT_ID elType, INT* cnt, CHANNEL_MODE mode, CHANNEL_ORDER co, INT* it_cnt, const FIXP_DBL relBits) { 225 226 INT error=0; 227 INT counter =*cnt; 228 229 const INT *assign = FDKaacEnc_getChannelAssignment(mode, co); 230 231 elInfo->elType=elType; 232 elInfo->relativeBits = relBits; 233 234 switch(elInfo->elType) { 235 case ID_SCE: case ID_LFE: case ID_CCE: 236 elInfo->nChannelsInEl=1; 237 elInfo->ChannelIndex[0]=assign[counter++]; 238 elInfo->instanceTag=it_cnt[elType]++; 239 240 break; 241 case ID_CPE: 242 elInfo->nChannelsInEl=2; 243 elInfo->ChannelIndex[0]=assign[counter++]; 244 elInfo->ChannelIndex[1]=assign[counter++]; 245 elInfo->instanceTag=it_cnt[elType]++; 246 break; 247 case ID_DSE: 248 elInfo->nChannelsInEl=0; 249 elInfo->ChannelIndex[0]=0; 250 elInfo->ChannelIndex[1]=0; 251 elInfo->instanceTag=it_cnt[elType]++; 252 break; 253 default: error=1; 254 }; 255 *cnt = counter; 256 return error; 257 258} 259 260AAC_ENCODER_ERROR FDKaacEnc_InitChannelMapping(CHANNEL_MODE mode, CHANNEL_ORDER co, CHANNEL_MAPPING* cm) 261{ 262 INT count=0; /* count through coder channels */ 263 INT it_cnt[ID_END+1]; 264 INT i; 265 266 for (i=0; i<ID_END; i++) 267 it_cnt[i]=0; 268 269 FDKmemclear(cm, sizeof(CHANNEL_MAPPING)); 270 271 /* init channel mapping*/ 272 for (i=0; i<(INT)sizeof(channelModeConfig)/(INT)sizeof(CHANNEL_MODE_CONFIG_TAB); i++) { 273 if (channelModeConfig[i].encMode==mode) 274 { 275 cm->encMode = channelModeConfig[i].encMode; 276 cm->nChannels = channelModeConfig[i].nChannels; 277 cm->nChannelsEff = channelModeConfig[i].nChannelsEff; 278 cm->nElements = channelModeConfig[i].nElements; 279 280 break; 281 } 282 } 283 284 /* init element info struct */ 285 switch(mode) { 286 case MODE_1: 287 /* (mono) sce */ 288 FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, (FIXP_DBL)MAXVAL_DBL); 289 break; 290 case MODE_2: 291 /* (stereo) cpe */ 292 FDKaacEnc_initElement(&cm->elInfo[0], ID_CPE, &count, mode, co, it_cnt, (FIXP_DBL)MAXVAL_DBL); 293 break; 294 295 case MODE_1_2: 296 /* sce + cpe */ 297 FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.4f)); 298 FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.6f)); 299 break; 300 301 case MODE_1_2_1: 302 /* sce + cpe + sce */ 303 FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.3f)); 304 FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.4f)); 305 FDKaacEnc_initElement(&cm->elInfo[2], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.3f)); 306 break; 307 308 case MODE_1_2_2: 309 /* sce + cpe + cpe */ 310 FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.26f)); 311 FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.37f)); 312 FDKaacEnc_initElement(&cm->elInfo[2], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.37f)); 313 break; 314 315 case MODE_1_2_2_1: 316 /* (5.1) sce + cpe + cpe + lfe */ 317 FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.24f)); 318 FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.35f)); 319 FDKaacEnc_initElement(&cm->elInfo[2], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.35f)); 320 FDKaacEnc_initElement(&cm->elInfo[3], ID_LFE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.06f)); 321 break; 322 323 case MODE_1_2_2_2_1: 324 case MODE_7_1_REAR_SURROUND: 325 case MODE_7_1_FRONT_CENTER: 326 /* (7.1) sce + cpe + cpe + cpe + lfe */ 327 FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.18f)); 328 FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.26f)); 329 FDKaacEnc_initElement(&cm->elInfo[2], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.26f)); 330 FDKaacEnc_initElement(&cm->elInfo[3], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.26f)); 331 FDKaacEnc_initElement(&cm->elInfo[4], ID_LFE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.04f)); 332 break; 333 default: 334 //*chMap=0; 335 return AAC_ENC_UNSUPPORTED_CHANNELCONFIG; 336 }; 337 338 339 FDK_ASSERT(cm->nElements<=(8)); 340 341 342 return AAC_ENC_OK; 343} 344 345AAC_ENCODER_ERROR FDKaacEnc_InitElementBits(QC_STATE *hQC, 346 CHANNEL_MAPPING *cm, 347 INT bitrateTot, 348 INT averageBitsTot, 349 INT maxChannelBits) 350{ 351 int sc_brTot = CountLeadingBits(bitrateTot); 352 353 switch(cm->encMode) { 354 case MODE_1: 355 hQC->elementBits[0]->chBitrateEl = bitrateTot; 356 357 hQC->elementBits[0]->maxBitsEl = maxChannelBits; 358 359 hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits; 360 break; 361 362 case MODE_2: 363 hQC->elementBits[0]->chBitrateEl = bitrateTot>>1; 364 365 hQC->elementBits[0]->maxBitsEl = 2*maxChannelBits; 366 367 hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits; 368 break; 369 case MODE_1_2: { 370 hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits; 371 hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits; 372 FIXP_DBL sceRate = cm->elInfo[0].relativeBits; 373 FIXP_DBL cpeRate = cm->elInfo[1].relativeBits; 374 375 hQC->elementBits[0]->chBitrateEl = fMult(sceRate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot; 376 hQC->elementBits[1]->chBitrateEl = fMult(cpeRate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1); 377 378 hQC->elementBits[0]->maxBitsEl = maxChannelBits; 379 hQC->elementBits[1]->maxBitsEl = 2*maxChannelBits; 380 break; 381 } 382 case MODE_1_2_1: { 383 /* sce + cpe + sce */ 384 hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits; 385 hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits; 386 hQC->elementBits[2]->relativeBitsEl = cm->elInfo[2].relativeBits; 387 FIXP_DBL sce1Rate = cm->elInfo[0].relativeBits; 388 FIXP_DBL cpeRate = cm->elInfo[1].relativeBits; 389 FIXP_DBL sce2Rate = cm->elInfo[2].relativeBits; 390 391 hQC->elementBits[0]->chBitrateEl = fMult(sce1Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot; 392 hQC->elementBits[1]->chBitrateEl = fMult(cpeRate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1); 393 hQC->elementBits[2]->chBitrateEl = fMult(sce2Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot; 394 395 hQC->elementBits[0]->maxBitsEl = maxChannelBits; 396 hQC->elementBits[1]->maxBitsEl = 2*maxChannelBits; 397 hQC->elementBits[2]->maxBitsEl = maxChannelBits; 398 break; 399 } 400 case MODE_1_2_2: { 401 /* sce + cpe + cpe */ 402 hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits; 403 hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits; 404 hQC->elementBits[2]->relativeBitsEl = cm->elInfo[2].relativeBits; 405 FIXP_DBL sceRate = cm->elInfo[0].relativeBits; 406 FIXP_DBL cpe1Rate = cm->elInfo[1].relativeBits; 407 FIXP_DBL cpe2Rate = cm->elInfo[2].relativeBits; 408 409 hQC->elementBits[0]->chBitrateEl = fMult(sceRate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot; 410 hQC->elementBits[1]->chBitrateEl = fMult(cpe1Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1); 411 hQC->elementBits[2]->chBitrateEl = fMult(cpe2Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1); 412 413 hQC->elementBits[0]->maxBitsEl = maxChannelBits; 414 hQC->elementBits[1]->maxBitsEl = 2*maxChannelBits; 415 hQC->elementBits[2]->maxBitsEl = 2*maxChannelBits; 416 break; 417 } 418 419 case MODE_1_2_2_1: { 420 /* (5.1) sce + cpe + cpe + lfe */ 421 hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits; 422 hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits; 423 hQC->elementBits[2]->relativeBitsEl = cm->elInfo[2].relativeBits; 424 hQC->elementBits[3]->relativeBitsEl = cm->elInfo[3].relativeBits; 425 FIXP_DBL sceRate = cm->elInfo[0].relativeBits; 426 FIXP_DBL cpe1Rate = cm->elInfo[1].relativeBits; 427 FIXP_DBL cpe2Rate = cm->elInfo[2].relativeBits; 428 FIXP_DBL lfeRate = cm->elInfo[3].relativeBits; 429 430 int maxBitsTot = maxChannelBits * 5; /* LFE does not add to bit reservoir */ 431 int sc = CountLeadingBits(fixMax(maxChannelBits,averageBitsTot)); 432 int maxLfeBits = (int) FDKmax ( (INT)((fMult(lfeRate,(FIXP_DBL)(maxChannelBits<<sc))>>sc)<<1), 433 (INT)((fMult(FL2FXCONST_DBL(1.1f/2.f),fMult(lfeRate,(FIXP_DBL)(averageBitsTot<<sc)))<<1)>>sc) ); 434 435 maxChannelBits = (maxBitsTot - maxLfeBits); 436 sc = CountLeadingBits(maxChannelBits); 437 438 maxChannelBits = fMult((FIXP_DBL)maxChannelBits<<sc,GetInvInt(5))>>sc; 439 440 hQC->elementBits[0]->chBitrateEl = fMult(sceRate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot; 441 hQC->elementBits[1]->chBitrateEl = fMult(cpe1Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1); 442 hQC->elementBits[2]->chBitrateEl = fMult(cpe2Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1); 443 hQC->elementBits[3]->chBitrateEl = fMult(lfeRate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot; 444 445 hQC->elementBits[0]->maxBitsEl = maxChannelBits; 446 hQC->elementBits[1]->maxBitsEl = 2*maxChannelBits; 447 hQC->elementBits[2]->maxBitsEl = 2*maxChannelBits; 448 hQC->elementBits[3]->maxBitsEl = maxLfeBits; 449 450 break; 451 } 452 case MODE_7_1_REAR_SURROUND: 453 case MODE_7_1_FRONT_CENTER: 454 case MODE_1_2_2_2_1: { 455 int cpe3Idx = 3; 456 int lfeIdx = 4; 457 458 /* (7.1) sce + cpe + cpe + cpe + lfe */ 459 FIXP_DBL sceRate = hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits; 460 FIXP_DBL cpe1Rate = hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits; 461 FIXP_DBL cpe2Rate = hQC->elementBits[2]->relativeBitsEl = cm->elInfo[2].relativeBits; 462 FIXP_DBL cpe3Rate = hQC->elementBits[cpe3Idx]->relativeBitsEl = cm->elInfo[cpe3Idx].relativeBits; 463 FIXP_DBL lfeRate = hQC->elementBits[lfeIdx]->relativeBitsEl = cm->elInfo[lfeIdx].relativeBits; 464 465 int maxBitsTot = maxChannelBits * 7; /* LFE does not add to bit reservoir */ 466 int sc = CountLeadingBits(fixMax(maxChannelBits,averageBitsTot)); 467 int maxLfeBits = (int) FDKmax ( (INT)((fMult(lfeRate,(FIXP_DBL)(maxChannelBits<<sc))>>sc)<<1), 468 (INT)((fMult(FL2FXCONST_DBL(1.1f/2.f),fMult(lfeRate,(FIXP_DBL)(averageBitsTot<<sc)))<<1)>>sc) ); 469 470 maxChannelBits = (maxBitsTot - maxLfeBits) / 7; 471 472 hQC->elementBits[0]->chBitrateEl = fMult(sceRate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot; 473 hQC->elementBits[1]->chBitrateEl = fMult(cpe1Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1); 474 hQC->elementBits[2]->chBitrateEl = fMult(cpe2Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1); 475 hQC->elementBits[cpe3Idx]->chBitrateEl = fMult(cpe3Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1); 476 hQC->elementBits[lfeIdx]->chBitrateEl = fMult(lfeRate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot; 477 478 hQC->elementBits[0]->maxBitsEl = maxChannelBits; 479 hQC->elementBits[1]->maxBitsEl = 2*maxChannelBits; 480 hQC->elementBits[2]->maxBitsEl = 2*maxChannelBits; 481 hQC->elementBits[cpe3Idx]->maxBitsEl = 2*maxChannelBits; 482 hQC->elementBits[lfeIdx]->maxBitsEl = maxLfeBits; 483 break; 484 } 485 default: 486 return AAC_ENC_UNSUPPORTED_CHANNELCONFIG; 487 } 488 489 return AAC_ENC_OK; 490} 491 492/********************************************************************************/ 493/* */ 494/* function: GetMonoStereoMODE(const CHANNEL_MODE mode) */ 495/* */ 496/* description: Determines encoder setting from channel mode. */ 497/* Multichannel modes are mapped to mono or stereo modes */ 498/* returns MODE_MONO in case of mono, */ 499/* MODE_STEREO in case of stereo */ 500/* MODE_INVALID in case of error */ 501/* */ 502/* input: CHANNEL_MODE mode: Encoder mode (see qc_data.h). */ 503/* output: return: CM_STEREO_MODE monoStereoSetting */ 504/* (MODE_INVALID: error, */ 505/* MODE_MONO: mono */ 506/* MODE_STEREO: stereo). */ 507/* */ 508/* misc: No memory is allocated. */ 509/* */ 510/********************************************************************************/ 511 512ELEMENT_MODE FDKaacEnc_GetMonoStereoMode(const CHANNEL_MODE mode){ 513 514 ELEMENT_MODE monoStereoSetting = EL_MODE_INVALID; 515 516 switch(mode){ 517 case MODE_1: /* mono setups */ 518 monoStereoSetting = EL_MODE_MONO; 519 break; 520 case MODE_2: /* stereo setups */ 521 case MODE_1_2: 522 case MODE_1_2_1: 523 case MODE_1_2_2: 524 case MODE_1_2_2_1: 525 case MODE_1_2_2_2_1: 526 case MODE_7_1_REAR_SURROUND: 527 case MODE_7_1_FRONT_CENTER: 528 monoStereoSetting = EL_MODE_STEREO; 529 break; 530 default: /* error */ 531 monoStereoSetting = EL_MODE_INVALID; 532 break; 533 } 534 535 return monoStereoSetting; 536} 537 538const CHANNEL_MODE_CONFIG_TAB* FDKaacEnc_GetChannelModeConfiguration(const CHANNEL_MODE mode) 539{ 540 INT i; 541 const CHANNEL_MODE_CONFIG_TAB *cm_config = NULL; 542 543 /* get channel mode config */ 544 for (i=0; i<(INT)sizeof(channelModeConfig)/(INT)sizeof(CHANNEL_MODE_CONFIG_TAB); i++) { 545 if (channelModeConfig[i].encMode==mode) 546 { 547 cm_config = &channelModeConfig[i]; 548 break; 549 } 550 } 551 return cm_config; 552} 553