libAACenc/src/channel_map.cpp

   1
   2 /* -----------------------------------------------------------------------------------------------------------
   3 Software License for The Fraunhofer FDK AAC Codec Library for Android
   4
   5 © Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur Förderung 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@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
 108 5ch:
 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
 115 5.1ch:
 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
 124 typedef struct {
 125
 126   CHANNEL_MODE  encoderMode;
 127   INT           channel_assignment[/*(8)*/12];
 128
 129 } CHANNEL_ASSIGNMENT_INFO_TAB;
 130
 131
 132 static 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
 146 static 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 static const CHANNEL_ASSIGNMENT_INFO_TAB assignmentInfoTabWg4[] =
 161 {
 162      { MODE_INVALID,                 {-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1} },  /*  invalid   */
 163      { MODE_1,                       { 0,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1} },  /*  mono      */
 164      { MODE_2,                       { 0, 1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1} },  /*  stereo    */
 165      { MODE_1_2,                     { 2, 0, 1,-1,-1,-1,-1,-1,-1,-1,-1,-1} },  /*  3ch       */
 166      { MODE_1_2_1,                   { 3, 0, 1, 2,-1,-1,-1,-1,-1,-1,-1,-1} },  /*  4ch       */
 167      { MODE_1_2_2,                   { 4, 0, 1, 2, 3,-1,-1,-1,-1,-1,-1,-1} },  /*  5ch       */
 168      { MODE_1_2_2_1,                 { 4, 0, 1, 2, 3, 5,-1,-1,-1,-1,-1,-1} },  /*  5.1ch     */
 169      { MODE_1_2_2_2_1,               { 6, 0, 1, 2, 3, 4, 5, 7,-1,-1,-1,-1} },  /*  7.1ch     */
 170 };
 171
 172 /* Channel mode configuration tab provides,
 173    corresponding number of channels and elements
 174 */
 175 static const CHANNEL_MODE_CONFIG_TAB channelModeConfig[] =
 176 {
 177    { MODE_1,                        1,  1,  1 },   /* SCE                 */
 178    { MODE_2,                        2,  2,  1 },   /* CPE                 */
 179    { MODE_1_2,                      3,  3,  2 },   /* SCE,CPE             */
 180    { MODE_1_2_1,                    4,  4,  3 },   /* SCE,CPE,SCE         */
 181    { MODE_1_2_2,                    5,  5,  3 },   /* SCE,CPE,CPE         */
 182    { MODE_1_2_2_1,                  6,  5,  4 },   /* SCE,CPE,CPE,LFE     */
 183    { MODE_1_2_2_2_1,                8,  7,  5 },   /* SCE,CPE,CPE,CPE,LFE */
 184    { MODE_7_1_REAR_SURROUND,        8,  7,  5 },
 185    { MODE_7_1_FRONT_CENTER,         8,  7,  5 },
 186 };
 187
 188 #define MAX_MODES (sizeof(assignmentInfoTabWav)/sizeof(CHANNEL_ASSIGNMENT_INFO_TAB))
 189
 190 const INT* FDKaacEnc_getChannelAssignment(CHANNEL_MODE encMode, CHANNEL_ORDER co)
 191 {
 192   const CHANNEL_ASSIGNMENT_INFO_TAB *pTab;
 193   int i;
 194
 195   if (co == CH_ORDER_MPEG)
 196     pTab = assignmentInfoTabMpeg;
 197   else if (co == CH_ORDER_WAV)
 198     pTab = assignmentInfoTabWav;
 199   else
 200     pTab = assignmentInfoTabWg4;
 201
 202   for(i=MAX_MODES-1; i>0; i--) {
 203     if (encMode== pTab[i].encoderMode) {
 204       break;
 205     }
 206   }
 207   return (pTab[i].channel_assignment);
 208 }
 209
 210 AAC_ENCODER_ERROR FDKaacEnc_DetermineEncoderMode(CHANNEL_MODE* mode, INT nChannels)
 211 {
 212   INT i;
 213   CHANNEL_MODE encMode = MODE_INVALID;
 214
 215   if (*mode==MODE_UNKNOWN) {
 216     for (i=0; i<(INT)sizeof(channelModeConfig)/(INT)sizeof(CHANNEL_MODE_CONFIG_TAB); i++) {
 217       if (channelModeConfig[i].nChannels==nChannels) {
 218           encMode = channelModeConfig[i].encMode;
 219           break;
 220       }
 221     }
 222     *mode = encMode;
 223   }
 224   else {
 225     /* check if valid channel configuration */
 226     if (FDKaacEnc_GetChannelModeConfiguration(*mode)->nChannels==nChannels) {
 227         encMode = *mode;
 228     }
 229   }
 230
 231   if (encMode==MODE_INVALID) {
 232     return AAC_ENC_UNSUPPORTED_CHANNELCONFIG;
 233   }
 234
 235   return AAC_ENC_OK;
 236 }
 237
 238 static 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) {
 239
 240   INT error=0;
 241   INT counter =*cnt;
 242
 243   const INT *assign = FDKaacEnc_getChannelAssignment(mode, co);
 244
 245   elInfo->elType=elType;
 246   elInfo->relativeBits = relBits;
 247
 248   switch(elInfo->elType) {
 249   case ID_SCE: case ID_LFE: case ID_CCE:
 250     elInfo->nChannelsInEl=1;
 251     elInfo->ChannelIndex[0]=assign[counter++];
 252     elInfo->instanceTag=it_cnt[elType]++;
 253
 254     break;
 255   case ID_CPE:
 256     elInfo->nChannelsInEl=2;
 257     elInfo->ChannelIndex[0]=assign[counter++];
 258     elInfo->ChannelIndex[1]=assign[counter++];
 259     elInfo->instanceTag=it_cnt[elType]++;
 260     break;
 261   case ID_DSE:
 262     elInfo->nChannelsInEl=0;
 263     elInfo->ChannelIndex[0]=0;
 264     elInfo->ChannelIndex[1]=0;
 265     elInfo->instanceTag=it_cnt[elType]++;
 266     break;
 267   default: error=1;
 268   };
 269   *cnt = counter;
 270   return error;
 271
 272 }
 273
 274 AAC_ENCODER_ERROR FDKaacEnc_InitChannelMapping(CHANNEL_MODE mode, CHANNEL_ORDER co, CHANNEL_MAPPING* cm)
 275 {
 276   INT count=0; /* count through coder channels */
 277   INT it_cnt[ID_END+1];
 278   INT i;
 279
 280   for (i=0; i<ID_END; i++)
 281     it_cnt[i]=0;
 282
 283   FDKmemclear(cm, sizeof(CHANNEL_MAPPING));
 284
 285   /* init channel mapping*/
 286   for (i=0; i<(INT)sizeof(channelModeConfig)/(INT)sizeof(CHANNEL_MODE_CONFIG_TAB); i++) {
 287     if (channelModeConfig[i].encMode==mode)
 288     {
 289         cm->encMode      = channelModeConfig[i].encMode;
 290         cm->nChannels    = channelModeConfig[i].nChannels;
 291         cm->nChannelsEff = channelModeConfig[i].nChannelsEff;
 292         cm->nElements    = channelModeConfig[i].nElements;
 293
 294         break;
 295     }
 296   }
 297
 298   /* init element info struct */
 299   switch(mode) {
 300     case MODE_1:
 301       /* (mono) sce  */
 302       FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, (FIXP_DBL)MAXVAL_DBL);
 303       break;
 304     case MODE_2:
 305       /* (stereo) cpe */
 306       FDKaacEnc_initElement(&cm->elInfo[0], ID_CPE, &count, mode, co, it_cnt, (FIXP_DBL)MAXVAL_DBL);
 307       break;
 308
 309     case MODE_1_2:
 310       /* sce + cpe */
 311       FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.4f));
 312       FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.6f));
 313       break;
 314
 315     case MODE_1_2_1:
 316       /* sce + cpe + sce */
 317       FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.3f));
 318       FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.4f));
 319       FDKaacEnc_initElement(&cm->elInfo[2], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.3f));
 320       break;
 321
 322     case MODE_1_2_2:
 323       /* sce + cpe + cpe */
 324       FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.26f));
 325       FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.37f));
 326       FDKaacEnc_initElement(&cm->elInfo[2], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.37f));
 327       break;
 328
 329     case MODE_1_2_2_1:
 330       /* (5.1) sce + cpe + cpe + lfe */
 331       FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.24f));
 332       FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.35f));
 333       FDKaacEnc_initElement(&cm->elInfo[2], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.35f));
 334       FDKaacEnc_initElement(&cm->elInfo[3], ID_LFE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.06f));
 335       break;
 336
 337     case MODE_1_2_2_2_1:
 338     case MODE_7_1_REAR_SURROUND:
 339     case MODE_7_1_FRONT_CENTER:
 340       /* (7.1) sce + cpe + cpe + cpe + lfe */
 341       FDKaacEnc_initElement(&cm->elInfo[0], ID_SCE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.18f));
 342       FDKaacEnc_initElement(&cm->elInfo[1], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.26f));
 343       FDKaacEnc_initElement(&cm->elInfo[2], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.26f));
 344       FDKaacEnc_initElement(&cm->elInfo[3], ID_CPE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.26f));
 345       FDKaacEnc_initElement(&cm->elInfo[4], ID_LFE, &count, mode, co, it_cnt, FL2FXCONST_DBL(0.04f));
 346       break;
 347     default:
 348       //*chMap=0;
 349       return AAC_ENC_UNSUPPORTED_CHANNELCONFIG;
 350   };
 351
 352
 353   FDK_ASSERT(cm->nElements<=(8));
 354
 355
 356   return AAC_ENC_OK;
 357 }
 358
 359 AAC_ENCODER_ERROR FDKaacEnc_InitElementBits(QC_STATE *hQC,
 360                     CHANNEL_MAPPING *cm,
 361                     INT bitrateTot,
 362                     INT averageBitsTot,
 363                     INT maxChannelBits)
 364 {
 365   int sc_brTot = CountLeadingBits(bitrateTot);
 366
 367   switch(cm->encMode) {
 368   case MODE_1:
 369     hQC->elementBits[0]->chBitrateEl      = bitrateTot;
 370
 371     hQC->elementBits[0]->maxBitsEl        = maxChannelBits;
 372
 373     hQC->elementBits[0]->relativeBitsEl   = cm->elInfo[0].relativeBits;
 374     break;
 375
 376   case MODE_2:
 377     hQC->elementBits[0]->chBitrateEl      = bitrateTot>>1;
 378
 379     hQC->elementBits[0]->maxBitsEl        = 2*maxChannelBits;
 380
 381     hQC->elementBits[0]->relativeBitsEl   = cm->elInfo[0].relativeBits;
 382     break;
 383   case MODE_1_2: {
 384     hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits;
 385     hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits;
 386     FIXP_DBL sceRate = cm->elInfo[0].relativeBits;
 387     FIXP_DBL cpeRate = cm->elInfo[1].relativeBits;
 388
 389     hQC->elementBits[0]->chBitrateEl      = fMult(sceRate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
 390     hQC->elementBits[1]->chBitrateEl      = fMult(cpeRate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
 391
 392     hQC->elementBits[0]->maxBitsEl        = maxChannelBits;
 393     hQC->elementBits[1]->maxBitsEl        = 2*maxChannelBits;
 394     break;
 395   }
 396   case MODE_1_2_1: {
 397     /* sce + cpe + sce */
 398     hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits;
 399     hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits;
 400     hQC->elementBits[2]->relativeBitsEl = cm->elInfo[2].relativeBits;
 401     FIXP_DBL sce1Rate = cm->elInfo[0].relativeBits;
 402     FIXP_DBL cpeRate  = cm->elInfo[1].relativeBits;
 403     FIXP_DBL sce2Rate = cm->elInfo[2].relativeBits;
 404
 405     hQC->elementBits[0]->chBitrateEl      = fMult(sce1Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
 406     hQC->elementBits[1]->chBitrateEl      = fMult(cpeRate,  (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
 407     hQC->elementBits[2]->chBitrateEl      = fMult(sce2Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
 408
 409     hQC->elementBits[0]->maxBitsEl        = maxChannelBits;
 410     hQC->elementBits[1]->maxBitsEl        = 2*maxChannelBits;
 411     hQC->elementBits[2]->maxBitsEl        = maxChannelBits;
 412     break;
 413   }
 414   case MODE_1_2_2: {
 415     /* sce + cpe + cpe */
 416     hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits;
 417     hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits;
 418     hQC->elementBits[2]->relativeBitsEl = cm->elInfo[2].relativeBits;
 419     FIXP_DBL sceRate  = cm->elInfo[0].relativeBits;
 420     FIXP_DBL cpe1Rate = cm->elInfo[1].relativeBits;
 421     FIXP_DBL cpe2Rate = cm->elInfo[2].relativeBits;
 422
 423     hQC->elementBits[0]->chBitrateEl      = fMult(sceRate,  (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
 424     hQC->elementBits[1]->chBitrateEl      = fMult(cpe1Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
 425     hQC->elementBits[2]->chBitrateEl      = fMult(cpe2Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
 426
 427     hQC->elementBits[0]->maxBitsEl        = maxChannelBits;
 428     hQC->elementBits[1]->maxBitsEl        = 2*maxChannelBits;
 429     hQC->elementBits[2]->maxBitsEl        = 2*maxChannelBits;
 430     break;
 431   }
 432
 433   case MODE_1_2_2_1: {
 434     /* (5.1) sce + cpe + cpe + lfe */
 435     hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits;
 436     hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits;
 437     hQC->elementBits[2]->relativeBitsEl = cm->elInfo[2].relativeBits;
 438     hQC->elementBits[3]->relativeBitsEl = cm->elInfo[3].relativeBits;
 439     FIXP_DBL sceRate  = cm->elInfo[0].relativeBits;
 440     FIXP_DBL cpe1Rate = cm->elInfo[1].relativeBits;
 441     FIXP_DBL cpe2Rate = cm->elInfo[2].relativeBits;
 442     FIXP_DBL lfeRate  = cm->elInfo[3].relativeBits;
 443
 444     int maxBitsTot = maxChannelBits * 5; /* LFE does not add to bit reservoir */
 445     int sc = CountLeadingBits(fixMax(maxChannelBits,averageBitsTot));
 446     int maxLfeBits = (int) FDKmax ( (INT)((fMult(lfeRate,(FIXP_DBL)(maxChannelBits<<sc))>>sc)<<1),
 447                                     (INT)((fMult(FL2FXCONST_DBL(1.1f/2.f),fMult(lfeRate,(FIXP_DBL)(averageBitsTot<<sc)))<<1)>>sc) );
 448
 449     maxChannelBits = (maxBitsTot - maxLfeBits);
 450     sc = CountLeadingBits(maxChannelBits);
 451
 452     maxChannelBits = fMult((FIXP_DBL)maxChannelBits<<sc,GetInvInt(5))>>sc;
 453
 454     hQC->elementBits[0]->chBitrateEl      = fMult(sceRate,  (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
 455     hQC->elementBits[1]->chBitrateEl      = fMult(cpe1Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
 456     hQC->elementBits[2]->chBitrateEl      = fMult(cpe2Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
 457     hQC->elementBits[3]->chBitrateEl      = fMult(lfeRate,  (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
 458
 459     hQC->elementBits[0]->maxBitsEl        = maxChannelBits;
 460     hQC->elementBits[1]->maxBitsEl        = 2*maxChannelBits;
 461     hQC->elementBits[2]->maxBitsEl        = 2*maxChannelBits;
 462     hQC->elementBits[3]->maxBitsEl        = maxLfeBits;
 463
 464     break;
 465   }
 466   case MODE_7_1_REAR_SURROUND:
 467   case MODE_7_1_FRONT_CENTER:
 468   case MODE_1_2_2_2_1: {
 469     int cpe3Idx = 3;
 470     int lfeIdx  = 4;
 471
 472     /* (7.1) sce + cpe + cpe + cpe + lfe */
 473     FIXP_DBL sceRate  = hQC->elementBits[0]->relativeBitsEl = cm->elInfo[0].relativeBits;
 474     FIXP_DBL cpe1Rate = hQC->elementBits[1]->relativeBitsEl = cm->elInfo[1].relativeBits;
 475     FIXP_DBL cpe2Rate = hQC->elementBits[2]->relativeBitsEl = cm->elInfo[2].relativeBits;
 476     FIXP_DBL cpe3Rate = hQC->elementBits[cpe3Idx]->relativeBitsEl = cm->elInfo[cpe3Idx].relativeBits;
 477     FIXP_DBL lfeRate  = hQC->elementBits[lfeIdx]->relativeBitsEl = cm->elInfo[lfeIdx].relativeBits;
 478
 479     int maxBitsTot = maxChannelBits * 7; /* LFE does not add to bit reservoir */
 480     int sc = CountLeadingBits(fixMax(maxChannelBits,averageBitsTot));
 481     int maxLfeBits = (int) FDKmax ( (INT)((fMult(lfeRate,(FIXP_DBL)(maxChannelBits<<sc))>>sc)<<1),
 482                                     (INT)((fMult(FL2FXCONST_DBL(1.1f/2.f),fMult(lfeRate,(FIXP_DBL)(averageBitsTot<<sc)))<<1)>>sc) );
 483
 484     maxChannelBits = (maxBitsTot - maxLfeBits) / 7;
 485
 486     hQC->elementBits[0]->chBitrateEl = fMult(sceRate,  (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
 487     hQC->elementBits[1]->chBitrateEl = fMult(cpe1Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
 488     hQC->elementBits[2]->chBitrateEl = fMult(cpe2Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
 489     hQC->elementBits[cpe3Idx]->chBitrateEl = fMult(cpe3Rate, (FIXP_DBL)(bitrateTot<<sc_brTot))>>(sc_brTot+1);
 490     hQC->elementBits[lfeIdx]->chBitrateEl = fMult(lfeRate,  (FIXP_DBL)(bitrateTot<<sc_brTot))>>sc_brTot;
 491
 492     hQC->elementBits[0]->maxBitsEl = maxChannelBits;
 493     hQC->elementBits[1]->maxBitsEl = 2*maxChannelBits;
 494     hQC->elementBits[2]->maxBitsEl = 2*maxChannelBits;
 495     hQC->elementBits[cpe3Idx]->maxBitsEl = 2*maxChannelBits;
 496     hQC->elementBits[lfeIdx]->maxBitsEl = maxLfeBits;
 497     break;
 498   }
 499   default:
 500     return AAC_ENC_UNSUPPORTED_CHANNELCONFIG;
 501   }
 502
 503   return AAC_ENC_OK;
 504 }
 505
 506 /********************************************************************************/
 507 /*                                                                              */
 508 /* function:    GetMonoStereoMODE(const CHANNEL_MODE mode)                      */
 509 /*                                                                              */
 510 /* description: Determines encoder setting from channel mode.                   */
 511 /*              Multichannel modes are mapped to mono or stereo modes           */
 512 /*              returns MODE_MONO in case of mono,                           */
 513 /*                      MODE_STEREO in case of stereo                        */
 514 /*                      MODE_INVALID in case of error                        */
 515 /*                                                                              */
 516 /* input:       CHANNEL_MODE mode: Encoder mode (see qc_data.h).                */
 517 /* output:      return: CM_STEREO_MODE monoStereoSetting                        */
 518 /*              (MODE_INVALID: error,                                        */
 519 /*               MODE_MONO:    mono                                          */
 520 /*               MODE_STEREO:  stereo).                                      */
 521 /*                                                                              */
 522 /* misc:        No memory is allocated.                                         */
 523 /*                                                                              */
 524 /********************************************************************************/
 525
 526 ELEMENT_MODE FDKaacEnc_GetMonoStereoMode(const CHANNEL_MODE mode){
 527
 528   ELEMENT_MODE monoStereoSetting = EL_MODE_INVALID;
 529
 530   switch(mode){
 531   case MODE_1:        /* mono setups */
 532     monoStereoSetting = EL_MODE_MONO;
 533     break;
 534   case MODE_2:        /* stereo setups */
 535   case MODE_1_2:
 536   case MODE_1_2_1:
 537   case MODE_1_2_2:
 538   case MODE_1_2_2_1:
 539   case MODE_1_2_2_2_1:
 540   case MODE_7_1_REAR_SURROUND:
 541   case MODE_7_1_FRONT_CENTER:
 542     monoStereoSetting = EL_MODE_STEREO;
 543     break;
 544   default:            /* error */
 545     monoStereoSetting = EL_MODE_INVALID;
 546     break;
 547   }
 548
 549   return monoStereoSetting;
 550 }
 551
 552 const CHANNEL_MODE_CONFIG_TAB* FDKaacEnc_GetChannelModeConfiguration(const CHANNEL_MODE mode)
 553 {
 554   INT i;
 555   const CHANNEL_MODE_CONFIG_TAB *cm_config = NULL;
 556
 557   /* get channel mode config */
 558   for (i=0; i<(INT)sizeof(channelModeConfig)/(INT)sizeof(CHANNEL_MODE_CONFIG_TAB); i++) {
 559     if (channelModeConfig[i].encMode==mode)
 560     {
 561         cm_config = &channelModeConfig[i];
 562         break;
 563     }
 564   }
 565   return cm_config;
 566 }