aboutsummaryrefslogtreecommitdiffstats
path: root/libSBRdec/src/sbrdecoder.cpp
blob: bed23c77e430d167f8a5c4dd18267846fd330515 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
/* -----------------------------------------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android

� Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur F�rderung der angewandten Forschung e.V.
  All rights reserved.

 1.    INTRODUCTION
The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
This FDK AAC Codec software is intended to be used on a wide variety of Android devices.

AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
of the MPEG specifications.

Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
individually for the purpose of encoding or decoding bit streams in products that are compliant with
the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
software may already be covered under those patent licenses when it is used for those licensed purposes only.

Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
applications information and documentation.

2.    COPYRIGHT LICENSE

Redistribution and use in source and binary forms, with or without modification, are permitted without
payment of copyright license fees provided that you satisfy the following conditions:

You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
your modifications thereto in source code form.

You must retain the complete text of this software license in the documentation and/or other materials
provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
modifications thereto to recipients of copies in binary form.

The name of Fraunhofer may not be used to endorse or promote products derived from this library without
prior written permission.

You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
software or your modifications thereto.

Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
and the date of any change. For modified versions of the FDK AAC Codec, the term
"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."

3.    NO PATENT LICENSE

NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
respect to this software.

You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
by appropriate patent licenses.

4.    DISCLAIMER

This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
or business interruption, however caused and on any theory of liability, whether in contract, strict
liability, or tort (including negligence), arising in any way out of the use of this software, even if
advised of the possibility of such damage.

5.    CONTACT INFORMATION

Fraunhofer Institute for Integrated Circuits IIS
Attention: Audio and Multimedia Departments - FDK AAC LL
Am Wolfsmantel 33
91058 Erlangen, Germany

www.iis.fraunhofer.de/amm
amm-info@iis.fraunhofer.de
----------------------------------------------------------------------------------------------------------- */

/*!
  \file
  \brief  SBR decoder frontend
  This module provides a frontend to the SBR decoder. The function openSBR() is called for
  initialization. The function sbrDecoder_Apply() is called for each frame. sbr_Apply() will call the
  required functions to decode the raw SBR data (provided by env_extr.cpp), to decode the envelope data and noise floor levels [decodeSbrData()],
  and to finally apply SBR to the current frame [sbr_dec()].

  \sa sbrDecoder_Apply(), \ref documentationOverview
*/

/*!
  \page documentationOverview Overview of important information resources and source code documentation

  The primary source code documentation is based on generated and cross-referenced HTML files using
  <a HREF="http://www.doxygen.org">doxygen</a>. As part of this documentation
  you can find more extensive descriptions about key concepts and algorithms at the following locations:

  <h2>Programming</h2>

  \li Buffer management: sbrDecoder_Apply() and sbr_dec()
  \li Internal scale factors to maximize SNR on fixed point processors: #QMF_SCALE_FACTOR
  \li Special mantissa-exponent format: Created in requantizeEnvelopeData() and used in calculateSbrEnvelope()

  <h2>Algorithmic details</h2>
  \li About the SBR data format: \ref SBR_HEADER_ELEMENT and \ref SBR_STANDARD_ELEMENT
  \li Details about the bitstream decoder: env_extr.cpp
  \li Details about the QMF filterbank and the provided polyphase implementation: qmf_dec.cpp
  \li Details about the transposer: lpp_tran.cpp
  \li Details about the envelope adjuster: env_calc.cpp

*/

#include "sbrdecoder.h"

#include "FDK_bitstream.h"

#include "sbrdec_freq_sca.h"
#include "env_extr.h"
#include "sbr_dec.h"
#include "env_dec.h"
#include "sbr_crc.h"
#include "sbr_ram.h"
#include "sbr_rom.h"
#include "lpp_tran.h"
#include "transcendent.h"


#include "sbrdec_drc.h"

#include "psbitdec.h"


/* Decoder library info */
#define SBRDECODER_LIB_VL0 2
#define SBRDECODER_LIB_VL1 2
#define SBRDECODER_LIB_VL2 5
#define SBRDECODER_LIB_TITLE "SBR Decoder"
#define SBRDECODER_LIB_BUILD_DATE __DATE__
#define SBRDECODER_LIB_BUILD_TIME __TIME__




static UCHAR getHeaderSlot( UCHAR currentSlot, UCHAR hdrSlotUsage[(1)+1] )
{
  UINT  occupied = 0;
  int   s;
  UCHAR slot = hdrSlotUsage[currentSlot];

  FDK_ASSERT((1)+1 < 32);

  for (s = 0; s < (1)+1; s++) {
    if ( (hdrSlotUsage[s] == slot)
      && (s != slot) ) {
      occupied = 1;
      break;
    }
  }

  if (occupied) {
    occupied = 0;

    for (s = 0; s < (1)+1; s++) {
      occupied |= 1 << hdrSlotUsage[s];
    }
    for (s = 0; s < (1)+1; s++) {
      if ( !(occupied & 0x1) ) {
        slot = s;
        break;
      }
      occupied >>= 1;
    }
  }

  return slot;
}

static void copySbrHeader( HANDLE_SBR_HEADER_DATA hDst, const HANDLE_SBR_HEADER_DATA hSrc )
{
  /* copy the whole header memory (including pointers) */
  FDKmemcpy( hDst, hSrc, sizeof(SBR_HEADER_DATA) );

  /* update pointers */
  hDst->freqBandData.freqBandTable[0]  = hDst->freqBandData.freqBandTableLo;
  hDst->freqBandData.freqBandTable[1] = hDst->freqBandData.freqBandTableHi;
}


/*!
  \brief Reset SBR decoder.

  Reset should only be called if SBR has been sucessfully detected by
  an appropriate checkForPayload() function.

  \return Error code.
*/
static
SBR_ERROR sbrDecoder_ResetElement (
        HANDLE_SBRDECODER    self,
        int                  sampleRateIn,
        int                  sampleRateOut,
        int                  samplesPerFrame,
        const MP4_ELEMENT_ID elementID,
        const int            elementIndex,
        const int            overlap
        )
{
  SBR_ERROR sbrError = SBRDEC_OK;
  HANDLE_SBR_HEADER_DATA hSbrHeader;
  UINT qmfFlags = 0;

  int i, synDownsampleFac;

  /* Check in/out samplerates */
  if ( sampleRateIn < 6400
    || sampleRateIn > 48000
     )
  {
    sbrError = SBRDEC_UNSUPPORTED_CONFIG;
    goto bail;
  }

  if ( sampleRateOut > 96000 )
  {
    sbrError = SBRDEC_UNSUPPORTED_CONFIG;
    goto bail;
  }

  /* Set QMF mode flags */
  if (self->flags & SBRDEC_LOW_POWER)
    qmfFlags |= QMF_FLAG_LP;

  if (self->coreCodec == AOT_ER_AAC_ELD) {
    if (self->flags & SBRDEC_LD_MPS_QMF) {
      qmfFlags |=  QMF_FLAG_MPSLDFB;
    } else {
      qmfFlags |=  QMF_FLAG_CLDFB;
    }
  }

  /* Set downsampling factor for synthesis filter bank */
  if (sampleRateOut == 0)
  {
    /* no single rate mode */
      sampleRateOut = sampleRateIn<<1; /* In case of implicit signalling, assume dual rate SBR */
  }

  if ( sampleRateIn == sampleRateOut ) {
    synDownsampleFac = 2;
  } else {
    synDownsampleFac = 1;
  }

  self->synDownsampleFac = synDownsampleFac;
  self->sampleRateOut = sampleRateOut;

  {
    int i;

    for (i = 0; i < (1)+1; i++)
    {
      hSbrHeader = &(self->sbrHeader[elementIndex][i]);

      /* init a default header such that we can at least do upsampling later */
      sbrError = initHeaderData(
              hSbrHeader,
              sampleRateIn,
              sampleRateOut,
              samplesPerFrame,
              self->flags
              );
    }
  }

  if (sbrError != SBRDEC_OK) {
    goto bail;
  }

  /* Init SBR channels going to be assigned to a SBR element */
  {
    int ch;

    for (ch=0; ch<self->pSbrElement[elementIndex]->nChannels; ch++)
    {
      /* and create sbrDec */
      sbrError = createSbrDec (self->pSbrElement[elementIndex]->pSbrChannel[ch],
                          hSbrHeader,
                         &self->pSbrElement[elementIndex]->transposerSettings,
                          synDownsampleFac,
                          qmfFlags,
                          self->flags,
                          overlap,
                          ch );

      if (sbrError != SBRDEC_OK) {
        goto bail;
      }
    }
  }

  //FDKmemclear(sbr_OverlapBuffer, sizeof(sbr_OverlapBuffer));

  if (self->numSbrElements == 1) {
    switch ( self->coreCodec ) {
    case AOT_AAC_LC:
    case AOT_SBR:
    case AOT_PS:
    case AOT_ER_AAC_SCAL:
    case AOT_DRM_AAC:
    case AOT_DRM_SURROUND:
      if (CreatePsDec ( &self->hParametricStereoDec, samplesPerFrame )) {
        sbrError = SBRDEC_CREATE_ERROR;
        goto bail;
      }
      break;
    default:
      break;
    }
  }

  /* Init frame delay slot handling */
  self->pSbrElement[elementIndex]->useFrameSlot = 0;
  for (i = 0; i < ((1)+1); i++) {
    self->pSbrElement[elementIndex]->useHeaderSlot[i] = i;
  }

bail:

  return sbrError;
}


SBR_ERROR sbrDecoder_Open ( HANDLE_SBRDECODER  * pSelf )
{
  HANDLE_SBRDECODER    self = NULL;
  SBR_ERROR sbrError = SBRDEC_OK;

  /* Get memory for this instance */
  self = GetRam_SbrDecoder();
  if (self == NULL) {
    sbrError = SBRDEC_MEM_ALLOC_FAILED;
    goto bail;
  }

  self->workBuffer1 = GetRam_SbrDecWorkBuffer1();
  self->workBuffer2 = GetRam_SbrDecWorkBuffer2();

  if (  self->workBuffer1 == NULL
     || self->workBuffer2 == NULL )
  {
    sbrError = SBRDEC_MEM_ALLOC_FAILED;
    goto bail;
  }

  /*
  Already zero because of calloc
  self->numSbrElements = 0;
  self->numSbrChannels = 0;
  self->codecFrameSize = 0;
  */

  self->numDelayFrames = (1);  /* set to the max value by default */

  *pSelf = self;

bail:
  return sbrError;
}

/**
 * \brief determine if the given core codec AOT can be processed or not.
 * \param coreCodec core codec audio object type.
 * \return 1 if SBR can be processed, 0 if SBR cannot be processed/applied.
 */
static
int sbrDecoder_isCoreCodecValid(AUDIO_OBJECT_TYPE coreCodec)
{
  switch (coreCodec) {
    case AOT_AAC_LC:
    case AOT_SBR:
    case AOT_PS:
    case AOT_ER_AAC_SCAL:
    case AOT_ER_AAC_ELD:
      return 1;
    default:
      return 0;
  }
}

static
void sbrDecoder_DestroyElement (
        HANDLE_SBRDECODER       self,
        const int               elementIndex
        )
{
  if (self->pSbrElement[elementIndex] != NULL) {
    int ch;

    for (ch=0; ch<SBRDEC_MAX_CH_PER_ELEMENT; ch++) {
      if (self->pSbrElement[elementIndex]->pSbrChannel[ch] != NULL) {
        deleteSbrDec( self->pSbrElement[elementIndex]->pSbrChannel[ch] );
        FreeRam_SbrDecChannel( &self->pSbrElement[elementIndex]->pSbrChannel[ch] );
        self->numSbrChannels -= 1;
      }
    }
    FreeRam_SbrDecElement( &self->pSbrElement[elementIndex] );
    self->numSbrElements -= 1;
  }
}


SBR_ERROR sbrDecoder_InitElement (
        HANDLE_SBRDECODER       self,
        const int               sampleRateIn,
        const int               sampleRateOut,
        const int               samplesPerFrame,
        const AUDIO_OBJECT_TYPE coreCodec,
        const MP4_ELEMENT_ID    elementID,
        const int               elementIndex
        )
{
  SBR_ERROR sbrError = SBRDEC_OK;
  int chCnt=0;
  int nSbrElementsStart = self->numSbrElements;

  /* Check core codec AOT */
  if (! sbrDecoder_isCoreCodecValid(coreCodec) || elementIndex >= (8)) {
    sbrError = SBRDEC_UNSUPPORTED_CONFIG;
    goto bail;
  }

  if ( elementID != ID_SCE && elementID != ID_CPE && elementID != ID_LFE )
  {
    sbrError = SBRDEC_UNSUPPORTED_CONFIG;
    goto bail;
  }

  if (  self->sampleRateIn == sampleRateIn
     && self->codecFrameSize == samplesPerFrame
     && self->coreCodec == coreCodec
     && self->pSbrElement[elementIndex] != NULL
     && self->pSbrElement[elementIndex]->elementID == elementID
     && !(self->flags & SBRDEC_FORCE_RESET)
     )
  {
     /* Nothing to do */
     return SBRDEC_OK;
  }

  self->sampleRateIn = sampleRateIn;
  self->codecFrameSize = samplesPerFrame;
  self->coreCodec = coreCodec;

  self->flags = 0;
  self->flags |= (coreCodec == AOT_ER_AAC_ELD) ? SBRDEC_ELD_GRID : 0;

  /* Init SBR elements */
  {
    int elChannels, ch;

    if (self->pSbrElement[elementIndex] == NULL) {
      self->pSbrElement[elementIndex] = GetRam_SbrDecElement(elementIndex);
      if (self->pSbrElement[elementIndex] == NULL) {
        sbrError = SBRDEC_MEM_ALLOC_FAILED;
        goto bail;
      }
      self->numSbrElements ++;
    } else {
      self->numSbrChannels -= self->pSbrElement[elementIndex]->nChannels;
    }

    /* Save element ID for sanity checks and to have a fallback for concealment. */
    self->pSbrElement[elementIndex]->elementID = elementID;

    /* Determine amount of channels for this element */
    switch (elementID) {
      case ID_NONE:
      case ID_CPE: elChannels=2;
        break;
      case ID_LFE:
      case ID_SCE: elChannels=1;
        break;
      default: elChannels=0;
        break;
    }

    /* Handle case of Parametric Stereo */
    if ( elementIndex == 0 && elementID == ID_SCE ) {
      switch (coreCodec) {
        case AOT_AAC_LC:
        case AOT_SBR:
        case AOT_PS:
        case AOT_ER_AAC_SCAL:
        case AOT_DRM_AAC:
        case AOT_DRM_SURROUND:
          elChannels = 2;
          break;
        default:
          break;
      }
    }

    self->pSbrElement[elementIndex]->nChannels = elChannels;

    for (ch=0; ch<elChannels; ch++)
    {
      if (self->pSbrElement[elementIndex]->pSbrChannel[ch] == NULL) {
        self->pSbrElement[elementIndex]->pSbrChannel[ch] = GetRam_SbrDecChannel(chCnt);
        if (self->pSbrElement[elementIndex]->pSbrChannel[ch] == NULL) {
          sbrError = SBRDEC_MEM_ALLOC_FAILED;
          goto bail;
        }
      }
      self->numSbrChannels ++;

      sbrDecoder_drcInitChannel( &self->pSbrElement[elementIndex]->pSbrChannel[ch]->SbrDec.sbrDrcChannel );

      /* Add reference pointer to workbuffers. */
      self->pSbrElement[elementIndex]->pSbrChannel[ch]->SbrDec.WorkBuffer1 = self->workBuffer1;
      self->pSbrElement[elementIndex]->pSbrChannel[ch]->SbrDec.WorkBuffer2 = self->workBuffer2;
      chCnt++;
    }
    if (elChannels == 1 && self->pSbrElement[elementIndex]->pSbrChannel[ch] != NULL) {
      deleteSbrDec( self->pSbrElement[elementIndex]->pSbrChannel[ch] );
      FreeRam_SbrDecChannel( &self->pSbrElement[elementIndex]->pSbrChannel[ch] );
    }
  }

  /* clear error flags for all delay slots */
  FDKmemclear(self->pSbrElement[elementIndex]->frameErrorFlag, ((1)+1)*sizeof(UCHAR));

  /* Initialize this instance */
  sbrError = sbrDecoder_ResetElement(
          self,
          sampleRateIn,
          sampleRateOut,
          samplesPerFrame,
          elementID,
          elementIndex,
          (coreCodec == AOT_ER_AAC_ELD) ? 0 : (6)
          );



bail:
  if (sbrError != SBRDEC_OK) {
    if (nSbrElementsStart < self->numSbrElements) {
      /* Free the memory allocated for this element */
      sbrDecoder_DestroyElement( self, elementIndex );
    } else if ( (self->pSbrElement[elementIndex] != NULL)
             && (elementIndex < (8)))
    { /* Set error flag to trigger concealment */
      self->pSbrElement[elementIndex]->frameErrorFlag[self->pSbrElement[elementIndex]->useFrameSlot] = 1;
    }
  }

  return sbrError;
}

/**
 * \brief Apply decoded SBR header for one element.
 * \param self SBR decoder instance handle
 * \param hSbrHeader SBR header handle to be processed.
 * \param hSbrChannel pointer array to the SBR element channels corresponding to the SBR header.
 * \param headerStatus header status value returned from SBR header parser.
 * \param numElementChannels amount of channels for the SBR element whos header is to be processed.
 */
static
SBR_ERROR sbrDecoder_HeaderUpdate(
        HANDLE_SBRDECODER self,
        HANDLE_SBR_HEADER_DATA hSbrHeader,
        SBR_HEADER_STATUS headerStatus,
        HANDLE_SBR_CHANNEL hSbrChannel[],
        const int numElementChannels
        )
{
  SBR_ERROR errorStatus = SBRDEC_OK;

  /*
    change of control data, reset decoder
  */
  errorStatus = resetFreqBandTables(hSbrHeader, self->flags);

  if (errorStatus == SBRDEC_OK) {
    if (hSbrHeader->syncState == UPSAMPLING && headerStatus != HEADER_RESET)
    {
      /* As the default header would limit the frequency range,
         lowSubband and highSubband must be patched. */
      hSbrHeader->freqBandData.lowSubband = hSbrHeader->numberOfAnalysisBands;
      hSbrHeader->freqBandData.highSubband = hSbrHeader->numberOfAnalysisBands;
    }

    /* Trigger a reset before processing this slot */
    hSbrHeader->status |= SBRDEC_HDR_STAT_RESET;
  }

  return errorStatus;
}

INT sbrDecoder_Header (
        HANDLE_SBRDECODER       self,
        HANDLE_FDK_BITSTREAM    hBs,
        const INT sampleRateIn,
        const INT sampleRateOut,
        const INT samplesPerFrame,
        const AUDIO_OBJECT_TYPE coreCodec,
        const MP4_ELEMENT_ID    elementID,
        const INT               elementIndex
        )
{
  SBR_HEADER_STATUS headerStatus;
  HANDLE_SBR_HEADER_DATA hSbrHeader;
  SBR_ERROR sbrError = SBRDEC_OK;
  int headerIndex;

  if ( self == NULL || elementIndex > (8) )
  {
    return SBRDEC_UNSUPPORTED_CONFIG;
  }

  if (! sbrDecoder_isCoreCodecValid(coreCodec)) {
    return SBRDEC_UNSUPPORTED_CONFIG;
  }

  sbrError = sbrDecoder_InitElement(
          self,
          sampleRateIn,
          sampleRateOut,
          samplesPerFrame,
          coreCodec,
          elementID,
          elementIndex
          );

  if (sbrError != SBRDEC_OK) {
    goto bail;
  }

  headerIndex = getHeaderSlot(self->pSbrElement[elementIndex]->useFrameSlot,
                              self->pSbrElement[elementIndex]->useHeaderSlot);
  hSbrHeader = &(self->sbrHeader[elementIndex][headerIndex]);

  headerStatus = sbrGetHeaderData ( hSbrHeader,
                                    hBs,
                                    self->flags,
                                    0);


  {
    SBR_DECODER_ELEMENT *pSbrElement;

    pSbrElement = self->pSbrElement[elementIndex];

    /* Sanity check */
    if (pSbrElement != NULL) {
      if ( (elementID == ID_CPE && pSbrElement->nChannels != 2)
        || (elementID != ID_CPE && pSbrElement->nChannels != 1) )
      {
        return SBRDEC_UNSUPPORTED_CONFIG;
      }
      if ( headerStatus == HEADER_RESET ) {

        sbrError = sbrDecoder_HeaderUpdate(
              self,
              hSbrHeader,
              headerStatus,
              pSbrElement->pSbrChannel,
              pSbrElement->nChannels
              );

        if (sbrError == SBRDEC_OK) {
          hSbrHeader->syncState = SBR_HEADER;
          hSbrHeader->status   |= SBRDEC_HDR_STAT_UPDATE;
        }
        /* else {
          Since we already have overwritten the old SBR header the only way out is UPSAMPLING!
          This will be prepared in the next step.
        } */
      }
    }
  }
bail:
  return sbrError;
}


SBR_ERROR sbrDecoder_SetParam (HANDLE_SBRDECODER   self,
                               const SBRDEC_PARAM  param,
                               const INT           value )
{
  SBR_ERROR errorStatus = SBRDEC_OK;

  /* configure the subsystems */
  switch (param)
  {
  case SBR_SYSTEM_BITSTREAM_DELAY:
    if (value < 0 || value > (1)) {
      errorStatus = SBRDEC_SET_PARAM_FAIL;
      break;
    }
    if (self == NULL) {
      errorStatus = SBRDEC_NOT_INITIALIZED;
    } else {
      self->numDelayFrames = (UCHAR)value;
    }
    break;
  case SBR_QMF_MODE:
    if (self == NULL) {
      errorStatus = SBRDEC_NOT_INITIALIZED;
    } else {
      if (value == 1) {
        self->flags |= SBRDEC_LOW_POWER;
      } else {
        self->flags &= ~SBRDEC_LOW_POWER;
      }
    }
    break;
  case SBR_LD_QMF_TIME_ALIGN:
    if (self == NULL) {
      errorStatus = SBRDEC_NOT_INITIALIZED;
    } else {
      if (value == 1) {
        self->flags |= SBRDEC_LD_MPS_QMF;
      } else {
        self->flags &= ~SBRDEC_LD_MPS_QMF;
      }
    }
    break;
  case SBR_FLUSH_DATA:
    if (value != 0) {
      if (self == NULL) {
        errorStatus = SBRDEC_NOT_INITIALIZED;
      } else {
        self->flags |= SBRDEC_FLUSH;
      }
    }
    break;
  case SBR_CLEAR_HISTORY:
    if (value != 0) {
      if (self == NULL) {
        errorStatus = SBRDEC_NOT_INITIALIZED;
      } else {
        self->flags |= SBRDEC_FORCE_RESET;
      }
    }
    break;
  case SBR_BS_INTERRUPTION:
    {
      int elementIndex;

      if (self == NULL) {
        errorStatus = SBRDEC_NOT_INITIALIZED;
        break;
      }

      /* Loop over SBR elements */
      for (elementIndex = 0; elementIndex < self->numSbrElements; elementIndex++) {
      if (self->pSbrElement[elementIndex] != NULL)
      {
        HANDLE_SBR_HEADER_DATA hSbrHeader;
        int headerIndex = getHeaderSlot(self->pSbrElement[elementIndex]->useFrameSlot,
                                        self->pSbrElement[elementIndex]->useHeaderSlot);

        hSbrHeader = &(self->sbrHeader[elementIndex][headerIndex]);

        /* Set sync state UPSAMPLING for the corresponding slot.
           This switches off bitstream parsing until a new header arrives. */
        hSbrHeader->syncState = UPSAMPLING;
        hSbrHeader->status   |= SBRDEC_HDR_STAT_UPDATE;
      } }
    }
    break;
  default:
    errorStatus = SBRDEC_SET_PARAM_FAIL;
    break;
  }  /* switch(param) */

  return (errorStatus);
}

static
SBRDEC_DRC_CHANNEL * sbrDecoder_drcGetChannel( const HANDLE_SBRDECODER self, const INT channel )
{
  SBRDEC_DRC_CHANNEL *pSbrDrcChannelData = NULL;
  int elementIndex, elChanIdx=0, numCh=0;

  for (elementIndex = 0; (elementIndex < (8)) && (numCh <= channel); elementIndex++)
  {
    SBR_DECODER_ELEMENT *pSbrElement = self->pSbrElement[elementIndex];
    int c, elChannels;

    elChanIdx = 0;
    if (pSbrElement == NULL) break;

    /* Determine amount of channels for this element */
    switch (pSbrElement->elementID) {
      case ID_CPE: elChannels = 2;
        break;
      case ID_LFE:
      case ID_SCE: elChannels = 1;
        break;
      case ID_NONE:
      default: elChannels = 0;
        break;
    }

    /* Limit with actual allocated element channels */
    elChannels = FDKmin(elChannels, pSbrElement->nChannels);

    for (c = 0; (c < elChannels) && (numCh <= channel); c++) {
      if (pSbrElement->pSbrChannel[elChanIdx] != NULL) {
        numCh++;
        elChanIdx++;
      }
    }
  }
  elementIndex -= 1;
  elChanIdx -= 1;

  if (elChanIdx < 0 || elementIndex < 0) {
    return NULL;
  }

  if ( self->pSbrElement[elementIndex] != NULL ) {
    if ( self->pSbrElement[elementIndex]->pSbrChannel[elChanIdx] != NULL )
    {
      pSbrDrcChannelData = &self->pSbrElement[elementIndex]->pSbrChannel[elChanIdx]->SbrDec.sbrDrcChannel;
    }
  }

  return (pSbrDrcChannelData);
}

SBR_ERROR sbrDecoder_drcFeedChannel ( HANDLE_SBRDECODER  self,
                                      INT                ch,
                                      UINT               numBands,
                                      FIXP_DBL          *pNextFact_mag,
                                      INT                nextFact_exp,
                                      SHORT              drcInterpolationScheme,
                                      UCHAR              winSequence,
                                      USHORT            *pBandTop )
{
  SBRDEC_DRC_CHANNEL *pSbrDrcChannelData = NULL;
  int band, isValidData = 0;

  if (self == NULL) {
    return SBRDEC_NOT_INITIALIZED;
  }
  if (ch > (8) || pNextFact_mag == NULL) {
    return SBRDEC_SET_PARAM_FAIL;
  }

  /* Search for gain values different to 1.0f */
  for (band = 0; band < numBands; band += 1) {
    if ( !((pNextFact_mag[band] == FL2FXCONST_DBL(0.5))  && (nextFact_exp == 1))
      && !((pNextFact_mag[band] == (FIXP_DBL)MAXVAL_DBL) && (nextFact_exp == 0)) ) {
      isValidData = 1;
      break;
    }
  }

  /* Find the right SBR channel */
  pSbrDrcChannelData = sbrDecoder_drcGetChannel( self, ch );

  if ( pSbrDrcChannelData != NULL ) {
    if ( pSbrDrcChannelData->enable || isValidData )
  { /* Activate processing only with real and valid data */
    int i;

    pSbrDrcChannelData->enable   = 1;
    pSbrDrcChannelData->numBandsNext = numBands;

    pSbrDrcChannelData->winSequenceNext            = winSequence;
    pSbrDrcChannelData->drcInterpolationSchemeNext = drcInterpolationScheme;
    pSbrDrcChannelData->nextFact_exp               = nextFact_exp;

    for (i = 0; i < (int)numBands; i++) {
      pSbrDrcChannelData->bandTopNext[i]  = pBandTop[i];
      pSbrDrcChannelData->nextFact_mag[i] = pNextFact_mag[i];
    }
  }
  }

  return SBRDEC_OK;
}


void sbrDecoder_drcDisable ( HANDLE_SBRDECODER  self,
                             INT                ch )
{
  SBRDEC_DRC_CHANNEL *pSbrDrcChannelData = NULL;

  if ( (self == NULL)
    || (ch > (8))
    || (self->numSbrElements == 0)
    || (self->numSbrChannels == 0) ) {
    return;
  }

  /* Find the right SBR channel */
  pSbrDrcChannelData = sbrDecoder_drcGetChannel( self, ch );

  if ( pSbrDrcChannelData != NULL ) {
    sbrDecoder_drcInitChannel( pSbrDrcChannelData );
  }
}



SBR_ERROR sbrDecoder_Parse(
        HANDLE_SBRDECODER self,
        HANDLE_FDK_BITSTREAM  hBs,
        int *count,
        int  bsPayLen,
        int  crcFlag,
        MP4_ELEMENT_ID prevElement,
        int elementIndex,
        int fGlobalIndependencyFlag
        )
{
  SBR_DECODER_ELEMENT   *hSbrElement;
  HANDLE_SBR_HEADER_DATA hSbrHeader;
  HANDLE_SBR_CHANNEL    *pSbrChannel;

  SBR_FRAME_DATA *hFrameDataLeft;
  SBR_FRAME_DATA *hFrameDataRight;

  SBR_ERROR errorStatus = SBRDEC_OK;
  SBR_SYNC_STATE initialSyncState;
  SBR_HEADER_STATUS headerStatus = HEADER_NOT_PRESENT;

  INT  startPos;
  INT  CRCLen = 0;

  int  stereo;
  int  fDoDecodeSbrData = 1;

  int lastSlot, lastHdrSlot = 0, thisHdrSlot;

  /* Remember start position of  SBR element */
  startPos = FDKgetValidBits(hBs);

  /* SBR sanity checks */
  if ( self == NULL || self->pSbrElement[elementIndex] == NULL ) {
    errorStatus = SBRDEC_NOT_INITIALIZED;
    goto bail;
  } 

  hSbrElement = self->pSbrElement[elementIndex];

  lastSlot    = (hSbrElement->useFrameSlot > 0) ? hSbrElement->useFrameSlot-1 : self->numDelayFrames;
  lastHdrSlot =  hSbrElement->useHeaderSlot[lastSlot];
  thisHdrSlot =  getHeaderSlot( hSbrElement->useFrameSlot, hSbrElement->useHeaderSlot );  /* Get a free header slot not used by frames not processed yet. */

  /* Assign the free slot to store a new header if there is one. */
  hSbrHeader = &self->sbrHeader[elementIndex][thisHdrSlot];

  pSbrChannel = hSbrElement->pSbrChannel;
  stereo = (hSbrElement->elementID == ID_CPE) ? 1 : 0;

  hFrameDataLeft  = &self->pSbrElement[elementIndex]->pSbrChannel[0]->frameData[hSbrElement->useFrameSlot];
  hFrameDataRight = &self->pSbrElement[elementIndex]->pSbrChannel[1]->frameData[hSbrElement->useFrameSlot];

  initialSyncState = hSbrHeader->syncState;

  /* reset PS flag; will be set after PS was found */
  self->flags &= ~SBRDEC_PS_DECODED;

  if (hSbrHeader->status & SBRDEC_HDR_STAT_UPDATE) {
    /* Got a new header from extern (e.g. from an ASC) */
    headerStatus = HEADER_OK;
    hSbrHeader->status &= ~SBRDEC_HDR_STAT_UPDATE;
  }
  else if (thisHdrSlot != lastHdrSlot) {
    /* Copy the last header into this slot otherwise the
       header compare will trigger more HEADER_RESETs than needed. */
    copySbrHeader( hSbrHeader, &self->sbrHeader[elementIndex][lastHdrSlot] );
  }

  /*
     Check if bit stream data is valid and matches the element context
  */
  if ( ((prevElement != ID_SCE) && (prevElement != ID_CPE)) || prevElement != hSbrElement->elementID) {
    /* In case of LFE we also land here, since there is no LFE SBR element (do upsampling only) */
    fDoDecodeSbrData = 0;
  }

  if (fDoDecodeSbrData)
  {
    if ((INT)FDKgetValidBits(hBs) <= 0) {
      fDoDecodeSbrData = 0;
    }
  }

  /*
     SBR CRC-check
  */
  if (fDoDecodeSbrData)
  {
    if (crcFlag == 1) {
      switch (self->coreCodec) {
      case AOT_ER_AAC_ELD:
        FDKpushFor (hBs, 10);
        /* check sbrcrc later: we don't know the payload length now */
        break;
      default:
        CRCLen = bsPayLen - 10;                     /* change: 0 => i */
        if (CRCLen < 0) {
          fDoDecodeSbrData = 0;
        } else {
          fDoDecodeSbrData = SbrCrcCheck (hBs, CRCLen);
        }
        break;
      }
    }
  } /* if (fDoDecodeSbrData) */

  /*
     Read in the header data and issue a reset if change occured
  */
  if (fDoDecodeSbrData)
  {
    int sbrHeaderPresent;

    {
      sbrHeaderPresent = FDKreadBit(hBs);
    }

    if ( sbrHeaderPresent ) {
      headerStatus = sbrGetHeaderData (hSbrHeader,
                                       hBs,
                                       self->flags,
                                       1);
    }

    if (headerStatus == HEADER_RESET)
    {
      errorStatus = sbrDecoder_HeaderUpdate(
            self,
            hSbrHeader,
            headerStatus,
            pSbrChannel,
            hSbrElement->nChannels 
            );

      if (errorStatus == SBRDEC_OK) {
        hSbrHeader->syncState = SBR_HEADER;
      } else {
        hSbrHeader->syncState = SBR_NOT_INITIALIZED;
      }
    }

    if (errorStatus != SBRDEC_OK) {
      fDoDecodeSbrData = 0;
    }
  } /* if (fDoDecodeSbrData) */

  /*
    Print debugging output only if state has changed
  */

  /* read frame data */
  if ((hSbrHeader->syncState >= SBR_HEADER) && fDoDecodeSbrData) {
    int sbrFrameOk;
    /* read the SBR element data */
    if (stereo) {
      sbrFrameOk = sbrGetChannelPairElement(hSbrHeader,
                                            hFrameDataLeft,
                                            hFrameDataRight,
                                            hBs,
                                            self->flags,
                                            self->pSbrElement[elementIndex]->transposerSettings.overlap);
    }
    else {
      if (self->hParametricStereoDec != NULL) {
        /* update slot index for PS bitstream parsing */
        self->hParametricStereoDec->bsLastSlot = self->hParametricStereoDec->bsReadSlot;
        self->hParametricStereoDec->bsReadSlot = hSbrElement->useFrameSlot;
      }
      sbrFrameOk = sbrGetSingleChannelElement(hSbrHeader,
                                              hFrameDataLeft,
                                              hBs,
                                              self->hParametricStereoDec,
                                              self->flags,
                                              self->pSbrElement[elementIndex]->transposerSettings.overlap);
    }
    if (!sbrFrameOk) {
      fDoDecodeSbrData = 0;
    }
    else {
      INT valBits;

      if (bsPayLen > 0) {
        valBits = bsPayLen - ((INT)startPos - (INT)FDKgetValidBits(hBs));
      } else {
        valBits = (INT)FDKgetValidBits(hBs);
      }

      if ( crcFlag == 1 ) {
        switch (self->coreCodec) {
        case AOT_ER_AAC_ELD:
          {
            /* late crc check for eld */
            INT payloadbits = (INT)startPos - (INT)FDKgetValidBits(hBs) - startPos;
            INT crcLen      = payloadbits - 10;
            FDKpushBack(hBs, payloadbits);
            fDoDecodeSbrData      = SbrCrcCheck (hBs, crcLen);
            FDKpushFor(hBs, crcLen);
          }
          break;
        default:
          break;
        }
      }

      /* sanity check of remaining bits */
      if (valBits < 0) {
        fDoDecodeSbrData = 0;
      } else {
        switch (self->coreCodec) {
        case AOT_SBR:
        case AOT_PS:
        case AOT_AAC_LC:
          {
            /* This sanity check is only meaningful with General Audio bitstreams */
            int alignBits = valBits & 0x7;

            if (valBits > alignBits) {
              fDoDecodeSbrData = 0;
            }
          }
          break;
        default:
          /* No sanity check available */
          break;
        }
      }
    }
  } else {
    /* The returned bit count will not be the actual payload size since we did not
       parse the frame data. Return an error so that the caller can react respectively. */
    errorStatus = SBRDEC_PARSE_ERROR;
  }

  if (!fDoDecodeSbrData) {
    /* Set error flag for this slot to trigger concealment */
    self->pSbrElement[elementIndex]->frameErrorFlag[hSbrElement->useFrameSlot] = 1;
    errorStatus = SBRDEC_PARSE_ERROR;
  } else {
    /* Everything seems to be ok so clear the error flag */
    self->pSbrElement[elementIndex]->frameErrorFlag[hSbrElement->useFrameSlot] = 0;
  }

  if (!stereo) {
    /* Turn coupling off explicitely to avoid access to absent right frame data
       that might occur with corrupt bitstreams. */
    hFrameDataLeft->coupling = COUPLING_OFF;
  }

bail:
  if (errorStatus == SBRDEC_OK) {
    if (headerStatus == HEADER_NOT_PRESENT) {
      /* Use the old header for this frame */
      hSbrElement->useHeaderSlot[hSbrElement->useFrameSlot] = lastHdrSlot;
    } else {
      /* Use the new header for this frame */
      hSbrElement->useHeaderSlot[hSbrElement->useFrameSlot] = thisHdrSlot;
    }

    /* Move frame pointer to the next slot which is up to be decoded/applied next */
    hSbrElement->useFrameSlot = (hSbrElement->useFrameSlot+1) % (self->numDelayFrames+1);
  }

  *count -= startPos - FDKgetValidBits(hBs);

  return errorStatus;
}


/**
 * \brief Render one SBR element into time domain signal.
 * \param self SBR decoder handle
 * \param timeData pointer to output buffer
 * \param interleaved flag indicating interleaved channel output
 * \param channelMapping pointer to UCHAR array where next 2 channel offsets are stored. 
 * \param elementIndex enumerating index of the SBR element to render.
 * \param numInChannels number of channels from core coder (reading stride).
 * \param numOutChannels pointer to a location to return number of output channels.
 * \param psPossible flag indicating if PS is possible or not.
 * \return SBRDEC_OK if successfull, else error code
 */
static SBR_ERROR
sbrDecoder_DecodeElement (
        HANDLE_SBRDECODER    self,
        INT_PCM             *timeData,
        const int            interleaved,
        const UCHAR         *channelMapping,
        const int            elementIndex,
        const int            numInChannels,
        int                 *numOutChannels,
        const int            psPossible
        )
{
  SBR_DECODER_ELEMENT *hSbrElement = self->pSbrElement[elementIndex];
  HANDLE_SBR_CHANNEL    *pSbrChannel = self->pSbrElement[elementIndex]->pSbrChannel;
  HANDLE_SBR_HEADER_DATA hSbrHeader = &self->sbrHeader[elementIndex][hSbrElement->useHeaderSlot[hSbrElement->useFrameSlot]];
  HANDLE_PS_DEC h_ps_d = self->hParametricStereoDec;

  /* get memory for frame data from scratch */
  SBR_FRAME_DATA *hFrameDataLeft  = &hSbrElement->pSbrChannel[0]->frameData[hSbrElement->useFrameSlot];
  SBR_FRAME_DATA *hFrameDataRight = &hSbrElement->pSbrChannel[1]->frameData[hSbrElement->useFrameSlot];

  SBR_ERROR errorStatus = SBRDEC_OK;


  INT  strideIn, strideOut, offset0, offset1;
  INT  codecFrameSize = self->codecFrameSize;

  int  stereo = (hSbrElement->elementID == ID_CPE) ? 1 : 0;
  int  numElementChannels = hSbrElement->nChannels; /* Number of channels of the current SBR element */

  if (self->flags & SBRDEC_FLUSH) {
    /* Move frame pointer to the next slot which is up to be decoded/applied next */
    hSbrElement->useFrameSlot = (hSbrElement->useFrameSlot+1) % (self->numDelayFrames+1);
    /* Update header and frame data pointer because they have already been set */
    hSbrHeader = &self->sbrHeader[elementIndex][hSbrElement->useHeaderSlot[hSbrElement->useFrameSlot]];
    hFrameDataLeft  = &hSbrElement->pSbrChannel[0]->frameData[hSbrElement->useFrameSlot];
    hFrameDataRight = &hSbrElement->pSbrChannel[1]->frameData[hSbrElement->useFrameSlot];
  }

  /* Update the header error flag */
  hSbrHeader->frameErrorFlag = hSbrElement->frameErrorFlag[hSbrElement->useFrameSlot];

  /*
     Prepare filterbank for upsampling if no valid bit stream data is available.
   */
  if ( hSbrHeader->syncState == SBR_NOT_INITIALIZED )
  {
    errorStatus = initHeaderData(
            hSbrHeader,
            self->sampleRateIn,
            self->sampleRateOut,
            codecFrameSize,
            self->flags
            );

    if (errorStatus != SBRDEC_OK) {
      return errorStatus;
    }

    hSbrHeader->syncState = UPSAMPLING;

    errorStatus = sbrDecoder_HeaderUpdate(
            self,
            hSbrHeader,
            HEADER_NOT_PRESENT,
            pSbrChannel,
            hSbrElement->nChannels
            );

    if (errorStatus != SBRDEC_OK) {
      hSbrHeader->syncState = SBR_NOT_INITIALIZED;
      return errorStatus;
    }
  }

  /* reset */
  if (hSbrHeader->status & SBRDEC_HDR_STAT_RESET) {
    int ch;
    for (ch = 0 ; ch < numElementChannels; ch++) {
      SBR_ERROR errorStatusTmp = SBRDEC_OK;

      errorStatusTmp = resetSbrDec (
             &pSbrChannel[ch]->SbrDec,
              hSbrHeader,
             &pSbrChannel[ch]->prevFrameData,
              self->flags & SBRDEC_LOW_POWER,
              self->synDownsampleFac
              );

      if (errorStatusTmp != SBRDEC_OK) {
        errorStatus = errorStatusTmp;
      }
    }
    hSbrHeader->status &= ~SBRDEC_HDR_STAT_RESET;
  }

  /* decoding */
  if ( (hSbrHeader->syncState == SBR_ACTIVE)
    || ((hSbrHeader->syncState == SBR_HEADER) && (hSbrHeader->frameErrorFlag == 0)) )
  {
    errorStatus = SBRDEC_OK;

    decodeSbrData (hSbrHeader,
                   hFrameDataLeft,
                  &pSbrChannel[0]->prevFrameData,
                   (stereo) ? hFrameDataRight : NULL,
                   (stereo) ? &pSbrChannel[1]->prevFrameData : NULL);


    /* Now we have a full parameter set and can do parameter
       based concealment instead of plain upsampling. */
    hSbrHeader->syncState = SBR_ACTIVE;
  }

  /* decode PS data if available */
  if (h_ps_d != NULL && psPossible) {
    int applyPs = 1;

    /* define which frame delay line slot to process */
    h_ps_d->processSlot = hSbrElement->useFrameSlot;

    applyPs = DecodePs(h_ps_d, hSbrHeader->frameErrorFlag);
    self->flags |= (applyPs) ? SBRDEC_PS_DECODED : 0;
  }

  /* Set strides for reading and writing */
  if (interleaved) {
    strideIn = numInChannels;
    if ( psPossible )
      strideOut = (numInChannels < 2) ? 2 : numInChannels;
    else
      strideOut = numInChannels;
    offset0 = channelMapping[0];
    offset1 = channelMapping[1];
  } else {
    strideIn  = 1;
    strideOut = 1;
    offset0 = channelMapping[0]*2*codecFrameSize;
    offset1 = channelMapping[1]*2*codecFrameSize;
  }

  /* use same buffers for left and right channel and apply PS per timeslot */
  /* Process left channel */
//FDKprintf("self->codecFrameSize %d\t%d\n",self->codecFrameSize,self->sampleRateIn);
  sbr_dec (&pSbrChannel[0]->SbrDec,
            timeData + offset0,
            timeData + offset0,
           &pSbrChannel[1]->SbrDec,
            timeData + offset1,
            strideIn,
            strideOut,
            hSbrHeader,
            hFrameDataLeft,
           &pSbrChannel[0]->prevFrameData,
            (hSbrHeader->syncState == SBR_ACTIVE),
            h_ps_d,
            self->flags
          );

  if (stereo) {
    /* Process right channel */
    sbr_dec (&pSbrChannel[1]->SbrDec,
              timeData + offset1,
              timeData + offset1,
              NULL,
              NULL,
              strideIn,
              strideOut,
              hSbrHeader,
              hFrameDataRight,
             &pSbrChannel[1]->prevFrameData,
              (hSbrHeader->syncState == SBR_ACTIVE),
              NULL,
              self->flags
            );
  }

  if (h_ps_d != NULL) {
    /* save PS status for next run */
    h_ps_d->psDecodedPrv = (self->flags & SBRDEC_PS_DECODED) ? 1 : 0 ;
  }

  if ( psPossible 
    )
  {
    FDK_ASSERT(strideOut > 1);
    if ( !(self->flags & SBRDEC_PS_DECODED) ) {
      /* A decoder which is able to decode PS has to produce a stereo output even if no PS data is availble. */
      /* So copy left channel to right channel.                                                              */
      if (interleaved) {
        INT_PCM *ptr;
        INT i;
        FDK_ASSERT(strideOut == 2);

        ptr = timeData;
        for (i = codecFrameSize; i--; ) 
        {
          INT_PCM tmp; /* This temporal variable is required because some compilers can't do *ptr++ = *ptr++ correctly. */
          tmp = *ptr++; *ptr++ = tmp;
          tmp = *ptr++; *ptr++ = tmp;
        }
      } else {
        FDKmemcpy( timeData+2*codecFrameSize, timeData, 2*codecFrameSize*sizeof(INT_PCM) );
      }
    }
    *numOutChannels = 2;  /* Output minimum two channels when PS is enabled. */
  }

  return errorStatus;
}


SBR_ERROR sbrDecoder_Apply ( HANDLE_SBRDECODER   self,
                             INT_PCM            *timeData,
                             int                *numChannels,
                             int                *sampleRate,
                             const UCHAR         channelMapping[(8)],
                             const int           interleaved,
                             const int           coreDecodedOk,
                             UCHAR              *psDecoded )
{
  SBR_ERROR errorStatus = SBRDEC_OK;

  int   psPossible = 0;
  int   sbrElementNum;
  int   numCoreChannels = *numChannels;
  int   numSbrChannels  = 0;

  psPossible = *psDecoded;

  if (self->numSbrElements < 1) {
    /* exit immediately to avoid access violations */
    return SBRDEC_CREATE_ERROR;
  }

  /* Sanity check of allocated SBR elements. */
  for (sbrElementNum=0; sbrElementNum<self->numSbrElements; sbrElementNum++) {
    if (self->pSbrElement[sbrElementNum] == NULL) {
      return SBRDEC_CREATE_ERROR;
    }
  }

  if (self->numSbrElements != 1 || self->pSbrElement[0]->elementID != ID_SCE) {
    psPossible = 0;
  }


  /* In case of non-interleaved time domain data and upsampling, make room for bigger SBR output. */
  if (self->synDownsampleFac == 1 && interleaved == 0) {
    int c, outputFrameSize;

    outputFrameSize =
            self->pSbrElement[0]->pSbrChannel[0]->SbrDec.SynthesisQMF.no_channels
            * self->pSbrElement[0]->pSbrChannel[0]->SbrDec.SynthesisQMF.no_col;

    for (c=numCoreChannels-1; c>0; c--) {
      FDKmemmove(timeData + c*outputFrameSize, timeData + c*self->codecFrameSize , self->codecFrameSize*sizeof(INT_PCM));
    }
  }


  /* Make sure that even if no SBR data was found/parsed *psDecoded is returned 1 if psPossible was 0. */
  if (psPossible == 0) {
    self->flags &= ~SBRDEC_PS_DECODED;
  }

  /* Loop over SBR elements */
  for (sbrElementNum = 0; sbrElementNum<self->numSbrElements; sbrElementNum++)
  {
    int numElementChan;

    if (psPossible && self->pSbrElement[sbrElementNum]->pSbrChannel[1] == NULL) {
      errorStatus = SBRDEC_UNSUPPORTED_CONFIG;
      goto bail;
    }

    numElementChan = (self->pSbrElement[sbrElementNum]->elementID == ID_CPE) ? 2 : 1;

    /* If core signal is bad then force upsampling */
    if ( ! coreDecodedOk ) {
      self->pSbrElement[sbrElementNum]->frameErrorFlag[self->pSbrElement[sbrElementNum]->useFrameSlot] = 1;
    }

    errorStatus = sbrDecoder_DecodeElement (
                                 self,
                                 timeData,
                                 interleaved,
                                 channelMapping,
                                 sbrElementNum,
                                 numCoreChannels,
                                &numElementChan,
                                 psPossible
                               );

    if (errorStatus != SBRDEC_OK) {
      goto bail;
    }

    numSbrChannels += numElementChan;
    channelMapping += numElementChan;

    if (numSbrChannels >= numCoreChannels) {
      break;
    }
  }

  /* Update numChannels and samplerate */
  *numChannels = numSbrChannels;
  *sampleRate = self->sampleRateOut;
  *psDecoded = (self->flags & SBRDEC_PS_DECODED) ? 1 : 0;



  /* Clear reset and flush flag because everything seems to be done successfully. */
  self->flags &= ~SBRDEC_FORCE_RESET;
  self->flags &= ~SBRDEC_FLUSH;

bail:

  return errorStatus;
}


SBR_ERROR sbrDecoder_Close ( HANDLE_SBRDECODER *pSelf )
{
  HANDLE_SBRDECODER self = *pSelf;
  int i;

  if (self != NULL)
  {
    if (self->hParametricStereoDec != NULL) {
      DeletePsDec ( &self->hParametricStereoDec );
    }

    if (self->workBuffer1 != NULL) {
      FreeRam_SbrDecWorkBuffer1(&self->workBuffer1);
    }
    if (self->workBuffer2 != NULL) {
      FreeRam_SbrDecWorkBuffer2(&self->workBuffer2);
    }

    for (i = 0; i < (8); i++) {
      sbrDecoder_DestroyElement( self, i );
    }

    FreeRam_SbrDecoder(pSelf);
  }

  return SBRDEC_OK;
}


INT sbrDecoder_GetLibInfo( LIB_INFO *info )
{
  int i;

  if (info == NULL) {
    return -1;
  }

  /* search for next free tab */
  for (i = 0; i < FDK_MODULE_LAST; i++) {
    if (info[i].module_id == FDK_NONE)
      break;
  }
  if (i == FDK_MODULE_LAST)
    return -1;
  info += i;

  info->module_id = FDK_SBRDEC;
  info->version = LIB_VERSION(SBRDECODER_LIB_VL0, SBRDECODER_LIB_VL1, SBRDECODER_LIB_VL2);
  LIB_VERSION_STRING(info);
  info->build_date = (char *)SBRDECODER_LIB_BUILD_DATE;
  info->build_time = (char *)SBRDECODER_LIB_BUILD_TIME;
  info->title      = (char *)SBRDECODER_LIB_TITLE;

  /* Set flags */
  info->flags = 0
    | CAPF_SBR_HQ
    | CAPF_SBR_LP
    | CAPF_SBR_PS_MPEG
    | CAPF_SBR_CONCEALMENT
    | CAPF_SBR_DRC
      ;
  /* End of flags */

  return 0;
}