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1 /* -----------------------------------------------------------------------------
2 Software License for The Fraunhofer FDK AAC Codec Library for Android
3 
4 © Copyright  1995 - 2019 Fraunhofer-Gesellschaft zur Förderung der angewandten
5 Forschung e.V. All rights reserved.
6 
7  1.    INTRODUCTION
8 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
9 that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
10 scheme for digital audio. This FDK AAC Codec software is intended to be used on
11 a wide variety of Android devices.
12 
13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
14 general perceptual audio codecs. AAC-ELD is considered the best-performing
15 full-bandwidth communications codec by independent studies and is widely
16 deployed. AAC has been standardized by ISO and IEC as part of the MPEG
17 specifications.
18 
19 Patent licenses for necessary patent claims for the FDK AAC Codec (including
20 those of Fraunhofer) may be obtained through Via Licensing
21 (www.vialicensing.com) or through the respective patent owners individually for
22 the purpose of encoding or decoding bit streams in products that are compliant
23 with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
24 Android devices already license these patent claims through Via Licensing or
25 directly from the patent owners, and therefore FDK AAC Codec software may
26 already be covered under those patent licenses when it is used for those
27 licensed purposes only.
28 
29 Commercially-licensed AAC software libraries, including floating-point versions
30 with enhanced sound quality, are also available from Fraunhofer. Users are
31 encouraged to check the Fraunhofer website for additional applications
32 information and documentation.
33 
34 2.    COPYRIGHT LICENSE
35 
36 Redistribution and use in source and binary forms, with or without modification,
37 are permitted without payment of copyright license fees provided that you
38 satisfy the following conditions:
39 
40 You must retain the complete text of this software license in redistributions of
41 the FDK AAC Codec or your modifications thereto in source code form.
42 
43 You must retain the complete text of this software license in the documentation
44 and/or other materials provided with redistributions of the FDK AAC Codec or
45 your modifications thereto in binary form. You must make available free of
46 charge copies of the complete source code of the FDK AAC Codec and your
47 modifications thereto to recipients of copies in binary form.
48 
49 The name of Fraunhofer may not be used to endorse or promote products derived
50 from this library without prior written permission.
51 
52 You may not charge copyright license fees for anyone to use, copy or distribute
53 the FDK AAC Codec software or your modifications thereto.
54 
55 Your modified versions of the FDK AAC Codec must carry prominent notices stating
56 that you changed the software and the date of any change. For modified versions
57 of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
58 must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
59 AAC Codec Library for Android."
60 
61 3.    NO PATENT LICENSE
62 
63 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
64 limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
65 Fraunhofer provides no warranty of patent non-infringement with respect to this
66 software.
67 
68 You may use this FDK AAC Codec software or modifications thereto only for
69 purposes that are authorized by appropriate patent licenses.
70 
71 4.    DISCLAIMER
72 
73 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
74 holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
75 including but not limited to the implied warranties of merchantability and
76 fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
77 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
78 or consequential damages, including but not limited to procurement of substitute
79 goods or services; loss of use, data, or profits, or business interruption,
80 however caused and on any theory of liability, whether in contract, strict
81 liability, or tort (including negligence), arising in any way out of the use of
82 this software, even if advised of the possibility of such damage.
83 
84 5.    CONTACT INFORMATION
85 
86 Fraunhofer Institute for Integrated Circuits IIS
87 Attention: Audio and Multimedia Departments - FDK AAC LL
88 Am Wolfsmantel 33
89 91058 Erlangen, Germany
90 
91 www.iis.fraunhofer.de/amm
92 amm-info@iis.fraunhofer.de
93 ----------------------------------------------------------------------------- */
94 
95 /*********************** MPEG surround decoder library *************************
96 
97    Author(s):
98 
99    Description: SAC Decoder Library structures
100 
101 *******************************************************************************/
102 
103 #ifndef SAC_DEC_H
104 #define SAC_DEC_H
105 
106 #include "common_fix.h"
107 
108 #include "sac_dec_interface.h" /* library interface in ../include */
109 
110 #include "FDK_qmf_domain.h"
111 #include "sac_qmf.h"
112 #include "FDK_bitstream.h" /* mp4 bitbuffer */
113 #include "sac_calcM1andM2.h"
114 #include "FDK_hybrid.h"
115 #include "FDK_decorrelate.h"
116 #include "sac_reshapeBBEnv.h"
117 
118 #include "sac_dec_conceal.h"
119 
120 #include "sac_tsd.h"
121 
122 #ifndef MAX
123 #define MAX(a, b) ((a) > (b) ? (a) : (b))
124 #endif
125 
126 #define ICCdefault 0
127 #define IPDdefault 0
128 #define arbdmxGainDefault 0
129 #define CPCdefault 10
130 #define tttCLD1default 15
131 #define tttCLD2default 0
132 
133 #define IS_HQ_ONLY(aot)                                                      \
134   ((aot) == AOT_ER_AAC_LD || (aot) == AOT_ER_AAC_ELD || (aot) == AOT_USAC || \
135    (aot) == AOT_RSVD50)
136 
137 #define SCONST(x) FL2FXCONST_DBL(x)
138 
139 #define PC_NUM_BANDS (8)
140 #define PC_NUM_HYB_BANDS (PC_NUM_BANDS - 3 + 10)
141 #define ABS_THR (1e-9f * 32768 * 32768)
142 
143 #define MAX_HYBRID_BANDS (MAX_NUM_QMF_BANDS - 3 + 10)
144 #define HYBRID_FILTER_DELAY (6)
145 
146 #define MAX_RESIDUAL_FRAMES (4)
147 #define MAX_RESIDUAL_BISTREAM \
148   (836) /*  48000 bps * 3 res / (8 * 44100 / 2048 ) */
149 #define MAX_MDCT_COEFFS (1024)
150 #define SACDEC_RESIDUAL_BS_BUF_SIZE \
151   (1024) /* used to setup and check residual bitstream buffer */
152 
153 #define MAX_NUM_PARAMS (MAX_NUM_OTT + 4 * MAX_NUM_TTT + MAX_INPUT_CHANNELS)
154 #define MAX_NUM_PARAMETERS (MAX(MAX_NUM_PARAMS, MAX_NUM_OTT))
155 
156 #define MAX_PARAMETER_SETS (9)
157 
158 #define MAX_M2_INPUT (MAX_OUTPUT_CHANNELS) /* 3 direct + 5 diffuse */
159 
160 #define MAX_QMF_BANDS_TO_HYBRID \
161   (3) /* 3 bands are filtered again in "40 bands" case */
162 #define PROTO_LEN (13)
163 #define BUFFER_LEN_LF (PROTO_LEN)
164 #define BUFFER_LEN_HF ((PROTO_LEN - 1) / 2)
165 
166 #define MAX_NO_DECORR_CHANNELS (MAX_OUTPUT_CHANNELS)
167 #define HRTF_AZIMUTHS (5)
168 
169 #define MAX_NUM_OTT_AT 0
170 
171 /* left out */
172 
173 typedef enum {
174   UPMIXTYPE_BYPASS = -1, /*just bypass the input channels without processing*/
175   UPMIXTYPE_NORMAL = 0   /*multichannel loudspeaker upmix with spatial data*/
176 } UPMIXTYPE;
177 
isTwoChMode(UPMIXTYPE upmixType)178 static inline int isTwoChMode(UPMIXTYPE upmixType) {
179   int retval = 0;
180   return retval;
181 }
182 
183   /* left out end */
184 
185 #define MPEGS_BYPASSMODE (0x00000001)
186 #define MPEGS_CONCEAL (0x00000002)
187 
188 typedef struct STP_DEC *HANDLE_STP_DEC;
189 
190 typedef struct {
191   SCHAR bsQuantCoarseXXXprev;
192   SCHAR bsQuantCoarseXXXprevParse;
193 } LOSSLESSSTATE;
194 
195 typedef struct {
196   SCHAR bsXXXDataMode[MAX_PARAMETER_SETS];
197   SCHAR bsQuantCoarseXXX[MAX_PARAMETER_SETS];
198   SCHAR bsFreqResStrideXXX[MAX_PARAMETER_SETS];
199   SCHAR nocmpQuantCoarseXXX[MAX_PARAMETER_SETS];
200   LOSSLESSSTATE *state; /* Link to persistent state information */
201 } LOSSLESSDATA;
202 
203 struct SPATIAL_BS_FRAME_struct {
204   UCHAR bsIndependencyFlag;
205   UCHAR newBsData;
206   UCHAR numParameterSets;
207 
208   /*
209   If bsFramingType == 0, then the paramSlot[ps] for 0 <= ps < numParamSets is
210   calculated as follows: paramSlot[ps] = ceil(numSlots*(ps+1)/numParamSets) - 1
211   Otherwise, it is
212     paramSlot[ps] = bsParamSlot[ps]
213   */
214   INT paramSlot[MAX_PARAMETER_SETS];
215 
216   /* These arrays contain the compact indices, only one value per pbstride, only
217    * paramsets actually containing data. */
218   /* These values are written from the parser in ecDataDec() and read during
219    * decode in mapIndexData() */
220   SCHAR cmpOttCLDidx[MAX_NUM_OTT + MAX_NUM_OTT_AT][MAX_PARAMETER_SETS]
221                     [MAX_PARAMETER_BANDS];
222   SCHAR cmpOttICCidx[MAX_NUM_OTT][MAX_PARAMETER_SETS][MAX_PARAMETER_BANDS];
223 
224   /* Smoothing */
225   UCHAR bsSmoothMode[MAX_PARAMETER_SETS];
226   UCHAR bsSmoothTime[MAX_PARAMETER_SETS];
227   UCHAR bsFreqResStrideSmg[MAX_PARAMETER_SETS];
228   UCHAR bsSmgData[MAX_PARAMETER_SETS]
229                  [MAX_PARAMETER_BANDS]; /* smoothing flags, one if band is
230                                            smoothed, otherwise zero */
231 
232   /* Arbitrary Downmix */
233   SCHAR (*cmpArbdmxGainIdx)[MAX_PARAMETER_SETS][MAX_PARAMETER_BANDS];
234 
235   /* Lossless control */
236   LOSSLESSDATA *CLDLosslessData;
237   LOSSLESSDATA *ICCLosslessData;
238   /* LOSSLESSDATA *ADGLosslessData; -> is stored in CLDLosslessData[offset] */
239 
240   LOSSLESSDATA *IPDLosslessData;
241   SCHAR (*cmpOttIPDidx)[MAX_PARAMETER_SETS][MAX_PARAMETER_BANDS];
242   int phaseMode;
243   int OpdSmoothingMode;
244 
245   UCHAR tempShapeEnableChannelGES[MAX_OUTPUT_CHANNELS]; /*!< GES side info. */
246   UCHAR bsEnvShapeData[MAX_OUTPUT_CHANNELS]
247                       [MAX_TIME_SLOTS]; /*!< GES side info (quantized). */
248 
249   UCHAR tempShapeEnableChannelSTP[MAX_OUTPUT_CHANNELS]; /*!< STP side info. */
250 
251   TSD_DATA TsdData[1]; /*!< TSD data structure. */
252 };
253 
254 typedef struct {
255   /* Lossless state */
256   LOSSLESSSTATE CLDLosslessState[MAX_NUM_PARAMETERS];
257   LOSSLESSSTATE ICCLosslessState[MAX_NUM_PARAMETERS];
258   LOSSLESSSTATE IPDLosslessState[MAX_NUM_PARAMETERS];
259 } BS_LL_STATE;
260 
261 typedef struct {
262   int prevParamSlot;
263   int prevSmgTime;
264   UCHAR prevSmgData[MAX_PARAMETER_BANDS];
265 
266   FIXP_DBL opdLeftState__FDK[MAX_PARAMETER_BANDS];
267   FIXP_DBL opdRightState__FDK[MAX_PARAMETER_BANDS];
268 
269 } SMOOTHING_STATE;
270 
271 typedef struct {
272   FIXP_DBL alpha__FDK;
273   FIXP_DBL beta__FDK;
274   FIXP_DBL partNrgPrev__FDK[2 * MAX_OUTPUT_CHANNELS + MAX_INPUT_CHANNELS]
275                            [BB_ENV_SIZE];
276   FIXP_DBL normNrgPrev__FDK[2 * MAX_OUTPUT_CHANNELS + MAX_INPUT_CHANNELS];
277   FIXP_DBL frameNrgPrev__FDK[2 * MAX_OUTPUT_CHANNELS + MAX_INPUT_CHANNELS];
278   INT partNrgPrevSF[2 * MAX_OUTPUT_CHANNELS + MAX_INPUT_CHANNELS];
279   INT partNrgPrev2SF[2 * MAX_OUTPUT_CHANNELS + MAX_INPUT_CHANNELS];
280   INT normNrgPrevSF[2 * MAX_OUTPUT_CHANNELS + MAX_INPUT_CHANNELS];
281   INT frameNrgPrevSF[2 * MAX_OUTPUT_CHANNELS + MAX_INPUT_CHANNELS];
282 } RESHAPE_BBENV_STATE;
283 
284 typedef struct {
285   int maxNumInputChannels;
286   int maxNumOutputChannels;
287   int maxNumQmfBands;
288   int maxNumHybridBands;
289   int maxNumXChannels;
290   int maxNumVChannels;
291   int maxNumDecorChannels;
292   int maxNumCmplxQmfBands;
293   int maxNumCmplxHybBands;
294   int maxNumResChannels;
295   int bProcResidual; /* process residual */
296   int maxNumResidualChannels;
297   int maxNumOttBoxes;
298   int maxNumParams;
299 
300 } SACDEC_CREATION_PARAMS;
301 
302 struct spatialDec_struct {
303   SACDEC_ERROR
304   errInt;             /* Field to store internal errors.
305                          Will be clear at the very beginning of each process call. */
306   int staticDecScale; /* static scale of decoder */
307 
308   /* GENERAL */
309   int samplingFreq;       /* [Hz] */
310   CFG_LEVEL decoderLevel; /* 0..5 */
311   CFG_EXTENT decoderMode;
312   CFG_BINAURAL binauralMode;
313 
314   SACDEC_CREATION_PARAMS createParams;
315 
316   int numComplexProcessingBands;
317 
318   int treeConfig; /* TREE_5151 = 5151, TREE_5152 = 5152, TREE_525 = 525, defined
319                      in sac_bitdec.h */
320 
321   int numInputChannels;  /* 1 (M) or 2 (L,R) */
322   int numOutputChannels; /* 6 for 3/2.1 (FL,FR,FC,LF,BL,BR) */
323   int numOttBoxes;       /* number of ott boxes */
324   int numM2rows;
325 
326   int numOutputChannelsAT; /* Number of output channels after arbitrary tree
327                               processing */
328 
329   int quantMode; /* QUANT_FINE, QUANT_EBQ1, QUANT_EBQ2, defined in sac_bitdec.h
330                   */
331   int arbitraryDownmix; /* (arbitraryDownmix != 0) 1 arbitrary downmix data
332                            present, 2 arbitrary downmix residual data present*/
333   int residualCoding;   /* (residualCoding != 0) => residual coding data present
334                          */
335   UCHAR nrResidualFrame;
336   UCHAR nrArbDownmixResidualFrame;
337   FDK_BITSTREAM **hResidualBitstreams;
338   int tempShapeConfig; /* */
339   int decorrType;      /* Indicates to use PS or none PS decorrelator. */
340   int decorrConfig;    /* chosen decorrelator */
341   int envQuantMode;    /* quantization mode of envelope reshaping data */
342 
343   FIXP_DBL clipProtectGain__FDK; /* global gain for upmix */
344   char clipProtectGainSF__FDK;   /* global gain for upmix */
345 
346   /* Currently ignoring center decorr
347      numVChannels = numDirektSignals + numDecorSignals */
348   int numDirektSignals;  /* needed for W, Number of direkt signals 515 -> 1 525
349                             -> 3 */
350   int wStartResidualIdx; /* Where to start read residuals for W, = 0 for 515, =
351                             1 for 525 since one residual is used in V */
352   int numDecorSignals;   /* needed for W, Number of residual and decorrelated
353                             signals, = 2, 3 for center deccorelation*/
354   int numVChannels;      /* direct signals + decorelator signals */
355   int numXChannels;      /* direct input signals + TTT-residuals */
356 
357   int timeSlots;    /* length of spatial frame in QMF samples */
358   int curTimeSlot;  /* pointer to the current time slot used for hyperframing */
359   int prevTimeSlot; /*  */
360   int curPs;
361   int frameLength; /* number of output waveform samples/channel/frame */
362   UPMIXTYPE upmixType;
363   int partiallyComplex;
364   int useFDreverb;
365 
366   int bShareDelayWithSBR;
367 
368   int tp_hybBandBorder; /* Hybrid band indicating the HP filter cut-off. */
369 
370   /* FREQUENCY MAPPING */
371   int qmfBands;
372   int hybridBands;
373   const SCHAR *kernels; /* Mapping hybrid band to parameter band. */
374 
375   int TsdTs; /**< TSD QMF slot counter 0<= ts < numSlots */
376 
377   int *param2hyb; /* Mapping parameter bands to hybrid bands */
378   int kernels_width[MAX_PARAMETER_BANDS]; /* Mapping parmeter band to hybrid
379                                              band offsets. */
380 
381   /* Residual coding */
382   int residualSamplingFreq;
383   UCHAR residualPresent[MAX_NUM_OTT + MAX_NUM_TTT];
384   UCHAR residualBands[MAX_NUM_OTT + MAX_NUM_TTT];    /* 0, if no residual data
385                                                         present for this box */
386   UCHAR residualQMFBands[MAX_NUM_OTT + MAX_NUM_TTT]; /* needed for optimized
387                                                         mdct2qmf calculation */
388   SPATIAL_SPECIFIC_CONFIG *pConfigCurrent;
389 
390   int arbdmxFramesPerSpatialFrame;
391   int arbdmxUpdQMF;
392 
393   int numParameterBands; /* Number of parameter bands 40, 28, 20, 14, 10, ...
394                             .*/
395   int bitstreamParameterBands;
396   int *numOttBands; /* number of bands for each ott, is != numParameterBands for
397                        LFEs */
398 
399   /* 1 MAPPING */
400   UCHAR extendFrame;
401   UCHAR numParameterSetsPrev;
402 
403   int *smgTime;
404   UCHAR **smgData;
405 
406   /* PARAMETER DATA decoded and dequantized */
407 
408   /* Last parameters from prev frame required during decode in mapIndexData()
409    * and not touched during parse */
410   SCHAR **ottCLDidxPrev;
411   SCHAR **ottICCidxPrev;
412   SCHAR **arbdmxGainIdxPrev;
413   SCHAR **ottIPDidxPrev;
414   SCHAR ***outIdxData; /* is this really persistent memory ? */
415 
416   /* State mem required during parse in SpatialDecParseFrameData() */
417   SCHAR **cmpOttCLDidxPrev;
418   SCHAR **cmpOttICCidxPrev;
419   SCHAR ***ottICCdiffidx;
420   SCHAR **cmpOttIPDidxPrev;
421 
422   /* State mem required in parseArbitraryDownmixData */
423   SCHAR **cmpArbdmxGainIdxPrev;
424 
425   SCHAR ***ottCLD__FDK;
426   SCHAR ***ottICC__FDK;
427 
428   SCHAR ***arbdmxGain__FDK; /* Holds the artistic downmix correction index.*/
429 
430   FIXP_DBL *arbdmxAlpha__FDK;
431   FIXP_DBL *arbdmxAlphaPrev__FDK;
432 
433   UCHAR stereoConfigIndex;
434   int highRateMode;
435 
436   int phaseCoding;
437 
438   SCHAR ***ottIPD__FDK;
439 
440   FIXP_DBL PhaseLeft__FDK[MAX_PARAMETER_BANDS];
441   FIXP_DBL PhaseRight__FDK[MAX_PARAMETER_BANDS];
442   FIXP_DBL PhasePrevLeft__FDK[MAX_PARAMETER_BANDS];
443   FIXP_DBL PhasePrevRight__FDK[MAX_PARAMETER_BANDS];
444   int numOttBandsIPD;
445 
446   /* GAIN MATRICIES FOR CURRENT and PREVIOUS PARMATER SET(s)*/
447   FIXP_DBL ***M2Real__FDK;
448   FIXP_DBL ***M2Imag__FDK;
449   FIXP_DBL ***M2RealPrev__FDK;
450   FIXP_DBL ***M2ImagPrev__FDK;
451 
452   /* INPUT SIGNALS */
453   FIXP_DBL ***qmfInputRealDelayBuffer__FDK;
454   FIXP_DBL ***qmfInputImagDelayBuffer__FDK;
455 
456   int pc_filterdelay; /* additional delay to align HQ with LP before hybird
457                          analysis */
458   int qmfInputDelayBufPos;
459   FIXP_DBL **qmfInputReal__FDK;
460   FIXP_DBL **qmfInputImag__FDK;
461 
462   FIXP_DBL **hybInputReal__FDK;
463   FIXP_DBL **hybInputImag__FDK;
464 
465   FIXP_DBL **binInputReverb;
466 
467   FIXP_DBL binGain, reverbGain;
468   FIXP_DBL binCenterGain, reverbCenterGain;
469 
470   /* RESIDUAL SIGNALS */
471 
472   FIXP_DBL ***qmfResidualReal__FDK;
473   FIXP_DBL ***qmfResidualImag__FDK;
474 
475   FIXP_DBL **hybResidualReal__FDK;
476   FIXP_DBL **hybResidualImag__FDK;
477 
478   int qmfOutputRealDryDelayBufPos;
479   FIXP_DBL ***qmfOutputRealDryDelayBuffer__FDK;
480   FIXP_DBL ***qmfOutputImagDryFilterBuffer__FDK;
481   FIXP_DBL *qmfOutputImagDryFilterBufferBase__FDK;
482 
483   /* TEMPORARY SIGNALS */
484 
485   FIXP_DBL **wReal__FDK;
486   FIXP_DBL **wImag__FDK;
487 
488   /* OUTPUT SIGNALS */
489   FIXP_DBL **hybOutputRealDry__FDK;
490   FIXP_DBL **hybOutputImagDry__FDK;
491   FIXP_DBL **hybOutputRealWet__FDK;
492   FIXP_DBL **hybOutputImagWet__FDK;
493   PCM_MPS *timeOut__FDK;
494 
495   HANDLE_FDK_QMF_DOMAIN pQmfDomain;
496 
497   FDK_ANA_HYB_FILTER
498   *hybridAnalysis; /*!< pointer Analysis hybrid filterbank array. */
499   FDK_SYN_HYB_FILTER
500   *hybridSynthesis; /*!< pointer Synthesis hybrid filterbank array. */
501   FIXP_DBL **
502       pHybridAnaStatesLFdmx; /*!< pointer to analysis hybrid filter states LF */
503   FIXP_DBL **
504       pHybridAnaStatesHFdmx; /*!< pointer to analysis hybrid filter states HF */
505   FIXP_DBL **
506       pHybridAnaStatesLFres; /*!< pointer to analysis hybrid filter states LF */
507   FIXP_DBL **
508       pHybridAnaStatesHFres; /*!< pointer to analysis hybrid filter states HF */
509 
510   DECORR_DEC *apDecor; /*!< pointer decorrelator array. */
511   FIXP_DBL **pDecorBufferCplx;
512 
513   SMOOTHING_STATE *smoothState; /*!< Pointer to smoothing states. */
514 
515   RESHAPE_BBENV_STATE *reshapeBBEnvState; /*!< GES handle. */
516   SCHAR row2channelDmxGES[MAX_OUTPUT_CHANNELS];
517 
518   HANDLE_STP_DEC hStpDec; /*!< STP handle. */
519 
520   const UCHAR *pActivM2ParamBands;
521 
522   int bOverwriteM1M2prev; /* Overwrite previous M2/M2 params with first set of
523                              new frame after SSC change (aka
524                              decodeAfterConfigHasChangedFlag). */
525   SpatialDecConcealmentInfo concealInfo;
526 
527   INT sacInDataHeadroom; /* Headroom of the SAC input time signal to prevent
528                             clipping */
529 };
530 
531 #define SACDEC_SYNTAX_MPS 1
532 #define SACDEC_SYNTAX_USAC 2
533 #define SACDEC_SYNTAX_RSVD50 4
534 #define SACDEC_SYNTAX_L2 8
535 #define SACDEC_SYNTAX_L3 16
536 #define SACDEC_SYNTAX_LD 32
537 
GetProcBand(spatialDec_struct * self,int qs)538 static inline int GetProcBand(spatialDec_struct *self, int qs) {
539   return self->kernels[qs];
540 }
541 
542 #endif /* SAC_DEC_H */
543