libSBRdec/src/sbrdec_drc.h

   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.
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   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.
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  25 Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
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  29 2.    COPYRIGHT LICENSE
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  56 ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
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  59 You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
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  62 4.    DISCLAIMER
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  64 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
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  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 /*****************************  MPEG-4 AAC Decoder  **************************
  85
  86    Author(s):   Christian Griebel
  87    Description: Dynamic range control (DRC) decoder tool for SBR
  88
  89 ******************************************************************************/
  90
  91 #ifndef _SBRDEC_DRC_H_
  92 #define _SBRDEC_DRC_H_
  93
  94 #include "sbrdecoder.h"
  95
  96
  97
  98 #define SBRDEC_MAX_DRC_CHANNELS  (6)
  99 #define SBRDEC_MAX_DRC_BANDS     ( 16 )
 100
 101 typedef struct
 102 {
 103   FIXP_DBL prevFact_mag[(64)];
 104   INT      prevFact_exp;
 105
 106   FIXP_DBL currFact_mag[SBRDEC_MAX_DRC_BANDS];
 107   FIXP_DBL nextFact_mag[SBRDEC_MAX_DRC_BANDS];
 108   INT      currFact_exp;
 109   INT      nextFact_exp;
 110
 111   UINT     numBandsCurr;
 112   UINT     numBandsNext;
 113   USHORT   bandTopCurr[SBRDEC_MAX_DRC_BANDS];
 114   USHORT   bandTopNext[SBRDEC_MAX_DRC_BANDS];
 115
 116   SHORT    drcInterpolationSchemeCurr;
 117   SHORT    drcInterpolationSchemeNext;
 118
 119   SHORT    enable;
 120
 121   UCHAR    winSequenceCurr;
 122   UCHAR    winSequenceNext;
 123
 124 } SBRDEC_DRC_CHANNEL;
 125
 126 typedef SBRDEC_DRC_CHANNEL * HANDLE_SBR_DRC_CHANNEL;
 127
 128
 129 void sbrDecoder_drcInitChannel (
 130     HANDLE_SBR_DRC_CHANNEL  hDrcData );
 131
 132 void sbrDecoder_drcUpdateChannel (
 133     HANDLE_SBR_DRC_CHANNEL  hDrcData );
 134
 135 void sbrDecoder_drcApplySlot (
 136     HANDLE_SBR_DRC_CHANNEL  hDrcData,
 137     FIXP_DBL *qmfRealSlot,
 138     FIXP_DBL *qmfImagSlot,
 139     int  col,
 140     int  numQmfSubSamples,
 141     int  maxShift );
 142
 143 void sbrDecoder_drcApply (
 144     HANDLE_SBR_DRC_CHANNEL  hDrcData,
 145     FIXP_DBL **QmfBufferReal,
 146     FIXP_DBL **QmfBufferImag,
 147     int  numQmfSubSamples,
 148     int *scaleFactor );
 149
 150
 151 #endif  /* _SBRDEC_DRC_H_ */