libSBRdec/src/psdec_hybrid.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.
   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
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  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:
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  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.
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  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.
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  42 The name of Fraunhofer may not be used to endorse or promote products derived from this library without
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  46 software or your modifications thereto.
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  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."
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  53 3.    NO PATENT LICENSE
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  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.
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  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
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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 #ifndef __HYBRID_H
  85 #define __HYBRID_H
  86
  87 #include "sbrdecoder.h"
  88
  89
  90 #define HYBRID_FILTER_LENGTH  13
  91 #define HYBRID_FILTER_DELAY    6
  92
  93
  94 #define FAST_FILTER2
  95 #define FAST_FILTER4
  96 #define FAST_FILTER8
  97 #define FAST_FILTER12
  98
  99 #define FFT_IDX_R(a)  (2*a)
 100 #define FFT_IDX_I(a)  (2*a+1)
 101
 102 #define FIXP_FFT_IDX_R(a)   (a<<1)
 103 #define FIXP_FFT_IDX_I(a)  ((a<<1) + 1)
 104
 105
 106 typedef enum {
 107
 108   HYBRID_2_REAL     = 2,
 109   HYBRID_4_CPLX     = 4,
 110   HYBRID_8_CPLX     = 8,
 111   HYBRID_12_CPLX    = 12
 112
 113 } HYBRID_RES;
 114
 115 typedef struct
 116 {
 117   SCHAR   nQmfBands;
 118   SCHAR   frameSize;
 119   SCHAR   qmfBufferMove;
 120
 121   UCHAR   pResolution[3];
 122
 123   FIXP_DBL mQmfBufferRealSlot[3][HYBRID_FILTER_LENGTH];   /**< Stores old Qmf samples. */
 124   FIXP_DBL mQmfBufferImagSlot[3][HYBRID_FILTER_LENGTH];
 125   SCHAR sf_mQmfBuffer;
 126
 127 } HYBRID;
 128
 129 typedef HYBRID *HANDLE_HYBRID;
 130
 131 void
 132 fillHybridDelayLine( FIXP_DBL **fixpQmfReal,
 133                      FIXP_DBL **fixpQmfImag,
 134                      FIXP_DBL   fixpHybridLeftR[12],
 135                      FIXP_DBL   fixpHybridLeftI[12],
 136                      FIXP_DBL   fixpHybridRightR[12],
 137                      FIXP_DBL   fixpHybridRightI[12],
 138                      HANDLE_HYBRID hHybrid );
 139
 140 void
 141 slotBasedHybridAnalysis ( FIXP_DBL *fixpQmfReal,
 142                           FIXP_DBL *fixpQmfImag,
 143
 144                           FIXP_DBL  *fixpHybridReal,
 145                           FIXP_DBL  *fixpHybridImag,
 146
 147                           HANDLE_HYBRID hHybrid);
 148
 149
 150 void
 151 slotBasedHybridSynthesis ( FIXP_DBL  *fixpHybridReal,
 152                            FIXP_DBL  *fixpHybridImag,
 153
 154                            FIXP_DBL  *fixpQmfReal,
 155                            FIXP_DBL  *fixpQmfImag,
 156
 157                            HANDLE_HYBRID hHybrid );
 158
 159 SBR_ERROR InitHybridFilterBank ( HANDLE_HYBRID  hHybrid,
 160                                  SCHAR frameSize,
 161                                  SCHAR noBands,
 162                                  const UCHAR *pResolution );
 163
 164
 165 #endif /* __HYBRID_H */