libSBRdec/src/sbr_dec.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.
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  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
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  29 2.    COPYRIGHT LICENSE
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  31 Redistribution and use in source and binary forms, with or without modification, are permitted without
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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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  38 provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
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  40 modifications thereto to recipients of copies in binary form.
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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
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  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.
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  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
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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 /*!
  85   \file
  86   \brief  Sbr decoder
  87 */
  88 #ifndef __SBR_DEC_H
  89 #define __SBR_DEC_H
  90
  91 #include "sbrdecoder.h"
  92
  93 #include "lpp_tran.h"
  94 #include "qmf.h"
  95 #include "env_calc.h"
  96 #include "FDK_audio.h"
  97
  98
  99 #include "sbrdec_drc.h"
 100
 101 #define SACDEC_ALIGNMENT_FIX
 102
 103 typedef struct
 104 {
 105   QMF_FILTER_BANK     AnalysiscQMF;
 106   QMF_FILTER_BANK     SynthesisQMF;
 107
 108   SBR_CALCULATE_ENVELOPE  SbrCalculateEnvelope;
 109   SBR_LPP_TRANS           LppTrans;
 110
 111   QMF_SCALE_FACTOR sbrScaleFactor;
 112   QMF_SCALE_FACTOR sbrScaleFactorRight;
 113
 114   /*! Delayed spectral data needed for the dynamic framing of SBR. Not required in case of CLDFB */
 115   FIXP_DBL * pSbrOverlapBuffer;
 116
 117   /* References to workbuffers */
 118   FIXP_DBL * WorkBuffer1;
 119   FIXP_DBL * WorkBuffer2;
 120
 121   /* QMF filter states */
 122   FIXP_QAS   anaQmfStates[(320)];
 123   FIXP_QSS * pSynQmfStates;
 124
 125   /* Reference pointer arrays for QMF time slots,
 126      mixed among overlap and current slots. */
 127   FIXP_DBL * QmfBufferReal[(((1024)/(32))+(6))];
 128   FIXP_DBL * QmfBufferImag[(((1024)/(32))+(6))];
 129   int useLP;
 130
 131   /* QMF domain extension time slot reference pointer array */
 132
 133   SBRDEC_DRC_CHANNEL  sbrDrcChannel;
 134
 135 } SBR_DEC;
 136
 137 typedef SBR_DEC *HANDLE_SBR_DEC;
 138
 139
 140 typedef struct
 141 {
 142   SBR_FRAME_DATA      frameData[(1)+1];
 143   SBR_PREV_FRAME_DATA prevFrameData;
 144   SBR_DEC SbrDec;
 145 }
 146 SBR_CHANNEL;
 147
 148 typedef SBR_CHANNEL *HANDLE_SBR_CHANNEL;
 149
 150 void
 151 SbrDecodeAndProcess (HANDLE_SBR_DEC hSbrDec,
 152                      INT_PCM *timeIn,
 153                      HANDLE_SBR_HEADER_DATA hHeaderData,
 154                      HANDLE_SBR_FRAME_DATA hFrameData,
 155                      HANDLE_SBR_PREV_FRAME_DATA hPrevFrameData,
 156                      int applyProcessing,
 157                      int channelNr
 158                      , UCHAR useLP
 159                      );
 160
 161
 162 void
 163 SbrConstructTimeOutput (HANDLE_SBR_DEC hSbrDec,            /*!< handle to Decoder channel */
 164                         INT_PCM *timeOut,                    /*!< pointer to output time signal */
 165                         HANDLE_SBR_HEADER_DATA hHeaderData,/*!< Static control data */
 166                         HANDLE_SBR_PREV_FRAME_DATA hPrevFrameData,  /*!< Some control data of last frame */
 167                         int channelNr
 168                        ,UCHAR useLP
 169                         );
 170
 171
 172 void
 173 sbr_dec (HANDLE_SBR_DEC hSbrDec,            /*!< handle to Decoder channel */
 174          INT_PCM *timeIn,                   /*!< pointer to input time signal */
 175          INT_PCM *timeOut,                  /*!< pointer to output time signal */
 176          HANDLE_SBR_DEC hSbrDecRight,       /*!< handle to Decoder channel right */
 177          INT_PCM *timeOutRight,             /*!< pointer to output time signal */
 178          const int strideIn,                /*!< Time data traversal strideIn */
 179          const int strideOut,               /*!< Time data traversal strideOut */
 180          HANDLE_SBR_HEADER_DATA hHeaderData,/*!< Static control data */
 181          HANDLE_SBR_FRAME_DATA hFrameData,  /*!< Control data of current frame */
 182          HANDLE_SBR_PREV_FRAME_DATA hPrevFrameData,  /*!< Some control data of last frame */
 183          const int applyProcessing,         /*!< Flag for SBR operation */
 184          HANDLE_PS_DEC h_ps_d,
 185          const UINT flags
 186         );
 187
 188
 189
 190 SBR_ERROR
 191 createSbrDec (SBR_CHANNEL * hSbrChannel,
 192               HANDLE_SBR_HEADER_DATA hHeaderData,
 193               TRANSPOSER_SETTINGS *pSettings,
 194               const int downsampleFac,
 195               const UINT qmfFlags,
 196               const UINT flags,
 197               const int overlap,
 198               int chan);
 199
 200 int
 201 deleteSbrDec (SBR_CHANNEL * hSbrChannel);
 202
 203 SBR_ERROR
 204 resetSbrDec (HANDLE_SBR_DEC hSbrDec,
 205              HANDLE_SBR_HEADER_DATA hHeaderData,
 206              HANDLE_SBR_PREV_FRAME_DATA hPrevFrameData,
 207              const int useLP,
 208              const int downsampleFac);
 209
 210 #endif