text: 
  /* -----------------------------------------------------------------------------------------------------------
  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
  ----------------------------------------------------------------------------------------------------------- */
  
  /***************************  Fraunhofer IIS FDK Tools  **********************
  
     Author(s): Markus Lohwasser
     Description: FDK Tools Hybrid Filterbank
  
  ******************************************************************************/
  
  #ifndef __FDK_HYBRID_H
  #define __FDK_HYBRID_H
  
  
  
  #include "../../libFDK/include/common_fix.h"
  
  /*--------------- enums -------------------------------*/
  
  /**
   * Hybrid Filterband modes.
   */
  typedef enum {
      THREE_TO_TEN,
      THREE_TO_TWELVE,
      THREE_TO_SIXTEEN
  
  } FDK_HYBRID_MODE;
  
  
  /*--------------- structure definitions ---------------*/
  typedef struct FDK_HYBRID_SETUP *HANDLE_FDK_HYBRID_SETUP;
  
  typedef struct
  {
    FIXP_DBL             *bufferLFReal[3];     /*!< LF real filter states. */
    FIXP_DBL             *bufferLFImag[3];     /*!< LF imag filter states. */
    FIXP_DBL             *bufferHFReal[13];    /*!< HF real delay lines. */
    FIXP_DBL             *bufferHFImag[13];    /*!< HF imag delay lines. */
  
    INT                   bufferLFpos;         /*!< Position to write incoming data into ringbuffer. */
    INT                   bufferHFpos;         /*!< Delay line positioning. */
    INT                   nrBands;             /*!< Number of QMF bands. */
    INT                   cplxBands;           /*!< Number of complex QMF bands.*/
    UCHAR                 hfMode;              /*!< Flag signalizes treatment of HF bands. */
  
    FIXP_DBL             *pLFmemory;           /*!< Pointer to LF states buffer. */
    FIXP_DBL             *pHFmemory;           /*!< Pointer to HF states buffer. */
  
    UINT                  LFmemorySize;        /*!< Size of LF states buffer. */
    UINT                  HFmemorySize;        /*!< Size of HF states buffer. */
  
    HANDLE_FDK_HYBRID_SETUP pSetup;            /*!< Pointer to filter setup. */
  
  } FDK_ANA_HYB_FILTER;
  
  
  typedef struct
  {
    INT                   nrBands;             /*!< Number of QMF bands. */
    INT                   cplxBands;           /*!< Number of complex QMF bands.*/
  
    HANDLE_FDK_HYBRID_SETUP pSetup;            /*!< Pointer to filter setup. */
  
  } FDK_SYN_HYB_FILTER;
  
  typedef FDK_ANA_HYB_FILTER *HANDLE_FDK_ANA_HYB_FILTER;
  typedef FDK_SYN_HYB_FILTER *HANDLE_FDK_SYN_HYB_FILTER;
  
  
  /**
   * \brief  Create one instance of Hybrid Analyis Filterbank.
   *
   * \param hAnalysisHybFilter  Pointer to an outlying allocated Hybrid Analysis Filterbank structure.
   * \param pLFmemory           Pointer to outlying buffer used LF filtering.
   * \param LFmemorySize        Size of pLFmemory in bytes.
   * \param pHFmemory           Pointer to outlying buffer used HF delay line.
   * \param HFmemorySize        Size of pLFmemory in bytes.
   *
   * \return  0 on success.
   */
  INT FDKhybridAnalysisOpen(
          HANDLE_FDK_ANA_HYB_FILTER  hAnalysisHybFilter,
          FIXP_DBL *const            pLFmemory,
          const UINT                 LFmemorySize,
          FIXP_DBL *const            pHFmemory,
          const UINT                 HFmemorySize
          );
  
  
  /**
   * \brief  Initialize and configure Hybrdid Analysis Filterbank instance.
   *
   * \param hAnalysisHybFilter  A Hybrid Analysis Filterbank handle.
   * \param mode                Select hybrid filter configuration.
   * \param qmfBands            Number of qmf bands to be processed.
   * \param cplxBands           Number of complex qmf bands to be processed.
   * \param initStatesFlag      Indicates whether the states buffer has to be cleared.
   *
   * \return  0 on success.
   */
  INT FDKhybridAnalysisInit(
          HANDLE_FDK_ANA_HYB_FILTER  hAnalysisHybFilter,
          const FDK_HYBRID_MODE      mode,
          const INT                  qmfBands,
          const INT                  cplxBands,
          const INT                  initStatesFlag
          );
  
  
  /**
   * \brief  Adjust Hybrdid Analysis Filterbank states.
   *
   * \param hAnalysisHybFilter  A Hybrid Analysis Filterbank handle.
   * \param scalingValue        Scaling value to be applied on filter states.
   *
   * \return  0 on success.
   */
  INT FDKhybridAnalysisScaleStates(
          HANDLE_FDK_ANA_HYB_FILTER  hAnalysisHybFilter,
          const INT                  scalingValue
          );
  
  
  /**
   * \brief  Apply Hybrid Analysis Filterbank on Qmf input data.
   *
   * \param hAnalysisHybFilter  A Hybrid Analysis Filterbank handle.
   * \param pQmfReal            Qmf input data.
   * \param pQmfImag            Qmf input data.
   * \param pHybridReal         Hybrid output data.
   * \param pHybridImag         Hybrid output data.
   *
   * \return  0 on success.
   */
  INT FDKhybridAnalysisApply(
          HANDLE_FDK_ANA_HYB_FILTER  hAnalysisHybFilter,
          const FIXP_DBL *const      pQmfReal,
          const FIXP_DBL *const      pQmfImag,
          FIXP_DBL *const            pHybridReal,
          FIXP_DBL *const            pHybridImag
          );
  
  
  /**
   * \brief  Close a Hybrid Analysis Filterbank instance.
   *
   * \param hAnalysisHybFilter  Pointer to a Hybrid Analysis Filterbank instance.
   *
   * \return  0 on success.
   */
  INT FDKhybridAnalysisClose(
          HANDLE_FDK_ANA_HYB_FILTER  hAnalysisHybFilter
          );
  
  /**
   * \brief  Initialize and configure Hybrdid Synthesis Filterbank instance.
   *
   * \param hSynthesisHybFilter A Hybrid Synthesis Filterbank handle.
   * \param mode                Select hybrid filter configuration.
   * \param qmfBands            Number of qmf bands to be processed.
   * \param cplxBands           Number of complex qmf bands to be processed.
   *
   * \return  0 on success.
   */
  INT FDKhybridSynthesisInit(
          HANDLE_FDK_SYN_HYB_FILTER  hSynthesisHybFilter,
          const FDK_HYBRID_MODE      mode,
          const INT                  qmfBands,
          const INT                  cplxBands
          );
  
  /**
   * \brief  Apply Hybrid Analysis Filterbank on Hybrid data.
   *
   * \param hSynthesisHybFilter  A Hybrid Analysis Filterbandk handle.
   * \param pHybridReal          Hybrid input data.
   * \param pHybridImag          Hybrid input data.
   * \param pQmfReal             Qmf output data.
   * \param pQmfImag             Qmf output data.
   *
   * \return  0 on success.
   */
  INT FDKhybridSynthesisApply(
          HANDLE_FDK_SYN_HYB_FILTER  hSynthesisHybFilter,
          const FIXP_DBL *const      pHybridReal,
          const FIXP_DBL *const      pHybridImag,
          FIXP_DBL *const            pQmfReal,
          FIXP_DBL *const            pQmfImag
          );
  
  
  #endif /* __FDK_HYBRID_H */
  