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      1 
      2 /* -----------------------------------------------------------------------------------------------------------
      3 Software License for The Fraunhofer FDK AAC Codec Library for Android
      4 
      5  Copyright  1995 - 2012 Fraunhofer-Gesellschaft zur Frderung 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
     30 
     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:
     33 
     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.
     36 
     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.
     41 
     42 The name of Fraunhofer may not be used to endorse or promote products derived from this library without
     43 prior written permission.
     44 
     45 You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
     46 software or your modifications thereto.
     47 
     48 Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
     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."
     52 
     53 3.    NO PATENT LICENSE
     54 
     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.
     58 
     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
     67 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
     68 including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
     69 or business interruption, however caused and on any theory of liability, whether in contract, strict
     70 liability, or tort (including negligence), arising in any way out of the use of this software, even if
     71 advised of the possibility of such damage.
     72 
     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 (at) 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 */
    166