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      1 
      2 /* -----------------------------------------------------------------------------------------------------------
      3 Software License for The Fraunhofer FDK AAC Codec Library for Android
      4 
      5  Copyright  1995 - 2013 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 /*!
     85   \file
     86   \brief  Inverse Filtering detection prototypes
     87 */
     88 #ifndef _INV_FILT_DET_H
     89 #define _INV_FILT_DET_H
     90 
     91 #include "sbr_encoder.h"
     92 #include "sbr_def.h"
     93 
     94 #define INVF_SMOOTHING_LENGTH 2
     95 
     96 typedef struct
     97 {
     98   const FIXP_DBL *quantStepsSbr;
     99   const FIXP_DBL *quantStepsOrig;
    100   const FIXP_DBL *nrgBorders;
    101   INT   numRegionsSbr;
    102   INT   numRegionsOrig;
    103   INT   numRegionsNrg;
    104   INVF_MODE regionSpace[5][5];
    105   INVF_MODE regionSpaceTransient[5][5];
    106   INT EnergyCompFactor[5];
    107 
    108 }DETECTOR_PARAMETERS;
    109 
    110 typedef struct
    111 {
    112   FIXP_DBL  origQuotaMean[INVF_SMOOTHING_LENGTH+1];
    113   FIXP_DBL  sbrQuotaMean[INVF_SMOOTHING_LENGTH+1];
    114   FIXP_DBL  origQuotaMeanStrongest[INVF_SMOOTHING_LENGTH+1];
    115   FIXP_DBL  sbrQuotaMeanStrongest[INVF_SMOOTHING_LENGTH+1];
    116 
    117   FIXP_DBL origQuotaMeanFilt;
    118   FIXP_DBL sbrQuotaMeanFilt;
    119   FIXP_DBL origQuotaMeanStrongestFilt;
    120   FIXP_DBL sbrQuotaMeanStrongestFilt;
    121 
    122   FIXP_DBL origQuotaMax;
    123   FIXP_DBL sbrQuotaMax;
    124 
    125   FIXP_DBL avgNrg;
    126 }DETECTOR_VALUES;
    127 
    128 
    129 
    130 typedef struct
    131 {
    132   INT numberOfStrongest;
    133 
    134   INT prevRegionSbr[MAX_NUM_NOISE_VALUES];
    135   INT prevRegionOrig[MAX_NUM_NOISE_VALUES];
    136 
    137   INT freqBandTableInvFilt[MAX_NUM_NOISE_VALUES];
    138   INT noDetectorBands;
    139   INT noDetectorBandsMax;
    140 
    141   const DETECTOR_PARAMETERS *detectorParams;
    142 
    143   INVF_MODE prevInvfMode[MAX_NUM_NOISE_VALUES];
    144   DETECTOR_VALUES detectorValues[MAX_NUM_NOISE_VALUES];
    145 
    146   FIXP_DBL nrgAvg;
    147   FIXP_DBL wmQmf[MAX_NUM_NOISE_VALUES];
    148 }
    149 SBR_INV_FILT_EST;
    150 
    151 typedef SBR_INV_FILT_EST *HANDLE_SBR_INV_FILT_EST;
    152 
    153 void
    154 FDKsbrEnc_qmfInverseFilteringDetector(HANDLE_SBR_INV_FILT_EST hInvFilt,
    155                             FIXP_DBL ** quotaMatrix,
    156                             FIXP_DBL *nrgVector,
    157                             SCHAR    *indexVector,
    158                             INT startIndex,
    159                             INT stopIndex,
    160                             INT transientFlag,
    161                             INVF_MODE* infVec);
    162 
    163 INT
    164 FDKsbrEnc_initInvFiltDetector (HANDLE_SBR_INV_FILT_EST hInvFilt,
    165                        INT* freqBandTableDetector,
    166                        INT numDetectorBands,
    167                        UINT useSpeechConfig);
    168 
    169 INT
    170 FDKsbrEnc_resetInvFiltDetector(HANDLE_SBR_INV_FILT_EST hInvFilt,
    171                      INT* freqBandTableDetector,
    172                      INT numDetectorBands);
    173 
    174 #endif /* _QMF_INV_FILT_H */
    175 
    176