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      1 
      2 /* -----------------------------------------------------------------------------------------------------------
      3 Software License for The Fraunhofer FDK AAC Codec Library for Android
      4 
      5  Copyright  1995 - 2015 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  General tonality correction detector module.
     87 */
     88 #ifndef _TON_CORR_EST_H
     89 #define _TON_CORR_EST_H
     90 
     91 #include "sbr_encoder.h"
     92 #include "mh_det.h"
     93 #include "nf_est.h"
     94 #include "invf_est.h"
     95 
     96 
     97 #define MAX_NUM_PATCHES 6
     98 #define SCALE_NRGVEC 4
     99 
    100 /** parameter set for one single patch */
    101 typedef struct {
    102   INT    sourceStartBand;         /*!< first band in lowbands where to take the samples from */
    103   INT    sourceStopBand;          /*!< first band in lowbands which is not included in the patch anymore */
    104   INT    guardStartBand;          /*!< first band in highbands to be filled with zeros in order to
    105                                          reduce interferences between patches */
    106   INT    targetStartBand;         /*!< first band in highbands to be filled with whitened lowband signal */
    107   INT    targetBandOffs;          /*!< difference between 'startTargetBand' and 'startSourceBand' */
    108   INT    numBandsInPatch;         /*!< number of consecutive bands in this one patch */
    109 } PATCH_PARAM;
    110 
    111 
    112 
    113 
    114 typedef struct
    115 {
    116   INT switchInverseFilt;          /*!< Flag to enable dynamic adaption of invf. detection */
    117   INT noQmfChannels;
    118   INT bufferLength;               /*!< Length of the r and i buffers. */
    119   INT stepSize;                   /*!< Stride for the lpc estimate. */
    120   INT numberOfEstimates;          /*!< The total number of estiamtes, available in the quotaMatrix.*/
    121   UINT numberOfEstimatesPerFrame; /*!< The number of estimates per frame available in the quotaMatrix.*/
    122   INT lpcLength[2];               /*!< Segment length used for second order LPC analysis.*/
    123   INT nextSample;                 /*!< Where to start the LPC analysis of the current frame.*/
    124   INT move;                       /*!< How many estimates to move in the quotaMatrix, when buffering. */
    125   INT frameStartIndex;            /*!< The start index for the current frame in the r and i buffers. */
    126   INT startIndexMatrix;           /*!< The start index for the current frame in the quotaMatrix. */
    127   INT frameStartIndexInvfEst;     /*!< The start index of the inverse filtering, not the same as the others,
    128                                        dependent on what decoder is used (buffer opt, or no buffer opt). */
    129   INT prevTransientFlag;          /*!< The transisent flag (from the transient detector) for the previous frame. */
    130   INT transientNextFrame;         /*!< Flag to indicate that the transient will show up in the next frame. */
    131   INT transientPosOffset;         /*!< An offset value to match the transient pos as calculated by the transient detector
    132                                        with the actual position in the frame.*/
    133 
    134   INT *signMatrix[MAX_NO_OF_ESTIMATES];      /*!< Matrix holding the sign of each channe, i.e. indicating in what
    135                                                   part of a QMF channel a possible sine is. */
    136 
    137   FIXP_DBL *quotaMatrix[MAX_NO_OF_ESTIMATES];/*!< Matrix holding the quota values for all estimates, all channels. */
    138 
    139   FIXP_DBL nrgVector[MAX_NO_OF_ESTIMATES];   /*!< Vector holding the averaged energies for every QMF band. */
    140   FIXP_DBL nrgVectorFreq[QMF_CHANNELS];      /*!< Vector holding the averaged energies for every QMF channel */
    141 
    142   SCHAR indexVector[QMF_CHANNELS];           /*!< Index vector poINTing to the correct lowband channel,
    143                                                   when indexing a highband channel, -1 represents a guard band */
    144   PATCH_PARAM  patchParam[MAX_NUM_PATCHES];  /*!< new parameter set for patching */
    145   INT    guard;                              /*!< number of guardbands between every patch */
    146   INT    shiftStartSb;                       /*!< lowest subband of source range to be included in the patches */
    147   INT    noOfPatches;                        /*!< number of patches */
    148 
    149   SBR_MISSING_HARMONICS_DETECTOR sbrMissingHarmonicsDetector;  /*!< SBR_MISSING_HARMONICS_DETECTOR struct. */
    150   SBR_NOISE_FLOOR_ESTIMATE sbrNoiseFloorEstimate;              /*!< SBR_NOISE_FLOOR_ESTIMATE struct. */
    151   SBR_INV_FILT_EST sbrInvFilt;                                 /*!< SBR_INV_FILT_EST struct. */
    152 }
    153 SBR_TON_CORR_EST;
    154 
    155 typedef SBR_TON_CORR_EST *HANDLE_SBR_TON_CORR_EST;
    156 
    157 void
    158 FDKsbrEnc_TonCorrParamExtr(HANDLE_SBR_TON_CORR_EST hTonCorr,   /*!< Handle to SBR_TON_CORR struct. */
    159                  INVF_MODE* infVec,                  /*!< Vector where the inverse filtering levels will be stored. */
    160                  FIXP_DBL * noiseLevels,             /*!< Vector where the noise levels will be stored. */
    161                  INT* missingHarmonicFlag,           /*!< Flag set to one or zero, dependent on if any strong sines are missing.*/
    162                  UCHAR* missingHarmonicsIndex,       /*!< Vector indicating where sines are missing. */
    163                  UCHAR* envelopeCompensation,        /*!< Vector to store compensation values for the energies in. */
    164                  const SBR_FRAME_INFO *frameInfo,    /*!< Frame info struct, contains the time and frequency grid of the current frame.*/
    165                  UCHAR* transientInfo,               /*!< Transient info.*/
    166                  UCHAR * freqBandTable,              /*!< Frequency band tables for high-res.*/
    167                  INT nSfb,                           /*!< Number of scalefactor bands for high-res. */
    168                  XPOS_MODE xposType,                 /*!< Type of transposer used in the decoder.*/
    169                  UINT sbrSyntaxFlags
    170                  );
    171 
    172 INT
    173 FDKsbrEnc_CreateTonCorrParamExtr(HANDLE_SBR_TON_CORR_EST hTonCorr, /*!< Pointer to handle to SBR_TON_CORR struct. */
    174                                  INT                     chan);    /*!< Channel index, needed for mem allocation */
    175 
    176 INT
    177 FDKsbrEnc_InitTonCorrParamExtr(INT frameSize,                      /*!< Current SBR frame size. */
    178                                HANDLE_SBR_TON_CORR_EST hTonCorr,   /*!< Pointer to handle to SBR_TON_CORR struct. */
    179                                HANDLE_SBR_CONFIG_DATA sbrCfg,      /*!< Pointer to SBR configuration parameters. */
    180                                INT timeSlots,                      /*!< Number of time-slots per frame */
    181                                INT xposCtrl,                       /*!< Different patch modes. */
    182                                INT ana_max_level,                  /*!< Maximum level of the adaptive noise. */
    183                                INT noiseBands,                     /*!< Number of noise bands per octave. */
    184                                INT noiseFloorOffset,               /*!< Noise floor offset. */
    185                                UINT useSpeechConfig                /*!< Speech or music tuning. */
    186                               );
    187 
    188 void
    189 FDKsbrEnc_DeleteTonCorrParamExtr(HANDLE_SBR_TON_CORR_EST hTonCorr); /*!< Handle to SBR_TON_CORR struct. */
    190 
    191 
    192 void
    193 FDKsbrEnc_CalculateTonalityQuotas(HANDLE_SBR_TON_CORR_EST hTonCorr,
    194                         FIXP_DBL **sourceBufferReal,
    195                         FIXP_DBL **sourceBufferImag,
    196                         INT usb,
    197                         INT qmfScale                    /*!< sclefactor of QMF subsamples */
    198                        );
    199 
    200 INT
    201 FDKsbrEnc_ResetTonCorrParamExtr(HANDLE_SBR_TON_CORR_EST hTonCorr, /*!< Handle to SBR_TON_CORR struct. */
    202                       INT xposctrl,                     /*!< Different patch modes. */
    203                       INT highBandStartSb,              /*!< Start band of the SBR range. */
    204                       UCHAR *v_k_master,        /*!< Master frequency table from which all other table are derived.*/
    205                       INT numMaster,                    /*!< Number of elements in the master table. */
    206                       INT fs,                           /*!< Sampling frequency (of the SBR part). */
    207                       UCHAR** freqBandTable,    /*!< Frequency band table for low-res and high-res. */
    208                       INT* nSfb,                        /*!< Number of frequency bands (hig-res and low-res). */
    209                       INT noQmfChannels                 /*!< Number of QMF channels. */
    210                       );
    211 #endif
    212 
    213