1 /* ----------------------------------------------------------------------------- 2 Software License for The Fraunhofer FDK AAC Codec Library for Android 3 4 Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Frderung der angewandten 5 Forschung e.V. All rights reserved. 6 7 1. INTRODUCTION 8 The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software 9 that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding 10 scheme for digital audio. This FDK AAC Codec software is intended to be used on 11 a wide variety of Android devices. 12 13 AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient 14 general perceptual audio codecs. AAC-ELD is considered the best-performing 15 full-bandwidth communications codec by independent studies and is widely 16 deployed. AAC has been standardized by ISO and IEC as part of the MPEG 17 specifications. 18 19 Patent licenses for necessary patent claims for the FDK AAC Codec (including 20 those of Fraunhofer) may be obtained through Via Licensing 21 (www.vialicensing.com) or through the respective patent owners individually for 22 the purpose of encoding or decoding bit streams in products that are compliant 23 with the ISO/IEC MPEG audio standards. Please note that most manufacturers of 24 Android devices already license these patent claims through Via Licensing or 25 directly from the patent owners, and therefore FDK AAC Codec software may 26 already be covered under those patent licenses when it is used for those 27 licensed purposes only. 28 29 Commercially-licensed AAC software libraries, including floating-point versions 30 with enhanced sound quality, are also available from Fraunhofer. Users are 31 encouraged to check the Fraunhofer website for additional applications 32 information and documentation. 33 34 2. COPYRIGHT LICENSE 35 36 Redistribution and use in source and binary forms, with or without modification, 37 are permitted without payment of copyright license fees provided that you 38 satisfy the following conditions: 39 40 You must retain the complete text of this software license in redistributions of 41 the FDK AAC Codec or your modifications thereto in source code form. 42 43 You must retain the complete text of this software license in the documentation 44 and/or other materials provided with redistributions of the FDK AAC Codec or 45 your modifications thereto in binary form. You must make available free of 46 charge copies of the complete source code of the FDK AAC Codec and your 47 modifications thereto to recipients of copies in binary form. 48 49 The name of Fraunhofer may not be used to endorse or promote products derived 50 from this library without prior written permission. 51 52 You may not charge copyright license fees for anyone to use, copy or distribute 53 the FDK AAC Codec software or your modifications thereto. 54 55 Your modified versions of the FDK AAC Codec must carry prominent notices stating 56 that you changed the software and the date of any change. For modified versions 57 of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android" 58 must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK 59 AAC Codec Library for Android." 60 61 3. NO PATENT LICENSE 62 63 NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without 64 limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE. 65 Fraunhofer provides no warranty of patent non-infringement with respect to this 66 software. 67 68 You may use this FDK AAC Codec software or modifications thereto only for 69 purposes that are authorized by appropriate patent licenses. 70 71 4. DISCLAIMER 72 73 This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright 74 holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, 75 including but not limited to the implied warranties of merchantability and 76 fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 77 CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, 78 or consequential damages, including but not limited to procurement of substitute 79 goods or services; loss of use, data, or profits, or business interruption, 80 however caused and on any theory of liability, whether in contract, strict 81 liability, or tort (including negligence), arising in any way out of the use of 82 this software, even if advised of the possibility of such damage. 83 84 5. CONTACT INFORMATION 85 86 Fraunhofer Institute for Integrated Circuits IIS 87 Attention: Audio and Multimedia Departments - FDK AAC LL 88 Am Wolfsmantel 33 89 91058 Erlangen, Germany 90 91 www.iis.fraunhofer.de/amm 92 amm-info (at) iis.fraunhofer.de 93 ----------------------------------------------------------------------------- */ 94 95 /**************************** SBR encoder library ****************************** 96 97 Author(s): 98 99 Description: 100 101 *******************************************************************************/ 102 103 /*! 104 \file 105 \brief missing harmonics detection header file $Revision: 92790 $ 106 */ 107 108 #ifndef MH_DET_H 109 #define MH_DET_H 110 111 #include "sbr_encoder.h" 112 #include "fram_gen.h" 113 114 typedef struct { 115 FIXP_DBL thresHoldDiff; /*!< threshold for tonality difference */ 116 FIXP_DBL thresHoldDiffGuide; /*!< threshold for tonality difference for the 117 guide */ 118 FIXP_DBL thresHoldTone; /*!< threshold for tonality for a sine */ 119 FIXP_DBL invThresHoldTone; 120 FIXP_DBL thresHoldToneGuide; /*!< threshold for tonality for a sine for the 121 guide */ 122 FIXP_DBL sfmThresSbr; /*!< tonality flatness measure threshold for the SBR 123 signal.*/ 124 FIXP_DBL sfmThresOrig; /*!< tonality flatness measure threshold for the 125 original signal.*/ 126 FIXP_DBL decayGuideOrig; /*!< decay value of the tonality value of the guide 127 for the tone. */ 128 FIXP_DBL decayGuideDiff; /*!< decay value of the tonality value of the guide 129 for the tonality difference. */ 130 FIXP_DBL derivThresMaxLD64; /*!< threshold for detecting LP character in a 131 signal. */ 132 FIXP_DBL derivThresBelowLD64; /*!< threshold for detecting LP character in a 133 signal. */ 134 FIXP_DBL derivThresAboveLD64; /*!< threshold for detecting LP character in a 135 signal. */ 136 } THRES_HOLDS; 137 138 typedef struct { 139 INT deltaTime; /*!< maximum allowed transient distance (from frame border in 140 number of qmf subband sample) for a frame to be considered a 141 transient frame.*/ 142 THRES_HOLDS thresHolds; /*!< the thresholds used for detection. */ 143 INT maxComp; /*!< maximum alllowed compensation factor for the envelope data. 144 */ 145 } DETECTOR_PARAMETERS_MH; 146 147 typedef struct { 148 FIXP_DBL *guideVectorDiff; 149 FIXP_DBL *guideVectorOrig; 150 UCHAR *guideVectorDetected; 151 } GUIDE_VECTORS; 152 153 typedef struct { 154 INT qmfNoChannels; 155 INT nSfb; 156 INT sampleFreq; 157 INT previousTransientFlag; 158 INT previousTransientFrame; 159 INT previousTransientPos; 160 161 INT noVecPerFrame; 162 INT transientPosOffset; 163 164 INT move; 165 INT totNoEst; 166 INT noEstPerFrame; 167 INT timeSlots; 168 169 UCHAR *guideScfb; 170 UCHAR *prevEnvelopeCompensation; 171 UCHAR *detectionVectors[MAX_NO_OF_ESTIMATES]; 172 FIXP_DBL tonalityDiff[MAX_NO_OF_ESTIMATES / 2][MAX_FREQ_COEFFS]; 173 FIXP_DBL sfmOrig[MAX_NO_OF_ESTIMATES / 2][MAX_FREQ_COEFFS]; 174 FIXP_DBL sfmSbr[MAX_NO_OF_ESTIMATES / 2][MAX_FREQ_COEFFS]; 175 const DETECTOR_PARAMETERS_MH *mhParams; 176 GUIDE_VECTORS guideVectors[MAX_NO_OF_ESTIMATES]; 177 } SBR_MISSING_HARMONICS_DETECTOR; 178 179 typedef SBR_MISSING_HARMONICS_DETECTOR *HANDLE_SBR_MISSING_HARMONICS_DETECTOR; 180 181 void FDKsbrEnc_SbrMissingHarmonicsDetectorQmf( 182 HANDLE_SBR_MISSING_HARMONICS_DETECTOR h_sbrMissingHarmonicsDetector, 183 FIXP_DBL **pQuotaBuffer, INT **pSignBuffer, SCHAR *indexVector, 184 const SBR_FRAME_INFO *pFrameInfo, const UCHAR *pTranInfo, 185 INT *pAddHarmonicsFlag, UCHAR *pAddHarmonicsScaleFactorBands, 186 const UCHAR *freqBandTable, INT nSfb, UCHAR *envelopeCompensation, 187 FIXP_DBL *pNrgVector); 188 189 INT FDKsbrEnc_CreateSbrMissingHarmonicsDetector( 190 HANDLE_SBR_MISSING_HARMONICS_DETECTOR hSbrMHDet, INT chan); 191 192 INT FDKsbrEnc_InitSbrMissingHarmonicsDetector( 193 HANDLE_SBR_MISSING_HARMONICS_DETECTOR h_sbrMissingHarmonicsDetector, 194 INT sampleFreq, INT frameSize, INT nSfb, INT qmfNoChannels, INT totNoEst, 195 INT move, INT noEstPerFrame, UINT sbrSyntaxFlags); 196 197 void FDKsbrEnc_DeleteSbrMissingHarmonicsDetector( 198 HANDLE_SBR_MISSING_HARMONICS_DETECTOR h_sbrMissingHarmonicsDetector); 199 200 INT FDKsbrEnc_ResetSbrMissingHarmonicsDetector( 201 HANDLE_SBR_MISSING_HARMONICS_DETECTOR hSbrMissingHarmonicsDetector, 202 INT nSfb); 203 204 #endif 205
