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 Transient detector prototypes $Revision: 95111 $ 106 */ 107 #ifndef TRAN_DET_H 108 #define TRAN_DET_H 109 110 #include "sbr_encoder.h" 111 #include "sbr_def.h" 112 113 typedef struct { 114 FIXP_DBL transients[32 + (32 / 2)]; 115 FIXP_DBL thresholds[64]; 116 FIXP_DBL tran_thr; /* Master threshold for transient signals */ 117 FIXP_DBL split_thr_m; /* Threshold for splitting FIXFIX-frames into 2 env */ 118 INT split_thr_e; /* Scale for splitting threshold */ 119 FIXP_DBL prevLowBandEnergy; /* Energy of low band */ 120 FIXP_DBL prevHighBandEnergy; /* Energy of high band */ 121 INT tran_fc; /* Number of lowband subbands to discard */ 122 INT no_cols; 123 INT no_rows; 124 INT mode; 125 126 int frameShift; 127 int tran_off; /* Offset for reading energy values. */ 128 } SBR_TRANSIENT_DETECTOR; 129 130 typedef SBR_TRANSIENT_DETECTOR *HANDLE_SBR_TRANSIENT_DETECTOR; 131 132 #define TRAN_DET_LOOKAHEAD 2 133 #define TRAN_DET_START_FREQ 4500 /*start frequency for transient detection*/ 134 #define TRAN_DET_STOP_FREQ 13500 /*stop frequency for transient detection*/ 135 #define TRAN_DET_MIN_QMFBANDS \ 136 4 /* minimum qmf bands for transient detection \ 137 */ 138 #define QMF_HP_dBd_SLOPE_FIX \ 139 FL2FXCONST_DBL(0.00075275f) /* 0.002266f/10 * log2(10) */ 140 #define TRAN_DET_THRSHLD FL2FXCONST_DBL(5.0f / 8.0f) 141 #define TRAN_DET_THRSHLD_SCALE (3) 142 143 typedef struct { 144 INT transientCandidates[32 + TRAN_DET_LOOKAHEAD]; 145 INT nTimeSlots; 146 INT lookahead; 147 INT startBand; 148 INT stopBand; 149 150 FIXP_DBL dBf_m[64]; 151 INT dBf_e[64]; 152 153 FIXP_DBL energy_timeSlots[32 + TRAN_DET_LOOKAHEAD]; 154 INT energy_timeSlots_scale[32 + TRAN_DET_LOOKAHEAD]; 155 156 FIXP_DBL delta_energy[32 + TRAN_DET_LOOKAHEAD]; 157 INT delta_energy_scale[32 + TRAN_DET_LOOKAHEAD]; 158 159 FIXP_DBL lowpass_energy[32 + TRAN_DET_LOOKAHEAD]; 160 INT lowpass_energy_scale[32 + TRAN_DET_LOOKAHEAD]; 161 } FAST_TRAN_DETECTOR; 162 typedef FAST_TRAN_DETECTOR *HANDLE_FAST_TRAN_DET; 163 164 INT FDKsbrEnc_InitSbrFastTransientDetector( 165 HANDLE_FAST_TRAN_DET h_sbrFastTransientDetector, 166 const INT time_slots_per_frame, const INT bandwidth_qmf_slot, 167 const INT no_qmf_channels, const INT sbr_qmf_1st_band); 168 169 void FDKsbrEnc_fastTransientDetect( 170 const HANDLE_FAST_TRAN_DET h_sbrFastTransientDetector, 171 const FIXP_DBL *const *Energies, const int *const scaleEnergies, 172 const INT YBufferWriteOffset, UCHAR *const tran_vector); 173 174 void FDKsbrEnc_transientDetect( 175 HANDLE_SBR_TRANSIENT_DETECTOR h_sbrTransientDetector, FIXP_DBL **Energies, 176 INT *scaleEnergies, UCHAR *tran_vector, int YBufferWriteOffset, 177 int YBufferSzShift, int timeStep, int frameMiddleBorder); 178 179 int FDKsbrEnc_InitSbrTransientDetector( 180 HANDLE_SBR_TRANSIENT_DETECTOR h_sbrTransientDetector, 181 UINT sbrSyntaxFlags, /* SBR syntax flags derived from AOT. */ 182 INT frameSize, INT sampleFreq, sbrConfigurationPtr params, int tran_fc, 183 int no_cols, int no_rows, int YBufferWriteOffset, int YBufferSzShift, 184 int frameShift, int tran_off); 185 186 void FDKsbrEnc_frameSplitter( 187 FIXP_DBL **Energies, INT *scaleEnergies, 188 HANDLE_SBR_TRANSIENT_DETECTOR h_sbrTransientDetector, UCHAR *freqBandTable, 189 UCHAR *tran_vector, int YBufferWriteOffset, int YBufferSzShift, int nSfb, 190 int timeStep, int no_cols, FIXP_DBL *tonality); 191 #endif 192
