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 Transient detector prototypes 87 */ 88 #ifndef __TRAN_DET_H 89 #define __TRAN_DET_H 90 91 #include "sbr_encoder.h" 92 #include "sbr_def.h" 93 94 typedef struct 95 { 96 FIXP_DBL transients[QMF_MAX_TIME_SLOTS+(QMF_MAX_TIME_SLOTS/2)]; 97 FIXP_DBL thresholds[QMF_CHANNELS]; 98 FIXP_DBL tran_thr; /* Master threshold for transient signals */ 99 FIXP_DBL split_thr_m; /* Threshold for splitting FIXFIX-frames into 2 env */ 100 INT split_thr_e; /* Scale for splitting threshold */ 101 FIXP_DBL prevLowBandEnergy; /* Energy of low band */ 102 FIXP_DBL prevHighBandEnergy; /* Energy of high band */ 103 INT tran_fc; /* Number of lowband subbands to discard */ 104 INT no_cols; 105 INT no_rows; 106 INT mode; 107 108 int frameShift; 109 int tran_off; /* Offset for reading energy values. */ 110 } 111 SBR_TRANSIENT_DETECTOR; 112 113 114 typedef SBR_TRANSIENT_DETECTOR *HANDLE_SBR_TRANSIENT_DETECTOR; 115 116 #define TRAN_DET_LOOKAHEAD 2 117 #define TRAN_DET_START_FREQ 4500 /*start frequency for transient detection*/ 118 #define TRAN_DET_STOP_FREQ 13500 /*stop frequency for transient detection*/ 119 #define TRAN_DET_MIN_QMFBANDS 4 /* minimum qmf bands for transient detection */ 120 #define QMF_HP_dBd_SLOPE_FIX FL2FXCONST_DBL(0.00075275f) /* 0.002266f/10 * log2(10) */ 121 #define TRAN_DET_THRSHLD FL2FXCONST_DBL(3.2f/4.f) 122 #define TRAN_DET_THRSHLD_SCALE (2) 123 124 typedef struct 125 { 126 INT transientCandidates[QMF_MAX_TIME_SLOTS + TRAN_DET_LOOKAHEAD]; 127 INT nTimeSlots; 128 INT lookahead; 129 INT startBand; 130 INT stopBand; 131 132 FIXP_DBL dBf_m[QMF_CHANNELS]; 133 INT dBf_e[QMF_CHANNELS]; 134 135 FIXP_DBL energy_timeSlots[QMF_MAX_TIME_SLOTS + TRAN_DET_LOOKAHEAD]; 136 INT energy_timeSlots_scale[QMF_MAX_TIME_SLOTS + TRAN_DET_LOOKAHEAD]; 137 138 FIXP_DBL delta_energy[QMF_MAX_TIME_SLOTS + TRAN_DET_LOOKAHEAD]; 139 INT delta_energy_scale[QMF_MAX_TIME_SLOTS + TRAN_DET_LOOKAHEAD]; 140 141 FIXP_DBL lowpass_energy[QMF_MAX_TIME_SLOTS + TRAN_DET_LOOKAHEAD]; 142 INT lowpass_energy_scale[QMF_MAX_TIME_SLOTS + TRAN_DET_LOOKAHEAD]; 143 #if defined (FTD_LOG) 144 FDKFILE *ftd_log; 145 #endif 146 } 147 FAST_TRAN_DETECTOR; 148 typedef FAST_TRAN_DETECTOR *HANDLE_FAST_TRAN_DET; 149 150 151 INT FDKsbrEnc_InitSbrFastTransientDetector( 152 HANDLE_FAST_TRAN_DET h_sbrFastTransientDetector, 153 const INT time_slots_per_frame, 154 const INT bandwidth_qmf_slot, 155 const INT no_qmf_channels, 156 const INT sbr_qmf_1st_band 157 ); 158 159 void FDKsbrEnc_fastTransientDetect( 160 const HANDLE_FAST_TRAN_DET h_sbrFastTransientDetector, 161 const FIXP_DBL *const *Energies, 162 const int *const scaleEnergies, 163 const INT YBufferWriteOffset, 164 UCHAR *const tran_vector 165 ); 166 167 void 168 FDKsbrEnc_transientDetect(HANDLE_SBR_TRANSIENT_DETECTOR h_sbrTransientDetector, 169 FIXP_DBL **Energies, 170 INT *scaleEnergies, 171 UCHAR *tran_vector, 172 int YBufferWriteOffset, 173 int YBufferSzShift, 174 int timeStep, 175 int frameMiddleBorder); 176 177 int 178 FDKsbrEnc_InitSbrTransientDetector (HANDLE_SBR_TRANSIENT_DETECTOR h_sbrTransientDetector, 179 UINT sbrSyntaxFlags, /* SBR syntax flags derived from AOT. */ 180 INT frameSize, 181 INT sampleFreq, 182 sbrConfigurationPtr params, 183 int tran_fc, 184 int no_cols, 185 int no_rows, 186 int YBufferWriteOffset, 187 int YBufferSzShift, 188 int frameShift, 189 int tran_off); 190 191 void 192 FDKsbrEnc_frameSplitter(FIXP_DBL **Energies, 193 INT *scaleEnergies, 194 HANDLE_SBR_TRANSIENT_DETECTOR h_sbrTransientDetector, 195 UCHAR *freqBandTable, 196 UCHAR *tran_vector, 197 int YBufferWriteOffset, 198 int YBufferSzShift, 199 int nSfb, 200 int timeStep, 201 int no_cols, 202 FIXP_DBL* tonality); 203 #endif 204
