1 2 /* ----------------------------------------------------------------------------------------------------------- 3 Software License for The Fraunhofer FDK AAC Codec Library for Android 4 5 Copyright 1995 - 2012 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 Low Power Profile Transposer, 87 */ 88 89 #ifndef _LPP_TRANS_H 90 #define _LPP_TRANS_H 91 92 #include "sbrdecoder.h" 93 #include "qmf.h" 94 95 /* 96 Common 97 */ 98 #define QMF_OUT_SCALE 8 99 100 /* 101 Env-Adjust 102 */ 103 #define MAX_NOISE_ENVELOPES 2 104 #define MAX_NOISE_COEFFS 5 105 #define MAX_NUM_NOISE_VALUES (MAX_NOISE_ENVELOPES * MAX_NOISE_COEFFS) 106 #define MAX_NUM_LIMITERS 12 107 108 /* Set MAX_ENVELOPES to the largest value of all supported BSFORMATs 109 by overriding MAX_ENVELOPES in the correct order: */ 110 #define MAX_ENVELOPES_HEAAC 5 111 #define MAX_ENVELOPES MAX_ENVELOPES_HEAAC 112 113 #define MAX_FREQ_COEFFS 48 114 #define MAX_FREQ_COEFFS_FS44100 35 115 #define MAX_FREQ_COEFFS_FS48000 32 116 117 118 #define MAX_NUM_ENVELOPE_VALUES (MAX_ENVELOPES * MAX_FREQ_COEFFS) 119 120 #define MAX_GAIN_EXP 34 121 /* Maximum gain will be sqrt(0.5 * 2^MAX_GAIN_EXP) 122 example: 34=99dB */ 123 #define MAX_GAIN_CONCEAL_EXP 1 124 /* Maximum gain will be sqrt(0.5 * 2^MAX_GAIN_CONCEAL_EXP) in concealment case (0dB) */ 125 126 /* 127 LPP Transposer 128 */ 129 #define LPC_ORDER 2 130 131 #define MAX_INVF_BANDS MAX_NOISE_COEFFS 132 133 #define MAX_NUM_PATCHES 6 134 #define SHIFT_START_SB 1 /*!< lowest subband of source range */ 135 136 typedef enum 137 { 138 INVF_OFF = 0, 139 INVF_LOW_LEVEL, 140 INVF_MID_LEVEL, 141 INVF_HIGH_LEVEL, 142 INVF_SWITCHED /* not a real choice but used here to control behaviour */ 143 } 144 INVF_MODE; 145 146 147 /** parameter set for one single patch */ 148 typedef struct { 149 UCHAR sourceStartBand; /*!< first band in lowbands where to take the samples from */ 150 UCHAR sourceStopBand; /*!< first band in lowbands which is not included in the patch anymore */ 151 UCHAR guardStartBand; /*!< first band in highbands to be filled with zeros in order to 152 reduce interferences between patches */ 153 UCHAR targetStartBand; /*!< first band in highbands to be filled with whitened lowband signal */ 154 UCHAR targetBandOffs; /*!< difference between 'startTargetBand' and 'startSourceBand' */ 155 UCHAR numBandsInPatch; /*!< number of consecutive bands in this one patch */ 156 } PATCH_PARAM; 157 158 159 /** whitening factors for different levels of whitening 160 need to be initialized corresponding to crossover frequency */ 161 typedef struct { 162 FIXP_DBL off; /*!< bw factor for signal OFF */ 163 FIXP_DBL transitionLevel; 164 FIXP_DBL lowLevel; /*!< bw factor for signal LOW_LEVEL */ 165 FIXP_DBL midLevel; /*!< bw factor for signal MID_LEVEL */ 166 FIXP_DBL highLevel; /*!< bw factor for signal HIGH_LEVEL */ 167 } WHITENING_FACTORS; 168 169 170 /*! The transposer settings are calculated on a header reset and are shared by both channels. */ 171 typedef struct { 172 UCHAR nCols; /*!< number subsamples of a codec frame */ 173 UCHAR noOfPatches; /*!< number of patches */ 174 UCHAR lbStartPatching; /*!< first band of lowbands that will be patched */ 175 UCHAR lbStopPatching; /*!< first band that won't be patched anymore*/ 176 UCHAR bwBorders[MAX_NUM_NOISE_VALUES]; /*!< spectral bands with different inverse filtering levels */ 177 178 PATCH_PARAM patchParam[MAX_NUM_PATCHES]; /*!< new parameter set for patching */ 179 WHITENING_FACTORS whFactors; /*!< the pole moving factors for certain whitening levels as indicated 180 in the bitstream depending on the crossover frequency */ 181 UCHAR overlap; /*!< Overlap size */ 182 } TRANSPOSER_SETTINGS; 183 184 185 typedef struct 186 { 187 TRANSPOSER_SETTINGS *pSettings; /*!< Common settings for both channels */ 188 FIXP_DBL bwVectorOld[MAX_NUM_PATCHES]; /*!< pole moving factors of past frame */ 189 FIXP_DBL lpcFilterStatesReal[LPC_ORDER][(32)]; /*!< pointer array to save filter states */ 190 FIXP_DBL lpcFilterStatesImag[LPC_ORDER][(32)]; /*!< pointer array to save filter states */ 191 } 192 SBR_LPP_TRANS; 193 194 typedef SBR_LPP_TRANS *HANDLE_SBR_LPP_TRANS; 195 196 197 void lppTransposer (HANDLE_SBR_LPP_TRANS hLppTrans, 198 QMF_SCALE_FACTOR *sbrScaleFactor, 199 FIXP_DBL **qmfBufferReal, 200 201 FIXP_DBL *degreeAlias, 202 FIXP_DBL **qmfBufferImag, 203 const int useLP, 204 const int timeStep, 205 const int firstSlotOffset, 206 const int lastSlotOffset, 207 const int nInvfBands, 208 INVF_MODE *sbr_invf_mode, 209 INVF_MODE *sbr_invf_mode_prev 210 ); 211 212 213 SBR_ERROR 214 createLppTransposer (HANDLE_SBR_LPP_TRANS hLppTrans, 215 TRANSPOSER_SETTINGS *pSettings, 216 const int highBandStartSb, 217 UCHAR *v_k_master, 218 const int numMaster, 219 const int usb, 220 const int timeSlots, 221 const int nCols, 222 UCHAR *noiseBandTable, 223 const int noNoiseBands, 224 UINT fs, 225 const int chan, 226 const int overlap); 227 228 229 SBR_ERROR 230 resetLppTransposer (HANDLE_SBR_LPP_TRANS hLppTrans, 231 UCHAR highBandStartSb, 232 UCHAR *v_k_master, 233 UCHAR numMaster, 234 UCHAR *noiseBandTable, 235 UCHAR noNoiseBands, 236 UCHAR usb, 237 UINT fs); 238 239 240 241 #endif /* _LPP_TRANS_H */ 242 243
