1 /* ----------------------------------------------------------------------------- 2 Software License for The Fraunhofer FDK AAC Codec Library for Android 3 4 © Copyright 1995 - 2023 Fraunhofer-Gesellschaft zur Förderung 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@iis.fraunhofer.de 93 ----------------------------------------------------------------------------- */ 94 95 /**************************** AAC decoder library ****************************** 96 97 Author(s): Christian Griebel 98 99 Description: Dynamic range control (DRC) global data types 100 101 *******************************************************************************/ 102 103 #ifndef AACDEC_DRC_TYPES_H 104 #define AACDEC_DRC_TYPES_H 105 106 #include "common_fix.h" 107 108 #define MAX_DRC_THREADS \ 109 ((8) + 1) /* Heavy compression value is handled just like MPEG DRC data */ 110 #define MAX_DRC_BANDS (16) /* 2^LEN_DRC_BAND_INCR (LEN_DRC_BAND_INCR = 4) */ 111 112 /** 113 * \brief DRC module global data types 114 */ 115 typedef enum { 116 UNKNOWN_PAYLOAD = 0, 117 MPEG_DRC_EXT_DATA = 1, 118 DVB_DRC_ANC_DATA = 2 119 120 } AACDEC_DRC_PAYLOAD_TYPE; 121 122 /** 123 * \brief Options for parameter handling / presentation mode 124 */ 125 typedef enum { 126 DISABLED_PARAMETER_HANDLING = -1, /*!< DRC parameter handling disabled, all 127 parameters are applied as requested. */ 128 ENABLED_PARAMETER_HANDLING = 129 0, /*!< Apply changes to requested DRC parameters to prevent clipping */ 130 DRC_PRESENTATION_MODE_1 = 1, /*!< DRC Presentation mode 1*/ 131 DRC_PRESENTATION_MODE_2 = 2 /*!< DRC Presentation mode 2*/ 132 133 } AACDEC_DRC_PARAMETER_HANDLING; 134 135 typedef struct { 136 UINT expiryCount; 137 UINT numBands; 138 USHORT bandTop[MAX_DRC_BANDS]; 139 SHORT drcInterpolationScheme; 140 UCHAR drcValue[MAX_DRC_BANDS]; 141 SCHAR drcDataType; 142 143 } CDrcChannelData; 144 145 typedef struct { 146 UINT excludedChnsMask; 147 SCHAR progRefLevel; 148 SCHAR presMode; /* Presentation mode: 0 (not indicated), 1, 2, and 3 149 (reserved). */ 150 SCHAR pceInstanceTag; 151 152 CDrcChannelData channelData; 153 154 } CDrcPayload; 155 156 typedef struct { 157 /* DRC parameters: Latest user requests */ 158 FIXP_DBL usrCut; 159 FIXP_DBL usrBoost; 160 UCHAR usrApplyHeavyCompression; 161 162 /* DRC parameters: Currently used, possibly changed by 163 * aacDecoder_drcParameterHandling */ 164 FIXP_DBL cut; /* attenuation scale factor */ 165 FIXP_DBL boost; /* boost scale factor */ 166 SCHAR targetRefLevel; /* target reference level for loudness normalization */ 167 UCHAR applyHeavyCompression; /* heavy compression (DVB) flag */ 168 169 UINT expiryFrame; 170 UCHAR bsDelayEnable; 171 172 AACDEC_DRC_PARAMETER_HANDLING defaultPresentationMode; 173 UCHAR encoderTargetLevel; 174 175 } CDrcParams; 176 177 typedef struct { 178 CDrcParams 179 params; /* Module parameters that can be set by user (via SetParam API 180 function) */ 181 182 UCHAR enable; /* Switch that controls dynamic range processing */ 183 UCHAR digitalNorm; /* Switch to en-/disable reference level normalization in 184 digital domain */ 185 186 UCHAR update; /* Flag indicating the change of a user or bitstream parameter 187 which affects aacDecoder_drcParameterHandling */ 188 INT numOutChannels; /* Number of output channels */ 189 INT prevAacNumChannels; /* Previous number of channels of aac bitstream, used 190 for update flag */ 191 192 USHORT numPayloads; /* The number of DRC data payload elements found within 193 frame */ 194 USHORT 195 numThreads; /* The number of DRC data threads extracted from the found 196 payload elements */ 197 SCHAR progRefLevel; /* Program reference level for all channels */ 198 UCHAR progRefLevelPresent; /* Program reference level found in bitstream */ 199 200 UINT prlExpiryCount; /* Counter that can be used to monitor the life time of 201 the program reference level. */ 202 203 SCHAR presMode; /* Presentation mode as defined in ETSI TS 101 154 */ 204 UCHAR dvbAncDataAvailable; /* Flag that indicates whether DVB ancillary data 205 is present or not */ 206 UINT dvbAncDataPosition; /* Used to store the DVB ancillary data payload 207 position in the bitstream (only one per frame) */ 208 UINT drcPayloadPosition[MAX_DRC_THREADS]; /* Used to store the DRC payload 209 positions in the bitstream */ 210 UCHAR applyExtGain; /* Flag is 1 if extGain has to be applied, otherwise 0. */ 211 212 FIXP_DBL additionalGainPrev; /* Gain of previous frame to be applied to the 213 time data */ 214 FIXP_DBL additionalGainFilterState; /* Filter state for the gain smoothing */ 215 FIXP_DBL additionalGainFilterState1; /* Filter state for the gain smoothing */ 216 217 } CDrcInfo; 218 219 typedef CDrcInfo *HANDLE_AAC_DRC; 220 221 #endif /* AACDEC_DRC_TYPES_H */ 222