1 2 /* ----------------------------------------------------------------------------------------------------------- 3 Software License for The Fraunhofer FDK AAC Codec Library for Android 4 5 Copyright 1995 - 2013 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 /*************************** Fraunhofer IIS FDK Tools ********************** 85 86 Author(s): Markus Lohwasser 87 Description: FDK Tools Hybrid Filterbank 88 89 ******************************************************************************/ 90 91 #ifndef __FDK_HYBRID_H 92 #define __FDK_HYBRID_H 93 94 95 96 #include "common_fix.h" 97 98 /*--------------- enums -------------------------------*/ 99 100 /** 101 * Hybrid Filterband modes. 102 */ 103 typedef enum { 104 THREE_TO_TEN, 105 THREE_TO_TWELVE, 106 THREE_TO_SIXTEEN 107 108 } FDK_HYBRID_MODE; 109 110 111 /*--------------- structure definitions ---------------*/ 112 typedef struct FDK_HYBRID_SETUP *HANDLE_FDK_HYBRID_SETUP; 113 114 typedef struct 115 { 116 FIXP_DBL *bufferLFReal[3]; /*!< LF real filter states. */ 117 FIXP_DBL *bufferLFImag[3]; /*!< LF imag filter states. */ 118 FIXP_DBL *bufferHFReal[13]; /*!< HF real delay lines. */ 119 FIXP_DBL *bufferHFImag[13]; /*!< HF imag delay lines. */ 120 121 INT bufferLFpos; /*!< Position to write incoming data into ringbuffer. */ 122 INT bufferHFpos; /*!< Delay line positioning. */ 123 INT nrBands; /*!< Number of QMF bands. */ 124 INT cplxBands; /*!< Number of complex QMF bands.*/ 125 UCHAR hfMode; /*!< Flag signalizes treatment of HF bands. */ 126 127 FIXP_DBL *pLFmemory; /*!< Pointer to LF states buffer. */ 128 FIXP_DBL *pHFmemory; /*!< Pointer to HF states buffer. */ 129 130 UINT LFmemorySize; /*!< Size of LF states buffer. */ 131 UINT HFmemorySize; /*!< Size of HF states buffer. */ 132 133 HANDLE_FDK_HYBRID_SETUP pSetup; /*!< Pointer to filter setup. */ 134 135 } FDK_ANA_HYB_FILTER; 136 137 138 typedef struct 139 { 140 INT nrBands; /*!< Number of QMF bands. */ 141 INT cplxBands; /*!< Number of complex QMF bands.*/ 142 143 HANDLE_FDK_HYBRID_SETUP pSetup; /*!< Pointer to filter setup. */ 144 145 } FDK_SYN_HYB_FILTER; 146 147 typedef FDK_ANA_HYB_FILTER *HANDLE_FDK_ANA_HYB_FILTER; 148 typedef FDK_SYN_HYB_FILTER *HANDLE_FDK_SYN_HYB_FILTER; 149 150 151 /** 152 * \brief Create one instance of Hybrid Analyis Filterbank. 153 * 154 * \param hAnalysisHybFilter Pointer to an outlying allocated Hybrid Analysis Filterbank structure. 155 * \param pLFmemory Pointer to outlying buffer used LF filtering. 156 * \param LFmemorySize Size of pLFmemory in bytes. 157 * \param pHFmemory Pointer to outlying buffer used HF delay line. 158 * \param HFmemorySize Size of pLFmemory in bytes. 159 * 160 * \return 0 on success. 161 */ 162 INT FDKhybridAnalysisOpen( 163 HANDLE_FDK_ANA_HYB_FILTER hAnalysisHybFilter, 164 FIXP_DBL *const pLFmemory, 165 const UINT LFmemorySize, 166 FIXP_DBL *const pHFmemory, 167 const UINT HFmemorySize 168 ); 169 170 171 /** 172 * \brief Initialize and configure Hybrdid Analysis Filterbank instance. 173 * 174 * \param hAnalysisHybFilter A Hybrid Analysis Filterbank handle. 175 * \param mode Select hybrid filter configuration. 176 * \param qmfBands Number of qmf bands to be processed. 177 * \param cplxBands Number of complex qmf bands to be processed. 178 * \param initStatesFlag Indicates whether the states buffer has to be cleared. 179 * 180 * \return 0 on success. 181 */ 182 INT FDKhybridAnalysisInit( 183 HANDLE_FDK_ANA_HYB_FILTER hAnalysisHybFilter, 184 const FDK_HYBRID_MODE mode, 185 const INT qmfBands, 186 const INT cplxBands, 187 const INT initStatesFlag 188 ); 189 190 191 /** 192 * \brief Adjust Hybrdid Analysis Filterbank states. 193 * 194 * \param hAnalysisHybFilter A Hybrid Analysis Filterbank handle. 195 * \param scalingValue Scaling value to be applied on filter states. 196 * 197 * \return 0 on success. 198 */ 199 INT FDKhybridAnalysisScaleStates( 200 HANDLE_FDK_ANA_HYB_FILTER hAnalysisHybFilter, 201 const INT scalingValue 202 ); 203 204 205 /** 206 * \brief Apply Hybrid Analysis Filterbank on Qmf input data. 207 * 208 * \param hAnalysisHybFilter A Hybrid Analysis Filterbank handle. 209 * \param pQmfReal Qmf input data. 210 * \param pQmfImag Qmf input data. 211 * \param pHybridReal Hybrid output data. 212 * \param pHybridImag Hybrid output data. 213 * 214 * \return 0 on success. 215 */ 216 INT FDKhybridAnalysisApply( 217 HANDLE_FDK_ANA_HYB_FILTER hAnalysisHybFilter, 218 const FIXP_DBL *const pQmfReal, 219 const FIXP_DBL *const pQmfImag, 220 FIXP_DBL *const pHybridReal, 221 FIXP_DBL *const pHybridImag 222 ); 223 224 225 /** 226 * \brief Close a Hybrid Analysis Filterbank instance. 227 * 228 * \param hAnalysisHybFilter Pointer to a Hybrid Analysis Filterbank instance. 229 * 230 * \return 0 on success. 231 */ 232 INT FDKhybridAnalysisClose( 233 HANDLE_FDK_ANA_HYB_FILTER hAnalysisHybFilter 234 ); 235 236 /** 237 * \brief Initialize and configure Hybrdid Synthesis Filterbank instance. 238 * 239 * \param hSynthesisHybFilter A Hybrid Synthesis Filterbank handle. 240 * \param mode Select hybrid filter configuration. 241 * \param qmfBands Number of qmf bands to be processed. 242 * \param cplxBands Number of complex qmf bands to be processed. 243 * 244 * \return 0 on success. 245 */ 246 INT FDKhybridSynthesisInit( 247 HANDLE_FDK_SYN_HYB_FILTER hSynthesisHybFilter, 248 const FDK_HYBRID_MODE mode, 249 const INT qmfBands, 250 const INT cplxBands 251 ); 252 253 /** 254 * \brief Apply Hybrid Analysis Filterbank on Hybrid data. 255 * 256 * \param hSynthesisHybFilter A Hybrid Analysis Filterbandk handle. 257 * \param pHybridReal Hybrid input data. 258 * \param pHybridImag Hybrid input data. 259 * \param pQmfReal Qmf output data. 260 * \param pQmfImag Qmf output data. 261 * 262 * \return 0 on success. 263 */ 264 INT FDKhybridSynthesisApply( 265 HANDLE_FDK_SYN_HYB_FILTER hSynthesisHybFilter, 266 const FIXP_DBL *const pHybridReal, 267 const FIXP_DBL *const pHybridImag, 268 FIXP_DBL *const pQmfReal, 269 FIXP_DBL *const pQmfImag 270 ); 271 272 273 #endif /* __FDK_HYBRID_H */ 274
