1 /* ----------------------------------------------------------------------------- 2 Software License for The Fraunhofer FDK AAC Codec Library for Android 3 4 © Copyright 1995 - 2018 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 /*********************** MPEG surround decoder library ************************* 96 97 Author(s): 98 99 Description: SAC Processing 100 101 *******************************************************************************/ 102 103 /*! 104 \file 105 \brief Polyphase Filterbank 106 */ 107 108 #ifndef SAC_PROCESS_H 109 #define SAC_PROCESS_H 110 111 #include "sac_dec.h" 112 113 void SpatialDecApplyPhase(spatialDec *self, FIXP_SGL alpha, 114 int lastSlotOfParamSet); 115 116 /** 117 * \brief Apply QMF Analysis Filterbank. 118 * 119 * Calculates qmf data on downmix input time data. 120 * Delaylines will be applied if necessaray. 121 * 122 * \param self A spatial decoder handle. 123 * \param inData Downmix channel time data as input. 124 * \param ts Signals time slot offset for input buffer. 125 * \param qmfReal Downmix channel qmf output data. 126 * \param qmfImag Downmix channel qmf output data. 127 * 128 * \return Error status. 129 */ 130 SACDEC_ERROR SpatialDecQMFAnalysis(spatialDec *self, const PCM_MPS *inData, 131 const INT ts, const INT bypassMode, 132 FIXP_DBL **qmfReal, FIXP_DBL **qmfImag, 133 const int numInputChannels); 134 135 /** 136 * \brief Feed spatial decoder with external qmf data. 137 * 138 * \param self A spatial decoder handle. 139 * \param qmfInDataReal External qmf downmix data as input. 140 * \param qmfInDataImag External qmf downmix data as input. 141 * \param ts Signals time slot in input buffer to process. 142 * \param qmfReal Downmix channel qmf output data. 143 * \param qmfImag Downmix channel qmf output data. 144 * \param numInputChannels Number of input channels. Might differ from 145 * self->numInputChannels. 146 * 147 * \return Error status. 148 */ 149 SACDEC_ERROR SpatialDecFeedQMF(spatialDec *self, FIXP_DBL **qmfInDataReal, 150 FIXP_DBL **qmfInDataImag, const INT ts, 151 const INT bypassMode, FIXP_DBL **qmfReal, 152 FIXP_DBL **qmfImag, const INT numInputChannels); 153 154 /** 155 * \brief Apply Hybrdid Analysis Filterbank. 156 * 157 * Calculates hybrid data on downmix input data. 158 * Residual hybrid signals will also be calculated on current slot if available. 159 * 160 * \param self A spatial decoder handle. 161 * \param qmfInputReal Downmix channel qmf data as input. 162 * \param qmfInputImag Downmix channel qmf data as input. 163 * \param hybOutputReal Downmix channel hybrid output data. 164 * \param hybOutputImag Downmix channel hybrid output data. 165 * \param ts Signals time slot in spatial frame to process. 166 * \param numInputChannels Number of input channels. Might differ from 167 * self->numInputChannels. 168 * 169 * \return Error status. 170 */ 171 SACDEC_ERROR SpatialDecHybridAnalysis(spatialDec *self, FIXP_DBL **qmfInputReal, 172 FIXP_DBL **qmfInputImag, 173 FIXP_DBL **hybOutputReal, 174 FIXP_DBL **hybOutputImag, const INT ts, 175 const INT numInputChannels); 176 177 /** 178 * \brief Create X data. 179 * 180 * Returns a pointer list over Xchannels pointing to downmix input channels 181 * and to residual channels when provided. 182 * 183 * \param self A spatial decoder handle. 184 * \param hybInputReal Downmix channel hybrid data as input. 185 * \param hybInputImag Downmix channel hybrid data as input. 186 * \param pxReal Pointer to hybrid and residual data as output. 187 * \param pxImag Pointer to hybrid and residual data as output. 188 * 189 * \return Error status. 190 */ 191 SACDEC_ERROR SpatialDecCreateX(spatialDec *self, FIXP_DBL **hybInputReal, 192 FIXP_DBL **hybInputImag, FIXP_DBL **pxReal, 193 FIXP_DBL **pxImag); 194 195 /** 196 * \brief MPS212 combined version of apply M1 parameters and create wet signal 197 * 198 * \param self A spatial decoder handle. 199 * \param xReal Downmix and residual X data as input. 200 * \param xImag Downmix and residual X data as input. 201 * \param vReal output data: [0] direct signal (V); [1] wet signal 202 * (W). 203 * \param vImag output data: [0] direct signal (V); [1] wet signal 204 * (W). 205 * 206 * \return Error status. 207 */ 208 SACDEC_ERROR SpatialDecApplyM1_CreateW_Mode212( 209 spatialDec *self, const SPATIAL_BS_FRAME *frame, FIXP_DBL **xReal, 210 FIXP_DBL **xImag, FIXP_DBL **vReal, FIXP_DBL **vImag); 211 212 /** 213 * \brief Apply M2 parameters. 214 * 215 * \param self A spatial decoder handle. 216 * \param ps Signals parameter band from where M2 parameter to 217 * use. 218 * \param alpha Smoothing factor between current and previous 219 * parameter band. Rangeability between 0.f and 1.f. 220 * \param wReal Wet input data. 221 * \param wImag Wet input data. 222 * \param hybOutputRealDry Dry output data. 223 * \param hybOutputImagDry Dry output data. 224 * \param hybOutputRealWet Wet output data. 225 * \param hybOutputImagWet Wet output data. 226 * 227 * \return Error status. 228 */ 229 SACDEC_ERROR SpatialDecApplyM2(spatialDec *self, INT ps, const FIXP_SGL alpha, 230 FIXP_DBL **wReal, FIXP_DBL **wImag, 231 FIXP_DBL **hybOutputRealDry, 232 FIXP_DBL **hybOutputImagDry, 233 FIXP_DBL **hybOutputRealWet, 234 FIXP_DBL **hybOutputImagWet); 235 236 /** 237 * \brief Apply M2 parameter for 212 mode with residualCoding and phaseCoding. 238 * 239 * \param self [i] A spatial decoder handle. 240 * \param ps [i] Signals parameter band from where M2 parameter 241 * to use. 242 * \param alpha [i] Smoothing factor between current and previous 243 * parameter band. Rangeability between 0.f and 1.f. 244 * \param wReal [i] Wet input data. 245 * \param wImag [i] Wet input data. 246 * \param hybOutputRealDry [o] Dry output data. 247 * \param hybOutputImagDry [o] Dry output data. 248 * 249 * \return error 250 */ 251 SACDEC_ERROR SpatialDecApplyM2_Mode212_ResidualsPlusPhaseCoding( 252 spatialDec *self, INT ps, const FIXP_SGL alpha, FIXP_DBL **wReal, 253 FIXP_DBL **wImag, FIXP_DBL **hybOutputRealDry, FIXP_DBL **hybOutputImagDry); 254 255 /** 256 * \brief Apply M2 parameter for 212 mode, upmix from mono to stereo. 257 * 258 * \param self [i] A spatial decoder handle. 259 * \param ps [i] Signals parameter band from where M2 parameter 260 * to use. 261 * \param alpha [i] Smoothing factor between current and previous 262 * parameter band. Rangeability between 0.f and 1.f. 263 * \param wReal [i] Wet input data. 264 * \param wImag [i] Wet input data. 265 * \param hybOutputRealDry [o] Dry output data. 266 * \param hybOutputImagDry [o] Dry output data. 267 * 268 * \return error 269 */ 270 SACDEC_ERROR SpatialDecApplyM2_Mode212(spatialDec *self, INT ps, 271 const FIXP_SGL alpha, FIXP_DBL **wReal, 272 FIXP_DBL **wImag, 273 FIXP_DBL **hybOutputRealDry, 274 FIXP_DBL **hybOutputImagDry); 275 276 /** 277 * \brief Convert Hybrid input to output audio data. 278 * 279 * \param hSpaceSynthesisQmf A spatial decoder handle. 280 * \param ts Signals time slot in spatial frame to process. 281 * \param hybOutputReal Hybrid data as input. 282 * \param hybOutputImag Hybrid data as input. 283 * \param timeOut audio output data. 284 * 285 * \return Error status. 286 */ 287 SACDEC_ERROR SpatialDecSynthesis(spatialDec *self, const INT ts, 288 FIXP_DBL **hybOutputReal, 289 FIXP_DBL **hybOutputImag, PCM_MPS *timeOut, 290 const INT numInputChannels, 291 const FDK_channelMapDescr *const mapDescr); 292 293 void SpatialDecBufferMatrices(spatialDec *self); 294 295 FIXP_DBL getChGain(spatialDec *self, UINT ch, INT *scale); 296 297 #endif 298