1 /* ----------------------------------------------------------------------------- 2 Software License for The Fraunhofer FDK AAC Codec Library for Android 3 4 Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Frderung 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 (at) iis.fraunhofer.de 93 ----------------------------------------------------------------------------- */ 94 95 /*********************** MPEG surround decoder library ************************* 96 97 Author(s): Matthias Hildenbrand 98 99 Description: USAC MPS212 Transient Steering Decorrelator (TSD) 100 101 *******************************************************************************/ 102 103 #ifndef SAC_TSD_H 104 #define SAC_TSD_H 105 106 #include "FDK_bitstream.h" 107 #include "common_fix.h" 108 109 #define MAX_TSD_TIME_SLOTS (64) 110 111 /** Structure which holds the data needed to apply TSD to current frame. */ 112 typedef struct { 113 UCHAR bsTsdEnable; /**< for current frame TSD is (0:disabled, 1:enabled) */ 114 UCHAR numSlots; /**< total number of QMF slots per frame */ 115 SCHAR 116 bsTsdTrPhaseData[MAX_TSD_TIME_SLOTS]; /**< -1 => TsdSepData[ts]=0; 0-7: 117 values of bsTsdTrPhaseData[ts] 118 and TsdSepData[ts]=1 */ 119 } TSD_DATA; 120 121 FDK_INLINE int isTsdActive(const TSD_DATA *pTsdData) { 122 return (int)pTsdData->bsTsdEnable; 123 } 124 125 /** 126 * \brief Parse and Decode TSD data. 127 * \param[in] hBs bitstream handle to read data from. 128 * \param[in] numSlots number of QMF slots per frame. 129 * \param[out] pTsdData pointer to TSD data structure. 130 * \return 0 on succes, 1 on error. 131 */ 132 int TsdRead(HANDLE_FDK_BITSTREAM hBs, const int numSlots, TSD_DATA *pTsdData); 133 134 /** 135 * \brief Perform transient seperation (v_{x,nonTr} signal). 136 * \param[in] numHybridBands number of hybrid bands. 137 * \param[in] pTsdData pointer to TSD data structure. 138 * \param[in] pVdirectReal pointer to array with direct signal. 139 * \param[in] pVdirectImag pointer to array with direct signal. 140 * \param[out] pVnonTrReal pointer to array with nonTr signal. 141 * \param[out] pVnonTrImag pointer to array with nonTr signal. 142 * \param[out] ppDecorrInReal handle to array where allpass based decorrelator 143 * should read from (modified by this function). 144 * \param[out] ppDecorrInImag handle to array where allpass based decorrelator 145 * should read from (modified by this function). 146 */ 147 void TsdGenerateNonTr(const int numHybridBands, const TSD_DATA *pTsdData, 148 const int ts, FIXP_DBL *pVdirectReal, 149 FIXP_DBL *pVdirectImag, FIXP_DBL *pVnonTrReal, 150 FIXP_DBL *pVnonTrImag, FIXP_DBL **ppDecorrInReal, 151 FIXP_DBL **ppDecorrInImag); 152 153 /** 154 * \brief Generate d_{x,Tr} signal and add to d_{x,nonTr} signal 155 * \param[in] numHybridBands 156 * \param[in,out] pTsdData 157 * \param pTsdTs pointer to persistent time slot counter 158 * \param[in] pVdirectReal 159 * \param[in] pVdirectImag 160 * \param[out] pDnonTrReal 161 * \param[out] pDnonTrImag 162 */ 163 void TsdApply(const int numHybridBands, const TSD_DATA *pTsdData, int *pTsdTs, 164 const FIXP_DBL *pVdirectReal, const FIXP_DBL *pVdirectImag, 165 FIXP_DBL *pDnonTrReal, FIXP_DBL *pDnonTrImag); 166 167 #endif /* #ifndef SAC_TSD_H */ 168
