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 /**************************** AAC decoder library ****************************** 96 97 Author(s): 98 99 Description: 100 101 *******************************************************************************/ 102 103 /*! 104 \file 105 \brief Defines structures for RVLC 106 \author Robert Weidner 107 */ 108 #ifndef RVLC_INFO_H 109 #define RVLC_INFO_H 110 111 #define FWD 0 /* bitstream decoding direction forward (RVL coded part) */ 112 #define BWD 1 /* bitstream decoding direction backward (RVL coded part) */ 113 114 #define MAX_RVL 7 /* positive RVLC escape */ 115 #define MIN_RVL -7 /* negative RVLC escape */ 116 #define MAX_ALLOWED_DPCM_INDEX \ 117 14 /* the maximum allowed index of a decoded dpcm value (offset \ 118 'TABLE_OFFSET' incl --> must be subtracted) */ 119 #define TABLE_OFFSET \ 120 7 /* dpcm offset of valid output values of rvl table decoding, the rvl table \ 121 ouly returns positive values, therefore the offset */ 122 #define MAX_LEN_RVLC_CODE_WORD 9 /* max length of a RVL codeword in bits */ 123 #define MAX_LEN_RVLC_ESCAPE_WORD \ 124 20 /* max length of huffman coded RVLC escape word in bits */ 125 126 #define DPCM_NOISE_NRG_BITS 9 127 #define SF_OFFSET 100 /* offset for correcting scf value */ 128 129 #define CONCEAL_MAX_INIT 1311 /* arbitrary value */ 130 #define CONCEAL_MIN_INIT -1311 /* arbitrary value */ 131 132 #define RVLC_MAX_SFB ((8) * (16)) 133 134 /* sideinfo of RVLC */ 135 typedef struct { 136 /* ------- ESC 1 Data: --------- */ /* order of RVLC-bitstream components in 137 bitstream (RVLC-initialization), every 138 component appears only once in 139 bitstream */ 140 INT sf_concealment; /* 1 */ 141 INT rev_global_gain; /* 2 */ 142 SHORT length_of_rvlc_sf; /* 3 */ /* original value, gets modified 143 (subtract 9) in case of noise 144 (PNS); is kept for later use */ 145 INT dpcm_noise_nrg; /* 4 optional */ 146 INT sf_escapes_present; /* 5 */ 147 SHORT length_of_rvlc_escapes; /* 6 optional */ 148 INT dpcm_noise_last_position; /* 7 optional */ 149 150 INT dpcm_is_last_position; 151 152 SHORT length_of_rvlc_sf_fwd; /* length_of_rvlc_sf used for forward decoding */ 153 SHORT 154 length_of_rvlc_sf_bwd; /* length_of_rvlc_sf used for backward decoding */ 155 156 /* for RVL-Codeword decoder to distinguish between fwd and bwd decoding */ 157 SHORT *pRvlBitCnt_RVL; 158 INT *pBitstrIndxRvl_RVL; 159 160 UCHAR numWindowGroups; 161 UCHAR maxSfbTransmitted; 162 UCHAR first_noise_group; 163 UCHAR first_noise_band; 164 UCHAR direction; 165 166 /* bitstream indices */ 167 INT bsAnchor; /* hcr bit buffer reference index */ 168 INT bitstreamIndexRvlFwd; /* base address of RVL-coded-scalefactor data (ESC 169 2) for forward decoding */ 170 INT bitstreamIndexRvlBwd; /* base address of RVL-coded-scalefactor data (ESC 171 2) for backward decoding */ 172 INT bitstreamIndexEsc; /* base address where RVLC-escapes start (ESC 2) */ 173 174 /* decoding trees */ 175 const UINT *pHuffTreeRvlCodewds; 176 const UINT *pHuffTreeRvlcEscape; 177 178 /* escape counters */ 179 UCHAR numDecodedEscapeWordsFwd; /* when decoding RVL-codes forward */ 180 UCHAR numDecodedEscapeWordsBwd; /* when decoding RVL-codes backward */ 181 UCHAR numDecodedEscapeWordsEsc; /* when decoding the escape-Words */ 182 183 SCHAR noise_used; 184 SCHAR intensity_used; 185 SCHAR sf_used; 186 187 SHORT firstScf; 188 SHORT lastScf; 189 SHORT firstNrg; 190 SHORT lastNrg; 191 SHORT firstIs; 192 SHORT lastIs; 193 194 /* ------ RVLC error detection ------ */ 195 UINT errorLogRvlc; /* store RVLC errors */ 196 SHORT conceal_min; /* is set at backward decoding */ 197 SHORT conceal_max; /* is set at forward decoding */ 198 SHORT conceal_min_esc; /* is set at backward decoding */ 199 SHORT conceal_max_esc; /* is set at forward decoding */ 200 } CErRvlcInfo; 201 202 typedef CErRvlcInfo RVLC_INFO; /* temp */ 203 204 #endif /* RVLC_INFO_H */ 205
