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 /*! 85 \file 86 \brief Defines structures for RVLC 87 \author Robert Weidner 88 */ 89 #ifndef RVLC_INFO_H 90 #define RVLC_INFO_H 91 92 93 94 #define FWD 0 /* bitstream decoding direction forward (RVL coded part) */ 95 #define BWD 1 /* bitstream decoding direction backward (RVL coded part) */ 96 97 #define MAX_RVL 7 /* positive RVLC escape */ 98 #define MIN_RVL -7 /* negative RVLC escape */ 99 #define MAX_ALLOWED_DPCM_INDEX 14 /* the maximum allowed index of a decoded dpcm value (offset 'TABLE_OFFSET' incl --> must be subtracted) */ 100 #define TABLE_OFFSET 7 /* dpcm offset of valid output values of rvl table decoding, the rvl table ouly returns positive values, therefore the offset */ 101 #define MAX_LEN_RVLC_CODE_WORD 9 /* max length of a RVL codeword in bits */ 102 #define MAX_LEN_RVLC_ESCAPE_WORD 20 /* max length of huffman coded RVLC escape word in bits */ 103 104 #define DPCM_NOISE_NRG_BITS 9 105 #define SF_OFFSET 100 /* offset for correcting scf value */ 106 107 #define CONCEAL_MAX_INIT 1311 /* arbitrary value */ 108 #define CONCEAL_MIN_INIT -1311 /* arbitrary value */ 109 110 #define RVLC_MAX_SFB ((8) * (16)) 111 112 /* sideinfo of RVLC */ 113 typedef struct 114 { 115 /* ------- ESC 1 Data: --------- */ /* order of RVLC-bitstream components in bitstream (RVLC-initialization), every component appears only once in bitstream */ 116 INT sf_concealment; /* 1 */ 117 INT rev_global_gain; /* 2 */ 118 SHORT length_of_rvlc_sf; /* 3 */ /* original value, gets modified (subtract 9) in case of noise (PNS); is kept for later use */ 119 INT dpcm_noise_nrg; /* 4 optional */ 120 INT sf_escapes_present; /* 5 */ 121 SHORT length_of_rvlc_escapes; /* 6 optional */ 122 INT dpcm_noise_last_position; /* 7 optional */ 123 124 INT dpcm_is_last_position; 125 126 SHORT length_of_rvlc_sf_fwd; /* length_of_rvlc_sf used for forward decoding */ 127 SHORT length_of_rvlc_sf_bwd; /* length_of_rvlc_sf used for backward decoding */ 128 129 /* for RVL-Codeword decoder to distinguish between fwd and bwd decoding */ 130 SHORT *pRvlBitCnt_RVL; 131 USHORT *pBitstrIndxRvl_RVL; 132 133 UCHAR numWindowGroups; 134 UCHAR maxSfbTransmitted; 135 UCHAR first_noise_group; 136 UCHAR first_noise_band; 137 UCHAR direction; 138 139 /* bitstream indices */ 140 USHORT bitstreamIndexRvlFwd; /* base address of RVL-coded-scalefactor data (ESC 2) for forward decoding */ 141 USHORT bitstreamIndexRvlBwd; /* base address of RVL-coded-scalefactor data (ESC 2) for backward decoding */ 142 USHORT bitstreamIndexEsc; /* base address where RVLC-escapes start (ESC 2) */ 143 144 /* decoding trees */ 145 const UINT *pHuffTreeRvlCodewds; 146 const UINT *pHuffTreeRvlcEscape; 147 148 /* escape counters */ 149 UCHAR numDecodedEscapeWordsFwd; /* when decoding RVL-codes forward */ 150 UCHAR numDecodedEscapeWordsBwd; /* when decoding RVL-codes backward */ 151 UCHAR numDecodedEscapeWordsEsc; /* when decoding the escape-Words */ 152 153 SCHAR noise_used; 154 SCHAR intensity_used; 155 SCHAR sf_used; 156 157 SHORT firstScf; 158 SHORT lastScf; 159 SHORT firstNrg; 160 SHORT lastNrg; 161 SHORT firstIs; 162 SHORT lastIs; 163 164 /* ------ RVLC error detection ------ */ 165 UINT errorLogRvlc; /* store RVLC errors */ 166 SHORT conceal_min; /* is set at backward decoding */ 167 SHORT conceal_max; /* is set at forward decoding */ 168 SHORT conceal_min_esc; /* is set at backward decoding */ 169 SHORT conceal_max_esc; /* is set at forward decoding */ 170 } CErRvlcInfo; 171 172 typedef CErRvlcInfo RVLC_INFO; /* temp */ 173 174 175 176 #endif /* RVLC_INFO_H */ 177
