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 /**************************** AAC decoder library ****************************** 96 97 Author(s): Matthias Hildenbrand, Manuel Jander 98 99 Description: USAC LPC/AVQ decode 100 101 *******************************************************************************/ 102 103 #ifndef USACDEC_LPC_H 104 #define USACDEC_LPC_H 105 106 #include "channelinfo.h" 107 #include "common_fix.h" 108 #include "FDK_bitstream.h" 109 #include "usacdec_rom.h" 110 111 #define LSPARG_SCALE 10 112 113 /** 114 * \brief AVQ (refinement) decode 115 * \param hBs bitstream handle 116 * \param lsfq buffer for AVQ decode output. 117 * \param nk_mode quantization mode. 118 * \param nqn amount of split/interleaved RE8 vectors. 119 * \param total amount of individual data values to decode. 120 * \return 0 on success, -1 on error. 121 */ 122 int CLpc_DecodeAVQ(HANDLE_FDK_BITSTREAM hBs, FIXP_DBL *lsfq, int nk_mode, 123 int nqn, int length); 124 125 /** 126 * \brief Read and decode LPC coeficient sets. First stage approximation + AVQ 127 * decode. 128 * \param[in] hBs bitstream handle to read data from. 129 * \param[out] lsp buffer into which the decoded LSP coefficients will be stored 130 * into. 131 * \param[in,out] lpc4_lsf buffer into which the decoded LCP4 LSF coefficients 132 * will be stored into (persistent). 133 * \param[out] lsf_adaptive_mean_cand lsf adaptive mean vector needed for 134 * concealment. 135 * \param[out] pStability array with stability values for the ACELP decoder (and 136 * concealment). 137 * \param[in] mod array which defines modes (ACELP, TCX20|40|80) are used in 138 * the current superframe. 139 * \param[in] first_lpd_flag indicates the presence of LPC0 140 * \param[in] last_lpc_lost indicate that LPC4 of previous frame was lost. 141 * \param[in] last_frame_ok indicate that the last frame was ok. 142 * \return 0 on success, -1 on error. 143 */ 144 int CLpc_Read(HANDLE_FDK_BITSTREAM hBs, FIXP_LPC lsp[][M_LP_FILTER_ORDER], 145 FIXP_LPC lpc4_lsf[M_LP_FILTER_ORDER], 146 FIXP_LPC lsf_adaptive_mean_cand[M_LP_FILTER_ORDER], 147 FIXP_SGL pStability[], UCHAR *mod, int first_lpd_flag, 148 int last_lpc_lost, int last_frame_ok); 149 150 /** 151 * \brief Generate LPC coefficient sets in case frame loss. 152 * \param lsp buffer into which the decoded LSP coefficients will be stored 153 * into. 154 * \param lpc4_lsf buffer into which the decoded LCP4 LSF coefficients will be 155 * stored into (persistent). 156 * \param isf_adaptive_mean 157 * \param first_lpd_flag indicates the previous LSF4 coefficients lpc4_lsf[] are 158 * not valid. 159 */ 160 void CLpc_Conceal(FIXP_LPC lsp[][M_LP_FILTER_ORDER], 161 FIXP_LPC lpc4_lsf[M_LP_FILTER_ORDER], 162 FIXP_LPC isf_adaptive_mean[M_LP_FILTER_ORDER], 163 const int first_lpd_flag); 164 165 /** 166 * \brief apply absolute weighting 167 * \param A weighted LPC coefficient vector output. The first coeffcient is 168 * implicitly 1.0 169 * \param A LPC coefficient vector. The first coeffcient is implicitly 1.0 170 * \param m length of vector A 171 */ 172 /* static */ 173 void E_LPC_a_weight(FIXP_LPC *wA, const FIXP_LPC *A, const int m); 174 175 /** 176 * \brief decode TCX/FAC gain. In case of TCX the lg/sqrt(rms) part 177 * must still be applied to obtain the gain value. 178 * \param gain (o) pointer were the gain mantissa is stored into. 179 * \param gain_e (o) pointer were the gain exponent is stored into. 180 * \param gain_code (i) the 7 bit binary word from the bitstream 181 * representing the gain. 182 */ 183 void CLpd_DecodeGain(FIXP_DBL *gain, INT *gain_e, int gain_code); 184 185 /** 186 * \brief convert LSP coefficients into LP domain. 187 */ 188 void E_LPC_f_lsp_a_conversion(FIXP_LPC *lsp, FIXP_LPC *a, INT *a_exp); 189 190 #endif /* USACDEC_LPC_H */ 191