1 2 /* ----------------------------------------------------------------------------------------------------------- 3 Software License for The Fraunhofer FDK AAC Codec Library for Android 4 5 Copyright 1995 - 2012 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 Envelope calculation prototypes 87 */ 88 #ifndef __ENV_CALC_H 89 #define __ENV_CALC_H 90 91 #include "sbrdecoder.h" 92 #include "env_extr.h" /* for HANDLE_SBR_HEADER_DATA */ 93 #include "sbr_scale.h" 94 95 96 typedef struct 97 { 98 FIXP_DBL filtBuffer[MAX_FREQ_COEFFS]; /*!< previous gains (required for smoothing) */ 99 FIXP_DBL filtBufferNoise[MAX_FREQ_COEFFS]; /*!< previous noise levels (required for smoothing) */ 100 SCHAR filtBuffer_e[MAX_FREQ_COEFFS]; /*!< Exponents of previous gains */ 101 SCHAR filtBufferNoise_e; /*!< Common exponent of previous noise levels */ 102 103 int startUp; /*!< flag to signal initial conditions in buffers */ 104 int phaseIndex; /*!< Index for randomPase array */ 105 int prevTranEnv; /*!< The transient envelope of the previous frame. */ 106 107 int harmFlagsPrev[(MAX_FREQ_COEFFS+15)/16]; 108 /*!< Words with 16 flags each indicating where a sine was added in the previous frame.*/ 109 UCHAR harmIndex; /*!< Current phase of synthetic sine */ 110 111 } 112 SBR_CALCULATE_ENVELOPE; 113 114 typedef SBR_CALCULATE_ENVELOPE *HANDLE_SBR_CALCULATE_ENVELOPE; 115 116 117 118 void 119 calculateSbrEnvelope (QMF_SCALE_FACTOR *sbrScaleFactor, 120 HANDLE_SBR_CALCULATE_ENVELOPE h_sbr_cal_env, 121 HANDLE_SBR_HEADER_DATA hHeaderData, 122 HANDLE_SBR_FRAME_DATA hFrameData, 123 FIXP_DBL **analysBufferReal, 124 FIXP_DBL **analysBufferImag, /*!< Imag part of subband samples to be processed */ 125 const int useLP, 126 FIXP_DBL *degreeAlias, /*!< Estimated aliasing for each QMF channel */ 127 const UINT flags, 128 const int frameErrorFlag 129 ); 130 131 SBR_ERROR 132 createSbrEnvelopeCalc (HANDLE_SBR_CALCULATE_ENVELOPE hSbrCalculateEnvelope, 133 HANDLE_SBR_HEADER_DATA hHeaderData, 134 const int chan, 135 const UINT flags); 136 137 int 138 deleteSbrEnvelopeCalc (HANDLE_SBR_CALCULATE_ENVELOPE hSbrCalculateEnvelope); 139 140 void 141 resetSbrEnvelopeCalc (HANDLE_SBR_CALCULATE_ENVELOPE hCalEnv); 142 143 SBR_ERROR 144 ResetLimiterBands ( UCHAR *limiterBandTable, 145 UCHAR *noLimiterBands, 146 UCHAR *freqBandTable, 147 int noFreqBands, 148 const PATCH_PARAM *patchParam, 149 int noPatches, 150 int limiterBands); 151 152 void rescaleSubbandSamples( FIXP_DBL ** re, 153 FIXP_DBL ** im, 154 int lowSubband, int noSubbands, 155 int start_pos, int next_pos, 156 int shift); 157 158 FIXP_DBL maxSubbandSample( FIXP_DBL ** analysBufferReal_m, 159 FIXP_DBL ** analysBufferImag_m, 160 int lowSubband, 161 int highSubband, 162 int start_pos, 163 int stop_pos); 164 165 #endif // __ENV_CALC_H 166
