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 /**************************** SBR encoder library ****************************** 96 97 Author(s): 98 99 Description: 100 101 *******************************************************************************/ 102 103 /*! 104 \file 105 \brief Noise floor estimation structs and prototypes $Revision: 92790 $ 106 */ 107 108 #ifndef NF_EST_H 109 #define NF_EST_H 110 111 #include "sbr_encoder.h" 112 #include "fram_gen.h" 113 114 #define NF_SMOOTHING_LENGTH 4 /*!< Smoothing length of the noise floors. */ 115 116 typedef struct { 117 FIXP_DBL 118 prevNoiseLevels[NF_SMOOTHING_LENGTH] 119 [MAX_NUM_NOISE_VALUES]; /*!< The previous noise levels. */ 120 FIXP_DBL noiseFloorOffset 121 [MAX_NUM_NOISE_VALUES]; /*!< Noise floor offset, scaled with 122 NOISE_FLOOR_OFFSET_SCALING */ 123 const FIXP_DBL *smoothFilter; /*!< Smoothing filter to use. */ 124 FIXP_DBL ana_max_level; /*!< Max level allowed. */ 125 FIXP_DBL weightFac; /*!< Weightening factor for the difference between orig 126 and sbr. */ 127 INT freqBandTableQmf[MAX_NUM_NOISE_VALUES + 128 1]; /*!< Frequncy band table for the noise floor bands.*/ 129 INT noNoiseBands; /*!< Number of noisebands. */ 130 INT noiseBands; /*!< NoiseBands switch 4 bit.*/ 131 INT timeSlots; /*!< Number of timeslots in a frame. */ 132 INVF_MODE diffThres; /*!< Threshold value to control the inverse filtering 133 decision */ 134 } SBR_NOISE_FLOOR_ESTIMATE; 135 136 typedef SBR_NOISE_FLOOR_ESTIMATE *HANDLE_SBR_NOISE_FLOOR_ESTIMATE; 137 138 void FDKsbrEnc_sbrNoiseFloorEstimateQmf( 139 HANDLE_SBR_NOISE_FLOOR_ESTIMATE 140 h_sbrNoiseFloorEstimate, /*!< Handle to SBR_NOISE_FLOOR_ESTIMATE struct 141 */ 142 const SBR_FRAME_INFO 143 *frame_info, /*!< Time frequency grid of the current frame. */ 144 FIXP_DBL 145 *noiseLevels, /*!< Pointer to vector to store the noise levels in.*/ 146 FIXP_DBL **quotaMatrixOrig, /*!< Matrix holding the quota values of the 147 original. */ 148 SCHAR *indexVector, /*!< Index vector to obtain the patched data. */ 149 INT missingHarmonicsFlag, /*!< Flag indicating if a strong tonal component 150 will be missing. */ 151 INT startIndex, /*!< Start index. */ 152 UINT numberOfEstimatesPerFrame, /*!< The number of tonality estimates per 153 frame. */ 154 INT transientFrame, /*!< A flag indicating if a transient is present. */ 155 INVF_MODE *pInvFiltLevels, /*!< Pointer to the vector holding the inverse 156 filtering levels. */ 157 UINT sbrSyntaxFlags); 158 159 INT FDKsbrEnc_InitSbrNoiseFloorEstimate( 160 HANDLE_SBR_NOISE_FLOOR_ESTIMATE 161 h_sbrNoiseFloorEstimate, /*!< Handle to SBR_NOISE_FLOOR_ESTIMATE struct 162 */ 163 INT ana_max_level, /*!< Maximum level of the adaptive noise. */ 164 const UCHAR *freqBandTable, /*!< Frequany band table. */ 165 INT nSfb, /*!< Number of frequency bands. */ 166 INT noiseBands, /*!< Number of noise bands per octave. */ 167 INT noiseFloorOffset, /*!< Noise floor offset. */ 168 INT timeSlots, /*!< Number of time slots in a frame. */ 169 UINT useSpeechConfig /*!< Flag: adapt tuning parameters according to speech 170 */ 171 ); 172 173 INT FDKsbrEnc_resetSbrNoiseFloorEstimate( 174 HANDLE_SBR_NOISE_FLOOR_ESTIMATE 175 h_sbrNoiseFloorEstimate, /*!< Handle to SBR_NOISE_FLOOR_ESTIMATE struct 176 */ 177 const UCHAR *freqBandTable, /*!< Frequany band table. */ 178 INT nSfb); /*!< Number of bands in the frequency band table. */ 179 180 void FDKsbrEnc_deleteSbrNoiseFloorEstimate( 181 HANDLE_SBR_NOISE_FLOOR_ESTIMATE 182 h_sbrNoiseFloorEstimate); /*!< Handle to SBR_NOISE_FLOOR_ESTIMATE struct 183 */ 184 185 #endif 186
