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 Noise floor estimation structs and prototypes 87 */ 88 89 #ifndef __NF_EST_H 90 #define __NF_EST_H 91 92 #include "sbr_encoder.h" 93 #include "fram_gen.h" 94 95 #define NF_SMOOTHING_LENGTH 4 /*!< Smoothing length of the noise floors. */ 96 97 typedef struct 98 { 99 FIXP_DBL prevNoiseLevels[NF_SMOOTHING_LENGTH][MAX_NUM_NOISE_VALUES]; /*!< The previous noise levels. */ 100 FIXP_DBL noiseFloorOffset[MAX_NUM_NOISE_VALUES]; /*!< Noise floor offset, scaled with NOISE_FLOOR_OFFSET_SCALING */ 101 const FIXP_DBL *smoothFilter; /*!< Smoothing filter to use. */ 102 FIXP_DBL ana_max_level; /*!< Max level allowed. */ 103 FIXP_DBL weightFac; /*!< Weightening factor for the difference between orig and sbr. */ 104 INT freqBandTableQmf[MAX_NUM_NOISE_VALUES + 1]; /*!< Frequncy band table for the noise floor bands.*/ 105 INT noNoiseBands; /*!< Number of noisebands. */ 106 INT noiseBands; /*!< NoiseBands switch 4 bit.*/ 107 INT timeSlots; /*!< Number of timeslots in a frame. */ 108 INVF_MODE diffThres; /*!< Threshold value to control the inverse filtering decision */ 109 } 110 SBR_NOISE_FLOOR_ESTIMATE; 111 112 typedef SBR_NOISE_FLOOR_ESTIMATE *HANDLE_SBR_NOISE_FLOOR_ESTIMATE; 113 114 void 115 FDKsbrEnc_sbrNoiseFloorEstimateQmf(HANDLE_SBR_NOISE_FLOOR_ESTIMATE h_sbrNoiseFloorEstimate, /*!< Handle to SBR_NOISE_FLOOR_ESTIMATE struct */ 116 const SBR_FRAME_INFO *frame_info, /*!< Time frequency grid of the current frame. */ 117 FIXP_DBL *noiseLevels, /*!< Pointer to vector to store the noise levels in.*/ 118 FIXP_DBL **quotaMatrixOrig, /*!< Matrix holding the quota values of the original. */ 119 SCHAR* indexVector, /*!< Index vector to obtain the patched data. */ 120 INT missingHarmonicsFlag, /*!< Flag indicating if a strong tonal component will be missing. */ 121 INT startIndex, /*!< Start index. */ 122 int numberOfEstimatesPerFrame, /*!< The number of tonality estimates per frame. */ 123 INT transientFrame, /*!< A flag indicating if a transient is present. */ 124 INVF_MODE* pInvFiltLevels, /*!< Pointer to the vector holding the inverse filtering levels. */ 125 UINT sbrSyntaxFlags 126 ); 127 128 INT 129 FDKsbrEnc_InitSbrNoiseFloorEstimate (HANDLE_SBR_NOISE_FLOOR_ESTIMATE h_sbrNoiseFloorEstimate, /*!< Handle to SBR_NOISE_FLOOR_ESTIMATE struct */ 130 INT ana_max_level, /*!< Maximum level of the adaptive noise. */ 131 const UCHAR *freqBandTable, /*!< Frequany band table. */ 132 INT nSfb, /*!< Number of frequency bands. */ 133 INT noiseBands, /*!< Number of noise bands per octave. */ 134 INT noiseFloorOffset, /*!< Noise floor offset. */ 135 INT timeSlots, /*!< Number of time slots in a frame. */ 136 UINT useSpeechConfig /*!< Flag: adapt tuning parameters according to speech */ 137 ); 138 139 INT 140 FDKsbrEnc_resetSbrNoiseFloorEstimate (HANDLE_SBR_NOISE_FLOOR_ESTIMATE h_sbrNoiseFloorEstimate, /*!< Handle to SBR_NOISE_FLOOR_ESTIMATE struct */ 141 const UCHAR *freqBandTable, /*!< Frequany band table. */ 142 INT nSfb); /*!< Number of bands in the frequency band table. */ 143 144 void 145 FDKsbrEnc_deleteSbrNoiseFloorEstimate (HANDLE_SBR_NOISE_FLOOR_ESTIMATE h_sbrNoiseFloorEstimate); /*!< Handle to SBR_NOISE_FLOOR_ESTIMATE struct */ 146 147 #endif 148
