1 2/* ----------------------------------------------------------------------------------------------------------- 3Software License for The Fraunhofer FDK AAC Codec Library for Android 4 5� Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur F�rderung der angewandten Forschung e.V. 6 All rights reserved. 7 8 1. INTRODUCTION 9The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements 10the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio. 11This FDK AAC Codec software is intended to be used on a wide variety of Android devices. 12 13AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual 14audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by 15independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part 16of the MPEG specifications. 17 18Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer) 19may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners 20individually for the purpose of encoding or decoding bit streams in products that are compliant with 21the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license 22these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec 23software may already be covered under those patent licenses when it is used for those licensed purposes only. 24 25Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality, 26are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional 27applications information and documentation. 28 292. COPYRIGHT LICENSE 30 31Redistribution and use in source and binary forms, with or without modification, are permitted without 32payment of copyright license fees provided that you satisfy the following conditions: 33 34You must retain the complete text of this software license in redistributions of the FDK AAC Codec or 35your modifications thereto in source code form. 36 37You must retain the complete text of this software license in the documentation and/or other materials 38provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form. 39You must make available free of charge copies of the complete source code of the FDK AAC Codec and your 40modifications thereto to recipients of copies in binary form. 41 42The name of Fraunhofer may not be used to endorse or promote products derived from this library without 43prior written permission. 44 45You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec 46software or your modifications thereto. 47 48Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software 49and 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." 52 533. NO PATENT LICENSE 54 55NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer, 56ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with 57respect to this software. 58 59You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized 60by appropriate patent licenses. 61 624. DISCLAIMER 63 64This 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 66of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 67CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages, 68including but not limited to procurement of substitute goods or services; loss of use, data, or profits, 69or business interruption, however caused and on any theory of liability, whether in contract, strict 70liability, or tort (including negligence), arising in any way out of the use of this software, even if 71advised of the possibility of such damage. 72 735. CONTACT INFORMATION 74 75Fraunhofer Institute for Integrated Circuits IIS 76Attention: Audio and Multimedia Departments - FDK AAC LL 77Am Wolfsmantel 33 7891058 Erlangen, Germany 79 80www.iis.fraunhofer.de/amm 81amm-info@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 97typedef 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} 110SBR_NOISE_FLOOR_ESTIMATE; 111 112typedef SBR_NOISE_FLOOR_ESTIMATE *HANDLE_SBR_NOISE_FLOOR_ESTIMATE; 113 114void 115FDKsbrEnc_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 128INT 129FDKsbrEnc_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 139INT 140FDKsbrEnc_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 144void 145FDKsbrEnc_deleteSbrNoiseFloorEstimate (HANDLE_SBR_NOISE_FLOOR_ESTIMATE h_sbrNoiseFloorEstimate); /*!< Handle to SBR_NOISE_FLOOR_ESTIMATE struct */ 146 147#endif 148