1 2 /* ----------------------------------------------------------------------------------------------------------- 3 Software 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 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@iis.fraunhofer.de 82 ----------------------------------------------------------------------------------------------------------- */ 83 84 #ifndef __RESAMPLER_H 85 #define __RESAMPLER_H 86 /*! 87 \file 88 \brief Fixed Point Resampler Tool Box 89 */ 90 91 #include "common_fix.h" 92 93 94 /**************************************************************************/ 95 /* BIQUAD Filter Structure */ 96 /**************************************************************************/ 97 98 #define MAXNR_SECTIONS (15) 99 100 #ifdef RS_BIQUAD_STATES16 101 typedef FIXP_SGL FIXP_BQS; 102 #else 103 typedef FIXP_DBL FIXP_BQS; 104 #endif 105 106 typedef struct 107 { 108 FIXP_BQS states[MAXNR_SECTIONS+1][2]; /*! state buffer */ 109 const FIXP_SGL *coeffa; /*! pointer to filter coeffs */ 110 FIXP_DBL gain; /*! overall gain factor */ 111 int Wc; /*! normalized cutoff freq * 1000 */ 112 int noCoeffs; /*! number of filter coeffs sets */ 113 int ptr; /*! index to rinbuffers */ 114 } LP_FILTER; 115 116 117 /**************************************************************************/ 118 /* Downsampler Structure */ 119 /**************************************************************************/ 120 121 typedef struct 122 { 123 LP_FILTER downFilter; /*! filter instance */ 124 int ratio; /*! downsampling ration */ 125 int delay; /*! downsampling delay (source fs) */ 126 int pending; /*! number of pending output samples */ 127 } DOWNSAMPLER; 128 129 130 /** 131 * \brief Initialized a given downsampler structure. 132 */ 133 INT FDKaacEnc_InitDownsampler(DOWNSAMPLER *DownSampler, /*!< pointer to downsampler instance */ 134 INT Wc, /*!< normalized cutoff freq * 1000 */ 135 INT ratio); /*!< downsampler ratio */ 136 137 /** 138 * \brief Downsample a set of audio samples. numInSamples must be at least equal to the 139 * downsampler ratio. 140 */ 141 INT FDKaacEnc_Downsample(DOWNSAMPLER *DownSampler, /*!< pointer to downsampler instance */ 142 INT_PCM *inSamples, /*!< pointer to input samples */ 143 INT numInSamples, /*!< number of input samples */ 144 INT inStride, /*!< increment of input samples */ 145 INT_PCM *outSamples, /*!< pointer to output samples */ 146 INT *numOutSamples, /*!< pointer tp number of output samples */ 147 INT outstride); /*!< increment of output samples */ 148 149 150 151 #endif /* __RESAMPLER_H */ 152