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 /******************************** MPEG Audio Encoder ************************** 85 86 author: M. Werner 87 contents/description: Convert chaos measure to the tonality index 88 89 ******************************************************************************/ 90 91 #include "tonality.h" 92 #include "chaosmeasure.h" 93 94 static const FIXP_DBL normlog = (FIXP_DBL)0xd977d949; /*FL2FXCONST_DBL(-0.4342944819f * FDKlog(2.0)/FDKlog(2.7182818)); */ 95 96 static void FDKaacEnc_CalcSfbTonality(FIXP_DBL *RESTRICT spectrum, 97 INT *RESTRICT sfbMaxScaleSpec, 98 FIXP_DBL *RESTRICT chaosMeasure, 99 FIXP_SGL *RESTRICT sfbTonality, 100 INT sfbCnt, 101 const INT *RESTRICT sfbOffset, 102 FIXP_DBL *RESTRICT sfbEnergyLD64 ); 103 104 105 void FDKaacEnc_CalculateFullTonality(FIXP_DBL *RESTRICT spectrum, 106 INT *RESTRICT sfbMaxScaleSpec, 107 FIXP_DBL *RESTRICT sfbEnergyLD64, 108 FIXP_SGL *RESTRICT sfbTonality, 109 INT sfbCnt, 110 const INT *sfbOffset, 111 INT usePns) 112 { 113 INT j; 114 #if defined(ARCH_PREFER_MULT_32x16) 115 FIXP_SGL alpha_0 = FL2FXCONST_SGL(0.25f); /* used in smooth ChaosMeasure */ 116 FIXP_SGL alpha_1 = FL2FXCONST_SGL(1.0f-0.25f); /* used in smooth ChaosMeasure */ 117 #else 118 FIXP_DBL alpha_0 = FL2FXCONST_DBL(0.25f); /* used in smooth ChaosMeasure */ 119 FIXP_DBL alpha_1 = FL2FXCONST_DBL(1.0f-0.25f); /* used in smooth ChaosMeasure */ 120 #endif 121 INT numberOfLines = sfbOffset[sfbCnt]; 122 123 if (!usePns) 124 return; 125 126 C_ALLOC_SCRATCH_START(chaosMeasurePerLine, FIXP_DBL, (1024)); 127 /* calculate chaos measure */ 128 FDKaacEnc_CalculateChaosMeasure(spectrum, 129 numberOfLines, 130 chaosMeasurePerLine); 131 132 /* smooth ChaosMeasure */ 133 for (j=1;j<numberOfLines;j++) { 134 FIXP_DBL tmp = fMultDiv2(alpha_1, chaosMeasurePerLine[j]); 135 chaosMeasurePerLine[j] = fMultAdd(tmp, alpha_0, chaosMeasurePerLine[j-1]); 136 } 137 138 FDKaacEnc_CalcSfbTonality(spectrum, 139 sfbMaxScaleSpec, 140 chaosMeasurePerLine, 141 sfbTonality, 142 sfbCnt, 143 sfbOffset, 144 sfbEnergyLD64); 145 146 C_ALLOC_SCRATCH_END(chaosMeasurePerLine, FIXP_DBL, (1024)); 147 } 148 149 150 /***************************************************************************** 151 152 functionname: CalculateTonalityIndex 153 description: computes tonality values out of unpredictability values 154 limits range and computes log() 155 returns: 156 input: ptr to energies, ptr to chaos measure values, 157 number of sfb 158 output: sfb wise tonality values 159 160 *****************************************************************************/ 161 static void FDKaacEnc_CalcSfbTonality(FIXP_DBL *RESTRICT spectrum, 162 INT *RESTRICT sfbMaxScaleSpec, 163 FIXP_DBL *RESTRICT chaosMeasure, 164 FIXP_SGL *RESTRICT sfbTonality, 165 INT sfbCnt, 166 const INT *RESTRICT sfbOffset, 167 FIXP_DBL *RESTRICT sfbEnergyLD64 ) 168 { 169 INT i, j; 170 171 for (i=0; i<sfbCnt; i++) { 172 FIXP_DBL chaosMeasureSfbLD64; 173 INT shiftBits = fixMax(0,sfbMaxScaleSpec[i] - 4); /* max sfbWidth = 96 ; 2^7=128 => 7/2 = 4 (spc*spc) */ 174 175 FIXP_DBL chaosMeasureSfb = FL2FXCONST_DBL(0.0); 176 177 /* calc chaosMeasurePerSfb */ 178 for (j=(sfbOffset[i+1]-sfbOffset[i])-1; j>=0; j--) { 179 FIXP_DBL tmp = (*spectrum++)<<shiftBits; 180 FIXP_DBL lineNrg = fMultDiv2(tmp, tmp); 181 chaosMeasureSfb = fMultAddDiv2(chaosMeasureSfb, lineNrg, *chaosMeasure++); 182 } 183 184 /* calc tonalityPerSfb */ 185 if (chaosMeasureSfb != FL2FXCONST_DBL(0.0)) 186 { 187 /* add ld(convtone)/64 and 2/64 bec.fMultDiv2 */ 188 chaosMeasureSfbLD64 = CalcLdData((chaosMeasureSfb)) - sfbEnergyLD64[i]; 189 chaosMeasureSfbLD64 += FL2FXCONST_DBL(3.0f/64) - ((FIXP_DBL)(shiftBits)<<(DFRACT_BITS-6)); 190 191 if (chaosMeasureSfbLD64 > FL2FXCONST_DBL(-0.0519051) ) /* > ld(0.05)+ld(2) */ 192 { 193 if (chaosMeasureSfbLD64 <= FL2FXCONST_DBL(0.0) ) 194 sfbTonality[i] = FX_DBL2FX_SGL(fMultDiv2( chaosMeasureSfbLD64 , normlog ) << 7); 195 else 196 sfbTonality[i] = FL2FXCONST_SGL(0.0); 197 } 198 else 199 sfbTonality[i] = (FIXP_SGL)MAXVAL_SGL; 200 } 201 else 202 sfbTonality[i] = (FIXP_SGL)MAXVAL_SGL; 203 } 204 } 205
