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 /*************************** Fraunhofer IIS FDK Tools ********************** 85 86 Author(s): Haricharan Lakshman, Manuel Jander 87 Description: Trigonometric functions fixed point fractional implementation. 88 89 ******************************************************************************/ 90 91 92 93 #include "common_fix.h" 94 95 #include "FDK_tools_rom.h" 96 97 /* Fixed point precision definitions */ 98 #define Q(format) ((FIXP_DBL)(((LONG)1) << (format))) 99 100 #ifndef M_PI 101 #define M_PI (3.14159265358979323846f) 102 #endif 103 104 /*! 105 * Inverse tangent function. 106 */ 107 108 // --- fixp_atan() ---- 109 #define Q_ATANINP (25) // Input in q25, Output in q30 110 #define Q_ATANOUT (30) 111 #define ATI_SF ((DFRACT_BITS-1)-Q_ATANINP) // 6 112 #define ATI_SCALE ((float)(1<<ATI_SF)) // 113 #define ATO_SF ((DFRACT_BITS-1)-Q_ATANOUT) // 1 ] -pi/2 .. pi/2 [ 114 #define ATO_SCALE ((float)(1<<ATO_SF)) // 115 // --- fixp_atan2() --- 116 #define Q_ATAN2OUT (29) 117 #define AT2O_SF ((DFRACT_BITS-1)-Q_ATAN2OUT) // 2 ] -pi .. pi ] 118 #define AT2O_SCALE ((float)(1<<AT2O_SF)) // 119 // -------------------- 120 121 FIXP_DBL fixp_atan(FIXP_DBL x); 122 FIXP_DBL fixp_atan2(FIXP_DBL y, FIXP_DBL x); 123 124 FIXP_DBL fixp_cos(FIXP_DBL x, int scale); 125 FIXP_DBL fixp_sin(FIXP_DBL x, int scale); 126 127 #define FIXP_COS_SIN 128 129 130 #include "FDK_tools_rom.h" 131 132 #define SINETAB SineTable512 133 #define LD 9 134 135 136 #ifndef FUNCTION_inline_fixp_cos_sin 137 138 #define FUNCTION_inline_fixp_cos_sin 139 140 /* 141 * Calculates coarse lookup index and sign for sine. 142 * Returns delta x residual. 143 */ 144 static inline FIXP_DBL fixp_sin_cos_residual_inline(FIXP_DBL x, int scale, FIXP_DBL *sine, FIXP_DBL *cosine) 145 { 146 FIXP_DBL residual; 147 int s; 148 int shift = (31-scale-LD-1); 149 int ssign = 1; 150 int csign = 1; 151 152 residual = fMult(x, FL2FXCONST_DBL(1.0/M_PI)); 153 s = ((LONG)residual) >> shift; 154 155 residual &= ( (1<<shift) - 1 ); 156 residual = fMult(residual, FL2FXCONST_DBL(M_PI/4.0)) << 2; 157 residual <<= scale; 158 159 /* Sine sign symmetry */ 160 if (s & ((1<<LD)<<1) ) { 161 ssign = -ssign; 162 } 163 /* Cosine sign symmetry */ 164 if ( (s + (1<<LD)) & ((1<<LD)<<1) ) { 165 csign = -csign; 166 } 167 168 s = fAbs(s); 169 170 s &= (((1<<LD)<<1)-1); /* Modulo PI */ 171 172 if (s > (1<<LD)) { 173 s = ((1<<LD)<<1) - s; 174 } 175 176 { 177 LONG sl, cl; 178 /* Because of packed table */ 179 if (s > (1<<(LD-1))) { 180 FIXP_STP tmp; 181 /* Cosine/Sine simetry for angles greater than PI/4 */ 182 s = (1<<LD)-s; 183 tmp = SINETAB[s]; 184 sl = (LONG)tmp.v.re; 185 cl = (LONG)tmp.v.im; 186 } else { 187 FIXP_STP tmp; 188 tmp = SINETAB[s]; 189 sl = (LONG)tmp.v.im; 190 cl = (LONG)tmp.v.re; 191 } 192 193 #ifdef SINETABLE_16BIT 194 *sine = (FIXP_DBL)((sl * ssign) << (DFRACT_BITS-FRACT_BITS)); 195 *cosine = (FIXP_DBL)((cl * csign) << (DFRACT_BITS-FRACT_BITS)); 196 #else 197 *sine = (FIXP_DBL)(sl * ssign); 198 *cosine = (FIXP_DBL)(cl * csign); 199 #endif 200 } 201 202 return residual; 203 } 204 205 /** 206 * \brief Calculate cosine and sine value each of 2 angles different angle values. 207 * \param x1 first angle value 208 * \param x2 second angle value 209 * \param scale exponent of x1 and x2 210 * \param out pointer to 4 FIXP_DBL locations, were the values cos(x1), sin(x1), cos(x2), sin(x2) 211 * will be stored into. 212 */ 213 static inline void inline_fixp_cos_sin (FIXP_DBL x1, FIXP_DBL x2, const int scale, FIXP_DBL *out) 214 { 215 FIXP_DBL residual, error0, error1, sine, cosine; 216 residual = fixp_sin_cos_residual_inline(x1, scale, &sine, &cosine); 217 error0 = fMultDiv2(sine, residual); 218 error1 = fMultDiv2(cosine, residual); 219 *out++ = cosine - (error0<<1); 220 *out++ = sine + (error1<<1); 221 222 residual = fixp_sin_cos_residual_inline(x2, scale, &sine, &cosine); 223 error0 = fMultDiv2(sine, residual); 224 error1 = fMultDiv2(cosine, residual); 225 *out++ = cosine - (error0<<1); 226 *out++ = sine + (error1<<1); 227 } 228 #endif 229 230
