1 2/* ----------------------------------------------------------------------------------------------------------- 3Software License for The Fraunhofer FDK AAC Codec Library for Android 4 5© Copyright 1995 - 2012 Fraunhofer-Gesellschaft zur Förderung 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 Sbr miscellaneous helper functions 87*/ 88#include "sbr_misc.h" 89 90 91void FDKsbrEnc_Shellsort_fract (FIXP_DBL *in, INT n) 92{ 93 FIXP_DBL v; 94 INT i, j; 95 INT inc = 1; 96 97 do 98 inc = 3 * inc + 1; 99 while (inc <= n); 100 101 do { 102 inc = inc / 3; 103 for (i = inc + 1; i <= n; i++) { 104 v = in[i-1]; 105 j = i; 106 while (in[j-inc-1] > v) { 107 in[j-1] = in[j-inc-1]; 108 j -= inc; 109 if (j <= inc) 110 break; 111 } 112 in[j-1] = v; 113 } 114 } while (inc > 1); 115 116} 117 118/* Sorting routine */ 119void FDKsbrEnc_Shellsort_int (INT *in, INT n) 120{ 121 122 INT i, j, v; 123 INT inc = 1; 124 125 do 126 inc = 3 * inc + 1; 127 while (inc <= n); 128 129 do { 130 inc = inc / 3; 131 for (i = inc + 1; i <= n; i++) { 132 v = in[i-1]; 133 j = i; 134 while (in[j-inc-1] > v) { 135 in[j-1] = in[j-inc-1]; 136 j -= inc; 137 if (j <= inc) 138 break; 139 } 140 in[j-1] = v; 141 } 142 } while (inc > 1); 143 144} 145 146 147 148/******************************************************************************* 149 Functionname: FDKsbrEnc_AddVecLeft 150 ******************************************************************************* 151 152 Description: 153 154 Arguments: INT* dst, INT* length_dst, INT* src, INT length_src 155 156 Return: none 157 158*******************************************************************************/ 159void 160FDKsbrEnc_AddVecLeft (INT *dst, INT *length_dst, INT *src, INT length_src) 161{ 162 INT i; 163 164 for (i = length_src - 1; i >= 0; i--) 165 FDKsbrEnc_AddLeft (dst, length_dst, src[i]); 166} 167 168 169/******************************************************************************* 170 Functionname: FDKsbrEnc_AddLeft 171 ******************************************************************************* 172 173 Description: 174 175 Arguments: INT* vector, INT* length_vector, INT value 176 177 Return: none 178 179*******************************************************************************/ 180void 181FDKsbrEnc_AddLeft (INT *vector, INT *length_vector, INT value) 182{ 183 INT i; 184 185 for (i = *length_vector; i > 0; i--) 186 vector[i] = vector[i - 1]; 187 vector[0] = value; 188 (*length_vector)++; 189} 190 191 192/******************************************************************************* 193 Functionname: FDKsbrEnc_AddRight 194 ******************************************************************************* 195 196 Description: 197 198 Arguments: INT* vector, INT* length_vector, INT value 199 200 Return: none 201 202*******************************************************************************/ 203void 204FDKsbrEnc_AddRight (INT *vector, INT *length_vector, INT value) 205{ 206 vector[*length_vector] = value; 207 (*length_vector)++; 208} 209 210 211 212/******************************************************************************* 213 Functionname: FDKsbrEnc_AddVecRight 214 ******************************************************************************* 215 216 Description: 217 218 Arguments: INT* dst, INT* length_dst, INT* src, INT length_src) 219 220 Return: none 221 222*******************************************************************************/ 223void 224FDKsbrEnc_AddVecRight (INT *dst, INT *length_dst, INT *src, INT length_src) 225{ 226 INT i; 227 for (i = 0; i < length_src; i++) 228 FDKsbrEnc_AddRight (dst, length_dst, src[i]); 229} 230 231 232/***************************************************************************** 233 234 functionname: FDKsbrEnc_LSI_divide_scale_fract 235 236 description: Calculates division with best precision and scales the result. 237 238 return: num*scale/denom 239 240*****************************************************************************/ 241FIXP_DBL FDKsbrEnc_LSI_divide_scale_fract(FIXP_DBL num, FIXP_DBL denom, FIXP_DBL scale) 242{ 243 FIXP_DBL tmp = FL2FXCONST_DBL(0.0f); 244 if (num != FL2FXCONST_DBL(0.0f)) { 245 246 INT shiftCommon; 247 INT shiftNum = CountLeadingBits(num); 248 INT shiftDenom = CountLeadingBits(denom); 249 INT shiftScale = CountLeadingBits(scale); 250 251 num = num << shiftNum; 252 scale = scale << shiftScale; 253 254 tmp = fMultDiv2(num,scale); 255 256 if ( denom > (tmp >> fixMin(shiftNum+shiftScale-1,(DFRACT_BITS-1))) ) { 257 denom = denom << shiftDenom; 258 tmp = schur_div(tmp,denom,15); 259 shiftCommon = fixMin((shiftNum-shiftDenom+shiftScale-1),(DFRACT_BITS-1)); 260 if (shiftCommon < 0) 261 tmp <<= -shiftCommon; 262 else 263 tmp >>= shiftCommon; 264 } 265 else { 266 tmp = /*FL2FXCONST_DBL(1.0)*/ (FIXP_DBL)MAXVAL_DBL; 267 } 268 } 269 270 return (tmp); 271} 272 273