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): 87 Description: dit_fft ARM assembler replacements. 88 89 ******************************************************************************/ 90 91 /* NEON optimized FFT currently builds only with RVCT toolchain */ 92 93 #ifndef FUNCTION_dit_fft 94 95 /* If dit_fft was not yet defined by ARM-Cortex ... */ 96 97 #if defined(SINETABLE_16BIT) 98 99 #define FUNCTION_dit_fft 100 101 /***************************************************************************** 102 103 date: 28.07.2005 srl 104 105 Contents/description: dit-tukey-FFT-algorithm 106 107 ******************************************************************************/ 108 109 #if defined(FUNCTION_dit_fft) 110 111 112 void dit_fft(FIXP_DBL *x, const INT ldn, const FIXP_STP *trigdata, const INT trigDataSize) 113 { 114 const INT n=1<<ldn; 115 INT i; 116 117 scramble(x,n); 118 /* 119 * 1+2 stage radix 4 120 */ 121 122 for (i=0;i<n*2;i+=8) 123 { 124 FIXP_DBL a00, a10, a20, a30; 125 a00 = (x[i + 0] + x[i + 2])>>1; /* Re A + Re B */ 126 a10 = (x[i + 4] + x[i + 6])>>1; /* Re C + Re D */ 127 a20 = (x[i + 1] + x[i + 3])>>1; /* Im A + Im B */ 128 a30 = (x[i + 5] + x[i + 7])>>1; /* Im C + Im D */ 129 130 x[i + 0] = a00 + a10; /* Re A' = Re A + Re B + Re C + Re D */ 131 x[i + 4] = a00 - a10; /* Re C' = Re A + Re B - Re C - Re D */ 132 x[i + 1] = a20 + a30; /* Im A' = Im A + Im B + Im C + Im D */ 133 x[i + 5] = a20 - a30; /* Im C' = Im A + Im B - Im C - Im D */ 134 135 a00 = a00 - x[i + 2]; /* Re A - Re B */ 136 a10 = a10 - x[i + 6]; /* Re C - Re D */ 137 a20 = a20 - x[i + 3]; /* Im A - Im B */ 138 a30 = a30 - x[i + 7]; /* Im C - Im D */ 139 140 x[i + 2] = a00 + a30; /* Re B' = Re A - Re B + Im C - Im D */ 141 x[i + 6] = a00 - a30; /* Re D' = Re A - Re B - Im C + Im D */ 142 x[i + 3] = a20 - a10; /* Im B' = Im A - Im B - Re C + Re D */ 143 x[i + 7] = a20 + a10; /* Im D' = Im A - Im B + Re C - Re D */ 144 } 145 146 INT mh = 1 << 1; 147 INT ldm = ldn - 2; 148 INT trigstep = trigDataSize; 149 150 do 151 { 152 const FIXP_STP *pTrigData = trigdata; 153 INT j; 154 155 mh <<= 1; 156 trigstep >>= 1; 157 158 FDK_ASSERT(trigstep > 0); 159 160 /* Do first iteration with c=1.0 and s=0.0 separately to avoid loosing to much precision. 161 Beware: The impact on the overal FFT precision is rather large. */ 162 { 163 FIXP_DBL *xt1 = x; 164 int r = n; 165 166 do { 167 FIXP_DBL *xt2 = xt1 + (mh<<1); 168 /* 169 FIXP_DBL *xt1 = x+ ((r)<<1); 170 FIXP_DBL *xt2 = xt1 + (mh<<1); 171 */ 172 FIXP_DBL vr,vi,ur,ui; 173 174 //cplxMultDiv2(&vi, &vr, x[t2+1], x[t2], (FIXP_SGL)1.0, (FIXP_SGL)0.0); 175 vi = xt2[1]>>1; 176 vr = xt2[0]>>1; 177 178 ur = xt1[0]>>1; 179 ui = xt1[1]>>1; 180 181 xt1[0] = ur+vr; 182 xt1[1] = ui+vi; 183 184 xt2[0] = ur-vr; 185 xt2[1] = ui-vi; 186 187 xt1 += mh; 188 xt2 += mh; 189 190 //cplxMultDiv2(&vr, &vi, x[t2+1], x[t2], (FIXP_SGL)1.0, (FIXP_SGL)0.0); 191 vr = xt2[1]>>1; 192 vi = xt2[0]>>1; 193 194 ur = xt1[0]>>1; 195 ui = xt1[1]>>1; 196 197 xt1[0] = ur+vr; 198 xt1[1] = ui-vi; 199 200 xt2[0] = ur-vr; 201 xt2[1] = ui+vi; 202 203 xt1 = xt2 + mh; 204 } while ((r=r-(mh<<1)) != 0); 205 } 206 for(j=4; j<mh; j+=4) 207 { 208 FIXP_DBL *xt1 = x + (j>>1); 209 FIXP_SPK cs; 210 int r = n; 211 212 pTrigData += trigstep; 213 cs = *pTrigData; 214 215 do 216 { 217 FIXP_DBL *xt2 = xt1 + (mh<<1); 218 FIXP_DBL vr,vi,ur,ui; 219 220 cplxMultDiv2(&vi, &vr, xt2[1], xt2[0], cs); 221 222 ur = xt1[0]>>1; 223 ui = xt1[1]>>1; 224 225 xt1[0] = ur+vr; 226 xt1[1] = ui+vi; 227 228 xt2[0] = ur-vr; 229 xt2[1] = ui-vi; 230 231 xt1 += mh; 232 xt2 += mh; 233 234 cplxMultDiv2(&vr, &vi, xt2[1], xt2[0], cs); 235 236 ur = xt1[0]>>1; 237 ui = xt1[1]>>1; 238 239 xt1[0] = ur+vr; 240 xt1[1] = ui-vi; 241 242 xt2[0] = ur-vr; 243 xt2[1] = ui+vi; 244 245 /* Same as above but for t1,t2 with j>mh/4 and thus cs swapped */ 246 xt1 = xt1 - (j); 247 xt2 = xt1 + (mh<<1); 248 249 cplxMultDiv2(&vi, &vr, xt2[0], xt2[1], cs); 250 251 ur = xt1[0]>>1; 252 ui = xt1[1]>>1; 253 254 xt1[0] = ur+vr; 255 xt1[1] = ui-vi; 256 257 xt2[0] = ur-vr; 258 xt2[1] = ui+vi; 259 260 xt1 += mh; 261 xt2 += mh; 262 263 cplxMultDiv2(&vr, &vi, xt2[0], xt2[1], cs); 264 265 ur = xt1[0]>>1; 266 ui = xt1[1]>>1; 267 268 xt1[0] = ur-vr; 269 xt1[1] = ui-vi; 270 271 xt2[0] = ur+vr; 272 xt2[1] = ui+vi; 273 274 xt1 = xt2 + (j); 275 } while ((r=r-(mh<<1)) != 0); 276 } 277 { 278 FIXP_DBL *xt1 = x + (mh>>1); 279 int r = n; 280 281 do 282 { 283 FIXP_DBL *xt2 = xt1 + (mh<<1); 284 FIXP_DBL vr,vi,ur,ui; 285 286 cplxMultDiv2(&vi, &vr, xt2[1], xt2[0], STC(0x5a82799a), STC(0x5a82799a)); 287 288 ur = xt1[0]>>1; 289 ui = xt1[1]>>1; 290 291 xt1[0] = ur+vr; 292 xt1[1] = ui+vi; 293 294 xt2[0] = ur-vr; 295 xt2[1] = ui-vi; 296 297 xt1 += mh; 298 xt2 += mh; 299 300 cplxMultDiv2(&vr, &vi, xt2[1], xt2[0], STC(0x5a82799a), STC(0x5a82799a)); 301 302 ur = xt1[0]>>1; 303 ui = xt1[1]>>1; 304 305 xt1[0] = ur+vr; 306 xt1[1] = ui-vi; 307 308 xt2[0] = ur-vr; 309 xt2[1] = ui+vi; 310 311 xt1 = xt2 + mh; 312 } while ((r=r-(mh<<1)) != 0); 313 } 314 } while (--ldm != 0); 315 } 316 317 #endif /* if defined(FUNCTION_dit_fft) */ 318 319 #endif /* if defined(SINETABLE_16BIT) */ 320 321 #endif /* ifndef FUNCTION_dit_fft */ 322
