1 2 /* ----------------------------------------------------------------------------------------------------------- 3 Software License for The Fraunhofer FDK AAC Codec Library for Android 4 5 Copyright 1995 - 2012 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): M. Lohwasser 87 Description: auto-correlation functions 88 89 ******************************************************************************/ 90 91 #include "autocorr2nd.h" 92 93 94 95 /* If the accumulator does not provide enough overflow bits, 96 products have to be shifted down in the autocorrelation below. */ 97 #define SHIFT_FACTOR (5) 98 #define SHIFT >> (SHIFT_FACTOR) 99 100 101 #if defined(__CC_ARM) || defined(__arm__) 102 #include "arm/autocorr2nd.cpp" 103 #endif 104 105 106 /*! 107 * 108 * \brief Calculate second order autocorrelation using 2 accumulators 109 * 110 */ 111 #if !defined(FUNCTION_autoCorr2nd_real) 112 INT 113 autoCorr2nd_real (ACORR_COEFS *ac, /*!< Pointer to autocorrelation coeffs */ 114 const FIXP_DBL *reBuffer, /*!< Pointer to to real part of input samples */ 115 const int len /*!< Number input samples */ 116 ) 117 { 118 int j, autoCorrScaling, mScale; 119 120 FIXP_DBL accu1, accu2, accu3, accu4, accu5; 121 122 const FIXP_DBL *pReBuf; 123 124 const FIXP_DBL *realBuf = reBuffer; 125 126 /* 127 r11r,r22r 128 r01r,r12r 129 r02r 130 */ 131 pReBuf = realBuf-2; 132 accu5 = ( (fMultDiv2(pReBuf[0], pReBuf[2]) + 133 fMultDiv2(pReBuf[1], pReBuf[3])) SHIFT); 134 pReBuf++; 135 136 //len must be even 137 accu1 = fPow2Div2(pReBuf[0]) SHIFT; 138 accu3 = fMultDiv2(pReBuf[0], pReBuf[1]) SHIFT; 139 pReBuf++; 140 141 for ( j = (len - 2)>>1; j != 0; j--,pReBuf+=2 ) { 142 143 accu1 += ( (fPow2Div2(pReBuf[0]) + 144 fPow2Div2(pReBuf[1])) SHIFT); 145 146 accu3 += ( (fMultDiv2(pReBuf[0], pReBuf[1]) + 147 fMultDiv2(pReBuf[1], pReBuf[2])) SHIFT); 148 149 accu5 += ( (fMultDiv2(pReBuf[0], pReBuf[2]) + 150 fMultDiv2(pReBuf[1], pReBuf[3])) SHIFT); 151 152 } 153 154 accu2 = (fPow2Div2(realBuf[-2]) SHIFT); 155 accu2 += accu1; 156 157 accu1 += (fPow2Div2(realBuf[len - 2]) SHIFT); 158 159 accu4 = (fMultDiv2(realBuf[-1],realBuf[-2]) SHIFT); 160 accu4 += accu3; 161 162 accu3 += (fMultDiv2(realBuf[len - 1],realBuf[len - 2]) SHIFT); 163 164 mScale = CntLeadingZeros( (accu1 | accu2 | fAbs(accu3) | fAbs(accu4) | fAbs(accu5)) ) - 1; 165 autoCorrScaling = mScale - 1 - SHIFT_FACTOR; /* -1 because of fMultDiv2*/ 166 167 /* Scale to common scale factor */ 168 ac->r11r = accu1 << mScale; 169 ac->r22r = accu2 << mScale; 170 ac->r01r = accu3 << mScale; 171 ac->r12r = accu4 << mScale; 172 ac->r02r = accu5 << mScale; 173 174 ac->det = (fMultDiv2(ac->r11r,ac->r22r) - fMultDiv2(ac->r12r,ac->r12r)) ; 175 mScale = CountLeadingBits(fAbs(ac->det)); 176 177 ac->det <<= mScale; 178 ac->det_scale = mScale - 1; 179 180 return autoCorrScaling; 181 } 182 #endif 183 184 #ifndef LOW_POWER_SBR_ONLY 185 #if !defined(FUNCTION_autoCorr2nd_cplx) 186 INT 187 autoCorr2nd_cplx (ACORR_COEFS *ac, /*!< Pointer to autocorrelation coeffs */ 188 const FIXP_DBL *reBuffer, /*!< Pointer to real part of input samples */ 189 const FIXP_DBL *imBuffer, /*!< Pointer to imag part of input samples */ 190 const int len /*!< Number of input samples */ 191 ) 192 { 193 194 int j, autoCorrScaling, mScale, len_scale; 195 196 FIXP_DBL accu0, accu1,accu2, accu3, accu4, accu5, accu6, accu7, accu8; 197 198 const FIXP_DBL *pReBuf, *pImBuf; 199 200 const FIXP_DBL *realBuf = reBuffer; 201 const FIXP_DBL *imagBuf = imBuffer; 202 203 (len>64) ? (len_scale = 6) : (len_scale = 5); 204 /* 205 r00r, 206 r11r,r22r 207 r01r,r12r 208 r01i,r12i 209 r02r,r02i 210 */ 211 accu1 = accu3 = accu5 = accu7 = accu8 = FL2FXCONST_DBL(0.0f); 212 213 pReBuf = realBuf-2, pImBuf = imagBuf-2; 214 accu7 += ( (fMultDiv2(pReBuf[2], pReBuf[0]) + fMultDiv2(pImBuf[2], pImBuf[0])) >> len_scale); 215 accu8 += ( (fMultDiv2(pImBuf[2], pReBuf[0]) - fMultDiv2(pReBuf[2], pImBuf[0])) >> len_scale); 216 217 pReBuf = realBuf-1, pImBuf = imagBuf-1; 218 for ( j = (len - 1); j != 0; j--,pReBuf++,pImBuf++ ){ 219 accu1 += ( (fPow2Div2(pReBuf[0] ) + fPow2Div2(pImBuf[0] )) >> len_scale); 220 accu3 += ( (fMultDiv2(pReBuf[0], pReBuf[1]) + fMultDiv2(pImBuf[0], pImBuf[1])) >> len_scale); 221 accu5 += ( (fMultDiv2(pImBuf[1], pReBuf[0]) - fMultDiv2(pReBuf[1], pImBuf[0])) >> len_scale); 222 accu7 += ( (fMultDiv2(pReBuf[2], pReBuf[0]) + fMultDiv2(pImBuf[2], pImBuf[0])) >> len_scale); 223 accu8 += ( (fMultDiv2(pImBuf[2], pReBuf[0]) - fMultDiv2(pReBuf[2], pImBuf[0])) >> len_scale); 224 } 225 226 accu2 = ( (fPow2Div2(realBuf[-2]) + fPow2Div2(imagBuf[-2])) >> len_scale); 227 accu2 += accu1; 228 229 accu1 += ( (fPow2Div2(realBuf[len-2]) + 230 fPow2Div2(imagBuf[len-2])) >> len_scale); 231 accu0 = ( (fPow2Div2(realBuf[len-1]) + 232 fPow2Div2(imagBuf[len-1])) >> len_scale) - 233 ( (fPow2Div2(realBuf[-1]) + 234 fPow2Div2(imagBuf[-1])) >> len_scale); 235 accu0 += accu1; 236 237 accu4 = ( (fMultDiv2(realBuf[-1], realBuf[-2]) + 238 fMultDiv2(imagBuf[-1], imagBuf[-2])) >> len_scale); 239 accu4 += accu3; 240 241 accu3 += ( (fMultDiv2(realBuf[len-1], realBuf[len-2]) + 242 fMultDiv2(imagBuf[len-1], imagBuf[len-2])) >> len_scale); 243 244 accu6 = ( (fMultDiv2(imagBuf[-1], realBuf[-2]) - 245 fMultDiv2(realBuf[-1], imagBuf[-2])) >> len_scale); 246 accu6 += accu5; 247 248 accu5 += ( (fMultDiv2(imagBuf[len - 1], realBuf[len - 2]) - 249 fMultDiv2(realBuf[len - 1], imagBuf[len - 2])) >> len_scale); 250 251 mScale = CntLeadingZeros( (accu0 | accu1 | accu2 | fAbs(accu3) | fAbs(accu4) | fAbs(accu5) | 252 fAbs(accu6) | fAbs(accu7) | fAbs(accu8)) ) - 1; 253 autoCorrScaling = mScale - 1 - len_scale; /* -1 because of fMultDiv2*/ 254 255 /* Scale to common scale factor */ 256 ac->r00r = (FIXP_DBL)accu0 << mScale; 257 ac->r11r = (FIXP_DBL)accu1 << mScale; 258 ac->r22r = (FIXP_DBL)accu2 << mScale; 259 ac->r01r = (FIXP_DBL)accu3 << mScale; 260 ac->r12r = (FIXP_DBL)accu4 << mScale; 261 ac->r01i = (FIXP_DBL)accu5 << mScale; 262 ac->r12i = (FIXP_DBL)accu6 << mScale; 263 ac->r02r = (FIXP_DBL)accu7 << mScale; 264 ac->r02i = (FIXP_DBL)accu8 << mScale; 265 266 ac->det = ( fMultDiv2(ac->r11r,ac->r22r) >> 1 ) - 267 ( (fMultDiv2(ac->r12r,ac->r12r) + fMultDiv2(ac->r12i,ac->r12i)) >> 1 ); 268 mScale = CountLeadingBits(fAbs(ac->det)); 269 270 ac->det <<= mScale; 271 ac->det_scale = mScale - 2; 272 273 return autoCorrScaling; 274 } 275 #endif /* FUNCTION_autoCorr2nd_cplx */ 276 #endif /* LOW_POWER_SBR_ONLY */ 277 278 279
