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 Initial author: M.Werner 87 contents/description: Short block grouping 88 89 ******************************************************************************/ 90 #include "psy_const.h" 91 #include "interface.h" 92 93 /* 94 * this routine does not work in-place 95 */ 96 97 static inline FIXP_DBL nrgAddSaturate(const FIXP_DBL a, const FIXP_DBL b) { 98 return ( (a>=(FIXP_DBL)MAXVAL_DBL-b) ? (FIXP_DBL)MAXVAL_DBL : (a + b) ); 99 } 100 101 void 102 FDKaacEnc_groupShortData(FIXP_DBL *mdctSpectrum, /* in-out */ 103 SFB_THRESHOLD *sfbThreshold, /* in-out */ 104 SFB_ENERGY *sfbEnergy, /* in-out */ 105 SFB_ENERGY *sfbEnergyMS, /* in-out */ 106 SFB_ENERGY *sfbSpreadEnergy, 107 const INT sfbCnt, 108 const INT sfbActive, 109 const INT *sfbOffset, 110 const FIXP_DBL *sfbMinSnrLdData, 111 INT *groupedSfbOffset, /* out */ 112 INT *maxSfbPerGroup, /* out */ 113 FIXP_DBL *groupedSfbMinSnrLdData, 114 const INT noOfGroups, 115 const INT *groupLen, 116 const INT granuleLength) 117 { 118 INT i,j; 119 INT line; /* counts through lines */ 120 INT sfb; /* counts through scalefactor bands */ 121 INT grp; /* counts through groups */ 122 INT wnd; /* counts through windows in a group */ 123 INT offset; /* needed in sfbOffset grouping */ 124 INT highestSfb; 125 126 INT granuleLength_short = granuleLength/TRANS_FAC; 127 128 /* for short blocks: regroup spectrum and */ 129 /* group energies and thresholds according to grouping */ 130 C_ALLOC_SCRATCH_START(tmpSpectrum, FIXP_DBL, (1024)); 131 132 /* calculate maxSfbPerGroup */ 133 highestSfb = 0; 134 for (wnd = 0; wnd < TRANS_FAC; wnd++) 135 { 136 for (sfb = sfbActive-1; sfb >= highestSfb; sfb--) 137 { 138 for (line = sfbOffset[sfb+1]-1; line >= sfbOffset[sfb]; line--) 139 { 140 if ( mdctSpectrum[wnd*granuleLength_short+line] != FL2FXCONST_SPC(0.0) ) break; /* this band is not completely zero */ 141 } 142 if (line >= sfbOffset[sfb]) break; /* this band was not completely zero */ 143 } 144 highestSfb = fixMax(highestSfb, sfb); 145 } 146 highestSfb = highestSfb > 0 ? highestSfb : 0; 147 *maxSfbPerGroup = highestSfb+1; 148 149 /* calculate groupedSfbOffset */ 150 i = 0; 151 offset = 0; 152 for (grp = 0; grp < noOfGroups; grp++) 153 { 154 for (sfb = 0; sfb < sfbActive+1; sfb++) 155 { 156 groupedSfbOffset[i++] = offset + sfbOffset[sfb] * groupLen[grp]; 157 } 158 i += sfbCnt-sfb; 159 offset += groupLen[grp] * granuleLength_short; 160 } 161 groupedSfbOffset[i++] = granuleLength; 162 163 /* calculate groupedSfbMinSnr */ 164 i = 0; 165 for (grp = 0; grp < noOfGroups; grp++) 166 { 167 for (sfb = 0; sfb < sfbActive; sfb++) 168 { 169 groupedSfbMinSnrLdData[i++] = sfbMinSnrLdData[sfb]; 170 } 171 i += sfbCnt-sfb; 172 } 173 174 /* sum up sfbThresholds */ 175 wnd = 0; 176 i = 0; 177 for (grp = 0; grp < noOfGroups; grp++) 178 { 179 for (sfb = 0; sfb < sfbActive; sfb++) 180 { 181 FIXP_DBL thresh = sfbThreshold->Short[wnd][sfb]; 182 for (j=1; j<groupLen[grp]; j++) 183 { 184 thresh = nrgAddSaturate(thresh, sfbThreshold->Short[wnd+j][sfb]); 185 } 186 sfbThreshold->Long[i++] = thresh; 187 } 188 i += sfbCnt-sfb; 189 wnd += groupLen[grp]; 190 } 191 192 /* sum up sfbEnergies left/right */ 193 wnd = 0; 194 i = 0; 195 for (grp = 0; grp < noOfGroups; grp++) 196 { 197 for (sfb = 0; sfb < sfbActive; sfb++) 198 { 199 FIXP_DBL energy = sfbEnergy->Short[wnd][sfb]; 200 for (j=1; j<groupLen[grp]; j++) 201 { 202 energy = nrgAddSaturate(energy, sfbEnergy->Short[wnd+j][sfb]); 203 } 204 sfbEnergy->Long[i++] = energy; 205 } 206 i += sfbCnt-sfb; 207 wnd += groupLen[grp]; 208 } 209 210 /* sum up sfbEnergies mid/side */ 211 wnd = 0; 212 i = 0; 213 for (grp = 0; grp < noOfGroups; grp++) 214 { 215 for (sfb = 0; sfb < sfbActive; sfb++) 216 { 217 FIXP_DBL energy = sfbEnergyMS->Short[wnd][sfb]; 218 for (j=1; j<groupLen[grp]; j++) 219 { 220 energy = nrgAddSaturate(energy, sfbEnergyMS->Short[wnd+j][sfb]); 221 } 222 sfbEnergyMS->Long[i++] = energy; 223 } 224 i += sfbCnt-sfb; 225 wnd += groupLen[grp]; 226 } 227 228 /* sum up sfbSpreadEnergies */ 229 wnd = 0; 230 i = 0; 231 for (grp = 0; grp < noOfGroups; grp++) 232 { 233 for (sfb = 0; sfb < sfbActive; sfb++) 234 { 235 FIXP_DBL energy = sfbSpreadEnergy->Short[wnd][sfb]; 236 for (j=1; j<groupLen[grp]; j++) 237 { 238 energy = nrgAddSaturate(energy, sfbSpreadEnergy->Short[wnd+j][sfb]); 239 } 240 sfbSpreadEnergy->Long[i++] = energy; 241 } 242 i += sfbCnt-sfb; 243 wnd += groupLen[grp]; 244 } 245 246 /* re-group spectrum */ 247 wnd = 0; 248 i = 0; 249 for (grp = 0; grp < noOfGroups; grp++) 250 { 251 for (sfb = 0; sfb < sfbActive; sfb++) 252 { 253 int width = sfbOffset[sfb+1]-sfbOffset[sfb]; 254 FIXP_DBL *pMdctSpectrum = &mdctSpectrum[sfbOffset[sfb]] + wnd*granuleLength_short; 255 for (j = 0; j < groupLen[grp]; j++) 256 { 257 FIXP_DBL *pTmp = pMdctSpectrum; 258 for (line = width; line > 0; line--) 259 { 260 tmpSpectrum[i++] = *pTmp++; 261 } 262 pMdctSpectrum += granuleLength_short; 263 } 264 } 265 i += (groupLen[grp]*(sfbOffset[sfbCnt]-sfbOffset[sfb])); 266 wnd += groupLen[grp]; 267 } 268 269 FDKmemcpy(mdctSpectrum, tmpSpectrum, granuleLength*sizeof(FIXP_DBL)); 270 271 C_ALLOC_SCRATCH_END(tmpSpectrum, FIXP_DBL, (1024)) 272 } 273
