libAACenc/src/grp_data.cpp

   1
   2 /* -----------------------------------------------------------------------------------------------------------
   3 Software License for The Fraunhofer FDK AAC Codec Library for Android
   4
   5 © Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur Förderung 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:
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  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.
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  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.
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  42 The name of Fraunhofer may not be used to endorse or promote products derived from this library without
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  44
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  46 software or your modifications thereto.
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  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."
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  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
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  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@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 }