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+
+/* -----------------------------------------------------------------------------------------------------------
+Software License for The Fraunhofer FDK AAC Codec Library for Android
+
+© Copyright  1995 - 2012 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
+  All rights reserved.
+
+ 1.    INTRODUCTION
+The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
+the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
+This FDK AAC Codec software is intended to be used on a wide variety of Android devices.
+
+AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
+audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
+independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
+of the MPEG specifications.
+
+Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
+may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
+individually for the purpose of encoding or decoding bit streams in products that are compliant with
+the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
+these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
+software may already be covered under those patent licenses when it is used for those licensed purposes only.
+
+Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
+are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
+applications information and documentation.
+
+2.    COPYRIGHT LICENSE
+
+Redistribution and use in source and binary forms, with or without modification, are permitted without
+payment of copyright license fees provided that you satisfy the following conditions:
+
+You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
+your modifications thereto in source code form.
+
+You must retain the complete text of this software license in the documentation and/or other materials
+provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
+You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
+modifications thereto to recipients of copies in binary form.
+
+The name of Fraunhofer may not be used to endorse or promote products derived from this library without
+prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
+software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
+and the date of any change. For modified versions of the FDK AAC Codec, the term
+"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
+"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
+ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
+respect to this software.
+
+You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
+by appropriate patent licenses.
+
+4.    DISCLAIMER
+
+This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
+"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
+of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
+including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
+or business interruption, however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of this software, even if
+advised of the possibility of such damage.
+
+5.    CONTACT INFORMATION
+
+Fraunhofer Institute for Integrated Circuits IIS
+Attention: Audio and Multimedia Departments - FDK AAC LL
+Am Wolfsmantel 33
+91058 Erlangen, Germany
+
+www.iis.fraunhofer.de/amm
+amm-info@iis.fraunhofer.de
+----------------------------------------------------------------------------------------------------------- */
+
+/******************************** MPEG Audio Encoder **************************
+
+   Initial author:       M.Werner
+   contents/description: Short block grouping
+
+******************************************************************************/
+#include "psy_const.h"
+#include "interface.h"
+
+/*
+* this routine does not work in-place
+*/
+
+void
+FDKaacEnc_groupShortData(FIXP_DBL      *mdctSpectrum,     /* in-out                           */
+               SFB_THRESHOLD *sfbThreshold,     /* in-out                           */
+               SFB_ENERGY    *sfbEnergy,        /* in-out                           */
+               SFB_ENERGY    *sfbEnergyMS,      /* in-out                           */
+               SFB_ENERGY    *sfbSpreadEnergy,
+               const INT      sfbCnt,
+               const INT      sfbActive,
+               const INT     *sfbOffset,
+               const FIXP_DBL *sfbMinSnrLdData,
+               INT           *groupedSfbOffset,       /* out */
+               INT           *maxSfbPerGroup,         /* out */
+               FIXP_DBL      *groupedSfbMinSnrLdData,
+               const INT      noOfGroups,
+               const INT     *groupLen,
+               const INT      granuleLength)
+{
+  INT i,j;
+  INT line;       /* counts through lines              */
+  INT sfb;        /* counts through scalefactor bands  */
+  INT grp;        /* counts through groups             */
+  INT wnd;        /* counts through windows in a group */
+  INT offset;     /* needed in sfbOffset grouping      */
+  INT highestSfb;
+
+  INT granuleLength_short = granuleLength/TRANS_FAC;
+
+  /* for short blocks: regroup spectrum and */
+  /* group energies and thresholds according to grouping */
+  C_ALLOC_SCRATCH_START(tmpSpectrum, FIXP_DBL, (1024));
+
+  /* calculate maxSfbPerGroup */
+  highestSfb = 0;
+  for (wnd = 0; wnd < TRANS_FAC; wnd++)
+  {
+    for (sfb = sfbActive-1; sfb >= highestSfb; sfb--)
+    {
+      for (line = sfbOffset[sfb+1]-1; line >= sfbOffset[sfb]; line--)
+      {
+        if ( mdctSpectrum[wnd*granuleLength_short+line] != FL2FXCONST_SPC(0.0) ) break; /* this band is not completely zero */
+      }
+      if (line >= sfbOffset[sfb]) break;                                      /* this band was not completely zero */
+    }
+    highestSfb = fixMax(highestSfb, sfb);
+  }
+  highestSfb = highestSfb > 0 ? highestSfb : 0;
+  *maxSfbPerGroup = highestSfb+1;
+
+  /* calculate groupedSfbOffset */
+  i = 0;
+  offset = 0;
+  for (grp = 0; grp < noOfGroups; grp++)
+  {
+      for (sfb = 0; sfb < sfbActive+1; sfb++)
+      {
+          groupedSfbOffset[i++] = offset + sfbOffset[sfb] * groupLen[grp];
+      }
+      i +=  sfbCnt-sfb;
+      offset += groupLen[grp] * granuleLength_short;
+  }
+  groupedSfbOffset[i++] = granuleLength;
+
+  /* calculate groupedSfbMinSnr */
+  i = 0;
+  for (grp = 0; grp < noOfGroups; grp++)
+  {
+    for (sfb = 0; sfb < sfbActive; sfb++)
+    {
+      groupedSfbMinSnrLdData[i++] = sfbMinSnrLdData[sfb];
+    }
+    i +=  sfbCnt-sfb;
+  }
+
+  /* sum up sfbThresholds */
+  wnd = 0;
+  i = 0;
+  for (grp = 0; grp < noOfGroups; grp++)
+  {
+    for (sfb = 0; sfb < sfbActive; sfb++)
+    {
+      FIXP_DBL thresh = sfbThreshold->Short[wnd][sfb];
+      for (j=1; j<groupLen[grp]; j++)
+      {
+        thresh += sfbThreshold->Short[wnd+j][sfb];
+      }
+      sfbThreshold->Long[i++] = thresh;
+    }
+    i +=  sfbCnt-sfb;
+    wnd += groupLen[grp];
+  }
+
+  /* sum up sfbEnergies left/right */
+  wnd = 0;
+  i = 0;
+  for (grp = 0; grp < noOfGroups; grp++)
+  {
+    for (sfb = 0; sfb < sfbActive; sfb++)
+    {
+      FIXP_DBL energy = sfbEnergy->Short[wnd][sfb];
+      for (j=1; j<groupLen[grp]; j++)
+      {
+        energy += sfbEnergy->Short[wnd+j][sfb];
+      }
+      sfbEnergy->Long[i++] = energy;
+    }
+    i +=  sfbCnt-sfb;
+    wnd += groupLen[grp];
+  }
+
+  /* sum up sfbEnergies mid/side */
+  wnd = 0;
+  i = 0;
+  for (grp = 0; grp < noOfGroups; grp++)
+  {
+    for (sfb = 0; sfb < sfbActive; sfb++)
+    {
+      FIXP_DBL energy = sfbEnergyMS->Short[wnd][sfb];
+      for (j=1; j<groupLen[grp]; j++)
+      {
+        energy += sfbEnergyMS->Short[wnd+j][sfb];
+      }
+      sfbEnergyMS->Long[i++] = energy;
+    }
+    i +=  sfbCnt-sfb;
+    wnd += groupLen[grp];
+  }
+
+  /* sum up sfbSpreadEnergies */
+  wnd = 0;
+  i = 0;
+  for (grp = 0; grp < noOfGroups; grp++)
+  {
+    for (sfb = 0; sfb < sfbActive; sfb++)
+    {
+      FIXP_DBL energy = sfbSpreadEnergy->Short[wnd][sfb];
+      for (j=1; j<groupLen[grp]; j++)
+      {
+         energy += sfbSpreadEnergy->Short[wnd+j][sfb];
+      }
+      sfbSpreadEnergy->Long[i++] = energy;
+    }
+    i +=  sfbCnt-sfb;
+    wnd += groupLen[grp];
+  }
+
+  /* re-group spectrum */
+  wnd = 0;
+  i = 0;
+  for (grp = 0; grp < noOfGroups; grp++)
+  {
+    for (sfb = 0; sfb < sfbActive; sfb++)
+    {
+      int width = sfbOffset[sfb+1]-sfbOffset[sfb];
+      FIXP_DBL *pMdctSpectrum = &mdctSpectrum[sfbOffset[sfb]] + wnd*granuleLength_short;
+      for (j = 0; j < groupLen[grp]; j++)
+      {
+        FIXP_DBL *pTmp = pMdctSpectrum;
+        for (line = width; line > 0; line--)
+        {
+          tmpSpectrum[i++] = *pTmp++;
+        }
+        pMdctSpectrum += granuleLength_short;
+      }
+    }
+    i +=  (groupLen[grp]*(sfbOffset[sfbCnt]-sfbOffset[sfb]));
+    wnd += groupLen[grp];
+  }
+
+  FDKmemcpy(mdctSpectrum, tmpSpectrum, granuleLength*sizeof(FIXP_DBL));
+
+  C_ALLOC_SCRATCH_END(tmpSpectrum, FIXP_DBL, (1024))
+}