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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-4 AAC Encoder  **************************
+
+   Initial author:       M. Werner
+   contents/description: Band/Line energy calculations
+
+******************************************************************************/
+
+#include "band_nrg.h"
+
+
+/*****************************************************************************
+  functionname: FDKaacEnc_CalcSfbMaxScaleSpec
+  description:
+  input:
+  output:
+*****************************************************************************/
+void
+FDKaacEnc_CalcSfbMaxScaleSpec(const FIXP_DBL *RESTRICT mdctSpectrum,
+                              const INT      *RESTRICT bandOffset,
+                              INT            *RESTRICT sfbMaxScaleSpec,
+                              const INT       numBands)
+{
+  INT i,j;
+  FIXP_DBL maxSpc, tmp;
+
+  for(i=0; i<numBands; i++) {
+    maxSpc = (FIXP_DBL)0;
+    for (j=bandOffset[i]; j<bandOffset[i+1]; j++) {
+      tmp = fixp_abs(mdctSpectrum[j]);
+      maxSpc = fixMax(maxSpc, tmp);
+    }
+    sfbMaxScaleSpec[i] = (maxSpc==(FIXP_DBL)0) ? (DFRACT_BITS-2) : CntLeadingZeros(maxSpc)-1;
+    /* CountLeadingBits() is not necessary here since test value is always > 0 */
+  }
+}
+
+/*****************************************************************************
+  functionname: FDKaacEnc_CheckBandEnergyOptim
+  description:
+  input:
+  output:
+*****************************************************************************/
+FIXP_DBL
+FDKaacEnc_CheckBandEnergyOptim(const FIXP_DBL *RESTRICT mdctSpectrum,
+                               INT            *RESTRICT sfbMaxScaleSpec,
+                               const INT      *RESTRICT bandOffset,
+                               const INT       numBands,
+                               FIXP_DBL       *RESTRICT bandEnergy,
+                               FIXP_DBL       *RESTRICT bandEnergyLdData,
+                               INT             minSpecShift)
+{
+  INT i, j, scale, nr = 0;
+  FIXP_DBL maxNrgLd = FL2FXCONST_DBL(-1.0f);
+  FIXP_DBL maxNrg = 0;
+  FIXP_DBL spec;
+
+  for(i=0; i<numBands; i++) {
+    scale = fixMax(0, sfbMaxScaleSpec[i]-4);
+    FIXP_DBL tmp = 0;
+    for (j=bandOffset[i]; j<bandOffset[i+1]; j++){
+       spec = mdctSpectrum[j]<<scale;
+       tmp = fPow2AddDiv2(tmp, spec);
+    }
+    bandEnergy[i] = tmp<<1;
+
+    /* calculate ld of bandNrg, subtract scaling */
+    bandEnergyLdData[i] = CalcLdData(bandEnergy[i]);
+    if (bandEnergyLdData[i] != FL2FXCONST_DBL(-1.0f)) {
+      bandEnergyLdData[i] -= scale*FL2FXCONST_DBL(2.0/64);
+    }
+    /* find index of maxNrg */
+    if (bandEnergyLdData[i] > maxNrgLd) {
+        maxNrgLd = bandEnergyLdData[i];
+        nr = i;
+    }
+  }
+
+  /* return unscaled maxNrg*/
+  scale = fixMax(0,sfbMaxScaleSpec[nr]-4);
+  scale = fixMax(2*(minSpecShift-scale),-(DFRACT_BITS-1));
+
+  maxNrg = scaleValue(bandEnergy[nr], scale);
+
+  return maxNrg;
+}
+
+/*****************************************************************************
+  functionname: FDKaacEnc_CalcBandEnergyOptimLong
+  description:
+  input:
+  output:
+*****************************************************************************/
+INT
+FDKaacEnc_CalcBandEnergyOptimLong(const FIXP_DBL *RESTRICT mdctSpectrum,
+                                  INT            *RESTRICT sfbMaxScaleSpec,
+                                  const INT      *RESTRICT bandOffset,
+                                  const INT       numBands,
+                                  FIXP_DBL       *RESTRICT bandEnergy,
+                                  FIXP_DBL       *RESTRICT bandEnergyLdData)
+{
+  INT i, j, shiftBits = 0;
+  FIXP_DBL maxNrgLd = FL2FXCONST_DBL(0.0f);
+
+  FIXP_DBL spec;
+
+  for(i=0; i<numBands; i++) {
+     INT leadingBits = sfbMaxScaleSpec[i]-4;            /* max sfbWidth = 96 ; 2^7=128 => 7/2 = 4 (spc*spc) */
+     FIXP_DBL tmp = FL2FXCONST_DBL(0.0);
+     /* don't use scaleValue() here, it increases workload quite sufficiently... */
+     if (leadingBits>=0) {
+        for (j=bandOffset[i];j<bandOffset[i+1];j++) {
+           spec = mdctSpectrum[j]<<leadingBits;
+           tmp = fPow2AddDiv2(tmp, spec);
+        }
+     } else {
+        INT shift = -leadingBits;
+        for (j=bandOffset[i];j<bandOffset[i+1];j++){
+           spec = mdctSpectrum[j]>>shift;
+           tmp = fPow2AddDiv2(tmp, spec);
+        }
+     }
+     bandEnergy[i] = tmp<<1;
+  }
+
+  /* calculate ld of bandNrg, subtract scaling */
+  LdDataVector(bandEnergy, bandEnergyLdData, numBands);
+  for(i=numBands; i--!=0; ) {
+      FIXP_DBL scaleDiff = (sfbMaxScaleSpec[i]-4)*FL2FXCONST_DBL(2.0/64);
+
+      bandEnergyLdData[i] = (bandEnergyLdData[i] >= ((FL2FXCONST_DBL(-1.f)>>1) + (scaleDiff>>1)))
+                          ? bandEnergyLdData[i]-scaleDiff : FL2FXCONST_DBL(-1.f);
+      /* find maxNrgLd */
+      maxNrgLd = fixMax(maxNrgLd, bandEnergyLdData[i]);
+  }
+
+  if (maxNrgLd<=(FIXP_DBL)0)
+  {
+     for(i=numBands; i--!=0; )
+     {
+         INT scale = fixMin((sfbMaxScaleSpec[i]-4)<<1,(DFRACT_BITS-1));
+         bandEnergy[i] = scaleValue(bandEnergy[i], -scale);
+     }
+     return 0;
+  }
+  else
+  {  /* scale down NRGs */
+     while (maxNrgLd>FL2FXCONST_DBL(0.0f))
+     {
+        maxNrgLd -=  FL2FXCONST_DBL(2.0/64);
+        shiftBits++;
+     }
+     for(i=numBands; i--!=0; )
+     {
+         INT scale = fixMin( ((sfbMaxScaleSpec[i]-4)+shiftBits)<<1, (DFRACT_BITS-1));
+         bandEnergyLdData[i] -= shiftBits*FL2FXCONST_DBL(2.0/64);
+         bandEnergy[i] = scaleValue(bandEnergy[i], -scale);
+     }
+     return shiftBits;
+  }
+}
+
+
+/*****************************************************************************
+  functionname: FDKaacEnc_CalcBandEnergyOptimShort
+  description:
+  input:
+  output:
+*****************************************************************************/
+void
+FDKaacEnc_CalcBandEnergyOptimShort(const FIXP_DBL *RESTRICT mdctSpectrum,
+                                   INT            *RESTRICT sfbMaxScaleSpec,
+                                   const INT      *RESTRICT bandOffset,
+                                   const INT       numBands,
+                                   FIXP_DBL       *RESTRICT bandEnergy)
+{
+  INT i, j;
+
+  for(i=0; i<numBands; i++)
+  {
+    int leadingBits = fixMax(0,sfbMaxScaleSpec[i]-4);            /* max sfbWidth = 96 ; 2^7=128 => 7/2 = 4 (spc*spc) */
+    FIXP_DBL tmp = FL2FXCONST_DBL(0.0);
+    for (j=bandOffset[i];j<bandOffset[i+1];j++)
+    {
+       FIXP_DBL spec = mdctSpectrum[j]<<leadingBits;
+       tmp = fPow2AddDiv2(tmp, spec);
+    }
+    bandEnergy[i] = tmp<<1;
+  }
+
+  for(i=0; i<numBands; i++)
+  {
+      INT scale = 2*fixMax(0,sfbMaxScaleSpec[i]-4);            /* max sfbWidth = 96 ; 2^7=128 => 7/2 = 4 (spc*spc) */
+      scale = fixMin(scale,(DFRACT_BITS-1));
+      bandEnergy[i] >>= scale;
+  }
+}
+
+
+/*****************************************************************************
+  functionname: FDKaacEnc_CalcBandNrgMSOpt
+  description:
+  input:
+  output:
+*****************************************************************************/
+void FDKaacEnc_CalcBandNrgMSOpt(const FIXP_DBL   *RESTRICT mdctSpectrumLeft,
+                                const FIXP_DBL   *RESTRICT mdctSpectrumRight,
+                                INT              *RESTRICT sfbMaxScaleSpecLeft,
+                                INT              *RESTRICT sfbMaxScaleSpecRight,
+                                const INT        *RESTRICT bandOffset,
+                                const INT         numBands,
+                                FIXP_DBL         *RESTRICT bandEnergyMid,
+                                FIXP_DBL         *RESTRICT bandEnergySide,
+                                INT               calcLdData,
+                                FIXP_DBL         *RESTRICT bandEnergyMidLdData,
+                                FIXP_DBL         *RESTRICT bandEnergySideLdData)
+{
+  INT i, j, minScale;
+  FIXP_DBL NrgMid, NrgSide, specm, specs;
+
+  for (i=0; i<numBands; i++) {
+
+    NrgMid = NrgSide = FL2FXCONST_DBL(0.0);
+    minScale = fixMin(sfbMaxScaleSpecLeft[i], sfbMaxScaleSpecRight[i])-4;
+    minScale = fixMax(0, minScale);
+
+    if (minScale > 0) {
+      for (j=bandOffset[i];j<bandOffset[i+1];j++) {
+          FIXP_DBL specL = mdctSpectrumLeft[j]<<(minScale-1);
+          FIXP_DBL specR = mdctSpectrumRight[j]<<(minScale-1);
+          specm = specL + specR;
+          specs = specL - specR;
+          NrgMid = fPow2AddDiv2(NrgMid, specm);
+          NrgSide = fPow2AddDiv2(NrgSide, specs);
+      }
+    } else {
+      for (j=bandOffset[i];j<bandOffset[i+1];j++) {
+          FIXP_DBL specL = mdctSpectrumLeft[j]>>1;
+          FIXP_DBL specR = mdctSpectrumRight[j]>>1;
+          specm = specL + specR;
+          specs = specL - specR;
+          NrgMid = fPow2AddDiv2(NrgMid, specm);
+          NrgSide = fPow2AddDiv2(NrgSide, specs);
+      }
+    }
+    bandEnergyMid[i] = NrgMid<<1;
+    bandEnergySide[i] = NrgSide<<1;
+  }
+
+  if(calcLdData) {
+    LdDataVector(bandEnergyMid, bandEnergyMidLdData, numBands);
+    LdDataVector(bandEnergySide, bandEnergySideLdData, numBands);
+  }
+
+  for (i=0; i<numBands; i++)
+  {
+    INT minScale = fixMin(sfbMaxScaleSpecLeft[i], sfbMaxScaleSpecRight[i]);
+    INT scale = fixMax(0, 2*(minScale-4));
+
+    if (calcLdData)
+    {
+       /* using the minimal scaling of left and right channel can cause very small energies;
+       check ldNrg before subtract scaling multiplication: fract*INT we don't need fMult */
+       
+       int minus = scale*FL2FXCONST_DBL(1.0/64);
+
+       if (bandEnergyMidLdData[i] != FL2FXCONST_DBL(-1.0f))
+         bandEnergyMidLdData[i] -= minus;
+
+       if (bandEnergySideLdData[i] != FL2FXCONST_DBL(-1.0f))
+         bandEnergySideLdData[i] -= minus;
+    }
+    scale = fixMin(scale, (DFRACT_BITS-1));
+    bandEnergyMid[i]  >>= scale;
+    bandEnergySide[i] >>= scale;
+  }
+}