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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: Perceptual entropie module
+
+******************************************************************************/
+
+#include "line_pe.h"
+#include "sf_estim.h"
+#include "bit_cnt.h"
+
+#include "genericStds.h"
+
+static const FIXP_DBL C1LdData = FL2FXCONST_DBL(3.0/LD_DATA_SCALING);        /* C1 = 3.0 = log(8.0)/log(2) */
+static const FIXP_DBL C2LdData = FL2FXCONST_DBL(1.3219281/LD_DATA_SCALING);  /* C2 = 1.3219281 = log(2.5)/log(2) */
+static const FIXP_DBL C3LdData = FL2FXCONST_DBL(0.5593573);                  /* 1-C2/C1 */
+
+
+/* constants that do not change during successive pe calculations */
+void FDKaacEnc_prepareSfbPe(PE_CHANNEL_DATA *peChanData,
+                  const FIXP_DBL  *sfbEnergyLdData,
+                  const FIXP_DBL  *sfbThresholdLdData,
+                  const FIXP_DBL  *sfbFormFactorLdData,
+                  const INT       *sfbOffset,
+                  const INT       sfbCnt,
+                  const INT       sfbPerGroup,
+                  const INT       maxSfbPerGroup)
+{
+   INT sfbGrp,sfb;
+   INT sfbWidth;
+   FIXP_DBL avgFormFactorLdData;
+   const FIXP_DBL formFacScaling = FL2FXCONST_DBL((float)FORM_FAC_SHIFT/LD_DATA_SCALING);
+
+   for (sfbGrp = 0;sfbGrp < sfbCnt;sfbGrp+=sfbPerGroup) {
+    for (sfb=0; sfb<maxSfbPerGroup; sfb++) {
+      if ((FIXP_DBL)sfbEnergyLdData[sfbGrp+sfb] > (FIXP_DBL)sfbThresholdLdData[sfbGrp+sfb]) {
+         sfbWidth = sfbOffset[sfbGrp+sfb+1] - sfbOffset[sfbGrp+sfb];
+         /* estimate number of active lines */
+         avgFormFactorLdData = ((-sfbEnergyLdData[sfbGrp+sfb]>>1) + (CalcLdInt(sfbWidth)>>1))>>1;
+         peChanData->sfbNLines[sfbGrp+sfb] =
+           (INT)CalcInvLdData( (sfbFormFactorLdData[sfbGrp+sfb] + formFacScaling) + avgFormFactorLdData);
+      }
+      else {
+         peChanData->sfbNLines[sfbGrp+sfb] = 0;
+      }
+    }
+   }
+}
+
+/*
+   formula for one sfb:
+   pe = n * ld(en/thr),                if ld(en/thr) >= C1
+   pe = n * (C2 + C3 * ld(en/thr)),    if ld(en/thr) <  C1
+   n: estimated number of lines in sfb,
+   ld(x) = log(x)/log(2)
+
+   constPart is sfbPe without the threshold part n*ld(thr) or n*C3*ld(thr)
+*/
+void FDKaacEnc_calcSfbPe(PE_CHANNEL_DATA  *RESTRICT peChanData,
+               const FIXP_DBL   *RESTRICT sfbEnergyLdData,
+               const FIXP_DBL   *RESTRICT sfbThresholdLdData,
+               const INT        sfbCnt,
+               const INT        sfbPerGroup,
+               const INT        maxSfbPerGroup,
+               const INT       *isBook,
+               const INT       *isScale)
+{
+   INT sfbGrp,sfb;
+   INT nLines;
+   FIXP_DBL logDataRatio;
+   INT lastValIs = 0;
+
+   peChanData->pe = 0;
+   peChanData->constPart = 0;
+   peChanData->nActiveLines = 0;
+
+   for(sfbGrp = 0;sfbGrp < sfbCnt;sfbGrp+=sfbPerGroup){
+    for (sfb=0; sfb<maxSfbPerGroup; sfb++) {
+      if ((FIXP_DBL)sfbEnergyLdData[sfbGrp+sfb] > (FIXP_DBL)sfbThresholdLdData[sfbGrp+sfb]) {
+         logDataRatio = (FIXP_DBL)(sfbEnergyLdData[sfbGrp+sfb] - sfbThresholdLdData[sfbGrp+sfb]);
+         nLines = peChanData->sfbNLines[sfbGrp+sfb];
+         if (logDataRatio >= C1LdData) {
+            /* scale sfbPe and sfbConstPart with PE_CONSTPART_SHIFT */
+            peChanData->sfbPe[sfbGrp+sfb] = fMultDiv2(logDataRatio, (FIXP_DBL)(nLines<<(LD_DATA_SHIFT+PE_CONSTPART_SHIFT+1)));
+            peChanData->sfbConstPart[sfbGrp+sfb] =
+                    fMultDiv2(sfbEnergyLdData[sfbGrp+sfb], (FIXP_DBL)(nLines<<(LD_DATA_SHIFT+PE_CONSTPART_SHIFT+1))); ;
+
+         }
+         else {
+            /* scale sfbPe and sfbConstPart with PE_CONSTPART_SHIFT */
+            peChanData->sfbPe[sfbGrp+sfb] =
+                     fMultDiv2(((FIXP_DBL)C2LdData + fMult(C3LdData,logDataRatio)), (FIXP_DBL)(nLines<<(LD_DATA_SHIFT+PE_CONSTPART_SHIFT+1)));
+
+            peChanData->sfbConstPart[sfbGrp+sfb] =
+                     fMultDiv2(((FIXP_DBL)C2LdData + fMult(C3LdData,sfbEnergyLdData[sfbGrp+sfb])),
+                           (FIXP_DBL)(nLines<<(LD_DATA_SHIFT+PE_CONSTPART_SHIFT+1))) ;
+
+            nLines = fMultI(C3LdData, nLines);
+         }
+         peChanData->sfbNActiveLines[sfbGrp+sfb] = nLines;
+      }
+      else if( isBook[sfb] ) {
+        /* provide for cost of scale factor for Intensity */
+        INT delta = isScale[sfbGrp+sfb] - lastValIs;
+        lastValIs = isScale[sfbGrp+sfb];
+        peChanData->sfbPe[sfbGrp+sfb] = FDKaacEnc_bitCountScalefactorDelta(delta)<<PE_CONSTPART_SHIFT;
+        peChanData->sfbConstPart[sfbGrp+sfb] = 0;
+        peChanData->sfbNActiveLines[sfbGrp+sfb] = 0;
+      }
+      else {
+         peChanData->sfbPe[sfbGrp+sfb] = 0;
+         peChanData->sfbConstPart[sfbGrp+sfb] = 0;
+         peChanData->sfbNActiveLines[sfbGrp+sfb] = 0;
+      }
+      /* sum up peChanData values */
+      peChanData->pe += peChanData->sfbPe[sfbGrp+sfb];
+      peChanData->constPart += peChanData->sfbConstPart[sfbGrp+sfb];
+      peChanData->nActiveLines += peChanData->sfbNActiveLines[sfbGrp+sfb];
+    }
+   }
+   /* correct scaled pe and constPart values */
+   peChanData->pe>>=PE_CONSTPART_SHIFT;
+   peChanData->constPart>>=PE_CONSTPART_SHIFT;
+}