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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. Lohwasser
+   contents/description: noisedet.c
+                         Routines for Noise Detection
+
+******************************************************************************/
+
+#include "noisedet.h"
+
+#include "aacenc_pns.h"
+#include "pnsparam.h"
+
+
+/*****************************************************************************
+
+    functionname: FDKaacEnc_fuzzyIsSmaller
+    description:  Fuzzy value calculation for "testVal is smaller than refVal"
+    returns:      fuzzy value
+    input:        test and ref Value,
+                  low and high Lim
+    output:       return fuzzy value
+
+*****************************************************************************/
+static FIXP_SGL FDKaacEnc_fuzzyIsSmaller( FIXP_DBL testVal,
+                                FIXP_DBL refVal,
+                                FIXP_DBL loLim,
+                                FIXP_DBL hiLim )
+{
+  if (refVal <= FL2FXCONST_DBL(0.0))
+        return( FL2FXCONST_SGL(0.0f) );
+  else if (testVal >= fMult((hiLim>>1)+(loLim>>1), refVal))
+        return( FL2FXCONST_SGL(0.0f) );
+  else  return( (FIXP_SGL)MAXVAL_SGL );
+}
+
+
+
+/*****************************************************************************
+
+    functionname: FDKaacEnc_noiseDetect
+    description:  detect tonal sfb's; two tests
+                  Powerdistribution:
+                    sfb splittet in four regions,
+                    compare the energy in all sections
+                  PsychTonality:
+                    compare tonality from chaosmeasure with reftonality
+    returns:
+    input:        spectrum of one large mdct
+                  number of sfb's
+                  pointer to offset of sfb's
+                  pointer to noiseFuzzyMeasure (modified)
+                  noiseparams struct
+                  pointer to sfb energies
+                  pointer to tonality calculated in chaosmeasure
+    output:       noiseFuzzy Measure
+
+*****************************************************************************/
+
+void FDKaacEnc_noiseDetect(FIXP_DBL    *RESTRICT mdctSpectrum,
+                 INT         *RESTRICT sfbMaxScaleSpec,
+                 INT          sfbActive,
+                 const INT   *RESTRICT sfbOffset,
+                 FIXP_SGL    *RESTRICT noiseFuzzyMeasure,
+                 NOISEPARAMS *np,
+                 FIXP_SGL    *RESTRICT sfbtonality )
+
+{
+  int    i, k, sfb, sfbWidth;
+  FIXP_SGL fuzzy, fuzzyTotal;
+  FIXP_DBL refVal, testVal;
+
+  /***** Start detection phase *****/
+  /* Start noise detection for each band based on a number of checks */
+  for (sfb=0; sfb<sfbActive; sfb++) {
+
+    fuzzyTotal = (FIXP_SGL)MAXVAL_SGL;
+    sfbWidth = sfbOffset[sfb+1] - sfbOffset[sfb];
+
+    /* Reset output for lower bands or too small bands */
+    if (sfb < np->startSfb  ||  sfbWidth < np->minSfbWidth) {
+      noiseFuzzyMeasure[sfb] = FL2FXCONST_SGL(0.0f);
+      continue;
+    }
+
+    if ( (np->detectionAlgorithmFlags & USE_POWER_DISTRIBUTION) && (fuzzyTotal > FL2FXCONST_SGL(0.5f)) ) {
+      FIXP_DBL fhelp1, fhelp2, fhelp3, fhelp4, maxVal, minVal;
+      INT leadingBits = fixMax(0,(sfbMaxScaleSpec[sfb] - 3));         /* max sfbWidth = 96/4 ; 2^5=32 => 5/2 = 3 (spc*spc) */
+
+      /*  check power distribution in four regions */
+      fhelp1 = fhelp2 = fhelp3 = fhelp4 = FL2FXCONST_DBL(0.0f);
+      k = sfbWidth >>2;  /* Width of a quarter band */
+
+      for (i=sfbOffset[sfb]; i<sfbOffset[sfb]+k; i++) {
+        fhelp1 = fPow2AddDiv2(fhelp1, mdctSpectrum[i]<<leadingBits);
+        fhelp2 = fPow2AddDiv2(fhelp2, mdctSpectrum[i+k]<<leadingBits);
+        fhelp3 = fPow2AddDiv2(fhelp3, mdctSpectrum[i+2*k]<<leadingBits);
+        fhelp4 = fPow2AddDiv2(fhelp4, mdctSpectrum[i+3*k]<<leadingBits);
+      }
+
+      /* get max into fhelp: */
+      maxVal = fixMax(fhelp1, fhelp2);
+      maxVal = fixMax(maxVal, fhelp3);
+      maxVal = fixMax(maxVal, fhelp4);
+
+      /* get min into fhelp1: */
+      minVal = fixMin(fhelp1, fhelp2);
+      minVal = fixMin(minVal, fhelp3);
+      minVal = fixMin(minVal, fhelp4);
+
+      /* Normalize min and max Val */
+      leadingBits = CountLeadingBits(maxVal);
+      testVal = maxVal << leadingBits;
+      refVal  = minVal << leadingBits;
+
+      /* calculate fuzzy value for power distribution */
+      testVal = fMultDiv2(testVal, np->powDistPSDcurve[sfb]);
+
+      fuzzy = FDKaacEnc_fuzzyIsSmaller(testVal,           /* 1/2 * maxValue * PSDcurve */
+                             refVal,            /* 1   * minValue            */
+                             FL2FXCONST_DBL(0.495),  /* 1/2 * loLim  (0.99f/2)    */
+                             FL2FXCONST_DBL(0.505)); /* 1/2 * hiLim  (1.01f/2)    */
+
+      fuzzyTotal = fixMin(fuzzyTotal, fuzzy);
+    }
+
+    if ( (np->detectionAlgorithmFlags & USE_PSYCH_TONALITY) && (fuzzyTotal > FL2FXCONST_SGL(0.5f)) ) {
+      /* Detection with tonality-value of psych. acoustic (here: 1 is tonal!)*/
+
+      testVal = FX_SGL2FX_DBL(sfbtonality[sfb])>>1;          /* 1/2 * sfbTonality         */
+      refVal  = np->refTonality;
+
+      fuzzy   = FDKaacEnc_fuzzyIsSmaller(testVal,
+                               refVal,
+                               FL2FXCONST_DBL(0.45f),    /* 1/2 * loLim  (0.9f/2)     */
+                               FL2FXCONST_DBL(0.55f));   /* 1/2 * hiLim  (1.1f/2)     */
+
+      fuzzyTotal = fixMin(fuzzyTotal, fuzzy);
+    }
+
+
+    /* Output of final result */
+    noiseFuzzyMeasure[sfb] = fuzzyTotal;
+  }
+}