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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 **************************
+
+   author:   M. Werner
+   contents/description: Convert chaos measure to the tonality index
+
+******************************************************************************/
+
+#include "tonality.h"
+#include "chaosmeasure.h"
+
+static const FIXP_DBL normlog = (FIXP_DBL)0xd977d949; /*FL2FXCONST_DBL(-0.4342944819f * FDKlog(2.0)/FDKlog(2.7182818)); */
+
+static void FDKaacEnc_CalcSfbTonality(FIXP_DBL      *RESTRICT spectrum,
+							INT           *RESTRICT sfbMaxScaleSpec,
+                            FIXP_DBL      *RESTRICT chaosMeasure,
+                            FIXP_SGL      *RESTRICT sfbTonality,
+                            INT           sfbCnt,
+                            const INT     *RESTRICT sfbOffset,
+                            FIXP_DBL      *RESTRICT sfbEnergyLD64 );
+
+
+void FDKaacEnc_CalculateFullTonality(FIXP_DBL      *RESTRICT spectrum,
+						             INT           *RESTRICT sfbMaxScaleSpec,
+                                     FIXP_DBL      *RESTRICT sfbEnergyLD64,
+                                     FIXP_SGL      *RESTRICT sfbTonality,
+                                     INT            sfbCnt,
+                                     const INT     *sfbOffset,
+                                     INT            usePns)
+{
+  INT j;
+#if defined(ARCH_PREFER_MULT_32x16)
+  FIXP_SGL alpha_0 = FL2FXCONST_SGL(0.25f);       /* used in smooth ChaosMeasure */
+  FIXP_SGL alpha_1 = FL2FXCONST_SGL(1.0f-0.25f);  /* used in smooth ChaosMeasure */
+#else
+  FIXP_DBL alpha_0 = FL2FXCONST_DBL(0.25f);       /* used in smooth ChaosMeasure */
+  FIXP_DBL alpha_1 = FL2FXCONST_DBL(1.0f-0.25f);  /* used in smooth ChaosMeasure */
+#endif
+  INT numberOfLines = sfbOffset[sfbCnt];
+
+  if (!usePns)
+    return;
+
+  C_ALLOC_SCRATCH_START(chaosMeasurePerLine, FIXP_DBL, (1024));
+  /* calculate chaos measure */
+  FDKaacEnc_CalculateChaosMeasure(spectrum,
+                        numberOfLines,
+                        chaosMeasurePerLine);
+
+  /* smooth ChaosMeasure */
+  for (j=1;j<numberOfLines;j++) {
+    FIXP_DBL tmp = fMultDiv2(alpha_1, chaosMeasurePerLine[j]);
+    chaosMeasurePerLine[j] = fMultAdd(tmp, alpha_0, chaosMeasurePerLine[j-1]);
+  }
+
+  FDKaacEnc_CalcSfbTonality(spectrum,
+                  sfbMaxScaleSpec,
+                  chaosMeasurePerLine,
+                  sfbTonality,
+                  sfbCnt,
+                  sfbOffset,
+                  sfbEnergyLD64);
+
+  C_ALLOC_SCRATCH_END(chaosMeasurePerLine, FIXP_DBL, (1024));
+}
+
+
+/*****************************************************************************
+
+    functionname: CalculateTonalityIndex
+    description:  computes tonality values out of unpredictability values
+                  limits range and computes log()
+    returns:
+    input:        ptr to energies, ptr to chaos measure values,
+                  number of sfb
+    output:       sfb wise tonality values
+
+*****************************************************************************/
+static void FDKaacEnc_CalcSfbTonality(FIXP_DBL      *RESTRICT spectrum,
+                            INT           *RESTRICT sfbMaxScaleSpec,
+                            FIXP_DBL      *RESTRICT chaosMeasure,
+                            FIXP_SGL      *RESTRICT sfbTonality,
+                            INT           sfbCnt,
+                            const INT     *RESTRICT sfbOffset,
+                            FIXP_DBL      *RESTRICT sfbEnergyLD64 )
+{
+    INT i, j;
+
+    for (i=0; i<sfbCnt; i++) {
+      FIXP_DBL chaosMeasureSfbLD64;
+      INT shiftBits = fixMax(0,sfbMaxScaleSpec[i] - 4);  /* max sfbWidth = 96 ; 2^7=128 => 7/2 = 4 (spc*spc) */
+
+      FIXP_DBL chaosMeasureSfb = FL2FXCONST_DBL(0.0);
+
+      /* calc chaosMeasurePerSfb */
+      for (j=(sfbOffset[i+1]-sfbOffset[i])-1; j>=0; j--) {
+        FIXP_DBL tmp = (*spectrum++)<<shiftBits;
+        FIXP_DBL lineNrg = fMultDiv2(tmp, tmp);
+        chaosMeasureSfb = fMultAddDiv2(chaosMeasureSfb, lineNrg, *chaosMeasure++);
+      }
+
+      /* calc tonalityPerSfb */
+      if (chaosMeasureSfb != FL2FXCONST_DBL(0.0))
+      {
+        /* add ld(convtone)/64 and 2/64 bec.fMultDiv2 */
+        chaosMeasureSfbLD64 = CalcLdData((chaosMeasureSfb)) - sfbEnergyLD64[i];
+        chaosMeasureSfbLD64 += FL2FXCONST_DBL(3.0f/64) - ((FIXP_DBL)(shiftBits)<<(DFRACT_BITS-6));
+
+        if (chaosMeasureSfbLD64 > FL2FXCONST_DBL(-0.0519051) )     /* > ld(0.05)+ld(2) */
+        {
+          if (chaosMeasureSfbLD64 <= FL2FXCONST_DBL(0.0) )
+		    sfbTonality[i] = FX_DBL2FX_SGL(fMultDiv2( chaosMeasureSfbLD64 , normlog ) << 7);
+          else
+            sfbTonality[i] = FL2FXCONST_SGL(0.0);
+        }
+        else
+          sfbTonality[i] = (FIXP_SGL)MAXVAL_SGL;
+      }
+      else
+        sfbTonality[i] = (FIXP_SGL)MAXVAL_SGL;
+    }
+}