From 9bf37cc9712506b2483650c82d3c41152337ef7e Mon Sep 17 00:00:00 2001
From: Dave Burke <daveburke@google.com>
Date: Tue, 17 Apr 2012 09:51:45 -0700
Subject: Fraunhofer AAC codec.

License boilerplate update to follow.

Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5
---
 libAACenc/src/tonality.cpp | 147 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 147 insertions(+)
 create mode 100644 libAACenc/src/tonality.cpp

(limited to 'libAACenc/src/tonality.cpp')

diff --git a/libAACenc/src/tonality.cpp b/libAACenc/src/tonality.cpp
new file mode 100644
index 0000000..54b4b6e
--- /dev/null
+++ b/libAACenc/src/tonality.cpp
@@ -0,0 +1,147 @@
+/******************************** MPEG Audio Encoder **************************
+
+                       (c) copyright Fraunhofer IIS (1996)
+                               All Rights Reserved
+
+    Please be advised that this software and/or program delivery is
+    Confidential Information of Fraunhofer and subject to and covered by the
+
+    Fraunhofer IIS Software Evaluation Agreement
+    between Google Inc. and  Fraunhofer
+    effective and in full force since March 1, 2012.
+
+    You may use this software and/or program only under the terms and
+    conditions described in the above mentioned Fraunhofer IIS Software
+    Evaluation Agreement. Any other and/or further use requires a separate agreement.
+
+
+   $Id$
+   author:   M. Werner
+   contents/description: Convert chaos measure to the tonality index
+
+   This software and/or program is protected by copyright law and international
+   treaties. Any reproduction or distribution of this software and/or program,
+   or any portion of it, may result in severe civil and criminal penalties, and
+   will be prosecuted to the maximum extent possible under law.
+
+******************************************************************************/
+
+#include "tonality.h"
+#include "chaosmeasure.h"
+
+/*static const FIXP_SGL maxtone  =  FL2FXCONST_SGL(0.5);*/
+/*static const FIXP_SGL mintone  =  FL2FXCONST_SGL(0.05);*/
+/*static const float convtone =  2.0f;*/           /* 1.0/mintone               */
+
+/* -1.0/log(maxtone/mintone) */
+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;
+    }
+}
-- 
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