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/******************************** 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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