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/******************************** MPEG Audio Encoder **************************
(C) Copyright Fraunhofer IIS (1999)
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.
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.
$Id$
Initial author: M.Werner
contents/description: Short block grouping
******************************************************************************/
#include "psy_const.h"
#include "interface.h"
/*
* this routine does not work in-place
*/
void
FDKaacEnc_groupShortData(FIXP_DBL *mdctSpectrum, /* in-out */
SFB_THRESHOLD *sfbThreshold, /* in-out */
SFB_ENERGY *sfbEnergy, /* in-out */
SFB_ENERGY *sfbEnergyMS, /* in-out */
SFB_ENERGY *sfbSpreadEnergy,
const INT sfbCnt,
const INT sfbActive,
const INT *sfbOffset,
const FIXP_DBL *sfbMinSnrLdData,
INT *groupedSfbOffset, /* out */
INT *maxSfbPerGroup, /* out */
FIXP_DBL *groupedSfbMinSnrLdData,
const INT noOfGroups,
const INT *groupLen,
const INT granuleLength)
{
INT i,j;
INT line; /* counts through lines */
INT sfb; /* counts through scalefactor bands */
INT grp; /* counts through groups */
INT wnd; /* counts through windows in a group */
INT offset; /* needed in sfbOffset grouping */
INT highestSfb;
INT granuleLength_short = granuleLength/TRANS_FAC;
/* for short blocks: regroup spectrum and */
/* group energies and thresholds according to grouping */
C_ALLOC_SCRATCH_START(tmpSpectrum, FIXP_DBL, (1024));
/* calculate maxSfbPerGroup */
highestSfb = 0;
for (wnd = 0; wnd < TRANS_FAC; wnd++)
{
for (sfb = sfbActive-1; sfb >= highestSfb; sfb--)
{
for (line = sfbOffset[sfb+1]-1; line >= sfbOffset[sfb]; line--)
{
if ( mdctSpectrum[wnd*granuleLength_short+line] != FL2FXCONST_SPC(0.0) ) break; /* this band is not completely zero */
}
if (line >= sfbOffset[sfb]) break; /* this band was not completely zero */
}
highestSfb = fixMax(highestSfb, sfb);
}
highestSfb = highestSfb > 0 ? highestSfb : 0;
*maxSfbPerGroup = highestSfb+1;
/* calculate groupedSfbOffset */
i = 0;
offset = 0;
for (grp = 0; grp < noOfGroups; grp++)
{
for (sfb = 0; sfb < sfbActive+1; sfb++)
{
groupedSfbOffset[i++] = offset + sfbOffset[sfb] * groupLen[grp];
}
i += sfbCnt-sfb;
offset += groupLen[grp] * granuleLength_short;
}
groupedSfbOffset[i++] = granuleLength;
/* calculate groupedSfbMinSnr */
i = 0;
for (grp = 0; grp < noOfGroups; grp++)
{
for (sfb = 0; sfb < sfbActive; sfb++)
{
groupedSfbMinSnrLdData[i++] = sfbMinSnrLdData[sfb];
}
i += sfbCnt-sfb;
}
/* sum up sfbThresholds */
wnd = 0;
i = 0;
for (grp = 0; grp < noOfGroups; grp++)
{
for (sfb = 0; sfb < sfbActive; sfb++)
{
FIXP_DBL thresh = sfbThreshold->Short[wnd][sfb];
for (j=1; j<groupLen[grp]; j++)
{
thresh += sfbThreshold->Short[wnd+j][sfb];
}
sfbThreshold->Long[i++] = thresh;
}
i += sfbCnt-sfb;
wnd += groupLen[grp];
}
/* sum up sfbEnergies left/right */
wnd = 0;
i = 0;
for (grp = 0; grp < noOfGroups; grp++)
{
for (sfb = 0; sfb < sfbActive; sfb++)
{
FIXP_DBL energy = sfbEnergy->Short[wnd][sfb];
for (j=1; j<groupLen[grp]; j++)
{
energy += sfbEnergy->Short[wnd+j][sfb];
}
sfbEnergy->Long[i++] = energy;
}
i += sfbCnt-sfb;
wnd += groupLen[grp];
}
/* sum up sfbEnergies mid/side */
wnd = 0;
i = 0;
for (grp = 0; grp < noOfGroups; grp++)
{
for (sfb = 0; sfb < sfbActive; sfb++)
{
FIXP_DBL energy = sfbEnergyMS->Short[wnd][sfb];
for (j=1; j<groupLen[grp]; j++)
{
energy += sfbEnergyMS->Short[wnd+j][sfb];
}
sfbEnergyMS->Long[i++] = energy;
}
i += sfbCnt-sfb;
wnd += groupLen[grp];
}
/* sum up sfbSpreadEnergies */
wnd = 0;
i = 0;
for (grp = 0; grp < noOfGroups; grp++)
{
for (sfb = 0; sfb < sfbActive; sfb++)
{
FIXP_DBL energy = sfbSpreadEnergy->Short[wnd][sfb];
for (j=1; j<groupLen[grp]; j++)
{
energy += sfbSpreadEnergy->Short[wnd+j][sfb];
}
sfbSpreadEnergy->Long[i++] = energy;
}
i += sfbCnt-sfb;
wnd += groupLen[grp];
}
/* re-group spectrum */
wnd = 0;
i = 0;
for (grp = 0; grp < noOfGroups; grp++)
{
for (sfb = 0; sfb < sfbActive; sfb++)
{
int width = sfbOffset[sfb+1]-sfbOffset[sfb];
FIXP_DBL *pMdctSpectrum = &mdctSpectrum[sfbOffset[sfb]] + wnd*granuleLength_short;
for (j = 0; j < groupLen[grp]; j++)
{
FIXP_DBL *pTmp = pMdctSpectrum;
for (line = width; line > 0; line--)
{
tmpSpectrum[i++] = *pTmp++;
}
pMdctSpectrum += granuleLength_short;
}
}
i += (groupLen[grp]*(sfbOffset[sfbCnt]-sfbOffset[sfb]));
wnd += groupLen[grp];
}
FDKmemcpy(mdctSpectrum, tmpSpectrum, granuleLength*sizeof(FIXP_DBL));
C_ALLOC_SCRATCH_END(tmpSpectrum, FIXP_DBL, (1024))
}
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