/*
*
* \brief Initialize one low power transposer instance
*
*
*/
int
createLppTransposer (HANDLE_SBR_LPP_TRANS hLppTrans,
unsigned char highBandStartSb,
unsigned char *v_k_master,
unsigned char numMaster,
unsigned char usb,
unsigned char nCols,
unsigned char* noiseBandTable,
unsigned char noNoiseBands,
unsigned short fs,
unsigned char chan
)
{
HANDLE_SBR_LPP_TRANS hs;
COUNT_sub_start("createLppTransposer");
PTR_INIT(1);
hs = hLppTrans;
PTR_INIT(1);
hs->pSettings = &sbr_TransposerSettings;
MOVE(1);
hs->pSettings->nCols = nCols;
PTR_INIT(2); /* pointer for sbr_LpcFilterStatesReal[chan][0],
sbr_LpcFilterStatesReal[chan][1] */
MOVE(2);
hs->lpcFilterStatesReal[0] = sbr_LpcFilterStatesReal[chan][0];
hs->lpcFilterStatesReal[1] = sbr_LpcFilterStatesReal[chan][1];
#ifndef LP_SBR_ONLY
PTR_INIT(2); /* pointer for sbr_LpcFilterStatesImag[chan][0],
sbr_LpcFilterStatesImag[chan][1] */
MOVE(2);
hs->lpcFilterStatesImag[0] = sbr_LpcFilterStatesImag[chan][0];
hs->lpcFilterStatesImag[1] = sbr_LpcFilterStatesImag[chan][1];
#endif
BRANCH(1);
if (chan==0) {
MOVE(1);
hs->pSettings->nCols = nCols;
FUNC(9);
COUNT_sub_end();
return resetLppTransposer (hs,
0,
highBandStartSb,
v_k_master,
numMaster,
noiseBandTable,
noNoiseBands,
usb,
fs);
}
COUNT_sub_end();
return 0;
}
/*!
\brief resets sbr decoder structure
\return errorCode, 0 if successful
*/
SBR_ERROR
resetSbrDec (HANDLE_SBR_DEC hSbrDec,
HANDLE_SBR_HEADER_DATA hHeaderData,
HANDLE_SBR_PREV_FRAME_DATA hPrevFrameData,
const int useLP,
const int downsampleFac
)
{
SBR_ERROR sbrError = SBRDEC_OK;
int old_lsb = hSbrDec->SynthesisQMF.lsb;
int new_lsb = hHeaderData->freqBandData.lowSubband;
int l, startBand, stopBand, startSlot, size;
int source_scale, target_scale, delta_scale, target_lsb, target_usb, reserve;
FIXP_DBL maxVal;
/* overlapBuffer point to first (6) slots */
FIXP_DBL **OverlapBufferReal = hSbrDec->QmfBufferReal;
FIXP_DBL **OverlapBufferImag = hSbrDec->QmfBufferImag;
/* assign qmf time slots */
assignTimeSlots( hSbrDec, hHeaderData->numberTimeSlots * hHeaderData->timeStep, useLP);
resetSbrEnvelopeCalc (&hSbrDec->SbrCalculateEnvelope);
hSbrDec->SynthesisQMF.lsb = hHeaderData->freqBandData.lowSubband;
hSbrDec->SynthesisQMF.usb = fixMin((INT)hSbrDec->SynthesisQMF.no_channels, (INT)hHeaderData->freqBandData.highSubband);
hSbrDec->AnalysiscQMF.lsb = hSbrDec->SynthesisQMF.lsb;
hSbrDec->AnalysiscQMF.usb = hSbrDec->SynthesisQMF.usb;
/*
The following initialization of spectral data in the overlap buffer
is required for dynamic x-over or a change of the start-freq for 2 reasons:
1. If the lowband gets _wider_, unadjusted data would remain
2. If the lowband becomes _smaller_, the highest bands of the old lowband
must be cleared because the whitening would be affected
*/
startBand = old_lsb;
stopBand = new_lsb;
startSlot = hHeaderData->timeStep * (hPrevFrameData->stopPos - hHeaderData->numberTimeSlots);
size = fixMax(0,stopBand-startBand);
/* keep already adjusted data in the x-over-area */
if (!useLP) {
for (l=startSlot; l<hSbrDec->LppTrans.pSettings->overlap; l++) {
FDKmemclear(&OverlapBufferReal[l][startBand], size*sizeof(FIXP_DBL));
FDKmemclear(&OverlapBufferImag[l][startBand], size*sizeof(FIXP_DBL));
}
} else
for (l=startSlot; l<hSbrDec->LppTrans.pSettings->overlap ; l++) {
FDKmemclear(&OverlapBufferReal[l][startBand], size*sizeof(FIXP_DBL));
}
/*
reset LPC filter states
*/
startBand = fixMin(old_lsb,new_lsb);
stopBand = fixMax(old_lsb,new_lsb);
size = fixMax(0,stopBand-startBand);
FDKmemclear(&hSbrDec->LppTrans.lpcFilterStatesReal[0][startBand], size*sizeof(FIXP_DBL));
FDKmemclear(&hSbrDec->LppTrans.lpcFilterStatesReal[1][startBand], size*sizeof(FIXP_DBL));
if (!useLP) {
FDKmemclear(&hSbrDec->LppTrans.lpcFilterStatesImag[0][startBand], size*sizeof(FIXP_DBL));
FDKmemclear(&hSbrDec->LppTrans.lpcFilterStatesImag[1][startBand], size*sizeof(FIXP_DBL));
}
/*
Rescale already processed spectral data between old and new x-over frequency.
This must be done because of the separate scalefactors for lowband and highband.
*/
startBand = fixMin(old_lsb,new_lsb);
stopBand = fixMax(old_lsb,new_lsb);
if (new_lsb > old_lsb) {
/* The x-over-area was part of the highband before and will now belong to the lowband */
source_scale = hSbrDec->sbrScaleFactor.ov_hb_scale;
target_scale = hSbrDec->sbrScaleFactor.ov_lb_scale;
target_lsb = 0;
target_usb = old_lsb;
}
else {
/* The x-over-area was part of the lowband before and will now belong to the highband */
source_scale = hSbrDec->sbrScaleFactor.ov_lb_scale;
target_scale = hSbrDec->sbrScaleFactor.ov_hb_scale;
/* jdr: The values old_lsb and old_usb might be wrong because the previous frame might have been "upsamling". */
target_lsb = hSbrDec->SynthesisQMF.lsb;
target_usb = hSbrDec->SynthesisQMF.usb;
}
/* Shift left all samples of the x-over-area as much as possible
An unnecessary coarse scale could cause ov_lb_scale or ov_hb_scale to be
adapted and the accuracy in the next frame would seriously suffer! */
maxVal = maxSubbandSample( OverlapBufferReal,
(useLP) ? NULL : OverlapBufferImag,
startBand,
stopBand,
0,
startSlot);
reserve = CntLeadingZeros(maxVal)-1;
reserve = fixMin(reserve,DFRACT_BITS-1-source_scale);
rescaleSubbandSamples( OverlapBufferReal,
(useLP) ? NULL : OverlapBufferImag,
startBand,
stopBand,
0,
startSlot,
reserve);
source_scale += reserve;
delta_scale = target_scale - source_scale;
if (delta_scale > 0) { /* x-over-area is dominant */
delta_scale = -delta_scale;
startBand = target_lsb;
stopBand = target_usb;
if (new_lsb > old_lsb) {
/* The lowband has to be rescaled */
hSbrDec->sbrScaleFactor.ov_lb_scale = source_scale;
}
else {
/* The highband has be be rescaled */
hSbrDec->sbrScaleFactor.ov_hb_scale = source_scale;
}
}
FDK_ASSERT(startBand <= stopBand);
if (!useLP) {
for (l=0; l<startSlot; l++) {
scaleValues( OverlapBufferReal[l] + startBand, stopBand-startBand, delta_scale );
scaleValues( OverlapBufferImag[l] + startBand, stopBand-startBand, delta_scale );
}
} else
for (l=0; l<startSlot; l++) {
scaleValues( OverlapBufferReal[l] + startBand, stopBand-startBand, delta_scale );
}
/*
Initialize transposer and limiter
*/
sbrError = resetLppTransposer (&hSbrDec->LppTrans,
hHeaderData->freqBandData.lowSubband,
hHeaderData->freqBandData.v_k_master,
hHeaderData->freqBandData.numMaster,
hHeaderData->freqBandData.freqBandTableNoise,
hHeaderData->freqBandData.nNfb,
hHeaderData->freqBandData.highSubband,
hHeaderData->sbrProcSmplRate);
if (sbrError != SBRDEC_OK)
return sbrError;
sbrError = ResetLimiterBands ( hHeaderData->freqBandData.limiterBandTable,
&hHeaderData->freqBandData.noLimiterBands,
hHeaderData->freqBandData.freqBandTable[0],
hHeaderData->freqBandData.nSfb[0],
hSbrDec->LppTrans.pSettings->patchParam,
hSbrDec->LppTrans.pSettings->noOfPatches,
hHeaderData->bs_data.limiterBands);
return sbrError;
}
