/* * * \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; }