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authorDave Burke <daveburke@google.com>2012-04-17 09:51:45 -0700
committerDave Burke <daveburke@google.com>2012-04-17 23:04:43 -0700
commit9bf37cc9712506b2483650c82d3c41152337ef7e (patch)
tree77db44e2bae06e3d144b255628be2b7a55c581d3 /libAACdec/src/aacdec_tns.cpp
parenta37315fe10ee143d6d0b28c19d41a476a23e63ea (diff)
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Fraunhofer AAC codec.
License boilerplate update to follow. Change-Id: I2810460c11a58b6d148d84673cc031f3685e79b5
Diffstat (limited to 'libAACdec/src/aacdec_tns.cpp')
-rw-r--r--libAACdec/src/aacdec_tns.cpp350
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diff --git a/libAACdec/src/aacdec_tns.cpp b/libAACdec/src/aacdec_tns.cpp
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+/***************************** MPEG-4 AAC Decoder **************************
+
+ (C) Copyright Fraunhofer IIS (2004)
+ 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(s): Josef Hoepfl
+ Description: temporal noise shaping tool
+
+ 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 "aacdec_tns.h"
+#include "aac_rom.h"
+#include "FDK_bitstream.h"
+#include "channelinfo.h"
+
+
+
+/*!
+ \brief Reset tns data
+
+ The function resets the tns data
+
+ \return none
+*/
+void CTns_Reset(CTnsData *pTnsData)
+{
+ /* Note: the following FDKmemclear should not be required. */
+ FDKmemclear(pTnsData->Filter, TNS_MAX_WINDOWS*TNS_MAXIMUM_FILTERS*sizeof(CFilter));
+ FDKmemclear(pTnsData->NumberOfFilters, TNS_MAX_WINDOWS*sizeof(UCHAR));
+ pTnsData->DataPresent = 0;
+ pTnsData->Active = 0;
+}
+
+void CTns_ReadDataPresentFlag(HANDLE_FDK_BITSTREAM bs, /*!< pointer to bitstream */
+ CTnsData *pTnsData) /*!< pointer to aac decoder channel info */
+{
+ pTnsData->DataPresent = (UCHAR) FDKreadBits(bs,1);
+}
+
+/*!
+ \brief Read tns data from bitstream
+
+ The function reads the elements for tns from
+ the bitstream.
+
+ \return none
+*/
+AAC_DECODER_ERROR CTns_Read(HANDLE_FDK_BITSTREAM bs,
+ CTnsData *pTnsData,
+ const CIcsInfo *pIcsInfo,
+ const UINT flags)
+{
+ UCHAR n_filt,order;
+ UCHAR length,coef_res,coef_compress;
+ UCHAR window;
+ UCHAR wins_per_frame = GetWindowsPerFrame(pIcsInfo);
+ UCHAR isLongFlag = IsLongBlock(pIcsInfo);
+ AAC_DECODER_ERROR ErrorStatus = AAC_DEC_OK;
+
+ if (!pTnsData->DataPresent) {
+ return ErrorStatus;
+ }
+
+ for (window = 0; window < wins_per_frame; window++)
+ {
+ pTnsData->NumberOfFilters[window] = n_filt = (UCHAR) FDKreadBits(bs, isLongFlag ? 2 : 1);
+
+ if (pTnsData->NumberOfFilters[window] > TNS_MAXIMUM_FILTERS){
+ pTnsData->NumberOfFilters[window] = n_filt = TNS_MAXIMUM_FILTERS;
+ }
+
+ if (n_filt)
+ {
+ int index;
+ UCHAR nextstopband;
+
+ coef_res = (UCHAR) FDKreadBits(bs,1);
+
+ nextstopband = GetScaleFactorBandsTotal(pIcsInfo);
+
+ for (index=0; index < n_filt; index++)
+ {
+ CFilter *filter = &pTnsData->Filter[window][index];
+
+ length = (UCHAR)FDKreadBits(bs, isLongFlag ? 6 : 4);
+
+ if (length > nextstopband){
+ length = nextstopband;
+ }
+
+ filter->StartBand = nextstopband - length;
+ filter->StopBand = nextstopband;
+ nextstopband = filter->StartBand;
+
+ {
+ filter->Order = order = (UCHAR) FDKreadBits(bs, isLongFlag ? 5 : 3);
+ }
+
+ if (filter->Order > TNS_MAXIMUM_ORDER){
+ filter->Order = order = TNS_MAXIMUM_ORDER;
+ }
+
+ if (order)
+ {
+ UCHAR coef,s_mask;
+ UCHAR i;
+ SCHAR n_mask;
+ static const UCHAR sgn_mask[] = { 0x2, 0x4, 0x8 };
+ static const SCHAR neg_mask[] = { ~0x3, ~0x7, ~0xF };
+
+ filter->Direction = FDKreadBits(bs,1) ? -1 : 1;
+
+ coef_compress = (UCHAR) FDKreadBits(bs,1);
+
+ filter->Resolution = coef_res + 3;
+
+ s_mask = sgn_mask[coef_res + 1 - coef_compress];
+ n_mask = neg_mask[coef_res + 1 - coef_compress];
+
+ for (i=0; i < order; i++)
+ {
+ coef = (UCHAR) FDKreadBits(bs,filter->Resolution - coef_compress);
+ filter->Coeff[i] = (coef & s_mask) ? (coef | n_mask) : coef;
+ }
+ }
+ }
+ }
+ }
+
+ pTnsData->Active = 1;
+
+ return ErrorStatus;
+}
+
+
+static void CTns_Filter (FIXP_DBL *spec, int size, int inc, FIXP_TCC coeff [], int order)
+{
+ // - Simple all-pole filter of order "order" defined by
+ // y(n) = x(n) - a(2)*y(n-1) - ... - a(order+1)*y(n-order)
+ //
+ // - The state variables of the filter are initialized to zero every time
+ //
+ // - The output data is written over the input data ("in-place operation")
+ //
+ // - An input vector of "size" samples is processed and the index increment
+ // to the next data sample is given by "inc"
+
+ int i,j,N;
+ FIXP_DBL *pSpec;
+ FIXP_DBL maxVal=FL2FXCONST_DBL(0.0);
+ INT s;
+
+ FDK_ASSERT(order <= TNS_MAXIMUM_ORDER);
+ C_ALLOC_SCRATCH_START(state, FIXP_DBL, TNS_MAXIMUM_ORDER);
+ FDKmemclear(state, order*sizeof(FIXP_DBL));
+
+ for (i=0; i<size; i++) {
+ maxVal = fixMax(maxVal,fixp_abs(spec[i]));
+ }
+
+ if ( maxVal > FL2FXCONST_DBL(0.03125*0.70710678118) )
+ s = fixMax(CntLeadingZeros(maxVal)-6,0);
+ else
+ s = fixMax(CntLeadingZeros(maxVal)-5,0);
+
+ s = fixMin(s,2);
+ s = s-1;
+
+ if (inc == -1)
+ pSpec = &spec[size - 1];
+ else
+ pSpec = &spec[0];
+
+ FIXP_TCC *pCoeff;
+
+#define FIRST_PART_FLTR \
+ FIXP_DBL x, *pState = state; \
+ pCoeff = coeff; \
+ \
+ if (s < 0) \
+ x = (pSpec [0]>>1) + fMultDiv2 (*pCoeff++, pState [0]) ; \
+ else \
+ x = (pSpec [0]<<s) + fMultDiv2 (*pCoeff++, pState [0]) ;
+
+#define INNER_FLTR_INLINE \
+ x = fMultAddDiv2 (x, *pCoeff, pState [1]); \
+ pState [0] = pState [1] - (fMultDiv2 (*pCoeff++, x) <<2) ; \
+ pState++;
+
+#define LAST_PART_FLTR \
+ if (s < 0) \
+ *pSpec = x << 1; \
+ else \
+ *pSpec = x >> s; \
+ *pState =(-x) << 1; \
+ pSpec += inc ;
+
+
+ if (order>8)
+ {
+ N = (order-1)&7;
+
+ for (i = size ; i != 0 ; i--)
+ {
+ FIRST_PART_FLTR
+
+ for (j = N; j > 0 ; j--) { INNER_FLTR_INLINE }
+
+ INNER_FLTR_INLINE INNER_FLTR_INLINE INNER_FLTR_INLINE INNER_FLTR_INLINE
+ INNER_FLTR_INLINE INNER_FLTR_INLINE INNER_FLTR_INLINE INNER_FLTR_INLINE
+
+ LAST_PART_FLTR
+ }
+
+ } else if (order>4) {
+
+ N = (order-1)&3;
+
+ for (i = size ; i != 0 ; i--)
+ {
+ FIRST_PART_FLTR
+ for (j = N; j > 0 ; j--) { INNER_FLTR_INLINE }
+
+ INNER_FLTR_INLINE INNER_FLTR_INLINE INNER_FLTR_INLINE INNER_FLTR_INLINE
+
+ LAST_PART_FLTR
+ }
+
+ } else {
+
+ N = order-1;
+
+ for (i = size ; i != 0 ; i--)
+ {
+ FIRST_PART_FLTR
+
+ for (j = N; j > 0 ; j--) { INNER_FLTR_INLINE }
+
+ LAST_PART_FLTR
+ }
+ }
+
+ C_ALLOC_SCRATCH_END(state, FIXP_DBL, TNS_MAXIMUM_ORDER);
+}
+
+/*!
+ \brief Apply tns to spectral lines
+
+ The function applies the tns to the spectrum,
+
+ \return none
+*/
+void CTns_Apply (
+ CTnsData *RESTRICT pTnsData, /*!< pointer to aac decoder info */
+ const CIcsInfo *pIcsInfo,
+ SPECTRAL_PTR pSpectralCoefficient,
+ const SamplingRateInfo *pSamplingRateInfo,
+ const INT granuleLength
+ )
+{
+ int window,index,start,stop,size;
+
+
+ if (pTnsData->Active)
+ {
+ C_AALLOC_SCRATCH_START(coeff, FIXP_TCC, TNS_MAXIMUM_ORDER);
+
+ for (window=0; window < GetWindowsPerFrame(pIcsInfo); window++)
+ {
+ FIXP_DBL *pSpectrum = SPEC(pSpectralCoefficient, window, granuleLength);
+
+ for (index=0; index < pTnsData->NumberOfFilters[window]; index++)
+ {
+ CFilter *RESTRICT filter = &pTnsData->Filter[window][index];
+
+ if (filter->Order > 0)
+ {
+ FIXP_TCC *pCoeff;
+ int tns_max_bands;
+
+ pCoeff = &coeff[filter->Order-1];
+ if (filter->Resolution == 3)
+ {
+ int i;
+ for (i=0; i < filter->Order; i++)
+ *pCoeff-- = FDKaacDec_tnsCoeff3[filter->Coeff[i]+4];
+ }
+ else
+ {
+ int i;
+ for (i=0; i < filter->Order; i++)
+ *pCoeff-- = FDKaacDec_tnsCoeff4[filter->Coeff[i]+8];
+ }
+
+ switch (granuleLength) {
+ case 480:
+ tns_max_bands = tns_max_bands_tbl_480[pSamplingRateInfo->samplingRateIndex-3];
+ break;
+ case 512:
+ tns_max_bands = tns_max_bands_tbl_512[pSamplingRateInfo->samplingRateIndex-3];
+ break;
+ default:
+ tns_max_bands = GetMaximumTnsBands(pIcsInfo, pSamplingRateInfo->samplingRateIndex);
+ break;
+ }
+
+ start = fixMin( fixMin(filter->StartBand, tns_max_bands),
+ GetScaleFactorBandsTransmitted(pIcsInfo) );
+
+ start = GetScaleFactorBandOffsets(pIcsInfo, pSamplingRateInfo)[start];
+
+ stop = fixMin( fixMin(filter->StopBand, tns_max_bands),
+ GetScaleFactorBandsTransmitted(pIcsInfo) );
+
+ stop = GetScaleFactorBandOffsets(pIcsInfo, pSamplingRateInfo)[stop];
+
+ size = stop - start;
+
+ if (size > 0) {
+ CTns_Filter(&pSpectrum[start],
+ size,
+ filter->Direction,
+ coeff,
+ filter->Order );
+ }
+ }
+ }
+ }
+ C_AALLOC_SCRATCH_END(coeff, FIXP_TCC, TNS_MAXIMUM_ORDER);
+ }
+
+}