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512 lines
12 KiB
C++
512 lines
12 KiB
C++
/* $Header: /cvs/root/winamp/vlb/longblock.cpp,v 1.2 2011/06/13 02:06:03 audiodsp Exp $ */
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/***************************************************************************\
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*
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* Copyright 2000-2002 Dolby Laboratories, Inc. All Rights
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* Reserved. Do not copy. Do not distribute.
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* Confidential information.
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*
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* (C) copyright Fraunhofer - IIS (1998)
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* All Rights Reserved
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*
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* filename: longblock.cpp
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* project : MPEG-2 AAC Decoder
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* contents/description: long window sequence object
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*
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* $Header: /cvs/root/winamp/vlb/longblock.cpp,v 1.2 2011/06/13 02:06:03 audiodsp Exp $
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*
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\***************************************************************************/
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#include <math.h> // pow()
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#include "block.h"
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#include "bitstream.h"
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#include "channelinfo.h"
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#include "overlapadd.h"
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#ifdef MAIN_PROFILE
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#include "prediction.h"
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#endif
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// ctor/dtor
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CLongBlock::CLongBlock (CChannelInfo &info)
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: CBlock (info)
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{
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m_SectBits = 5 ;
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}
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CLongBlock::~CLongBlock ()
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{
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}
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// low-level access
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float *CLongBlock::AccessSpectralData (int /* window = 0 */)
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{
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return m_SpectralCoefficient ;
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}
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int *CLongBlock::AccessCodeBooks (int /* group */)
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{
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return m_CodeBook ;
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}
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int *CLongBlock::AccessScaleFactors (int /* group */)
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{
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return m_ScaleFactor ;
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}
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// readers
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#include<stdio.h>
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#include<conio.h>
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#include<stdlib.h>
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void CLongBlock::ReadSectionData (CDolbyBitStream &bs)
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{
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CVLBBitSequence sect_cb (4) ;
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CVLBBitSequence sect_len_incr (m_SectBits) ;
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int sect_esc_val = (1 << m_SectBits) - 1 ;
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int band ; // msdev not ansi
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//Section Information:
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int iNumberOfSections;
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iNumberOfSections=0;
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sSectionInfoStruct.aiSectionCount[0]=0;
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sSectionInfoStruct.aaiSectionStart[0][0]=0;
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for (band = 0 ; band < m_IcsInfo.GetScaleFactorBandsTransmitted () ; )
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{
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sect_cb.Read (bs) ;
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sect_len_incr.Read (bs) ;
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int sect_len = 0 ;
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while (sect_len_incr == sect_esc_val)
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{
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sect_len += sect_esc_val ;
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sect_len_incr.Read (bs) ;
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}
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sect_len += sect_len_incr ;
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for (int top = band + sect_len ; band < top ; band++)
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{
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m_CodeBook [band] = sect_cb ;
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if ((m_CodeBook [band] == BOOKSCL) ||
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(m_CodeBook [band] == RESERVED_HCB)
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)
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{
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throw EInvalidCodeBook () ;
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}
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}
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sSectionInfoStruct.aaiSectionCodebooks[0][iNumberOfSections]=sect_cb;
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sSectionInfoStruct.aaiSectionStart[0][iNumberOfSections+1]=band;
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sSectionInfoStruct.aaiSectionEnd[0][iNumberOfSections]=band;
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sSectionInfoStruct.aiSectionCount[0]++;
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iNumberOfSections++;
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}
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if(band < m_IcsInfo.GetScaleFactorBandsTotal() && m_IcsInfo.GetScaleFactorBandsTransmitted()){
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sSectionInfoStruct.aaiSectionCodebooks[0][iNumberOfSections]=ZERO_HCB;
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sSectionInfoStruct.aaiSectionEnd[0][iNumberOfSections]= m_IcsInfo.GetScaleFactorBandsTotal ();
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sSectionInfoStruct.aiSectionCount[0]++;
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iNumberOfSections++;
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}
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for ( ; band < m_IcsInfo.GetScaleFactorBandsTotal () ; band++)
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{
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m_CodeBook [band] = ZERO_HCB ;
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}
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}
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void CLongBlock::ReadScaleFactorData (CDolbyBitStream &bs, const int global_gain)
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{
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const CodeBookDescription *hcb = &HuffmanCodeBooks [BOOKSCL] ;
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int factor = global_gain ;
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int position = 0 ;
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int temp ;
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for (int band = 0 ; band < m_IcsInfo.GetScaleFactorBandsTransmitted () ; band++)
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{
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switch (m_CodeBook [band])
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{
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case ZERO_HCB : // zero book
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m_ScaleFactor [band] = 0 ;
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break ;
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default : // regular scale factor
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temp = DecodeHuffmanWord (bs, hcb->CodeBook) ;
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factor += temp - 60 ; // MIDFAC 1.5 dB
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m_ScaleFactor [band] = factor - 100 ;
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break ;
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case INTENSITY_HCB : // intensity steering
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case INTENSITY_HCB2 :
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temp = DecodeHuffmanWord (bs, hcb->CodeBook) ;
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position += temp - 60 ;
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m_ScaleFactor [band] = position - 100 ;
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#ifdef MAIN_PROFILE
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// use of intensity stereo overrides prediction_used mask
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m_IcsInfo.DeactivatePrediction (band) ;
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#endif
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break ;
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}
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}
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}
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void CLongBlock::ReadSpectralData (CDolbyBitStream &bs)
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{
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int QuantizedCoef [MaximumBins] ;
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int index, band ; // msdev for scoping not ansi
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for (index = 0 ; index < MaximumBins ; index++)
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{
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QuantizedCoef [index] = 0 ;
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}
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const int *BandOffsets = m_IcsInfo.GetScaleFactorBandOffsets () ;
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for (band = 0 ; band < m_IcsInfo.GetScaleFactorBandsTransmitted () ; band++)
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{
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if ((m_CodeBook [band] == ZERO_HCB) ||
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(m_CodeBook [band] == INTENSITY_HCB) ||
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(m_CodeBook [band] == INTENSITY_HCB2)
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)
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continue ;
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const CodeBookDescription *hcb = &HuffmanCodeBooks [m_CodeBook [band]] ;
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int step = 0 ;
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for (index = BandOffsets [band] ; index < BandOffsets [band + 1] ; index += step)
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{
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step = UnpackIndex (DecodeHuffmanWord (bs, hcb->CodeBook), &QuantizedCoef [index], hcb) ;
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if (!hcb->IsSigned)
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{
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for (int i = 0 ; i < step ; i++)
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{
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if (QuantizedCoef [index + i])
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{
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if (bs.Get (1)) // sign bit
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{
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QuantizedCoef [index + i] = -QuantizedCoef [index + i] ;
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}
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}
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}
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}
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if (m_CodeBook [band] == ESCBOOK)
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{
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QuantizedCoef [index] = GetEscape (bs, QuantizedCoef [index]) ;
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QuantizedCoef [index + 1] = GetEscape (bs, QuantizedCoef [index + 1]) ;
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}
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}
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}
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m_PulseData.Apply (m_IcsInfo, QuantizedCoef) ;
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// dequantize and apply scalefactors
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for (index = 0, band = 0 ; band < m_IcsInfo.GetScaleFactorBandsTransmitted () ; band++)
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{
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float factor = static_cast<float>(m_ScaleFactor [band]) ;
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if ((factor >= 0) && (factor < ExpTableSize))
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{
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factor = m_ExpTable [m_ScaleFactor [band]] ;
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}
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else
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{
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if (m_ScaleFactor [band] == -100)
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{
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for (index = BandOffsets [band] ; index < BandOffsets [band + 1] ; index++)
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{
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m_SpectralCoefficient [index] = 0.0F ;
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}
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continue ;
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}
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factor = static_cast<float>(pow (2.0F, 0.25F * factor)) ;
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}
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for (index = BandOffsets [band] ; index < BandOffsets [band + 1] ; index++)
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{
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m_SpectralCoefficient [index] = InverseQuantize (QuantizedCoef [index]) * factor ;
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}
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}
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// zero out spectral data beyond max_sfb
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// index is now first bin of max_sfb+1
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for ( ; index < MaximumBins ; index++)
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{
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m_SpectralCoefficient [index] = 0.0F ;
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}
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}
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void CLongBlock::ApplyWindowFunction (COverlapAddBuffer &Previous)
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{
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int i ;
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switch (m_IcsInfo.GetWindowSequence ())
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{
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case CChannelInfo::OnlyLongSequence :
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#if defined (WIN32) && defined (_M_IX86)
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PentiumWindow (m_SpectralCoefficient, m_LongWindow [Previous.GetWindowShape ()], m_LongWindow [m_IcsInfo.GetWindowShape ()]) ;
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#else
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for (i = 0 ; i < 1024 ; i++)
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{
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m_SpectralCoefficient [i] *= m_LongWindow [Previous.GetWindowShape ()][i] ;
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m_SpectralCoefficient [1024 + i] *= m_LongWindow [m_IcsInfo.GetWindowShape ()][1023 - i] ;
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}
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#endif
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break ;
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case CChannelInfo::LongStartSequence :
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for (i = 0 ; i < 1024 ; i++)
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{
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m_SpectralCoefficient [i] *= m_LongWindow [Previous.GetWindowShape ()][i] ;
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}
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for (i = 0 ; i < 128 ; i++)
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{
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m_SpectralCoefficient [1472 + i] *= m_ShortWindow [m_IcsInfo.GetWindowShape ()][127 - i] ;
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}
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for (i = 1600 ; i < 2048 ; i++)
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{
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m_SpectralCoefficient [i] = 0.0F ;
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}
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break ;
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case CChannelInfo::LongStopSequence :
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for (i = 0 ; i < 448 ; i++)
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{
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m_SpectralCoefficient [i] = 0.0F ;
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}
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for (i = 0 ; i < 128 ; i++)
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{
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m_SpectralCoefficient [448 + i] *= m_ShortWindow [Previous.GetWindowShape ()][i] ;
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}
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for (i = 0 ; i < 1024 ; i++)
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{
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m_SpectralCoefficient [1024 + i] *= m_LongWindow [m_IcsInfo.GetWindowShape ()][1023 - i] ;
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}
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break ;
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}
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Previous.SetWindowShape (m_IcsInfo.GetWindowShape ()) ;
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}
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void CLongBlock::FrequencyToTime_Fast (COverlapAddBuffer &Previous)
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{
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InverseTransform (m_SpectralCoefficient) ;
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ApplyWindowFunction (Previous) ;
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#if defined (WIN32) && defined (_M_IX86)
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PentiumOverlap (m_Output, m_SpectralCoefficient, Previous.AccessBuffer (), 1) ;
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#else
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for (int i = 0 ; i < 1024 ; i++)
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{
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// add first half and old data
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m_Output[i] = m_SpectralCoefficient [i] + Previous [i] ;
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// store second half as old data
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Previous [i] = m_SpectralCoefficient [1024 + i] ;
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}
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#endif
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}
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void CLongBlock::FrequencyToTime (COverlapAddBuffer &Previous, float Output [], const int stride)
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{
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InverseTransform (m_SpectralCoefficient) ;
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ApplyWindowFunction (Previous) ;
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for (int i = 0 ; i < 1024 ; i++)
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{
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// add first half and old data
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Output [i * stride] = m_SpectralCoefficient [i] + Previous [i] ;
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// store second half as old data
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Previous [i] = m_SpectralCoefficient [1024 + i] ;
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}
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}
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void CLongBlock::FrequencyToTime (COverlapAddBuffer &Previous)
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{
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InverseTransform (m_SpectralCoefficient) ;
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ApplyWindowFunction (Previous) ;
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for (int i = 0 ; i < 1024 ; i++)
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{
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m_Output[i]=m_SpectralCoefficient [i] + Previous [i] ;
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Previous [i] = m_SpectralCoefficient [1024 + i] ;
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}
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}
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void CLongBlock::ApplyEqualizationMask (float Mask [])
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{
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for (int i = 0 ; i < EqualizationMaskLength ; i++)
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{
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for (int j = 0 ; j < (MaximumBins / EqualizationMaskLength) ; j++)
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{
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m_SpectralCoefficient [(MaximumBins / EqualizationMaskLength) * i + j] *= Mask [i] ;
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}
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}
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}
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#if defined (WIN32) && defined (_M_IX86)
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#pragma message (__FILE__": using x86 inline assembler")
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// this CBlock method goes here, because we'd prefer it to be inlined
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// with CLongBlock. not all compilers support inter-module optimizations.
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void CBlock::PentiumOverlap (float output [], float spec [], float prev [], unsigned int stride)
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{
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const float minval = -32767.0F ;
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__asm
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{
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shl stride, 2 // stride *= sizeof(float)
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mov esi, dword ptr [output] // esi is pcm output pointer
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mov ebx, 0x00 // ebx is buffer index
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mov edx, dword ptr [spec]
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mov ecx, dword ptr [prev]
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entry:
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fld dword ptr [edx + ebx*4] // get: spec [i]
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fadd dword ptr [ecx + ebx*4] // get: spec [i] + prev [i]
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mov eax, dword ptr [edx + ebx*4 + 0x1000] // get: spec [1024 + i]
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mov dword ptr [ecx + ebx*4],eax // put: prev [i] = spec [1024 + i]
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fst dword ptr [esi] // put: output [i] = spec [i] + prev [i]
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add esi, stride
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fstp st(0)
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inc ebx
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cmp ebx, 1024
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jne entry
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}
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}
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void CLongBlock::PentiumWindow (float spec [], const float prev [], const float curr [])
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{
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__asm
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{
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mov ebx, 0x0100
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mov edx, dword ptr [spec]
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mov esi, dword ptr [curr]
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mov ecx, dword ptr [prev]
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add esi, 4 * 0x03FC
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entry:
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// previous shape
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fldz
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fld dword ptr [edx]
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fmul dword ptr [ecx]
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fxch
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fld dword ptr [edx + 0x04]
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fmul dword ptr [ecx + 0x04]
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fxch
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fld dword ptr [edx + 0x08]
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fmul dword ptr [ecx + 0x08]
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fxch
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fld dword ptr [edx + 0x0C]
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fmul dword ptr [ecx + 0x0C]
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fxch st(4)
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fstp dword ptr [edx]
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fxch st(2)
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fstp dword ptr [edx + 0x04]
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fstp dword ptr [edx + 0x08]
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fxch
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fstp dword ptr [edx + 0x0C]
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// current shape
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fld dword ptr [edx + 0x1000]
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fmul dword ptr [esi + 0x0C]
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fxch
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fld dword ptr [edx + 0x1004]
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fmul dword ptr [esi + 0x08]
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fxch
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fld dword ptr [edx + 0x1008]
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fmul dword ptr [esi + 0x04]
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fxch
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fld dword ptr [edx + 0x100C]
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fmul dword ptr [esi]
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fxch st(4)
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fstp dword ptr [edx + 0x1000]
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fxch st(2)
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fstp dword ptr [edx + 0x1004]
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fstp dword ptr [edx + 0x1008]
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fstp st(0)
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fstp dword ptr [edx + 0x100C]
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add edx, 0x10
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sub esi, 0x10
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add ecx, 0x10
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dec ebx
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jne entry
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}
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}
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#endif
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