344 lines
8.5 KiB
C++
344 lines
8.5 KiB
C++
/* $Header: /cvs/root/winamp/vlb/block.h,v 1.2 2011/06/13 02:06:02 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: block.h
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* project : MPEG-2 AAC Decoder
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* contents/description: Defines abstract base class CBlock
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*
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* $Header: /cvs/root/winamp/vlb/block.h,v 1.2 2011/06/13 02:06:02 audiodsp Exp $
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*
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\***************************************************************************/
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#ifndef __BLOCK_H__
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#define __BLOCK_H__
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#include "exception.h"
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#include "pulsedata.h"
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#include "tns.h"
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#include "DolbyPayload.h"
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class CChannelInfo ;
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class CDolbyBitStream ;
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class COverlapAddBuffer ;
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#ifdef MAIN_PROFILE
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class CPrediction ;
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#endif
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/** Spectral Data For Current Frame.
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This abstract base class defines the interface and some common helper functions
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for the classes holding the spectral coefficients of the current frame.
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*/
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class CBlock
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{
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// allow tools to call AccessXXX() methods
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friend class CJointStereo ;
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#ifdef MAIN_PROFILE
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friend class CPrediction ;
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#endif
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friend class CTns ;
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friend class CCouplingChannel ;
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friend CBlock &operator+= (CBlock &, CBlock &) ;
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public :
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CBlock (CChannelInfo &) ;
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virtual ~CBlock () ;
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void Read (CDolbyBitStream &bs, const int global_gain) ;
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virtual void ApplyTools (void) ;
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virtual void FrequencyToTime (COverlapAddBuffer &, float [], const int) = 0 ;
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//MSV
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virtual void FrequencyToTime_Fast (COverlapAddBuffer&) = 0 ;
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virtual void FrequencyToTime (COverlapAddBuffer &) = 0;
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virtual SECTION_INFORMATION_STRUCT* GetSectionInfo() = 0;
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// gimmicks
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virtual void ApplyEqualizationMask (float Mask []) = 0 ;
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// // //
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enum
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{
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EqualizationMaskLength = 16,
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ZERO_HCB = 0,
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ESCBOOK = 11,
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NSPECBOOKS = ESCBOOK + 1,
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BOOKSCL = NSPECBOOKS,
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RESERVED_HCB = 13,
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INTENSITY_HCB2 = 14,
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INTENSITY_HCB = 15,
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InverseQuantTableSize = 1024,
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ExpTableSize = 128,
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HuffmanBits = 4,
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HuffmanEntries = (1 << HuffmanBits)
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} ;
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virtual float *AccessSpectralData (int window = 0) = 0 ;
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virtual float *AccessOutput() =0;
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virtual short *AccessShortOutput() =0;
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short FloatToShort (float pcm)
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{
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if (pcm < 0.0F)
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{
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pcm = -pcm ;
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pcm += 0.5F ;
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return (pcm > 32768.0F) ? -32768 : -((short) pcm) ;
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}
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else
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{
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pcm += 0.5F ;
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return (pcm > 32767.0F) ? 32767 : (short) pcm ;
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}
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}
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protected :
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// overridable readers
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virtual void ReadSectionData (CDolbyBitStream &bs) = 0 ;
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virtual void ReadScaleFactorData (CDolbyBitStream &bs, const int global_gain) = 0 ;
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virtual void ReadSpectralData (CDolbyBitStream &bs) = 0 ;
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// tools interface
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virtual int *AccessCodeBooks (int group) = 0 ;
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virtual int *AccessScaleFactors (int group) = 0 ;
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//
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CChannelInfo &m_IcsInfo ;
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CPulseData m_PulseData ;
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CTns m_Tns ;
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// Huffman Decoding
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typedef struct tagCodeBookDescription
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{
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int Dimension ;
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bool IsSigned ;
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const unsigned int (*CodeBook)[HuffmanEntries] ;
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const int *NTuples ;
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} CodeBookDescription ;
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int DecodeHuffmanWord (CDolbyBitStream &bs, const unsigned int (*CodeBook) [HuffmanEntries]) ;
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int UnpackIndex (int idx, int *qp, const CodeBookDescription *hcb) ;
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int GetEscape (CDolbyBitStream &bs, const int q) ;
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static const CodeBookDescription HuffmanCodeBooks [13] ;
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//
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float InverseQuantize (int q) ;
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int m_SectBits ;
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// window functions
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static const float m_OnlyLongWindowSine [1024] ;
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static const float m_OnlyLongWindowKBD [1024] ;
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static const float m_OnlyShortWindowSine [128] ;
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static const float m_OnlyShortWindowKBD [128] ;
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const float *m_LongWindow [2] ;
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const float *m_ShortWindow [2] ;
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// imdct
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void Split (const float [], float [], float [], const float [], int) ;
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void Merge (float [], const float [], const float [], int ) ;
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void Dct1024 (float vec [], const float cosTerms []) ;
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void Dct128 (float vec [], const float cosTerms []) ;
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void Dct16 (float vec [], const float cosTerms []) ;
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// speed-up tabes
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static const float m_InverseQuantTable [CBlock::InverseQuantTableSize] ;
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static const float m_ExpTable [CBlock::ExpTableSize] ;
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// exceptions
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DECLARE_EXCEPTION(EInvalidCodeBook, AAC_INVALIDCODEBOOK, "Invalid Huffman Codebook") ;
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DECLARE_EXCEPTION(EUnimplemented, AAC_UNIMPLEMENTED, "Unimplemented Feature Used") ;
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// platform dependent stuff
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#if defined (WIN32) && defined (_M_IX86)
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void PentiumOverlap (float output [], float spec [], float prev [], unsigned int stride);
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#endif
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} ;
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/** Spectral Data For One Long Block.
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This class holds the spectral coefficients for the current frame in case it's
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a start block, a stop block or a regular long block.
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*/
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class CLongBlock : public CBlock
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{
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friend CBlock &operator+= (CBlock &, CBlock &) ;
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public :
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CLongBlock (CChannelInfo &) ;
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virtual ~CLongBlock () ;
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virtual void FrequencyToTime (COverlapAddBuffer &, float [], const int) ;
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//MSV
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virtual void FrequencyToTime_Fast (COverlapAddBuffer &) ;
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virtual void FrequencyToTime (COverlapAddBuffer &);
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// gimmicks
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virtual void ApplyEqualizationMask (float Mask []) ;
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//MSV:
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virtual SECTION_INFORMATION_STRUCT* GetSectionInfo(){return (&sSectionInfoStruct);}
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virtual float *AccessSpectralData (int window = 0) ;
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virtual float *AccessOutput() {return m_Output;}
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virtual short *AccessShortOutput() {return m_ShortOutput;}
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private:
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SECTION_INFORMATION_STRUCT sSectionInfoStruct;
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protected :
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// overridden readers
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virtual void ReadSectionData (CDolbyBitStream &bs) ;
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virtual void ReadScaleFactorData (CDolbyBitStream &bs, int const global_gain) ;
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virtual void ReadSpectralData (CDolbyBitStream &bs) ;
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// tools interface
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virtual int *AccessCodeBooks (int group) ;
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virtual int *AccessScaleFactors (int group) ;
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int GetMaximumBins() { return MaximumBins; } ;
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// private
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void InverseTransform (float data []) ;
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void ApplyWindowFunction (COverlapAddBuffer &Previous) ;
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enum
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{
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MaximumScaleFactorBands = 64,
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MaximumBins = 1024
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} ;
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int m_CodeBook [CLongBlock::MaximumScaleFactorBands] ;
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int m_ScaleFactor [CLongBlock::MaximumScaleFactorBands] ;
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float m_SpectralCoefficient [2 * CLongBlock::MaximumBins] ;
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float m_Output[1024];
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short m_ShortOutput[1024];
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// platform dependent stuff
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#if defined (WIN32) && defined (_M_IX86)
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void PentiumWindow (float spec [], const float prev [], const float curr []) ;
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#endif
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} ;
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/** Spectral Data For One Short Block.
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This class holds the spectral coefficients for the current frame in case it's
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a short block, i.e. consists of eight short windows.
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*/
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class CShortBlock : public CBlock
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{
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friend CBlock &operator+= (CBlock &, CBlock &) ;
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public :
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CShortBlock (CChannelInfo &) ;
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virtual ~CShortBlock () ;
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virtual void FrequencyToTime (COverlapAddBuffer &, float [], const int) ;
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//MSV
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virtual void FrequencyToTime_Fast (COverlapAddBuffer &) ;
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virtual void FrequencyToTime (COverlapAddBuffer &);
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// gimmicks
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virtual void ApplyEqualizationMask (float Mask []) ;
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virtual float *AccessSpectralData (int window = 0) ;
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virtual float *AccessOutput() {return m_Output;}
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virtual short *AccessShortOutput() {return m_ShortOutput;}
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virtual SECTION_INFORMATION_STRUCT* GetSectionInfo(){return (&sSectionInfoStruct);}
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private:
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SECTION_INFORMATION_STRUCT sSectionInfoStruct;
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protected :
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// overridden readers
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virtual void ReadSectionData (CDolbyBitStream &bs) ;
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virtual void ReadScaleFactorData (CDolbyBitStream &bs, const int global_gain) ;
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virtual void ReadSpectralData (CDolbyBitStream &bs) ;
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// tools interface
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virtual int *AccessCodeBooks (int group) ;
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virtual int *AccessScaleFactors (int group) ;
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// private
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void InverseTransform (float data []) ;
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void TransformWindows (COverlapAddBuffer &Previous, float EightWindowsBuffer []) ;
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//
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enum
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{
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MaximumWindows = 8,
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MaximumGroups = MaximumWindows,
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MaximumScaleFactorBands = 16,
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MaximumBins = 128
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} ;
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int m_CodeBook [CShortBlock::MaximumGroups][CShortBlock::MaximumScaleFactorBands] ;
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int m_ScaleFactor [CShortBlock::MaximumGroups][CShortBlock::MaximumScaleFactorBands] ;
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float m_SpectralCoefficient [CShortBlock::MaximumWindows][2 * CShortBlock::MaximumBins] ;
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float m_Output[1024];
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short m_ShortOutput[1024];
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} ;
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#endif
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