197 lines
4.3 KiB
C++
197 lines
4.3 KiB
C++
/* $Header: /cvs/root/winamp/vlb/channelinfo.h,v 1.1 2009/04/28 20:21:08 audiodsp Exp $ */
|
|
|
|
/***************************************************************************\
|
|
*
|
|
* Copyright 2000-2002 Dolby Laboratories, Inc. All Rights
|
|
* Reserved. Do not copy. Do not distribute.
|
|
* Confidential information.
|
|
*
|
|
* (C) copyright Fraunhofer - IIS (1998)
|
|
* All Rights Reserved
|
|
*
|
|
* filename: channelinfo.h
|
|
* project : MPEG-2 AAC Decoder
|
|
* contents/description: independent channel stream info object
|
|
*
|
|
* $Header: /cvs/root/winamp/vlb/channelinfo.h,v 1.1 2009/04/28 20:21:08 audiodsp Exp $
|
|
*
|
|
\***************************************************************************/
|
|
|
|
#ifndef __CHANNELINFO_H__
|
|
#define __CHANNELINFO_H__
|
|
|
|
#include "bitsequence.h"
|
|
#include "exception.h"
|
|
#include "streaminfo.h"
|
|
|
|
class CDolbyBitStream ;
|
|
class CProgramConfig ;
|
|
class CStreamInfo ;
|
|
|
|
/** Channel Element Side Information.
|
|
|
|
This class provides information essential to various parts of the decoder.
|
|
It reads the ics_info() bitstream elements and provides accordingly mapped
|
|
access to some static tables, first of all scale factor band widths.
|
|
*/
|
|
|
|
class CChannelInfo
|
|
{
|
|
|
|
public :
|
|
|
|
// // //
|
|
|
|
enum
|
|
{
|
|
OnlyLongSequence = 0,
|
|
LongStartSequence,
|
|
EightShortSequence,
|
|
LongStopSequence,
|
|
|
|
#ifdef MAIN_PROFILE
|
|
PredictionBandsTotal = 42,
|
|
#endif
|
|
|
|
ProfileMain = 0,
|
|
ProfileLowComplexity,
|
|
ProfileSSR,
|
|
ProfileReserved
|
|
|
|
} ;
|
|
|
|
// // //
|
|
|
|
CChannelInfo () ;
|
|
~CChannelInfo () ;
|
|
|
|
void Read (CDolbyBitStream &bs) ;
|
|
|
|
bool IsValid (void) const ;
|
|
bool IsLongBlock (void) const ;
|
|
bool IsShortBlock (void) const ;
|
|
bool IsMainProfile (void) const ;
|
|
|
|
void Reset (const CStreamInfo &) ;
|
|
|
|
int GetProfile (void) const ;
|
|
|
|
int GetWindowShape (void) const
|
|
{
|
|
return m_WindowShape ;
|
|
}
|
|
|
|
int GetWindowSequence (void) const ;
|
|
int GetWindowsPerFrame (void) const ;
|
|
|
|
int GetWindowGroups (void) const ;
|
|
int GetWindowGroupLength (int index) const ;
|
|
|
|
int GetScaleFactorBandsTransmitted (void) const
|
|
{
|
|
return m_MaxSfBands ;
|
|
}
|
|
|
|
int GetScaleFactorBandsTotal (void) const
|
|
{
|
|
return m_TotalSfBands ;
|
|
}
|
|
|
|
const int *GetScaleFactorBandOffsets (void) const ;
|
|
|
|
int GetSamplingFrequency (void) const ;
|
|
int GetMaximumTnsBands (void) const ;
|
|
|
|
#ifdef MAIN_PROFILE
|
|
// // // Prediction
|
|
|
|
int GetMaximumPredictionBands (void) const ;
|
|
|
|
bool GetPredictorDataPresent (void) const
|
|
{
|
|
return m_PredictorDataPresent ? true : false ;
|
|
}
|
|
|
|
bool GetPredictionUsedForBand (int band) const
|
|
{
|
|
return m_PredictionUsed [band] ;
|
|
}
|
|
|
|
bool GetPerformPredictorReset (void) const
|
|
{
|
|
if (GetPredictorDataPresent ())
|
|
{
|
|
return m_PredictorReset ? true : false ;
|
|
}
|
|
|
|
return false ;
|
|
}
|
|
|
|
int GetPredictorResetGroupNumber (void) const
|
|
{
|
|
return m_PredictorResetGroupNumber ;
|
|
}
|
|
|
|
void DeactivatePrediction (int band) ;
|
|
|
|
// // //
|
|
#endif
|
|
|
|
static int SamplingRateFromIndex (int index) ;
|
|
|
|
int GetSamplingIndex(){return m_SamplingRateIndex;}
|
|
int GetLastBin() ;
|
|
|
|
protected :
|
|
bool m_Valid ;
|
|
|
|
CVLBBitSequence m_IcsReservedBit ;
|
|
CVLBBitSequence m_WindowSequence ;
|
|
CVLBBitSequence m_WindowShape ;
|
|
CVLBBitSequence m_MaxSfBands ;
|
|
CVLBBitSequence m_ScaleFactorGrouping ;
|
|
|
|
// prediction
|
|
|
|
CVLBBitSequence m_PredictorDataPresent ;
|
|
#ifdef MAIN_PROFILE
|
|
CVLBBitSequence m_PredictorReset ;
|
|
CVLBBitSequence m_PredictorResetGroupNumber ;
|
|
|
|
bool m_PredictionUsed [CChannelInfo::PredictionBandsTotal] ;
|
|
|
|
// // //
|
|
#endif
|
|
|
|
int m_TotalSfBands ;
|
|
int m_SamplingRateIndex, m_Profile ;
|
|
|
|
int m_WindowGroups, m_WindowGroupLength [8] ;
|
|
|
|
// // //
|
|
|
|
#ifdef MAIN_PROFILE
|
|
DECLARE_EXCEPTION(EInvalidPredictorReset, AAC_INVALIDPREDICTORRESET, "Invalid Predictor Reset Group Indicated") ;
|
|
#endif
|
|
|
|
DECLARE_EXCEPTION(EUnsupportedWindowShape, AAC_UNSUPPORTEDWINDOWSHAPE, "Unsupported Window Shape Used") ;
|
|
DECLARE_EXCEPTION(EIllegalProfile, AAC_ILLEGAL_PROFILE, "Illegal Profile") ;
|
|
|
|
// // //
|
|
|
|
typedef struct
|
|
{
|
|
int SamplingFrequency ;
|
|
int NumberOfScaleFactorBands_Long ;
|
|
const int *ScaleFactorBands_Long ;
|
|
int NumberOfScaleFactorBands_Short ;
|
|
const int *ScaleFactorBands_Short ;
|
|
int MaximumPredictionBands ;
|
|
} SamplingRateInfo ;
|
|
|
|
static const SamplingRateInfo m_SamplingRateInfoTable [16] ;
|
|
|
|
} ;
|
|
|
|
#endif
|