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/*************************************************************************** *
* MPEG Layer3-Audio Decoder
* © 1997-2006 by Fraunhofer IIS
* All Rights Reserved
*
* filename: conceal.h
* project : ISO/MPEG-Decoder
* author : Stefan Gewinner
* date : 1998-05-26
* contents/description: error concealment class - HEADER
*
*
\***************************************************************************/
/*
* $Date: 2010/11/17 20:46:02 $
* $Id: conceal.h,v 1.1 2010/11/17 20:46:02 audiodsp Exp $
*/
#ifndef __CONCEAL_H__
#define __CONCEAL_H__
/* ------------------------ includes --------------------------------------*/
#include "mpeg.h"
/*-------------------------------------------------------------------------*/
//
// Error concealment class.
//
// This object is used to apply error concealment to a spectrum in case of
// CRC errors. CRC protection is optional for ISO/MPEG bitstreams.
//
class CErrorConcealment
{
public:
CErrorConcealment();
~CErrorConcealment() {}
void Init();
void Apply
(
bool fApply, // true: restore, false: store
const MPEG_INFO &Info,
MP3SI &Si,
float *lpSpec,
int gr,
int ch
);
enum { MAX_SPECTRUM_DATA = 4 };
protected :
//
// structure to hold information for one granule
//
typedef struct tagGRAN_DATA
{
MP3SI_GRCH gr; /* side info */
float Rs[SBLIMIT*SSLIMIT]; /* line amplitudes */
float nrg[23]; /* sf-band energies */
int nrgValid; /* valid-flag for sf-band energies */
#ifdef DEBUG_CONCEALMENT
long frameNumber;
#endif
} GRAN_DATA;
//
// structure for concealment data
//
typedef struct tagSPECTRUM_DATA
{
int writeOffset; /* place to store next valid granule */
GRAN_DATA gran[MAX_SPECTRUM_DATA]; /* ring buffer */
GRAN_DATA estGran;
} SPECTRUM_DATA;
SPECTRUM_DATA SpecDataBuffer[2]; /* one buffer for each channel */
void Store
(
const MPEG_INFO &Info,
const MP3SI &Si,
const float *lpSpec,
int gr,
int ch
);
void Restore
(
const MPEG_INFO &Info,
MP3SI &Si,
float *lpSpec,
int gr,
int ch
);
#ifdef USE_ENERGY_PREDICTION
float predict(const float *hist, const float *coff, int n);
void adaptPredictor(const float *hist, float pwr, float *coff, float d, int n);
#endif
void estimateBandEnergies(const MPEG_INFO &Info, GRAN_DATA *g);
void predictEnergies(const MPEG_INFO &Info, SPECTRUM_DATA *s);
//
// random seeds for the float and bit random generators
//
float ranHigh1(float a);
float ranHigh2(float a);
float ranLow(float a);
float ran3(long *idum);
int irbit2(unsigned long *iseed);
int inext;
int inextp;
long ma [56];
int iff ;
long f_seed, w_seed ;
unsigned long b_seed ;
#ifdef DEBUG_CONCEALMENT
long currentFrame ;
#endif
};
/*-------------------------------------------------------------------------*/
#endif
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