138 lines
3.2 KiB
C++
138 lines
3.2 KiB
C++
/***************************************************************************\
|
|
*
|
|
* 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
|