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