Initial community commit

Src/replicant/nsmp3dec/conceal.h

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+/***************************************************************************\
+ *
+*                    MPEG Layer3-Audio Decoder
+*                  <20> 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