g711a1_plc.h

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/*
 * g711a1_plc.h
 *
 * packet loss concealment algorithm is based on the ITU recommendation
 * G.711 Appendix I.
 *
 * Copyright (c) 2008 Christian Hoene, University of Tuebingen, Germany
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 * the License for the specific language governing rights and limitations
 * under the License.
 *
 * The Initial Developer of the Original Code is Christian Hoene
 * based on the code given in ITU-T Recommendation G.711 Appendix I (09/99) 
 * "A high quality low-complexity algorithm for packet loss concealment with G.711"
 * Approved in 1999-09, www.itu.int.
 *
 * Contributor(s): ______________________________________.
 *
 * $Revision: 24499 $
 * $Author: rjongbloed $
 * $Date: 2010-06-15 04:29:05 -0500 (Tue, 15 Jun 2010) $
 */

#ifndef OPAL_CODEC_G711A1_PLC_H
#define OPAL_CODEC_G711A1_PLC_H

#ifndef SBC_DISABLE_PTLIB
#include <opal/buildopts.h>
#endif

#if OPAL_G711PLC

#include <string.h>

class OpalG711_PLC
{
  private:
    enum modes {
      LOSS_PERIOD1=10,            
      LOSS_PERIOD2start=20,       
      LOSS_PERIOD2overlap=21,     
      LOSS_PERIOD2=22,            
      LOSS_PERIOD3=30,            
      TRANSITION=40,              
      NOLOSS=0                    
    };

    int      conceal_count;       
    short  * transition_buf;      
    int      hist_len;            
    int      pitch_overlapmax;    
    short  * hist_buf;            
    short  * tmp_buf;             
    short *  conceal_overlapbuf;  
    double * pitch_buf;           
    double * pitch_lastq;         
    int      pitch_min;           
    int      pitch_max;           
    struct channel_counters {
      enum modes mode;            
      int      conceal_count;     
      int      transition_len;    
      int      transition_count;  
      int      pitch_overlap;     
      int      pitch_offset;      
      int      pitch;             
      int      pitch_blen;        
    } *channel;

    int      rate;                
    int      channels;            
    int ms2samples(int ms) const  
    {
      return ms*rate/1000;
    }


   public:
    OpalG711_PLC(int rate=8000, int channels=1, double pitch_low=66.6, double pitch_high=200);    
    ~OpalG711_PLC();

    void dofe(short *s, int size);         
    void addtohistory(short *s, int size);       
    int getAlgDelay() const { return pitch_overlapmax; };  
    void drop(short *s, int size);               
   private:
    void scalespeech(short *inout, int c, int sz, bool decay=true) const;
    void getfespeech(short *out, int c, int sz);
    void hist_savespeech(short *s, int size);
    int findpitch(int c);
    void overlapadd(double *l, double *r, double *o, int c, int cnt) const;
    void overlapadds(short *l, short *r, short *o, int c, int cnt) const;
    void overlapaddatend(short *s, short *f, int c, int start, int end, int count) const;
    void convertsf(short *f, double *t, int c, int cnt) const;
    void convertfs(double *f, short *t, int c, int cnt) const;

    inline void copy(double *f, double *t, int cnt) const { memmove(t,f,cnt*channels*sizeof(double)); };
    inline void copy(short *f, short *t, int cnt) const { memmove(t,f,cnt*channels*sizeof(short)); };

    int dofe_partly(short *out, int c, int size);
};


#endif // OPAL_G711PLC

#endif // OPAL_CODEC_G711A1_PLC_H

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