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gsmcodec.cpp

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    gsmcodec.cpp 2.09 KiB
    /**
     *  Copyright (C) 2004-2005 Savoir-Faire Linux inc.
     *  Author: Yan Morin <yan.morin@savoirfairelinux.com>
     *  Author: Laurielle Lea <laurielle.lea@savoirfairelinux.com>
     *
     *  This program is free software; you can redistribute it and/or modify
     *  it under the terms of the GNU General Public License as published by
     *  the Free Software Foundation; either version 3 of the License, or
     *  (at your option) any later version.
     *
     *  This program is distributed in the hope that it will be useful,
     *  but WITHOUT ANY WARRANTY; without even the implied warranty of
     *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     *  GNU General Public License for more details.
     *
     *  You should have received a copy of the GNU General Public License
     *  along with this program; if not, write to the Free Software
     *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
     */
    
    #include <iostream>
    #include <gsm/gsm.h>
    #include "audiocodec.h"
    #include "../global.h"
    
    
    class Gsm : public AudioCodec {
    public:
    // 3 GSM A 8000 1 [RFC3551]
    Gsm(int payload = 0) 
    : AudioCodec(payload, "GSM")
    {
      _description = "GSM";
      _clockRate = 8000;
      _channel   = 1;
      
      if (!(_decode_gsmhandle = gsm_create() )) 
        _debug("ERROR: decode_gsm_create\n");
      if (!(_encode_gsmhandle = gsm_create() )) 
        _debug("AudioCodec: ERROR: encode_gsm_create\n");
      
    }
    
    ~Gsm (void)
    {
      gsm_destroy(_decode_gsmhandle);
      gsm_destroy(_encode_gsmhandle);
    }
    
    virtual int codecDecode (short *dst, unsigned char *src, unsigned int size) 
    {
      (void)size;
      if (gsm_decode(_decode_gsmhandle, (gsm_byte*)src, (gsm_signal*)dst) < 0) {
        _debug("ERROR: gsm_decode\n");
      }
      return 320;
    }
    
    virtual int codecEncode (unsigned char *dst, short *src, unsigned int size) 
    {
      (void)size;
      gsm_encode(_encode_gsmhandle, (gsm_signal*)src, (gsm_byte*)dst);  
      return 33;
    }
    
    virtual void test()
    {
     printf("MOn OSTIE GSM!!!!!!!!!!!!!!!!!!!!!!!!!!\n");
    }
    
    private:
    	gsm _decode_gsmhandle;
     	gsm _encode_gsmhandle;
    
    };
    
    // the class factories
    extern "C" AudioCodec* create_gsm() {
        return new Gsm();
    }
    
    extern "C" void destroy_gsm(AudioCodec* a) {
        delete a;
    }