/*
 * $Id: AmRtpAudio.h,v 1.1.2.4 2005/04/13 10:57:09 rco Exp $
 *
 * Copyright (C) 2002-2003 Fhg Fokus
 *
 * This file is part of sems, a free SIP media server.
 *
 * sems 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 2 of the License, or
 * (at your option) any later version
 *
 * For a license to use the ser software under conditions
 * other than those described here, or to purchase support for this
 * software, please contact iptel.org by e-mail at the following addresses:
 *    info@iptel.org
 *
 * sems 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef _AmRtpAudio_h_
#define _AmRtpAudio_h_

#include "AmAudio.h"
#include "AmRtpStream.h"
#include "AmPlayoutBuffer.h"
#include "LowcFE.h"

// Maximum value: AUDIO_BUFFER_SIZE / 2
// Note: plc result get stored in our back buffer
#define PLC_MAX_SAMPLES (160*4) 

/** 
 * \brief binds together a \ref AmRtpStream and an \ref AmAudio for a session 
 */

class AmRtpAudio: public AmRtpStream, public AmAudio
{
    auto_ptr<AmPlayoutBuffer> playout_buffer;

    LowcFE       fec;
    bool         use_default_plc;

    unsigned int last_check;
    bool         last_check_i;
    bool         send_int;

    unsigned int last_ts;
    bool         last_ts_i;

    bool         send_only;

    // Conceals packet loss into the back buffer
    // @return length in bytes of the recivered segment
    unsigned int conceal_loss(unsigned int ts_diff);

    //
    // Default packet loss concealment functions
    //
    unsigned int default_plc(unsigned char* out_buf,
			     unsigned int   size,
			     unsigned int   channels,
			     unsigned int   rate);

    void add_to_history(unsigned int size);

public:
    AmRtpAudio(AmSession* _s=0);

    bool checkInterval(unsigned int ts);
    bool sendIntReached();

    int receive(unsigned int audio_buffer_ts);

    void setSendOnly(bool so){
	send_only = so;
    }

    // AmAudio interface
    int read(unsigned int user_ts, unsigned int size);
    int write(unsigned int user_ts, unsigned int size);

    int get(unsigned int user_ts, unsigned char* buffer, 
	    unsigned int nb_samples);

    // AmRtpStream interface
    void init(const SdpPayload* sdp_payload);

    void setAdaptivePlayout(bool on);
};

#endif

// Local Variables:
// mode:C++
// End: