* Copyright (C) 2010 Stefan Sayer
 * Copyright (C) 2011 Raphael Coeffic
 * 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. This program is released under
 * the GPL with the additional exemption that compiling, linking,
 * and/or using OpenSSL is allowed.
 * For a license to use the SEMS 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
 * 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 _AmDtmfSender_h_
#define _AmDtmfSender_h_

#include "AmThread.h"

#include <queue>
using std::queue;
using std::pair;

class AmRtpStream;

class AmDtmfSender
  // event, duration
  typedef pair<int, unsigned int> Dtmf;

  enum sending_state_t {
    DTMF_SEND_NONE,      // not sending event
    DTMF_SEND_SENDING,   // sending event
    DTMF_SEND_ENDING     // sending end of event
  } sending_state;

  queue<Dtmf> send_queue;
  AmMutex     send_queue_mut;

  Dtmf         current_send_dtmf;
  unsigned int current_send_dtmf_ts;
  int          send_dtmf_end_repeat;


  /** Add a DTMF event to the send queue */
  void queueEvent(int event, unsigned int duration_ms, unsigned int sample_rate);

  /** Processes the send queue according to the timestamp */
  void sendPacket(unsigned int ts, unsigned int remote_pt, AmRtpStream* stream);