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/*
Copyright (C) 2005-2009 Michel de Boer <michel@twinklephone.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 2 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
// RFC 2833
// RTP payload format for DTMF telephone events
#ifndef _RTP_TELEPHONE_EVENT_H
#define _RTP_TELEPHONE_EVENT_H
// RFC 2833 3.10
// DTMF events
typedef unsigned char t_dtmf_ev;
#define TEL_EV_DTMF_0 0
#define TEL_EV_DTMF_1 1
#define TEL_EV_DTMF_2 2
#define TEL_EV_DTMF_3 3
#define TEL_EV_DTMF_4 4
#define TEL_EV_DTMF_5 5
#define TEL_EV_DTMF_6 6
#define TEL_EV_DTMF_7 7
#define TEL_EV_DTMF_8 8
#define TEL_EV_DTMF_9 9
#define TEL_EV_DTMF_STAR 10
#define TEL_EV_DTMF_POUND 11
#define TEL_EV_DTMF_A 12
#define TEL_EV_DTMF_B 13
#define TEL_EV_DTMF_C 14
#define TEL_EV_DTMF_D 15
#define TEL_EV_DTMF_INVALID ((t_dtmf_ev) 0xff)
static inline bool is_valid_dtmf_ev(t_dtmf_ev ev)
{
return (ev <= TEL_EV_DTMF_D);
}
static inline bool is_valid_dtmf_sym(char s)
{
if (s >= '0' && s <= '9')
return true;
if (s >= 'a' && s <= 'd')
return true;
if (s >= 'A' && s <= 'D')
return true;
if (s == '*' || s == '#')
return true;
return false;
}
// RFC 2833 3.5
// Payload format (in network order!!)
struct t_rtp_telephone_event {
private:
unsigned char event : 8;
unsigned char volume : 6;
bool reserved : 1;
bool end : 1;
unsigned short duration : 16;
public:
// Values set/get are in host order
void set_event(unsigned char _event);
void set_volume(unsigned char _volume);
void set_reserved(bool _reserved);
void set_end(bool _end);
void set_duration(unsigned short _duration);
unsigned char get_event(void) const;
unsigned char get_volume(void) const;
bool get_reserved(void) const;
bool get_end(void) const;
unsigned short get_duration(void) const;
};
unsigned char char2dtmf_ev(char sym);
char dtmf_ev2char(unsigned char ev);
#endif
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