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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, see <https://www.gnu.org/licenses/>.
*/
// Classes to generate RTP payloads for DTMF tones.
#ifndef _DTMF_PLAYER_H
#define _DTMF_PLAYER_H
#include "twinkle_config.h"
#include "audio_encoder.h"
#include "freq_gen.h"
#include "user.h"
// Forward declarations
class t_audio_rx;
// Abstract class defintion for DTMF player
class t_dtmf_player {
protected:
// Audio receiver owning the DTMF player.
t_audio_rx *_audio_rx;
t_user *_user_config;
t_audio_encoder *_audio_encoder;
// Settings for current DTMF tone
bool _dtmf_pause; // indicates if playing is in the pause phase
bool _dtmf_stop; // indicates if DTMF should be stopped
t_dtmf_ev _dtmf_current; // Currently played DTMF tone
uint32 _dtmf_timestamp; // RTP timestamp (start of tone)
uint16 _dtmf_duration; // Duration of the tone currently played
uint16 _nsamples; // number of samples taken per packet
public:
t_dtmf_player(t_audio_rx *audio_rx, t_audio_encoder *audio_encoder,
t_user *user_config, t_dtmf_ev dtmf_tone, uint32 dtmf_timestamp,
uint16 nsamples);
virtual ~t_dtmf_player() {};
// Get payload for the DTMF tone
// rtp_timestamp will be set with the timestamp value to be put in the
// RTP header
// Returns the payload size
virtual uint16 get_payload(uint8 *payload, uint16 payload_size,
uint32 timestamp, uint32 &rtp_timestamp) = 0;
uint32 get_timestamp(void);
// Returns true when last payload has been delivered.
bool finished(void);
};
// DTMF player for RFC 2833 RTP telephone events
class t_rtp_event_dtmf_player : public t_dtmf_player {
public:
t_rtp_event_dtmf_player(t_audio_rx *audio_rx, t_audio_encoder *audio_encoder,
t_user *user_config, t_dtmf_ev dtmf_tone, uint32 dtmf_timestamp,
uint16 nsamples);
virtual uint16 get_payload(uint8 *payload, uint16 payload_size,
uint32 timestamp, uint32 &rtp_timestamp);
};
// DTMF player for inband tones
class t_inband_dtmf_player : public t_dtmf_player {
private:
// Frequency generator to generate the inband tones.
t_freq_gen _freq_gen;
public:
t_inband_dtmf_player(t_audio_rx *audio_rx, t_audio_encoder *audio_encoder,
t_user *user_config, t_dtmf_ev dtmf_tone, uint32 dtmf_timestamp,
uint16 nsamples);
virtual uint16 get_payload(uint8 *payload, uint16 payload_size,
uint32 timestamp, uint32 &rtp_timestamp);
};
#endif
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