1 files changed, 98 insertions, 0 deletions
diff --git a/src/audio/dtmf_player.h b/src/audio/dtmf_player.h
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+++ b/src/audio/dtmf_player.h
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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
+*/
+
+// Classes to generate RTP payloads for DTMF tones.
+
+#ifndef _DTMF_PLAYER_H
+#define _DTMF_PLAYER_H
+
+#include <cc++/config.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
+	uint8		_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, uint8 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, uint8 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, uint8 dtmf_tone, uint32 dtmf_timestamp,
+		uint16 nsamples);
+	
+	virtual uint16 get_payload(uint8 *payload, uint16 payload_size,
+		uint32 timestamp, uint32 &rtp_timestamp);
+};
+
+#endif