1 files changed, 295 insertions, 0 deletions
diff --git a/src/sdp/sdp.h b/src/sdp/sdp.h
new file mode 100644
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--- /dev/null
+++ b/src/sdp/sdp.h
@@ -0,0 +1,295 @@
+/*
+    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
+*/
+
+// Session description
+
+#ifndef _H_SDP
+#define _H_SDP
+
+#include <list>
+#include <map>
+#include <string>
+#include "audio/audio_codecs.h"
+#include "parser/sip_body.h"
+
+/** User name to be put in o= line of SDP */
+#define SDP_O_USER		"twinkle"
+
+// Audio codec formats
+#define SDP_FORMAT_G711_ULAW	0
+#define SDP_FORMAT_GSM		3
+#define SDP_FORMAT_G711_ALAW	8
+
+// rtpmap values
+#define SDP_RTPMAP_G711_ULAW	"PCMU/8000"
+#define SDP_RTPMAP_GSM		"GSM/8000"
+#define SDP_RTPMAP_G711_ALAW	"PCMA/8000"
+#define SDP_RTPMAP_SPEEX_NB	"speex/8000"
+#define SDP_RTPMAP_SPEEX_WB	"speex/16000"
+#define SDP_RTPMAP_SPEEX_UWB	"speex/32000"
+#define SDP_RTPMAP_ILBC		"iLBC/8000"
+#define SDP_RTPMAP_G726_16	"G726-16/8000"
+#define SDP_RTPMAP_G726_24	"G726-24/8000"
+#define SDP_RTPMAP_G726_32	"G726-32/8000"
+#define SDP_RTPMAP_G726_40	"G726-40/8000"
+#define SDP_RTPMAP_TELEPHONE_EV	"telephone-event/8000"
+
+// Audio codec names
+#define SDP_AC_NAME_G711_ULAW		"PCMU"
+#define SDP_AC_NAME_G711_ALAW		"PCMA"
+#define SDP_AC_NAME_GSM			"GSM"
+#define SDP_AC_NAME_SPEEX		"speex"
+#define SDP_AC_NAME_ILBC		"iLBC"
+#define SDP_AC_NAME_G726_16		"G726-16"
+#define SDP_AC_NAME_G726_24		"G726-24"
+#define SDP_AC_NAME_G726_32		"G726-32"
+#define SDP_AC_NAME_G726_40		"G726-40"
+#define SDP_AC_NAME_TELEPHONE_EV	"telephone-event"
+
+// Check on fmtp parameter values
+#define VALID_ILBC_MODE(mode) ((mode) == 20 || (mode == 30))
+
+using namespace std;
+
+enum t_sdp_ntwk_type {
+	SDP_NTWK_NULL,
+	SDP_NTWK_IN
+};
+
+string sdp_ntwk_type2str(t_sdp_ntwk_type n);
+t_sdp_ntwk_type str2sdp_ntwk_type(string s);
+
+
+enum t_sdp_addr_type {
+	SDP_ADDR_NULL,
+	SDP_ADDR_IP4,
+	SDP_ADDR_IP6
+};
+
+string sdp_addr_type2str(t_sdp_addr_type a);
+t_sdp_addr_type str2sdp_addr_type(string s);
+
+
+/** Transport protocol */
+enum t_sdp_transport {
+	SDP_TRANS_RTP,		/**< RTP/AVP */
+	SDP_TRANS_UDP,		/**< UDP */
+	SDP_TRANS_OTHER		/**< Another protocol not yet supported */
+};
+
+string sdp_transport2str(t_sdp_transport t);
+t_sdp_transport str2sdp_transport(string s);
+
+
+enum t_sdp_media_direction {
+	SDP_INACTIVE,
+	SDP_SENDONLY,
+	SDP_RECVONLY,
+	SDP_SENDRECV
+};
+
+string sdp_media_direction2str(t_sdp_media_direction d);
+
+
+enum t_sdp_media_type {
+	SDP_AUDIO,
+	SDP_VIDEO,
+	SDP_OTHER
+};
+
+t_sdp_media_type str2sdp_media_type(string s);
+string sdp_media_type2str(t_sdp_media_type m);
+
+
+class t_sdp_origin {
+public:
+	string			username;
+	string			session_id;
+	string			session_version;
+	t_sdp_ntwk_type		network_type;
+	t_sdp_addr_type		address_type;
+	string			address;
+
+	t_sdp_origin();
+	t_sdp_origin(string _username, string _session_id,
+		     string _session_version, string _address);
+
+	string encode(void) const;
+};
+
+class t_sdp_connection {
+public:
+	t_sdp_ntwk_type		network_type;
+	t_sdp_addr_type		address_type;
+	string			address;
+
+	t_sdp_connection();
+	t_sdp_connection(string _address);
+	string encode(void) const;
+};
+
+class t_sdp_attr {
+public:
+	string			name;
+	string			value;
+
+	t_sdp_attr(string _name);
+	t_sdp_attr(string _name, string _value);
+	string encode(void) const;
+};
+
+/** 
+ * Media definition.
+ * The data from an m= line and associated a= lines.
+ */
+class t_sdp_media {
+private:
+	/** Dynamic payload type for DTMF */
+	unsigned short		format_dtmf;
+
+public:
+	/** The media type, e.g. audio, video */
+	string			media_type;
+	
+	/** Port to receive media */
+	unsigned short		port;
+	
+	/** Transport protocol, e.g. RTP/AVP */
+	string			transport;
+	
+	/** 
+	 * @name Media formats 
+	 * Depending on the media type, formats are in numeric format or
+	 * alpha numeric format. Only one of the following formats will
+	 * be populated.
+	 */
+	//@{
+	/** Media formats in numeric form, i.e. audio codecs */
+	list<unsigned short>	formats;
+	
+	/** Media formats in alpha numeric form. */
+	list<string>		alpha_num_formats;
+	//@}
+	
+	/** Optional connection information if not specified on global level. */
+	t_sdp_connection	connection;
+	
+	/** Attributes (a= lines) */
+	list <t_sdp_attr>	attributes;
+
+	t_sdp_media();
+	t_sdp_media(t_sdp_media_type _media_type,
+		    unsigned short _port, const list<t_audio_codec> &_formats,
+	            unsigned short _format_dtmf, 
+	            const map<t_audio_codec, unsigned short> &ac2format);
+
+	string encode(void) const;
+	void add_format(unsigned short f, t_audio_codec codec);
+	t_sdp_attr *get_attribute(const string &name);
+	list<t_sdp_attr *>get_attributes(const string &name);
+	t_sdp_media_direction get_direction(void) const;
+	t_sdp_media_type get_media_type(void) const;
+	t_sdp_transport get_transport(void) const;
+};
+
+class t_sdp : public t_sip_body {
+public:
+	unsigned short		version;
+	t_sdp_origin		origin;
+	string			session_name;
+	t_sdp_connection	connection;
+	list<t_sdp_attr>	attributes;
+	list<t_sdp_media>	media;
+
+	t_sdp();
+
+	// Create SDP with a single audio media stream
+	t_sdp(const string &user, const string &sess_id, const string &sess_version, 
+	      const string &user_host, const string &media_host, unsigned short media_port,
+	      const list<t_audio_codec> &formats, unsigned short format_dtmf,
+	      const map<t_audio_codec, unsigned short> &ac2format);
+
+	// Create SDP without media streams
+	t_sdp(const string &user, const string &sess_id, const string &sess_version, 
+		const string &user_host, const string &media_host);
+
+	// Add media stream
+	void add_media(const t_sdp_media &m);
+
+	string encode(void) const;
+	t_sip_body *copy(void) const;
+	t_body_type get_type(void) const;
+	t_media get_media(void) const;
+
+	// Return true if the current SDP is supported:
+	// version is 0
+	// 1 audio stream RTP
+	// IN IP4 addressing
+	// connection at session level only
+	// If false is returned, then a warning code and text is returned.
+	bool is_supported(int &warn_code, string &warn_text) const;
+
+	// Get/set codec/rtp info for first media stream having a non-zero
+	// value for the port of the given media type
+	string get_rtp_host(t_sdp_media_type media_type) const;
+	unsigned short get_rtp_port(t_sdp_media_type media_type) const;
+	list<unsigned short> get_codecs(t_sdp_media_type media_type) const;
+
+	// Get codec description from rtpmap
+	string get_codec_description(t_sdp_media_type media_type,
+			unsigned short codec) const;
+	t_audio_codec get_rtpmap_codec(const string &rtpmap) const;
+	t_audio_codec get_codec(t_sdp_media_type media_type,
+			unsigned short codec) const;
+	t_sdp_media_direction get_direction(t_sdp_media_type media_type) const;
+	
+	// Get ftmp attribute
+	string get_fmtp(t_sdp_media_type media_type, unsigned short codec) const;
+	
+	// Get a specific parameter from fmtp, assuming the fmtp string is a list
+	// of paramter=value strings separated by semi-colons
+	// Returns -1 on failure
+	int get_fmtp_int_param(t_sdp_media_type media_type, unsigned short codec,
+			const string param) const;
+
+	// Get ptime. Returns 0 if ptime is not present
+	unsigned short get_ptime(t_sdp_media_type media_type) const;
+	
+	bool get_zrtp_support(t_sdp_media_type media_type) const;
+	
+	void set_ptime(t_sdp_media_type media_type, unsigned short ptime);
+	void set_direction(t_sdp_media_type media_type, t_sdp_media_direction direction);
+	void set_fmtp(t_sdp_media_type media_type, unsigned short codec, const string &fmtp);
+	void set_fmtp_int_param(t_sdp_media_type media_type, unsigned short codec,
+			const string &param, int value);
+	void set_zrtp_support(t_sdp_media_type media_type);
+
+	// Returns a pointer to the first media stream in the list of media
+	// streams having a non-zero port value for the give media type.
+	// Returns NULL if no such media stream can be found.
+	const t_sdp_media *get_first_media(t_sdp_media_type media_type) const;
+	
+	/**
+	 * Check if all local IP address are correctly filled in. This
+	 * check is an integrity check to help debugging the auto IP
+	 * discover feature.
+	 */
+	virtual bool local_ip_check(void) const;
+};
+
+#endif