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1 /*
2  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #ifndef WEBRTC_P2P_BASE_SESSIONDESCRIPTION_H_
12 #define WEBRTC_P2P_BASE_SESSIONDESCRIPTION_H_
13 
14 #include <string>
15 #include <vector>
16 
17 #include "webrtc/p2p/base/transportinfo.h"
18 #include "webrtc/base/constructormagic.h"
19 
20 namespace cricket {
21 
22 // Describes a session content. Individual content types inherit from
23 // this class.  Analagous to a <jingle><content><description> or
24 // <session><description>.
25 class ContentDescription {
26  public:
~ContentDescription()27   virtual ~ContentDescription() {}
28   virtual ContentDescription* Copy() const = 0;
29 };
30 
31 // Analagous to a <jingle><content> or <session><description>.
32 // name = name of <content name="...">
33 // type = xmlns of <content>
34 struct ContentInfo {
ContentInfoContentInfo35   ContentInfo() : description(NULL) {}
ContentInfoContentInfo36   ContentInfo(const std::string& name,
37               const std::string& type,
38               ContentDescription* description) :
39       name(name), type(type), rejected(false), description(description) {}
ContentInfoContentInfo40   ContentInfo(const std::string& name,
41               const std::string& type,
42               bool rejected,
43               ContentDescription* description) :
44       name(name), type(type), rejected(rejected), description(description) {}
45   std::string name;
46   std::string type;
47   bool rejected;
48   ContentDescription* description;
49 };
50 
51 typedef std::vector<std::string> ContentNames;
52 
53 // This class provides a mechanism to aggregate different media contents into a
54 // group. This group can also be shared with the peers in a pre-defined format.
55 // GroupInfo should be populated only with the |content_name| of the
56 // MediaDescription.
57 class ContentGroup {
58  public:
ContentGroup(const std::string & semantics)59   explicit ContentGroup(const std::string& semantics) :
60       semantics_(semantics) {}
61 
semantics()62   const std::string& semantics() const { return semantics_; }
content_names()63   const ContentNames& content_names() const { return content_names_; }
64 
65   const std::string* FirstContentName() const;
66   bool HasContentName(const std::string& content_name) const;
67   void AddContentName(const std::string& content_name);
68   bool RemoveContentName(const std::string& content_name);
69 
70  private:
71   std::string semantics_;
72   ContentNames content_names_;
73 };
74 
75 typedef std::vector<ContentInfo> ContentInfos;
76 typedef std::vector<ContentGroup> ContentGroups;
77 
78 const ContentInfo* FindContentInfoByName(
79     const ContentInfos& contents, const std::string& name);
80 const ContentInfo* FindContentInfoByType(
81     const ContentInfos& contents, const std::string& type);
82 
83 // Describes a collection of contents, each with its own name and
84 // type.  Analogous to a <jingle> or <session> stanza.  Assumes that
85 // contents are unique be name, but doesn't enforce that.
86 class SessionDescription {
87  public:
SessionDescription()88   SessionDescription() {}
SessionDescription(const ContentInfos & contents)89   explicit SessionDescription(const ContentInfos& contents) :
90       contents_(contents) {}
SessionDescription(const ContentInfos & contents,const ContentGroups & groups)91   SessionDescription(const ContentInfos& contents,
92                      const ContentGroups& groups) :
93       contents_(contents),
94       content_groups_(groups) {}
SessionDescription(const ContentInfos & contents,const TransportInfos & transports,const ContentGroups & groups)95   SessionDescription(const ContentInfos& contents,
96                      const TransportInfos& transports,
97                      const ContentGroups& groups) :
98       contents_(contents),
99       transport_infos_(transports),
100       content_groups_(groups) {}
~SessionDescription()101   ~SessionDescription() {
102     for (ContentInfos::iterator content = contents_.begin();
103          content != contents_.end(); ++content) {
104       delete content->description;
105     }
106   }
107 
108   SessionDescription* Copy() const;
109 
110   // Content accessors.
contents()111   const ContentInfos& contents() const { return contents_; }
contents()112   ContentInfos& contents() { return contents_; }
113   const ContentInfo* GetContentByName(const std::string& name) const;
114   ContentInfo* GetContentByName(const std::string& name);
115   const ContentDescription* GetContentDescriptionByName(
116       const std::string& name) const;
117   ContentDescription* GetContentDescriptionByName(const std::string& name);
118   const ContentInfo* FirstContentByType(const std::string& type) const;
119   const ContentInfo* FirstContent() const;
120 
121   // Content mutators.
122   // Adds a content to this description. Takes ownership of ContentDescription*.
123   void AddContent(const std::string& name,
124                   const std::string& type,
125                   ContentDescription* description);
126   void AddContent(const std::string& name,
127                   const std::string& type,
128                   bool rejected,
129                   ContentDescription* description);
130   bool RemoveContentByName(const std::string& name);
131 
132   // Transport accessors.
transport_infos()133   const TransportInfos& transport_infos() const { return transport_infos_; }
transport_infos()134   TransportInfos& transport_infos() { return transport_infos_; }
135   const TransportInfo* GetTransportInfoByName(
136       const std::string& name) const;
137   TransportInfo* GetTransportInfoByName(const std::string& name);
GetTransportDescriptionByName(const std::string & name)138   const TransportDescription* GetTransportDescriptionByName(
139       const std::string& name) const {
140     const TransportInfo* tinfo = GetTransportInfoByName(name);
141     return tinfo ? &tinfo->description : NULL;
142   }
143 
144   // Transport mutators.
set_transport_infos(const TransportInfos & transport_infos)145   void set_transport_infos(const TransportInfos& transport_infos) {
146     transport_infos_ = transport_infos;
147   }
148   // Adds a TransportInfo to this description.
149   // Returns false if a TransportInfo with the same name already exists.
150   bool AddTransportInfo(const TransportInfo& transport_info);
151   bool RemoveTransportInfoByName(const std::string& name);
152 
153   // Group accessors.
groups()154   const ContentGroups& groups() const { return content_groups_; }
155   const ContentGroup* GetGroupByName(const std::string& name) const;
156   bool HasGroup(const std::string& name) const;
157 
158   // Group mutators.
AddGroup(const ContentGroup & group)159   void AddGroup(const ContentGroup& group) { content_groups_.push_back(group); }
160   // Remove the first group with the same semantics specified by |name|.
161   void RemoveGroupByName(const std::string& name);
162 
163   // Global attributes.
set_msid_supported(bool supported)164   void set_msid_supported(bool supported) { msid_supported_ = supported; }
msid_supported()165   bool msid_supported() const { return msid_supported_; }
166 
167  private:
168   ContentInfos contents_;
169   TransportInfos transport_infos_;
170   ContentGroups content_groups_;
171   bool msid_supported_ = true;
172 };
173 
174 // Indicates whether a ContentDescription was an offer or an answer, as
175 // described in http://www.ietf.org/rfc/rfc3264.txt. CA_UPDATE
176 // indicates a jingle update message which contains a subset of a full
177 // session description
178 enum ContentAction {
179   CA_OFFER, CA_PRANSWER, CA_ANSWER, CA_UPDATE
180 };
181 
182 // Indicates whether a ContentDescription was sent by the local client
183 // or received from the remote client.
184 enum ContentSource {
185   CS_LOCAL, CS_REMOTE
186 };
187 
188 }  // namespace cricket
189 
190 #endif  // WEBRTC_P2P_BASE_SESSIONDESCRIPTION_H_
191