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28 // This file contains interfaces for DataChannels
29 // http://dev.w3.org/2011/webrtc/editor/webrtc.html#rtcdatachannel
31 #ifndef TALK_APP_WEBRTC_DATACHANNELINTERFACE_H_
32 #define TALK_APP_WEBRTC_DATACHANNELINTERFACE_H_
36 #include "talk/base/basictypes.h"
37 #include "talk/base/buffer.h"
38 #include "talk/base/refcount.h"
43 struct DataChannelInit {
47 maxRetransmitTime(-1),
53 bool reliable; // Deprecated.
54 bool ordered; // True if ordered delivery is required.
55 int maxRetransmitTime; // The max period of time in milliseconds in which
56 // retransmissions will be sent. After this time, no
57 // more retransmissions will be sent. -1 if unset.
58 int maxRetransmits; // The max number of retransmissions. -1 if unset.
59 std::string protocol; // This is set by the application and opaque to the
60 // WebRTC implementation.
61 bool negotiated; // True if the channel has been externally negotiated
62 // and we do not send an in-band signalling in the
63 // form of an "open" message.
64 int id; // The stream id, or SID, for SCTP data channels. -1
69 DataBuffer(const talk_base::Buffer& data, bool binary)
73 // For convenience for unit tests.
74 explicit DataBuffer(const std::string& text)
75 : data(text.data(), text.length()),
78 size_t size() const { return data.length(); }
80 talk_base::Buffer data;
81 // Indicates if the received data contains UTF-8 or binary data.
82 // Note that the upper layers are left to verify the UTF-8 encoding.
83 // TODO(jiayl): prefer to use an enum instead of a bool.
87 class DataChannelObserver {
89 // The data channel state have changed.
90 virtual void OnStateChange() = 0;
91 // A data buffer was successfully received.
92 virtual void OnMessage(const DataBuffer& buffer) = 0;
95 virtual ~DataChannelObserver() {}
98 class DataChannelInterface : public talk_base::RefCountInterface {
100 // Keep in sync with DataChannel.java:State and
101 // RTCDataChannel.h:RTCDataChannelState.
104 kOpen, // The DataChannel is ready to send data.
109 virtual void RegisterObserver(DataChannelObserver* observer) = 0;
110 virtual void UnregisterObserver() = 0;
111 // The label attribute represents a label that can be used to distinguish this
112 // DataChannel object from other DataChannel objects.
113 virtual std::string label() const = 0;
114 virtual bool reliable() const = 0;
116 // TODO(tommyw): Remove these dummy implementations when all classes have
117 // implemented these APIs. They should all just return the values the
118 // DataChannel was created with.
119 virtual bool ordered() const { return false; }
120 virtual uint16 maxRetransmitTime() const { return 0; }
121 virtual uint16 maxRetransmits() const { return 0; }
122 virtual std::string protocol() const { return std::string(); }
123 virtual bool negotiated() const { return false; }
125 virtual int id() const = 0;
126 virtual DataState state() const = 0;
127 // The buffered_amount returns the number of bytes of application data
128 // (UTF-8 text and binary data) that have been queued using SendBuffer but
129 // have not yet been transmitted to the network.
130 virtual uint64 buffered_amount() const = 0;
131 virtual void Close() = 0;
132 // Sends |data| to the remote peer.
133 virtual bool Send(const DataBuffer& buffer) = 0;
136 virtual ~DataChannelInterface() {}
139 } // namespace webrtc
141 #endif // TALK_APP_WEBRTC_DATACHANNELINTERFACE_H_