28e2075280
trunk/talk git-svn-id: http://webrtc.googlecode.com/svn/trunk@4318 4adac7df-926f-26a2-2b94-8c16560cd09d
155 lines
5.6 KiB
C++
155 lines
5.6 KiB
C++
/*
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* libjingle
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* Copyright 2012, Google Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TALK_APP_WEBRTC_DATACHANNEL_H_
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#define TALK_APP_WEBRTC_DATACHANNEL_H_
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#include <string>
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#include <queue>
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#include "talk/app/webrtc/datachannelinterface.h"
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#include "talk/app/webrtc/proxy.h"
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#include "talk/base/scoped_ref_ptr.h"
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#include "talk/base/sigslot.h"
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#include "talk/session/media/channel.h"
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namespace webrtc {
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class WebRtcSession;
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// DataChannel is a an implementation of the DataChannelInterface based on
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// libjingle's data engine. It provides an implementation of unreliable data
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// channels. Currently this class is specifically designed to use RtpDataEngine,
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// and will changed to use SCTP in the future.
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// DataChannel states:
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// kConnecting: The channel has been created but SSRC for sending and receiving
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// has not yet been set and the transport might not yet be ready.
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// kOpen: The channel have a local SSRC set by a call to UpdateSendSsrc
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// and a remote SSRC set by call to UpdateReceiveSsrc and the transport
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// has been writable once.
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// kClosing: DataChannelInterface::Close has been called or UpdateReceiveSsrc
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// has been called with SSRC==0
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// kClosed: Both UpdateReceiveSsrc and UpdateSendSsrc has been called with
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// SSRC==0.
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class DataChannel : public DataChannelInterface,
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public sigslot::has_slots<> {
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public:
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static talk_base::scoped_refptr<DataChannel> Create(
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WebRtcSession* session,
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const std::string& label,
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const DataChannelInit* config);
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virtual void RegisterObserver(DataChannelObserver* observer);
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virtual void UnregisterObserver();
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virtual std::string label() const { return label_; }
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virtual bool reliable() const;
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virtual int id() const { return config_.id; }
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virtual uint64 buffered_amount() const;
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virtual void Close();
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virtual DataState state() const { return state_; }
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virtual bool Send(const DataBuffer& buffer);
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// Set the SSRC this channel should use to receive data from the
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// underlying data engine.
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void SetReceiveSsrc(uint32 receive_ssrc);
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// The remote peer request that this channel should be closed.
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void RemotePeerRequestClose();
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// Set the SSRC this channel should use to send data on the
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// underlying data engine. |send_ssrc| == 0 means that the channel is no
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// longer part of the session negotiation.
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void SetSendSsrc(uint32 send_ssrc);
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// Called if the underlying data engine is closing.
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void OnDataEngineClose();
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protected:
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DataChannel(WebRtcSession* session, const std::string& label);
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virtual ~DataChannel();
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bool Init(const DataChannelInit* config);
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bool HasNegotiationCompleted();
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// Sigslots from cricket::DataChannel
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void OnDataReceived(cricket::DataChannel* channel,
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const cricket::ReceiveDataParams& params,
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const talk_base::Buffer& payload);
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void OnChannelReady(bool writable);
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private:
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void DoClose();
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void UpdateState();
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void SetState(DataState state);
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void ConnectToDataSession();
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void DisconnectFromDataSession();
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bool IsConnectedToDataSession() { return data_session_ != NULL; }
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void DeliverQueuedData();
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void ClearQueuedData();
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std::string label_;
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DataChannelInit config_;
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DataChannelObserver* observer_;
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DataState state_;
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bool was_ever_writable_;
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WebRtcSession* session_;
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cricket::DataChannel* data_session_;
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bool send_ssrc_set_;
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uint32 send_ssrc_;
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bool receive_ssrc_set_;
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uint32 receive_ssrc_;
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std::queue<DataBuffer*> queued_data_;
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};
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class DataChannelFactory {
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public:
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virtual talk_base::scoped_refptr<DataChannel> CreateDataChannel(
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const std::string& label,
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const DataChannelInit* config) = 0;
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protected:
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virtual ~DataChannelFactory() {}
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};
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// Define proxy for DataChannelInterface.
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BEGIN_PROXY_MAP(DataChannel)
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PROXY_METHOD1(void, RegisterObserver, DataChannelObserver*)
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PROXY_METHOD0(void, UnregisterObserver)
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PROXY_CONSTMETHOD0(std::string, label)
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PROXY_CONSTMETHOD0(bool, reliable)
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PROXY_CONSTMETHOD0(int, id)
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PROXY_CONSTMETHOD0(DataState, state)
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PROXY_CONSTMETHOD0(uint64, buffered_amount)
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PROXY_METHOD0(void, Close)
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PROXY_METHOD1(bool, Send, const DataBuffer&)
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END_PROXY()
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} // namespace webrtc
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#endif // TALK_APP_WEBRTC_DATACHANNEL_H_
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