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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef REMOTING_PROTOCOL_WEBRTC_TRANSPORT_H_
#define REMOTING_PROTOCOL_WEBRTC_TRANSPORT_H_
#include <memory>
#include <string>
#include <vector>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/thread_checker.h"
#include "base/timer/timer.h"
#include "crypto/hmac.h"
#include "remoting/protocol/transport.h"
#include "remoting/protocol/webrtc_data_stream_adapter.h"
#include "remoting/protocol/webrtc_dummy_video_encoder.h"
#include "remoting/signaling/signal_strategy.h"
#include "third_party/webrtc/api/peerconnectioninterface.h"
namespace remoting {
namespace protocol {
class TransportContext;
class MessagePipe;
class WebrtcAudioModule;
class WebrtcTransport : public Transport {
public:
class EventHandler {
public:
// Called after |peer_connection| has been created but before handshake. The
// handler should create data channels and media streams. Renegotiation will
// be required in two cases after this method returns:
// 1. When the first data channel is created, if it wasn't created by this
// event handler.
// 2. Whenever a media stream is added or removed.
virtual void OnWebrtcTransportConnecting() = 0;
// Called when the transport is connected.
virtual void OnWebrtcTransportConnected() = 0;
// Called when there is an error connecting the session.
virtual void OnWebrtcTransportError(ErrorCode error) = 0;
// Called when a new data channel is created by the peer.
virtual void OnWebrtcTransportIncomingDataChannel(
const std::string& name,
std::unique_ptr<MessagePipe> pipe) = 0;
// Called when an incoming media stream is added or removed.
virtual void OnWebrtcTransportMediaStreamAdded(
scoped_refptr<webrtc::MediaStreamInterface> stream) = 0;
virtual void OnWebrtcTransportMediaStreamRemoved(
scoped_refptr<webrtc::MediaStreamInterface> stream) = 0;
protected:
virtual ~EventHandler() {}
};
WebrtcTransport(rtc::Thread* worker_thread,
scoped_refptr<TransportContext> transport_context,
EventHandler* event_handler);
~WebrtcTransport() override;
webrtc::PeerConnectionInterface* peer_connection();
webrtc::PeerConnectionFactoryInterface* peer_connection_factory();
WebrtcDummyVideoEncoderFactory* video_encoder_factory() {
return video_encoder_factory_;
}
WebrtcAudioModule* audio_module();
// Creates outgoing data channel. The channel is created in CONNECTING state.
// The caller must wait for OnMessagePipeOpen() notification before sending
// any messages.
std::unique_ptr<MessagePipe> CreateOutgoingChannel(const std::string& name);
// Transport interface.
void Start(Authenticator* authenticator,
SendTransportInfoCallback send_transport_info_callback) override;
bool ProcessTransportInfo(buzz::XmlElement* transport_info) override;
void Close(ErrorCode error);
private:
// PeerConnectionWrapper is responsible for PeerConnection creation,
// ownership. It passes all events to the corresponding methods below. This is
// necessary to make it possible to close and destroy PeerConnection
// asynchronously, as it may be on stack when the transport is destroyed.
class PeerConnectionWrapper;
friend class PeerConnectionWrapper;
void OnLocalSessionDescriptionCreated(
std::unique_ptr<webrtc::SessionDescriptionInterface> description,
const std::string& error);
void OnLocalDescriptionSet(bool success, const std::string& error);
void OnRemoteDescriptionSet(bool send_answer,
bool success,
const std::string& error);
// PeerConnection event handlers, called by PeerConnectionWrapper.
void OnSignalingChange(
webrtc::PeerConnectionInterface::SignalingState new_state);
void OnAddStream(
rtc::scoped_refptr<webrtc::MediaStreamInterface> stream);
void OnRemoveStream(
rtc::scoped_refptr<webrtc::MediaStreamInterface> stream);
void OnDataChannel(
rtc::scoped_refptr<webrtc::DataChannelInterface> data_channel);
void OnRenegotiationNeeded();
void OnIceConnectionChange(
webrtc::PeerConnectionInterface::IceConnectionState new_state);
void OnIceGatheringChange(
webrtc::PeerConnectionInterface::IceGatheringState new_state);
void OnIceCandidate(const webrtc::IceCandidateInterface* candidate);
void RequestNegotiation();
void SendOffer();
void EnsurePendingTransportInfoMessage();
void SendTransportInfo();
void AddPendingCandidatesIfPossible();
base::ThreadChecker thread_checker_;
scoped_refptr<TransportContext> transport_context_;
EventHandler* event_handler_ = nullptr;
SendTransportInfoCallback send_transport_info_callback_;
crypto::HMAC handshake_hmac_;
std::unique_ptr<PeerConnectionWrapper> peer_connection_wrapper_;
WebrtcDummyVideoEncoderFactory* video_encoder_factory_;
bool negotiation_pending_ = false;
bool connected_ = false;
std::unique_ptr<buzz::XmlElement> pending_transport_info_message_;
base::OneShotTimer transport_info_timer_;
std::vector<std::unique_ptr<webrtc::IceCandidateInterface>>
pending_incoming_candidates_;
base::WeakPtrFactory<WebrtcTransport> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(WebrtcTransport);
};
} // namespace protocol
} // namespace remoting
#endif // REMOTING_PROTOCOL_WEBRTC_TRANSPORT_H_
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