Remove BaseChannel's dependency on TransportController.

webrtc/pc/channel.cc

 /*
  *  Copyright 2004 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 143 matching lines @@
 template <class Codec>
 void RtpSendParametersFromMediaDescription(
     const MediaContentDescriptionImpl<Codec>* desc,
     RtpSendParameters<Codec>* send_params) {
   RtpParametersFromMediaDescription(desc, send_params);
   send_params->max_bandwidth_bps = desc->bandwidth();
 }
 
 BaseChannel::BaseChannel(rtc::Thread* worker_thread,
                          rtc::Thread* network_thread,
+                         rtc::Thread* signaling_thread,
                          MediaChannel* media_channel,
-                         TransportController* transport_controller,
                          const std::string& content_name,
                          bool rtcp,
                          bool srtp_required)
     : worker_thread_(worker_thread),
       network_thread_(network_thread),
-
+      signaling_thread_(signaling_thread),
       content_name_(content_name),
-
-      transport_controller_(transport_controller),
       rtcp_enabled_(rtcp),
       srtp_required_(srtp_required),
       media_channel_(media_channel),
       selected_candidate_pair_(nullptr) {
   RTC_DCHECK(worker_thread_ == rtc::Thread::Current());
-  if (transport_controller) {
-    RTC_DCHECK_EQ(network_thread, transport_controller->network_thread());
-  }
   LOG(LS_INFO) << "Created channel for " << content_name;
 }
 
 BaseChannel::~BaseChannel() {
   TRACE_EVENT0("webrtc", "BaseChannel::~BaseChannel");
   RTC_DCHECK(worker_thread_ == rtc::Thread::Current());
   Deinit();
   StopConnectionMonitor();
   // Eats any outstanding messages or packets.
   worker_thread_->Clear(&invoker_);
   worker_thread_->Clear(this);
   // We must destroy the media channel before the transport channel, otherwise
   // the media channel may try to send on the dead transport channel. NULLing
   // is not an effective strategy since the sends will come on another thread.
   delete media_channel_;
   // Note that we don't just call SetTransportChannel_n(nullptr) because that
   // would call a pure virtual method which we can't do from a destructor.
   network_thread_->Invoke<void>(
       RTC_FROM_HERE, Bind(&BaseChannel::DestroyTransportChannels_n, this));
   LOG(LS_INFO) << "Destroyed channel";
 }
 
 void BaseChannel::DisconnectTransportChannels_n() {
   // Send any outstanding RTCP packets.
   FlushRtcpMessages_n();
 
   // Stop signals from transport channels, but keep them alive because
   // media_channel may use them from a different thread.
-  if (transport_channel_) {
-    DisconnectFromTransportChannel(transport_channel_);
+  if (rtp_transport_) {
+    DisconnectFromTransportChannel(rtp_transport_);
   }
-  if (rtcp_transport_channel_) {
-    DisconnectFromTransportChannel(rtcp_transport_channel_);
+  if (rtcp_transport_) {
+    DisconnectFromTransportChannel(rtcp_transport_);
   }
 
   // Clear pending read packets/messages.
   network_thread_->Clear(&invoker_);
   network_thread_->Clear(this);
 }
 
 void BaseChannel::DestroyTransportChannels_n() {
-  if (transport_channel_) {
-    transport_controller_->DestroyTransportChannel_n(
-        transport_name_, cricket::ICE_CANDIDATE_COMPONENT_RTP);
+  if (rtp_transport_) {
+    SignalDestroyTransport(transport_name_,
+                           cricket::ICE_CANDIDATE_COMPONENT_RTP);
   }
-  if (rtcp_transport_channel_) {
-    transport_controller_->DestroyTransportChannel_n(
-        transport_name_, cricket::ICE_CANDIDATE_COMPONENT_RTCP);
+  if (rtcp_transport_) {
+    SignalDestroyTransport(transport_name_,
+                           cricket::ICE_CANDIDATE_COMPONENT_RTCP);
   }
   // Clear pending send packets/messages.
   network_thread_->Clear(&invoker_);
   network_thread_->Clear(this);
 }
 
-bool BaseChannel::Init_w(const std::string* bundle_transport_name) {
+bool BaseChannel::Init_w(TransportChannel* rtp_transport,
+                         TransportChannel* rtcp_transport) {
   if (!network_thread_->Invoke<bool>(
-          RTC_FROM_HERE,
-          Bind(&BaseChannel::InitNetwork_n, this, bundle_transport_name))) {
+          RTC_FROM_HERE, Bind(&BaseChannel::InitNetwork_n, this, rtp_transport,
+                              rtcp_transport))) {
     return false;
   }
 
   // Both RTP and RTCP channels are set, we can call SetInterface on
   // media channel and it can set network options.
   RTC_DCHECK(worker_thread_->IsCurrent());
   media_channel_->SetInterface(this);
   return true;
 }
 
-bool BaseChannel::InitNetwork_n(const std::string* bundle_transport_name) {
+bool BaseChannel::InitNetwork_n(TransportChannel* rtp_transport,
+                                TransportChannel* rtcp_transport) {
   RTC_DCHECK(network_thread_->IsCurrent());
-  const std::string& transport_name =
-      (bundle_transport_name ? *bundle_transport_name : content_name());
-  if (!SetTransport_n(transport_name)) {
+  //  const std::string& transport_name =
+  //      (bundle_transport_name ? *bundle_transport_name : content_name());
+  if (!SetTransport_n(rtp_transport, rtcp_transport)) {
     return false;
   }
 
-  if (!SetDtlsSrtpCryptoSuites_n(transport_channel_, false)) {
+  if (!SetDtlsSrtpCryptoSuites_n(rtp_transport_, false)) {
     return false;
   }
-  if (rtcp_transport_channel_ &&
-      !SetDtlsSrtpCryptoSuites_n(rtcp_transport_channel_, true)) {
+  if (rtcp_transport_ && !SetDtlsSrtpCryptoSuites_n(rtcp_transport_, true)) {
     return false;
   }
   return true;
 }
 
 void BaseChannel::Deinit() {
   RTC_DCHECK(worker_thread_->IsCurrent());
   media_channel_->SetInterface(NULL);
   // Packets arrive on the network thread, processing packets calls virtual
   // functions, so need to stop this process in Deinit that is called in
   // derived classes destructor.
   network_thread_->Invoke<void>(
       RTC_FROM_HERE, Bind(&BaseChannel::DisconnectTransportChannels_n, this));
 }
 
-bool BaseChannel::SetTransport(const std::string& transport_name) {
+bool BaseChannel::SetTransport(TransportChannel* rtp_transport,
+                               TransportChannel* rtcp_transport) {
   return network_thread_->Invoke<bool>(
-      RTC_FROM_HERE, Bind(&BaseChannel::SetTransport_n, this, transport_name));
+      RTC_FROM_HERE,
+      Bind(&BaseChannel::SetTransport_n, this, rtp_transport, rtcp_transport));
 }
 
-bool BaseChannel::SetTransport_n(const std::string& transport_name) {
+bool BaseChannel::SetTransport_n(TransportChannel* rtp_transport,
+                                 TransportChannel* rtcp_transport) {
   RTC_DCHECK(network_thread_->IsCurrent());
+  if (!rtp_transport && rtcp_transport) {
+    LOG(LS_WARNING) << "Setting nullptr to RTP Transport and RTCP Transport.";

[Taylor Brandstetter, 2017/01/09 22:50:42]

It seems like this should never happen. Change log level to error and return
false?

[Zhi Huang, 2017/01/12 03:47:46]

Done.

+    return true;
+  }
 
-  if (transport_name == transport_name_) {
+  if (rtcp_transport) {
+    RTC_DCHECK(rtp_transport->transport_name() ==
+               rtcp_transport->transport_name());

[Taylor Brandstetter, 2017/01/09 22:50:42]

Could also RTC_DCHECK that ShouldCreateRtcpTransport returns true.

[Zhi Huang, 2017/01/12 03:47:46]

Done.

+  }
+
+  if (rtp_transport->transport_name() == transport_name_) {
     // Nothing to do if transport name isn't changing.
     return true;
   }
 
   // When using DTLS-SRTP, we must reset the SrtpFilter every time the transport
   // changes and wait until the DTLS handshake is complete to set the newly
   // negotiated parameters.
   if (ShouldSetupDtlsSrtp_n()) {
     // Set |writable_| to false such that UpdateWritableState_w can set up
     // DTLS-SRTP when |writable_| becomes true again.
     writable_ = false;
     srtp_filter_.ResetParams();
   }
 
   // If this BaseChannel uses RTCP and we haven't fully negotiated RTCP mux,
   // we need an RTCP channel.
-  if (rtcp_enabled_ && !rtcp_mux_filter_.IsFullyActive()) {
-    LOG(LS_INFO) << "Create RTCP TransportChannel for " << content_name()
-                 << " on " << transport_name << " transport ";
-    SetTransportChannel_n(
-        true, transport_controller_->CreateTransportChannel_n(
-                  transport_name, cricket::ICE_CANDIDATE_COMPONENT_RTCP));
-    if (!rtcp_transport_channel_) {
+  if (ShouldCreateRtcpTransport()) {
+    LOG(LS_INFO) << "Create RTCP Transport for " << content_name() << " on "

[Taylor Brandstetter, 2017/01/09 22:50:42]

Should update log statements; is now "setting" instead of "creating"

[Zhi Huang, 2017/01/12 03:47:46]

Done.

+                 << transport_name() << " transport ";
+    SetTransportChannel_n(true, rtcp_transport);
+    if (!rtcp_transport_) {
       return false;
     }
   }
 
   LOG(LS_INFO) << "Create non-RTCP TransportChannel for " << content_name()
-               << " on " << transport_name << " transport ";
-  SetTransportChannel_n(
-      false, transport_controller_->CreateTransportChannel_n(
-                 transport_name, cricket::ICE_CANDIDATE_COMPONENT_RTP));
-  if (!transport_channel_) {
+               << " on " << transport_name() << " transport ";
+  SetTransportChannel_n(false, rtp_transport);
+  if (!rtp_transport_) {
     return false;
   }
 
-  transport_name_ = transport_name;
+  transport_name_ = rtp_transport->transport_name();
 
   // Update aggregate writable/ready-to-send state between RTP and RTCP upon
   // setting new transport channels.
   UpdateWritableState_n();
   // We can only update ready-to-send after updating writability.
   //
   // On setting a new channel, assume it's ready to send if it's writable,
   // because we have no way of knowing otherwise (the channel doesn't give us
   // "was last send successful?").
   //
   // This won't always be accurate (the last SendPacket call from another
   // BaseChannel could have resulted in an error), but even so, we'll just
   // encounter the error again and update "ready to send" accordingly.
+  SetTransportChannelReadyToSend(false,
+                                 rtp_transport_ && rtp_transport_->writable());
   SetTransportChannelReadyToSend(
-      false, transport_channel_ && transport_channel_->writable());
-  SetTransportChannelReadyToSend(
-      true, rtcp_transport_channel_ && rtcp_transport_channel_->writable());
+      true, rtcp_transport_ && rtcp_transport_->writable());
   return true;
 }
 
 void BaseChannel::SetTransportChannel_n(bool rtcp,
-                                        TransportChannel* new_channel) {
+                                        TransportChannel* new_transport) {
   RTC_DCHECK(network_thread_->IsCurrent());
-  TransportChannel*& old_channel =
-      rtcp ? rtcp_transport_channel_ : transport_channel_;
+  TransportChannel*& old_transport = rtcp ? rtcp_transport_ : rtp_transport_;
 
-  if (!old_channel && !new_channel) {
+  if (!old_transport && !new_transport) {
     // Nothing to do.
     return;
   }
-  RTC_DCHECK(old_channel != new_channel);
+  RTC_DCHECK(old_transport != new_transport);
 
-  if (old_channel) {
-    DisconnectFromTransportChannel(old_channel);
-    transport_controller_->DestroyTransportChannel_n(
-        transport_name_, rtcp ? cricket::ICE_CANDIDATE_COMPONENT_RTCP
-                              : cricket::ICE_CANDIDATE_COMPONENT_RTP);
+  if (old_transport) {
+    DisconnectFromTransportChannel(old_transport);
+    SignalDestroyTransport(transport_name_,
+                           rtcp ? cricket::ICE_CANDIDATE_COMPONENT_RTCP
+                                : cricket::ICE_CANDIDATE_COMPONENT_RTP);
   }
 
-  old_channel = new_channel;
+  old_transport = new_transport;
 
-  if (new_channel) {
+  if (new_transport) {
     if (rtcp) {
       RTC_CHECK(!(ShouldSetupDtlsSrtp_n() && srtp_filter_.IsActive()))
           << "Setting RTCP for DTLS/SRTP after SrtpFilter is active "
           << "should never happen.";
     }
-    ConnectToTransportChannel(new_channel);
+    ConnectToTransportChannel(new_transport);
     auto& socket_options = rtcp ? rtcp_socket_options_ : socket_options_;
     for (const auto& pair : socket_options) {
-      new_channel->SetOption(pair.first, pair.second);
+      new_transport->SetOption(pair.first, pair.second);
     }
   }
 }
 
 void BaseChannel::ConnectToTransportChannel(TransportChannel* tc) {
   RTC_DCHECK(network_thread_->IsCurrent());
 
   tc->SignalWritableState.connect(this, &BaseChannel::OnWritableState);
   tc->SignalReadPacket.connect(this, &BaseChannel::OnPacketRead);
   tc->SignalReadyToSend.connect(this, &BaseChannel::OnReadyToSend);
@@ skipping 53 matching lines @@
 
 bool BaseChannel::SetRemoteContent(const MediaContentDescription* content,
                                    ContentAction action,
                                    std::string* error_desc) {
   TRACE_EVENT0("webrtc", "BaseChannel::SetRemoteContent");
   return InvokeOnWorker(RTC_FROM_HERE, Bind(&BaseChannel::SetRemoteContent_w,
                                             this, content, action, error_desc));
 }
 
 void BaseChannel::StartConnectionMonitor(int cms) {
-  // We pass in the BaseChannel instead of the transport_channel_
-  // because if the transport_channel_ changes, the ConnectionMonitor
+  // We pass in the BaseChannel instead of the rtp_transport_
+  // because if the rtp_transport_ changes, the ConnectionMonitor
   // would be pointing to the wrong TransportChannel.
   // We pass in the network thread because on that thread connection monitor
   // will call BaseChannel::GetConnectionStats which must be called on the
   // network thread.
   connection_monitor_.reset(
       new ConnectionMonitor(this, network_thread(), rtc::Thread::Current()));
   connection_monitor_->SignalUpdate.connect(
       this, &BaseChannel::OnConnectionMonitorUpdate);
   connection_monitor_->Start(cms);
 }
 
 void BaseChannel::StopConnectionMonitor() {
   if (connection_monitor_) {
     connection_monitor_->Stop();
     connection_monitor_.reset();
   }
 }
 
 bool BaseChannel::GetConnectionStats(ConnectionInfos* infos) {
   RTC_DCHECK(network_thread_->IsCurrent());
-  return transport_channel_->GetStats(infos);
+  return rtp_transport_->GetStats(infos);
+}
+
+bool BaseChannel::ShouldCreateRtcpTransport() {

[Taylor Brandstetter, 2017/01/09 22:50:42]

nit: Would "NeedsRtcpTransport" be a more fitting name, since it isn't actually
created here? Just a thought.

[Zhi Huang, 2017/01/12 03:47:46]

Done.

+  return rtcp_enabled_ && !rtcp_mux_filter_.IsFullyActive();
 }
 
 bool BaseChannel::IsReadyToReceiveMedia_w() const {
   // Receive data if we are enabled and have local content,
   return enabled() && IsReceiveContentDirection(local_content_direction_);
 }
 
 bool BaseChannel::IsReadyToSendMedia_w() const {
   // Need to access some state updated on the network thread.
   return network_thread_->Invoke<bool>(
@@ skipping 25 matching lines @@
       RTC_FROM_HERE, Bind(&BaseChannel::SetOption_n, this, type, opt, value));
 }
 
 int BaseChannel::SetOption_n(SocketType type,
                              rtc::Socket::Option opt,
                              int value) {
   RTC_DCHECK(network_thread_->IsCurrent());
   TransportChannel* channel = nullptr;
   switch (type) {
     case ST_RTP:
-      channel = transport_channel_;
+      channel = rtp_transport_;
       socket_options_.push_back(
           std::pair<rtc::Socket::Option, int>(opt, value));
       break;
     case ST_RTCP:
-      channel = rtcp_transport_channel_;
+      channel = rtcp_transport_;
       rtcp_socket_options_.push_back(
           std::pair<rtc::Socket::Option, int>(opt, value));
       break;
   }
   return channel ? channel->SetOption(opt, value) : -1;
 }
 
 bool BaseChannel::SetCryptoOptions(const rtc::CryptoOptions& crypto_options) {
   crypto_options_ = crypto_options;
   return true;
 }
 
 void BaseChannel::OnWritableState(rtc::PacketTransportInterface* transport) {
-  RTC_DCHECK(transport == transport_channel_ ||
-             transport == rtcp_transport_channel_);
+  RTC_DCHECK(transport == rtp_transport_ || transport == rtcp_transport_);
   RTC_DCHECK(network_thread_->IsCurrent());
   UpdateWritableState_n();
 }
 
 void BaseChannel::OnPacketRead(rtc::PacketTransportInterface* transport,
                                const char* data,
                                size_t len,
                                const rtc::PacketTime& packet_time,
                                int flags) {
   TRACE_EVENT0("webrtc", "BaseChannel::OnPacketRead");
   // OnPacketRead gets called from P2PSocket; now pass data to MediaEngine
   RTC_DCHECK(network_thread_->IsCurrent());
 
   // When using RTCP multiplexing we might get RTCP packets on the RTP
   // transport. We feed RTP traffic into the demuxer to determine if it is RTCP.
   bool rtcp = PacketIsRtcp(transport, data, len);
   rtc::CopyOnWriteBuffer packet(data, len);
   HandlePacket(rtcp, &packet, packet_time);
 }
 
 void BaseChannel::OnReadyToSend(rtc::PacketTransportInterface* transport) {
-  RTC_DCHECK(transport == transport_channel_ ||
-             transport == rtcp_transport_channel_);
-  SetTransportChannelReadyToSend(transport == rtcp_transport_channel_, true);
+  RTC_DCHECK(transport == rtp_transport_ || transport == rtcp_transport_);
+  SetTransportChannelReadyToSend(transport == rtcp_transport_, true);
 }
 
 void BaseChannel::OnDtlsState(TransportChannel* channel,
                               DtlsTransportState state) {
   if (!ShouldSetupDtlsSrtp_n()) {
     return;
   }
 
   // Reset the srtp filter if it's not the CONNECTED state. For the CONNECTED
   // state, setting up DTLS-SRTP context is deferred to ChannelWritable_w to
   // cover other scenarios like the whole channel is writable (not just this
   // TransportChannel) or when TransportChannel is attached after DTLS is
   // negotiated.
   if (state != DTLS_TRANSPORT_CONNECTED) {
     srtp_filter_.ResetParams();
   }
 }
 
 void BaseChannel::OnSelectedCandidatePairChanged(
     TransportChannel* channel,
     CandidatePairInterface* selected_candidate_pair,
     int last_sent_packet_id,
     bool ready_to_send) {
-  RTC_DCHECK(channel == transport_channel_ ||
-             channel == rtcp_transport_channel_);
+  RTC_DCHECK(channel == rtp_transport_ || channel == rtcp_transport_);
   RTC_DCHECK(network_thread_->IsCurrent());
   selected_candidate_pair_ = selected_candidate_pair;
   std::string transport_name = channel->transport_name();
   rtc::NetworkRoute network_route;
   if (selected_candidate_pair) {
     network_route = rtc::NetworkRoute(
         ready_to_send, selected_candidate_pair->local_candidate().network_id(),
         selected_candidate_pair->remote_candidate().network_id(),
         last_sent_packet_id);
 
     UpdateTransportOverhead();
   }
   invoker_.AsyncInvoke<void>(
       RTC_FROM_HERE, worker_thread_,
       Bind(&MediaChannel::OnNetworkRouteChanged, media_channel_, transport_name,
            network_route));
 }
 
 void BaseChannel::SetTransportChannelReadyToSend(bool rtcp, bool ready) {
   RTC_DCHECK(network_thread_->IsCurrent());
   if (rtcp) {
     rtcp_ready_to_send_ = ready;
   } else {
     rtp_ready_to_send_ = ready;
   }
 
   bool ready_to_send =
       (rtp_ready_to_send_ &&
-       // In the case of rtcp mux |rtcp_transport_channel_| will be null.
-       (rtcp_ready_to_send_ || !rtcp_transport_channel_));
+       // In the case of rtcp mux |rtcp_transport_| will be null.
+       (rtcp_ready_to_send_ || !rtcp_transport_));
 
   invoker_.AsyncInvoke<void>(
       RTC_FROM_HERE, worker_thread_,
       Bind(&MediaChannel::OnReadyToSend, media_channel_, ready_to_send));
 }
 
 bool BaseChannel::PacketIsRtcp(const rtc::PacketTransportInterface* transport,
                                const char* data,
                                size_t len) {
-  return (transport == rtcp_transport_channel_ ||
+  return (transport == rtcp_transport_ ||
           rtcp_mux_filter_.DemuxRtcp(data, static_cast<int>(len)));
 }
 
 bool BaseChannel::SendPacket(bool rtcp,
                              rtc::CopyOnWriteBuffer* packet,
                              const rtc::PacketOptions& options) {
   // SendPacket gets called from MediaEngine, on a pacer or an encoder thread.
   // If the thread is not our network thread, we will post to our network
   // so that the real work happens on our network. This avoids us having to
   // synchronize access to all the pieces of the send path, including
   // SRTP and the inner workings of the transport channels.
   // The only downside is that we can't return a proper failure code if
   // needed. Since UDP is unreliable anyway, this should be a non-issue.
   if (!network_thread_->IsCurrent()) {
     // Avoid a copy by transferring the ownership of the packet data.
     int message_id = rtcp ? MSG_SEND_RTCP_PACKET : MSG_SEND_RTP_PACKET;
     SendPacketMessageData* data = new SendPacketMessageData;
     data->packet = std::move(*packet);
     data->options = options;
     network_thread_->Post(RTC_FROM_HERE, this, message_id, data);
     return true;
   }
   TRACE_EVENT0("webrtc", "BaseChannel::SendPacket");
 
   // Now that we are on the correct thread, ensure we have a place to send this
   // packet before doing anything. (We might get RTCP packets that we don't
   // intend to send.) If we've negotiated RTCP mux, send RTCP over the RTP
   // transport.
-  TransportChannel* channel = (!rtcp || rtcp_mux_filter_.IsActive()) ?
-      transport_channel_ : rtcp_transport_channel_;
+  TransportChannel* channel =
+      (!rtcp || rtcp_mux_filter_.IsActive()) ? rtp_transport_ : rtcp_transport_;
   if (!channel || !channel->writable()) {
     return false;
   }
 
   // Protect ourselves against crazy data.
   if (!ValidPacket(rtcp, packet)) {
     LOG(LS_ERROR) << "Dropping outgoing " << content_name_ << " "
                   << PacketType(rtcp)
                   << " packet: wrong size=" << packet->size();
     return false;
@@ skipping 227 matching lines @@
   RTC_DCHECK(worker_thread_ == rtc::Thread::Current());
   if (!enabled_)
     return;
 
   LOG(LS_INFO) << "Channel disabled";
   enabled_ = false;
   UpdateMediaSendRecvState_w();
 }
 
 void BaseChannel::UpdateWritableState_n() {
-  if (transport_channel_ && transport_channel_->writable() &&
-      (!rtcp_transport_channel_ || rtcp_transport_channel_->writable())) {
+  if (rtp_transport_ && rtp_transport_->writable() &&
+      (!rtcp_transport_ || rtcp_transport_->writable())) {
     ChannelWritable_n();
   } else {
     ChannelNotWritable_n();
   }
 }
 
 void BaseChannel::ChannelWritable_n() {
   RTC_DCHECK(network_thread_->IsCurrent());
   if (writable_) {
     return;
@@ skipping 34 matching lines @@
   if (!rtcp) {
     GetSrtpCryptoSuites_n(&crypto_suites);
   } else {
     GetDefaultSrtpCryptoSuites(crypto_options(), &crypto_suites);
   }
   return tc->SetSrtpCryptoSuites(crypto_suites);
 }
 
 bool BaseChannel::ShouldSetupDtlsSrtp_n() const {
   // Since DTLS is applied to all channels, checking RTP should be enough.
-  return transport_channel_ && transport_channel_->IsDtlsActive();
+  return rtp_transport_ && rtp_transport_->IsDtlsActive();
 }
 
 // This function returns true if either DTLS-SRTP is not in use
 // *or* DTLS-SRTP is successfully set up.
 bool BaseChannel::SetupDtlsSrtp_n(bool rtcp_channel) {
   RTC_DCHECK(network_thread_->IsCurrent());
   bool ret = false;
 
-  TransportChannel* channel =
-      rtcp_channel ? rtcp_transport_channel_ : transport_channel_;
+  TransportChannel* channel = rtcp_channel ? rtcp_transport_ : rtp_transport_;
 
   RTC_DCHECK(channel->IsDtlsActive());
 
   int selected_crypto_suite;
 
   if (!channel->GetSrtpCryptoSuite(&selected_crypto_suite)) {
     LOG(LS_ERROR) << "No DTLS-SRTP selected crypto suite";
     return false;
   }
 
@@ skipping 77 matching lines @@
 
   if (!ShouldSetupDtlsSrtp_n()) {
     return;
   }
 
   if (!SetupDtlsSrtp_n(false)) {
     SignalDtlsSetupFailure_n(false);
     return;
   }
 
-  if (rtcp_transport_channel_) {
+  if (rtcp_transport_) {
     if (!SetupDtlsSrtp_n(true)) {
       SignalDtlsSetupFailure_n(true);
       return;
     }
   }
 }
 
 void BaseChannel::ChannelNotWritable_n() {
   RTC_DCHECK(network_thread_->IsCurrent());
   if (!writable_)
@@ skipping 36 matching lines @@
   }
 
   return true;
 }
 
 // |dtls| will be set to true if DTLS is active for transport channel and
 // crypto is empty.
 bool BaseChannel::CheckSrtpConfig_n(const std::vector<CryptoParams>& cryptos,
                                     bool* dtls,
                                     std::string* error_desc) {
-  *dtls = transport_channel_->IsDtlsActive();
+  *dtls = rtp_transport_->IsDtlsActive();
   if (*dtls && !cryptos.empty()) {
     SafeSetError("Cryptos must be empty when DTLS is active.", error_desc);
     return false;
   }
   return true;
 }
 
 bool BaseChannel::SetSrtp_n(const std::vector<CryptoParams>& cryptos,
                             ContentAction action,
                             ContentSource src,
@@ skipping 92 matching lines @@
   }
   if (!ret) {
     SafeSetError("Failed to setup RTCP mux filter.", error_desc);
     return false;
   }
   // |rtcp_mux_filter_| can be active if |action| is CA_PRANSWER or
   // CA_ANSWER, but we only want to tear down the RTCP transport channel if we
   // received a final answer.
   if (rtcp_mux_filter_.IsActive()) {
     // If the RTP transport is already writable, then so are we.
-    if (transport_channel_->writable()) {
+    if (rtp_transport_->writable()) {
       ChannelWritable_n();
     }
   }
 
   return true;
 }
 
 bool BaseChannel::AddRecvStream_w(const StreamParams& sp) {
   RTC_DCHECK(worker_thread() == rtc::Thread::Current());
   return media_channel()->AddRecvStream(sp);
@@ skipping 214 matching lines @@
       rtc::Bind(&BaseChannel::SignalSentPacket_w, this, sent_packet));
 }
 
 void BaseChannel::SignalSentPacket_w(const rtc::SentPacket& sent_packet) {
   RTC_DCHECK(worker_thread_->IsCurrent());
   SignalSentPacket(sent_packet);
 }
 
 VoiceChannel::VoiceChannel(rtc::Thread* worker_thread,
                            rtc::Thread* network_thread,
+                           rtc::Thread* signaling_thread,
                            MediaEngineInterface* media_engine,
                            VoiceMediaChannel* media_channel,
-                           TransportController* transport_controller,
                            const std::string& content_name,
                            bool rtcp,
                            bool srtp_required)
     : BaseChannel(worker_thread,
                   network_thread,
+                  signaling_thread,
                   media_channel,
-                  transport_controller,
                   content_name,
                   rtcp,
                   srtp_required),
       media_engine_(media_engine),
       received_media_(false) {}
 
 VoiceChannel::~VoiceChannel() {
   TRACE_EVENT0("webrtc", "VoiceChannel::~VoiceChannel");
   StopAudioMonitor();
   StopMediaMonitor();
   // this can't be done in the base class, since it calls a virtual
   DisableMedia_w();
   Deinit();
 }
 
-bool VoiceChannel::Init_w(const std::string* bundle_transport_name) {
-  if (!BaseChannel::Init_w(bundle_transport_name)) {
-    return false;
-  }
-  return true;
+bool VoiceChannel::Init_w(TransportChannel* rtp_transport,
+                          TransportChannel* rtcp_transport) {
+  return BaseChannel::Init_w(rtp_transport, rtcp_transport);
 }
 
 bool VoiceChannel::SetAudioSend(uint32_t ssrc,
                                 bool enable,
                                 const AudioOptions* options,
                                 AudioSource* source) {
   return InvokeOnWorker(RTC_FROM_HERE,
                         Bind(&VoiceMediaChannel::SetAudioSend, media_channel(),
                              ssrc, enable, options, source));
 }
@@ skipping 366 matching lines @@
   SignalAudioMonitor(this, info);
 }
 
 void VoiceChannel::GetSrtpCryptoSuites_n(
     std::vector<int>* crypto_suites) const {
   GetSupportedAudioCryptoSuites(crypto_options(), crypto_suites);
 }
 
 VideoChannel::VideoChannel(rtc::Thread* worker_thread,
                            rtc::Thread* network_thread,
+                           rtc::Thread* signaling_thread,
                            VideoMediaChannel* media_channel,
-                           TransportController* transport_controller,
                            const std::string& content_name,
                            bool rtcp,
                            bool srtp_required)
     : BaseChannel(worker_thread,
                   network_thread,
+                  signaling_thread,
                   media_channel,
-                  transport_controller,
                   content_name,
                   rtcp,
                   srtp_required) {}
 
-bool VideoChannel::Init_w(const std::string* bundle_transport_name) {
-  if (!BaseChannel::Init_w(bundle_transport_name)) {
-    return false;
-  }
-  return true;
+bool VideoChannel::Init_w(TransportChannel* rtp_transport,
+                          TransportChannel* rtcp_transport) {
+  return BaseChannel::Init_w(rtp_transport, rtcp_transport);
 }
 
 VideoChannel::~VideoChannel() {
   TRACE_EVENT0("webrtc", "VideoChannel::~VideoChannel");
   StopMediaMonitor();
   // this can't be done in the base class, since it calls a virtual
   DisableMedia_w();
 
   Deinit();
 }
@@ skipping 225 matching lines @@
   SignalMediaMonitor(this, info);
 }
 
 void VideoChannel::GetSrtpCryptoSuites_n(
     std::vector<int>* crypto_suites) const {
   GetSupportedVideoCryptoSuites(crypto_options(), crypto_suites);
 }
 
 DataChannel::DataChannel(rtc::Thread* worker_thread,
                          rtc::Thread* network_thread,
+                         rtc::Thread* signaling_thread,
                          DataMediaChannel* media_channel,
-                         TransportController* transport_controller,
                          const std::string& content_name,
                          bool rtcp,
                          bool srtp_required)
     : BaseChannel(worker_thread,
                   network_thread,
+                  signaling_thread,
                   media_channel,
-                  transport_controller,
                   content_name,
                   rtcp,
                   srtp_required),
       data_channel_type_(cricket::DCT_NONE),
       ready_to_send_data_(false) {}
 
 DataChannel::~DataChannel() {
   TRACE_EVENT0("webrtc", "DataChannel::~DataChannel");
   StopMediaMonitor();
   // this can't be done in the base class, since it calls a virtual
   DisableMedia_w();
 
   Deinit();
 }
 
-bool DataChannel::Init_w(const std::string* bundle_transport_name) {
-  if (!BaseChannel::Init_w(bundle_transport_name)) {
+bool DataChannel::Init_w(TransportChannel* rtp_transport,
+                         TransportChannel* rtcp_transport) {
+  if (!BaseChannel::Init_w(rtp_transport, rtcp_transport)) {
     return false;
   }
   media_channel()->SignalDataReceived.connect(
       this, &DataChannel::OnDataReceived);
   media_channel()->SignalReadyToSend.connect(
       this, &DataChannel::OnDataChannelReadyToSend);
   media_channel()->SignalStreamClosedRemotely.connect(
       this, &DataChannel::OnStreamClosedRemotely);
   return true;
 }
@@ skipping 279 matching lines @@
 }
 
 void DataChannel::OnStreamClosedRemotely(uint32_t sid) {
   rtc::TypedMessageData<uint32_t>* message =
       new rtc::TypedMessageData<uint32_t>(sid);
   signaling_thread()->Post(RTC_FROM_HERE, this, MSG_STREAMCLOSEDREMOTELY,
                            message);
 }
 
 }  // namespace cricket