Remove the dependency of TransportChannel and TransportChannelImpl.

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.
  */
 
 #include <utility>
 
 #include "webrtc/pc/channel.h"
 
 #include "webrtc/api/call/audio_sink.h"
 #include "webrtc/base/bind.h"
 #include "webrtc/base/byteorder.h"
 #include "webrtc/base/checks.h"
 #include "webrtc/base/common.h"
 #include "webrtc/base/copyonwritebuffer.h"
 #include "webrtc/base/dscp.h"
 #include "webrtc/base/logging.h"
 #include "webrtc/base/networkroute.h"
 #include "webrtc/base/trace_event.h"
 #include "webrtc/media/base/mediaconstants.h"
 #include "webrtc/media/base/rtputils.h"
 #include "webrtc/p2p/base/packettransportinterface.h"
-#include "webrtc/p2p/base/transportchannel.h"
 #include "webrtc/pc/channelmanager.h"
 
 namespace cricket {
 using rtc::Bind;
 
 namespace {
 // See comment below for why we need to use a pointer to a unique_ptr.
 bool SetRawAudioSink_w(VoiceMediaChannel* channel,
                        uint32_t ssrc,
                        std::unique_ptr<webrtc::AudioSinkInterface>* sink) {
@@ skipping 152 matching lines @@
   delete media_channel_;
   LOG(LS_INFO) << "Destroyed channel: " << content_name_;
 }
 
 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 (rtp_transport_) {
-    DisconnectFromTransportChannel(rtp_transport_);
+  if (rtp_dtls_transport_) {
+    DisconnectFromTransport(rtp_dtls_transport_);
   }
-  if (rtcp_transport_) {
-    DisconnectFromTransportChannel(rtcp_transport_);
+  if (rtcp_dtls_transport_) {
+    DisconnectFromTransport(rtcp_dtls_transport_);
   }
 
   // Clear pending read packets/messages.
   network_thread_->Clear(&invoker_);
   network_thread_->Clear(this);
 }
 
-bool BaseChannel::Init_w(TransportChannel* rtp_transport,
-                         TransportChannel* rtcp_transport) {
+bool BaseChannel::Init_w(DtlsTransportInternal* rtp_dtls_transport,
+                         DtlsTransportInternal* rtcp_dtls_transport) {
   if (!network_thread_->Invoke<bool>(
-          RTC_FROM_HERE, Bind(&BaseChannel::InitNetwork_n, this, rtp_transport,
-                              rtcp_transport))) {
+          RTC_FROM_HERE, Bind(&BaseChannel::InitNetwork_n, this,
+                              rtp_dtls_transport, rtcp_dtls_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(TransportChannel* rtp_transport,
-                                TransportChannel* rtcp_transport) {
+bool BaseChannel::InitNetwork_n(DtlsTransportInternal* rtp_dtls_transport,
+                                DtlsTransportInternal* rtcp_dtls_transport) {
   RTC_DCHECK(network_thread_->IsCurrent());
-  SetTransports_n(rtp_transport, rtcp_transport);
+  SetTransports_n(rtp_dtls_transport, rtcp_dtls_transport);
 
-  if (!SetDtlsSrtpCryptoSuites_n(rtp_transport_, false)) {
+  if (!SetDtlsSrtpCryptoSuites_n(rtp_dtls_transport_, false)) {
     return false;
   }
-  if (rtcp_transport_ && !SetDtlsSrtpCryptoSuites_n(rtcp_transport_, true)) {
+  if (rtcp_dtls_transport_ &&
+      !SetDtlsSrtpCryptoSuites_n(rtcp_dtls_transport_, true)) {
     return false;
   }
   if (rtcp_mux_required_) {
     rtcp_mux_filter_.SetActive();
   }
   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));
 }
 
-void BaseChannel::SetTransports(TransportChannel* rtp_transport,
-                                TransportChannel* rtcp_transport) {
-  network_thread_->Invoke<void>(
-      RTC_FROM_HERE,
-      Bind(&BaseChannel::SetTransports_n, this, rtp_transport, rtcp_transport));
+void BaseChannel::SetTransports(DtlsTransportInternal* rtp_dtls_transport,
+                                DtlsTransportInternal* rtcp_dtls_transport) {
+  network_thread_->Invoke<void>(RTC_FROM_HERE,
+                                Bind(&BaseChannel::SetTransports_n, this,
+                                     rtp_dtls_transport, rtcp_dtls_transport));
 }
 
-void BaseChannel::SetTransports_n(TransportChannel* rtp_transport,
-                                  TransportChannel* rtcp_transport) {
+void BaseChannel::SetTransports_n(DtlsTransportInternal* rtp_dtls_transport,
+                                  DtlsTransportInternal* rtcp_dtls_transport) {
   RTC_DCHECK(network_thread_->IsCurrent());
-  // Verify some assumptions (as described in the comment above SetTransport).
-  RTC_DCHECK(rtp_transport);
-  RTC_DCHECK(NeedsRtcpTransport() == (rtcp_transport != nullptr));
-  if (rtcp_transport) {
-    RTC_DCHECK(rtp_transport->transport_name() ==
-               rtcp_transport->transport_name());
+  if (!rtp_dtls_transport && !rtcp_dtls_transport) {
+    LOG(LS_ERROR) << "Setting nullptr to RTP Transport and RTCP Transport.";
+    return;
   }
 
-  if (rtp_transport->transport_name() == transport_name_) {
+  if (rtp_dtls_transport && rtcp_dtls_transport) {
+    RTC_DCHECK(rtp_dtls_transport->transport_name() ==
+               rtcp_dtls_transport->transport_name());
+    RTC_DCHECK(NeedsRtcpTransport());
+  }
+
+  std::string transport_name = rtp_dtls_transport
+                                   ? rtp_dtls_transport->transport_name()
+                                   : rtcp_dtls_transport->transport_name();
+  if (transport_name == transport_name_) {
     // Nothing to do if transport name isn't changing.
     return;
   }
 
-  transport_name_ = rtp_transport->transport_name();
+  transport_name_ = transport_name;
 
   // 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 doesn't require RTCP mux and we haven't fully
   // negotiated RTCP mux, we need an RTCP transport.
   if (NeedsRtcpTransport()) {
     LOG(LS_INFO) << "Setting RTCP Transport for " << content_name() << " on "
-                 << transport_name() << " transport " << rtcp_transport;
-    SetTransportChannel_n(true, rtcp_transport);
-    RTC_DCHECK(rtcp_transport_);
+                 << transport_name << " transport " << rtcp_dtls_transport;
+    SetTransport_n(true, rtcp_dtls_transport);
+    RTC_DCHECK(rtcp_dtls_transport_);
   }
 
   LOG(LS_INFO) << "Setting non-RTCP Transport for " << content_name() << " on "
-               << transport_name() << " transport " << rtp_transport;
-  SetTransportChannel_n(false, rtp_transport);
-  RTC_DCHECK(rtp_transport_);
+               << transport_name << " transport " << rtp_dtls_transport;
+  SetTransport_n(false, rtp_dtls_transport);
+  RTC_DCHECK(rtp_dtls_transport_);
 
   // 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(
-      true, rtcp_transport_ && rtcp_transport_->writable());
+      false, rtp_dtls_transport_ && rtp_dtls_transport_->writable());
+  SetTransportChannelReadyToSend(
+      true, rtcp_dtls_transport_ && rtcp_dtls_transport_->writable());
 }
 
-void BaseChannel::SetTransportChannel_n(bool rtcp,
-                                        TransportChannel* new_transport) {
+void BaseChannel::SetTransport_n(bool rtcp,
+                                 DtlsTransportInternal* new_transport) {
   RTC_DCHECK(network_thread_->IsCurrent());
-  TransportChannel*& old_transport = rtcp ? rtcp_transport_ : rtp_transport_;
+  DtlsTransportInternal*& old_transport =
+      rtcp ? rtcp_dtls_transport_ : rtp_dtls_transport_;
+
   if (!old_transport && !new_transport) {
     // Nothing to do.
     return;
   }
+
   RTC_DCHECK(old_transport != new_transport);
   if (old_transport) {
-    DisconnectFromTransportChannel(old_transport);
+    DisconnectFromTransport(old_transport);
   }
 
   old_transport = new_transport;
 
   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_transport);
+    ConnectToTransport(new_transport);
     auto& socket_options = rtcp ? rtcp_socket_options_ : socket_options_;
     for (const auto& pair : socket_options) {
       new_transport->SetOption(pair.first, pair.second);
     }
   }
 }
 
-void BaseChannel::ConnectToTransportChannel(TransportChannel* tc) {
+void BaseChannel::ConnectToTransport(DtlsTransportInternal* transport) {
   RTC_DCHECK(network_thread_->IsCurrent());
 
-  tc->SignalWritableState.connect(this, &BaseChannel::OnWritableState);
-  tc->SignalReadPacket.connect(this, &BaseChannel::OnPacketRead);
-  tc->SignalReadyToSend.connect(this, &BaseChannel::OnReadyToSend);
-  tc->SignalDtlsState.connect(this, &BaseChannel::OnDtlsState);
-  tc->SignalSelectedCandidatePairChanged.connect(
+  transport->SignalWritableState.connect(this, &BaseChannel::OnWritableState);
+  transport->SignalReadPacket.connect(this, &BaseChannel::OnPacketRead);
+  transport->SignalReadyToSend.connect(this, &BaseChannel::OnReadyToSend);
+  transport->SignalDtlsState.connect(this, &BaseChannel::OnDtlsState);
+  transport->SignalSentPacket.connect(this, &BaseChannel::SignalSentPacket_n);
+  transport->ice_transport()->SignalSelectedCandidatePairChanged.connect(
       this, &BaseChannel::OnSelectedCandidatePairChanged);
-  tc->SignalSentPacket.connect(this, &BaseChannel::SignalSentPacket_n);
 }
 
-void BaseChannel::DisconnectFromTransportChannel(TransportChannel* tc) {
+void BaseChannel::DisconnectFromTransport(DtlsTransportInternal* transport) {
   RTC_DCHECK(network_thread_->IsCurrent());
-  OnSelectedCandidatePairChanged(tc, nullptr, -1, false);
+  OnSelectedCandidatePairChanged(transport->ice_transport(), nullptr, -1,
+                                 false);
 
-  tc->SignalWritableState.disconnect(this);
-  tc->SignalReadPacket.disconnect(this);
-  tc->SignalReadyToSend.disconnect(this);
-  tc->SignalDtlsState.disconnect(this);
-  tc->SignalSelectedCandidatePairChanged.disconnect(this);
-  tc->SignalSentPacket.disconnect(this);
+  transport->SignalWritableState.disconnect(this);
+  transport->SignalReadPacket.disconnect(this);
+  transport->SignalReadyToSend.disconnect(this);
+  transport->SignalDtlsState.disconnect(this);
+  transport->SignalSentPacket.disconnect(this);
+  transport->ice_transport()->SignalSelectedCandidatePairChanged.disconnect(
+      this);
 }
 
 bool BaseChannel::Enable(bool enable) {
   worker_thread_->Invoke<void>(
       RTC_FROM_HERE,
       Bind(enable ? &BaseChannel::EnableMedia_w : &BaseChannel::DisableMedia_w,
            this));
   return true;
 }
 
@@ skipping 27 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 rtp_transport_
-  // because if the rtp_transport_ changes, the ConnectionMonitor
+  // We pass in the BaseChannel instead of the rtp_dtls_transport_
+  // because if the rtp_dtls_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 rtp_transport_->GetStats(infos);
+  return rtp_dtls_transport_->ice_transport()->GetStats(infos);
 }
 
 bool BaseChannel::NeedsRtcpTransport() {
   // If this BaseChannel doesn't require RTCP mux and we haven't fully
   // negotiated RTCP mux, we need an RTCP transport.
   return !rtcp_mux_required_ && !rtcp_mux_filter_.IsFullyActive();
 }
 
 bool BaseChannel::IsReadyToReceiveMedia_w() const {
   // Receive data if we are enabled and have local content,
@@ skipping 28 matching lines @@
 int BaseChannel::SetOption(SocketType type, rtc::Socket::Option opt,
                            int value) {
   return network_thread_->Invoke<int>(
       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;
+  DtlsTransportInternal* transport = nullptr;
   switch (type) {
     case ST_RTP:
-      channel = rtp_transport_;
+      transport = rtp_dtls_transport_;
       socket_options_.push_back(
           std::pair<rtc::Socket::Option, int>(opt, value));
       break;
     case ST_RTCP:
-      channel = rtcp_transport_;
+      transport = rtcp_dtls_transport_;
       rtcp_socket_options_.push_back(
           std::pair<rtc::Socket::Option, int>(opt, value));
       break;
   }
-  return channel ? channel->SetOption(opt, value) : -1;
+  return transport ? transport->ice_transport()->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 == rtp_transport_ || transport == rtcp_transport_);
+  RTC_DCHECK(transport == rtp_dtls_transport_ ||
+             transport == rtcp_dtls_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 == rtp_transport_ || transport == rtcp_transport_);
-  SetTransportChannelReadyToSend(transport == rtcp_transport_, true);
+  RTC_DCHECK(transport == rtp_dtls_transport_ ||
+             transport == rtcp_dtls_transport_);
+  SetTransportChannelReadyToSend(transport == rtcp_dtls_transport_, true);
 }
 
-void BaseChannel::OnDtlsState(TransportChannel* channel,
+void BaseChannel::OnDtlsState(DtlsTransportInternal* transport,
                               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
+  // cover other scenarios like the whole transport 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,
+    IceTransportInternal* ice_transport,
     CandidatePairInterface* selected_candidate_pair,
     int last_sent_packet_id,
     bool ready_to_send) {
-  RTC_DCHECK(channel == rtp_transport_ || channel == rtcp_transport_);
+  RTC_DCHECK(ice_transport == rtp_dtls_transport_->ice_transport() ||
+             ice_transport == rtcp_dtls_transport_->ice_transport());
   RTC_DCHECK(network_thread_->IsCurrent());
   selected_candidate_pair_ = selected_candidate_pair;
-  std::string transport_name = channel->transport_name();
+  std::string transport_name = ice_transport->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_| will be null.
-       (rtcp_ready_to_send_ || !rtcp_transport_));
+       // In the case of rtcp mux |rtcp_dtls_transport_| will be null.
+       (rtcp_ready_to_send_ || !rtcp_dtls_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_ ||
+  return (transport == rtcp_dtls_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()) ? rtp_transport_ : rtcp_transport_;
-  if (!channel || !channel->writable()) {
+  DtlsTransportInternal* transport = (!rtcp || rtcp_mux_filter_.IsActive())
+                                         ? rtp_dtls_transport_
+                                         : rtcp_dtls_transport_;
+  if (!transport || !transport->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 70 matching lines @@
     // However, there shouldn't be any RTP packets sent before SRTP is set up
     // (and SetSend(true) is called).
     LOG(LS_ERROR) << "Can't send outgoing RTP packet when SRTP is inactive"
                   << " and crypto is required";
     RTC_NOTREACHED();
     return false;
   }
 
   // Bon voyage.
   int flags = (secure() && secure_dtls()) ? PF_SRTP_BYPASS : PF_NORMAL;
-  int ret = channel->SendPacket(packet->data<char>(), packet->size(),
-                                updated_options, flags);
+  int ret = transport->SendPacket(packet->data<char>(), packet->size(),
+                                  updated_options, flags);
   if (ret != static_cast<int>(packet->size())) {
-    if (channel->GetError() == ENOTCONN) {
+    if (transport->GetError() == ENOTCONN) {
       LOG(LS_WARNING) << "Got ENOTCONN from transport.";
       SetTransportChannelReadyToSend(rtcp, false);
     }
     return false;
   }
   return true;
 }
 
 bool BaseChannel::WantsPacket(bool rtcp, const rtc::CopyOnWriteBuffer* packet) {
   // Protect ourselves against crazy data.
@@ skipping 54 matching lines @@
       }
     }
 
     packet->SetSize(len);
   } else if (srtp_required_) {
     // Our session description indicates that SRTP is required, but we got a
     // packet before our SRTP filter is active. This means either that
     // a) we got SRTP packets before we received the SDES keys, in which case
     //    we can't decrypt it anyway, or
     // b) we got SRTP packets before DTLS completed on both the RTP and RTCP
-    //    channels, so we haven't yet extracted keys, even if DTLS did complete
-    //    on the channel that the packets are being sent on. It's really good
-    //    practice to wait for both RTP and RTCP to be good to go before sending
-    //    media, to prevent weird failure modes, so it's fine for us to just eat
-    //    packets here. This is all sidestepped if RTCP mux is used anyway.
+    //    transports, so we haven't yet extracted keys, even if DTLS did
+    //    complete on the transport that the packets are being sent on. It's
+    //    really good practice to wait for both RTP and RTCP to be good to go
+    //    before sending  media, to prevent weird failure modes, so it's fine
+    //    for us to just eat packets here. This is all sidestepped if RTCP mux
+    //    is used anyway.
     LOG(LS_WARNING) << "Can't process incoming " << PacketType(rtcp)
                     << " packet when SRTP is inactive and crypto is required";
     return;
   }
 
   invoker_.AsyncInvoke<void>(
       RTC_FROM_HERE, worker_thread_,
       Bind(&BaseChannel::OnPacketReceived, this, rtcp, *packet, packet_time));
 }
 
@@ skipping 53 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 (rtp_transport_ && rtp_transport_->writable() &&
-      (!rtcp_transport_ || rtcp_transport_->writable())) {
+  if (rtp_dtls_transport_ && rtp_dtls_transport_->writable() &&
+      (!rtcp_dtls_transport_ || rtcp_dtls_transport_->writable())) {
     ChannelWritable_n();
   } else {
     ChannelNotWritable_n();
   }
 }
 
 void BaseChannel::ChannelWritable_n() {
   RTC_DCHECK(network_thread_->IsCurrent());
   if (writable_) {
     return;
@@ skipping 20 matching lines @@
   invoker_.AsyncInvoke<void>(
       RTC_FROM_HERE, signaling_thread(),
       Bind(&BaseChannel::SignalDtlsSrtpSetupFailure_s, this, rtcp));
 }
 
 void BaseChannel::SignalDtlsSrtpSetupFailure_s(bool rtcp) {
   RTC_DCHECK(signaling_thread() == rtc::Thread::Current());
   SignalDtlsSrtpSetupFailure(this, rtcp);
 }
 
-bool BaseChannel::SetDtlsSrtpCryptoSuites_n(TransportChannel* tc, bool rtcp) {
+bool BaseChannel::SetDtlsSrtpCryptoSuites_n(DtlsTransportInternal* transport,
+                                            bool rtcp) {
   std::vector<int> crypto_suites;
   // We always use the default SRTP crypto suites for RTCP, but we may use
   // different crypto suites for RTP depending on the media type.
   if (!rtcp) {
     GetSrtpCryptoSuites_n(&crypto_suites);
   } else {
     GetDefaultSrtpCryptoSuites(crypto_options(), &crypto_suites);
   }
-  return tc->SetSrtpCryptoSuites(crypto_suites);
+  return transport->SetSrtpCryptoSuites(crypto_suites);
 }
 
 bool BaseChannel::ShouldSetupDtlsSrtp_n() const {
-  // Since DTLS is applied to all channels, checking RTP should be enough.
-  return rtp_transport_ && rtp_transport_->IsDtlsActive();
+  // Since DTLS is applied to all transports, checking RTP should be enough.
+  return rtp_dtls_transport_ && rtp_dtls_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) {
+bool BaseChannel::SetupDtlsSrtp_n(bool rtcp) {
   RTC_DCHECK(network_thread_->IsCurrent());
   bool ret = false;
 
-  TransportChannel* channel = rtcp_channel ? rtcp_transport_ : rtp_transport_;
+  DtlsTransportInternal* transport =
+      rtcp ? rtcp_dtls_transport_ : rtp_dtls_transport_;
 
-  RTC_DCHECK(channel->IsDtlsActive());
+  RTC_DCHECK(transport->IsDtlsActive());
 
   int selected_crypto_suite;
 
-  if (!channel->GetSrtpCryptoSuite(&selected_crypto_suite)) {
+  if (!transport->GetSrtpCryptoSuite(&selected_crypto_suite)) {
     LOG(LS_ERROR) << "No DTLS-SRTP selected crypto suite";
     return false;
   }
 
-  LOG(LS_INFO) << "Installing keys from DTLS-SRTP on "
-               << content_name() << " "
-               << PacketType(rtcp_channel);
+  LOG(LS_INFO) << "Installing keys from DTLS-SRTP on " << content_name() << " "
+               << PacketType(rtcp);
 
   int key_len;
   int salt_len;
   if (!rtc::GetSrtpKeyAndSaltLengths(selected_crypto_suite, &key_len,
       &salt_len)) {
     LOG(LS_ERROR) << "Unknown DTLS-SRTP crypto suite" << selected_crypto_suite;
     return false;
   }
 
   // OK, we're now doing DTLS (RFC 5764)
   std::vector<unsigned char> dtls_buffer(key_len * 2 + salt_len * 2);
 
   // RFC 5705 exporter using the RFC 5764 parameters
-  if (!channel->ExportKeyingMaterial(
-          kDtlsSrtpExporterLabel,
-          NULL, 0, false,
-          &dtls_buffer[0], dtls_buffer.size())) {
+  if (!transport->ExportKeyingMaterial(kDtlsSrtpExporterLabel, NULL, 0, false,
+                                       &dtls_buffer[0], dtls_buffer.size())) {
     LOG(LS_WARNING) << "DTLS-SRTP key export failed";
     RTC_NOTREACHED();  // This should never happen
     return false;
   }
 
   // Sync up the keys with the DTLS-SRTP interface
   std::vector<unsigned char> client_write_key(key_len + salt_len);
   std::vector<unsigned char> server_write_key(key_len + salt_len);
   size_t offset = 0;
   memcpy(&client_write_key[0], &dtls_buffer[offset], key_len);
   offset += key_len;
   memcpy(&server_write_key[0], &dtls_buffer[offset], key_len);
   offset += key_len;
   memcpy(&client_write_key[key_len], &dtls_buffer[offset], salt_len);
   offset += salt_len;
   memcpy(&server_write_key[key_len], &dtls_buffer[offset], salt_len);
 
   std::vector<unsigned char> *send_key, *recv_key;
   rtc::SSLRole role;
-  if (!channel->GetSslRole(&role)) {
+  if (!transport->GetSslRole(&role)) {
     LOG(LS_WARNING) << "GetSslRole failed";
     return false;
   }
 
   if (role == rtc::SSL_SERVER) {
     send_key = &server_write_key;
     recv_key = &client_write_key;
   } else {
     send_key = &client_write_key;
     recv_key = &server_write_key;
   }
 
-  if (rtcp_channel) {
+  if (rtcp) {
     ret = srtp_filter_.SetRtcpParams(selected_crypto_suite, &(*send_key)[0],
                                      static_cast<int>(send_key->size()),
                                      selected_crypto_suite, &(*recv_key)[0],
                                      static_cast<int>(recv_key->size()));
   } else {
     ret = srtp_filter_.SetRtpParams(selected_crypto_suite, &(*send_key)[0],
                                     static_cast<int>(send_key->size()),
                                     selected_crypto_suite, &(*recv_key)[0],
                                     static_cast<int>(recv_key->size()));
   }
@@ skipping 14 matching lines @@
 
   if (!ShouldSetupDtlsSrtp_n()) {
     return;
   }
 
   if (!SetupDtlsSrtp_n(false)) {
     SignalDtlsSrtpSetupFailure_n(false);
     return;
   }
 
-  if (rtcp_transport_) {
+  if (rtcp_dtls_transport_) {
     if (!SetupDtlsSrtp_n(true)) {
       SignalDtlsSrtpSetupFailure_n(true);
       return;
     }
   }
 }
 
 void BaseChannel::ChannelNotWritable_n() {
   RTC_DCHECK(network_thread_->IsCurrent());
   if (!writable_)
@@ skipping 31 matching lines @@
     return false;
   }
 
   if (!SetRtcpMux_n(content->rtcp_mux(), action, src, error_desc)) {
     return false;
   }
 
   return true;
 }
 
-// |dtls| will be set to true if DTLS is active for transport channel and
-// crypto is empty.
+// |dtls| will be set to true if DTLS is active for transport and crypto is
+// empty.
 bool BaseChannel::CheckSrtpConfig_n(const std::vector<CryptoParams>& cryptos,
                                     bool* dtls,
                                     std::string* error_desc) {
-  *dtls = rtp_transport_->IsDtlsActive();
+  *dtls = rtp_dtls_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 53 matching lines @@
         "contain 'a=rtcp-mux'.",
         error_desc);
     return false;
   }
   bool ret = false;
   switch (action) {
     case CA_OFFER:
       ret = rtcp_mux_filter_.SetOffer(enable, src);
       break;
     case CA_PRANSWER:
-      // This may activate RTCP muxing, but we don't yet destroy the channel
+      // This may activate RTCP muxing, but we don't yet destroy the transport
       // because the final answer may deactivate it.
       ret = rtcp_mux_filter_.SetProvisionalAnswer(enable, src);
       break;
     case CA_ANSWER:
       ret = rtcp_mux_filter_.SetAnswer(enable, src);
       if (ret && rtcp_mux_filter_.IsActive()) {
         // We activated RTCP mux, close down the RTCP transport.
         LOG(LS_INFO) << "Enabling rtcp-mux for " << content_name()
-                     << " by destroying RTCP transport channel for "
+                     << " by destroying RTCP transport for "
                      << transport_name();
-        if (rtcp_transport()) {
-          SetTransportChannel_n(true, nullptr);
-          SignalRtcpMuxFullyActive(rtp_transport()->transport_name());
+        if (rtcp_dtls_transport()) {
+          SetTransport_n(true, nullptr);
+          SignalRtcpMuxFullyActive(rtp_dtls_transport()->transport_name());
         }
         UpdateWritableState_n();
         SetTransportChannelReadyToSend(true, false);
       }
       break;
     case CA_UPDATE:
       // No RTCP mux info.
       ret = true;
       break;
     default:
       break;
   }
   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.
+  // CA_ANSWER, but we only want to tear down the RTCP transport if we received
+  // a final answer.
   if (rtcp_mux_filter_.IsActive()) {
     // If the RTP transport is already writable, then so are we.
-    if (rtp_transport_->writable()) {
+    if (rtp_dtls_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 239 matching lines @@
 
 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(TransportChannel* rtp_transport,
-                          TransportChannel* rtcp_transport) {
-  return BaseChannel::Init_w(rtp_transport, rtcp_transport);
+bool VoiceChannel::Init_w(DtlsTransportInternal* rtp_dtls_transport,
+                          DtlsTransportInternal* rtcp_dtls_transport) {
+  return BaseChannel::Init_w(rtp_dtls_transport, rtcp_dtls_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 379 matching lines @@
                            bool rtcp_mux_required,
                            bool srtp_required)
     : BaseChannel(worker_thread,
                   network_thread,
                   signaling_thread,
                   media_channel,
                   content_name,
                   rtcp_mux_required,
                   srtp_required) {}
 
-bool VideoChannel::Init_w(TransportChannel* rtp_transport,
-                          TransportChannel* rtcp_transport) {
-  return BaseChannel::Init_w(rtp_transport, rtcp_transport);
+bool VideoChannel::Init_w(DtlsTransportInternal* rtp_dtls_transport,
+                          DtlsTransportInternal* rtcp_dtls_transport) {
+  return BaseChannel::Init_w(rtp_dtls_transport, rtcp_dtls_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 247 matching lines @@
 
 RtpDataChannel::~RtpDataChannel() {
   TRACE_EVENT0("webrtc", "RtpDataChannel::~RtpDataChannel");
   StopMediaMonitor();
   // this can't be done in the base class, since it calls a virtual
   DisableMedia_w();
 
   Deinit();
 }
 
-bool RtpDataChannel::Init_w(TransportChannel* rtp_transport,
-                            TransportChannel* rtcp_transport) {
-  if (!BaseChannel::Init_w(rtp_transport, rtcp_transport)) {
+bool RtpDataChannel::Init_w(DtlsTransportInternal* rtp_dtls_transport,
+                            DtlsTransportInternal* rtcp_dtls_transport) {
+  if (!BaseChannel::Init_w(rtp_dtls_transport, rtcp_dtls_transport)) {
     return false;
   }
   media_channel()->SignalDataReceived.connect(this,
                                               &RtpDataChannel::OnDataReceived);
   media_channel()->SignalReadyToSend.connect(
       this, &RtpDataChannel::OnDataChannelReadyToSend);
   return true;
 }
 
 bool RtpDataChannel::SendData(const SendDataParams& params,
@@ skipping 225 matching lines @@
   signaling_thread()->Post(RTC_FROM_HERE, this, MSG_READYTOSENDDATA,
                            new DataChannelReadyToSendMessageData(writable));
 }
 
 void RtpDataChannel::GetSrtpCryptoSuites_n(
     std::vector<int>* crypto_suites) const {
   GetSupportedDataCryptoSuites(crypto_options(), crypto_suites);
 }
 
 }  // namespace cricket