Adding ability for BaseChannel to use PacketTransportInterface.

webrtc/pc/channel_unittest.cc

 /*
  *  Copyright 2009 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 <memory>
 
 #include "webrtc/base/array_view.h"
 #include "webrtc/base/buffer.h"
 #include "webrtc/base/checks.h"
 #include "webrtc/base/fakeclock.h"
 #include "webrtc/base/gunit.h"
 #include "webrtc/base/logging.h"
 #include "webrtc/base/sslstreamadapter.h"
 #include "webrtc/media/base/fakemediaengine.h"
 #include "webrtc/media/base/fakertp.h"
 #include "webrtc/media/base/mediachannel.h"
 #include "webrtc/media/base/testutils.h"
-#include "webrtc/p2p/base/dtlstransportinternal.h"
-#include "webrtc/p2p/base/faketransportcontroller.h"
+#include "webrtc/p2p/base/fakecandidatepair.h"
+#include "webrtc/p2p/base/fakedtlstransport.h"
+#include "webrtc/p2p/base/fakepackettransport.h"
 #include "webrtc/pc/channel.h"
 
 #define MAYBE_SKIP_TEST(feature)                    \
   if (!(rtc::SSLStreamAdapter::feature())) {  \
     LOG(LS_INFO) << "Feature disabled... skipping"; \
     return;                                         \
   }
 
 using cricket::CA_OFFER;
 using cricket::CA_PRANSWER;
@@ skipping 59 matching lines @@
 // Base class for Voice/Video/RtpDataChannel tests
 template<class T>
 class ChannelTest : public testing::Test, public sigslot::has_slots<> {
  public:
   enum Flags {
     RTCP_MUX = 0x1,
     RTCP_MUX_REQUIRED = 0x2,
     SECURE = 0x4,
     SSRC_MUX = 0x8,
     DTLS = 0x10,
-    GCM_CIPHER = 0x20
+    GCM_CIPHER = 0x20,
+    // Use BaseChannel with PacketTransportInterface rather than
+    // DtlsTransportInternal.
+    RAW_PACKET_TRANSPORT = 0x40,
   };
 
   ChannelTest(bool verify_playout,
               rtc::ArrayView<const uint8_t> rtp_data,
               rtc::ArrayView<const uint8_t> rtcp_data,
               NetworkIsWorker network_is_worker)
       : verify_playout_(verify_playout),
-        media_channel1_(NULL),
-        media_channel2_(NULL),
         rtp_packet_(rtp_data.data(), rtp_data.size()),
-        rtcp_packet_(rtcp_data.data(), rtcp_data.size()),
-        media_info_callbacks1_(),
-        media_info_callbacks2_() {
+        rtcp_packet_(rtcp_data.data(), rtcp_data.size()) {
     if (network_is_worker == NetworkIsWorker::Yes) {
       network_thread_ = rtc::Thread::Current();
     } else {
       network_thread_keeper_ = rtc::Thread::Create();
       network_thread_keeper_->SetName("Network", nullptr);
       network_thread_keeper_->Start();
       network_thread_ = network_thread_keeper_.get();
     }
-    transport_controller1_.reset(new cricket::FakeTransportController(
-        network_thread_, cricket::ICEROLE_CONTROLLING));
-    transport_controller2_.reset(new cricket::FakeTransportController(
-        network_thread_, cricket::ICEROLE_CONTROLLED));
   }
 
   void CreateChannels(int flags1, int flags2) {
     CreateChannels(new typename T::MediaChannel(NULL, typename T::Options()),
                    new typename T::MediaChannel(NULL, typename T::Options()),
                    flags1, flags2);
   }
   void CreateChannels(typename T::MediaChannel* ch1,
                       typename T::MediaChannel* ch2,
                       int flags1,
                       int flags2) {
     // Make sure RTCP_MUX_REQUIRED isn't set without RTCP_MUX.
-    ASSERT_NE(RTCP_MUX_REQUIRED, flags1 & (RTCP_MUX | RTCP_MUX_REQUIRED));
-    ASSERT_NE(RTCP_MUX_REQUIRED, flags2 & (RTCP_MUX | RTCP_MUX_REQUIRED));
+    RTC_DCHECK_NE(RTCP_MUX_REQUIRED, flags1 & (RTCP_MUX | RTCP_MUX_REQUIRED));
+    RTC_DCHECK_NE(RTCP_MUX_REQUIRED, flags2 & (RTCP_MUX | RTCP_MUX_REQUIRED));
+    // Make sure if using raw packet transports, they're used for both
+    // channels.
+    RTC_DCHECK_EQ(flags1 & RAW_PACKET_TRANSPORT, flags2 & RAW_PACKET_TRANSPORT);
     rtc::Thread* worker_thread = rtc::Thread::Current();
     media_channel1_ = ch1;
     media_channel2_ = ch2;
+    rtc::PacketTransportInterface* rtp1 = nullptr;
+    rtc::PacketTransportInterface* rtcp1 = nullptr;
+    rtc::PacketTransportInterface* rtp2 = nullptr;
+    rtc::PacketTransportInterface* rtcp2 = nullptr;
+    // Based on flags, create fake DTLS or raw packet transports.
+    if (flags1 & RAW_PACKET_TRANSPORT) {
+      fake_rtp_packet_transport1_.reset(
+          new rtc::FakePacketTransport("channel1_rtp"));
+      rtp1 = fake_rtp_packet_transport1_.get();
+      if (!(flags1 & RTCP_MUX_REQUIRED)) {
+        fake_rtcp_packet_transport1_.reset(
+            new rtc::FakePacketTransport("channel1_rtcp"));
+        rtcp1 = fake_rtcp_dtls_transport1_.get();
+      }
+    } else {
+      // Confirmed to work with KT_RSA and KT_ECDSA.
+      fake_rtp_dtls_transport1_.reset(new cricket::FakeDtlsTransport(
+          "channel1", cricket::ICE_CANDIDATE_COMPONENT_RTP));
+      rtp1 = fake_rtp_dtls_transport1_.get();
+      if (!(flags1 & RTCP_MUX_REQUIRED)) {
+        fake_rtcp_dtls_transport1_.reset(new cricket::FakeDtlsTransport(
+            "channel1", cricket::ICE_CANDIDATE_COMPONENT_RTCP));
+        rtcp1 = fake_rtcp_dtls_transport1_.get();
+      }
+      if (flags1 & DTLS) {
+        auto cert1 =
+            rtc::RTCCertificate::Create(std::unique_ptr<rtc::SSLIdentity>(
+                rtc::SSLIdentity::Generate("session1", rtc::KT_DEFAULT)));
+        fake_rtp_dtls_transport1_->SetLocalCertificate(cert1);
+        if (fake_rtcp_dtls_transport1_) {
+          fake_rtcp_dtls_transport1_->SetLocalCertificate(cert1);
+        }
+      }
+    }
+    // Based on flags, create fake DTLS or raw packet transports.
+    if (flags2 & RAW_PACKET_TRANSPORT) {
+      fake_rtp_packet_transport2_.reset(
+          new rtc::FakePacketTransport("channel2_rtp"));
+      rtp2 = fake_rtp_packet_transport2_.get();
+      if (!(flags2 & RTCP_MUX_REQUIRED)) {
+        fake_rtcp_packet_transport2_.reset(
+            new rtc::FakePacketTransport("channel2_rtcp"));
+        rtcp2 = fake_rtcp_dtls_transport2_.get();
+      }
+    } else {
+      // Confirmed to work with KT_RSA and KT_ECDSA.
+      fake_rtp_dtls_transport2_.reset(new cricket::FakeDtlsTransport(
+          "channel2", cricket::ICE_CANDIDATE_COMPONENT_RTP));
+      rtp2 = fake_rtp_dtls_transport2_.get();
+      if (!(flags2 & RTCP_MUX_REQUIRED)) {
+        fake_rtcp_dtls_transport2_.reset(new cricket::FakeDtlsTransport(
+            "channel2", cricket::ICE_CANDIDATE_COMPONENT_RTCP));
+        rtcp2 = fake_rtcp_dtls_transport2_.get();
+      }
+      if (flags2 & DTLS) {
+        auto cert2 =
+            rtc::RTCCertificate::Create(std::unique_ptr<rtc::SSLIdentity>(
+                rtc::SSLIdentity::Generate("session2", rtc::KT_DEFAULT)));
+        fake_rtp_dtls_transport2_->SetLocalCertificate(cert2);
+        if (fake_rtcp_dtls_transport2_) {
+          fake_rtcp_dtls_transport2_->SetLocalCertificate(cert2);
+        }
+      }
+    }
     channel1_.reset(
         CreateChannel(worker_thread, network_thread_, &media_engine_, ch1,
-                      transport_controller1_.get(), flags1));
+                      fake_rtp_dtls_transport1_.get(),
+                      fake_rtcp_dtls_transport1_.get(), rtp1, rtcp1, flags1));
     channel2_.reset(
         CreateChannel(worker_thread, network_thread_, &media_engine_, ch2,
-                      transport_controller2_.get(), flags2));
+                      fake_rtp_dtls_transport2_.get(),
+                      fake_rtcp_dtls_transport2_.get(), rtp2, rtcp2, flags2));
     channel1_->SignalMediaMonitor.connect(this,
                                           &ChannelTest<T>::OnMediaMonitor1);
     channel2_->SignalMediaMonitor.connect(this,
                                           &ChannelTest<T>::OnMediaMonitor2);
     channel1_->SignalRtcpMuxFullyActive.connect(
-        transport_controller1_.get(),
-        &cricket::FakeTransportController::DestroyRtcpTransport);
+        this, &ChannelTest<T>::OnRtcpMuxFullyActive1);
     channel2_->SignalRtcpMuxFullyActive.connect(
-        transport_controller2_.get(),
-        &cricket::FakeTransportController::DestroyRtcpTransport);
+        this, &ChannelTest<T>::OnRtcpMuxFullyActive2);
     if ((flags1 & DTLS) && (flags2 & DTLS)) {
       flags1 = (flags1 & ~SECURE);
       flags2 = (flags2 & ~SECURE);
     }
     CreateContent(flags1, kPcmuCodec, kH264Codec,
                   &local_media_content1_);
     CreateContent(flags2, kPcmuCodec, kH264Codec,
                   &local_media_content2_);
     CopyContent(local_media_content1_, &remote_media_content1_);
     CopyContent(local_media_content2_, &remote_media_content2_);
 
-    if (flags1 & DTLS) {
-      // Confirmed to work with KT_RSA and KT_ECDSA.
-      transport_controller1_->SetLocalCertificate(
-          rtc::RTCCertificate::Create(std::unique_ptr<rtc::SSLIdentity>(
-              rtc::SSLIdentity::Generate("session1", rtc::KT_DEFAULT))));
-    }
-    if (flags2 & DTLS) {
-      // Confirmed to work with KT_RSA and KT_ECDSA.
-      transport_controller2_->SetLocalCertificate(
-          rtc::RTCCertificate::Create(std::unique_ptr<rtc::SSLIdentity>(
-              rtc::SSLIdentity::Generate("session2", rtc::KT_DEFAULT))));
-    }
-
     // Add stream information (SSRC) to the local content but not to the remote
     // content. This means that we per default know the SSRC of what we send but
     // not what we receive.
     AddLegacyStreamInContent(kSsrc1, flags1, &local_media_content1_);
     AddLegacyStreamInContent(kSsrc2, flags2, &local_media_content2_);
 
     // If SSRC_MUX is used we also need to know the SSRC of the incoming stream.
     if (flags1 & SSRC_MUX) {
       AddLegacyStreamInContent(kSsrc1, flags1, &remote_media_content1_);
     }
     if (flags2 & SSRC_MUX) {
       AddLegacyStreamInContent(kSsrc2, flags2, &remote_media_content2_);
     }
   }
   typename T::Channel* CreateChannel(
       rtc::Thread* worker_thread,
       rtc::Thread* network_thread,
       cricket::MediaEngineInterface* engine,
       typename T::MediaChannel* ch,
-      cricket::TransportController* transport_controller,
+      cricket::DtlsTransportInternal* fake_rtp_dtls_transport,
+      cricket::DtlsTransportInternal* fake_rtcp_dtls_transport,
+      rtc::PacketTransportInterface* fake_rtp_packet_transport,
+      rtc::PacketTransportInterface* fake_rtcp_packet_transport,
       int flags) {
-    rtc::Thread* signaling_thread =
-        transport_controller ? transport_controller->signaling_thread()
-                             : nullptr;
+    rtc::Thread* signaling_thread = rtc::Thread::Current();
     typename T::Channel* channel = new typename T::Channel(
         worker_thread, network_thread, signaling_thread, engine, ch,
         cricket::CN_AUDIO, (flags & RTCP_MUX_REQUIRED) != 0,
         (flags & SECURE) != 0);
     rtc::CryptoOptions crypto_options;
     crypto_options.enable_gcm_crypto_suites = (flags & GCM_CIPHER) != 0;
     channel->SetCryptoOptions(crypto_options);
-    cricket::DtlsTransportInternal* rtp_dtls_transport =
-        transport_controller->CreateDtlsTransport(
-            channel->content_name(), cricket::ICE_CANDIDATE_COMPONENT_RTP);
-    cricket::DtlsTransportInternal* rtcp_dtls_transport = nullptr;
-    if (channel->NeedsRtcpTransport()) {
-      rtcp_dtls_transport = transport_controller->CreateDtlsTransport(
-          channel->content_name(), cricket::ICE_CANDIDATE_COMPONENT_RTCP);
+    if (!channel->NeedsRtcpTransport()) {
+      fake_rtcp_dtls_transport = nullptr;
     }
-    if (!channel->Init_w(rtp_dtls_transport, rtcp_dtls_transport)) {
+    if (!channel->Init_w(fake_rtp_dtls_transport, fake_rtcp_dtls_transport,
+                         fake_rtp_packet_transport,
+                         fake_rtcp_packet_transport)) {
       delete channel;
       channel = NULL;
     }
     return channel;
   }
 
+  void ConnectFakeTransports() {
+    network_thread_->Invoke<void>(RTC_FROM_HERE, [this] {
+      bool asymmetric = false;
+      // Depending on test flags, could be using DTLS or raw packet transport.
+      if (fake_rtp_dtls_transport1_ && fake_rtp_dtls_transport2_) {
+        fake_rtp_dtls_transport1_->SetDestination(
+            fake_rtp_dtls_transport2_.get(), asymmetric);
+      }
+      if (fake_rtcp_dtls_transport1_ && fake_rtcp_dtls_transport2_) {
+        fake_rtcp_dtls_transport1_->SetDestination(
+            fake_rtcp_dtls_transport2_.get(), asymmetric);
+      }
+      if (fake_rtp_packet_transport1_ && fake_rtp_packet_transport2_) {
+        fake_rtp_packet_transport1_->SetDestination(
+            fake_rtp_packet_transport2_.get(), asymmetric);
+      }
+      if (fake_rtcp_packet_transport1_ && fake_rtcp_packet_transport2_) {
+        fake_rtcp_packet_transport1_->SetDestination(
+            fake_rtcp_packet_transport2_.get(), asymmetric);
+      }
+    });
+  }
+
   bool SendInitiate() {
     bool result = channel1_->SetLocalContent(&local_media_content1_,
                                              CA_OFFER, NULL);
     if (result) {
       channel1_->Enable(true);
       result = channel2_->SetRemoteContent(&remote_media_content1_,
                                            CA_OFFER, NULL);
       if (result) {
-        transport_controller1_->Connect(transport_controller2_.get());
-
+        ConnectFakeTransports();
         result = channel2_->SetLocalContent(&local_media_content2_,
                                             CA_ANSWER, NULL);
       }
     }
     return result;
   }
 
   bool SendAccept() {
     channel2_->Enable(true);
     return channel1_->SetRemoteContent(&remote_media_content2_,
@@ skipping 11 matching lines @@
     return result;
   }
 
   bool SendProvisionalAnswer() {
     bool result = channel2_->SetLocalContent(&local_media_content2_,
                                              CA_PRANSWER, NULL);
     if (result) {
       channel2_->Enable(true);
       result = channel1_->SetRemoteContent(&remote_media_content2_,
                                            CA_PRANSWER, NULL);
-      transport_controller1_->Connect(transport_controller2_.get());
+      ConnectFakeTransports();
     }
     return result;
   }
 
   bool SendFinalAnswer() {
     bool result = channel2_->SetLocalContent(&local_media_content2_,
                                              CA_ANSWER, NULL);
     if (result)
       result = channel1_->SetRemoteContent(&remote_media_content2_,
                                            CA_ANSWER, NULL);
     return result;
   }
 
   bool SendTerminate() {
     channel1_.reset();
     channel2_.reset();
     return true;
   }
 
   bool AddStream1(int id) {
     return channel1_->AddRecvStream(cricket::StreamParams::CreateLegacy(id));
   }
   bool RemoveStream1(int id) {
     return channel1_->RemoveRecvStream(id);
   }
 
-  std::vector<cricket::DtlsTransportInternal*> GetChannels1() {
-    return transport_controller1_->channels_for_testing();
-  }
-
-  std::vector<cricket::DtlsTransportInternal*> GetChannels2() {
-    return transport_controller2_->channels_for_testing();
-  }
-
-  cricket::FakeDtlsTransport* GetFakeChannel1(int component) {
-    return transport_controller1_->GetFakeDtlsTransport_n(
-        channel1_->content_name(), component);
-  }
-
-  cricket::FakeDtlsTransport* GetFakeChannel2(int component) {
-    return transport_controller2_->GetFakeDtlsTransport_n(
-        channel2_->content_name(), component);
-  }
-
   void SendRtp1() {
     media_channel1_->SendRtp(rtp_packet_.data(), rtp_packet_.size(),
                              rtc::PacketOptions());
   }
   void SendRtp2() {
     media_channel2_->SendRtp(rtp_packet_.data(), rtp_packet_.size(),
                              rtc::PacketOptions());
   }
   void SendRtcp1() {
     media_channel1_->SendRtcp(rtcp_packet_.data(), rtcp_packet_.size());
@@ skipping 74 matching lines @@
   bool CheckNoRtcp1() {
     return media_channel1_->CheckNoRtcp();
   }
   bool CheckNoRtcp2() {
     return media_channel2_->CheckNoRtcp();
   }
   // Checks that the channel is using GCM iff GCM_CIPHER is set in flags.
   // Returns true if so.
   bool CheckGcmCipher(typename T::Channel* channel, int flags) {
     int suite;
-    if (!channel->rtp_dtls_transport()->GetSrtpCryptoSuite(&suite)) {
+    cricket::FakeDtlsTransport* transport =
+        (channel == channel1_.get()) ? fake_rtp_dtls_transport1_.get()
+                                     : fake_rtp_dtls_transport2_.get();
+    RTC_DCHECK(transport);
+    if (!transport->GetSrtpCryptoSuite(&suite)) {
       return false;
     }
 
     if (flags & GCM_CIPHER) {
       return rtc::IsGcmCryptoSuite(suite);
     } else {
       return (suite != rtc::SRTP_INVALID_CRYPTO_SUITE &&
           !rtc::IsGcmCryptoSuite(suite));
     }
   }
@@ skipping 50 matching lines @@
   void OnMediaMonitor1(typename T::Channel* channel,
                        const typename T::MediaInfo& info) {
     RTC_DCHECK_EQ(channel, channel1_.get());
     media_info_callbacks1_++;
   }
   void OnMediaMonitor2(typename T::Channel* channel,
                        const typename T::MediaInfo& info) {
     RTC_DCHECK_EQ(channel, channel2_.get());
     media_info_callbacks2_++;
   }
+  void OnRtcpMuxFullyActive1(const std::string&) {
+    rtcp_mux_activated_callbacks1_++;
+  }
+  void OnRtcpMuxFullyActive2(const std::string&) {
+    rtcp_mux_activated_callbacks2_++;
+  }
 
   cricket::CandidatePairInterface* last_selected_candidate_pair() {
     return last_selected_candidate_pair_;
   }
 
   void AddLegacyStreamInContent(uint32_t ssrc,
                                 int flags,
                                 typename T::Content* content) {
     // Base implementation.
   }
@@ skipping 39 matching lines @@
     EXPECT_TRUE(channel1_->SetRemoteContent(&content, CA_ANSWER, NULL));
     ASSERT_EQ(1U, media_channel1_->codecs().size());
     EXPECT_TRUE(CodecMatches(content.codecs()[0],
                              media_channel1_->codecs()[0]));
   }
 
   // Test that SetLocalContent and SetRemoteContent properly set RTCP
   // mux.
   void TestSetContentsRtcpMux() {
     CreateChannels(0, 0);
-    EXPECT_TRUE(channel1_->rtcp_dtls_transport() != NULL);
-    EXPECT_TRUE(channel2_->rtcp_dtls_transport() != NULL);
     typename T::Content content;
     CreateContent(0, kPcmuCodec, kH264Codec, &content);
     // Both sides agree on mux. Should no longer be a separate RTCP channel.
     content.set_rtcp_mux(true);
     EXPECT_TRUE(channel1_->SetLocalContent(&content, CA_OFFER, NULL));
     EXPECT_TRUE(channel1_->SetRemoteContent(&content, CA_ANSWER, NULL));
-    EXPECT_TRUE(channel1_->rtcp_dtls_transport() == NULL);
     // Only initiator supports mux. Should still have a separate RTCP channel.
     EXPECT_TRUE(channel2_->SetLocalContent(&content, CA_OFFER, NULL));
     content.set_rtcp_mux(false);
     EXPECT_TRUE(channel2_->SetRemoteContent(&content, CA_ANSWER, NULL));
-    EXPECT_TRUE(channel2_->rtcp_dtls_transport() != NULL);
   }
 
   // Test that SetLocalContent and SetRemoteContent properly set RTCP
   // mux when a provisional answer is received.
   void TestSetContentsRtcpMuxWithPrAnswer() {
     CreateChannels(0, 0);
-    EXPECT_TRUE(channel1_->rtcp_dtls_transport() != NULL);
-    EXPECT_TRUE(channel2_->rtcp_dtls_transport() != NULL);
     typename T::Content content;
     CreateContent(0, kPcmuCodec, kH264Codec, &content);
     content.set_rtcp_mux(true);
     EXPECT_TRUE(channel1_->SetLocalContent(&content, CA_OFFER, NULL));
     EXPECT_TRUE(channel1_->SetRemoteContent(&content, CA_PRANSWER, NULL));
-    EXPECT_TRUE(channel1_->rtcp_dtls_transport() != NULL);
+    // Both sides agree on mux. Should signal RTCP mux as fully activated.
+    EXPECT_EQ(0, rtcp_mux_activated_callbacks1_);
     EXPECT_TRUE(channel1_->SetRemoteContent(&content, CA_ANSWER, NULL));
-    // Both sides agree on mux. Should no longer be a separate RTCP channel.
-    EXPECT_TRUE(channel1_->rtcp_dtls_transport() == NULL);
+    EXPECT_EQ(1, rtcp_mux_activated_callbacks1_);
     // Only initiator supports mux. Should still have a separate RTCP channel.
     EXPECT_TRUE(channel2_->SetLocalContent(&content, CA_OFFER, NULL));
     content.set_rtcp_mux(false);
     EXPECT_TRUE(channel2_->SetRemoteContent(&content, CA_PRANSWER, NULL));
     EXPECT_TRUE(channel2_->SetRemoteContent(&content, CA_ANSWER, NULL));
-    EXPECT_TRUE(channel2_->rtcp_dtls_transport() != NULL);
+    EXPECT_EQ(0, rtcp_mux_activated_callbacks2_);
   }
 
   // Test that SetRemoteContent properly deals with a content update.
   void TestSetRemoteContentUpdate() {
     CreateChannels(0, 0);
     typename T::Content content;
     CreateContent(RTCP_MUX | SECURE, kPcmuCodec, kH264Codec, &content);
     EXPECT_EQ(0U, media_channel1_->codecs().size());
     EXPECT_TRUE(channel1_->SetLocalContent(&content, CA_OFFER, NULL));
     EXPECT_TRUE(channel1_->SetRemoteContent(&content, CA_ANSWER, NULL));
@@ skipping 185 matching lines @@
     CreateChannels(0, 0);
     typename T::Content content1;
     CreateContent(0, kPcmuCodec, kH264Codec, &content1);
     content1.AddStream(stream1);
     EXPECT_TRUE(channel1_->SetLocalContent(&content1, CA_OFFER, NULL));
     EXPECT_TRUE(channel1_->Enable(true));
     EXPECT_EQ(1u, media_channel1_->send_streams().size());
 
     EXPECT_TRUE(channel2_->SetRemoteContent(&content1, CA_OFFER, NULL));
     EXPECT_EQ(1u, media_channel2_->recv_streams().size());
-    transport_controller1_->Connect(transport_controller2_.get());
+    ConnectFakeTransports();
 
     // Channel 2 do not send anything.
     typename T::Content content2;
     CreateContent(0, kPcmuCodec, kH264Codec, &content2);
     EXPECT_TRUE(channel1_->SetRemoteContent(&content2, CA_ANSWER, NULL));
     EXPECT_EQ(0u, media_channel1_->recv_streams().size());
     EXPECT_TRUE(channel2_->SetLocalContent(&content2, CA_ANSWER, NULL));
     EXPECT_TRUE(channel2_->Enable(true));
     EXPECT_EQ(0u, media_channel2_->send_streams().size());
 
@@ skipping 56 matching lines @@
     if (verify_playout_) {
       EXPECT_FALSE(media_channel2_->playout());
     }
     EXPECT_FALSE(media_channel2_->sending());
     EXPECT_TRUE(channel2_->SetLocalContent(&local_media_content2_,
                                            CA_ANSWER, NULL));
     if (verify_playout_) {
       EXPECT_FALSE(media_channel2_->playout());
     }
     EXPECT_FALSE(media_channel2_->sending());
-    transport_controller1_->Connect(transport_controller2_.get());
+    ConnectFakeTransports();
     if (verify_playout_) {
       EXPECT_TRUE(media_channel1_->playout());
     }
     EXPECT_FALSE(media_channel1_->sending());
     if (verify_playout_) {
       EXPECT_FALSE(media_channel2_->playout());
     }
     EXPECT_FALSE(media_channel2_->sending());
     EXPECT_TRUE(channel2_->Enable(true));
     if (verify_playout_) {
@@ skipping 27 matching lines @@
     EXPECT_FALSE(media_channel1_->sending());
     if (verify_playout_) {
       EXPECT_FALSE(media_channel2_->playout());
     }
     EXPECT_FALSE(media_channel2_->sending());
 
     EXPECT_TRUE(channel1_->SetLocalContent(&content1, CA_OFFER, NULL));
     EXPECT_TRUE(channel2_->SetRemoteContent(&content1, CA_OFFER, NULL));
     EXPECT_TRUE(channel2_->SetLocalContent(&content2, CA_PRANSWER, NULL));
     EXPECT_TRUE(channel1_->SetRemoteContent(&content2, CA_PRANSWER, NULL));
-    transport_controller1_->Connect(transport_controller2_.get());
+    ConnectFakeTransports();
 
     if (verify_playout_) {
       EXPECT_TRUE(media_channel1_->playout());
     }
     EXPECT_FALSE(media_channel1_->sending());  // remote InActive
     if (verify_playout_) {
       EXPECT_FALSE(media_channel2_->playout());  // local InActive
     }
     EXPECT_FALSE(media_channel2_->sending());  // local InActive
 
@@ skipping 28 matching lines @@
 
   // Tests that when the transport channel signals a candidate pair change
   // event, the media channel will receive a call on the network route change.
   void TestNetworkRouteChanges() {
     constexpr uint16_t kLocalNetId = 1;
     constexpr uint16_t kRemoteNetId = 2;
     constexpr int kLastPacketId = 100;
 
     CreateChannels(0, 0);
 
-    cricket::DtlsTransportInternal* transport_channel1 =
-        channel1_->rtp_dtls_transport();
-    ASSERT_TRUE(transport_channel1);
     typename T::MediaChannel* media_channel1 =
         static_cast<typename T::MediaChannel*>(channel1_->media_channel());
     ASSERT_TRUE(media_channel1);
 
     media_channel1->set_num_network_route_changes(0);
-    network_thread_->Invoke<void>(RTC_FROM_HERE, [transport_channel1] {
+    network_thread_->Invoke<void>(RTC_FROM_HERE, [this] {
       // The transport channel becomes disconnected.
-      transport_channel1->ice_transport()->SignalSelectedCandidatePairChanged(
-          transport_channel1->ice_transport(), nullptr, -1, false);
+      fake_rtp_dtls_transport1_->ice_transport()
+          ->SignalSelectedCandidatePairChanged(
+              fake_rtp_dtls_transport1_->ice_transport(), nullptr, -1, false);
     });
     WaitForThreads();
     EXPECT_EQ(1, media_channel1->num_network_route_changes());
     EXPECT_FALSE(media_channel1->last_network_route().connected);
     media_channel1->set_num_network_route_changes(0);
 
-    network_thread_->Invoke<void>(RTC_FROM_HERE, [this, transport_channel1,
-                                                  media_channel1, kLocalNetId,
-                                                  kRemoteNetId, kLastPacketId] {
+    network_thread_->Invoke<void>(RTC_FROM_HERE, [this, media_channel1,
+                                                  kLocalNetId, kRemoteNetId,
+                                                  kLastPacketId] {
       // The transport channel becomes connected.
       rtc::SocketAddress local_address("192.168.1.1", 1000 /* port number */);
       rtc::SocketAddress remote_address("192.168.1.2", 2000 /* port number */);
-      std::unique_ptr<cricket::CandidatePairInterface> candidate_pair(
-          transport_controller1_->CreateFakeCandidatePair(
-              local_address, kLocalNetId, remote_address, kRemoteNetId));
-      transport_channel1->ice_transport()->SignalSelectedCandidatePairChanged(
-          transport_channel1->ice_transport(), candidate_pair.get(),
-          kLastPacketId, true);
+      auto candidate_pair = cricket::FakeCandidatePair::Create(
+          local_address, kLocalNetId, remote_address, kRemoteNetId);
+      fake_rtp_dtls_transport1_->ice_transport()
+          ->SignalSelectedCandidatePairChanged(
+              fake_rtp_dtls_transport1_->ice_transport(), candidate_pair.get(),
+              kLastPacketId, true);
     });
     WaitForThreads();
     EXPECT_EQ(1, media_channel1->num_network_route_changes());
     rtc::NetworkRoute expected_network_route(true, kLocalNetId, kRemoteNetId,
                                              kLastPacketId);
     EXPECT_EQ(expected_network_route, media_channel1->last_network_route());
     EXPECT_EQ(kLastPacketId,
               media_channel1->last_network_route().last_sent_packet_id);
     constexpr int kTransportOverheadPerPacket = 28;  // Ipv4(20) + UDP(8).
     EXPECT_EQ(kTransportOverheadPerPacket,
@@ skipping 39 matching lines @@
     EXPECT_TRUE(SendInitiate());
     EXPECT_TRUE(SendAccept());
     EXPECT_TRUE(SendTerminate());
   }
 
   // Send voice RTP data to the other side and ensure it gets there.
   void SendRtpToRtp() {
     CreateChannels(RTCP_MUX | RTCP_MUX_REQUIRED, RTCP_MUX | RTCP_MUX_REQUIRED);
     EXPECT_TRUE(SendInitiate());
     EXPECT_TRUE(SendAccept());
-    EXPECT_EQ(1U, GetChannels1().size());
-    EXPECT_EQ(1U, GetChannels2().size());
+    EXPECT_FALSE(channel1_->NeedsRtcpTransport());
+    EXPECT_FALSE(channel2_->NeedsRtcpTransport());
     SendRtp1();
     SendRtp2();
     WaitForThreads();
     EXPECT_TRUE(CheckRtp1());
     EXPECT_TRUE(CheckRtp2());
     EXPECT_TRUE(CheckNoRtp1());
     EXPECT_TRUE(CheckNoRtp2());
   }
 
   void TestDeinit() {
     CreateChannels(0, 0);
     EXPECT_TRUE(SendInitiate());
     EXPECT_TRUE(SendAccept());
     SendRtp1();
     SendRtp2();
     SendRtcp1();
     SendRtcp2();
     // Do not wait, destroy channels.
     channel1_.reset(nullptr);
     channel2_.reset(nullptr);
   }
 
   // Check that RTCP can be transmitted between both sides.
   void SendRtcpToRtcp() {
     CreateChannels(0, 0);
     EXPECT_TRUE(SendInitiate());
     EXPECT_TRUE(SendAccept());
-    EXPECT_EQ(2U, GetChannels1().size());
-    EXPECT_EQ(2U, GetChannels2().size());
+    EXPECT_TRUE(channel1_->NeedsRtcpTransport());
+    EXPECT_TRUE(channel2_->NeedsRtcpTransport());
     SendRtcp1();
     SendRtcp2();
     WaitForThreads();
     EXPECT_TRUE(CheckRtcp1());
     EXPECT_TRUE(CheckRtcp2());
     EXPECT_TRUE(CheckNoRtcp1());
     EXPECT_TRUE(CheckNoRtcp2());
   }
 
   // Check that RTCP is transmitted if only the initiator supports mux.
   void SendRtcpMuxToRtcp() {
     CreateChannels(RTCP_MUX, 0);
     EXPECT_TRUE(SendInitiate());
     EXPECT_TRUE(SendAccept());
-    EXPECT_EQ(2U, GetChannels1().size());
-    EXPECT_EQ(2U, GetChannels2().size());
+    EXPECT_TRUE(channel1_->NeedsRtcpTransport());
+    EXPECT_TRUE(channel2_->NeedsRtcpTransport());
     SendRtcp1();
     SendRtcp2();
     WaitForThreads();
     EXPECT_TRUE(CheckRtcp1());
     EXPECT_TRUE(CheckRtcp2());
     EXPECT_TRUE(CheckNoRtcp1());
     EXPECT_TRUE(CheckNoRtcp2());
   }
 
   // Check that RTP and RTCP are transmitted ok when both sides support mux.
   void SendRtcpMuxToRtcpMux() {
     CreateChannels(RTCP_MUX, RTCP_MUX);
     EXPECT_TRUE(SendInitiate());
-    EXPECT_EQ(2U, GetChannels1().size());
-    EXPECT_EQ(1U, GetChannels2().size());
+    EXPECT_TRUE(channel1_->NeedsRtcpTransport());
+    EXPECT_FALSE(channel2_->NeedsRtcpTransport());
+    EXPECT_EQ(0, rtcp_mux_activated_callbacks1_);
     EXPECT_TRUE(SendAccept());
-    EXPECT_EQ(1U, GetChannels1().size());
+    EXPECT_FALSE(channel1_->NeedsRtcpTransport());
+    EXPECT_EQ(1, rtcp_mux_activated_callbacks1_);
     SendRtp1();
     SendRtp2();
     SendRtcp1();
     SendRtcp2();
     WaitForThreads();
     EXPECT_TRUE(CheckRtp1());
     EXPECT_TRUE(CheckRtp2());
     EXPECT_TRUE(CheckNoRtp1());
     EXPECT_TRUE(CheckNoRtp2());
     EXPECT_TRUE(CheckRtcp1());
     EXPECT_TRUE(CheckRtcp2());
     EXPECT_TRUE(CheckNoRtcp1());
     EXPECT_TRUE(CheckNoRtcp2());
   }
 
   // Check that RTP and RTCP are transmitted ok when both sides
   // support mux and one the offerer requires mux.
   void SendRequireRtcpMuxToRtcpMux() {
     CreateChannels(RTCP_MUX | RTCP_MUX_REQUIRED, RTCP_MUX);
     EXPECT_TRUE(SendInitiate());
-    EXPECT_EQ(1U, GetChannels1().size());
-    EXPECT_EQ(1U, GetChannels2().size());
+    EXPECT_FALSE(channel1_->NeedsRtcpTransport());
+    EXPECT_FALSE(channel2_->NeedsRtcpTransport());
     EXPECT_TRUE(SendAccept());
     SendRtp1();
     SendRtp2();
     SendRtcp1();
     SendRtcp2();
     WaitForThreads();
     EXPECT_TRUE(CheckRtp1());
     EXPECT_TRUE(CheckRtp2());
     EXPECT_TRUE(CheckNoRtp1());
     EXPECT_TRUE(CheckNoRtp2());
     EXPECT_TRUE(CheckRtcp1());
     EXPECT_TRUE(CheckRtcp2());
     EXPECT_TRUE(CheckNoRtcp1());
     EXPECT_TRUE(CheckNoRtcp2());
   }
 
   // Check that RTP and RTCP are transmitted ok when both sides
   // support mux and only the answerer requires rtcp mux.
   void SendRtcpMuxToRequireRtcpMux() {
     CreateChannels(RTCP_MUX, RTCP_MUX | RTCP_MUX_REQUIRED);
     EXPECT_TRUE(SendInitiate());
-    EXPECT_EQ(2U, GetChannels1().size());
-    EXPECT_EQ(1U, GetChannels2().size());
+    EXPECT_TRUE(channel1_->NeedsRtcpTransport());
+    EXPECT_FALSE(channel2_->NeedsRtcpTransport());
+    EXPECT_EQ(0, rtcp_mux_activated_callbacks1_);
     EXPECT_TRUE(SendAccept());
-    EXPECT_EQ(1U, GetChannels1().size());
+    EXPECT_FALSE(channel1_->NeedsRtcpTransport());
+    EXPECT_EQ(1, rtcp_mux_activated_callbacks1_);
     SendRtp1();
     SendRtp2();
     SendRtcp1();
     SendRtcp2();
     WaitForThreads();
     EXPECT_TRUE(CheckRtp1());
     EXPECT_TRUE(CheckRtp2());
     EXPECT_TRUE(CheckNoRtp1());
     EXPECT_TRUE(CheckNoRtp2());
     EXPECT_TRUE(CheckRtcp1());
     EXPECT_TRUE(CheckRtcp2());
     EXPECT_TRUE(CheckNoRtcp1());
     EXPECT_TRUE(CheckNoRtcp2());
   }
 
   // Check that RTP and RTCP are transmitted ok when both sides
   // require mux.
   void SendRequireRtcpMuxToRequireRtcpMux() {
     CreateChannels(RTCP_MUX | RTCP_MUX_REQUIRED, RTCP_MUX | RTCP_MUX_REQUIRED);
     EXPECT_TRUE(SendInitiate());
-    EXPECT_EQ(1U, GetChannels1().size());
-    EXPECT_EQ(1U, GetChannels2().size());
+    EXPECT_FALSE(channel1_->NeedsRtcpTransport());
+    EXPECT_FALSE(channel2_->NeedsRtcpTransport());
     EXPECT_TRUE(SendAccept());
-    EXPECT_EQ(1U, GetChannels1().size());
+    EXPECT_FALSE(channel1_->NeedsRtcpTransport());
     SendRtp1();
     SendRtp2();
     SendRtcp1();
     SendRtcp2();
     WaitForThreads();
     EXPECT_TRUE(CheckRtp1());
     EXPECT_TRUE(CheckRtp2());
     EXPECT_TRUE(CheckNoRtp1());
     EXPECT_TRUE(CheckNoRtp2());
     EXPECT_TRUE(CheckRtcp1());
     EXPECT_TRUE(CheckRtcp2());
     EXPECT_TRUE(CheckNoRtcp1());
     EXPECT_TRUE(CheckNoRtcp2());
   }
 
   // Check that SendAccept fails if the answerer doesn't support mux
   // and the offerer requires it.
   void SendRequireRtcpMuxToNoRtcpMux() {
     CreateChannels(RTCP_MUX | RTCP_MUX_REQUIRED, 0);
     EXPECT_TRUE(SendInitiate());
-    EXPECT_EQ(1U, GetChannels1().size());
-    EXPECT_EQ(2U, GetChannels2().size());
+    EXPECT_FALSE(channel1_->NeedsRtcpTransport());
+    EXPECT_TRUE(channel2_->NeedsRtcpTransport());
     EXPECT_FALSE(SendAccept());
   }
 
   // Check that RTCP data sent by the initiator before the accept is not muxed.
   void SendEarlyRtcpMuxToRtcp() {
     CreateChannels(RTCP_MUX, 0);
     EXPECT_TRUE(SendInitiate());
-    EXPECT_EQ(2U, GetChannels1().size());
-    EXPECT_EQ(2U, GetChannels2().size());
+    EXPECT_TRUE(channel1_->NeedsRtcpTransport());
+    EXPECT_TRUE(channel2_->NeedsRtcpTransport());
 
     // RTCP can be sent before the call is accepted, if the transport is ready.
     // It should not be muxed though, as the remote side doesn't support mux.
     SendRtcp1();
     WaitForThreads();
     EXPECT_TRUE(CheckNoRtp2());
     EXPECT_TRUE(CheckRtcp2());
 
     // Send RTCP packet from callee and verify that it is received.
     SendRtcp2();
     WaitForThreads();
     EXPECT_TRUE(CheckNoRtp1());
     EXPECT_TRUE(CheckRtcp1());
 
     // Complete call setup and ensure everything is still OK.
     EXPECT_TRUE(SendAccept());
-    EXPECT_EQ(2U, GetChannels1().size());
+    EXPECT_TRUE(channel1_->NeedsRtcpTransport());
     SendRtcp1();
     SendRtcp2();
     WaitForThreads();
     EXPECT_TRUE(CheckRtcp2());
     EXPECT_TRUE(CheckRtcp1());
   }
 
 
   // Check that RTCP data is not muxed until both sides have enabled muxing,
   // but that we properly demux before we get the accept message, since there
   // is a race between RTP data and the jingle accept.
   void SendEarlyRtcpMuxToRtcpMux() {
     CreateChannels(RTCP_MUX, RTCP_MUX);
     EXPECT_TRUE(SendInitiate());
-    EXPECT_EQ(2U, GetChannels1().size());
-    EXPECT_EQ(1U, GetChannels2().size());
+    EXPECT_TRUE(channel1_->NeedsRtcpTransport());
+    EXPECT_FALSE(channel2_->NeedsRtcpTransport());
 
     // RTCP can't be sent yet, since the RTCP transport isn't writable, and
     // we haven't yet received the accept that says we should mux.
     SendRtcp1();
     WaitForThreads();
     EXPECT_TRUE(CheckNoRtcp2());
 
     // Send muxed RTCP packet from callee and verify that it is received.
     SendRtcp2();
     WaitForThreads();
     EXPECT_TRUE(CheckNoRtp1());
     EXPECT_TRUE(CheckRtcp1());
 
     // Complete call setup and ensure everything is still OK.
+    EXPECT_EQ(0, rtcp_mux_activated_callbacks1_);
     EXPECT_TRUE(SendAccept());
-    EXPECT_EQ(1U, GetChannels1().size());
+    EXPECT_FALSE(channel1_->NeedsRtcpTransport());
+    EXPECT_EQ(1, rtcp_mux_activated_callbacks1_);
     SendRtcp1();
     SendRtcp2();
     WaitForThreads();
     EXPECT_TRUE(CheckRtcp2());
     EXPECT_TRUE(CheckRtcp1());
   }
 
   // Test that we properly send SRTP with RTCP in both directions.
-  // You can pass in DTLS and/or RTCP_MUX as flags.
+  // You can pass in DTLS, RTCP_MUX, GCM_CIPHER and RAW_PACKET_TRANSPORT as
+  // flags.
   void SendSrtpToSrtp(int flags1_in = 0, int flags2_in = 0) {
-    RTC_CHECK((flags1_in & ~(RTCP_MUX | DTLS | GCM_CIPHER)) == 0);
-    RTC_CHECK((flags2_in & ~(RTCP_MUX | DTLS | GCM_CIPHER)) == 0);
+    RTC_CHECK((flags1_in &
+               ~(RTCP_MUX | DTLS | GCM_CIPHER | RAW_PACKET_TRANSPORT)) == 0);
+    RTC_CHECK((flags2_in &
+               ~(RTCP_MUX | DTLS | GCM_CIPHER | RAW_PACKET_TRANSPORT)) == 0);
 
     int flags1 = SECURE | flags1_in;
     int flags2 = SECURE | flags2_in;
     bool dtls1 = !!(flags1_in & DTLS);
     bool dtls2 = !!(flags2_in & DTLS);
     CreateChannels(flags1, flags2);
     EXPECT_FALSE(channel1_->secure());
     EXPECT_FALSE(channel2_->secure());
     EXPECT_TRUE(SendInitiate());
     WaitForThreads();
@@ skipping 55 matching lines @@
   // sent and received. The test uses SRTP, RTCP mux and SSRC mux.
   void SendEarlyMediaUsingRtcpMuxSrtp() {
       int sequence_number1_1 = 0, sequence_number2_2 = 0;
 
       CreateChannels(SSRC_MUX | RTCP_MUX | SECURE,
                      SSRC_MUX | RTCP_MUX | SECURE);
       EXPECT_TRUE(SendOffer());
       EXPECT_TRUE(SendProvisionalAnswer());
       EXPECT_TRUE(channel1_->secure());
       EXPECT_TRUE(channel2_->secure());
-      EXPECT_EQ(2U, GetChannels1().size());
-      EXPECT_EQ(2U, GetChannels2().size());
+      EXPECT_TRUE(channel1_->NeedsRtcpTransport());
+      EXPECT_TRUE(channel2_->NeedsRtcpTransport());
       WaitForThreads();  // Wait for 'sending' flag go through network thread.
       SendCustomRtcp1(kSsrc1);
       SendCustomRtp1(kSsrc1, ++sequence_number1_1);
       WaitForThreads();
       EXPECT_TRUE(CheckCustomRtcp2(kSsrc1));
       EXPECT_TRUE(CheckCustomRtp2(kSsrc1, sequence_number1_1));
 
       // Send packets from callee and verify that it is received.
       SendCustomRtcp2(kSsrc2);
       SendCustomRtp2(kSsrc2, ++sequence_number2_2);
       WaitForThreads();
       EXPECT_TRUE(CheckCustomRtcp1(kSsrc2));
       EXPECT_TRUE(CheckCustomRtp1(kSsrc2, sequence_number2_2));
 
       // Complete call setup and ensure everything is still OK.
+      EXPECT_EQ(0, rtcp_mux_activated_callbacks1_);
+      EXPECT_EQ(0, rtcp_mux_activated_callbacks2_);
       EXPECT_TRUE(SendFinalAnswer());
-      EXPECT_EQ(1U, GetChannels1().size());
-      EXPECT_EQ(1U, GetChannels2().size());
+      EXPECT_FALSE(channel1_->NeedsRtcpTransport());
+      EXPECT_FALSE(channel2_->NeedsRtcpTransport());
+      EXPECT_EQ(1, rtcp_mux_activated_callbacks1_);
+      EXPECT_EQ(1, rtcp_mux_activated_callbacks2_);
       EXPECT_TRUE(channel1_->secure());
       EXPECT_TRUE(channel2_->secure());
       SendCustomRtcp1(kSsrc1);
       SendCustomRtp1(kSsrc1, ++sequence_number1_1);
       SendCustomRtcp2(kSsrc2);
       SendCustomRtp2(kSsrc2, ++sequence_number2_2);
       WaitForThreads();
       EXPECT_TRUE(CheckCustomRtcp2(kSsrc1));
       EXPECT_TRUE(CheckCustomRtp2(kSsrc1, sequence_number1_1));
       EXPECT_TRUE(CheckCustomRtcp1(kSsrc2));
@@ skipping 45 matching lines @@
     EXPECT_TRUE(CheckNoRtcp1());
     EXPECT_TRUE(CheckNoRtcp2());
   }
 
   // Test that the mediachannel retains its sending state after the transport
   // becomes non-writable.
   void SendWithWritabilityLoss() {
     CreateChannels(RTCP_MUX | RTCP_MUX_REQUIRED, RTCP_MUX | RTCP_MUX_REQUIRED);
     EXPECT_TRUE(SendInitiate());
     EXPECT_TRUE(SendAccept());
-    EXPECT_EQ(1U, GetChannels1().size());
-    EXPECT_EQ(1U, GetChannels2().size());
+    EXPECT_FALSE(channel1_->NeedsRtcpTransport());
+    EXPECT_FALSE(channel2_->NeedsRtcpTransport());
     SendRtp1();
     SendRtp2();
     WaitForThreads();
     EXPECT_TRUE(CheckRtp1());
     EXPECT_TRUE(CheckRtp2());
     EXPECT_TRUE(CheckNoRtp1());
     EXPECT_TRUE(CheckNoRtp2());
 
     // Lose writability, which should fail.
-    network_thread_->Invoke<void>(
-        RTC_FROM_HERE, [this] { GetFakeChannel1(1)->SetWritable(false); });
+    network_thread_->Invoke<void>(RTC_FROM_HERE, [this] {
+      fake_rtp_dtls_transport1_->SetWritable(false);
+    });
     SendRtp1();
     SendRtp2();
     WaitForThreads();
     EXPECT_TRUE(CheckRtp1());
     EXPECT_TRUE(CheckNoRtp2());
 
     // Regain writability
-    network_thread_->Invoke<void>(
-        RTC_FROM_HERE, [this] { GetFakeChannel1(1)->SetWritable(true); });
+    network_thread_->Invoke<void>(RTC_FROM_HERE, [this] {
+      fake_rtp_dtls_transport1_->SetWritable(true);
+    });
     EXPECT_TRUE(media_channel1_->sending());
     SendRtp1();
     SendRtp2();
     WaitForThreads();
     EXPECT_TRUE(CheckRtp1());
     EXPECT_TRUE(CheckRtp2());
     EXPECT_TRUE(CheckNoRtp1());
     EXPECT_TRUE(CheckNoRtp2());
 
     // Lose writability completely
-    network_thread_->Invoke<void>(
-        RTC_FROM_HERE, [this] { GetFakeChannel1(1)->SetDestination(nullptr); });
+    network_thread_->Invoke<void>(RTC_FROM_HERE, [this] {
+      bool asymmetric = true;
+      fake_rtp_dtls_transport1_->SetDestination(nullptr, asymmetric);
+    });
     EXPECT_TRUE(media_channel1_->sending());
 
     // Should fail also.
     SendRtp1();
     SendRtp2();
     WaitForThreads();
     EXPECT_TRUE(CheckRtp1());
     EXPECT_TRUE(CheckNoRtp2());
     EXPECT_TRUE(CheckNoRtp1());
 
     // Gain writability back
     network_thread_->Invoke<void>(RTC_FROM_HERE, [this] {
-      GetFakeChannel1(1)->SetDestination(GetFakeChannel2(1));
+      bool asymmetric = true;
+      fake_rtp_dtls_transport1_->SetDestination(fake_rtp_dtls_transport2_.get(),
+                                                asymmetric);
     });
     EXPECT_TRUE(media_channel1_->sending());
     SendRtp1();
     SendRtp2();
     WaitForThreads();
     EXPECT_TRUE(CheckRtp1());
     EXPECT_TRUE(CheckRtp2());
     EXPECT_TRUE(CheckNoRtp1());
     EXPECT_TRUE(CheckNoRtp2());
   }
 
   void SendBundleToBundle(
       const int* pl_types, int len, bool rtcp_mux, bool secure) {
     ASSERT_EQ(2, len);
     int sequence_number1_1 = 0, sequence_number2_2 = 0;
     // Only pl_type1 was added to the bundle filter for both |channel1_|
     // and |channel2_|.
     int pl_type1 = pl_types[0];
     int pl_type2 = pl_types[1];
     int flags = SSRC_MUX;
     if (secure) flags |= SECURE;
-    uint32_t expected_channels = 2U;
     if (rtcp_mux) {
       flags |= RTCP_MUX;
-      expected_channels = 1U;
     }
     CreateChannels(flags, flags);
     EXPECT_TRUE(SendInitiate());
-    EXPECT_EQ(2U, GetChannels1().size());
-    EXPECT_EQ(expected_channels, GetChannels2().size());
+    EXPECT_TRUE(channel1_->NeedsRtcpTransport());
+    EXPECT_EQ(rtcp_mux, !channel2_->NeedsRtcpTransport());
     EXPECT_TRUE(SendAccept());
-    EXPECT_EQ(expected_channels, GetChannels1().size());
-    EXPECT_EQ(expected_channels, GetChannels2().size());
+    EXPECT_EQ(rtcp_mux, !channel1_->NeedsRtcpTransport());
+    EXPECT_EQ(rtcp_mux, !channel2_->NeedsRtcpTransport());
     EXPECT_TRUE(channel1_->bundle_filter()->FindPayloadType(pl_type1));
     EXPECT_TRUE(channel2_->bundle_filter()->FindPayloadType(pl_type1));
     EXPECT_FALSE(channel1_->bundle_filter()->FindPayloadType(pl_type2));
     EXPECT_FALSE(channel2_->bundle_filter()->FindPayloadType(pl_type2));
 
     // Both channels can receive pl_type1 only.
     SendCustomRtp1(kSsrc1, ++sequence_number1_1, pl_type1);
     SendCustomRtp2(kSsrc2, ++sequence_number2_2, pl_type1);
     WaitForThreads();
     EXPECT_TRUE(CheckCustomRtp2(kSsrc1, sequence_number1_1, pl_type1));
@@ skipping 159 matching lines @@
         sdesc3.get(), cricket::CA_ANSWER, &err));
     EXPECT_TRUE(media_channel1_->HasSendStream(1));
     EXPECT_FALSE(media_channel1_->HasRecvStream(2));
     EXPECT_TRUE(media_channel1_->HasRecvStream(3));
   }
 
   void TestFlushRtcp() {
     CreateChannels(0, 0);
     EXPECT_TRUE(SendInitiate());
     EXPECT_TRUE(SendAccept());
-    EXPECT_EQ(2U, GetChannels1().size());
-    EXPECT_EQ(2U, GetChannels2().size());
+    EXPECT_TRUE(channel1_->NeedsRtcpTransport());
+    EXPECT_TRUE(channel2_->NeedsRtcpTransport());
 
     // Send RTCP1 from a different thread.
     ScopedCallThread send_rtcp([this] { SendRtcp1(); });
     // The sending message is only posted.  channel2_ should be empty.
     EXPECT_TRUE(CheckNoRtcp2());
     rtc::Thread* wait_for[] = {send_rtcp.thread()};
     WaitForThreads(wait_for);  // Ensure rtcp was posted
 
     // When channel1_ is deleted, the RTCP packet should be sent out to
     // channel2_.
@@ skipping 71 matching lines @@
                              rtc::PacketOptions());
     WaitForThreads();
     EXPECT_EQ(cricket::SrtpFilter::ERROR_FAIL, error_handler.error_);
     EXPECT_EQ(cricket::SrtpFilter::PROTECT, error_handler.mode_);
 
     // Testing failures in receiving packets.
     error_handler.error_ = cricket::SrtpFilter::ERROR_NONE;
     error_handler.mode_ = cricket::SrtpFilter::UNPROTECT;
 
     network_thread_->Invoke<void>(RTC_FROM_HERE, [this] {
-      cricket::DtlsTransportInternal* transport_channel =
-          channel2_->rtp_dtls_transport();
-      transport_channel->SignalReadPacket(
-          transport_channel, reinterpret_cast<const char*>(kBadPacket),
-          sizeof(kBadPacket), rtc::PacketTime(), 0);
+      fake_rtp_dtls_transport2_->SignalReadPacket(
+          fake_rtp_dtls_transport2_.get(),
+          reinterpret_cast<const char*>(kBadPacket), sizeof(kBadPacket),
+          rtc::PacketTime(), 0);
     });
     EXPECT_EQ(cricket::SrtpFilter::ERROR_FAIL, error_handler.error_);
     EXPECT_EQ(cricket::SrtpFilter::UNPROTECT, error_handler.mode_);
     // Terminate channels before the fake clock is destroyed.
     EXPECT_TRUE(SendTerminate());
   }
 
   void TestOnReadyToSend() {
     CreateChannels(0, 0);
-    DtlsTransportInternal* rtp = channel1_->rtp_dtls_transport();
-    DtlsTransportInternal* rtcp = channel1_->rtcp_dtls_transport();
+    cricket::FakeDtlsTransport* rtp = fake_rtp_dtls_transport1_.get();
+    cricket::FakeDtlsTransport* rtcp = fake_rtcp_dtls_transport1_.get();
     EXPECT_FALSE(media_channel1_->ready_to_send());
 
     network_thread_->Invoke<void>(RTC_FROM_HERE,
                                   [rtp] { rtp->SignalReadyToSend(rtp); });
     WaitForThreads();
     EXPECT_FALSE(media_channel1_->ready_to_send());
 
     network_thread_->Invoke<void>(RTC_FROM_HERE,
                                   [rtcp] { rtcp->SignalReadyToSend(rtcp); });
     WaitForThreads();
@@ skipping 25 matching lines @@
       channel1_->SetTransportChannelReadyToSend(true, true);
     });
     WaitForThreads();
     EXPECT_TRUE(media_channel1_->ready_to_send());
   }
 
   void TestOnReadyToSendWithRtcpMux() {
     CreateChannels(0, 0);
     typename T::Content content;
     CreateContent(0, kPcmuCodec, kH264Codec, &content);
-    // Both sides agree on mux. Should no longer be a separate RTCP channel.
+    // Both sides agree on mux. Should signal that RTCP mux is fully active.
     content.set_rtcp_mux(true);
     EXPECT_TRUE(channel1_->SetLocalContent(&content, CA_OFFER, NULL));
+    EXPECT_EQ(0, rtcp_mux_activated_callbacks1_);
     EXPECT_TRUE(channel1_->SetRemoteContent(&content, CA_ANSWER, NULL));
-    EXPECT_TRUE(channel1_->rtcp_dtls_transport() == NULL);
-    DtlsTransportInternal* rtp = channel1_->rtp_dtls_transport();
+    EXPECT_EQ(1, rtcp_mux_activated_callbacks1_);
+    cricket::FakeDtlsTransport* rtp = fake_rtp_dtls_transport1_.get();
     EXPECT_FALSE(media_channel1_->ready_to_send());
     // In the case of rtcp mux, the SignalReadyToSend() from rtp channel
     // should trigger the MediaChannel's OnReadyToSend.
     network_thread_->Invoke<void>(RTC_FROM_HERE,
                                   [rtp] { rtp->SignalReadyToSend(rtp); });
     WaitForThreads();
     EXPECT_TRUE(media_channel1_->ready_to_send());
 
     network_thread_->Invoke<void>(RTC_FROM_HERE, [this] {
       channel1_->SetTransportChannelReadyToSend(false, false);
@@ skipping 70 matching lines @@
           RTC_FROM_HERE, [this] { ProcessThreadQueue(network_thread_); });
     }
     // Worker thread = current Thread process received messages.
     ProcessThreadQueue(rtc::Thread::Current());
   }
   // TODO(pbos): Remove playout from all media channels and let renderers mute
   // themselves.
   const bool verify_playout_;
   std::unique_ptr<rtc::Thread> network_thread_keeper_;
   rtc::Thread* network_thread_;
-  std::unique_ptr<cricket::FakeTransportController> transport_controller1_;
-  std::unique_ptr<cricket::FakeTransportController> transport_controller2_;
+  std::unique_ptr<cricket::FakeDtlsTransport> fake_rtp_dtls_transport1_;
+  std::unique_ptr<cricket::FakeDtlsTransport> fake_rtcp_dtls_transport1_;
+  std::unique_ptr<cricket::FakeDtlsTransport> fake_rtp_dtls_transport2_;
+  std::unique_ptr<cricket::FakeDtlsTransport> fake_rtcp_dtls_transport2_;
+  std::unique_ptr<rtc::FakePacketTransport> fake_rtp_packet_transport1_;
+  std::unique_ptr<rtc::FakePacketTransport> fake_rtcp_packet_transport1_;
+  std::unique_ptr<rtc::FakePacketTransport> fake_rtp_packet_transport2_;
+  std::unique_ptr<rtc::FakePacketTransport> fake_rtcp_packet_transport2_;
   cricket::FakeMediaEngine media_engine_;
   // The media channels are owned by the voice channel objects below.
-  typename T::MediaChannel* media_channel1_;
-  typename T::MediaChannel* media_channel2_;
+  typename T::MediaChannel* media_channel1_ = nullptr;
+  typename T::MediaChannel* media_channel2_ = nullptr;
   std::unique_ptr<typename T::Channel> channel1_;
   std::unique_ptr<typename T::Channel> channel2_;
   typename T::Content local_media_content1_;
   typename T::Content local_media_content2_;
   typename T::Content remote_media_content1_;
   typename T::Content remote_media_content2_;
   // The RTP and RTCP packets to send in the tests.
   rtc::Buffer rtp_packet_;
   rtc::Buffer rtcp_packet_;
-  int media_info_callbacks1_;
-  int media_info_callbacks2_;
+  int media_info_callbacks1_ = 0;
+  int media_info_callbacks2_ = 0;
+  int rtcp_mux_activated_callbacks1_ = 0;
+  int rtcp_mux_activated_callbacks2_ = 0;
   cricket::CandidatePairInterface* last_selected_candidate_pair_;
 };
 
 template<>
 void ChannelTest<VoiceTraits>::CreateContent(
     int flags,
     const cricket::AudioCodec& audio_codec,
     const cricket::VideoCodec& video_codec,
     cricket::AudioContentDescription* audio) {
   audio->AddCodec(audio_codec);
@@ skipping 41 matching lines @@
       : Base(true, kPcmuFrame, kRtcpReport, NetworkIsWorker::No) {}
 };
 
 // override to add NULL parameter
 template <>
 cricket::VideoChannel* ChannelTest<VideoTraits>::CreateChannel(
     rtc::Thread* worker_thread,
     rtc::Thread* network_thread,
     cricket::MediaEngineInterface* engine,
     cricket::FakeVideoMediaChannel* ch,
-    cricket::TransportController* transport_controller,
+    cricket::DtlsTransportInternal* fake_rtp_dtls_transport,
+    cricket::DtlsTransportInternal* fake_rtcp_dtls_transport,
+    rtc::PacketTransportInterface* fake_rtp_packet_transport,
+    rtc::PacketTransportInterface* fake_rtcp_packet_transport,
     int flags) {
-  rtc::Thread* signaling_thread =
-      transport_controller ? transport_controller->signaling_thread() : nullptr;
+  rtc::Thread* signaling_thread = rtc::Thread::Current();
   cricket::VideoChannel* channel = new cricket::VideoChannel(
       worker_thread, network_thread, signaling_thread, ch, cricket::CN_VIDEO,
       (flags & RTCP_MUX_REQUIRED) != 0, (flags & SECURE) != 0);
   rtc::CryptoOptions crypto_options;
   crypto_options.enable_gcm_crypto_suites = (flags & GCM_CIPHER) != 0;
   channel->SetCryptoOptions(crypto_options);
-  cricket::DtlsTransportInternal* rtp_dtls_transport =
-      transport_controller->CreateDtlsTransport(
-          channel->content_name(), cricket::ICE_CANDIDATE_COMPONENT_RTP);
-  cricket::DtlsTransportInternal* rtcp_dtls_transport = nullptr;
-  if (channel->NeedsRtcpTransport()) {
-    rtcp_dtls_transport = transport_controller->CreateDtlsTransport(
-        channel->content_name(), cricket::ICE_CANDIDATE_COMPONENT_RTCP);
+  if (!channel->NeedsRtcpTransport()) {
+    fake_rtcp_dtls_transport = nullptr;
   }
-  if (!channel->Init_w(rtp_dtls_transport, rtcp_dtls_transport)) {
+  if (!channel->Init_w(fake_rtp_dtls_transport, fake_rtcp_dtls_transport,
+                       fake_rtp_packet_transport, fake_rtcp_packet_transport)) {
     delete channel;
     channel = NULL;
   }
   return channel;
 }
 
 // override to add 0 parameter
 template<>
 bool ChannelTest<VideoTraits>::AddStream1(int id) {
   return channel1_->AddRecvStream(cricket::StreamParams::CreateLegacy(id));
@@ skipping 213 matching lines @@
 TEST_F(VoiceChannelSingleThreadTest, SendDtlsSrtpToDtlsSrtpGcmTwo) {
   MAYBE_SKIP_TEST(HaveDtlsSrtp);
   Base::SendSrtpToSrtp(DTLS, DTLS | GCM_CIPHER);
 }
 
 TEST_F(VoiceChannelSingleThreadTest, SendDtlsSrtpToDtlsSrtpRtcpMux) {
   MAYBE_SKIP_TEST(HaveDtlsSrtp);
   Base::SendSrtpToSrtp(DTLS | RTCP_MUX, DTLS | RTCP_MUX);
 }
 
+// Test using the channel with a raw packet interface, as opposed to a DTLS
+// transport interface.
+TEST_F(VoiceChannelSingleThreadTest, SendSrtpToSrtpWithRawPacketTransport) {
+  Base::SendSrtpToSrtp(RAW_PACKET_TRANSPORT, RAW_PACKET_TRANSPORT);
+}
+
 TEST_F(VoiceChannelSingleThreadTest, SendEarlyMediaUsingRtcpMuxSrtp) {
   Base::SendEarlyMediaUsingRtcpMuxSrtp();
 }
 
 TEST_F(VoiceChannelSingleThreadTest, SendRtpToRtpOnThread) {
   Base::SendRtpToRtpOnThread();
 }
 
 TEST_F(VoiceChannelSingleThreadTest, SendSrtpToSrtpOnThread) {
   Base::SendSrtpToSrtpOnThread();
@@ skipping 313 matching lines @@
 TEST_F(VoiceChannelDoubleThreadTest, SendDtlsSrtpToDtlsSrtpGcmTwo) {
   MAYBE_SKIP_TEST(HaveDtlsSrtp);
   Base::SendSrtpToSrtp(DTLS, DTLS | GCM_CIPHER);
 }
 
 TEST_F(VoiceChannelDoubleThreadTest, SendDtlsSrtpToDtlsSrtpRtcpMux) {
   MAYBE_SKIP_TEST(HaveDtlsSrtp);
   Base::SendSrtpToSrtp(DTLS | RTCP_MUX, DTLS | RTCP_MUX);
 }
 
+// Test using the channel with a raw packet interface, as opposed to a DTLS
+// transport interface.
+TEST_F(VoiceChannelDoubleThreadTest, SendSrtpToSrtpWithRawPacketTransport) {
+  Base::SendSrtpToSrtp(RAW_PACKET_TRANSPORT, RAW_PACKET_TRANSPORT);
+}
+
 TEST_F(VoiceChannelDoubleThreadTest, SendEarlyMediaUsingRtcpMuxSrtp) {
   Base::SendEarlyMediaUsingRtcpMuxSrtp();
 }
 
 TEST_F(VoiceChannelDoubleThreadTest, SendRtpToRtpOnThread) {
   Base::SendRtpToRtpOnThread();
 }
 
 TEST_F(VoiceChannelDoubleThreadTest, SendSrtpToSrtpOnThread) {
   Base::SendSrtpToSrtpOnThread();
@@ skipping 290 matching lines @@
 TEST_F(VideoChannelSingleThreadTest, SendDtlsSrtpToDtlsSrtp) {
   MAYBE_SKIP_TEST(HaveDtlsSrtp);
   Base::SendSrtpToSrtp(DTLS, DTLS);
 }
 
 TEST_F(VideoChannelSingleThreadTest, SendDtlsSrtpToDtlsSrtpRtcpMux) {
   MAYBE_SKIP_TEST(HaveDtlsSrtp);
   Base::SendSrtpToSrtp(DTLS | RTCP_MUX, DTLS | RTCP_MUX);
 }
 
+// Test using the channel with a raw packet interface, as opposed to a DTLS
+// transport interface.
+TEST_F(VideoChannelSingleThreadTest, SendSrtpToSrtpWithRawPacketTransport) {
+  Base::SendSrtpToSrtp(RAW_PACKET_TRANSPORT, RAW_PACKET_TRANSPORT);
+}
+
 TEST_F(VideoChannelSingleThreadTest, SendSrtcpMux) {
   Base::SendSrtpToSrtp(RTCP_MUX, RTCP_MUX);
 }
 
 TEST_F(VideoChannelSingleThreadTest, SendEarlyMediaUsingRtcpMuxSrtp) {
   Base::SendEarlyMediaUsingRtcpMuxSrtp();
 }
 
 TEST_F(VideoChannelSingleThreadTest, SendRtpToRtpOnThread) {
   Base::SendRtpToRtpOnThread();
@@ skipping 212 matching lines @@
 TEST_F(VideoChannelDoubleThreadTest, SendDtlsSrtpToDtlsSrtp) {
   MAYBE_SKIP_TEST(HaveDtlsSrtp);
   Base::SendSrtpToSrtp(DTLS, DTLS);
 }
 
 TEST_F(VideoChannelDoubleThreadTest, SendDtlsSrtpToDtlsSrtpRtcpMux) {
   MAYBE_SKIP_TEST(HaveDtlsSrtp);
   Base::SendSrtpToSrtp(DTLS | RTCP_MUX, DTLS | RTCP_MUX);
 }
 
+// Test using the channel with a raw packet interface, as opposed to a DTLS
+// transport interface.
+TEST_F(VideoChannelDoubleThreadTest, SendSrtpToSrtpWithRawPacketTransport) {
+  Base::SendSrtpToSrtp(RAW_PACKET_TRANSPORT, RAW_PACKET_TRANSPORT);
+}
+
 TEST_F(VideoChannelDoubleThreadTest, SendSrtcpMux) {
   Base::SendSrtpToSrtp(RTCP_MUX, RTCP_MUX);
 }
 
 TEST_F(VideoChannelDoubleThreadTest, SendEarlyMediaUsingRtcpMuxSrtp) {
   Base::SendEarlyMediaUsingRtcpMuxSrtp();
 }
 
 TEST_F(VideoChannelDoubleThreadTest, SendRtpToRtpOnThread) {
   Base::SendRtpToRtpOnThread();
@@ skipping 87 matching lines @@
       : Base(true, kDataPacket, kRtcpReport, NetworkIsWorker::No) {}
 };
 
 // Override to avoid engine channel parameter.
 template <>
 cricket::RtpDataChannel* ChannelTest<DataTraits>::CreateChannel(
     rtc::Thread* worker_thread,
     rtc::Thread* network_thread,
     cricket::MediaEngineInterface* engine,
     cricket::FakeDataMediaChannel* ch,
-    cricket::TransportController* transport_controller,
+    cricket::DtlsTransportInternal* fake_rtp_dtls_transport,
+    cricket::DtlsTransportInternal* fake_rtcp_dtls_transport,
+    rtc::PacketTransportInterface* fake_rtp_packet_transport,
+    rtc::PacketTransportInterface* fake_rtcp_packet_transport,
     int flags) {
-  rtc::Thread* signaling_thread =
-      transport_controller ? transport_controller->signaling_thread() : nullptr;
+  rtc::Thread* signaling_thread = rtc::Thread::Current();
   cricket::RtpDataChannel* channel = new cricket::RtpDataChannel(
       worker_thread, network_thread, signaling_thread, ch, cricket::CN_DATA,
       (flags & RTCP_MUX_REQUIRED) != 0, (flags & SECURE) != 0);
   rtc::CryptoOptions crypto_options;
   crypto_options.enable_gcm_crypto_suites = (flags & GCM_CIPHER) != 0;
   channel->SetCryptoOptions(crypto_options);
-  cricket::DtlsTransportInternal* rtp_dtls_transport =
-      transport_controller->CreateDtlsTransport(
-          channel->content_name(), cricket::ICE_CANDIDATE_COMPONENT_RTP);
-  cricket::DtlsTransportInternal* rtcp_dtls_transport = nullptr;
-  if (channel->NeedsRtcpTransport()) {
-    rtcp_dtls_transport = transport_controller->CreateDtlsTransport(
-        channel->content_name(), cricket::ICE_CANDIDATE_COMPONENT_RTCP);
+  if (!channel->NeedsRtcpTransport()) {
+    fake_rtcp_dtls_transport = nullptr;
   }
-  if (!channel->Init_w(rtp_dtls_transport, rtcp_dtls_transport)) {
+  if (!channel->Init_w(fake_rtp_dtls_transport, fake_rtcp_dtls_transport,
+                       fake_rtp_packet_transport, fake_rtcp_packet_transport)) {
     delete channel;
     channel = NULL;
   }
   return channel;
 }
 
 template <>
 void ChannelTest<DataTraits>::CreateContent(
     int flags,
     const cricket::AudioCodec& audio_codec,
@@ skipping 296 matching lines @@
   EXPECT_EQ("foo", media_channel1_->last_sent_data());
 }
 
 #if RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
 
 // Verifies some DCHECKs are in place.
 // Uses VoiceChannel, but any BaseChannel subclass would work.
 class BaseChannelDeathTest : public testing::Test {
  public:
   BaseChannelDeathTest()
-      :  // RTCP mux not required, SRTP required.
+      : fake_rtp_dtls_transport_("foo", cricket::ICE_CANDIDATE_COMPONENT_RTP),
+        fake_rtcp_dtls_transport_("foo", cricket::ICE_CANDIDATE_COMPONENT_RTCP),
+        // RTCP mux not required, SRTP required.
         voice_channel_(
             rtc::Thread::Current(),
             rtc::Thread::Current(),
             rtc::Thread::Current(),
             &fake_media_engine_,
             new cricket::FakeVoiceMediaChannel(nullptr,
                                                cricket::AudioOptions()),
             cricket::CN_AUDIO,
             false,
-            true) {
-    rtp_transport_ = fake_transport_controller_.CreateDtlsTransport(
-        "foo", cricket::ICE_CANDIDATE_COMPONENT_RTP);
-    rtcp_transport_ = fake_transport_controller_.CreateDtlsTransport(
-        "foo", cricket::ICE_CANDIDATE_COMPONENT_RTCP);
-    EXPECT_TRUE(voice_channel_.Init_w(rtp_transport_, rtcp_transport_));
-  }
+            true) {}
 
  protected:
-  cricket::FakeTransportController fake_transport_controller_;
   cricket::FakeMediaEngine fake_media_engine_;
+  cricket::FakeDtlsTransport fake_rtp_dtls_transport_;
+  cricket::FakeDtlsTransport fake_rtcp_dtls_transport_;
   cricket::VoiceChannel voice_channel_;
-  // Will be cleaned up by FakeTransportController, don't need to worry about
-  // deleting them in this test.
-  cricket::DtlsTransportInternal* rtp_transport_;
-  cricket::DtlsTransportInternal* rtcp_transport_;
 };
 
-TEST_F(BaseChannelDeathTest, SetTransportWithNullRtpTransport) {
-  cricket::DtlsTransportInternal* new_rtcp_transport =
-      fake_transport_controller_.CreateDtlsTransport(
-          "bar", cricket::ICE_CANDIDATE_COMPONENT_RTCP);
-  EXPECT_DEATH(voice_channel_.SetTransports(nullptr, new_rtcp_transport), "");
+TEST_F(BaseChannelDeathTest, SetTransportsWithNullRtpTransport) {
+  ASSERT_TRUE(voice_channel_.Init_w(
+      &fake_rtp_dtls_transport_, &fake_rtcp_dtls_transport_,
+      &fake_rtp_dtls_transport_, &fake_rtcp_dtls_transport_));
+  cricket::FakeDtlsTransport new_rtcp_transport(
+      "bar", cricket::ICE_CANDIDATE_COMPONENT_RTCP);
+  EXPECT_DEATH(voice_channel_.SetTransports(nullptr, &new_rtcp_transport), "");
 }
 
-TEST_F(BaseChannelDeathTest, SetTransportWithMissingRtcpTransport) {
-  cricket::DtlsTransportInternal* new_rtp_transport =
-      fake_transport_controller_.CreateDtlsTransport(
-          "bar", cricket::ICE_CANDIDATE_COMPONENT_RTP);
-  EXPECT_DEATH(voice_channel_.SetTransports(new_rtp_transport, nullptr), "");
+TEST_F(BaseChannelDeathTest, SetTransportsWithMissingRtcpTransport) {
+  ASSERT_TRUE(voice_channel_.Init_w(
+      &fake_rtp_dtls_transport_, &fake_rtcp_dtls_transport_,
+      &fake_rtp_dtls_transport_, &fake_rtcp_dtls_transport_));
+  cricket::FakeDtlsTransport new_rtp_transport(
+      "bar", cricket::ICE_CANDIDATE_COMPONENT_RTP);
+  EXPECT_DEATH(voice_channel_.SetTransports(&new_rtp_transport, nullptr), "");
 }
 
-TEST_F(BaseChannelDeathTest, SetTransportWithUnneededRtcpTransport) {
+TEST_F(BaseChannelDeathTest, SetTransportsWithUnneededRtcpTransport) {
+  ASSERT_TRUE(voice_channel_.Init_w(
+      &fake_rtp_dtls_transport_, &fake_rtcp_dtls_transport_,
+      &fake_rtp_dtls_transport_, &fake_rtcp_dtls_transport_));
   // Activate RTCP muxing, simulating offer/answer negotiation.
   cricket::AudioContentDescription content;
   content.set_rtcp_mux(true);
   ASSERT_TRUE(voice_channel_.SetLocalContent(&content, CA_OFFER, nullptr));
   ASSERT_TRUE(voice_channel_.SetRemoteContent(&content, CA_ANSWER, nullptr));
-  cricket::DtlsTransportInternal* new_rtp_transport =
-      fake_transport_controller_.CreateDtlsTransport(
-          "bar", cricket::ICE_CANDIDATE_COMPONENT_RTP);
-  cricket::DtlsTransportInternal* new_rtcp_transport =
-      fake_transport_controller_.CreateDtlsTransport(
-          "bar", cricket::ICE_CANDIDATE_COMPONENT_RTCP);
+  cricket::FakeDtlsTransport new_rtp_transport(
+      "bar", cricket::ICE_CANDIDATE_COMPONENT_RTP);
+  cricket::FakeDtlsTransport new_rtcp_transport(
+      "bar", cricket::ICE_CANDIDATE_COMPONENT_RTCP);
   // After muxing is enabled, no RTCP transport should be passed in here.
   EXPECT_DEATH(
-      voice_channel_.SetTransports(new_rtp_transport, new_rtcp_transport), "");
+      voice_channel_.SetTransports(&new_rtp_transport, &new_rtcp_transport),
+      "");
 }
 
 // This test will probably go away if/when we move the transport name out of
 // the transport classes and into their parent classes.
-TEST_F(BaseChannelDeathTest, SetTransportWithMismatchingTransportNames) {
-  cricket::DtlsTransportInternal* new_rtp_transport =
-      fake_transport_controller_.CreateDtlsTransport(
-          "bar", cricket::ICE_CANDIDATE_COMPONENT_RTP);
-  cricket::DtlsTransportInternal* new_rtcp_transport =
-      fake_transport_controller_.CreateDtlsTransport(
-          "baz", cricket::ICE_CANDIDATE_COMPONENT_RTCP);
+TEST_F(BaseChannelDeathTest, SetTransportsWithMismatchingTransportNames) {
+  ASSERT_TRUE(voice_channel_.Init_w(
+      &fake_rtp_dtls_transport_, &fake_rtcp_dtls_transport_,
+      &fake_rtp_dtls_transport_, &fake_rtcp_dtls_transport_));
+  cricket::FakeDtlsTransport new_rtp_transport(
+      "bar", cricket::ICE_CANDIDATE_COMPONENT_RTP);
+  cricket::FakeDtlsTransport new_rtcp_transport(
+      "baz", cricket::ICE_CANDIDATE_COMPONENT_RTCP);
   EXPECT_DEATH(
-      voice_channel_.SetTransports(new_rtp_transport, new_rtcp_transport), "");
+      voice_channel_.SetTransports(&new_rtp_transport, &new_rtcp_transport),
+      "");
+}
+
+// Not expected to support going from DtlsTransportInternal to
+// PacketTransportInterface.
+TEST_F(BaseChannelDeathTest, SetTransportsDtlsToNonDtls) {
+  ASSERT_TRUE(voice_channel_.Init_w(
+      &fake_rtp_dtls_transport_, &fake_rtcp_dtls_transport_,
+      &fake_rtp_dtls_transport_, &fake_rtcp_dtls_transport_));
+  EXPECT_DEATH(
+      voice_channel_.SetTransports(static_cast<rtc::PacketTransportInterface*>(
+                                       &fake_rtp_dtls_transport_),
+                                   static_cast<rtc::PacketTransportInterface*>(
+                                       &fake_rtp_dtls_transport_)),
+      "");
+}
+
+// Not expected to support going from PacketTransportInterface to
+// DtlsTransportInternal.
+TEST_F(BaseChannelDeathTest, SetTransportsNonDtlsToDtls) {
+  ASSERT_TRUE(voice_channel_.Init_w(nullptr, nullptr, &fake_rtp_dtls_transport_,
+                                    &fake_rtcp_dtls_transport_));
+  EXPECT_DEATH(voice_channel_.SetTransports(&fake_rtp_dtls_transport_,
+                                            &fake_rtp_dtls_transport_),
+               "");
 }
 
 #endif  // RTC_DCHECK_IS_ON && GTEST_HAS_DEATH_TEST && !defined(WEBRTC_ANDROID)
 
 // TODO(pthatcher): TestSetReceiver?