pc/test/fake_peer_connection_for_stats.h - src - Git at Google

 /*
  *  Copyright 2018 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.
  */

 #ifndef PC_TEST_FAKE_PEER_CONNECTION_FOR_STATS_H_
 #define PC_TEST_FAKE_PEER_CONNECTION_FOR_STATS_H_

 #include <map>
 #include <memory>
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>

 #include "media/base/fake_media_engine.h"
 #include "media/base/media_channel.h"
 #include "pc/channel.h"
 #include "pc/stream_collection.h"
 #include "pc/test/fake_data_channel_controller.h"
 #include "pc/test/fake_peer_connection_base.h"

 namespace webrtc {

 // Fake VoiceMediaChannel where the result of GetStats can be configured.
 class FakeVoiceMediaSendChannelForStats
     : public cricket::FakeVoiceMediaSendChannel {
  public:
   explicit FakeVoiceMediaSendChannelForStats(TaskQueueBase* network_thread)
       : cricket::FakeVoiceMediaSendChannel(cricket::AudioOptions(),
                                            network_thread) {}

   void SetStats(const cricket::VoiceMediaInfo& voice_info) {
     send_stats_ = cricket::VoiceMediaSendInfo();
     send_stats_->senders = voice_info.senders;
     send_stats_->send_codecs = voice_info.send_codecs;
   }

   // VoiceMediaChannel overrides.
   bool GetStats(cricket::VoiceMediaSendInfo* info) override {
     if (send_stats_) {
       *info = *send_stats_;
       return true;
     }
     return false;
   }

  private:
   absl::optional<cricket::VoiceMediaSendInfo> send_stats_;
 };

 class FakeVoiceMediaReceiveChannelForStats
     : public cricket::FakeVoiceMediaReceiveChannel {
  public:
   explicit FakeVoiceMediaReceiveChannelForStats(TaskQueueBase* network_thread)
       : cricket::FakeVoiceMediaReceiveChannel(cricket::AudioOptions(),
                                               network_thread) {}

   void SetStats(const cricket::VoiceMediaInfo& voice_info) {
     receive_stats_ = cricket::VoiceMediaReceiveInfo();
     receive_stats_->receivers = voice_info.receivers;
     receive_stats_->receive_codecs = voice_info.receive_codecs;
     receive_stats_->device_underrun_count = voice_info.device_underrun_count;
   }

   // VoiceMediaChannel overrides.
   bool GetStats(cricket::VoiceMediaReceiveInfo* info,
                 bool get_and_clear_legacy_stats) override {
     if (receive_stats_) {
       *info = *receive_stats_;
       return true;
     }
     return false;
   }

  private:
   absl::optional<cricket::VoiceMediaReceiveInfo> receive_stats_;
 };

 // Fake VideoMediaChannel where the result of GetStats can be configured.
 class FakeVideoMediaSendChannelForStats
     : public cricket::FakeVideoMediaSendChannel {
  public:
   explicit FakeVideoMediaSendChannelForStats(TaskQueueBase* network_thread)
       : cricket::FakeVideoMediaSendChannel(cricket::VideoOptions(),
                                            network_thread) {}

   void SetStats(const cricket::VideoMediaInfo& video_info) {
     send_stats_ = cricket::VideoMediaSendInfo();
     send_stats_->senders = video_info.senders;
     send_stats_->aggregated_senders = video_info.aggregated_senders;
     send_stats_->send_codecs = video_info.send_codecs;
   }

   // VideoMediaChannel overrides.
   bool GetStats(cricket::VideoMediaSendInfo* info) override {
     if (send_stats_) {
       *info = *send_stats_;
       return true;
     }
     return false;
   }

  private:
   absl::optional<cricket::VideoMediaSendInfo> send_stats_;
 };

 class FakeVideoMediaReceiveChannelForStats
     : public cricket::FakeVideoMediaReceiveChannel {
  public:
   explicit FakeVideoMediaReceiveChannelForStats(TaskQueueBase* network_thread)
       : cricket::FakeVideoMediaReceiveChannel(cricket::VideoOptions(),
                                               network_thread) {}

   void SetStats(const cricket::VideoMediaInfo& video_info) {
     receive_stats_ = cricket::VideoMediaReceiveInfo();
     receive_stats_->receivers = video_info.receivers;
     receive_stats_->receive_codecs = video_info.receive_codecs;
   }

   // VideoMediaChannel overrides.
   bool GetStats(cricket::VideoMediaReceiveInfo* info) override {
     if (receive_stats_) {
       *info = *receive_stats_;
       return true;
     }
     return false;
   }

  private:
   absl::optional<cricket::VideoMediaReceiveInfo> receive_stats_;
 };

 constexpr bool kDefaultRtcpMuxRequired = true;
 constexpr bool kDefaultSrtpRequired = true;

 class VoiceChannelForTesting : public cricket::VoiceChannel {
  public:
   VoiceChannelForTesting(
       rtc::Thread* worker_thread,
       rtc::Thread* network_thread,
       rtc::Thread* signaling_thread,
       std::unique_ptr<cricket::VoiceMediaSendChannelInterface> send_channel,
       std::unique_ptr<cricket::VoiceMediaReceiveChannelInterface>
           receive_channel,
       const std::string& content_name,
       bool srtp_required,
       webrtc::CryptoOptions crypto_options,
       rtc::UniqueRandomIdGenerator* ssrc_generator,
       std::string transport_name)
       : VoiceChannel(worker_thread,
                      network_thread,
                      signaling_thread,
                      std::move(send_channel),
                      std::move(receive_channel),
                      content_name,
                      srtp_required,
                      std::move(crypto_options),
                      ssrc_generator),
         test_transport_name_(std::move(transport_name)) {}

  private:
   absl::string_view transport_name() const override {
     return test_transport_name_;
   }

   const std::string test_transport_name_;
 };

 class VideoChannelForTesting : public cricket::VideoChannel {
  public:
   VideoChannelForTesting(
       rtc::Thread* worker_thread,
       rtc::Thread* network_thread,
       rtc::Thread* signaling_thread,
       std::unique_ptr<cricket::VideoMediaSendChannelInterface> send_channel,
       std::unique_ptr<cricket::VideoMediaReceiveChannelInterface>
           receive_channel,
       const std::string& content_name,
       bool srtp_required,
       webrtc::CryptoOptions crypto_options,
       rtc::UniqueRandomIdGenerator* ssrc_generator,
       std::string transport_name)
       : VideoChannel(worker_thread,
                      network_thread,
                      signaling_thread,
                      std::move(send_channel),
                      std::move(receive_channel),
                      content_name,
                      srtp_required,
                      std::move(crypto_options),
                      ssrc_generator),
         test_transport_name_(std::move(transport_name)) {}

  private:
   absl::string_view transport_name() const override {
     return test_transport_name_;
   }

   const std::string test_transport_name_;
 };

 // This class is intended to be fed into the StatsCollector and
 // RTCStatsCollector so that the stats functionality can be unit tested.
 // Individual tests can configure this fake as needed to simulate scenarios
 // under which to test the stats collectors.
 class FakePeerConnectionForStats : public FakePeerConnectionBase {
  public:
   // TODO(steveanton): Add support for specifying separate threads to test
   // multi-threading correctness.
   FakePeerConnectionForStats()
       : network_thread_(rtc::Thread::Current()),
         worker_thread_(rtc::Thread::Current()),
         signaling_thread_(rtc::Thread::Current()),
         // TODO(hta): remove separate thread variables and use context.
         dependencies_(MakeDependencies()),
         context_(ConnectionContext::Create(&dependencies_)),
         local_streams_(StreamCollection::Create()),
         remote_streams_(StreamCollection::Create()),
         data_channel_controller_(network_thread_) {}

   ~FakePeerConnectionForStats() {
     for (auto transceiver : transceivers_) {
       transceiver->internal()->ClearChannel();
     }
   }

   static PeerConnectionFactoryDependencies MakeDependencies() {
     PeerConnectionFactoryDependencies dependencies;
     dependencies.network_thread = rtc::Thread::Current();
     dependencies.worker_thread = rtc::Thread::Current();
     dependencies.signaling_thread = rtc::Thread::Current();
     dependencies.media_engine = std::make_unique<cricket::FakeMediaEngine>();
     return dependencies;
   }

   rtc::scoped_refptr<StreamCollection> mutable_local_streams() {
     return local_streams_;
   }

   rtc::scoped_refptr<StreamCollection> mutable_remote_streams() {
     return remote_streams_;
   }

   rtc::scoped_refptr<RtpSenderInterface> AddSender(
       rtc::scoped_refptr<RtpSenderInternal> sender) {
     // TODO(steveanton): Switch tests to use RtpTransceivers directly.
     auto sender_proxy = RtpSenderProxyWithInternal<RtpSenderInternal>::Create(
         signaling_thread_, sender);
     GetOrCreateFirstTransceiverOfType(sender->media_type())
         ->internal()
         ->AddSender(sender_proxy);
     return sender_proxy;
   }

   void RemoveSender(rtc::scoped_refptr<RtpSenderInterface> sender) {
     GetOrCreateFirstTransceiverOfType(sender->media_type())
         ->internal()
         ->RemoveSender(sender.get());
   }

   rtc::scoped_refptr<RtpReceiverInterface> AddReceiver(
       rtc::scoped_refptr<RtpReceiverInternal> receiver) {
     // TODO(steveanton): Switch tests to use RtpTransceivers directly.
     auto receiver_proxy =
         RtpReceiverProxyWithInternal<RtpReceiverInternal>::Create(
             signaling_thread_, worker_thread_, receiver);
     GetOrCreateFirstTransceiverOfType(receiver->media_type())
         ->internal()
         ->AddReceiver(receiver_proxy);
     return receiver_proxy;
   }

   void RemoveReceiver(rtc::scoped_refptr<RtpReceiverInterface> receiver) {
     GetOrCreateFirstTransceiverOfType(receiver->media_type())
         ->internal()
         ->RemoveReceiver(receiver.get());
   }

   std::pair<FakeVoiceMediaSendChannelForStats*,
             FakeVoiceMediaReceiveChannelForStats*>
   AddVoiceChannel(
       const std::string& mid,
       const std::string& transport_name,
       cricket::VoiceMediaInfo initial_stats = cricket::VoiceMediaInfo()) {
     auto voice_media_send_channel =
         std::make_unique<FakeVoiceMediaSendChannelForStats>(network_thread_);
     auto voice_media_receive_channel =
         std::make_unique<FakeVoiceMediaReceiveChannelForStats>(network_thread_);
     auto* voice_media_send_channel_ptr = voice_media_send_channel.get();
     auto* voice_media_receive_channel_ptr = voice_media_receive_channel.get();
     auto voice_channel = std::make_unique<VoiceChannelForTesting>(
         worker_thread_, network_thread_, signaling_thread_,
         std::move(voice_media_send_channel),
         std::move(voice_media_receive_channel), mid, kDefaultSrtpRequired,
         webrtc::CryptoOptions(), context_->ssrc_generator(), transport_name);
     auto transceiver =
         GetOrCreateFirstTransceiverOfType(cricket::MEDIA_TYPE_AUDIO)
             ->internal();
     if (transceiver->channel()) {
       // This transceiver already has a channel, create a new one.
       transceiver =
           CreateTransceiverOfType(cricket::MEDIA_TYPE_AUDIO)->internal();
     }
     RTC_DCHECK(!transceiver->channel());
     transceiver->SetChannel(std::move(voice_channel),
                             [](const std::string&) { return nullptr; });
     voice_media_send_channel_ptr->SetStats(initial_stats);
     voice_media_receive_channel_ptr->SetStats(initial_stats);
     return std::make_pair(voice_media_send_channel_ptr,
                           voice_media_receive_channel_ptr);
   }

   std::pair<FakeVideoMediaSendChannelForStats*,
             FakeVideoMediaReceiveChannelForStats*>
   AddVideoChannel(
       const std::string& mid,
       const std::string& transport_name,
       cricket::VideoMediaInfo initial_stats = cricket::VideoMediaInfo()) {
     auto video_media_send_channel =
         std::make_unique<FakeVideoMediaSendChannelForStats>(network_thread_);
     auto video_media_receive_channel =
         std::make_unique<FakeVideoMediaReceiveChannelForStats>(network_thread_);
     auto video_media_send_channel_ptr = video_media_send_channel.get();
     auto video_media_receive_channel_ptr = video_media_receive_channel.get();
     auto video_channel = std::make_unique<VideoChannelForTesting>(
         worker_thread_, network_thread_, signaling_thread_,
         std::move(video_media_send_channel),
         std::move(video_media_receive_channel), mid, kDefaultSrtpRequired,
         webrtc::CryptoOptions(), context_->ssrc_generator(), transport_name);
     auto transceiver =
         GetOrCreateFirstTransceiverOfType(cricket::MEDIA_TYPE_VIDEO)
             ->internal();
     if (transceiver->channel()) {
       // This transceiver already has a channel, create a new one.
       transceiver =
           CreateTransceiverOfType(cricket::MEDIA_TYPE_VIDEO)->internal();
     }
     RTC_DCHECK(!transceiver->channel());
     transceiver->SetChannel(std::move(video_channel),
                             [](const std::string&) { return nullptr; });
     video_media_send_channel_ptr->SetStats(initial_stats);
     video_media_receive_channel_ptr->SetStats(initial_stats);
     return std::make_pair(video_media_send_channel_ptr,
                           video_media_receive_channel_ptr);
   }

   void AddSctpDataChannel(const std::string& label) {
     AddSctpDataChannel(label, InternalDataChannelInit());
   }

   void AddSctpDataChannel(const std::string& label,
                           const InternalDataChannelInit& init) {
     // TODO(bugs.webrtc.org/11547): Supply a separate network thread.
     AddSctpDataChannel(SctpDataChannel::Create(
         data_channel_controller_.weak_ptr(), label, false, init,
         rtc::Thread::Current(), rtc::Thread::Current()));
   }

   void AddSctpDataChannel(rtc::scoped_refptr<SctpDataChannel> data_channel) {
     sctp_data_channels_.push_back(data_channel);
   }

   void SetTransportStats(const std::string& transport_name,
                          const cricket::TransportChannelStats& channel_stats) {
     SetTransportStats(
         transport_name,
         std::vector<cricket::TransportChannelStats>{channel_stats});
   }

   void SetTransportStats(
       const std::string& transport_name,
       const std::vector<cricket::TransportChannelStats>& channel_stats_list) {
     cricket::TransportStats transport_stats;
     transport_stats.transport_name = transport_name;
     transport_stats.channel_stats = channel_stats_list;
     transport_stats_by_name_[transport_name] = transport_stats;
   }

   void SetCallStats(const Call::Stats& call_stats) { call_stats_ = call_stats; }

   void SetAudioDeviceStats(
       absl::optional<AudioDeviceModule::Stats> audio_device_stats) {
     audio_device_stats_ = audio_device_stats;
   }

   void SetLocalCertificate(
       const std::string& transport_name,
       rtc::scoped_refptr<rtc::RTCCertificate> certificate) {
     local_certificates_by_transport_[transport_name] = certificate;
   }

   void SetRemoteCertChain(const std::string& transport_name,
                           std::unique_ptr<rtc::SSLCertChain> chain) {
     remote_cert_chains_by_transport_[transport_name] = std::move(chain);
   }

   // PeerConnectionInterface overrides.

   rtc::scoped_refptr<StreamCollectionInterface> local_streams() override {
     return local_streams_;
   }

   rtc::scoped_refptr<StreamCollectionInterface> remote_streams() override {
     return remote_streams_;
   }

   std::vector<rtc::scoped_refptr<RtpSenderInterface>> GetSenders()
       const override {
     std::vector<rtc::scoped_refptr<RtpSenderInterface>> senders;
     for (auto transceiver : transceivers_) {
       for (auto sender : transceiver->internal()->senders()) {
         senders.push_back(sender);
       }
     }
     return senders;
   }

   std::vector<rtc::scoped_refptr<RtpReceiverInterface>> GetReceivers()
       const override {
     std::vector<rtc::scoped_refptr<RtpReceiverInterface>> receivers;
     for (auto transceiver : transceivers_) {
       for (auto receiver : transceiver->internal()->receivers()) {
         receivers.push_back(receiver);
       }
     }
     return receivers;
   }

   // PeerConnectionInternal overrides.

   rtc::Thread* network_thread() const override { return network_thread_; }

   rtc::Thread* worker_thread() const override { return worker_thread_; }

   rtc::Thread* signaling_thread() const override { return signaling_thread_; }

   std::vector<
       rtc::scoped_refptr<RtpTransceiverProxyWithInternal<RtpTransceiver>>>
   GetTransceiversInternal() const override {
     return transceivers_;
   }

   std::vector<DataChannelStats> GetDataChannelStats() const override {
     RTC_DCHECK_RUN_ON(signaling_thread());
     std::vector<DataChannelStats> stats;
     for (const auto& channel : sctp_data_channels_)
       stats.push_back(channel->GetStats());
     return stats;
   }

   cricket::CandidateStatsList GetPooledCandidateStats() const override {
     return {};
   }

   std::map<std::string, cricket::TransportStats> GetTransportStatsByNames(
       const std::set<std::string>& transport_names) override {
     RTC_DCHECK_RUN_ON(network_thread_);
     std::map<std::string, cricket::TransportStats> transport_stats_by_name;
     for (const std::string& transport_name : transport_names) {
       transport_stats_by_name[transport_name] =
           GetTransportStatsByName(transport_name);
     }
     return transport_stats_by_name;
   }

   Call::Stats GetCallStats() override { return call_stats_; }

   absl::optional<AudioDeviceModule::Stats> GetAudioDeviceStats() override {
     return audio_device_stats_;
   }

   bool GetLocalCertificate(
       const std::string& transport_name,
       rtc::scoped_refptr<rtc::RTCCertificate>* certificate) override {
     auto it = local_certificates_by_transport_.find(transport_name);
     if (it != local_certificates_by_transport_.end()) {
       *certificate = it->second;
       return true;
     } else {
       return false;
     }
   }

   std::unique_ptr<rtc::SSLCertChain> GetRemoteSSLCertChain(
       const std::string& transport_name) override {
     auto it = remote_cert_chains_by_transport_.find(transport_name);
     if (it != remote_cert_chains_by_transport_.end()) {
       return it->second->Clone();
     } else {
       return nullptr;
     }
   }

  private:
   cricket::TransportStats GetTransportStatsByName(
       const std::string& transport_name) {
     auto it = transport_stats_by_name_.find(transport_name);
     if (it != transport_stats_by_name_.end()) {
       // If specific transport stats have been specified, return those.
       return it->second;
     }
     // Otherwise, generate some dummy stats.
     cricket::TransportChannelStats channel_stats;
     channel_stats.component = cricket::ICE_CANDIDATE_COMPONENT_RTP;
     cricket::TransportStats transport_stats;
     transport_stats.transport_name = transport_name;
     transport_stats.channel_stats.push_back(channel_stats);
     return transport_stats;
   }

   rtc::scoped_refptr<RtpTransceiverProxyWithInternal<RtpTransceiver>>
   GetOrCreateFirstTransceiverOfType(cricket::MediaType media_type) {
     for (auto transceiver : transceivers_) {
       if (transceiver->internal()->media_type() == media_type) {
         return transceiver;
       }
     }
     return CreateTransceiverOfType(media_type);
   }

   rtc::scoped_refptr<RtpTransceiverProxyWithInternal<RtpTransceiver>>
   CreateTransceiverOfType(cricket::MediaType media_type) {
     auto transceiver = RtpTransceiverProxyWithInternal<RtpTransceiver>::Create(
         signaling_thread_,
         rtc::make_ref_counted<RtpTransceiver>(media_type, context_.get()));
     transceivers_.push_back(transceiver);
     return transceiver;
   }

   rtc::Thread* const network_thread_;
   rtc::Thread* const worker_thread_;
   rtc::Thread* const signaling_thread_;

   PeerConnectionFactoryDependencies dependencies_;
   rtc::scoped_refptr<ConnectionContext> context_;

   rtc::scoped_refptr<StreamCollection> local_streams_;
   rtc::scoped_refptr<StreamCollection> remote_streams_;

   std::vector<
       rtc::scoped_refptr<RtpTransceiverProxyWithInternal<RtpTransceiver>>>
       transceivers_;

   FakeDataChannelController data_channel_controller_;

   std::vector<rtc::scoped_refptr<SctpDataChannel>> sctp_data_channels_;

   std::map<std::string, cricket::TransportStats> transport_stats_by_name_;

   Call::Stats call_stats_;

   absl::optional<AudioDeviceModule::Stats> audio_device_stats_;

   std::map<std::string, rtc::scoped_refptr<rtc::RTCCertificate>>
       local_certificates_by_transport_;
   std::map<std::string, std::unique_ptr<rtc::SSLCertChain>>
       remote_cert_chains_by_transport_;
 };

 }  // namespace webrtc

 #endif  // PC_TEST_FAKE_PEER_CONNECTION_FOR_STATS_H_
	/*
	* Copyright 2018 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.
	*/

	#ifndef PC_TEST_FAKE_PEER_CONNECTION_FOR_STATS_H_
	#define PC_TEST_FAKE_PEER_CONNECTION_FOR_STATS_H_

	#include <map>
	#include <memory>
	#include <set>
	#include <string>
	#include <utility>
	#include <vector>

	#include "media/base/fake_media_engine.h"
	#include "media/base/media_channel.h"
	#include "pc/channel.h"
	#include "pc/stream_collection.h"
	#include "pc/test/fake_data_channel_controller.h"
	#include "pc/test/fake_peer_connection_base.h"

	namespace webrtc {

	// Fake VoiceMediaChannel where the result of GetStats can be configured.
	class FakeVoiceMediaSendChannelForStats
	: public cricket::FakeVoiceMediaSendChannel {
	public:
	explicit FakeVoiceMediaSendChannelForStats(TaskQueueBase* network_thread)
	: cricket::FakeVoiceMediaSendChannel(cricket::AudioOptions(),
	network_thread) {}

	void SetStats(const cricket::VoiceMediaInfo& voice_info) {
	send_stats_ = cricket::VoiceMediaSendInfo();
	send_stats_->senders = voice_info.senders;
	send_stats_->send_codecs = voice_info.send_codecs;
	}

	// VoiceMediaChannel overrides.
	bool GetStats(cricket::VoiceMediaSendInfo* info) override {
	if (send_stats_) {
	info = send_stats_;
	return true;
	}
	return false;
	}

	private:
	absl::optional<cricket::VoiceMediaSendInfo> send_stats_;
	};

	class FakeVoiceMediaReceiveChannelForStats
	: public cricket::FakeVoiceMediaReceiveChannel {
	public:
	explicit FakeVoiceMediaReceiveChannelForStats(TaskQueueBase* network_thread)
	: cricket::FakeVoiceMediaReceiveChannel(cricket::AudioOptions(),
	network_thread) {}

	void SetStats(const cricket::VoiceMediaInfo& voice_info) {
	receive_stats_ = cricket::VoiceMediaReceiveInfo();
	receive_stats_->receivers = voice_info.receivers;
	receive_stats_->receive_codecs = voice_info.receive_codecs;
	receive_stats_->device_underrun_count = voice_info.device_underrun_count;
	}

	// VoiceMediaChannel overrides.
	bool GetStats(cricket::VoiceMediaReceiveInfo* info,
	bool get_and_clear_legacy_stats) override {
	if (receive_stats_) {
	info = receive_stats_;
	return true;
	}
	return false;
	}

	private:
	absl::optional<cricket::VoiceMediaReceiveInfo> receive_stats_;
	};

	// Fake VideoMediaChannel where the result of GetStats can be configured.
	class FakeVideoMediaSendChannelForStats
	: public cricket::FakeVideoMediaSendChannel {
	public:
	explicit FakeVideoMediaSendChannelForStats(TaskQueueBase* network_thread)
	: cricket::FakeVideoMediaSendChannel(cricket::VideoOptions(),
	network_thread) {}

	void SetStats(const cricket::VideoMediaInfo& video_info) {
	send_stats_ = cricket::VideoMediaSendInfo();
	send_stats_->senders = video_info.senders;
	send_stats_->aggregated_senders = video_info.aggregated_senders;
	send_stats_->send_codecs = video_info.send_codecs;
	}

	// VideoMediaChannel overrides.
	bool GetStats(cricket::VideoMediaSendInfo* info) override {
	if (send_stats_) {
	info = send_stats_;
	return true;
	}
	return false;
	}

	private:
	absl::optional<cricket::VideoMediaSendInfo> send_stats_;
	};

	class FakeVideoMediaReceiveChannelForStats
	: public cricket::FakeVideoMediaReceiveChannel {
	public:
	explicit FakeVideoMediaReceiveChannelForStats(TaskQueueBase* network_thread)
	: cricket::FakeVideoMediaReceiveChannel(cricket::VideoOptions(),
	network_thread) {}

	void SetStats(const cricket::VideoMediaInfo& video_info) {
	receive_stats_ = cricket::VideoMediaReceiveInfo();
	receive_stats_->receivers = video_info.receivers;
	receive_stats_->receive_codecs = video_info.receive_codecs;
	}

	// VideoMediaChannel overrides.
	bool GetStats(cricket::VideoMediaReceiveInfo* info) override {
	if (receive_stats_) {
	info = receive_stats_;
	return true;
	}
	return false;
	}

	private:
	absl::optional<cricket::VideoMediaReceiveInfo> receive_stats_;
	};

	constexpr bool kDefaultRtcpMuxRequired = true;
	constexpr bool kDefaultSrtpRequired = true;

	class VoiceChannelForTesting : public cricket::VoiceChannel {
	public:
	VoiceChannelForTesting(
	rtc::Thread* worker_thread,
	rtc::Thread* network_thread,
	rtc::Thread* signaling_thread,
	std::unique_ptr<cricket::VoiceMediaSendChannelInterface> send_channel,
	std::unique_ptr<cricket::VoiceMediaReceiveChannelInterface>
	receive_channel,
	const std::string& content_name,
	bool srtp_required,
	webrtc::CryptoOptions crypto_options,
	rtc::UniqueRandomIdGenerator* ssrc_generator,
	std::string transport_name)
	: VoiceChannel(worker_thread,
	network_thread,
	signaling_thread,
	std::move(send_channel),
	std::move(receive_channel),
	content_name,
	srtp_required,
	std::move(crypto_options),
	ssrc_generator),
	test_transport_name_(std::move(transport_name)) {}

	private:
	absl::string_view transport_name() const override {
	return test_transport_name_;
	}

	const std::string test_transport_name_;
	};

	class VideoChannelForTesting : public cricket::VideoChannel {
	public:
	VideoChannelForTesting(
	rtc::Thread* worker_thread,
	rtc::Thread* network_thread,
	rtc::Thread* signaling_thread,
	std::unique_ptr<cricket::VideoMediaSendChannelInterface> send_channel,
	std::unique_ptr<cricket::VideoMediaReceiveChannelInterface>
	receive_channel,
	const std::string& content_name,
	bool srtp_required,
	webrtc::CryptoOptions crypto_options,
	rtc::UniqueRandomIdGenerator* ssrc_generator,
	std::string transport_name)
	: VideoChannel(worker_thread,
	network_thread,
	signaling_thread,
	std::move(send_channel),
	std::move(receive_channel),
	content_name,
	srtp_required,
	std::move(crypto_options),
	ssrc_generator),
	test_transport_name_(std::move(transport_name)) {}

	private:
	absl::string_view transport_name() const override {
	return test_transport_name_;
	}

	const std::string test_transport_name_;
	};

	// This class is intended to be fed into the StatsCollector and
	// RTCStatsCollector so that the stats functionality can be unit tested.
	// Individual tests can configure this fake as needed to simulate scenarios
	// under which to test the stats collectors.
	class FakePeerConnectionForStats : public FakePeerConnectionBase {
	public:
	// TODO(steveanton): Add support for specifying separate threads to test
	// multi-threading correctness.
	FakePeerConnectionForStats()
	: network_thread_(rtc::Thread::Current()),
	worker_thread_(rtc::Thread::Current()),
	signaling_thread_(rtc::Thread::Current()),
	// TODO(hta): remove separate thread variables and use context.
	dependencies_(MakeDependencies()),
	context_(ConnectionContext::Create(&dependencies_)),
	local_streams_(StreamCollection::Create()),
	remote_streams_(StreamCollection::Create()),
	data_channel_controller_(network_thread_) {}

	~FakePeerConnectionForStats() {
	for (auto transceiver : transceivers_) {
	transceiver->internal()->ClearChannel();
	}
	}

	static PeerConnectionFactoryDependencies MakeDependencies() {
	PeerConnectionFactoryDependencies dependencies;
	dependencies.network_thread = rtc::Thread::Current();
	dependencies.worker_thread = rtc::Thread::Current();
	dependencies.signaling_thread = rtc::Thread::Current();
	dependencies.media_engine = std::make_unique<cricket::FakeMediaEngine>();
	return dependencies;
	}

	rtc::scoped_refptr<StreamCollection> mutable_local_streams() {
	return local_streams_;
	}

	rtc::scoped_refptr<StreamCollection> mutable_remote_streams() {
	return remote_streams_;
	}

	rtc::scoped_refptr<RtpSenderInterface> AddSender(
	rtc::scoped_refptr<RtpSenderInternal> sender) {
	// TODO(steveanton): Switch tests to use RtpTransceivers directly.
	auto sender_proxy = RtpSenderProxyWithInternal<RtpSenderInternal>::Create(
	signaling_thread_, sender);
	GetOrCreateFirstTransceiverOfType(sender->media_type())
	->internal()
	->AddSender(sender_proxy);
	return sender_proxy;
	}

	void RemoveSender(rtc::scoped_refptr<RtpSenderInterface> sender) {
	GetOrCreateFirstTransceiverOfType(sender->media_type())
	->internal()
	->RemoveSender(sender.get());
	}

	rtc::scoped_refptr<RtpReceiverInterface> AddReceiver(
	rtc::scoped_refptr<RtpReceiverInternal> receiver) {
	// TODO(steveanton): Switch tests to use RtpTransceivers directly.
	auto receiver_proxy =
	RtpReceiverProxyWithInternal<RtpReceiverInternal>::Create(
	signaling_thread_, worker_thread_, receiver);
	GetOrCreateFirstTransceiverOfType(receiver->media_type())
	->internal()
	->AddReceiver(receiver_proxy);
	return receiver_proxy;
	}

	void RemoveReceiver(rtc::scoped_refptr<RtpReceiverInterface> receiver) {
	GetOrCreateFirstTransceiverOfType(receiver->media_type())
	->internal()
	->RemoveReceiver(receiver.get());
	}

	std::pair<FakeVoiceMediaSendChannelForStats*,
	FakeVoiceMediaReceiveChannelForStats*>
	AddVoiceChannel(
	const std::string& mid,
	const std::string& transport_name,
	cricket::VoiceMediaInfo initial_stats = cricket::VoiceMediaInfo()) {
	auto voice_media_send_channel =
	std::make_unique<FakeVoiceMediaSendChannelForStats>(network_thread_);
	auto voice_media_receive_channel =
	std::make_unique<FakeVoiceMediaReceiveChannelForStats>(network_thread_);
	auto* voice_media_send_channel_ptr = voice_media_send_channel.get();
	auto* voice_media_receive_channel_ptr = voice_media_receive_channel.get();
	auto voice_channel = std::make_unique<VoiceChannelForTesting>(
	worker_thread_, network_thread_, signaling_thread_,
	std::move(voice_media_send_channel),
	std::move(voice_media_receive_channel), mid, kDefaultSrtpRequired,
	webrtc::CryptoOptions(), context_->ssrc_generator(), transport_name);
	auto transceiver =
	GetOrCreateFirstTransceiverOfType(cricket::MEDIA_TYPE_AUDIO)
	->internal();
	if (transceiver->channel()) {
	// This transceiver already has a channel, create a new one.
	transceiver =
	CreateTransceiverOfType(cricket::MEDIA_TYPE_AUDIO)->internal();
	}
	RTC_DCHECK(!transceiver->channel());
	transceiver->SetChannel(std::move(voice_channel),
	[](const std::string&) { return nullptr; });
	voice_media_send_channel_ptr->SetStats(initial_stats);
	voice_media_receive_channel_ptr->SetStats(initial_stats);
	return std::make_pair(voice_media_send_channel_ptr,
	voice_media_receive_channel_ptr);
	}

	std::pair<FakeVideoMediaSendChannelForStats*,
	FakeVideoMediaReceiveChannelForStats*>
	AddVideoChannel(
	const std::string& mid,
	const std::string& transport_name,
	cricket::VideoMediaInfo initial_stats = cricket::VideoMediaInfo()) {
	auto video_media_send_channel =
	std::make_unique<FakeVideoMediaSendChannelForStats>(network_thread_);
	auto video_media_receive_channel =
	std::make_unique<FakeVideoMediaReceiveChannelForStats>(network_thread_);
	auto video_media_send_channel_ptr = video_media_send_channel.get();
	auto video_media_receive_channel_ptr = video_media_receive_channel.get();
	auto video_channel = std::make_unique<VideoChannelForTesting>(
	worker_thread_, network_thread_, signaling_thread_,
	std::move(video_media_send_channel),
	std::move(video_media_receive_channel), mid, kDefaultSrtpRequired,
	webrtc::CryptoOptions(), context_->ssrc_generator(), transport_name);
	auto transceiver =
	GetOrCreateFirstTransceiverOfType(cricket::MEDIA_TYPE_VIDEO)
	->internal();
	if (transceiver->channel()) {
	// This transceiver already has a channel, create a new one.
	transceiver =
	CreateTransceiverOfType(cricket::MEDIA_TYPE_VIDEO)->internal();
	}
	RTC_DCHECK(!transceiver->channel());
	transceiver->SetChannel(std::move(video_channel),
	[](const std::string&) { return nullptr; });
	video_media_send_channel_ptr->SetStats(initial_stats);
	video_media_receive_channel_ptr->SetStats(initial_stats);
	return std::make_pair(video_media_send_channel_ptr,
	video_media_receive_channel_ptr);
	}

	void AddSctpDataChannel(const std::string& label) {
	AddSctpDataChannel(label, InternalDataChannelInit());
	}

	void AddSctpDataChannel(const std::string& label,
	const InternalDataChannelInit& init) {
	// TODO(bugs.webrtc.org/11547): Supply a separate network thread.
	AddSctpDataChannel(SctpDataChannel::Create(
	data_channel_controller_.weak_ptr(), label, false, init,
	rtc::Thread::Current(), rtc::Thread::Current()));
	}

	void AddSctpDataChannel(rtc::scoped_refptr<SctpDataChannel> data_channel) {
	sctp_data_channels_.push_back(data_channel);
	}

	void SetTransportStats(const std::string& transport_name,
	const cricket::TransportChannelStats& channel_stats) {
	SetTransportStats(
	transport_name,
	std::vector<cricket::TransportChannelStats>{channel_stats});
	}

	void SetTransportStats(
	const std::string& transport_name,
	const std::vector<cricket::TransportChannelStats>& channel_stats_list) {
	cricket::TransportStats transport_stats;
	transport_stats.transport_name = transport_name;
	transport_stats.channel_stats = channel_stats_list;
	transport_stats_by_name_[transport_name] = transport_stats;
	}

	void SetCallStats(const Call::Stats& call_stats) { call_stats_ = call_stats; }

	void SetAudioDeviceStats(
	absl::optional<AudioDeviceModule::Stats> audio_device_stats) {
	audio_device_stats_ = audio_device_stats;
	}

	void SetLocalCertificate(
	const std::string& transport_name,
	rtc::scoped_refptr<rtc::RTCCertificate> certificate) {
	local_certificates_by_transport_[transport_name] = certificate;
	}

	void SetRemoteCertChain(const std::string& transport_name,
	std::unique_ptr<rtc::SSLCertChain> chain) {
	remote_cert_chains_by_transport_[transport_name] = std::move(chain);
	}

	// PeerConnectionInterface overrides.

	rtc::scoped_refptr<StreamCollectionInterface> local_streams() override {
	return local_streams_;
	}

	rtc::scoped_refptr<StreamCollectionInterface> remote_streams() override {
	return remote_streams_;
	}

	std::vector<rtc::scoped_refptr<RtpSenderInterface>> GetSenders()
	const override {
	std::vector<rtc::scoped_refptr<RtpSenderInterface>> senders;
	for (auto transceiver : transceivers_) {
	for (auto sender : transceiver->internal()->senders()) {
	senders.push_back(sender);
	}
	}
	return senders;
	}

	std::vector<rtc::scoped_refptr<RtpReceiverInterface>> GetReceivers()
	const override {
	std::vector<rtc::scoped_refptr<RtpReceiverInterface>> receivers;
	for (auto transceiver : transceivers_) {
	for (auto receiver : transceiver->internal()->receivers()) {
	receivers.push_back(receiver);
	}
	}
	return receivers;
	}

	// PeerConnectionInternal overrides.

	rtc::Thread* network_thread() const override { return network_thread_; }

	rtc::Thread* worker_thread() const override { return worker_thread_; }

	rtc::Thread* signaling_thread() const override { return signaling_thread_; }

	std::vector<
	rtc::scoped_refptr<RtpTransceiverProxyWithInternal<RtpTransceiver>>>
	GetTransceiversInternal() const override {
	return transceivers_;
	}

	std::vector<DataChannelStats> GetDataChannelStats() const override {
	RTC_DCHECK_RUN_ON(signaling_thread());
	std::vector<DataChannelStats> stats;
	for (const auto& channel : sctp_data_channels_)
	stats.push_back(channel->GetStats());
	return stats;
	}

	cricket::CandidateStatsList GetPooledCandidateStats() const override {
	return {};
	}

	std::map<std::string, cricket::TransportStats> GetTransportStatsByNames(
	const std::set<std::string>& transport_names) override {
	RTC_DCHECK_RUN_ON(network_thread_);
	std::map<std::string, cricket::TransportStats> transport_stats_by_name;
	for (const std::string& transport_name : transport_names) {
	transport_stats_by_name[transport_name] =
	GetTransportStatsByName(transport_name);
	}
	return transport_stats_by_name;
	}

	Call::Stats GetCallStats() override { return call_stats_; }

	absl::optional<AudioDeviceModule::Stats> GetAudioDeviceStats() override {
	return audio_device_stats_;
	}

	bool GetLocalCertificate(
	const std::string& transport_name,
	rtc::scoped_refptr<rtc::RTCCertificate>* certificate) override {
	auto it = local_certificates_by_transport_.find(transport_name);
	if (it != local_certificates_by_transport_.end()) {
	*certificate = it->second;
	return true;
	} else {
	return false;
	}
	}

	std::unique_ptr<rtc::SSLCertChain> GetRemoteSSLCertChain(
	const std::string& transport_name) override {
	auto it = remote_cert_chains_by_transport_.find(transport_name);
	if (it != remote_cert_chains_by_transport_.end()) {
	return it->second->Clone();
	} else {
	return nullptr;
	}
	}

	private:
	cricket::TransportStats GetTransportStatsByName(
	const std::string& transport_name) {
	auto it = transport_stats_by_name_.find(transport_name);
	if (it != transport_stats_by_name_.end()) {
	// If specific transport stats have been specified, return those.
	return it->second;
	}
	// Otherwise, generate some dummy stats.
	cricket::TransportChannelStats channel_stats;
	channel_stats.component = cricket::ICE_CANDIDATE_COMPONENT_RTP;
	cricket::TransportStats transport_stats;
	transport_stats.transport_name = transport_name;
	transport_stats.channel_stats.push_back(channel_stats);
	return transport_stats;
	}

	rtc::scoped_refptr<RtpTransceiverProxyWithInternal<RtpTransceiver>>
	GetOrCreateFirstTransceiverOfType(cricket::MediaType media_type) {
	for (auto transceiver : transceivers_) {
	if (transceiver->internal()->media_type() == media_type) {
	return transceiver;
	}
	}
	return CreateTransceiverOfType(media_type);
	}

	rtc::scoped_refptr<RtpTransceiverProxyWithInternal<RtpTransceiver>>
	CreateTransceiverOfType(cricket::MediaType media_type) {
	auto transceiver = RtpTransceiverProxyWithInternal<RtpTransceiver>::Create(
	signaling_thread_,
	rtc::make_ref_counted<RtpTransceiver>(media_type, context_.get()));
	transceivers_.push_back(transceiver);
	return transceiver;
	}

	rtc::Thread* const network_thread_;
	rtc::Thread* const worker_thread_;
	rtc::Thread* const signaling_thread_;

	PeerConnectionFactoryDependencies dependencies_;
	rtc::scoped_refptr<ConnectionContext> context_;

	rtc::scoped_refptr<StreamCollection> local_streams_;
	rtc::scoped_refptr<StreamCollection> remote_streams_;

	std::vector<
	rtc::scoped_refptr<RtpTransceiverProxyWithInternal<RtpTransceiver>>>
	transceivers_;

	FakeDataChannelController data_channel_controller_;

	std::vector<rtc::scoped_refptr<SctpDataChannel>> sctp_data_channels_;

	std::map<std::string, cricket::TransportStats> transport_stats_by_name_;

	Call::Stats call_stats_;

	absl::optional<AudioDeviceModule::Stats> audio_device_stats_;

	std::map<std::string, rtc::scoped_refptr<rtc::RTCCertificate>>
	local_certificates_by_transport_;
	std::map<std::string, std::unique_ptr<rtc::SSLCertChain>>
	remote_cert_chains_by_transport_;
	};

	} // namespace webrtc

	#endif // PC_TEST_FAKE_PEER_CONNECTION_FOR_STATS_H_