pc/track_media_info_map_unittest.cc - src - Git at Google

 /*
  *  Copyright 2016 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 "pc/track_media_info_map.h"

 #include <cstddef>
 #include <cstdint>
 #include <initializer_list>
 #include <optional>
 #include <string>
 #include <utility>
 #include <vector>

 #include "api/make_ref_counted.h"
 #include "api/media_stream_interface.h"
 #include "api/media_types.h"
 #include "api/rtp_parameters.h"
 #include "api/scoped_refptr.h"
 #include "api/test/mock_video_track.h"
 #include "media/base/media_channel.h"
 #include "pc/audio_track.h"
 #include "pc/test/fake_video_track_source.h"
 #include "pc/test/mock_rtp_receiver_internal.h"
 #include "pc/test/mock_rtp_sender_internal.h"
 #include "pc/video_track.h"
 #include "rtc_base/thread.h"
 #include "test/gmock.h"
 #include "test/gtest.h"

 using ::testing::ElementsAre;

 namespace webrtc {

 namespace {

 RtpParameters CreateRtpParametersWithSsrcs(
     std::initializer_list<uint32_t> ssrcs) {
   RtpParameters params;
   for (uint32_t ssrc : ssrcs) {
     RtpEncodingParameters encoding_params;
     encoding_params.ssrc = ssrc;
     params.encodings.push_back(encoding_params);
   }
   return params;
 }

 scoped_refptr<MockRtpSenderInternal> CreateMockRtpSender(
     MediaType media_type,
     std::initializer_list<uint32_t> ssrcs,
     scoped_refptr<MediaStreamTrackInterface> track) {
   uint32_t first_ssrc;
   if (ssrcs.size()) {
     first_ssrc = *ssrcs.begin();
   } else {
     first_ssrc = 0;
   }
   auto sender = make_ref_counted<MockRtpSenderInternal>();
   EXPECT_CALL(*sender, track())
       .WillRepeatedly(::testing::Return(std::move(track)));
   EXPECT_CALL(*sender, ssrc()).WillRepeatedly(::testing::Return(first_ssrc));
   EXPECT_CALL(*sender, media_type())
       .WillRepeatedly(::testing::Return(media_type));
   EXPECT_CALL(*sender, GetParameters())
       .WillRepeatedly(::testing::Return(CreateRtpParametersWithSsrcs(ssrcs)));
   EXPECT_CALL(*sender, AttachmentId()).WillRepeatedly(::testing::Return(1));
   return sender;
 }

 scoped_refptr<MockRtpReceiverInternal> CreateMockRtpReceiver(
     MediaType media_type,
     std::initializer_list<uint32_t> ssrcs,
     scoped_refptr<MediaStreamTrackInterface> track) {
   auto receiver = make_ref_counted<MockRtpReceiverInternal>();
   EXPECT_CALL(*receiver, track())
       .WillRepeatedly(::testing::Return(std::move(track)));
   EXPECT_CALL(*receiver, media_type())
       .WillRepeatedly(::testing::Return(media_type));
   EXPECT_CALL(*receiver, GetParameters())
       .WillRepeatedly(::testing::Return(CreateRtpParametersWithSsrcs(ssrcs)));
   EXPECT_CALL(*receiver, AttachmentId()).WillRepeatedly(::testing::Return(1));
   return receiver;
 }

 scoped_refptr<VideoTrackInterface> CreateVideoTrack(const std::string& id) {
   return VideoTrack::Create(id, FakeVideoTrackSource::Create(false),
                             Thread::Current());
 }

 scoped_refptr<VideoTrackInterface> CreateMockVideoTrack(const std::string& id) {
   auto track = MockVideoTrack::Create();
   EXPECT_CALL(*track, kind())
       .WillRepeatedly(::testing::Return(VideoTrack::kVideoKind));
   return track;
 }

 class TrackMediaInfoMapTest : public ::testing::Test {
  public:
   TrackMediaInfoMapTest() : TrackMediaInfoMapTest(true) {}

   explicit TrackMediaInfoMapTest(bool use_real_video_track)
       : local_audio_track_(AudioTrack::Create("LocalAudioTrack", nullptr)),
         remote_audio_track_(AudioTrack::Create("RemoteAudioTrack", nullptr)),
         local_video_track_(use_real_video_track
                                ? CreateVideoTrack("LocalVideoTrack")
                                : CreateMockVideoTrack("LocalVideoTrack")),
         remote_video_track_(use_real_video_track
                                 ? CreateVideoTrack("RemoteVideoTrack")
                                 : CreateMockVideoTrack("LocalVideoTrack")) {}

   void AddRtpSenderWithSsrcs(std::initializer_list<uint32_t> ssrcs,
                              MediaStreamTrackInterface* local_track) {
     scoped_refptr<MockRtpSenderInternal> rtp_sender = CreateMockRtpSender(
         local_track->kind() == MediaStreamTrackInterface::kAudioKind
             ? MediaType::AUDIO
             : MediaType::VIDEO,
         ssrcs, scoped_refptr<MediaStreamTrackInterface>(local_track));
     rtp_senders_.push_back(rtp_sender);

     if (local_track->kind() == MediaStreamTrackInterface::kAudioKind) {
       VoiceSenderInfo voice_sender_info;
       size_t i = 0;
       for (uint32_t ssrc : ssrcs) {
         voice_sender_info.local_stats.push_back(SsrcSenderInfo());
         voice_sender_info.local_stats[i++].ssrc = ssrc;
       }
       voice_media_info_.senders.push_back(voice_sender_info);
     } else {
       VideoSenderInfo video_sender_info;
       size_t i = 0;
       for (uint32_t ssrc : ssrcs) {
         video_sender_info.local_stats.push_back(SsrcSenderInfo());
         video_sender_info.local_stats[i++].ssrc = ssrc;
       }
       video_media_info_.senders.push_back(video_sender_info);
       video_media_info_.aggregated_senders.push_back(video_sender_info);
     }
   }

   void AddRtpReceiverWithSsrcs(std::initializer_list<uint32_t> ssrcs,
                                MediaStreamTrackInterface* remote_track) {
     auto rtp_receiver = CreateMockRtpReceiver(
         remote_track->kind() == MediaStreamTrackInterface::kAudioKind
             ? MediaType::AUDIO
             : MediaType::VIDEO,
         ssrcs, scoped_refptr<MediaStreamTrackInterface>(remote_track));
     rtp_receivers_.push_back(rtp_receiver);

     if (remote_track->kind() == MediaStreamTrackInterface::kAudioKind) {
       VoiceReceiverInfo voice_receiver_info;
       size_t i = 0;
       for (uint32_t ssrc : ssrcs) {
         voice_receiver_info.local_stats.push_back(SsrcReceiverInfo());
         voice_receiver_info.local_stats[i++].ssrc = ssrc;
       }
       voice_media_info_.receivers.push_back(voice_receiver_info);
     } else {
       VideoReceiverInfo video_receiver_info;
       size_t i = 0;
       for (uint32_t ssrc : ssrcs) {
         video_receiver_info.local_stats.push_back(SsrcReceiverInfo());
         video_receiver_info.local_stats[i++].ssrc = ssrc;
       }
       video_media_info_.receivers.push_back(video_receiver_info);
     }
   }

   // Copies the current state of `voice_media_info_` and `video_media_info_`
   // into the map.
   TrackMediaInfoMap InitializeMap() {
     std::vector<TrackMediaInfoMap::RtpSenderSignalInfo> sender_infos;
     for (const auto& sender : rtp_senders_) {
       sender_infos.push_back({
           .ssrc = sender->ssrc(),
           .attachment_id = sender->AttachmentId(),
           .media_type = sender->media_type(),
       });
     }
     std::vector<TrackMediaInfoMap::RtpReceiverSignalInfo> receiver_infos;
     std::vector<RtpParameters> receiver_params;
     for (const auto& receiver : rtp_receivers_) {
       receiver_infos.push_back({
           .track_id = receiver->track() ? receiver->track()->id() : "",
           .attachment_id = receiver->AttachmentId(),
           .media_type = receiver->media_type(),
       });
       receiver_params.push_back(receiver->GetParameters());
     }
     std::optional<VoiceMediaInfo> voice_media_info;
     if (!voice_media_info_.senders.empty() ||
         !voice_media_info_.receivers.empty()) {
       voice_media_info = voice_media_info_;
     }
     std::optional<VideoMediaInfo> video_media_info;
     if (!video_media_info_.aggregated_senders.empty() ||
         !video_media_info_.receivers.empty()) {
       video_media_info = video_media_info_;
     }
     return TrackMediaInfoMap(std::move(voice_media_info),
                              std::move(video_media_info), sender_infos,
                              receiver_infos, receiver_params);
   }

  private:
   AutoThread main_thread_;
   VoiceMediaInfo voice_media_info_;
   VideoMediaInfo video_media_info_;

  protected:
   std::vector<scoped_refptr<RtpSenderInternal>> rtp_senders_;
   std::vector<scoped_refptr<RtpReceiverInternal>> rtp_receivers_;
   scoped_refptr<AudioTrack> local_audio_track_;
   scoped_refptr<AudioTrack> remote_audio_track_;
   scoped_refptr<VideoTrackInterface> local_video_track_;
   scoped_refptr<VideoTrackInterface> remote_video_track_;
 };

 }  // namespace

 TEST_F(TrackMediaInfoMapTest, SingleSenderReceiverPerTrackWithOneSsrc) {
   AddRtpSenderWithSsrcs({1}, local_audio_track_.get());
   AddRtpReceiverWithSsrcs({2}, remote_audio_track_.get());
   AddRtpSenderWithSsrcs({3}, local_video_track_.get());
   AddRtpReceiverWithSsrcs({4}, remote_video_track_.get());
   TrackMediaInfoMap map = InitializeMap();
   // RTP audio sender -> attachment_id
   EXPECT_EQ(map.GetAttachmentIdBySsrc(1, MediaType::AUDIO, /*is_sender=*/true),
             rtp_senders_[0]->AttachmentId());
   // RTP audio receiver -> track_id
   EXPECT_EQ(map.GetReceiverTrackIdBySsrc(2, MediaType::AUDIO),
             remote_audio_track_->id());
   // RTP video sender -> local video track
   EXPECT_EQ(map.GetAttachmentIdBySsrc(3, MediaType::VIDEO, /*is_sender=*/true),
             rtp_senders_[1]->AttachmentId());
   // RTP video receiver -> remote video track
   EXPECT_EQ(map.GetReceiverTrackIdBySsrc(4, MediaType::VIDEO),
             remote_video_track_->id());
 }

 TEST_F(TrackMediaInfoMapTest,
        SingleSenderReceiverPerTrackWithAudioAndVideoUseSameSsrc) {
   AddRtpSenderWithSsrcs({1}, local_audio_track_.get());
   AddRtpReceiverWithSsrcs({2}, remote_audio_track_.get());
   AddRtpSenderWithSsrcs({1}, local_video_track_.get());
   AddRtpReceiverWithSsrcs({2}, remote_video_track_.get());
   TrackMediaInfoMap map = InitializeMap();
   // RTP audio sender -> attachment_id
   EXPECT_EQ(map.GetAttachmentIdBySsrc(1, MediaType::AUDIO, /*is_sender=*/true),
             rtp_senders_[0]->AttachmentId());
   // RTP audio receiver -> track_id
   EXPECT_EQ(map.GetReceiverTrackIdBySsrc(2, MediaType::AUDIO),
             remote_audio_track_->id());
   // RTP video sender -> local video track
   EXPECT_EQ(map.GetAttachmentIdBySsrc(1, MediaType::VIDEO, /*is_sender=*/true),
             rtp_senders_[1]->AttachmentId());
   // RTP video receiver -> remote video track
   EXPECT_EQ(map.GetReceiverTrackIdBySsrc(2, MediaType::VIDEO),
             remote_video_track_->id());
 }

 TEST_F(TrackMediaInfoMapTest, SingleMultiSsrcSenderPerTrack) {
   AddRtpSenderWithSsrcs({1, 2}, local_audio_track_.get());
   AddRtpSenderWithSsrcs({3, 4}, local_video_track_.get());
   TrackMediaInfoMap map = InitializeMap();
   // RTP audio senders -> attachment_id
   EXPECT_EQ(map.GetAttachmentIdBySsrc(1, MediaType::AUDIO, /*is_sender=*/true),
             rtp_senders_[0]->AttachmentId());
   // RTP video senders -> local video track
   EXPECT_EQ(map.GetAttachmentIdBySsrc(3, MediaType::VIDEO, /*is_sender=*/true),
             rtp_senders_[1]->AttachmentId());
 }

 TEST_F(TrackMediaInfoMapTest, MultipleOneSsrcSendersPerTrack) {
   AddRtpSenderWithSsrcs({1}, local_audio_track_.get());
   AddRtpSenderWithSsrcs({2}, local_audio_track_.get());
   AddRtpSenderWithSsrcs({3}, local_video_track_.get());
   AddRtpSenderWithSsrcs({4}, local_video_track_.get());
   TrackMediaInfoMap map = InitializeMap();
   // RTP audio senders -> attachment_ids
   EXPECT_EQ(map.GetAttachmentIdBySsrc(1, MediaType::AUDIO, /*is_sender=*/true),
             rtp_senders_[0]->AttachmentId());
   EXPECT_EQ(map.GetAttachmentIdBySsrc(2, MediaType::AUDIO, /*is_sender=*/true),
             rtp_senders_[1]->AttachmentId());
   // RTP video senders -> local video track
   EXPECT_EQ(map.GetAttachmentIdBySsrc(3, MediaType::VIDEO, /*is_sender=*/true),
             rtp_senders_[2]->AttachmentId());
   EXPECT_EQ(map.GetAttachmentIdBySsrc(4, MediaType::VIDEO, /*is_sender=*/true),
             rtp_senders_[3]->AttachmentId());
 }

 TEST_F(TrackMediaInfoMapTest, MultipleMultiSsrcSendersPerTrack) {
   AddRtpSenderWithSsrcs({1, 2}, local_audio_track_.get());
   AddRtpSenderWithSsrcs({3, 4}, local_audio_track_.get());
   AddRtpSenderWithSsrcs({5, 6}, local_video_track_.get());
   AddRtpSenderWithSsrcs({7, 8}, local_video_track_.get());
   TrackMediaInfoMap map = InitializeMap();
   // RTP audio senders -> attachment_ids (Primary SSRCs only)
   EXPECT_EQ(map.GetAttachmentIdBySsrc(1, MediaType::AUDIO, /*is_sender=*/true),
             rtp_senders_[0]->AttachmentId());
   EXPECT_EQ(map.GetAttachmentIdBySsrc(3, MediaType::AUDIO, /*is_sender=*/true),
             rtp_senders_[1]->AttachmentId());
   // RTP video senders -> local video track
   EXPECT_EQ(map.GetAttachmentIdBySsrc(5, MediaType::VIDEO, /*is_sender=*/true),
             rtp_senders_[2]->AttachmentId());
   EXPECT_EQ(map.GetAttachmentIdBySsrc(7, MediaType::VIDEO, /*is_sender=*/true),
             rtp_senders_[3]->AttachmentId());
 }

 // SSRCs can be reused for send and receive in loopback.
 TEST_F(TrackMediaInfoMapTest, SingleSenderReceiverPerTrackWithSsrcNotUnique) {
   AddRtpSenderWithSsrcs({1}, local_audio_track_.get());
   AddRtpReceiverWithSsrcs({1}, remote_audio_track_.get());
   AddRtpSenderWithSsrcs({2}, local_video_track_.get());
   AddRtpReceiverWithSsrcs({2}, remote_video_track_.get());
   TrackMediaInfoMap map = InitializeMap();
   // RTP audio senders -> attachment_ids
   EXPECT_EQ(map.GetAttachmentIdBySsrc(1, MediaType::AUDIO, /*is_sender=*/true),
             rtp_senders_[0]->AttachmentId());
   // RTP audio receiver -> track_id
   EXPECT_EQ(map.GetReceiverTrackIdBySsrc(1, MediaType::AUDIO),
             remote_audio_track_->id());
   // RTP video senders -> local video track
   EXPECT_EQ(map.GetAttachmentIdBySsrc(2, MediaType::VIDEO, /*is_sender=*/true),
             rtp_senders_[1]->AttachmentId());
   // RTP video receiver -> remote video track
   EXPECT_EQ(map.GetReceiverTrackIdBySsrc(2, MediaType::VIDEO),
             remote_video_track_->id());
 }

 TEST_F(TrackMediaInfoMapTest, SsrcLookupFunction) {
   AddRtpSenderWithSsrcs({1}, local_audio_track_.get());
   AddRtpReceiverWithSsrcs({2}, remote_audio_track_.get());
   AddRtpSenderWithSsrcs({3}, local_video_track_.get());
   AddRtpReceiverWithSsrcs({4}, remote_video_track_.get());
   TrackMediaInfoMap map = InitializeMap();
   EXPECT_TRUE(map.GetVoiceSenderInfoBySsrc(1));
   EXPECT_TRUE(map.GetVideoSenderInfoBySsrc(3));
   EXPECT_FALSE(map.GetVoiceSenderInfoBySsrc(2));
   EXPECT_FALSE(map.GetVoiceSenderInfoBySsrc(1024));
 }

 TEST_F(TrackMediaInfoMapTest, GetAttachmentIdBySsrc) {
   AddRtpSenderWithSsrcs({1}, local_audio_track_.get());
   AddRtpReceiverWithSsrcs({2}, remote_audio_track_.get());
   TrackMediaInfoMap map = InitializeMap();
   EXPECT_EQ(rtp_senders_[0]->AttachmentId(),
             map.GetAttachmentIdBySsrc(1, MediaType::AUDIO,
                                       /*is_sender=*/true));
   EXPECT_EQ(rtp_receivers_[0]->AttachmentId(),
             map.GetAttachmentIdBySsrc(2, MediaType::AUDIO,
                                       /*is_sender=*/false));
   EXPECT_EQ(std::nullopt, map.GetAttachmentIdBySsrc(3, MediaType::AUDIO,
                                                     /*is_sender=*/true));
 }

 TEST_F(TrackMediaInfoMapTest, GetReceiverTrackIdBySsrc) {
   AddRtpReceiverWithSsrcs({1}, remote_audio_track_.get());
   TrackMediaInfoMap map = InitializeMap();
   EXPECT_EQ(remote_audio_track_->id(),
             map.GetReceiverTrackIdBySsrc(1, MediaType::AUDIO));
   EXPECT_EQ(std::nullopt, map.GetReceiverTrackIdBySsrc(2, MediaType::AUDIO));
 }

 }  // namespace webrtc
	/*
	* Copyright 2016 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 "pc/track_media_info_map.h"

	#include <cstddef>
	#include <cstdint>
	#include <initializer_list>
	#include <optional>
	#include <string>
	#include <utility>
	#include <vector>

	#include "api/make_ref_counted.h"
	#include "api/media_stream_interface.h"
	#include "api/media_types.h"
	#include "api/rtp_parameters.h"
	#include "api/scoped_refptr.h"
	#include "api/test/mock_video_track.h"
	#include "media/base/media_channel.h"
	#include "pc/audio_track.h"
	#include "pc/test/fake_video_track_source.h"
	#include "pc/test/mock_rtp_receiver_internal.h"
	#include "pc/test/mock_rtp_sender_internal.h"
	#include "pc/video_track.h"
	#include "rtc_base/thread.h"
	#include "test/gmock.h"
	#include "test/gtest.h"

	using ::testing::ElementsAre;

	namespace webrtc {

	namespace {

	RtpParameters CreateRtpParametersWithSsrcs(
	std::initializer_list<uint32_t> ssrcs) {
	RtpParameters params;
	for (uint32_t ssrc : ssrcs) {
	RtpEncodingParameters encoding_params;
	encoding_params.ssrc = ssrc;
	params.encodings.push_back(encoding_params);
	}
	return params;
	}

	scoped_refptr<MockRtpSenderInternal> CreateMockRtpSender(
	MediaType media_type,
	std::initializer_list<uint32_t> ssrcs,
	scoped_refptr<MediaStreamTrackInterface> track) {
	uint32_t first_ssrc;
	if (ssrcs.size()) {
	first_ssrc = *ssrcs.begin();
	} else {
	first_ssrc = 0;
	}
	auto sender = make_ref_counted<MockRtpSenderInternal>();
	EXPECT_CALL(*sender, track())
	.WillRepeatedly(::testing::Return(std::move(track)));
	EXPECT_CALL(*sender, ssrc()).WillRepeatedly(::testing::Return(first_ssrc));
	EXPECT_CALL(*sender, media_type())
	.WillRepeatedly(::testing::Return(media_type));
	EXPECT_CALL(*sender, GetParameters())
	.WillRepeatedly(::testing::Return(CreateRtpParametersWithSsrcs(ssrcs)));
	EXPECT_CALL(*sender, AttachmentId()).WillRepeatedly(::testing::Return(1));
	return sender;
	}

	scoped_refptr<MockRtpReceiverInternal> CreateMockRtpReceiver(
	MediaType media_type,
	std::initializer_list<uint32_t> ssrcs,
	scoped_refptr<MediaStreamTrackInterface> track) {
	auto receiver = make_ref_counted<MockRtpReceiverInternal>();
	EXPECT_CALL(*receiver, track())
	.WillRepeatedly(::testing::Return(std::move(track)));
	EXPECT_CALL(*receiver, media_type())
	.WillRepeatedly(::testing::Return(media_type));
	EXPECT_CALL(*receiver, GetParameters())
	.WillRepeatedly(::testing::Return(CreateRtpParametersWithSsrcs(ssrcs)));
	EXPECT_CALL(*receiver, AttachmentId()).WillRepeatedly(::testing::Return(1));
	return receiver;
	}

	scoped_refptr<VideoTrackInterface> CreateVideoTrack(const std::string& id) {
	return VideoTrack::Create(id, FakeVideoTrackSource::Create(false),
	Thread::Current());
	}

	scoped_refptr<VideoTrackInterface> CreateMockVideoTrack(const std::string& id) {
	auto track = MockVideoTrack::Create();
	EXPECT_CALL(*track, kind())
	.WillRepeatedly(::testing::Return(VideoTrack::kVideoKind));
	return track;
	}

	class TrackMediaInfoMapTest : public ::testing::Test {
	public:
	TrackMediaInfoMapTest() : TrackMediaInfoMapTest(true) {}

	explicit TrackMediaInfoMapTest(bool use_real_video_track)
	: local_audio_track_(AudioTrack::Create("LocalAudioTrack", nullptr)),
	remote_audio_track_(AudioTrack::Create("RemoteAudioTrack", nullptr)),
	local_video_track_(use_real_video_track
	? CreateVideoTrack("LocalVideoTrack")
	: CreateMockVideoTrack("LocalVideoTrack")),
	remote_video_track_(use_real_video_track
	? CreateVideoTrack("RemoteVideoTrack")
	: CreateMockVideoTrack("LocalVideoTrack")) {}

	void AddRtpSenderWithSsrcs(std::initializer_list<uint32_t> ssrcs,
	MediaStreamTrackInterface* local_track) {
	scoped_refptr<MockRtpSenderInternal> rtp_sender = CreateMockRtpSender(
	local_track->kind() == MediaStreamTrackInterface::kAudioKind
	? MediaType::AUDIO
	: MediaType::VIDEO,
	ssrcs, scoped_refptr<MediaStreamTrackInterface>(local_track));
	rtp_senders_.push_back(rtp_sender);

	if (local_track->kind() == MediaStreamTrackInterface::kAudioKind) {
	VoiceSenderInfo voice_sender_info;
	size_t i = 0;
	for (uint32_t ssrc : ssrcs) {
	voice_sender_info.local_stats.push_back(SsrcSenderInfo());
	voice_sender_info.local_stats[i++].ssrc = ssrc;
	}
	voice_media_info_.senders.push_back(voice_sender_info);
	} else {
	VideoSenderInfo video_sender_info;
	size_t i = 0;
	for (uint32_t ssrc : ssrcs) {
	video_sender_info.local_stats.push_back(SsrcSenderInfo());
	video_sender_info.local_stats[i++].ssrc = ssrc;
	}
	video_media_info_.senders.push_back(video_sender_info);
	video_media_info_.aggregated_senders.push_back(video_sender_info);
	}
	}

	void AddRtpReceiverWithSsrcs(std::initializer_list<uint32_t> ssrcs,
	MediaStreamTrackInterface* remote_track) {
	auto rtp_receiver = CreateMockRtpReceiver(
	remote_track->kind() == MediaStreamTrackInterface::kAudioKind
	? MediaType::AUDIO
	: MediaType::VIDEO,
	ssrcs, scoped_refptr<MediaStreamTrackInterface>(remote_track));
	rtp_receivers_.push_back(rtp_receiver);

	if (remote_track->kind() == MediaStreamTrackInterface::kAudioKind) {
	VoiceReceiverInfo voice_receiver_info;
	size_t i = 0;
	for (uint32_t ssrc : ssrcs) {
	voice_receiver_info.local_stats.push_back(SsrcReceiverInfo());
	voice_receiver_info.local_stats[i++].ssrc = ssrc;
	}
	voice_media_info_.receivers.push_back(voice_receiver_info);
	} else {
	VideoReceiverInfo video_receiver_info;
	size_t i = 0;
	for (uint32_t ssrc : ssrcs) {
	video_receiver_info.local_stats.push_back(SsrcReceiverInfo());
	video_receiver_info.local_stats[i++].ssrc = ssrc;
	}
	video_media_info_.receivers.push_back(video_receiver_info);
	}
	}

	// Copies the current state of `voice_media_info_` and `video_media_info_`
	// into the map.
	TrackMediaInfoMap InitializeMap() {
	std::vector<TrackMediaInfoMap::RtpSenderSignalInfo> sender_infos;
	for (const auto& sender : rtp_senders_) {
	sender_infos.push_back({
	.ssrc = sender->ssrc(),
	.attachment_id = sender->AttachmentId(),
	.media_type = sender->media_type(),
	});
	}
	std::vector<TrackMediaInfoMap::RtpReceiverSignalInfo> receiver_infos;
	std::vector<RtpParameters> receiver_params;
	for (const auto& receiver : rtp_receivers_) {
	receiver_infos.push_back({
	.track_id = receiver->track() ? receiver->track()->id() : "",
	.attachment_id = receiver->AttachmentId(),
	.media_type = receiver->media_type(),
	});
	receiver_params.push_back(receiver->GetParameters());
	}
	std::optional<VoiceMediaInfo> voice_media_info;
	if (!voice_media_info_.senders.empty() \|\|
	!voice_media_info_.receivers.empty()) {
	voice_media_info = voice_media_info_;
	}
	std::optional<VideoMediaInfo> video_media_info;
	if (!video_media_info_.aggregated_senders.empty() \|\|
	!video_media_info_.receivers.empty()) {
	video_media_info = video_media_info_;
	}
	return TrackMediaInfoMap(std::move(voice_media_info),
	std::move(video_media_info), sender_infos,
	receiver_infos, receiver_params);
	}

	private:
	AutoThread main_thread_;
	VoiceMediaInfo voice_media_info_;
	VideoMediaInfo video_media_info_;

	protected:
	std::vector<scoped_refptr<RtpSenderInternal>> rtp_senders_;
	std::vector<scoped_refptr<RtpReceiverInternal>> rtp_receivers_;
	scoped_refptr<AudioTrack> local_audio_track_;
	scoped_refptr<AudioTrack> remote_audio_track_;
	scoped_refptr<VideoTrackInterface> local_video_track_;
	scoped_refptr<VideoTrackInterface> remote_video_track_;
	};

	} // namespace

	TEST_F(TrackMediaInfoMapTest, SingleSenderReceiverPerTrackWithOneSsrc) {
	AddRtpSenderWithSsrcs({1}, local_audio_track_.get());
	AddRtpReceiverWithSsrcs({2}, remote_audio_track_.get());
	AddRtpSenderWithSsrcs({3}, local_video_track_.get());
	AddRtpReceiverWithSsrcs({4}, remote_video_track_.get());
	TrackMediaInfoMap map = InitializeMap();
	// RTP audio sender -> attachment_id
	EXPECT_EQ(map.GetAttachmentIdBySsrc(1, MediaType::AUDIO, /is_sender=/true),
	rtp_senders_[0]->AttachmentId());
	// RTP audio receiver -> track_id
	EXPECT_EQ(map.GetReceiverTrackIdBySsrc(2, MediaType::AUDIO),
	remote_audio_track_->id());
	// RTP video sender -> local video track
	EXPECT_EQ(map.GetAttachmentIdBySsrc(3, MediaType::VIDEO, /is_sender=/true),
	rtp_senders_[1]->AttachmentId());
	// RTP video receiver -> remote video track
	EXPECT_EQ(map.GetReceiverTrackIdBySsrc(4, MediaType::VIDEO),
	remote_video_track_->id());
	}

	TEST_F(TrackMediaInfoMapTest,
	SingleSenderReceiverPerTrackWithAudioAndVideoUseSameSsrc) {
	AddRtpSenderWithSsrcs({1}, local_audio_track_.get());
	AddRtpReceiverWithSsrcs({2}, remote_audio_track_.get());
	AddRtpSenderWithSsrcs({1}, local_video_track_.get());
	AddRtpReceiverWithSsrcs({2}, remote_video_track_.get());
	TrackMediaInfoMap map = InitializeMap();
	// RTP audio sender -> attachment_id
	EXPECT_EQ(map.GetAttachmentIdBySsrc(1, MediaType::AUDIO, /is_sender=/true),
	rtp_senders_[0]->AttachmentId());
	// RTP audio receiver -> track_id
	EXPECT_EQ(map.GetReceiverTrackIdBySsrc(2, MediaType::AUDIO),
	remote_audio_track_->id());
	// RTP video sender -> local video track
	EXPECT_EQ(map.GetAttachmentIdBySsrc(1, MediaType::VIDEO, /is_sender=/true),
	rtp_senders_[1]->AttachmentId());
	// RTP video receiver -> remote video track
	EXPECT_EQ(map.GetReceiverTrackIdBySsrc(2, MediaType::VIDEO),
	remote_video_track_->id());
	}

	TEST_F(TrackMediaInfoMapTest, SingleMultiSsrcSenderPerTrack) {
	AddRtpSenderWithSsrcs({1, 2}, local_audio_track_.get());
	AddRtpSenderWithSsrcs({3, 4}, local_video_track_.get());
	TrackMediaInfoMap map = InitializeMap();
	// RTP audio senders -> attachment_id
	EXPECT_EQ(map.GetAttachmentIdBySsrc(1, MediaType::AUDIO, /is_sender=/true),
	rtp_senders_[0]->AttachmentId());
	// RTP video senders -> local video track
	EXPECT_EQ(map.GetAttachmentIdBySsrc(3, MediaType::VIDEO, /is_sender=/true),
	rtp_senders_[1]->AttachmentId());
	}

	TEST_F(TrackMediaInfoMapTest, MultipleOneSsrcSendersPerTrack) {
	AddRtpSenderWithSsrcs({1}, local_audio_track_.get());
	AddRtpSenderWithSsrcs({2}, local_audio_track_.get());
	AddRtpSenderWithSsrcs({3}, local_video_track_.get());
	AddRtpSenderWithSsrcs({4}, local_video_track_.get());
	TrackMediaInfoMap map = InitializeMap();
	// RTP audio senders -> attachment_ids
	EXPECT_EQ(map.GetAttachmentIdBySsrc(1, MediaType::AUDIO, /is_sender=/true),
	rtp_senders_[0]->AttachmentId());
	EXPECT_EQ(map.GetAttachmentIdBySsrc(2, MediaType::AUDIO, /is_sender=/true),
	rtp_senders_[1]->AttachmentId());
	// RTP video senders -> local video track
	EXPECT_EQ(map.GetAttachmentIdBySsrc(3, MediaType::VIDEO, /is_sender=/true),
	rtp_senders_[2]->AttachmentId());
	EXPECT_EQ(map.GetAttachmentIdBySsrc(4, MediaType::VIDEO, /is_sender=/true),
	rtp_senders_[3]->AttachmentId());
	}

	TEST_F(TrackMediaInfoMapTest, MultipleMultiSsrcSendersPerTrack) {
	AddRtpSenderWithSsrcs({1, 2}, local_audio_track_.get());
	AddRtpSenderWithSsrcs({3, 4}, local_audio_track_.get());
	AddRtpSenderWithSsrcs({5, 6}, local_video_track_.get());
	AddRtpSenderWithSsrcs({7, 8}, local_video_track_.get());
	TrackMediaInfoMap map = InitializeMap();
	// RTP audio senders -> attachment_ids (Primary SSRCs only)
	EXPECT_EQ(map.GetAttachmentIdBySsrc(1, MediaType::AUDIO, /is_sender=/true),
	rtp_senders_[0]->AttachmentId());
	EXPECT_EQ(map.GetAttachmentIdBySsrc(3, MediaType::AUDIO, /is_sender=/true),
	rtp_senders_[1]->AttachmentId());
	// RTP video senders -> local video track
	EXPECT_EQ(map.GetAttachmentIdBySsrc(5, MediaType::VIDEO, /is_sender=/true),
	rtp_senders_[2]->AttachmentId());
	EXPECT_EQ(map.GetAttachmentIdBySsrc(7, MediaType::VIDEO, /is_sender=/true),
	rtp_senders_[3]->AttachmentId());
	}

	// SSRCs can be reused for send and receive in loopback.
	TEST_F(TrackMediaInfoMapTest, SingleSenderReceiverPerTrackWithSsrcNotUnique) {
	AddRtpSenderWithSsrcs({1}, local_audio_track_.get());
	AddRtpReceiverWithSsrcs({1}, remote_audio_track_.get());
	AddRtpSenderWithSsrcs({2}, local_video_track_.get());
	AddRtpReceiverWithSsrcs({2}, remote_video_track_.get());
	TrackMediaInfoMap map = InitializeMap();
	// RTP audio senders -> attachment_ids
	EXPECT_EQ(map.GetAttachmentIdBySsrc(1, MediaType::AUDIO, /is_sender=/true),
	rtp_senders_[0]->AttachmentId());
	// RTP audio receiver -> track_id
	EXPECT_EQ(map.GetReceiverTrackIdBySsrc(1, MediaType::AUDIO),
	remote_audio_track_->id());
	// RTP video senders -> local video track
	EXPECT_EQ(map.GetAttachmentIdBySsrc(2, MediaType::VIDEO, /is_sender=/true),
	rtp_senders_[1]->AttachmentId());
	// RTP video receiver -> remote video track
	EXPECT_EQ(map.GetReceiverTrackIdBySsrc(2, MediaType::VIDEO),
	remote_video_track_->id());
	}

	TEST_F(TrackMediaInfoMapTest, SsrcLookupFunction) {
	AddRtpSenderWithSsrcs({1}, local_audio_track_.get());
	AddRtpReceiverWithSsrcs({2}, remote_audio_track_.get());
	AddRtpSenderWithSsrcs({3}, local_video_track_.get());
	AddRtpReceiverWithSsrcs({4}, remote_video_track_.get());
	TrackMediaInfoMap map = InitializeMap();
	EXPECT_TRUE(map.GetVoiceSenderInfoBySsrc(1));
	EXPECT_TRUE(map.GetVideoSenderInfoBySsrc(3));
	EXPECT_FALSE(map.GetVoiceSenderInfoBySsrc(2));
	EXPECT_FALSE(map.GetVoiceSenderInfoBySsrc(1024));
	}

	TEST_F(TrackMediaInfoMapTest, GetAttachmentIdBySsrc) {
	AddRtpSenderWithSsrcs({1}, local_audio_track_.get());
	AddRtpReceiverWithSsrcs({2}, remote_audio_track_.get());
	TrackMediaInfoMap map = InitializeMap();
	EXPECT_EQ(rtp_senders_[0]->AttachmentId(),
	map.GetAttachmentIdBySsrc(1, MediaType::AUDIO,
	/is_sender=/true));
	EXPECT_EQ(rtp_receivers_[0]->AttachmentId(),
	map.GetAttachmentIdBySsrc(2, MediaType::AUDIO,
	/is_sender=/false));
	EXPECT_EQ(std::nullopt, map.GetAttachmentIdBySsrc(3, MediaType::AUDIO,
	/is_sender=/true));
	}

	TEST_F(TrackMediaInfoMapTest, GetReceiverTrackIdBySsrc) {
	AddRtpReceiverWithSsrcs({1}, remote_audio_track_.get());
	TrackMediaInfoMap map = InitializeMap();
	EXPECT_EQ(remote_audio_track_->id(),
	map.GetReceiverTrackIdBySsrc(1, MediaType::AUDIO));
	EXPECT_EQ(std::nullopt, map.GetReceiverTrackIdBySsrc(2, MediaType::AUDIO));
	}

	} // namespace webrtc