pc/track_media_info_map.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 <cstdint>
 #include <set>
 #include <type_traits>
 #include <utility>

 #include "api/media_types.h"
 #include "api/rtp_parameters.h"
 #include "media/base/stream_params.h"
 #include "rtc_base/checks.h"
 #include "rtc_base/thread.h"

 namespace webrtc {

 namespace {

 template <typename K, typename V>
 V FindValueOrNull(const std::map<K, V>& map, const K& key) {
   auto it = map.find(key);
   return (it != map.end()) ? it->second : nullptr;
 }

 template <typename K, typename V>
 const V* FindAddressOrNull(const std::map<K, V>& map, const K& key) {
   auto it = map.find(key);
   return (it != map.end()) ? &it->second : nullptr;
 }

 void GetAudioAndVideoTrackBySsrc(
     rtc::ArrayView<rtc::scoped_refptr<RtpSenderInternal>> rtp_senders,
     rtc::ArrayView<rtc::scoped_refptr<RtpReceiverInternal>> rtp_receivers,
     std::map<uint32_t, AudioTrackInterface*>* local_audio_track_by_ssrc,
     std::map<uint32_t, VideoTrackInterface*>* local_video_track_by_ssrc,
     std::map<uint32_t, AudioTrackInterface*>* remote_audio_track_by_ssrc,
     std::map<uint32_t, VideoTrackInterface*>* remote_video_track_by_ssrc,
     AudioTrackInterface** unsignaled_audio_track,
     VideoTrackInterface** unsignaled_video_track) {
   RTC_DCHECK(local_audio_track_by_ssrc->empty());
   RTC_DCHECK(local_video_track_by_ssrc->empty());
   RTC_DCHECK(remote_audio_track_by_ssrc->empty());
   RTC_DCHECK(remote_video_track_by_ssrc->empty());
   for (const auto& rtp_sender : rtp_senders) {
     cricket::MediaType media_type = rtp_sender->media_type();
     MediaStreamTrackInterface* track = rtp_sender->track().get();
     if (!track) {
       continue;
     }
     // TODO(deadbeef): `ssrc` should be removed in favor of `GetParameters`.
     uint32_t ssrc = rtp_sender->ssrc();
     if (ssrc != 0) {
       if (media_type == cricket::MEDIA_TYPE_AUDIO) {
         RTC_DCHECK(local_audio_track_by_ssrc->find(ssrc) ==
                    local_audio_track_by_ssrc->end());
         (*local_audio_track_by_ssrc)[ssrc] =
             static_cast<AudioTrackInterface*>(track);
       } else {
         RTC_DCHECK(local_video_track_by_ssrc->find(ssrc) ==
                    local_video_track_by_ssrc->end());
         (*local_video_track_by_ssrc)[ssrc] =
             static_cast<VideoTrackInterface*>(track);
       }
     }
   }
   for (const auto& rtp_receiver : rtp_receivers) {
     cricket::MediaType media_type = rtp_receiver->media_type();
     MediaStreamTrackInterface* track = rtp_receiver->track().get();
     RTC_DCHECK(track);
     RtpParameters params = rtp_receiver->GetParameters();
     for (const RtpEncodingParameters& encoding : params.encodings) {
       if (!encoding.ssrc) {
         if (media_type == cricket::MEDIA_TYPE_AUDIO) {
           *unsignaled_audio_track = static_cast<AudioTrackInterface*>(track);
         } else {
           RTC_DCHECK(media_type == cricket::MEDIA_TYPE_VIDEO);
           *unsignaled_video_track = static_cast<VideoTrackInterface*>(track);
         }
         continue;
       }
       if (media_type == cricket::MEDIA_TYPE_AUDIO) {
         RTC_DCHECK(remote_audio_track_by_ssrc->find(*encoding.ssrc) ==
                    remote_audio_track_by_ssrc->end());
         (*remote_audio_track_by_ssrc)[*encoding.ssrc] =
             static_cast<AudioTrackInterface*>(track);
       } else {
         RTC_DCHECK(remote_video_track_by_ssrc->find(*encoding.ssrc) ==
                    remote_video_track_by_ssrc->end());
         (*remote_video_track_by_ssrc)[*encoding.ssrc] =
             static_cast<VideoTrackInterface*>(track);
       }
     }
   }
 }

 }  // namespace

 TrackMediaInfoMap::TrackMediaInfoMap() = default;

 void TrackMediaInfoMap::Initialize(
     absl::optional<cricket::VoiceMediaInfo> voice_media_info,
     absl::optional<cricket::VideoMediaInfo> video_media_info,
     rtc::ArrayView<rtc::scoped_refptr<RtpSenderInternal>> rtp_senders,
     rtc::ArrayView<rtc::scoped_refptr<RtpReceiverInternal>> rtp_receivers) {
   rtc::Thread::ScopedDisallowBlockingCalls no_blocking_calls;
   RTC_DCHECK(!is_initialized_);
   is_initialized_ = true;
   voice_media_info_ = std::move(voice_media_info);
   video_media_info_ = std::move(video_media_info);

   std::map<uint32_t, AudioTrackInterface*> local_audio_track_by_ssrc;
   std::map<uint32_t, VideoTrackInterface*> local_video_track_by_ssrc;
   std::map<uint32_t, AudioTrackInterface*> remote_audio_track_by_ssrc;
   std::map<uint32_t, VideoTrackInterface*> remote_video_track_by_ssrc;
   AudioTrackInterface* unsignaled_audio_track = nullptr;
   VideoTrackInterface* unsignaled_video_track = nullptr;
   GetAudioAndVideoTrackBySsrc(
       rtp_senders, rtp_receivers, &local_audio_track_by_ssrc,
       &local_video_track_by_ssrc, &remote_audio_track_by_ssrc,
       &remote_video_track_by_ssrc, &unsignaled_audio_track,
       &unsignaled_video_track);

   for (const auto& sender : rtp_senders) {
     attachment_id_by_track_[sender->track().get()] = sender->AttachmentId();
   }
   for (const auto& receiver : rtp_receivers) {
     attachment_id_by_track_[receiver->track().get()] = receiver->AttachmentId();
   }

   if (voice_media_info_.has_value()) {
     for (auto& sender_info : voice_media_info_->senders) {
       AudioTrackInterface* associated_track =
           FindValueOrNull(local_audio_track_by_ssrc, sender_info.ssrc());
       if (associated_track) {
         // One sender is associated with at most one track.
         // One track may be associated with multiple senders.
         audio_track_by_sender_info_[&sender_info] = associated_track;
         voice_infos_by_local_track_[associated_track].push_back(&sender_info);
       }
       if (sender_info.ssrc() == 0)
         continue;  // Unconnected SSRC. bugs.webrtc.org/8673
       RTC_CHECK(voice_info_by_sender_ssrc_.count(sender_info.ssrc()) == 0)
           << "Duplicate voice sender SSRC: " << sender_info.ssrc();
       voice_info_by_sender_ssrc_[sender_info.ssrc()] = &sender_info;
     }
     for (auto& receiver_info : voice_media_info_->receivers) {
       AudioTrackInterface* associated_track =
           FindValueOrNull(remote_audio_track_by_ssrc, receiver_info.ssrc());
       if (associated_track) {
         // One receiver is associated with at most one track, which is uniquely
         // associated with that receiver.
         audio_track_by_receiver_info_[&receiver_info] = associated_track;
         RTC_DCHECK(voice_info_by_remote_track_.find(associated_track) ==
                    voice_info_by_remote_track_.end());
         voice_info_by_remote_track_[associated_track] = &receiver_info;
       } else if (unsignaled_audio_track) {
         audio_track_by_receiver_info_[&receiver_info] = unsignaled_audio_track;
         voice_info_by_remote_track_[unsignaled_audio_track] = &receiver_info;
       }
       RTC_CHECK(voice_info_by_receiver_ssrc_.count(receiver_info.ssrc()) == 0)
           << "Duplicate voice receiver SSRC: " << receiver_info.ssrc();
       voice_info_by_receiver_ssrc_[receiver_info.ssrc()] = &receiver_info;
     }
   }
   if (video_media_info_.has_value()) {
     for (auto& sender_info : video_media_info_->senders) {
       std::set<uint32_t> ssrcs;
       ssrcs.insert(sender_info.ssrc());
       for (auto& ssrc_group : sender_info.ssrc_groups) {
         for (auto ssrc : ssrc_group.ssrcs) {
           ssrcs.insert(ssrc);
         }
       }
       for (auto ssrc : ssrcs) {
         VideoTrackInterface* associated_track =
             FindValueOrNull(local_video_track_by_ssrc, ssrc);
         if (associated_track) {
           // One sender is associated with at most one track.
           // One track may be associated with multiple senders.
           video_track_by_sender_info_[&sender_info] = associated_track;
           video_infos_by_local_track_[associated_track].push_back(&sender_info);
           break;
         }
       }
     }
     for (auto& sender_info : video_media_info_->aggregated_senders) {
       if (sender_info.ssrc() == 0)
         continue;  // Unconnected SSRC. bugs.webrtc.org/8673
       RTC_DCHECK(video_info_by_sender_ssrc_.count(sender_info.ssrc()) == 0)
           << "Duplicate video sender SSRC: " << sender_info.ssrc();
       video_info_by_sender_ssrc_[sender_info.ssrc()] = &sender_info;
       VideoTrackInterface* associated_track =
           FindValueOrNull(local_video_track_by_ssrc, sender_info.ssrc());
       if (associated_track) {
         video_track_by_sender_info_[&sender_info] = associated_track;
       }
     }
     for (auto& receiver_info : video_media_info_->receivers) {
       VideoTrackInterface* associated_track =
           FindValueOrNull(remote_video_track_by_ssrc, receiver_info.ssrc());
       if (associated_track) {
         // One receiver is associated with at most one track, which is uniquely
         // associated with that receiver.
         video_track_by_receiver_info_[&receiver_info] = associated_track;
         RTC_DCHECK(video_info_by_remote_track_.find(associated_track) ==
                    video_info_by_remote_track_.end());
         video_info_by_remote_track_[associated_track] = &receiver_info;
       } else if (unsignaled_video_track) {
         video_track_by_receiver_info_[&receiver_info] = unsignaled_video_track;
         video_info_by_remote_track_[unsignaled_video_track] = &receiver_info;
       }
       RTC_DCHECK(video_info_by_receiver_ssrc_.count(receiver_info.ssrc()) == 0)
           << "Duplicate video receiver SSRC: " << receiver_info.ssrc();
       video_info_by_receiver_ssrc_[receiver_info.ssrc()] = &receiver_info;
     }
   }
 }

 const std::vector<cricket::VoiceSenderInfo*>*
 TrackMediaInfoMap::GetVoiceSenderInfos(
     const AudioTrackInterface& local_audio_track) const {
   RTC_DCHECK(is_initialized_);
   return FindAddressOrNull(voice_infos_by_local_track_, &local_audio_track);
 }

 const cricket::VoiceReceiverInfo* TrackMediaInfoMap::GetVoiceReceiverInfo(
     const AudioTrackInterface& remote_audio_track) const {
   RTC_DCHECK(is_initialized_);
   return FindValueOrNull(voice_info_by_remote_track_, &remote_audio_track);
 }

 const std::vector<cricket::VideoSenderInfo*>*
 TrackMediaInfoMap::GetVideoSenderInfos(
     const VideoTrackInterface& local_video_track) const {
   RTC_DCHECK(is_initialized_);
   return FindAddressOrNull(video_infos_by_local_track_, &local_video_track);
 }

 const cricket::VideoReceiverInfo* TrackMediaInfoMap::GetVideoReceiverInfo(
     const VideoTrackInterface& remote_video_track) const {
   RTC_DCHECK(is_initialized_);
   return FindValueOrNull(video_info_by_remote_track_, &remote_video_track);
 }

 const cricket::VoiceSenderInfo* TrackMediaInfoMap::GetVoiceSenderInfoBySsrc(
     uint32_t ssrc) const {
   RTC_DCHECK(is_initialized_);
   return FindValueOrNull(voice_info_by_sender_ssrc_, ssrc);
 }
 const cricket::VoiceReceiverInfo* TrackMediaInfoMap::GetVoiceReceiverInfoBySsrc(
     uint32_t ssrc) const {
   RTC_DCHECK(is_initialized_);
   return FindValueOrNull(voice_info_by_receiver_ssrc_, ssrc);
 }

 const cricket::VideoSenderInfo* TrackMediaInfoMap::GetVideoSenderInfoBySsrc(
     uint32_t ssrc) const {
   RTC_DCHECK(is_initialized_);
   return FindValueOrNull(video_info_by_sender_ssrc_, ssrc);
 }

 const cricket::VideoReceiverInfo* TrackMediaInfoMap::GetVideoReceiverInfoBySsrc(
     uint32_t ssrc) const {
   RTC_DCHECK(is_initialized_);
   return FindValueOrNull(video_info_by_receiver_ssrc_, ssrc);
 }

 rtc::scoped_refptr<AudioTrackInterface> TrackMediaInfoMap::GetAudioTrack(
     const cricket::VoiceSenderInfo& voice_sender_info) const {
   RTC_DCHECK(is_initialized_);
   return FindValueOrNull(audio_track_by_sender_info_, &voice_sender_info);
 }

 rtc::scoped_refptr<AudioTrackInterface> TrackMediaInfoMap::GetAudioTrack(
     const cricket::VoiceReceiverInfo& voice_receiver_info) const {
   RTC_DCHECK(is_initialized_);
   return FindValueOrNull(audio_track_by_receiver_info_, &voice_receiver_info);
 }

 rtc::scoped_refptr<VideoTrackInterface> TrackMediaInfoMap::GetVideoTrack(
     const cricket::VideoSenderInfo& video_sender_info) const {
   RTC_DCHECK(is_initialized_);
   return FindValueOrNull(video_track_by_sender_info_, &video_sender_info);
 }

 rtc::scoped_refptr<VideoTrackInterface> TrackMediaInfoMap::GetVideoTrack(
     const cricket::VideoReceiverInfo& video_receiver_info) const {
   RTC_DCHECK(is_initialized_);
   return FindValueOrNull(video_track_by_receiver_info_, &video_receiver_info);
 }

 absl::optional<int> TrackMediaInfoMap::GetAttachmentIdByTrack(
     const MediaStreamTrackInterface* track) const {
   RTC_DCHECK(is_initialized_);
   auto it = attachment_id_by_track_.find(track);
   return it != attachment_id_by_track_.end() ? absl::optional<int>(it->second)
                                              : absl::nullopt;
 }

 }  // 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 <cstdint>
	#include <set>
	#include <type_traits>
	#include <utility>

	#include "api/media_types.h"
	#include "api/rtp_parameters.h"
	#include "media/base/stream_params.h"
	#include "rtc_base/checks.h"
	#include "rtc_base/thread.h"

	namespace webrtc {

	namespace {

	template <typename K, typename V>
	V FindValueOrNull(const std::map<K, V>& map, const K& key) {
	auto it = map.find(key);
	return (it != map.end()) ? it->second : nullptr;
	}

	template <typename K, typename V>
	const V* FindAddressOrNull(const std::map<K, V>& map, const K& key) {
	auto it = map.find(key);
	return (it != map.end()) ? &it->second : nullptr;
	}

	void GetAudioAndVideoTrackBySsrc(
	rtc::ArrayView<rtc::scoped_refptr<RtpSenderInternal>> rtp_senders,
	rtc::ArrayView<rtc::scoped_refptr<RtpReceiverInternal>> rtp_receivers,
	std::map<uint32_t, AudioTrackInterface> local_audio_track_by_ssrc,
	std::map<uint32_t, VideoTrackInterface> local_video_track_by_ssrc,
	std::map<uint32_t, AudioTrackInterface> remote_audio_track_by_ssrc,
	std::map<uint32_t, VideoTrackInterface> remote_video_track_by_ssrc,
	AudioTrackInterface** unsignaled_audio_track,
	VideoTrackInterface** unsignaled_video_track) {
	RTC_DCHECK(local_audio_track_by_ssrc->empty());
	RTC_DCHECK(local_video_track_by_ssrc->empty());
	RTC_DCHECK(remote_audio_track_by_ssrc->empty());
	RTC_DCHECK(remote_video_track_by_ssrc->empty());
	for (const auto& rtp_sender : rtp_senders) {
	cricket::MediaType media_type = rtp_sender->media_type();
	MediaStreamTrackInterface* track = rtp_sender->track().get();
	if (!track) {
	continue;
	}
	// TODO(deadbeef): `ssrc` should be removed in favor of `GetParameters`.
	uint32_t ssrc = rtp_sender->ssrc();
	if (ssrc != 0) {
	if (media_type == cricket::MEDIA_TYPE_AUDIO) {
	RTC_DCHECK(local_audio_track_by_ssrc->find(ssrc) ==
	local_audio_track_by_ssrc->end());
	(*local_audio_track_by_ssrc)[ssrc] =
	static_cast<AudioTrackInterface*>(track);
	} else {
	RTC_DCHECK(local_video_track_by_ssrc->find(ssrc) ==
	local_video_track_by_ssrc->end());
	(*local_video_track_by_ssrc)[ssrc] =
	static_cast<VideoTrackInterface*>(track);
	}
	}
	}
	for (const auto& rtp_receiver : rtp_receivers) {
	cricket::MediaType media_type = rtp_receiver->media_type();
	MediaStreamTrackInterface* track = rtp_receiver->track().get();
	RTC_DCHECK(track);
	RtpParameters params = rtp_receiver->GetParameters();
	for (const RtpEncodingParameters& encoding : params.encodings) {
	if (!encoding.ssrc) {
	if (media_type == cricket::MEDIA_TYPE_AUDIO) {
	unsignaled_audio_track = static_cast<AudioTrackInterface>(track);
	} else {
	RTC_DCHECK(media_type == cricket::MEDIA_TYPE_VIDEO);
	unsignaled_video_track = static_cast<VideoTrackInterface>(track);
	}
	continue;
	}
	if (media_type == cricket::MEDIA_TYPE_AUDIO) {
	RTC_DCHECK(remote_audio_track_by_ssrc->find(*encoding.ssrc) ==
	remote_audio_track_by_ssrc->end());
	(remote_audio_track_by_ssrc)[encoding.ssrc] =
	static_cast<AudioTrackInterface*>(track);
	} else {
	RTC_DCHECK(remote_video_track_by_ssrc->find(*encoding.ssrc) ==
	remote_video_track_by_ssrc->end());
	(remote_video_track_by_ssrc)[encoding.ssrc] =
	static_cast<VideoTrackInterface*>(track);
	}
	}
	}
	}

	} // namespace

	TrackMediaInfoMap::TrackMediaInfoMap() = default;

	void TrackMediaInfoMap::Initialize(
	absl::optional<cricket::VoiceMediaInfo> voice_media_info,
	absl::optional<cricket::VideoMediaInfo> video_media_info,
	rtc::ArrayView<rtc::scoped_refptr<RtpSenderInternal>> rtp_senders,
	rtc::ArrayView<rtc::scoped_refptr<RtpReceiverInternal>> rtp_receivers) {
	rtc::Thread::ScopedDisallowBlockingCalls no_blocking_calls;
	RTC_DCHECK(!is_initialized_);
	is_initialized_ = true;
	voice_media_info_ = std::move(voice_media_info);
	video_media_info_ = std::move(video_media_info);

	std::map<uint32_t, AudioTrackInterface*> local_audio_track_by_ssrc;
	std::map<uint32_t, VideoTrackInterface*> local_video_track_by_ssrc;
	std::map<uint32_t, AudioTrackInterface*> remote_audio_track_by_ssrc;
	std::map<uint32_t, VideoTrackInterface*> remote_video_track_by_ssrc;
	AudioTrackInterface* unsignaled_audio_track = nullptr;
	VideoTrackInterface* unsignaled_video_track = nullptr;
	GetAudioAndVideoTrackBySsrc(
	rtp_senders, rtp_receivers, &local_audio_track_by_ssrc,
	&local_video_track_by_ssrc, &remote_audio_track_by_ssrc,
	&remote_video_track_by_ssrc, &unsignaled_audio_track,
	&unsignaled_video_track);

	for (const auto& sender : rtp_senders) {
	attachment_id_by_track_[sender->track().get()] = sender->AttachmentId();
	}
	for (const auto& receiver : rtp_receivers) {
	attachment_id_by_track_[receiver->track().get()] = receiver->AttachmentId();
	}

	if (voice_media_info_.has_value()) {
	for (auto& sender_info : voice_media_info_->senders) {
	AudioTrackInterface* associated_track =
	FindValueOrNull(local_audio_track_by_ssrc, sender_info.ssrc());
	if (associated_track) {
	// One sender is associated with at most one track.
	// One track may be associated with multiple senders.
	audio_track_by_sender_info_[&sender_info] = associated_track;
	voice_infos_by_local_track_[associated_track].push_back(&sender_info);
	}
	if (sender_info.ssrc() == 0)
	continue; // Unconnected SSRC. bugs.webrtc.org/8673
	RTC_CHECK(voice_info_by_sender_ssrc_.count(sender_info.ssrc()) == 0)
	<< "Duplicate voice sender SSRC: " << sender_info.ssrc();
	voice_info_by_sender_ssrc_[sender_info.ssrc()] = &sender_info;
	}
	for (auto& receiver_info : voice_media_info_->receivers) {
	AudioTrackInterface* associated_track =
	FindValueOrNull(remote_audio_track_by_ssrc, receiver_info.ssrc());
	if (associated_track) {
	// One receiver is associated with at most one track, which is uniquely
	// associated with that receiver.
	audio_track_by_receiver_info_[&receiver_info] = associated_track;
	RTC_DCHECK(voice_info_by_remote_track_.find(associated_track) ==
	voice_info_by_remote_track_.end());
	voice_info_by_remote_track_[associated_track] = &receiver_info;
	} else if (unsignaled_audio_track) {
	audio_track_by_receiver_info_[&receiver_info] = unsignaled_audio_track;
	voice_info_by_remote_track_[unsignaled_audio_track] = &receiver_info;
	}
	RTC_CHECK(voice_info_by_receiver_ssrc_.count(receiver_info.ssrc()) == 0)
	<< "Duplicate voice receiver SSRC: " << receiver_info.ssrc();
	voice_info_by_receiver_ssrc_[receiver_info.ssrc()] = &receiver_info;
	}
	}
	if (video_media_info_.has_value()) {
	for (auto& sender_info : video_media_info_->senders) {
	std::set<uint32_t> ssrcs;
	ssrcs.insert(sender_info.ssrc());
	for (auto& ssrc_group : sender_info.ssrc_groups) {
	for (auto ssrc : ssrc_group.ssrcs) {
	ssrcs.insert(ssrc);
	}
	}
	for (auto ssrc : ssrcs) {
	VideoTrackInterface* associated_track =
	FindValueOrNull(local_video_track_by_ssrc, ssrc);
	if (associated_track) {
	// One sender is associated with at most one track.
	// One track may be associated with multiple senders.
	video_track_by_sender_info_[&sender_info] = associated_track;
	video_infos_by_local_track_[associated_track].push_back(&sender_info);
	break;
	}
	}
	}
	for (auto& sender_info : video_media_info_->aggregated_senders) {
	if (sender_info.ssrc() == 0)
	continue; // Unconnected SSRC. bugs.webrtc.org/8673
	RTC_DCHECK(video_info_by_sender_ssrc_.count(sender_info.ssrc()) == 0)
	<< "Duplicate video sender SSRC: " << sender_info.ssrc();
	video_info_by_sender_ssrc_[sender_info.ssrc()] = &sender_info;
	VideoTrackInterface* associated_track =
	FindValueOrNull(local_video_track_by_ssrc, sender_info.ssrc());
	if (associated_track) {
	video_track_by_sender_info_[&sender_info] = associated_track;
	}
	}
	for (auto& receiver_info : video_media_info_->receivers) {
	VideoTrackInterface* associated_track =
	FindValueOrNull(remote_video_track_by_ssrc, receiver_info.ssrc());
	if (associated_track) {
	// One receiver is associated with at most one track, which is uniquely
	// associated with that receiver.
	video_track_by_receiver_info_[&receiver_info] = associated_track;
	RTC_DCHECK(video_info_by_remote_track_.find(associated_track) ==
	video_info_by_remote_track_.end());
	video_info_by_remote_track_[associated_track] = &receiver_info;
	} else if (unsignaled_video_track) {
	video_track_by_receiver_info_[&receiver_info] = unsignaled_video_track;
	video_info_by_remote_track_[unsignaled_video_track] = &receiver_info;
	}
	RTC_DCHECK(video_info_by_receiver_ssrc_.count(receiver_info.ssrc()) == 0)
	<< "Duplicate video receiver SSRC: " << receiver_info.ssrc();
	video_info_by_receiver_ssrc_[receiver_info.ssrc()] = &receiver_info;
	}
	}
	}

	const std::vector<cricket::VoiceSenderInfo>
	TrackMediaInfoMap::GetVoiceSenderInfos(
	const AudioTrackInterface& local_audio_track) const {
	RTC_DCHECK(is_initialized_);
	return FindAddressOrNull(voice_infos_by_local_track_, &local_audio_track);
	}

	const cricket::VoiceReceiverInfo* TrackMediaInfoMap::GetVoiceReceiverInfo(
	const AudioTrackInterface& remote_audio_track) const {
	RTC_DCHECK(is_initialized_);
	return FindValueOrNull(voice_info_by_remote_track_, &remote_audio_track);
	}

	const std::vector<cricket::VideoSenderInfo>
	TrackMediaInfoMap::GetVideoSenderInfos(
	const VideoTrackInterface& local_video_track) const {
	RTC_DCHECK(is_initialized_);
	return FindAddressOrNull(video_infos_by_local_track_, &local_video_track);
	}

	const cricket::VideoReceiverInfo* TrackMediaInfoMap::GetVideoReceiverInfo(
	const VideoTrackInterface& remote_video_track) const {
	RTC_DCHECK(is_initialized_);
	return FindValueOrNull(video_info_by_remote_track_, &remote_video_track);
	}

	const cricket::VoiceSenderInfo* TrackMediaInfoMap::GetVoiceSenderInfoBySsrc(
	uint32_t ssrc) const {
	RTC_DCHECK(is_initialized_);
	return FindValueOrNull(voice_info_by_sender_ssrc_, ssrc);
	}
	const cricket::VoiceReceiverInfo* TrackMediaInfoMap::GetVoiceReceiverInfoBySsrc(
	uint32_t ssrc) const {
	RTC_DCHECK(is_initialized_);
	return FindValueOrNull(voice_info_by_receiver_ssrc_, ssrc);
	}

	const cricket::VideoSenderInfo* TrackMediaInfoMap::GetVideoSenderInfoBySsrc(
	uint32_t ssrc) const {
	RTC_DCHECK(is_initialized_);
	return FindValueOrNull(video_info_by_sender_ssrc_, ssrc);
	}

	const cricket::VideoReceiverInfo* TrackMediaInfoMap::GetVideoReceiverInfoBySsrc(
	uint32_t ssrc) const {
	RTC_DCHECK(is_initialized_);
	return FindValueOrNull(video_info_by_receiver_ssrc_, ssrc);
	}

	rtc::scoped_refptr<AudioTrackInterface> TrackMediaInfoMap::GetAudioTrack(
	const cricket::VoiceSenderInfo& voice_sender_info) const {
	RTC_DCHECK(is_initialized_);
	return FindValueOrNull(audio_track_by_sender_info_, &voice_sender_info);
	}

	rtc::scoped_refptr<AudioTrackInterface> TrackMediaInfoMap::GetAudioTrack(
	const cricket::VoiceReceiverInfo& voice_receiver_info) const {
	RTC_DCHECK(is_initialized_);
	return FindValueOrNull(audio_track_by_receiver_info_, &voice_receiver_info);
	}

	rtc::scoped_refptr<VideoTrackInterface> TrackMediaInfoMap::GetVideoTrack(
	const cricket::VideoSenderInfo& video_sender_info) const {
	RTC_DCHECK(is_initialized_);
	return FindValueOrNull(video_track_by_sender_info_, &video_sender_info);
	}

	rtc::scoped_refptr<VideoTrackInterface> TrackMediaInfoMap::GetVideoTrack(
	const cricket::VideoReceiverInfo& video_receiver_info) const {
	RTC_DCHECK(is_initialized_);
	return FindValueOrNull(video_track_by_receiver_info_, &video_receiver_info);
	}

	absl::optional<int> TrackMediaInfoMap::GetAttachmentIdByTrack(
	const MediaStreamTrackInterface* track) const {
	RTC_DCHECK(is_initialized_);
	auto it = attachment_id_by_track_.find(track);
	return it != attachment_id_by_track_.end() ? absl::optional<int>(it->second)
	: absl::nullopt;
	}

	} // namespace webrtc