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/*
* 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;
}
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;
} else if (unsignaled_audio_track) {
audio_track_by_receiver_info_[&receiver_info] = unsignaled_audio_track;
}
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;
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;
} else if (unsignaled_video_track) {
video_track_by_receiver_info_[&receiver_info] = unsignaled_video_track;
}
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 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