TrackMediaInfoMap added.

webrtc/api/trackmediainfomap.cc

Index: webrtc/api/trackmediainfomap.cc
diff --git a/webrtc/api/trackmediainfomap.cc b/webrtc/api/trackmediainfomap.cc
new file mode 100644
index 0000000000000000000000000000000000000000..0a22842ec5940303220a841291ea7fd60d03a543
--- /dev/null
+++ b/webrtc/api/trackmediainfomap.cc
@@ -0,0 +1,201 @@
+/*
+ *  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 "webrtc/api/trackmediainfomap.h"
+
+#include <utility>
+
+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(
+    const std::vector<rtc::scoped_refptr<RtpSenderInterface>>& rtp_senders,
+    const std::vector<rtc::scoped_refptr<RtpReceiverInterface>>& rtp_receivers,
+    std::map<uint32_t, AudioTrackInterface*>* audio_track_by_ssrc,
+    std::map<uint32_t, VideoTrackInterface*>* video_track_by_ssrc) {
+  RTC_DCHECK(audio_track_by_ssrc->empty());
+  RTC_DCHECK(video_track_by_ssrc->empty());
+  // TODO(hbos): RTP senders/receivers uses a proxy to the signaling thread, and
+  // our sender/receiver implementations invokes on the worker thread. (This
+  // means one thread jump if on signaling thread and two thread jumps if on any
+  // other threads). Is there a way to avoid thread jump(s) on a per
+  // sender/receiver, per method basis?
+  for (const rtc::scoped_refptr<RtpSenderInterface>& rtp_sender : rtp_senders) {
+    cricket::MediaType media_type = rtp_sender->media_type();
+    MediaStreamTrackInterface* track = rtp_sender->track();
+    if (!track) {
+      continue;
+    }
+    RTC_DCHECK_EQ(track->kind(),
+                  media_type == cricket::MEDIA_TYPE_AUDIO
+                      ? MediaStreamTrackInterface::kAudioKind
+                      : MediaStreamTrackInterface::kVideoKind);
+    // 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(audio_track_by_ssrc->find(ssrc) ==
+                   audio_track_by_ssrc->end());
+        (*audio_track_by_ssrc)[ssrc] = static_cast<AudioTrackInterface*>(track);
+      } else {
+        RTC_DCHECK(video_track_by_ssrc->find(ssrc) ==
+                   video_track_by_ssrc->end());
+        (*video_track_by_ssrc)[ssrc] = static_cast<VideoTrackInterface*>(track);
+      }
+    }
+  }
+  for (const rtc::scoped_refptr<RtpReceiverInterface>& rtp_receiver :
+       rtp_receivers) {
+    cricket::MediaType media_type = rtp_receiver->media_type();
+    MediaStreamTrackInterface* track = rtp_receiver->track();
+    RTC_DCHECK(track);
+    RTC_DCHECK_EQ(track->kind(),
+                  media_type == cricket::MEDIA_TYPE_AUDIO
+                      ? MediaStreamTrackInterface::kAudioKind
+                      : MediaStreamTrackInterface::kVideoKind);
+    RtpParameters params = rtp_receiver->GetParameters();
+    for (const RtpEncodingParameters& encoding : params.encodings) {
+      if (!encoding.ssrc) {
+        continue;
+      }
+      if (media_type == cricket::MEDIA_TYPE_AUDIO) {
+        RTC_DCHECK(audio_track_by_ssrc->find(*encoding.ssrc) ==
+                   audio_track_by_ssrc->end());
+        (*audio_track_by_ssrc)[*encoding.ssrc] =
+            static_cast<AudioTrackInterface*>(track);
+      } else {
+        RTC_DCHECK(video_track_by_ssrc->find(*encoding.ssrc) ==
+                   video_track_by_ssrc->end());
+        (*video_track_by_ssrc)[*encoding.ssrc] =
+            static_cast<VideoTrackInterface*>(track);
+      }
+    }
+  }
+}
+
+}  // namespace
+
+TrackMediaInfoMap::TrackMediaInfoMap(
+    std::unique_ptr<cricket::VoiceMediaInfo> voice_media_info,
+    std::unique_ptr<cricket::VideoMediaInfo> video_media_info,
+    const std::vector<rtc::scoped_refptr<RtpSenderInterface>>& rtp_senders,
+    const std::vector<rtc::scoped_refptr<RtpReceiverInterface>>& rtp_receivers)
+    : voice_media_info_(std::move(voice_media_info)),
+      video_media_info_(std::move(video_media_info)) {
+  std::map<uint32_t, AudioTrackInterface*> audio_track_by_ssrc;
+  std::map<uint32_t, VideoTrackInterface*> video_track_by_ssrc;
+  GetAudioAndVideoTrackBySsrc(
+      rtp_senders, rtp_receivers, &audio_track_by_ssrc, &video_track_by_ssrc);
+  if (voice_media_info_) {
+    for (auto& sender_info : voice_media_info_->senders) {
+      AudioTrackInterface* associated_track =
+          FindValueOrNull(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);
+      }
+    }
+    for (auto& receiver_info : voice_media_info_->receivers) {
+      AudioTrackInterface* associated_track =
+          FindValueOrNull(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;
+      }
+    }
+  }
+  if (video_media_info_) {
+    for (auto& sender_info : video_media_info_->senders) {
+      VideoTrackInterface* associated_track =
+          FindValueOrNull(video_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.
+        video_track_by_sender_info_[&sender_info] = associated_track;
+        video_infos_by_local_track_[associated_track].push_back(&sender_info);
+      }
+    }
+    for (auto& receiver_info : video_media_info_->receivers) {
+      VideoTrackInterface* associated_track =
+          FindValueOrNull(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;
+      }
+    }
+  }
+}
+
+const std::vector<cricket::VoiceSenderInfo*>*
+TrackMediaInfoMap::GetVoiceSenderInfos(
+    const AudioTrackInterface& local_audio_track) const {
+  return FindAddressOrNull(voice_infos_by_local_track_, &local_audio_track);
+}
+
+const cricket::VoiceReceiverInfo* TrackMediaInfoMap::GetVoiceReceiverInfo(
+    const AudioTrackInterface& remote_audio_track) const {
+  return FindValueOrNull(voice_info_by_remote_track_, &remote_audio_track);
+}
+
+const std::vector<cricket::VideoSenderInfo*>*
+TrackMediaInfoMap::GetVideoSenderInfos(
+    const VideoTrackInterface& local_video_track) const {
+  return FindAddressOrNull(video_infos_by_local_track_, &local_video_track);
+}
+
+const cricket::VideoReceiverInfo* TrackMediaInfoMap::GetVideoReceiverInfo(
+    const VideoTrackInterface& remote_video_track) const {
+  return FindValueOrNull(video_info_by_remote_track_, &remote_video_track);
+}
+
+rtc::scoped_refptr<AudioTrackInterface> TrackMediaInfoMap::GetAudioTrack(
+    const cricket::VoiceSenderInfo& voice_sender_info) const {
+  return FindValueOrNull(audio_track_by_sender_info_, &voice_sender_info);
+}
+
+rtc::scoped_refptr<AudioTrackInterface> TrackMediaInfoMap::GetAudioTrack(
+    const cricket::VoiceReceiverInfo& voice_receiver_info) const {
+  return FindValueOrNull(audio_track_by_receiver_info_, &voice_receiver_info);
+}
+
+rtc::scoped_refptr<VideoTrackInterface> TrackMediaInfoMap::GetVideoTrack(
+    const cricket::VideoSenderInfo& video_sender_info) const {
+  return FindValueOrNull(video_track_by_sender_info_, &video_sender_info);
+}
+
+rtc::scoped_refptr<VideoTrackInterface> TrackMediaInfoMap::GetVideoTrack(
+    const cricket::VideoReceiverInfo& video_receiver_info) const {
+  return FindValueOrNull(video_track_by_receiver_info_, &video_receiver_info);
+}
+
+}  // namespace webrtc