Create //webrtc/api:libjingle_peerconnection_api + refactorings.

webrtc/api/mediastreamobserver.cc

-/*
- *  Copyright 2015 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/mediastreamobserver.h"
-
-#include <algorithm>
-
-namespace webrtc {
-
-MediaStreamObserver::MediaStreamObserver(MediaStreamInterface* stream)
-    : stream_(stream),
-      cached_audio_tracks_(stream->GetAudioTracks()),
-      cached_video_tracks_(stream->GetVideoTracks()) {
-  stream_->RegisterObserver(this);
-}
-
-MediaStreamObserver::~MediaStreamObserver() {
-  stream_->UnregisterObserver(this);
-}
-
-void MediaStreamObserver::OnChanged() {
-  AudioTrackVector new_audio_tracks = stream_->GetAudioTracks();
-  VideoTrackVector new_video_tracks = stream_->GetVideoTracks();
-
-  // Find removed audio tracks.
-  for (const auto& cached_track : cached_audio_tracks_) {
-    auto it = std::find_if(
-        new_audio_tracks.begin(), new_audio_tracks.end(),
-        [cached_track](const AudioTrackVector::value_type& new_track) {
-          return new_track->id().compare(cached_track->id()) == 0;
-        });
-    if (it == new_audio_tracks.end()) {
-      SignalAudioTrackRemoved(cached_track.get(), stream_);
-    }
-  }
-
-  // Find added audio tracks.
-  for (const auto& new_track : new_audio_tracks) {
-    auto it = std::find_if(
-        cached_audio_tracks_.begin(), cached_audio_tracks_.end(),
-        [new_track](const AudioTrackVector::value_type& cached_track) {
-          return new_track->id().compare(cached_track->id()) == 0;
-        });
-    if (it == cached_audio_tracks_.end()) {
-      SignalAudioTrackAdded(new_track.get(), stream_);
-    }
-  }
-
-  // Find removed video tracks.
-  for (const auto& cached_track : cached_video_tracks_) {
-    auto it = std::find_if(
-        new_video_tracks.begin(), new_video_tracks.end(),
-        [cached_track](const VideoTrackVector::value_type& new_track) {
-          return new_track->id().compare(cached_track->id()) == 0;
-        });
-    if (it == new_video_tracks.end()) {
-      SignalVideoTrackRemoved(cached_track.get(), stream_);
-    }
-  }
-
-  // Find added video tracks.
-  for (const auto& new_track : new_video_tracks) {
-    auto it = std::find_if(
-        cached_video_tracks_.begin(), cached_video_tracks_.end(),
-        [new_track](const VideoTrackVector::value_type& cached_track) {
-          return new_track->id().compare(cached_track->id()) == 0;
-        });
-    if (it == cached_video_tracks_.end()) {
-      SignalVideoTrackAdded(new_track.get(), stream_);
-    }
-  }
-
-  cached_audio_tracks_ = new_audio_tracks;
-  cached_video_tracks_ = new_video_tracks;
-}
-
-}  // namespace webrtc