Index: talk/app/webrtc/mediastreamobserver.cc |
diff --git a/talk/app/webrtc/mediastreamobserver.cc b/talk/app/webrtc/mediastreamobserver.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..56a79cdc7c75bc564d935b6f87b1c918ae28096f |
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+++ b/talk/app/webrtc/mediastreamobserver.cc |
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+/* |
+ * libjingle |
+ * Copyright 2015 Google Inc. |
+ * |
+ * Redistribution and use in source and binary forms, with or without |
+ * modification, are permitted provided that the following conditions are met: |
+ * |
+ * 1. Redistributions of source code must retain the above copyright notice, |
+ * this list of conditions and the following disclaimer. |
+ * 2. Redistributions in binary form must reproduce the above copyright notice, |
+ * this list of conditions and the following disclaimer in the documentation |
+ * and/or other materials provided with the distribution. |
+ * 3. The name of the author may not be used to endorse or promote products |
+ * derived from this software without specific prior written permission. |
+ * |
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
+ */ |
+ |
+#include "talk/app/webrtc/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) -> bool { |
+ 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) -> bool { |
+ 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) -> bool { |
+ 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) -> bool { |
+ 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 |