Reland of Make cricket::VideoCapturer implement VideoSourceInterface (patchset #14 id:30000…

webrtc/media/base/videobroadcaster.h

Index: webrtc/media/base/videobroadcaster.h
diff --git a/webrtc/media/base/videobroadcaster.h b/webrtc/media/base/videobroadcaster.h
index f0009c92ace228f9be10b1c7a3d9a8152e3405ab..63c22730c7f1df7d7316a682dcf2b22990e8eb2d 100644
--- a/webrtc/media/base/videobroadcaster.h
+++ b/webrtc/media/base/videobroadcaster.h
@@ -11,6 +11,50 @@
 #ifndef WEBRTC_MEDIA_BASE_VIDEOBROADCASTER_H_
 #define WEBRTC_MEDIA_BASE_VIDEOBROADCASTER_H_
 
-// TODO(perkj): Implement.
+#include <utility>
+#include <vector>
+
+#include "webrtc/base/thread_checker.h"
+#include "webrtc/media/base/videoframe.h"
+#include "webrtc/media/base/videosinkinterface.h"
+#include "webrtc/media/base/videosourceinterface.h"
+
+namespace rtc {
+
+class VideoBroadcaster : public VideoSourceInterface<cricket::VideoFrame>,
+                         public VideoSinkInterface<cricket::VideoFrame> {
+ public:
+  VideoBroadcaster();
+  void AddOrUpdateSink(VideoSinkInterface<cricket::VideoFrame>* sink,
+                       const VideoSinkWants& wants) override;
+  void RemoveSink(VideoSinkInterface<cricket::VideoFrame>* sink) override;
+
+  // Returns true if the next frame will be delivered to at least one sink.
+  bool frame_wanted() const;
+
+  // Returns VideoSinkWants a source is requested to fulfill. They are
+  // aggregated by all VideoSinkWants from all sinks.
+  VideoSinkWants wants() const;
+
+  void OnFrame(const cricket::VideoFrame& frame) override;
+
+ protected:
+  struct SinkPair {
+    SinkPair(VideoSinkInterface<cricket::VideoFrame>* sink,
+             VideoSinkWants wants)
+        : sink(sink), wants(wants) {}
+    VideoSinkInterface<cricket::VideoFrame>* sink;
+    VideoSinkWants wants;
+  };
+  SinkPair* FindSinkPair(const VideoSinkInterface<cricket::VideoFrame>* sink);
+
+  ThreadChecker thread_checker_;
+
+  VideoSinkWants current_wants_;
+
+  std::vector<SinkPair> sinks_;
+};
+
+}  // namespace rtc
 
 #endif  // WEBRTC_MEDIA_BASE_VIDEOBROADCASTER_H_