Define the interface for MediaStreamVideoSource.

content/renderer/media/media_stream_video_source.h

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_SOURCE_H_
+#define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_SOURCE_H_
+
+#include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+#include "content/common/content_export.h"
+#include "content/renderer/media/media_stream_source_extra_data.h"
+#include "third_party/WebKit/public/platform/WebMediaConstraints.h"
+#include "third_party/WebKit/public/platform/WebMediaStreamSource.h"
+#include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
+
+namespace media {
+class VideoFrame;
+}
+
+namespace content {
+
+// MediaStreamVideoSource is an interface used for sending video frames to a
+// MediaStreamVideoTrack.
+// http://dev.w3.org/2011/webrtc/editor/getusermedia.html
+// All methods calls will be done from the main render thread.
+class CONTENT_EXPORT MediaStreamVideoSource
+    : public MediaStreamSourceExtraData {
+ public:
+  // Puts |track| in the registered tracks list. Will later
+  // deliver frames to it according to |constraints|.
+  void AddTrack(const blink::WebMediaStreamTrack& track,
+                const blink::WebMediaConstraints& constraints);
+
+  // Removes |track| from the registered tracks list, i.e. will stop delivering
+  // frame to |track|.
+  void RemoveTrack(const blink::WebMediaStreamTrack& track);
+
+ protected:
+  // Sets ready state and notifies the ready state to all registered tracks.
+  virtual void SetReadyState(blink::WebMediaStreamSource::ReadyState state);
+
+  // Delivers |frame| to registered tracks according to their constraints.
+  virtual void DeliverVideoFrame(const scoped_refptr<media::VideoFrame>& frame);
+
+  virtual ~MediaStreamVideoSource();
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_SOURCE_H_