Wip - cl for implemening VideoTrackSource::ApplyConstraints(constraints, VideoTrack) and adopt safe…

content/renderer/media/media_stream_video_track.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_TRACK_H_
 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_TRACK_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/threading/thread_checker.h"
 #include "content/common/content_export.h"
 #include "content/public/renderer/media_stream_video_sink.h"
 #include "content/renderer/media/media_stream_track.h"
 #include "content/renderer/media/media_stream_video_source.h"
 #include "content/renderer/media/secure_display_link_tracker.h"
 
 namespace content {
 
 // MediaStreamVideoTrack is a video specific representation of a
 // blink::WebMediaStreamTrack in content. It is owned by the blink object
 // and can be retrieved from a blink object using
 // WebMediaStreamTrack::getExtraData() or MediaStreamVideoTrack::GetVideoTrack.
 class CONTENT_EXPORT MediaStreamVideoTrack : public MediaStreamTrack {
  public:
-  // Help method to create a blink::WebMediaStreamTrack and a
+  // Help method to create a blink::WebMediaStreamTrack and register to |source|
+  // to receive video frames.
   // MediaStreamVideoTrack instance. The MediaStreamVideoTrack object is owned
   // by the blink object in its WebMediaStreamTrack::ExtraData member.
-  // |callback| is triggered if the track is added to the source
-  // successfully and will receive video frames that match |constraints|
-  // or if the source fail to provide video frames.
-  // If |enabled| is true, sinks added to the track will
-  // receive video frames when the source deliver frames to the track.
-  static blink::WebMediaStreamTrack CreateVideoTrack(
-      MediaStreamVideoSource* source,
-      const blink::WebMediaConstraints& constraints,
-      const MediaStreamVideoSource::ConstraintsCallback& callback,
-      bool enabled);
+  static blink::WebMediaStreamTrack
+    CreateVideoTrack(MediaStreamVideoSource* source);
+
+  static void InitializeVideoTrack(MediaStreamVideoSource* source,
+                                   const blink::WebMediaStreamTrack& track);
 
   static MediaStreamVideoTrack* GetVideoTrack(
       const blink::WebMediaStreamTrack& track);
 
-  // Constructor for video tracks.
-  MediaStreamVideoTrack(
-      MediaStreamVideoSource* source,
-      const blink::WebMediaConstraints& constraints,
-      const MediaStreamVideoSource::ConstraintsCallback& callback,
-      bool enabled);
   ~MediaStreamVideoTrack() override;
 
   // MediaStreamTrack overrides.
   void SetEnabled(bool enabled) override;
   void Stop() override;
   void getSettings(blink::WebMediaStreamTrack::Settings& settings) override;
 
   void OnReadyStateChanged(blink::WebMediaStreamSource::ReadyState state);
 
   const blink::WebMediaConstraints& constraints() const { return constraints_; }
 
+  VideoCaptureDeliverFrameCB frame_input() const;
+
+ protected:
+  friend class MediaStreamVideoSource;
+  // Constructor for video tracks.
+  MediaStreamVideoTrack(base::WeakPtr<MediaStreamVideoSource> source,
+                        bool enabled);
  private:
   // MediaStreamVideoSink is a friend to allow it to call AddSink() and
-  // RemoveSink().
+  // RemoveSink() and to create MediaStreamVideoTracks.
   friend class MediaStreamVideoSink;
   FRIEND_TEST_ALL_PREFIXES(MediaStreamRemoteVideoSourceTest, StartTrack);
   FRIEND_TEST_ALL_PREFIXES(MediaStreamRemoteVideoSourceTest, RemoteTrackStop);
   FRIEND_TEST_ALL_PREFIXES(PepperToVideoTrackAdapterTest, PutFrame);
 
   // Add |sink| to receive state changes on the main render thread and video
   // frames in the |callback| method on the IO-thread.
   // |callback| will be reset on the render thread.
   // These two methods are private such that no subclass can intercept and
   // store the callback. This is important to ensure that we can release
@@ skipping 17 matching lines @@
 
   // This is used for tracking if all connected video sinks are secure.
   SecureDisplayLinkTracker<MediaStreamVideoSink> secure_tracker_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoTrack);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_TRACK_H_