Making DesktopEnvironment a factory class used by ClientSession to create audio/video capturers and…

remoting/host/video_scheduler.h

 // Copyright (c) 2012 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 REMOTING_HOST_VIDEO_SCHEDULER_H_
 #define REMOTING_HOST_VIDEO_SCHEDULER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
-#include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time.h"
 #include "base/timer.h"
 #include "remoting/capturer/video_frame_capturer.h"
 #include "remoting/codec/video_encoder.h"
 #include "remoting/host/capture_scheduler.h"
 #include "remoting/proto/video.pb.h"
+#include "third_party/skia/include/core/SkSize.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }  // namespace base
 
 namespace remoting {
 
 class CaptureData;
 class CursorShapeInfo;
 class VideoFrameCapturer;
@@ skipping 39 matching lines @@
 // of the capture, encode and network processes.  However, it also needs to
 // rate-limit captures to avoid overloading the host system, either by consuming
 // too much CPU, or hogging the host's graphics subsystem.
 
 class VideoScheduler : public base::RefCountedThreadSafe<VideoScheduler>,
                        public VideoFrameCapturer::Delegate {
  public:
   // Creates a VideoScheduler running capture, encode and network tasks on the
   // supplied TaskRunners.  Video and cursor shape updates will be pumped to
   // |video_stub| and |client_stub|, which must remain valid until Stop() is
-  // called. |capturer| is used to capture frames and must remain valid until
-  // the |done_task| supplied to Stop() is executed.
+  // called. |capturer| is used to capture frames.
   static scoped_refptr<VideoScheduler> Create(
       scoped_refptr<base::SingleThreadTaskRunner> capture_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> encode_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> network_task_runner,
-      VideoFrameCapturer* capturer,
+      scoped_ptr<VideoFrameCapturer> capturer,
       scoped_ptr<VideoEncoder> encoder,
       protocol::CursorShapeStub* cursor_stub,
       protocol::VideoStub* video_stub);
 
   // VideoFrameCapturer::Delegate implementation.
   virtual void OnCaptureCompleted(
       scoped_refptr<CaptureData> capture_data) OVERRIDE;
   virtual void OnCursorShapeChanged(
       scoped_ptr<MouseCursorShape> cursor_shape) OVERRIDE;
 
-  // Stop scheduling frame captures.  |done_task| is executed on the network
-  // thread when capturing has stopped.  This object cannot be re-used once
+  // Stop scheduling frame captures. This object cannot be re-used once
   // it has been stopped.
-  void Stop(const base::Closure& done_task);
+  void Stop();
 
   // Pauses or resumes scheduling of frame captures.  Pausing/resuming captures
   // only affects capture scheduling and does not stop/start the capturer.
   void Pause(bool pause);
 
   // Updates the sequence number embedded in VideoPackets.
   // Sequence numbers are used for performance measurements.
   void UpdateSequenceNumber(int64 sequence_number);
 
  private:
   friend class base::RefCountedThreadSafe<VideoScheduler>;
 
   VideoScheduler(
       scoped_refptr<base::SingleThreadTaskRunner> capture_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> encode_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> network_task_runner,
-      VideoFrameCapturer* capturer,
+      scoped_ptr<VideoFrameCapturer> capturer,
       scoped_ptr<VideoEncoder> encoder,
       protocol::CursorShapeStub* cursor_stub,
       protocol::VideoStub* video_stub);
   virtual ~VideoScheduler();
 
   // Capturer thread ----------------------------------------------------------
 
   // Starts the capturer on the capture thread.
   void StartOnCaptureThread();
 
   // Stops scheduling frame captures on the capture thread, and posts
-  // |done_task| to the network thread when done.
-  void StopOnCaptureThread(const base::Closure& done_task);
+  // StopOnEncodeThread() to the network thread when done.
+  void StopOnCaptureThread();
 
   // Schedules the next call to CaptureNextFrame.
   void ScheduleNextCapture();
 
   // Starts the next frame capture, unless there are already too many pending.
   void CaptureNextFrame();
 
   // Called when a frame capture has been encoded & sent to the client.
   void FrameCaptureCompleted();
 
   // Network thread -----------------------------------------------------------
 
   // Send |packet| to the client, unless we are in the process of stopping.
   void SendVideoPacket(scoped_ptr<VideoPacket> packet);
 
   // Callback passed to |video_stub_| for the last packet in each frame, to
   // rate-limit frame captures to network throughput.
   void VideoFrameSentCallback();
 
   // Send updated cursor shape to client.
   void SendCursorShape(scoped_ptr<protocol::CursorShapeInfo> cursor_shape);
 
+  // Posted to the network thread to delete |capturer| on the thread that
+  // created it.
+  void StopOnNetworkThread(scoped_ptr<VideoFrameCapturer> capturer);
+
   // Encoder thread -----------------------------------------------------------
 
   // Encode a frame, passing generated VideoPackets to SendVideoPacket().
   void EncodeFrame(scoped_refptr<CaptureData> capture_data);
 
   void EncodedDataAvailableCallback(scoped_ptr<VideoPacket> packet);
 
   // Used to synchronize capture and encode thread teardown, notifying the
   // network thread when done.
-  void StopOnEncodeThread(const base::Closure& done_task);
+  void StopOnEncodeThread(scoped_ptr<VideoFrameCapturer> capturer);
 
   // Task runners used by this class.
   scoped_refptr<base::SingleThreadTaskRunner> capture_task_runner_;
   scoped_refptr<base::SingleThreadTaskRunner> encode_task_runner_;
   scoped_refptr<base::SingleThreadTaskRunner> network_task_runner_;
 
   // Used to capture frames. Always accessed on the capture thread.
-  VideoFrameCapturer* capturer_;
+  scoped_ptr<VideoFrameCapturer> capturer_;
 
   // Used to encode captured frames. Always accessed on the encode thread.
   scoped_ptr<VideoEncoder> encoder_;
 
   // Interfaces through which video frames and cursor shapes are passed to the
   // client. These members are always accessed on the network thread.
   protocol::CursorShapeStub* cursor_stub_;
   protocol::VideoStub* video_stub_;
 
   // Timer used to schedule CaptureNextFrame().
@@ skipping 13 matching lines @@
 
   // An object to schedule capturing.
   CaptureScheduler scheduler_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoScheduler);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_VIDEO_SCHEDULER_H_