Move ContentVideoCaptureDeviceCore from src/content to src/media

media/capture/screen_capture_device_core.h

 // Copyright 2014 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_BROWSER_MEDIA_CAPTURE_CONTENT_VIDEO_CAPTURE_DEVICE_CORE_H_
-#define CONTENT_BROWSER_MEDIA_CAPTURE_CONTENT_VIDEO_CAPTURE_DEVICE_CORE_H_
+#ifndef MEDIA_CAPTURE_SCREEN_CAPTURE_DEVICE_CORE_H_
+#define MEDIA_CAPTURE_SCREEN_CAPTURE_DEVICE_CORE_H_
 
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
-#include "base/threading/thread.h"
 #include "base/threading/thread_checker.h"
-#include "content/browser/media/capture/capture_resolution_chooser.h"
-#include "content/browser/media/capture/video_capture_oracle.h"
-#include "content/common/content_export.h"
-#include "media/base/video_frame.h"
+#include "media/base/media_export.h"
+#include "media/capture/thread_safe_capture_oracle.h"
 #include "media/video/capture/video_capture_device.h"
 
 namespace media {
+
 struct VideoCaptureParams;
-class VideoFrame;
-}  // namespace media
 
-namespace content {
+class ThreadSafeCaptureOracle;
 
-class VideoCaptureMachine;
-
-// Thread-safe, refcounted proxy to the VideoCaptureOracle.  This proxy wraps
-// the VideoCaptureOracle, which decides which frames to capture, and a
-// VideoCaptureDevice::Client, which allocates and receives the captured
-// frames, in a lock to synchronize state between the two.
-class ThreadSafeCaptureOracle
-    : public base::RefCountedThreadSafe<ThreadSafeCaptureOracle> {
- public:
-  ThreadSafeCaptureOracle(scoped_ptr<media::VideoCaptureDevice::Client> client,
-                          const media::VideoCaptureParams& params);
-
-  // Called when a captured frame is available or an error has occurred.
-  // If |success| is true then |frame| is valid and |timestamp| indicates when
-  // the frame was painted.
-  // If |success| is false, all other parameters are invalid.
-  typedef base::Callback<void(const scoped_refptr<media::VideoFrame>& frame,
-                              base::TimeTicks timestamp,
-                              bool success)> CaptureFrameCallback;
-
-  bool ObserveEventAndDecideCapture(VideoCaptureOracle::Event event,
-                                    const gfx::Rect& damage_rect,
-                                    base::TimeTicks event_time,
-                                    scoped_refptr<media::VideoFrame>* storage,
-                                    CaptureFrameCallback* callback);
-
-  base::TimeDelta min_capture_period() const {
-    return oracle_.min_capture_period();
-  }
-
-  gfx::Size max_frame_size() const {
-    return params_.requested_format.frame_size;
-  }
-
-  // Returns the current capture resolution.
-  gfx::Size GetCaptureSize() const;
-
-  // Updates capture resolution based on the supplied source size and the
-  // maximum frame size.
-  void UpdateCaptureSize(const gfx::Size& source_size);
-
-  // Stop new captures from happening (but doesn't forget the client).
-  void Stop();
-
-  // Signal an error to the client.
-  void ReportError(const std::string& reason);
-
- private:
-  friend class base::RefCountedThreadSafe<ThreadSafeCaptureOracle>;
-  virtual ~ThreadSafeCaptureOracle();
-
-  // Callback invoked on completion of all captures.
-  void DidCaptureFrame(
-      int frame_number,
-      scoped_ptr<media::VideoCaptureDevice::Client::Buffer> buffer,
-      base::TimeTicks capture_begin_time,
-      base::TimeDelta estimated_frame_duration,
-      const scoped_refptr<media::VideoFrame>& frame,
-      base::TimeTicks timestamp,
-      bool success);
-
-  // Callback invoked once all consumers have finished with a delivered video
-  // frame.  Consumer feedback signals are scanned from the frame's |metadata|.
-  void DidConsumeFrame(int frame_number,
-                       const media::VideoFrameMetadata* metadata);
-
-  // Protects everything below it.
-  mutable base::Lock lock_;
-
-  // Recipient of our capture activity.
-  scoped_ptr<media::VideoCaptureDevice::Client> client_;
-
-  // Makes the decision to capture a frame.
-  VideoCaptureOracle oracle_;
-
-  // The video capture parameters used to construct the oracle proxy.
-  const media::VideoCaptureParams params_;
-
-  // Determines video capture frame sizes.
-  CaptureResolutionChooser resolution_chooser_;
-};
-
-// Keeps track of the video capture source frames and executes copying on the
-// UI BrowserThread.
+// Keeps track of the video capture source frames and executes copying.
 class VideoCaptureMachine {
  public:
   VideoCaptureMachine() {}
   virtual ~VideoCaptureMachine() {}
 
-  // Starts capturing. Returns true if succeeded.
-  // Must be run on the UI BrowserThread.
-  virtual bool Start(const scoped_refptr<ThreadSafeCaptureOracle>& oracle_proxy,
-                     const media::VideoCaptureParams& params) = 0;
+  // Starts capturing.
+  // |callback| is invoked with true if succeeded. Otherwise, with false.
+  virtual void Start(const scoped_refptr<ThreadSafeCaptureOracle>& oracle_proxy,
+                     const VideoCaptureParams& params,
+                     const base::Callback<void(bool)> callback) = 0;
 
-  // Stops capturing. Must be run on the UI BrowserThread.
+  // Stops capturing.
   // |callback| is invoked after the capturing has stopped.
   virtual void Stop(const base::Closure& callback) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureMachine);
 };
 
 // The "meat" of a content video capturer.
 //
 // Separating this from the "shell classes" WebContentsVideoCaptureDevice and
 // DesktopCaptureDeviceAura allows safe destruction without needing to block any
 // threads, as well as code sharing.
 //
-// ContentVideoCaptureDeviceCore manages a simple state machine and the pipeline
+// ScreenCaptureDeviceCore manages a simple state machine and the pipeline
 // (see notes at top of this file).  It times the start of successive captures
 // and facilitates the processing of each through the stages of the
 // pipeline.
-class CONTENT_EXPORT ContentVideoCaptureDeviceCore
-    : public base::SupportsWeakPtr<ContentVideoCaptureDeviceCore> {
+class MEDIA_EXPORT ScreenCaptureDeviceCore
+    : public base::SupportsWeakPtr<ScreenCaptureDeviceCore> {
  public:
-  ContentVideoCaptureDeviceCore(
+  ScreenCaptureDeviceCore(
       scoped_ptr<VideoCaptureMachine> capture_machine);
-  virtual ~ContentVideoCaptureDeviceCore();
+  virtual ~ScreenCaptureDeviceCore();
 
-  // Asynchronous requests to change ContentVideoCaptureDeviceCore state.
-  void AllocateAndStart(const media::VideoCaptureParams& params,
-                        scoped_ptr<media::VideoCaptureDevice::Client> client);
+  // Asynchronous requests to change ScreenCaptureDeviceCore state.
+  void AllocateAndStart(const VideoCaptureParams& params,
+                        scoped_ptr<VideoCaptureDevice::Client> client);
   void StopAndDeAllocate();
 
  private:
   // Flag indicating current state.
   enum State {
     kIdle,
     kCapturing,
     kError
   };
 
   void TransitionStateTo(State next_state);
 
   // Called back in response to StartCaptureMachine().  |success| is true if
   // capture machine succeeded to start.
   void CaptureStarted(bool success);
 
   // Stops capturing and notifies client_ of an error state.
   void Error(const std::string& reason);
 
   // Tracks that all activity occurs on the media stream manager's thread.
   base::ThreadChecker thread_checker_;
 
   // Current lifecycle state.
   State state_;
 
-  // Tracks the CaptureMachine that's doing work on our behalf on the UI thread.
-  // This value should never be dereferenced by this class, other than to
-  // create and destroy it on the UI thread.
+  // Tracks the CaptureMachine that's doing work on our behalf
+  // on the device thread or UI thread.
+  // This value should never be dereferenced by this class.
   scoped_ptr<VideoCaptureMachine> capture_machine_;
 
   // Our thread-safe capture oracle which serves as the gateway to the video
   // capture pipeline. Besides the VideoCaptureDevice itself, it is the only
   // component of the system with direct access to |client_|.
   scoped_refptr<ThreadSafeCaptureOracle> oracle_proxy_;
 
-  DISALLOW_COPY_AND_ASSIGN(ContentVideoCaptureDeviceCore);
+  DISALLOW_COPY_AND_ASSIGN(ScreenCaptureDeviceCore);
 };
 
 
-}  // namespace content
+}  // namespace media
 
-#endif  // CONTENT_BROWSER_MEDIA_CAPTURE_CONTENT_VIDEO_CAPTURE_DEVICE_CORE_H_
+#endif  // MEDIA_CAPTURE_SCREEN_CAPTURE_DEVICE_CORE_H_