Move ContentVideoCaptureDeviceCore from src/content to src/media

media/capture/thread_safe_capture_oracle.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_THREAD_SAFE_CAPTURE_ORACLE_H_
+#define MEDIA_CAPTURE_THREAD_SAFE_CAPTURE_ORACLE_H_
 
 #include <string>
 
+#include "base/memory/ref_counted.h"
 #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/media_export.h"
 #include "media/base/video_frame.h"
+#include "media/capture/capture_resolution_chooser.h"
+#include "media/capture/video_capture_oracle.h"
 #include "media/video/capture/video_capture_device.h"
 
 namespace media {
+
 struct VideoCaptureParams;
 class VideoFrame;
-}  // namespace media
-
-namespace content {
-
-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
+class MEDIA_EXPORT ThreadSafeCaptureOracle
     : public base::RefCountedThreadSafe<ThreadSafeCaptureOracle> {
  public:
-  ThreadSafeCaptureOracle(scoped_ptr<media::VideoCaptureDevice::Client> client,
-                          const media::VideoCaptureParams& params);
+  ThreadSafeCaptureOracle(scoped_ptr<VideoCaptureDevice::Client> client,
+                          const 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,
+  typedef base::Callback<void(const scoped_refptr<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,
+                                    scoped_refptr<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;
   }
 
@@ skipping 10 matching lines @@
   // 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,
+      scoped_ptr<VideoCaptureDevice::Client::Buffer> buffer,
       base::TimeTicks capture_begin_time,
       base::TimeDelta estimated_frame_duration,
-      const scoped_refptr<media::VideoFrame>& frame,
+      const scoped_refptr<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_;
+  scoped_ptr<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_;
+  const 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.
-class VideoCaptureMachine {
- public:
-  VideoCaptureMachine() {}
-  virtual ~VideoCaptureMachine() {}
+}  // namespace media
 
-  // 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;
-
-  // Stops capturing. Must be run on the UI BrowserThread.
-  // |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
-// (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> {
- public:
-  ContentVideoCaptureDeviceCore(
-      scoped_ptr<VideoCaptureMachine> capture_machine);
-  virtual ~ContentVideoCaptureDeviceCore();
-
-  // Asynchronous requests to change ContentVideoCaptureDeviceCore state.
-  void AllocateAndStart(const media::VideoCaptureParams& params,
-                        scoped_ptr<media::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.
-  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);
-};
-
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_MEDIA_CAPTURE_CONTENT_VIDEO_CAPTURE_DEVICE_CORE_H_
+#endif  // MEDIA_CAPTURE_THREAD_SAFE_CAPTURE_ORACLE_H_