Extract VideoCaptureDeviceFactory out of VideoCaptureDevice and use for File and FakeVCD.

content/browser/renderer_host/media/video_capture_manager.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.
 
 // VideoCaptureManager is used to open/close, start/stop, enumerate available
 // video capture devices, and manage VideoCaptureController's.
 // All functions are expected to be called from Browser::IO thread. Some helper
 // functions (*OnDeviceThread) will dispatch operations to the device thread.
 // VideoCaptureManager will open OS dependent instances of VideoCaptureDevice.
 // A device can only be opened once.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_MANAGER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_MANAGER_H_
 
 #include <map>
 #include <set>
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/process/process_handle.h"
 #include "content/browser/renderer_host/media/media_stream_provider.h"
 #include "content/browser/renderer_host/media/video_capture_controller_event_handler.h"
 #include "content/common/content_export.h"
 #include "content/common/media/media_stream_options.h"
 #include "media/video/capture/video_capture_device.h"
+#include "media/video/capture/video_capture_device_factory.h"
 #include "media/video/capture/video_capture_types.h"
 
 namespace content {
 class VideoCaptureController;
 class VideoCaptureControllerEventHandler;
 
 // VideoCaptureManager opens/closes and start/stops video capture devices.
 class CONTENT_EXPORT VideoCaptureManager : public MediaStreamProvider {
  public:
   // Callback used to signal the completion of a controller lookup.
   typedef base::Callback<
       void(const base::WeakPtr<VideoCaptureController>&)> DoneCB;
 
-  VideoCaptureManager();
+  explicit VideoCaptureManager(
+      scoped_ptr<media::VideoCaptureDeviceFactory> factory);
 
   // Implements MediaStreamProvider.
   virtual void Register(MediaStreamProviderListener* listener,
                         const scoped_refptr<base::SingleThreadTaskRunner>&
                             device_task_runner) OVERRIDE;
 
   virtual void Unregister() OVERRIDE;
 
   virtual void EnumerateDevices(MediaStreamType stream_type) OVERRIDE;
 
   virtual int Open(const StreamDeviceInfo& device) OVERRIDE;
 
   virtual void Close(int capture_session_id) OVERRIDE;
 
-  // Used by unit test to make sure a fake device is used instead of a real
-  // video capture device. Due to timing requirements, the function must be
-  // called before EnumerateDevices and Open.
-  void UseFakeDevice();
+  // Used by unit tests to pass a fake device factory. Due to timing
+  // requirements, the function must be called before EnumerateDevices and Open.
+  void UseFakeDevice(scoped_ptr<media::VideoCaptureDeviceFactory> factory);
 
   // Called by VideoCaptureHost to locate a capture device for |capture_params|,
   // adding the Host as a client of the device's controller if successful. The
   // value of |session_id| controls which device is selected;
   // this value should be a session id previously returned by Open().
   //
   // If the device is not already started (i.e., no other client is currently
   // capturing from this device), this call will cause a VideoCaptureController
   // and VideoCaptureDevice to be created, possibly asynchronously.
   //
@@ skipping 27 matching lines @@
   // |capture_session_id| is not found. Returns true and |formats_in_use|
   // otherwise. |formats_in_use| is empty if the device is not in use.
   bool GetDeviceFormatsInUse(media::VideoCaptureSessionId capture_session_id,
                              media::VideoCaptureFormats* formats_in_use);
 
   // Sets the platform-dependent window ID for the desktop capture notification
   // UI for the given session.
   void SetDesktopCaptureWindowId(media::VideoCaptureSessionId session_id,
                                  gfx::NativeViewId window_id);
 
+  // Gets a weak reference to the device factory, used for tests.
+  media::VideoCaptureDeviceFactory* video_capture_device_factory() const {
+    return video_capture_device_factory_.get();
+  }
+
  private:
   virtual ~VideoCaptureManager();
   struct DeviceEntry;
 
   // This data structure is a convenient wrap of a devices' name and associated
   // video capture supported formats.
   struct DeviceInfo {
     DeviceInfo();
     DeviceInfo(const media::VideoCaptureDevice::Name& name,
                const media::VideoCaptureFormats& supported_formats);
@@ skipping 97 matching lines @@
 
     // The controller. Only used from the IO thread.
     scoped_ptr<VideoCaptureController> video_capture_controller;
 
     // The capture device. Only used from the device thread.
     scoped_ptr<media::VideoCaptureDevice> video_capture_device;
   };
   typedef std::set<DeviceEntry*> DeviceEntries;
   DeviceEntries devices_;
 
+  // Device creation factory injected from Media Stream Manager or from the test
+  // harness. Supported fake devices include a simple fake device (a rolling
+  // pacman), or a file that is played in a loop continuously. Test device is
+  // only and always of type MEDIA_DEVICE_VIDEO_CAPTURE.
+  scoped_ptr<media::VideoCaptureDeviceFactory> video_capture_device_factory_;
+
   // Local cache of the enumerated video capture devices' names and capture
   // supported formats. A snapshot of the current devices and their capabilities
   // is composed in GetAvailableDevicesInfoOnDeviceThread() --coming
   // from EnumerateDevices()--, and this snapshot is used to update this list in
   // OnDevicesInfoEnumerated(). GetDeviceSupportedFormats() will
   // use this list if the device is not started, otherwise it will retrieve the
   // active device capture format from the VideoCaptureController associated.
   DeviceInfos devices_info_cache_;
 
-  // For unit testing and for performance/quality tests, a test device can be
-  // used instead of a real one. The device can be a simple fake device (a
-  // rolling pacman), or a file that is played in a loop continuously. This only
-  // applies to the MEDIA_DEVICE_VIDEO_CAPTURE device type.
-  enum {
-    DISABLED,
-    TEST_PATTERN,
-    Y4M_FILE
-  } artificial_device_source_for_testing_;
-
   // Accessed on the device thread only.
   std::map<media::VideoCaptureSessionId, gfx::NativeViewId>
       notification_window_ids_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_MANAGER_H_