VideoCaptureDeviceWin: Extract class-static method into a Factory (both MF/DS)

media/video/capture/win/video_capture_device_mf_win.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.
 
 // Windows specific implementation of VideoCaptureDevice.
 // DirectShow is used for capturing. DirectShow provide its own threads
 // for capturing.
 
 #ifndef MEDIA_VIDEO_CAPTURE_WIN_VIDEO_CAPTURE_DEVICE_MF_WIN_H_
 #define MEDIA_VIDEO_CAPTURE_WIN_VIDEO_CAPTURE_DEVICE_MF_WIN_H_
@@ skipping 12 matching lines @@
 interface IMFSourceReader;
 
 namespace media {
 
 class MFReaderCallback;
 
 class MEDIA_EXPORT VideoCaptureDeviceMFWin
     : public base::NonThreadSafe,
       public VideoCaptureDevice {
  public:
+  static bool FormatFromGuid(const GUID& guid, VideoPixelFormat* format);
+
   explicit VideoCaptureDeviceMFWin(const Name& device_name);
   virtual ~VideoCaptureDeviceMFWin();
 
   // Opens the device driver for this device.
-  // This function is used by the static VideoCaptureDevice::Create function.
-  bool Init();
+  bool Init(const base::win::ScopedComPtr<IMFMediaSource>& source);
 
   // VideoCaptureDevice implementation.
   virtual void AllocateAndStart(const VideoCaptureParams& params,
                                 scoped_ptr<VideoCaptureDevice::Client> client)
       OVERRIDE;
   virtual void StopAndDeAllocate() OVERRIDE;
 
-  // Returns true iff the current platform supports the Media Foundation API
-  // and that the DLLs are available.  On Vista this API is an optional download
-  // but the API is advertised as a part of Windows 7 and onwards.  However,
-  // we've seen that the required DLLs are not available in some Win7
-  // distributions such as Windows 7 N and Windows 7 KN.
-  static bool PlatformSupported();
-
-  static void GetDeviceNames(Names* device_names);
-
-  static void GetDeviceSupportedFormats(const Name& device,
-                                        VideoCaptureFormats* formats);
-
   // Captured new video data.
   void OnIncomingCapturedData(const uint8* data,
                               int length,
                               int rotation,
                               const base::TimeTicks& time_stamp);
 
  private:
   void OnError(HRESULT hr);
 
   Name name_;
   base::win::ScopedComPtr<IMFActivate> device_;
   scoped_refptr<MFReaderCallback> callback_;
 
   base::Lock lock_;  // Used to guard the below variables.
   scoped_ptr<VideoCaptureDevice::Client> client_;
   base::win::ScopedComPtr<IMFSourceReader> reader_;
   VideoCaptureFormat capture_format_;
   bool capture_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(VideoCaptureDeviceMFWin);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_CAPTURE_WIN_VIDEO_CAPTURE_DEVICE_MF_WIN_H_