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

media/video/capture/file_video_capture_device.h

 // Copyright 2013 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 MEDIA_VIDEO_CAPTURE_FILE_VIDEO_CAPTURE_DEVICE_H_
 #define MEDIA_VIDEO_CAPTURE_FILE_VIDEO_CAPTURE_DEVICE_H_
 
 #include <string>
 
 #include "base/files/file.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_checker.h"
 #include "media/video/capture/video_capture_device.h"
 
 namespace media {
 
 // Implementation of a VideoCaptureDevice class that reads from a file. Used for
 // testing the video capture pipeline when no real hardware is available. The
 // only supported file format is YUV4MPEG2 (a.k.a. Y4M), a minimal container
 // with a series of uncompressed video only frames, see the link
 // http://wiki.multimedia.cx/index.php?title=YUV4MPEG2 for more information
 // on the file format. Several restrictions and notes apply, see the
 // implementation file.
 // Example videos can be found in http://media.xiph.org/video/derf.
 class MEDIA_EXPORT FileVideoCaptureDevice : public VideoCaptureDevice {
  public:
-  // VideoCaptureDevice implementation, static methods. Create() returns a
-  // pointer to the object, fully owned by the caller.
-  // TODO(mcasas): Create() should return a scoped_ptr<> http://crbug.com/321613
-  static VideoCaptureDevice* Create(const Name& device_name);
-  static void GetDeviceNames(Names* device_names);
-  static void GetDeviceSupportedFormats(const Name& device,
-                                        VideoCaptureFormats* supported_formats);
+  static int64 ParseFileAndExtractVideoFormat(
+      base::File* file,
+      media::VideoCaptureFormat* video_format);
+  static base::File OpenFileForRead(const base::FilePath& file_path);
+
+  // Constructor of the class, with a fully qualified file path as input, which
+  // represents the Y4M video file to stream repeatedly.
+  explicit FileVideoCaptureDevice(const base::FilePath& file_path);
 
   // VideoCaptureDevice implementation, class methods.
   virtual ~FileVideoCaptureDevice();
   virtual void AllocateAndStart(
       const VideoCaptureParams& params,
       scoped_ptr<VideoCaptureDevice::Client> client) OVERRIDE;
   virtual void StopAndDeAllocate() OVERRIDE;
 
  private:
-  // Constructor of the class, with a fully qualified file path as input, which
-  // represents the Y4M video file to stream repeatedly.
-  explicit FileVideoCaptureDevice(const base::FilePath& file_path);
   // Returns size in bytes of an I420 frame, not including possible paddings,
   // defined by |capture_format_|.
   int CalculateFrameSize();
 
   // Called on the |capture_thread_|.
   void OnAllocateAndStart(const VideoCaptureParams& params,
                           scoped_ptr<Client> client);
   void OnStopAndDeAllocate();
   void OnCaptureTask();
 
@@ skipping 13 matching lines @@
   int frame_size_;
   int64 current_byte_index_;
   int64 first_frame_byte_index_;
 
   DISALLOW_COPY_AND_ASSIGN(FileVideoCaptureDevice);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_CAPTURE_FILE_VIDEO_CAPTURE_DEVICE_H_