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

media/video/capture/video_capture_device_factory.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 MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_FACTORY_H_
+#define MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_FACTORY_H_
+
+#include "base/threading/thread_checker.h"
+#include "media/video/capture/video_capture_device.h"
+
+namespace media {
+
+// VideoCaptureDeviceFactory is the base class for creation of video capture
+// devices in the different platforms. VCDFs are created by MediaStreamManager
+// on IO thread and plugged into VideoCaptureManager, who owns and operates them
+// in Device Thread (a.k.a. Audio Thread).

[perkj_chrome, 2014/04/24 14:43:32]

a.k.a. Audio Thread ? 

[mcasas, 2014/04/24 20:20:26]

Yes, this is confusing but it seems that Audio thread was there earlier and was
reused as generic Device Thread [1], [2]. 
In Mac crashes, it identifies as Audio Thread.

[1]
https://code.google.com/p/chromium/codesearch#chromium/src/content/browser/re...
[2]
https://code.google.com/p/chromium/codesearch#chromium/src/media/audio/audio_...

+class MEDIA_EXPORT VideoCaptureDeviceFactory {
+ public:
+  VideoCaptureDeviceFactory();
+  virtual ~VideoCaptureDeviceFactory() {}
+
+  // Creates a VideoCaptureDevice object. Returns NULL if something goes wrong.
+  virtual scoped_ptr<VideoCaptureDevice> Create(
+      const VideoCaptureDevice::Name& device_name);
+
+  // Gets the names of all video capture devices connected to this computer.
+  virtual void GetDeviceNames(VideoCaptureDevice::Names* device_names);
+
+  // Gets the supported formats of a particular device attached to the system.
+  // This method should be called before allocating or starting a device. In
+  // case format enumeration is not supported, or there was a problem, the
+  // formats array will be empty.
+  virtual void GetDeviceSupportedFormats(
+      const VideoCaptureDevice::Name& device,
+      VideoCaptureFormats* supported_formats);
+
+ protected:
+  base::ThreadChecker thread_checker_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(VideoCaptureDeviceFactory);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_VIDEO_CAPTURE_VIDEO_CAPTURE_DEVICE_FACTORY_H_