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

media/video/capture/file_video_capture_device_factory.cc

+// 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.
+
+#include "media/video/capture/file_video_capture_device_factory.h"
+
+#include "base/command_line.h"
+#include "base/files/file_path.h"
+#include "base/strings/sys_string_conversions.h"
+#include "media/base/media_switches.h"
+#include "media/video/capture/file_video_capture_device.h"
+
+namespace media {
+
+const char kFileVideoCaptureDeviceName[] =
+    "/dev/placeholder-for-file-backed-fake-capture-device";
+
+// Inspects the command line and retrieves the file path parameter.
+base::FilePath GetFilePathFromCommandLine() {
+  base::FilePath command_line_file_path =
+      CommandLine::ForCurrentProcess()->GetSwitchValuePath(
+          switches::kUseFileForFakeVideoCapture);
+  CHECK(!command_line_file_path.empty());
+  return command_line_file_path;
+}
+
+scoped_ptr<VideoCaptureDevice> FileVideoCaptureDeviceFactory::Create(
+    const VideoCaptureDevice::Name& device_name) {
+#if defined(OS_WIN)
+  return scoped_ptr<VideoCaptureDevice>(new FileVideoCaptureDevice(
+      base::FilePath(base::SysUTF8ToWide(device_name.name()))));
+#else
+  return scoped_ptr<VideoCaptureDevice>(new FileVideoCaptureDevice(
+      base::FilePath(device_name.name())));
+#endif
+}
+
+void FileVideoCaptureDeviceFactory::GetDeviceNames(
+    VideoCaptureDevice::Names* const device_names) {
+  DCHECK(device_names->empty());
+  base::FilePath command_line_file_path = GetFilePathFromCommandLine();
+#if defined(OS_WIN)
+  device_names->push_back(VideoCaptureDevice::Name(
+      base::SysWideToUTF8(command_line_file_path.value()),
+      kFileVideoCaptureDeviceName));
+#else
+  device_names->push_back(VideoCaptureDevice::Name(
+      command_line_file_path.value(),
+      kFileVideoCaptureDeviceName));
+#endif
+}
+
+void FileVideoCaptureDeviceFactory::GetDeviceSupportedFormats(
+    const VideoCaptureDevice::Name& device,
+    VideoCaptureFormats* supported_formats) {
+  base::File file =
+      FileVideoCaptureDevice::OpenFileForRead(GetFilePathFromCommandLine());
+  VideoCaptureFormat capture_format;
+  FileVideoCaptureDevice::ParseFileAndExtractVideoFormat(&file,
+                                                         &capture_format);
+  supported_formats->push_back(capture_format);
+}
+
+}  // namespace media