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

media/video/capture/fake_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/fake_video_capture_device_factory.h"
+
+#include "base/strings/stringprintf.h"
+#include "media/video/capture/fake_video_capture_device.h"
+
+namespace media {
+
+FakeVideoCaptureDeviceFactory::FakeVideoCaptureDeviceFactory()
+    : number_of_devices_(1) {
+}
+
+scoped_ptr<VideoCaptureDevice> FakeVideoCaptureDeviceFactory::Create(
+    const VideoCaptureDevice::Name& device_name) {
+  for (int n = 0; n < number_of_devices_; ++n) {
+    std::string possible_id = base::StringPrintf("/dev/video%d", n);
+    if (device_name.id().compare(possible_id) == 0)
+      return scoped_ptr<VideoCaptureDevice>(new FakeVideoCaptureDevice());
+  }
+  return scoped_ptr<VideoCaptureDevice>();
+}
+
+void FakeVideoCaptureDeviceFactory::GetDeviceNames(
+    VideoCaptureDevice::Names* const device_names) {
+  DCHECK(device_names->empty());
+  for (int n = 0; n < number_of_devices_; ++n) {
+    VideoCaptureDevice::Name name(base::StringPrintf("fake_device_%d", n),
+                                  base::StringPrintf("/dev/video%d", n));
+    device_names->push_back(name);
+  }
+}
+
+void FakeVideoCaptureDeviceFactory::GetDeviceSupportedFormats(
+    const VideoCaptureDevice::Name& device,
+    VideoCaptureFormats* supported_formats) {
+  const int frame_rate = 1000 / FakeVideoCaptureDevice::kFakeCaptureTimeoutMs;
+  const gfx::Size supported_sizes[] = {gfx::Size(320, 240),
+                                       gfx::Size(640, 480),
+                                       gfx::Size(1280, 720)};
+  supported_formats->clear();
+  for (size_t i = 0; i < arraysize(supported_sizes); ++i) {
+    supported_formats->push_back(VideoCaptureFormat(supported_sizes[i],
+                                                    frame_rate,
+                                                    media::PIXEL_FORMAT_I420));
+  }
+}
+
+}  // namespace media