[Mojo Video Capture] Simplify API and some cleanups

services/video_capture/public/cpp/video_capture_settings.h

+// Copyright 2016 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 SERVICES_VIDEO_CAPTURE_PUBLIC_CPP_VIDEO_CAPTURE_FORMAT_H_
+#define SERVICES_VIDEO_CAPTURE_PUBLIC_CPP_VIDEO_CAPTURE_FORMAT_H_
+
+#include "media/capture/video_capture_types.h"
+#include "ui/gfx/geometry/size.h"
+
+namespace video_capture {
+
+// Cpp equivalent of Mojo struct video_capture::mojom::VideoCaptureFormat.
+struct VideoCaptureFormat {
+  gfx::Size frame_size;
+  float frame_rate;
+
+  void ConvertToMediaVideoCaptureFormat(
+      media::VideoCaptureFormat* target) const {
+    target->frame_size = frame_size;
+    target->frame_rate = frame_rate;
+    target->pixel_format = media::PIXEL_FORMAT_I420;
+    target->pixel_storage = media::PIXEL_STORAGE_CPU;
+  }
+};
+
+// Cpp equivalent of Mojo struct video_capture::mojom::VideoCaptureSettings.
+struct VideoCaptureSettings {
+  VideoCaptureFormat format;
+  media::ResolutionChangePolicy resolution_change_policy;
+  media::PowerLineFrequency power_line_frequency;
+
+  void ConvertToMediaVideoCaptureParams(
+      media::VideoCaptureParams* target) const {
+    format.ConvertToMediaVideoCaptureFormat(&(target->requested_format));
+    target->resolution_change_policy = resolution_change_policy;
+    target->power_line_frequency = power_line_frequency;
+  }
+};
+
+}  // namespace video_capture
+
+#endif  // SERVICES_VIDEO_CAPTURE_PUBLIC_CPP_VIDEO_CAPTURE_FORMAT_H_