Fixes for re-enabling more MSVC level 4 warnings: media/ edition

media/video/capture/win/video_capture_device_mf_win.h

 // Copyright (c) 2012 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.
 
 // Windows specific implementation of VideoCaptureDevice.
 // DirectShow is used for capturing. DirectShow provide its own threads
 // for capturing.
 
 #ifndef MEDIA_VIDEO_CAPTURE_WIN_VIDEO_CAPTURE_DEVICE_MF_WIN_H_
 #define MEDIA_VIDEO_CAPTURE_WIN_VIDEO_CAPTURE_DEVICE_MF_WIN_H_
 
 #include <mfidl.h>
 #include <mfreadwrite.h>
 
 #include <vector>
 
 #include "base/synchronization/lock.h"
 #include "base/threading/non_thread_safe.h"
 #include "base/win/scoped_comptr.h"
 #include "media/base/media_export.h"
 #include "media/video/capture/video_capture_device.h"
 
 interface IMFSourceReader;
 
 namespace media {
 
 class MFReaderCallback;
 
+const DWORD kFirstVideoStream =
+    static_cast<DWORD>(MF_SOURCE_READER_FIRST_VIDEO_STREAM);
+
 class MEDIA_EXPORT VideoCaptureDeviceMFWin
     : public base::NonThreadSafe,
       public VideoCaptureDevice {
  public:
   static bool FormatFromGuid(const GUID& guid, VideoPixelFormat* format);
 
   explicit VideoCaptureDeviceMFWin(const Name& device_name);
   virtual ~VideoCaptureDeviceMFWin();
 
   // Opens the device driver for this device.
@@ skipping 23 matching lines @@
   base::win::ScopedComPtr<IMFSourceReader> reader_;
   VideoCaptureFormat capture_format_;
   bool capture_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(VideoCaptureDeviceMFWin);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_CAPTURE_WIN_VIDEO_CAPTURE_DEVICE_MF_WIN_H_