This is the VideoCaptureDevice implementation for windows.

media/video/capture/win/sink_filter_win.h

Index: media/video/capture/win/sink_filter_win.h
===================================================================
--- media/video/capture/win/sink_filter_win.h	(revision 0)
+++ media/video/capture/win/sink_filter_win.h	(revision 0)
@@ -0,0 +1,54 @@
+// Copyright (c) 2011 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.
+
+// Implement a DirectShow sink filter used for receiving captured frames from
+// a DirectShow Capture filter.
+
+#ifndef MEDIA_VIDEO_CAPTURE_WIN_SINK_FILTER_WIN_H_
+#define MEDIA_VIDEO_CAPTURE_WIN_SINK_FILTER_WIN_H_
+
+#include <windows.h>
+
+#include "base/memory/scoped_ptr.h"
+#include "media/video/capture/video_capture_device.h"
+#include "media/video/capture/win/filter_base_win.h"
+#include "media/video/capture/win/sink_filter_observer_win.h"
+
+// Define GUID for I420. This is the color format we would like to support but
+// it is not defined in the DirectShow SDK.
+// http://msdn.microsoft.com/en-us/library/dd757532.aspx
+// 30323449-0000-0010-8000-00AA00389B71.
+extern GUID kMediaSubTypeI420;
+
+namespace media {
+
+class SinkInputPin;
+
+class __declspec(uuid("88cdbbdc-a73b-4afa-acbf-15d5e2ce12c3"))
+    SinkFilter : public FilterBase {
+ public:
+  explicit SinkFilter(SinkFilterObserver* observer);
+  virtual ~SinkFilter();
+
+  void SetRequestedMediaCapability(
+      const VideoCaptureDevice::Capability& capability);
+  // Returns the capability that is negotiated when this
+  // filter is connected to a media filter.
+  const VideoCaptureDevice::Capability& ResultingCapability();
+
+  // Implement FilterBase.
+  virtual size_t NoOfPins();
+  virtual IPin* GetPin(int index);
+
+  STDMETHOD(GetClassID)(CLSID* clsid);
+
+ private:
+  scoped_refptr<SinkInputPin> input_pin_;
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(SinkFilter);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_VIDEO_CAPTURE_WIN_SINK_FILTER_WIN_H_