This is the VideoCaptureDevice implementation for windows.

media/video/capture/win/sink_input_pin_win.h

Index: media/video/capture/win/sink_input_pin_win.h
===================================================================
--- media/video/capture/win/sink_input_pin_win.h	(revision 0)
+++ media/video/capture/win/sink_input_pin_win.h	(revision 0)
@@ -0,0 +1,49 @@
+// 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 input pin used for receiving captured frames from
+// a DirectShow Capture filter.
+
+#ifndef MEDIA_VIDEO_CAPTURE_WIN_SINK_INPUT_PIN_WIN_H_
+#define MEDIA_VIDEO_CAPTURE_WIN_SINK_INPUT_PIN_WIN_H_
+#pragma once
+
+#include "media/video/capture/video_capture_device.h"
+#include "media/video/capture/win/pin_base_win.h"
+#include "media/video/capture/win/sink_filter_win.h"
+
+namespace media {
+
+// Const used for converting Seconds to REFERENCE_TIME.
+extern const REFERENCE_TIME kSecondsToReferenceTime;
+
+// Input pin of the SinkFilter.
+class SinkInputPin : public PinBase {
+ public:
+  SinkInputPin(IBaseFilter* filter, SinkFilterObserver* observer);
+  virtual ~SinkInputPin();
+
+  void SetRequestedMediaCapability(
+      const VideoCaptureDevice::Capability& capability);
+  // Returns the capability that is negotiated when this
+  // pin is connected to a media filter.
+  const VideoCaptureDevice::Capability& ResultingCapability();
+
+  // Implement PinBase.
+  virtual bool IsMediaTypeValid(const AM_MEDIA_TYPE* media_type);
+  virtual bool GetValidMediaType(int index, AM_MEDIA_TYPE* media_type);
+
+  STDMETHOD(Receive)(IMediaSample* media_sample);
+
+ private:
+  VideoCaptureDevice::Capability requested_capability_;
+  VideoCaptureDevice::Capability resulting_capability_;
+  SinkFilterObserver* observer_;
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(SinkInputPin);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_VIDEO_CAPTURE_WIN_SINK_INPUT_PIN_WIN_H_