Win Video Capture: add support for WDM capture devices using a WDM Crossbar filter.

media/video/capture/win/video_capture_device_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_WIN_H_
 #define MEDIA_VIDEO_CAPTURE_WIN_VIDEO_CAPTURE_DEVICE_WIN_H_
@@ skipping 36 matching lines @@
     AM_MEDIA_TYPE** Receive();
 
    private:
     void FreeMediaType(AM_MEDIA_TYPE* mt);
     void DeleteMediaType(AM_MEDIA_TYPE* mt);
 
     AM_MEDIA_TYPE* media_type_;
   };
 
   static HRESULT GetDeviceFilter(const std::string& device_id,
+                                 const CLSID device_class_id,
                                  IBaseFilter** filter);
-  static bool PinMatchesCategory(IPin* pin, REFGUID category);
   static base::win::ScopedComPtr<IPin> GetPin(IBaseFilter* filter,
                                               PIN_DIRECTION pin_dir,
-                                              REFGUID category);
+                                              REFGUID category,
+                                              REFGUID major_type);
   static VideoPixelFormat TranslateMediaSubtypeToPixelFormat(
       const GUID& sub_type);
 
   explicit VideoCaptureDeviceWin(const Name& device_name);
   virtual ~VideoCaptureDeviceWin();
   // Opens the device driver for this device.
   bool Init();
 
   // VideoCaptureDevice implementation.
   virtual void AllocateAndStart(
       const VideoCaptureParams& params,
       scoped_ptr<VideoCaptureDevice::Client> client) OVERRIDE;
   virtual void StopAndDeAllocate() OVERRIDE;
 
  private:
   enum InternalState {
     kIdle,  // The device driver is opened but camera is not in use.
     kCapturing,  // Video is being captured.
     kError  // Error accessing HW functions.
             // User needs to recover by destroying the object.
   };
 
   // Implements SinkFilterObserver.
   virtual void FrameReceived(const uint8* buffer, int length);
 
   bool CreateCapabilityMap();
   void SetAntiFlickerInCaptureFilter();
+  HRESULT InstantiateWDMFiltersAndPins();
+  HRESULT AddWDMCrossbarFilterToGraphAndConnect();
   void SetErrorState(const std::string& reason);
 
   Name device_name_;
   InternalState state_;
   scoped_ptr<VideoCaptureDevice::Client> client_;
 
   base::win::ScopedComPtr<IBaseFilter> capture_filter_;
   base::win::ScopedComPtr<IGraphBuilder> graph_builder_;
   base::win::ScopedComPtr<IMediaControl> media_control_;
   base::win::ScopedComPtr<IPin> input_sink_pin_;
   base::win::ScopedComPtr<IPin> output_capture_pin_;
   // Used when using a MJPEG decoder.
   base::win::ScopedComPtr<IBaseFilter> mjpg_filter_;
   base::win::ScopedComPtr<IPin> input_mjpg_pin_;
   base::win::ScopedComPtr<IPin> output_mjpg_pin_;
+  // Used for WDM devices as specified by |device_name_|. These devices need a
+  // WDM Crossbar Filter upstream from the Capture filter.
+  base::win::ScopedComPtr<IBaseFilter> crossbar_filter_;
+  base::win::ScopedComPtr<IPin> crossbar_video_output_pin_;
+  base::win::ScopedComPtr<IPin> analog_video_input_pin_;
 
   scoped_refptr<SinkFilter> sink_filter_;
 
   // Map of all capabilities this device support.
   CapabilityList capabilities_;
   VideoCaptureFormat capture_format_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(VideoCaptureDeviceWin);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_VIDEO_CAPTURE_WIN_VIDEO_CAPTURE_DEVICE_WIN_H_