Rewrite DirectShow capture with native COM APIs

Replaces videoInput library with direct DirectShow implementation using
native COM interfaces. Provides full Mode support with automatic format
enumeration and negotiation.

Author: andrewfb

docs/htmlsrc/guides/dependencies/index.html

@@ -51,7 +51,6 @@ <h1>3rd Party Dependencies</h1>
         <tr><td><a href="http://www.glfw.org/">GLFW</a></td><td>3.2.1</td><td><a href="http://www.glfw.org/license.html">zlib</a></td><td>Linux windowing</td></tr>
         <tr><td><a href="https://github.com/nothings/stb">stb_image</a></td><td>2.02</td><td>Public domain</td><td>Linux & Android image read/write</td></tr>
         <tr><td><a href="https://gstreamer.freedesktop.org/">GStreamer</a></td><td>&lt;system&gt;</td><td><a href="https://gstreamer.freedesktop.org/documentation/frequently-asked-questions/licensing.html">LGPL</a></td><td>Linux video capture and playback</td></tr>
-        <tr><td><a href="https://github.com/ofTheo/videoInput">videoInput</a></td><td>0.1995</td><td>Public Domain</td><td>Windows desktop video capture</td></tr>
         <tr><td><a href="https://github.com/MSOpenTech/angle">ANGLE</a></td><td></td><td><a href="https://github.com/MSOpenTech/angle/blob/ms-master/LICENSE">BSD</a></td><td>Windows OpenGL emulation</td></tr>
         <tr><td><a href="https://github.com/nemtrif/utfcpp">utf8cpp</a></td><td></td><td><a href="https://github.com/nemtrif/utfcpp/blob/master/source/utf8.h">Boost</a></td><td>Unicode UTF-8 conversion</td></tr>
         </table>

include/cinder/CaptureImplDirectShow.h

@@ -1,14 +1,15 @@
 /*
- Copyright (c) 2010, The Barbarian Group
- All rights reserved.
+ Copyright (c) 2025, The Cinder Project
+
+ This code is intended to be used with the Cinder C++ library, http://libcinder.org
 
  Redistribution and use in source and binary forms, with or without modification, are permitted provided that
  the following conditions are met:
 
-    * Redistributions of source code must retain the above copyright notice, this list of conditions and
-	the following disclaimer.
-    * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
-	the following disclaimer in the documentation and/or other materials provided with the distribution.
+ * Redistributions of source code must retain the above copyright notice, this list of conditions and
+ the following disclaimer.
+ * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
+ the following disclaimer in the documentation and/or other materials provided with the distribution.
 
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
@@ -18,59 +19,84 @@
  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  POSSIBILITY OF SUCH DAMAGE.
-*/
+ */
 
 #pragma once
 
 #include "cinder/Cinder.h"
 #include "cinder/Capture.h"
 #include "cinder/Surface.h"
-#include "msw/videoInput/videoInput.h"
+#include <memory>
+#include <atomic>
+#include <Windows.h>
 
 namespace cinder {
 
 class CaptureImplDirectShow {
- public:
+  public:
 	class Device;
+	friend class SampleGrabberCallback;
 
 	CaptureImplDirectShow( int32_t width, int32_t height, const Capture::DeviceRef device );
+	CaptureImplDirectShow( const Capture::DeviceRef& device, const Capture::Mode& mode );
 	~CaptureImplDirectShow();
 
 	void start();
 	void stop();
 
-	bool		isCapturing();
-	bool		checkNewFrame() const;
+	bool isCapturing();
+	bool checkNewFrame() const;
 
-	int32_t		getWidth() const { return mWidth; }
-	int32_t		getHeight() const { return mHeight; }
+	int32_t getWidth() const { return mWidth; }
+	int32_t getHeight() const { return mHeight; }
 
-	Surface8uRef	getSurface() const;
+	Surface8uRef getSurface() const;
 
 	const Capture::DeviceRef getDevice() const { return mDevice; }
 
-	static const std::vector<Capture::DeviceRef>&	getDevices( bool forceRefresh = false );
+	static const std::vector<Capture::DeviceRef>& getDevices( bool forceRefresh = false );
+
+	// Public method to update dimensions (used by DirectShow setup)
+	void updateDimensions( int width, int height );
 
 	class Device : public Capture::Device {
- 	  public:
-		bool						checkAvailable() const;
-		bool						isConnected() const;
-		Capture::DeviceIdentifier	getUniqueId() const { return mUniqueId; }
-
-		Device( const std::string &name, int uniqueId ) : Capture::Device(), mUniqueId( uniqueId ) { mName = name; }
-	 protected:
-		int				mUniqueId;
+	  public:
+		bool					   checkAvailable() const;
+		bool					   isConnected() const;
+		Capture::DeviceIdentifier  getUniqueId() const { return mUniqueId; }
+		std::vector<Capture::Mode> getModes() const override;
+
+		Device( const std::string& name, int uniqueId )
+			: Capture::Device()
+			, mUniqueId( uniqueId )
+		{
+			mName = name;
+		}
+
+	  protected:
+		int mUniqueId;
 	};
 
- protected:
+  protected:
 	int									mDeviceID;
 	bool								mIsCapturing;
-	std::unique_ptr<class SurfaceCache>	mSurfaceCache;
+	std::unique_ptr<class SurfaceCache> mSurfaceCache;
 
-	int32_t					mWidth, mHeight;
-	mutable Surface8uRef	mCurrentFrame;
-	Capture::DeviceRef		mDevice;
-};
+	int32_t				 mWidth, mHeight;
+	mutable Surface8uRef mCurrentFrame;
+	Capture::DeviceRef	 mDevice;
 
-} //namespace
+	// New integrated DirectShow members (using void* to avoid forward declaration issues)
+	void*							 mComInit;
+	void*							 mDeviceContext;
+	void*							 mCallback;
+	std::unique_ptr<unsigned char[]> mPixelBuffer;
+
+	mutable std::atomic<bool> mNewFrameAvailable;
+	mutable CRITICAL_SECTION  mCriticalSection;
+
+	// Direct DirectShow setup methods
+	bool setupDeviceDirect( int deviceId, int width, int height );
+};
 
+} // namespace cinder