Expand ar frame metadata with focal length and fnumber

openVulkanoCpp/AR/ArFrame.hpp

@@ -166,10 +166,16 @@ namespace OpenVulkano::AR
 
 		[[nodiscard]] float GetExposureOffset() const { return frameMetadata.exposureOffset; };
 		
+		[[nodiscard]] float GetFocalLength() const { return frameMetadata.focalLength; }
+		
+		[[nodiscard]] float GetFNumber() const { return frameMetadata.fNumber; }
+
 		[[nodiscard]] bool IsSaved() const { return m_saved; };
 
 		[[nodiscard]] const Scene::Texture* GetImageTexture();
 
+		[[nodiscard]] virtual std::string GetLensModel() const { return ""; }
+
 		void Save();
 
 		void SaveToFile(const std::filesystem::path& path, bool downsample = false);

openVulkanoCpp/AR/ArFrameMetadata.cpp

@@ -109,6 +109,8 @@ namespace OpenVulkano::AR
 		frameData.intrinsic = {intrinsic, res};
 		camNode["ExposureDuration"] >> frameData.exposureTime;
 		camNode["ExposureOffset"] >> frameData.exposureOffset;
+		camNode["FocalLength"] >> frameData.focalLength;
+		camNode["FNumber"] >> frameData.fNumber;
 		uint64_t nanos;
 		root["Timestamp"] >> nanos;
 		frameData.timestamp = nanos;
@@ -145,6 +147,8 @@ namespace OpenVulkano::AR
     - [ {}, {}, {} ]
   ExposureDuration: {}
   ExposureOffset: {}
+  FocalLength: {}
+  FNumber: {}
 Timestamp: {}
 TimestampDepth: {}
 TrackingState:
@@ -165,7 +169,8 @@ Light:
 	camMat[0][0], camMat[1][0], camMat[2][0],
 	camMat[0][1], camMat[1][1], camMat[2][1],
 	camMat[0][2], camMat[1][2], camMat[2][2],
-	exposureTime, exposureOffset, timestamp.GetNanos(), timestampDepth.GetNanos(),
+	exposureTime, exposureOffset, focalLength, fNumber,
+	timestamp.GetNanos(), timestampDepth.GetNanos(),
 	trackingState.GetName(), lightIntensity, lightColorTemp
 );
 		return meta;

openVulkanoCpp/AR/ArFrameMetadata.hpp

@@ -19,7 +19,7 @@ namespace OpenVulkano::AR
 		float exposureTime, exposureOffset, lightIntensity, lightColorTemp;
 		Math::Timestamp timestamp, timestampDepth;
 		ArTrackingState trackingState;
-		float physicalPixelSize = 0;
+		float physicalPixelSize = 0, focalLength = 0, fNumber = 0;
 
 		[[nodiscard]] std::string ToYaml() const;
 

openVulkanoCpp/AR/Provider/ArKit/ArFrameArKit.h

@@ -33,6 +33,8 @@ namespace OpenVulkano::AR::ArKit
 
 		bool GetCameraImageAsJpeg(const std::function<void(const char*, size_t)>& handler) override;
 		
+		std::string GetLensModel() const override;
+
 	private:
 		ARFrame* m_arKitFrame;
 		bool m_lockedColor, m_lockedDepth;

openVulkanoCpp/AR/Provider/ArKit/ArFrameArKit.mm

@@ -13,6 +13,7 @@
 #import <ARKit/ARLightEstimate.h>
 #import <ARKit/ARPointCloud.h>
 #import <CoreVideo/CoreVideo.h>
+#import <ImageIO/CGImageProperties.h>
 
 namespace OpenVulkano::AR::ArKit
 {
@@ -88,6 +89,12 @@ namespace OpenVulkano::AR::ArKit
 			frameData.timestampDepth = arFrame.capturedDepthDataTimestamp;
 			frameData.trackingState = GetArTrackingState(arFrame.camera);
 			
+			if (@available(iOS 16.0, *))
+			{
+				frameData.focalLength = [(NSNumber*)[arFrame.exifData valueForKey:(__bridge NSString*)kCGImagePropertyExifFocalLength] floatValue];
+				frameData.fNumber = [(NSNumber*)[arFrame.exifData valueForKey:(__bridge NSString*)kCGImagePropertyExifFNumber] floatValue];
+			}
+			
 			return frameData;
 		}
 	}
@@ -236,4 +243,13 @@ namespace OpenVulkano::AR::ArKit
 		[image release];
 		return success;
 	}
+	
+	std::string ArFrameArKit::GetLensModel() const
+	{
+		if (@available(iOS 16.0, *))
+		{
+			return [[m_arKitFrame.exifData valueForKey:(__bridge NSString*)kCGImagePropertyExifLensModel] UTF8String];
+		}
+		return "";
+	}
 }