NativeCameraInferface.cpp

#include "pch.h"
#include "NativeCameraInterface.h"

using namespace Microsoft::WRL;
using namespace Windows::Foundation;
using namespace Windows::Foundation::Collections;
using namespace Windows::Phone::Media::Capture;

// Called each time a preview frame is available
void NativeCameraInterface::Native::CameraCapturePreviewSink::OnFrameAvailable(
  DXGI_FORMAT format,
	UINT width,
	UINT height,
	BYTE* pixels
	)
{
	OutputDebugString(L"Preview!\n");
	// Insert your own code to process each preview frame here
}

// Called each time a captured frame is available	
void NativeCameraInterface::Native::CameraCaptureSampleSink::OnSampleAvailable(
	ULONGLONG hnsPresentationTime,
	ULONGLONG hnsSampleDuration,
	DWORD cbSample,
	BYTE* pSample)
{
	OutputDebugString(L"Full!\n");
	// Insert your own code to process each captured frame here
}

NativeCameraInterface::Native::NativeCapture::NativeCapture()
{
	// Set the capture dimensions
	Size captureDimensions;
	captureDimensions.Width = 1920;
	captureDimensions.Height = 1080;		

	// Open the AudioVideoCaptureDevice for video only
	IAsyncOperation<AudioVideoCaptureDevice^> ^openOperation = AudioVideoCaptureDevice::OpenForVideoOnlyAsync(CameraSensorLocation::Back, captureDimensions);

	openOperation->Completed = ref new AsyncOperationCompletedHandler<AudioVideoCaptureDevice^>(
		[this] (IAsyncOperation<AudioVideoCaptureDevice^> ^operation, Windows::Foundation::AsyncStatus status)
		{
			if (status == Windows::Foundation::AsyncStatus::Completed)
			{
				auto captureDevice = operation->GetResults();

				// Save the reference to the opened video capture device
				pAudioVideoCaptureDevice = captureDevice;

				// Retrieve the native ICameraCaptureDeviceNative interface from the managed video capture device
				ICameraCaptureDeviceNative *iCameraCaptureDeviceNative = NULL; 
				HRESULT hr = reinterpret_cast<IUnknown*>(captureDevice)->QueryInterface(__uuidof(ICameraCaptureDeviceNative), (void**) &iCameraCaptureDeviceNative);

				// Save the pointer to the native interface
				pCameraCaptureDeviceNative = iCameraCaptureDeviceNative;

				// Initialize the preview dimensions (see the accompanying article at )
				// The aspect ratio of the capture and preview resolution must be equal,
				// 4:3 for capture => 4:3 for preview, and 16:9 for capture => 16:9 for preview.
				Size previewDimensions;
				previewDimensions.Width = 800;
				previewDimensions.Height = 448;					

				IAsyncAction^ setPreviewResolutionAction = pAudioVideoCaptureDevice->SetPreviewResolutionAsync(previewDimensions);
				setPreviewResolutionAction->Completed = ref new AsyncActionCompletedHandler(
					[this](IAsyncAction^ action, Windows::Foundation::AsyncStatus status)
					{
						HResult hr = action->ErrorCode;


						if (status == Windows::Foundation::AsyncStatus::Completed)
						{
							// Create the sink
							MakeAndInitialize<CameraCapturePreviewSink>(&pCameraCapturePreviewSink);
							pCameraCaptureDeviceNative->SetPreviewSink(pCameraCapturePreviewSink);

							// Set the preview format
							pCameraCaptureDeviceNative->SetPreviewFormat(DXGI_FORMAT::DXGI_FORMAT_B8G8R8A8_UNORM);						
						}
					}
				);

				// Retrieve IAudioVideoCaptureDeviceNative native interface from managed projection.
				IAudioVideoCaptureDeviceNative *iAudioVideoCaptureDeviceNative = NULL;
				hr = reinterpret_cast<IUnknown*>(captureDevice)->QueryInterface(__uuidof(IAudioVideoCaptureDeviceNative), (void**) &iAudioVideoCaptureDeviceNative);

				// Save the pointer to the IAudioVideoCaptureDeviceNative native interface
				pAudioVideoCaptureDeviceNative = iAudioVideoCaptureDeviceNative;

				// Set sample encoding format to ARGB. See the documentation for further values.
				pAudioVideoCaptureDevice->VideoEncodingFormat = CameraCaptureVideoFormat::Argb;

				// Initialize and set the CameraCaptureSampleSink class as sink for captures samples
				MakeAndInitialize<CameraCaptureSampleSink>(&pCameraCaptureSampleSink);
				pAudioVideoCaptureDeviceNative->SetVideoSampleSink(pCameraCaptureSampleSink);

				// Start recording (only way to receive samples using the ICameraCaptureSampleSink interface
				pAudioVideoCaptureDevice->StartRecordingToSinkAsync();
			}
		}
	);
}