public async Task <ICameraPreview> OpenWithPreviewAsync(Xamarin.Forms.Size previewRequestSize)
{
await OpenAsync(true);
var stateCallback = new StateCallback();
stateCallback.Configured += SessionConfigured;
stateCallback.ConfigureFailed += SessionConfigureFailed;
var previewSurface = _cameraPreview.CreateSurface(previewRequestSize);
_previewRequestBuilder.AddTarget(previewSurface);
_previewRequestBuilder.Set(CaptureRequest.ControlAfMode, (int)ControlAFMode.ContinuousPicture);
var characteristics = _manager.GetCameraCharacteristics(_cameraDevice.Id);
var map = (StreamConfigurationMap)characteristics.Get(CameraCharacteristics.ScalerStreamConfigurationMap);
// ReSharper disable once CoVariantArrayConversion
_imageSize = (Size)Collections.Max(
Arrays.AsList(map.GetOutputSizes((int)ImageFormatType.Jpeg)),
new CompareSizesByArea());
_imageReader = ImageReader.NewInstance(_imageSize.Width, _imageSize.Height,
ImageFormatType.Jpeg, /* maxImages */ 2);
_imageAvailableListener = new ImageAvailableListener();
_imageAvailableListener.ImageAvailable += CaptureAvailable;
_imageReader.SetOnImageAvailableListener(_imageAvailableListener, _backgroundThread.Handler);
var surfaces = new List <Surface> {
previewSurface, _imageReader.Surface
};
_cameraDevice.CreateCaptureSession(surfaces, stateCallback, null);
return(_cameraPreview);
}
public static bool IsFlashSupported(Android.Hardware.Camera2.CameraManager cameraManager, string cameraId)
{
var characteristics = cameraManager.GetCameraCharacteristics(cameraId);
// Check if the flash is supported.
var available = (Boolean)characteristics.Get(CameraCharacteristics.FlashInfoAvailable);
if (available == null)
{
return(false);
}
return((bool)available);
}
private Android.Util.Size GetBufferSize(Android.Util.Size requestSize)
{
var characteristics = _manager.GetCameraCharacteristics(_camera.Id);
var map = (StreamConfigurationMap)characteristics.Get(CameraCharacteristics.ScalerStreamConfigurationMap);
// ReSharper disable once CoVariantArrayConversion
var largest = (Android.Util.Size)Collections.Max(
Arrays.AsList(map.GetOutputSizes((int)ImageFormatType.Yuv420888)),
new CompareSizesByArea());
var swappedDimensions = IsSwappedDimensions(characteristics);
var rotatedPreviewSize = GetRotatedPreviewSize(requestSize, swappedDimensions);
var maxPreviewSize = GetMaxPreviewSize(swappedDimensions);
return(ChooseOptimalSize(map.GetOutputSizes(Class.FromType(typeof(SurfaceTexture))),
rotatedPreviewSize.Width, rotatedPreviewSize.Height, maxPreviewSize.Width,
maxPreviewSize.Height, largest));
}