/// <summary>
/// 获得预览分辨率
/// </summary>
private static void GetPreviewSize()
{
var previewSizeList = MainCamera.VideoDeviceController.GetAvailableMediaStreamProperties(MediaStreamType.VideoPreview);
var sizeList = new List <VideoEncodingProperties>();
var listCount = previewSizeList.Count;
foreach (var item in previewSizeList)
{
var sizeItem = item as VideoEncodingProperties;
if (sizeItem == null)
{
continue;
}
if (sizeItem.Width < AppDefaultHelper.CAMERA_VGA_WIDTH || sizeItem.Height < AppDefaultHelper.CAMERA_VGA_HEIGHT)
{
continue;
}
var oldItem = sizeList.FirstOrDefault(li => (li.Width == sizeItem.Width && li.Height == sizeItem.Height));
if (oldItem != null)
{
uint oldRate = oldItem.FrameRate.Numerator / oldItem.FrameRate.Denominator;
uint rate = sizeItem.FrameRate.Numerator / sizeItem.FrameRate.Denominator;
if (oldRate < rate)
{
sizeList.Remove(oldItem);
}
else
{
continue;
}
}
sizeList.Add(sizeItem);
}
if (CameraPreviewSizeList == null)
{
CameraPreviewSizeList = new List <CameraSizeInfo>();
}
else
{
CameraPreviewSizeList.Clear();
}
foreach (var item in sizeList.OrderBy(li => li.Width))
{
CameraPreviewSizeList.Add(new CameraSizeInfo(item, item.Width, item.Height));
}
}
/// <summary>
/// 停止预览
/// </summary>
public static async Task StopPreview()
{
try
{
if (CameraPreviewSizeList != null)
{
CameraPreviewSizeList.Clear();
}
CameraPreviewSizeList = null;
if (CameraPhotoSizeList != null)
{
CameraPhotoSizeList.Clear();
}
await CloseLowLagPhoto();
CameraPhotoSizeList = null;
IsSupportROI = false;
IsSupportContinuousCapture = false;
IsSupportHWZoom = false;
if (MainCamera != null)
{
try
{
await MainCamera.StopPreviewAsync();
}
catch (Exception ex)
{
}
try
{
MainCamera.Dispose();
}
catch (Exception ex)
{
}
}
MainCamera = null;
CurrentCamDevice = null;
FailedIndex = 1;
IsCanUseCamera = false;
}
catch (Exception ex)
{
}
}
