拍照与CaptureElement自定义的分辨率与MediaCapture [英] Take photo with custom resolution from CaptureElement with MediaCapture

问题描述

我显示摄像机饲料使用CaptureElement即时通讯我的Windows Store应用。现在我想，当用户点击显示，这是我得到了用下面的代码工作，拍摄照片作为流。不幸的是图像只返回的分辨率为640×360，但是摄像头（表面RT）可拍摄图像与1280×800，我想做哪个。

我尝试设置

  encodingProperties.Height = 800; 
 encodingProperties.Width = 1280; 
  

但没有奏效。所以我怎么更改分辨率？

 专用异步无效captureElement_Tapped（对象发件人，TappedRoutedEventArgs E）
 {
变种encodingProperties = ImageEncodingProperties.CreateJpeg（）; 
 //encodingProperties.Height = 800; 
 //encodingProperties.Width = 1280; 
 WriteableBitmap的WBMP;使用
 
（VAR的ImageStream =新InMemoryRandomAccessStream（））
 {
等待captureMgr.CapturePhotoToStreamAsync（encodingProperties，的ImageStream）; 
等待imageStream.FlushAsync（）; 
 imageStream.Seek（0）; 
 WBMP =等待新WriteableBitmap的（1，1）.FromStream（的ImageStream）; 
} 
 
 capturedImage.Source = WBMP; 
} 
  

解决方案

所以，我终于想通了如何来此，也摆脱了可怕的HRESULT：0xC00D36B4的错误，这要部分归功于代码在这里找到：
的 http://social.msdn.microsoft.com/Forums/en-US/winappswithcsharp/thread/751b8d83-e646-4ce9-b019-f3c8599e18e0

我做了一些调整，这就是为什么我在这里转贴我的代码

  MediaCapture mediaCapture; 
 DeviceInformationCollection装置; 
 
保护覆盖无效的OnNavigatedTo（NavigationEventArgs E）
 {
设备=等待DeviceInformation.FindAllAsync（DeviceClass.VideoCapture）; 
 this.mediaCapture =新MediaCapture（）; 
如果（devices.Count（）&0）
 {
等待this.mediaCapture.InitializeAsync（新MediaCaptureInitializationSettings {VideoDeviceId = devices.ElementAt（1）.ID，PhotoCaptureSource = Windows.Media .Capture.PhotoCaptureSource.VideoPreview}）; 
 SetResolution（）; 
} 
} 
 
 
 //这是如何设置的分辨率
公共异步无效SetResolution（）
 {
 System.Collections.Generic.IReadOnlyList< IMediaEncodingProperties>资源; 
解析度= this.mediaCapture.VideoDeviceController.GetAvailableMediaStreamProperties（MediaStreamType.VideoPreview）; 
 UINT maxResolution = 0; 
 INT indexMaxResolution = 0; 
 
如果（res.Count> = 1）
 {
的for（int i = 0; I< res.Count;我++）
 {
 VideoEncodingProperties VP =（VideoEncodingProperties）RES [I] 
 
如果（vp.Width> maxResolution）
 {
 indexMaxResolution = I; 
 maxResolution = vp.Width; 
的Debug.WriteLine（分辨率：+ vp.Width）; 
} 
} 
等待this.mediaCapture.VideoDeviceController.SetMediaStreamPropertiesAsync（MediaStreamType.VideoPreview，水库[indexMaxResolution]）; 
} 
} 
  

虽然拍照，请确保您始终与合作。 VideoPreview，不.Photo！

I'm displaying the camera feed im my Windows Store App using the CaptureElement. Now I'd like to capture a photo as a stream when the user taps the display, which I got working using the code below. Unfortunatly the image returned only has a resolution of 640 x 360, however the camera (Surface RT) can take images with 1280x800, which I'd like to do.

I tried setting

        encodingProperties.Height = 800;
        encodingProperties.Width = 1280;

but that didn't work. So how do I change the resolution?

   private async void captureElement_Tapped(object sender, TappedRoutedEventArgs e)
    {
        var encodingProperties = ImageEncodingProperties.CreateJpeg();
        //encodingProperties.Height = 800;
        //encodingProperties.Width = 1280;
        WriteableBitmap wbmp;

        using (var imageStream = new InMemoryRandomAccessStream())
        {
            await captureMgr.CapturePhotoToStreamAsync(encodingProperties, imageStream);
            await imageStream.FlushAsync();
            imageStream.Seek(0);
            wbmp = await new WriteableBitmap(1, 1).FromStream(imageStream);
        }

        capturedImage.Source = wbmp;
    }

解决方案

So I finally figured out how to come by this and also get rid of the dreaded "HRESULT: 0xC00D36B4" error, partly thanks to the code found here: http://social.msdn.microsoft.com/Forums/en-US/winappswithcsharp/thread/751b8d83-e646-4ce9-b019-f3c8599e18e0

I made some adjustments, that's why I repost my code here

    MediaCapture mediaCapture;
    DeviceInformationCollection devices;

    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
        devices = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture);
        this.mediaCapture = new MediaCapture();
        if (devices.Count() > 0)
        {
            await this.mediaCapture.InitializeAsync(new MediaCaptureInitializationSettings { VideoDeviceId = devices.ElementAt(1).Id, PhotoCaptureSource = Windows.Media.Capture.PhotoCaptureSource.VideoPreview });
            SetResolution();
        }  
    }


    //This is how you can set your resolution
    public async void SetResolution()
    {
        System.Collections.Generic.IReadOnlyList<IMediaEncodingProperties> res;
        res = this.mediaCapture.VideoDeviceController.GetAvailableMediaStreamProperties(MediaStreamType.VideoPreview);
        uint maxResolution = 0;
        int indexMaxResolution = 0;

        if (res.Count >= 1)
        {
            for (int i = 0; i < res.Count; i++)
            {
                VideoEncodingProperties vp = (VideoEncodingProperties)res[i];

                if (vp.Width > maxResolution)
                {
                    indexMaxResolution = i;
                    maxResolution = vp.Width;
                    Debug.WriteLine("Resolution: " + vp.Width);
                }
            }
            await this.mediaCapture.VideoDeviceController.SetMediaStreamPropertiesAsync(MediaStreamType.VideoPreview, res[indexMaxResolution]);
        }
    }

Though taking photos, make sure you always work with .VideoPreview, not .Photo!

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