Unity PhotoCapture return 'No capture devices are available.' Hololens2 上的错误

Question

我正在尝试在Hololens2中拍照或获取流视频，我使用的是Unity：2020.3.2f1 平台：UWP。

我正在尝试测试这个样本： https://docs.unity3d.com/2020.2/Documentation/ScriptReference/Windows.WebCam.PhotoCapture.html

但是当我在我的 Hololens2 设备上测试这个样本时，我得到了两个错误，比如： 'The stream number provided was invalid.' 'No capture devices are available.'

这是我的Unity项目设置： enter image description here enter image description here

我还启用了 Package.appxmanifest 麦克风和 WeCam，从 hololens2 卸载应用程序并重新构建并部署，但我仍然遇到两个错误。

有什么方法可以修复这个错误吗？

请原谅我的英语很糟糕

这是我当前的代码。我想我只调用一个媒体 API.

using Microsoft.MixedReality.OpenXR;
using System.IO;
using System.Linq;
using UnityEngine;
using UnityEngine.Windows.WebCam;


public class Capture : MonoBehaviour
{
/// <summary>
/// Allows this class to behave like a singleton
/// </summary>
public static Capture instance;

/// <summary>
/// Keeps track of tapCounts to name the captured images 
/// </summary>
private int tapsCount;

/// <summary>
/// PhotoCapture object used to capture images on HoloLens 
/// </summary>
private PhotoCapture photoCaptureObject = null;

/// <summary>
/// HoloLens class to capture user gestures
/// </summary>
private GestureRecognizer recognizer;

//Test

private HoloLensCameraStream.Resolution _resolution;
private VideoCapture _videoCapture;

void Awake() {
    instance = this;
}

// Start is called before the first frame update
void Start() {
    // Initialises user gestures capture 
    //recognizer = new GestureRecognizer();
    //recognizer.SetRecognizableGestures(GestureSettings.Tap);
    //recognizer.Tapped += TapHandler;
    //recognizer.StartCapturingGestures();
}

private void ExecuteImageCaptureAndAnalysis() {
    Resolution cameraResolution = PhotoCapture.SupportedResolutions.OrderByDescending
        ((res) => res.width * res.height).First();
    Texture2D targetTexture = new Texture2D(cameraResolution.width, cameraResolution.height);

    PhotoCapture.CreateAsync(false, delegate (PhotoCapture captureObject)
    {
        photoCaptureObject = captureObject;

        CameraParameters c = new CameraParameters();
        c.hologramOpacity = 0.0f;
        c.cameraResolutionWidth = targetTexture.width;
        c.cameraResolutionHeight = targetTexture.height;
        c.pixelFormat = CapturePixelFormat.BGRA32;

        captureObject.StartPhotoModeAsync(c, delegate (PhotoCapture.PhotoCaptureResult result)
        {
            string filename = string.Format(@"CapturedImage{0}.jpg", tapsCount);
            string filePath = Path.Combine(Application.persistentDataPath, filename);

            // Set the image path on the FaceAnalysis class
            //FaceAnalysis.Instance.imagePath = filePath;
            photoCaptureObject.TakePhotoAsync
            (filePath, PhotoCaptureFileOutputFormat.JPG, OnCapturedPhotoToDisk);
        });
    });
    Debug.Log("Success!");
}

/// <summary>
/// Called right after the photo capture process has concluded
/// </summary>
void OnCapturedPhotoToDisk(PhotoCapture.PhotoCaptureResult result) {
    photoCaptureObject.StopPhotoModeAsync(OnStoppedPhotoMode);
}

/// <summary>
/// Register the full execution of the Photo Capture. If successful, it will begin the Image Analysis process.
/// </summary>
void OnStoppedPhotoMode(PhotoCapture.PhotoCaptureResult result) {
    photoCaptureObject.Dispose();
    photoCaptureObject = null;
}

public void CaptureImage() {
    ExecuteImageCaptureAndAnalysis();
}

}

Answer 1

请创建一个新的 Unity 项目并尝试以下代码，它适用于 HoloLens2：

public void StartCap()
{
    PhotoCapture.CreateAsync(false, OnPhotoCaptureCreated);

}
private PhotoCapture photoCaptureObject = null;

void OnPhotoCaptureCreated(PhotoCapture captureObject)
{
    photoCaptureObject = captureObject;

    Resolution cameraResolution = PhotoCapture.SupportedResolutions.OrderByDescending((res) => res.width * res.height).First();

    CameraParameters c = new CameraParameters();
    c.hologramOpacity = 0.0f;
    c.cameraResolutionWidth = cameraResolution.width;
    c.cameraResolutionHeight = cameraResolution.height;
    c.pixelFormat = CapturePixelFormat.BGRA32;

    captureObject.StartPhotoModeAsync(c, OnPhotoModeStarted);
}
private void OnPhotoModeStarted(PhotoCapture.PhotoCaptureResult result)
{
    if (result.success)
    {
        string filename = string.Format(@"CapturedImage{0}_n.jpg", Time.time);
        string filePath = System.IO.Path.Combine(Application.persistentDataPath, filename);

        photoCaptureObject.TakePhotoAsync(filePath, PhotoCaptureFileOutputFormat.JPG, OnCapturedPhotoToDisk);
    }
    else
    {
        Debug.LogError("Unable to start photo mode!");
    }
}
void OnStoppedPhotoMode(PhotoCapture.PhotoCaptureResult result)
{
    photoCaptureObject.Dispose();
    photoCaptureObject = null;
}

void OnCapturedPhotoToDisk(PhotoCapture.PhotoCaptureResult result)
{
    if (result.success)
    {
        Debug.Log("Saved Photo to disk!");
        photoCaptureObject.StopPhotoModeAsync(OnStoppedPhotoMode);
    }
    else
    {
        Debug.Log("Failed to save Photo to disk");
    }
}

Answer 2

好的，我想问题已经解决了

我尝试了代码形式 'Hernando - MSFT' 但它仍然 return 这两个错误，但是当我打开 Hololens Windows 设备门户并打开项目文件夹时我可以看到图片!!!

我也测试了我的原始代码，它也可以工作。

不知道为什么拍照时总是return这两个错误，但我认为它没有攻击拍照功能。 enter image description here

Unity PhotoCapture return 'No capture devices are available.' Hololens2 上的错误

Unity PhotoCapture return 'No capture devices are available.' ERROR on Hololens2

unity3d

hololens