Question by fpoiesi · Jan 07, 2019 at 12:26 PM · android camera script.

Get Android camera snapshots without freezing preview

Hi,

I am trying to get snapshots from the Android Camera without having the preview video of the camera freezing every time a snapshot is taken. I implemented this approach to read the video stream from the Camera (https://www.youtube.com/watch?v=c6NXkZWXHnc) and my implementation to take snapshot can be found here below. I also tried to wrap the method Snap() inside an 'async' method using await and Task.Run(), but the app crashes.

Can someone suggest a way to have the camera preview running smoothly while taking snashots and processing them?

 public class PhoneCamera : MonoBehaviour {    
     private bool cameraAvailable;
     private WebCamTexture backCamera;
     private Texture defaultBackground;
     Texture2D snap;    
     public RawImage background;
     public AspectRatioFitter fit; // functions as a layout controller that controls the size of its own layout element

     void Start ()
     {
         defaultBackground = background.texture;
         WebCamDevice[] devices = WebCamTexture.devices;
         if (devices.Length == 0)
         {
             Debug.Log("No camera detected");
             cameraAvailable = false;
             return;
         }
         for (int i = 0; i <devices.Length; i++)
             if (!devices[i].isFrontFacing)
                 backCamera = new WebCamTexture(devices[i].name, Screen.width, Screen.height);
         if (backCamera == null)
         {
             Debug.Log("Unable to find back camera");
             return;
         }
         backCamera.Play();
         background.texture = backCamera;
         cameraAvailable = true;
         snap = new Texture2D(backCamera.width, backCamera.height);
 
         InvokeRepeating(nameof(Snap), 1f, 1f);
     }
     
 
     void Update ()
     {
         if (!cameraAvailable) return;
         float ratio = (float)backCamera.width / (float)backCamera.height;
         fit.aspectRatio = ratio;
         float scaleY = backCamera.videoVerticallyMirrored ? -1f : 1f;
         background.rectTransform.localScale = new Vector3(1f, scaleY, 1f);
         int orient = - backCamera.videoRotationAngle;
         background.rectTransform.localEulerAngles = new Vector3(0, 0, orient);
     }
 
     private void Snap()
     {
         snap.SetPixels(backCamera.GetPixels());
         snap.Apply();
     }
 }

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