Unity3D使用C#脚本调用外置摄像头拍摄照片，并转化成byte数组

　　TakePhoto.cs

　　IEnumerator Start() 
　　{
        
        //获取摄像头
        yield return Application.RequestUserAuthorization(UserAuthorization.WebCam);
        if(Application.HasUserAuthorization(UserAuthorization.WebCam))
        {

            WebCamDevice[] devices = WebCamTexture.devices;
            if(devices !=null)
            {
　　　　　　　　　 //获取设备名称
                deviceName = devices[0].name;
                tex = new WebCamTexture(deviceName,400,300,12);
                tex.Play();//建议在需要拍摄照片的时候开启摄像头，不拍摄时将其关闭掉,这里可以使用tex.Pause()暂停摄像头,tex.Stop()关闭摄像头
            }
        }
    }

    //获取像素
    private byte[] GetPhotoPixel(WebCamTexture ca)
    {
        Texture2D texture = new Texture2D (ca.width,ca.height);        
        int y = 0;
        while (y < texture.height)
        {
            int x = 0;
            while (x < texture.width)
            {
                UnityEngine.Color color = ca.GetPixel(x,y);
                texture.SetPixel(x,y,color);
                ++x;
            }
            ++y;
        }
        texture.Apply ();
//        texture.name = name ;
        byte[] pngData = GetJpgData (texture);
        return pngData ;
    }
    //控制照片大小
    private byte[] GetJpgData(Texture2D te)
    {
        byte[] data= null ;
        int quelity = 75 ;
        while(quelity > 20)
        {
            data = te.EncodeToJPG(quelity);
            int size = data.Length/1024;
            if( size > 30 )
            {
                quelity -=5;
            }
            else
            {
                break ;
            }
        }
        return data ;
    }