easyar unity3d播放视频

  public class ImageTarget_DynamicLoad_ManualPlay : ImageTargetBehaviour    {        private bool loaded;        private bool found;        private System.EventHandler videoReayEvent;        private VideoPlayerBaseBehaviour videoPlayer;        private string video = "transparentvideo.mp4";        protected override void Awake()        {            base.Awake();            TargetFound += OnTargetFound;            TargetLost += OnTargetLost;            TargetLoad += OnTargetLoad;            TargetUnload += OnTargetUnload;        }        protected override void Start()        {            videoReayEvent = OnVideoReady;            base.Start();            LoadVideo();        }        public void LoadVideo()        {            GameObject subGameObject = Instantiate(Resources.Load("TransparentVideo", typeof(GameObject))) as GameObject;            subGameObject.transform.parent = this.transform;            subGameObject.transform.localPosition = new Vector3(0, 0.1f, 0);            subGameObject.transform.localRotation = new Quaternion();            subGameObject.transform.localScale = new Vector3(0.5f, 0.2f, 0.3154205f);            videoPlayer = subGameObject.GetComponent<VideoPlayerBaseBehaviour>();            if (videoPlayer)            {                videoPlayer.Storage = StorageType.Assets;                videoPlayer.Path = video;                videoPlayer.EnableAutoPlay = false;                videoPlayer.EnableLoop = true;                videoPlayer.Type = VideoPlayerBaseBehaviour.VideoType.TransparentSideBySide;                videoPlayer.VideoReadyEvent += videoReayEvent;                videoPlayer.Open();            }        }        public void UnLoadVideo()        {            if (!videoPlayer)                return;            videoPlayer.VideoReadyEvent -= videoReayEvent;            videoPlayer.Close();            loaded = false;        }        void OnVideoReady(object sender, System.EventArgs e)        {            Debug.Log("Load video success");            VideoPlayerBaseBehaviour player = sender as VideoPlayerBaseBehaviour;            loaded = true;            if (player && found)                player.Play();        }        void OnTargetFound(TargetAbstractBehaviour behaviour)        {            found = true;            if (videoPlayer && loaded)                videoPlayer.Play();            Debug.Log("Found: " + Target.Id);        }        void OnTargetLost(TargetAbstractBehaviour behaviour)        {            found = false;            if (videoPlayer && loaded)                videoPlayer.Pause();            Debug.Log("Lost: " + Target.Id);        }        void OnTargetLoad(ImageTargetBaseBehaviour behaviour, ImageTrackerBaseBehaviour tracker, bool status)        {            Debug.Log("Load target (" + status + "): " + Target.Id + " (" + Target.Name + ") " + " -> " + tracker);        }        void OnTargetUnload(ImageTargetBaseBehaviour behaviour, ImageTrackerBaseBehaviour tracker, bool status)        {            Debug.Log("Unload target (" + status + "): " + Target.Id + " (" + Target.Name + ") " + " -> " + tracker);        }    }}

这张图中对应的ImageTarget-StreamingVideo-DynamicLoad中的一个组件是ImageTarget_DynamicLoad_ManualPlay，代码就是上面的代码。会看到里面有 path name storage等属性,这些属性是被ImageTargetBehaviour暴露出来的。
有注意到ImageTarget-StreamingVideo-DynamicLoad 这个gameObject下面没有追踪的对象，那这个对象是怎么添加的。答案就是ImageTarget_DynamicLoad_ManualPlay脚本的组件中动态加载的，可以看上面的代码。

在ImageTarget_DynamicLoad_ManualPlay脚本的代码中，看到有
videoPlayer = subGameObject.GetComponent<VideoPlayerBaseBehaviour>();
这个方法是获取一个videoPlayer组件，注意这个方法是GetComponent，既然是getxxx，那么gameObject中肯定会有这个组件，上图中左红箭头，可以看到确实有这个组件。

动态加载GameObject

//=============================================================================================================================//// Copyright (c) 2015-2017 VisionStar Information Technology (Shanghai) Co., Ltd. All Rights Reserved.// EasyAR is the registered trademark or trademark of VisionStar Information Technology (Shanghai) Co., Ltd in China// and other countries for the augmented reality technology developed by VisionStar Information Technology (Shanghai) Co., Ltd.////=============================================================================================================================using UnityEngine;using EasyAR;namespace EasyARSample{    public class HelloARVideo : MonoBehaviour    {        private const string title = "Please enter KEY first!";        private const string boxtitle = "===PLEASE ENTER YOUR KEY HERE===";        private const string keyMessage = ""            + "Steps to create the key for this sample:\n"            + "  1. login www.easyar.com\n"            + "  2. create app with\n"            + "      Name: HelloARVideo (Unity)\n"            + "      Bundle ID: cn.easyar.samples.unity.helloarvideo\n"            + "  3. find the created item in the list and show key\n"            + "  4. replace all text in TextArea with your key";        private ImageTarget_DynamicLoad_ManualPlay target;        private void Awake()        {            if (FindObjectOfType<EasyARBehaviour>().Key.Contains(boxtitle))            {#if UNITY_EDITOR                UnityEditor.EditorUtility.DisplayDialog(title, keyMessage, "OK");#endif                Debug.LogError(title + " " + keyMessage);            }        }        private void Start()        {            if (!target)            {                GameObject go = new GameObject("ImageTarget-TransparentVideo-DynamicLoad");                target = go.AddComponent<ImageTarget_DynamicLoad_ManualPlay>();            }            target.ActiveTargetOnStart = false;            target.Bind(ARBuilder.Instance.ImageTrackerBehaviours[0]);            target.SetupWithImage("idback.jpg", EasyAR.StorageType.Assets, "idback", new Vector2(8.56f, 5.4f));        }        private void OnDestory()        {            if (!target)                return;            target.Bind(null);        }    }}

这个画面中会加载上面的脚本，上面脚本中会动态创建一个类型为ImageTarget-TransparentVideo-DynamicLoad的gameObject
如下：

 GameObject go = new GameObject("ImageTarget-TransparentVideo-DynamicLoad");

然后再添加一个组件ImageTarget_DynamicLoad_ManualPlay，代码如下：

target = go.AddComponent<ImageTarget_DynamicLoad_ManualPlay>();

这次为什么是AddComponent而不是GetComponent？
很明显因为这次是完全动态创建gameObject，上一个是gameObject存在，而且里面也有一个component，所以上一个不用add了，直接get就行了。
接下来配置这个组件：

target.ActiveTargetOnStart = false;         //绑定tracker，不然没法追踪识别图片。   target.Bind(ARBuilder.Instance.ImageTrackerBehaviours[0]);            target.SetupWithImage("idback.jpg", EasyAR.StorageType.Assets, "idback", new Vector2(8.56f, 5.4f));

剩下的事就是ImageTarget_DynamicLoad_ManualPlay脚本来处理了。

上面的事情做完后，tracker就会去追踪camera，如果识别出来了配置的图片，就会调用ImageTarget_DynamicLoad_ManualPlay中的OnTargetFound，然后就会播放视频了。