按照原作者的想法，是可以實現手機觀察到播放封面，但沒法點擊播放。針對這個問題，我翻看了官方論壇，因爲最新的unity包缺少了一個C#文件。把缺少的文件加上，可以實現播放，以下爲詳細說明：
The objective here is to show how to replicate the essence of the Vuforia-VideoPlayback sample scene using the Vuforia prefabs and the drag and drop approach of Unity:
- Create a new Unity project
- Import the Vuforia video playback unity package
- Create a new scene
- Drag the ARCamera prefab into the Unity scene
- Under the DataSetLoadBehaviour in the Inspector tick “Load Data Set StonesAndChips”, and the 'Activate' checkbox below this
- From '/Qualcomm AugmentedReality/Prefabs' drag the ImageTarget prefab into the scene
- For the Image Target select “StonesAndChips” as the dataset and the Image Target should change to the Stones texture
- From Vuforia Video Playback/Prefabs drag the Video prefab to be the child of the Image Target
- In the Inspector under “Video Playback Behaviour (Script)” set the path to 'VuforiaSizzleReel_1.m4v'
- Drag the TrackableEventHandler from Scripts to the Image Target (this plays the video)
- Remove the DefaultTrackableEventHandler script from the Image Target as it is not needed.
- Autoplay works already, however tapping the video does not yet work. In order to fix this, simply create a VideoPlaybackController script, fill it with the code below, and then attach this to the ARCamera.
大概意思就是（我英語不好，懂意思就好= =#，英語好的還是讀上文吧）：
- 創建一個新的Unity工程
- 引入Vuforia video playback的unity包
- 創建一個新的場景
- 拖ARCamera進場景（ARCamera搜索下很好找到）
- 點擊場景中的ARCamera，右邊Inspector欄目，DataSetLoadBehaviour（script）中“Load Data Set StonesAndChips”和 'Activate'都打上勾
- 從'/Qualcomm AugmentedReality/Prefabs'目錄中Image Target拖入場景，右邊Data Set選擇“StonesAndChips”
- 從“Vuforia Video Playback/Prefabs”目錄中Video拖入場景，右邊“Video Playback Behaviour (Script)”中path欄輸入'VuforiaSizzleReel_1.m4v'（測試是播放這個視頻），或者也可以使用
這個網絡視頻進行測試http://oneshot.qualcomm.com/webAR/content/strawberryfields_H264_AAC.mp4 - 把TrackableEventHandler這個C#文件放到Image Target中，主要是用來播放視頻的
- 從Image Target中移除DefaultTrackableEventHandler這個文件的使用，因爲這個文件根本不需要，移除的話其實把它的打勾去掉也可以
- 自動播放要不要打上勾隨自己需要，
創建VideoPlaybackController的C#文件放入ARCamera中，
VideoPlaybackController中的代碼如下：
創建VideoPlaybackController的C#文件放入ARCamera中，
VideoPlaybackController中的代碼如下：/*==============================================================================
Copyright (c) 2012-2014 Qualcomm Connected Experiences, Inc.
All Rights Reserved.
This Vuforia(TM) sample application in source code form ("Sample Code") for the
Vuforia Software Development Kit and/or Vuforia Extension for Unity
(collectively, the "Vuforia SDK") may in all cases only be used in conjunction
with use of the Vuforia SDK, and is subject in all respects to all of the terms
and conditions of the Vuforia SDK License Agreement, which may be found at
<a title="https://developer.vuforia.com/legal/license" href="https://developer.vuforia.com/legal/license">https://developer.vuforia.com/legal/license</a>.
By retaining or using the Sample Code in any manner, you confirm your agreement
to all the terms and conditions of the Vuforia SDK License Agreement. If you do
not agree to all the terms and conditions of the Vuforia SDK License Agreement,
then you may not retain or use any of the Sample Code in any manner.
==============================================================================*/
using UnityEngine;
using System.Collections;
/// <summary>
/// This class contains the logic to handle taps on VideoPlaybackBehaviour game objects
/// and starts playing the according video. It also pauses other videos when a new one is
/// started.
/// </summary>
public class VideoPlaybackController : MonoBehaviour
{
#region PRIVATE_MEMBER_VARIABLES
private Vector2 mTouchStartPos;
private bool mTouchMoved = false;
private float mTimeElapsed = 0.0f;
private bool mTapped = false;
private float mTimeElapsedSinceTap = 0.0f;
private bool mWentToFullScreen = false;
#endregion // PRIVATE_MEMBER_VARIABLES
#region UNITY_MONOBEHAVIOUR_METHODS
void Update()
{
// Determine the number of taps
// Note: Input.tapCount doesn't work on Android
if (Input.touchCount > 0)
{
Touch touch = Input.touches[0];
if (touch.phase == TouchPhase.Began)
{
mTouchStartPos = touch.position;
mTouchMoved = false;
mTimeElapsed = 0.0f;
}
else
{
mTimeElapsed += Time.deltaTime;
}
if (touch.phase == TouchPhase.Moved)
{
if (Vector2.Distance(mTouchStartPos, touch.position) > 40)
{
// Touch moved too far
mTouchMoved = true;
}
}
else if (touch.phase == TouchPhase.Ended)
{
if (!mTouchMoved && mTimeElapsed < 1.0)
{
if (mTapped)
{
// Second tap
HandleDoubleTap();
mTapped = false;
}
else
{
// Wait to see if this is a double tap
mTapped = true;
mTimeElapsedSinceTap = 0.0f;
}
}
}
}
if (mTapped)
{
if (mTimeElapsedSinceTap >= 0.5f)
{
// Not a double tap
HandleTap();
mTapped = false;
}
else
{
mTimeElapsedSinceTap += Time.deltaTime;
}
}
// special handling in play mode:
if (QCARRuntimeUtilities.IsPlayMode())
{
if (Input.GetMouseButtonUp(0))
{
if (PickVideo(Input.mousePosition) != null)
Debug.LogWarning("Playing videos is currently not supported in Play Mode.");
}
}
}
#endregion // UNITY_MONOBEHAVIOUR_METHODS
#region PRIVATE_METHODS
/// <summary>
/// Handle single tap event
/// </summary>
private void HandleTap()
{
// Find out which video was tapped, if any
VideoPlaybackBehaviour video = PickVideo(mTouchStartPos);
if (video != null)
{
if (video.VideoPlayer.IsPlayableOnTexture())
{
// This video is playable on a texture, toggle playing/paused
VideoPlayerHelper.MediaState state = video.VideoPlayer.GetStatus();
if (state == VideoPlayerHelper.MediaState.PAUSED ||
state == VideoPlayerHelper.MediaState.READY ||
state == VideoPlayerHelper.MediaState.STOPPED)
{
// Pause other videos before playing this one
PauseOtherVideos(video);
// Play this video on texture where it left off
video.VideoPlayer.Play(false, video.VideoPlayer.GetCurrentPosition());
}
else if (state == VideoPlayerHelper.MediaState.REACHED_END)
{
// Pause other videos before playing this one
PauseOtherVideos(video);
// Play this video from the beginning
video.VideoPlayer.Play(false, 0);
}
else if (state == VideoPlayerHelper.MediaState.PLAYING)
{
// Video is already playing, pause it
video.VideoPlayer.Pause();
}
}
else
{
// Display the busy icon
video.ShowBusyIcon();
// This video cannot be played on a texture, play it full screen
video.VideoPlayer.Play(true, 0);
mWentToFullScreen = true;
}
}
}
/// <summary>
/// Handle double tap event
/// </summary>
private void HandleDoubleTap()
{
// Find out which video was tapped, if any
VideoPlaybackBehaviour video = PickVideo(mTouchStartPos);
if (video != null)
{
if (video.VideoPlayer.IsPlayableFullscreen())
{
// Pause the video if it is currently playing
video.VideoPlayer.Pause();
// Seek the video to the beginning();
video.VideoPlayer.SeekTo(0.0f);
// Display the busy icon
video.ShowBusyIcon();
// Play the video full screen
video.VideoPlayer.Play(true, 0);
mWentToFullScreen = true;
}
}
}
/// <summary>
/// Find the video object under the screen point
/// </summary>
private VideoPlaybackBehaviour PickVideo(Vector3 screenPoint)
{
VideoPlaybackBehaviour[] videos = (VideoPlaybackBehaviour[])
FindObjectsOfType(typeof(VideoPlaybackBehaviour));
Ray ray = Camera.main.ScreenPointToRay(screenPoint);
RaycastHit hit = new RaycastHit();
foreach (VideoPlaybackBehaviour video in videos)
{
if (video.collider.Raycast(ray, out hit, 10000))
{
return video;
}
}
return null;
}
/// <summary>
/// Pause all videos except this one
/// </summary>
private void PauseOtherVideos(VideoPlaybackBehaviour currentVideo)
{
VideoPlaybackBehaviour[] videos = (VideoPlaybackBehaviour[])
FindObjectsOfType(typeof(VideoPlaybackBehaviour));
foreach (VideoPlaybackBehaviour video in videos)
{
if (video != currentVideo)
{
if (video.CurrentState == VideoPlayerHelper.MediaState.PLAYING)
{
video.VideoPlayer.Pause();
}
}
}
}
#endregion // PRIVATE_METHODS
#region PUBLIC_METHODS
/// <summary>
/// One-time check for the Instructional Screen
/// </summary>
public bool CheckWentToFullScreen()
{
bool result = mWentToFullScreen;
mWentToFullScreen = false;
return result;
}
#endregion // PUBLIC_METHODS
}
手機判別圖片後點擊播放鍵，開始播放視頻，大概就是上圖這個樣子。