不再捕获检测到的图像时停止播放视频答案

【问题标题】：Stop playing video when detected image is not captured anymore不再捕获检测到的图像时停止播放视频
【发布时间】：2019-07-17 14:00:38
【问题描述】：

我正在创建一个 AR 应用来检测立方体上的图像（立方体上打印了 6 张图像）。根据检测到的图像，正在播放相关视频。不幸的是，即使识别出另一张图片，AVplayer 也不会停止播放视频 --> 可能会同时播放多个视频（对视频来说不是超级糟糕，但尤其是重叠的音频太可怕了）。

我的假设是，以下函数实际上会停止当前播放的视频，但没有任何反应 --> 即使相机不再捕获立方体，音频也会继续。

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    let configuration = ARImageTrackingConfiguration()

    if let trackedImages = ARReferenceImage.referenceImages(inGroupNamed: "ARImages", bundle: Bundle.main) {

        configuration.trackingImages = trackedImages
        configuration.maximumNumberOfTrackedImages = 6
    }

    sceneView.session.run(configuration)
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)

    sceneView.session.pause()
    //sceneView?.removeFromSuperview()
}

    func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {

    guard let imageAnchor = anchor as? ARImageAnchor,
        let name = imageAnchor.referenceImage.name,
        let fileUrlString = Bundle.main.path(forResource: name, ofType: "mp4") else {return}

    let videoItem = AVPlayerItem(url: URL(fileURLWithPath: fileUrlString))

    let player = AVPlayer(playerItem: videoItem)
    let videoNode = SKVideoNode(avPlayer: player)

    player.play()
    NotificationCenter.default.addObserver(forName: .AVPlayerItemDidPlayToEndTime, object: player.currentItem, queue: nil) { (notification) in
        player.seek(to: CMTime.zero)
        player.play()

    }

    let videoScene = SKScene(size: CGSize(width: 960, height: 720))
    videoNode.position = CGPoint(x: videoScene.size.width / 2, y: videoScene.size.height / 2)
    videoNode.yScale = -1.0
    videoScene.addChild(videoNode)
    let plane = SCNPlane(width: imageAnchor.referenceImage.physicalSize.width, height: imageAnchor.referenceImage.physicalSize.height)
    plane.firstMaterial?.diffuse.contents = videoScene
    let planeNode = SCNNode(geometry: plane)
    planeNode.eulerAngles.x = -Float.pi / 2
    node.addChildNode(planeNode)
}

有没有人知道如何调用“player.pause()”或“player.stop()”函数在不再检测到捕获的图像时停止播放视频？

感谢您的支持！

【问题讨论】：

你需要替换AVPlayer中的视频，我就是这么做的。可以看看添加视频的代码吗？
嗨，Alok，我将代码添加到原始帖子中。

标签： ios swift xcode arkit

【解决方案1】：

抱歉，我没有检查音频（不知何故我的设备停止播放音频）。您有不同的 AVPlayer 实例为不同的图像节点播放视频。所以我只是把它们拿出来，这样同一个播放器就会有不同节点的新视频

var player = AVPlayer()
var videoScene: SKScene!
var videoNode: SKVideoNode!
var url: String!

func setupVideoNode(){
    videoNode = SKVideoNode(avPlayer: player)

    player.play()
    NotificationCenter.default.addObserver(forName: .AVPlayerItemDidPlayToEndTime, object: player.currentItem, queue: nil) { (notification) in
        self.player.seek(to: CMTime.zero)
        self.player.play()

    }
    videoScene = SKScene(size: CGSize(width: 960, height: 720))
    videoNode.position = CGPoint(x: videoScene.size.width / 2, y: videoScene.size.height / 2)
    videoNode.yScale = -1.0
    videoScene.addChild(videoNode)
}

func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {

    guard let imageAnchor = anchor as? ARImageAnchor,
        let name = imageAnchor.referenceImage.name,
        let fileUrlString = Bundle.main.path(forResource: name, ofType: "mp4") else {return}
        url = fileUrlString

    let videoItem = AVPlayerItem(url: URL(fileURLWithPath: fileUrlString))

    player.replaceCurrentItem(with: videoItem) //= AVPlayer(playerItem: videoItem)

    setupVideoNode()

    let plane = SCNPlane(width: imageAnchor.referenceImage.physicalSize.width, height: imageAnchor.referenceImage.physicalSize.height)
    plane.firstMaterial?.diffuse.contents = videoScene
    let planeNode = SCNNode(geometry: plane)
    planeNode.eulerAngles.x = -Float.pi / 2
    node.addChildNode(planeNode)
}

func renderer(_ renderer: SCNSceneRenderer, didUpdate node: SCNNode, for anchor: ARAnchor) {
    guard let imageAnchor = anchor as? ARImageAnchor,
        let name = imageAnchor.referenceImage.name,
        let fileUrlString = Bundle.main.path(forResource: name, ofType: "mp4") else {return}

    if url == fileUrlString{
        return
    }
    url = fileUrlString
    let videoItem = AVPlayerItem(url: URL(fileURLWithPath: fileUrlString))
    player.replaceCurrentItem(with: videoItem)
    player.play()
}

【讨论】：