Question

我正在尝试将VAST视频前贴片广告添加到SThree sample Roku SDK project（“带视频和详细信息的简单网格（.zip）”版本）。

我可以通过将以下代码放入main.brs：

来启动应用程序启动

library "Roku_Ads.brs"
...
Sub RunUserInterface()
    ...
    raf = Roku_Ads() 
    raf.setAdPrefs(false)       'disable back-filled ads
    raf.setDebugOutput(true)
    raf.setAdUrl("http://pubads.g.doubleclick.net/gampad/ads?slotname=/82114269/Video/fallbacktest&sz=1920x1080&url=[http://roku.com&unviewed_position_start=1&output=vast&impl=s&env=vp&gdfp_req=1&ad_rule=0&description_url=http%3A%2F%2Fapps.roku.com&vad_type=linear&sdkv=roku&min_ad_duration=0&max_ad_duration=60000&rdid=ROKU_ADS_TRACKING_ID&is_lat=ROKU_ADS_LIMIT_TRACKING&idtype=rida&correlator=ROKU_ADS_TIMESTAMP&scor=ROKU_ADS_TIMESTAMP&pod=POD_NUM&ppos=POD_POSITION&cust_params=genre%3DROKU_ADS_CONTENT_GENRE%26ua%3DROKU_ADS_USER_AGENT%26ai%3DROKU_ADS_APP_ID]http://roku.com&unviewed_position_start=1&output=vast&impl=s&env=vp&gdfp_req=1&ad_rule=0&description_url=http%3A%2F%2Fapps.roku.com&vad_type=linear&sdkv=roku&min_ad_duration=0&max_ad_duration=60000&rdid=ROKU_ADS_TRACKING_ID&is_lat=ROKU_ADS_LIMIT_TRACKING&idtype=rida&correlator=ROKU_ADS_TIMESTAMP&scor=ROKU_ADS_TIMESTAMP&pod=POD_NUM&ppos=POD_POSITION&cust_params=genre%3DROKU_ADS_CONTENT_GENRE%26ua%3DROKU_ADS_USER_AGENT%26ai%3DROKU_ADS_APP_ID") 
    adPods = raf.getAds()
    shouldPlayContent = raf.showAds(adPods)

但我不想在启动时播放广告，我想在视频播放之前播放广告。所以我想我可以将上面的行添加到components/screens/DetailsScreen/DetailsScreen.brs：

' on Button press handler
Sub onItemSelected()
    ' first button is Play
    if m.top.itemSelected = 0
        'START ADDING FOR PRE-ROLL
        raf = Roku_Ads() 
        raf.setAdPrefs(false)       'disable back-filled ads
        raf.setDebugOutput(true)
        raf.setAdUrl("http://pubads.g.doubleclick.net/gampad/ads?slotname=/82114269/Video/fallbacktest&sz=1920x1080&url=[http://roku.com&unviewed_position_start=1&output=vast&impl=s&env=vp&gdfp_req=1&ad_rule=0&description_url=http%3A%2F%2Fapps.roku.com&vad_type=linear&sdkv=roku&min_ad_duration=0&max_ad_duration=60000&rdid=ROKU_ADS_TRACKING_ID&is_lat=ROKU_ADS_LIMIT_TRACKING&idtype=rida&correlator=ROKU_ADS_TIMESTAMP&scor=ROKU_ADS_TIMESTAMP&pod=POD_NUM&ppos=POD_POSITION&cust_params=genre%3DROKU_ADS_CONTENT_GENRE%26ua%3DROKU_ADS_USER_AGENT%26ai%3DROKU_ADS_APP_ID]http://roku.com&unviewed_position_start=1&output=vast&impl=s&env=vp&gdfp_req=1&ad_rule=0&description_url=http%3A%2F%2Fapps.roku.com&vad_type=linear&sdkv=roku&min_ad_duration=0&max_ad_duration=60000&rdid=ROKU_ADS_TRACKING_ID&is_lat=ROKU_ADS_LIMIT_TRACKING&idtype=rida&correlator=ROKU_ADS_TIMESTAMP&scor=ROKU_ADS_TIMESTAMP&pod=POD_NUM&ppos=POD_POSITION&cust_params=genre%3DROKU_ADS_CONTENT_GENRE%26ua%3DROKU_ADS_USER_AGENT%26ai%3DROKU_ADS_APP_ID") 
        adPods = raf.getAds()
        shouldPlayContent = raf.showAds(adPods)
        'END ADDING FOR PRE-ROLL

        if shouldPlayContent
            m.videoPlayer.visible = true
            m.videoPlayer.setFocus(true)
            m.videoPlayer.control = "play"
            m.videoPlayer.observeField("state", "OnVideoPlayerStateChange")
        end if
    end if
End Sub

当我运行时，我收到一个错误：

Roku_Ads Framework version 1.8
BRIGHTSCRIPT: ERROR: roAppInfo: class PLUGIN|MARKUP on thread RENDER: roku_ads_lib:/Roku_Ads.brs(527)
'Dot' Operator attempted with invalid BrightScript Component or interface reference. (runtime error &hec) in roku_ads_lib:/Roku_Ads.brs(528)
528: ??
Backtrace:
#4  Function roku_ads_util_getappid(key_ As String) As String
   file/line: roku_ads_lib:/Roku_Ads.brs(528)
#3  Function roku_ads_checkallowedfeature(keytype_ As String, util_ As Object) As Boolean
   file/line: roku_ads_lib:/Roku_Ads.brs(1287)
#2  Function roku_ads_constructor() As Object
   file/line: roku_ads_lib:/Roku_Ads.brs(264)
#1  Function roku_ads() As Object
   file/line: roku_ads_lib:/Roku_Ads.brs(32)
#0  Function onitemselected() As Void
   file/line: pkg:/components/screens/DetailsScreen/DetailsScreen.brs(75)

我在这里做错了什么？从component.xml中的onChange="onItemSelected"调用方法时，您是否可以播放广告？

更新：Eugene的answer below是正确的，以下是我解决问题的方法：

了解scene graph threads，events和handling application events。完成后，在Render线程和主线程之间传递数据时读取this post。您需要了解scene graph data scoping。

基本上，您会观察itemSelected中的components/screens/DetailsScreen/DetailsScreen.xml字段：

m.DetailsScreen = scene.findNode("DetailsScreen")
m.DetailsScreen.observeField("itemSelected", m.port)

然后在主线程事件循环中处理roSGNodeEvent：

while true
    msg = wait(0, m.port)        
    msgType = type(msg)

    ? ">>>Main Thread Msg: ";msgType

    if msgType = "roSGScreenEvent"
        if msg.isScreenClosed() then return
    else if msgType = "roSGNodeEvent"
        fieldName = msg.getField()
        fieldData = msg.getData()
        ? "> node: "; msg.getNode()
        ? "> field name: "; fieldName
        ? "> data: "; fieldData

        if (fieldName = "itemSelected" and fieldData = 0)   'User pressed play
            'wait for 0.5 second before proceeding to RAF
            sleep(500)
            PlayAd()
        endif
    end if
end while

PlayAd()设置m.DetailsScreen.videoPlayerVisible = true如果没有广告或广告已完成播放。这会导致onVideoVisibleChange

中调用components/screens/DetailsScreen/DetailsScreen.brs

Answer 1

您无法在渲染线程中使用RAF。您必须将事件发送到主线程并在那里显示广告。您可以在Scene Graph here中找到RAF积分的样本。有关Scene Graph中线程的更多信息，请参见here。

无法在Roku中播放视频前贴片广告

1 个答案: