追蹤播放器中的AVE警告

使用NotificationEvent，您可以追蹤從Adobe視訊引擎(AVE)傳遞的警告。

您的播放器應用程式可追蹤AVE產生的播放警告和錯誤，例如未停止播放且不一定需要應用程式執行任何動作的容錯或網路關閉事件。 雖然TVSDK會處理某些AVE錯誤，但NotificationEvent是您應用程式層的一般傳遞機制，以用於AVE警告。 在收到AVE警告後，您可以選擇採取一些動作，例如主動停止播放、啟動應急計畫、記錄訊息等。

使用下列API元素來追蹤播放器中的AVE警告：

通知代碼

public final class NotificationCode { 
    /** 
     * Warning message for playback status. 
     */ 
    public static const GENERAL_WARNING:int = 101100; 
}

NotificationEvent

/** 
 * Event dispatched by MediaPlayer when a notification is available 
 * for the current media stream being played. 
 */ 
public class NotificationEvent extends Event { 
    /** 
     * Event dispatched when a new warning has been received for the current item. 
     * 
     * The newly created Notification object can be accessed through  
     * the notification property of this event. 
     */ 
    public static const WARNING_AVAILABLE:String = "warningAvailable"; 
    /** 
     * Helper method for creating NotificationEvent events. 
     * Throws an ArgumentError if the specified ad break is null. 
     * @param notification Associated notification object. 
     * 
     * @return a valid notification event instance. 
     */ 
    public static function create( 
           type:String, notification:Notification):NotificationEvent; 
     /** 
     * Default constructor 
     * Throws an ArgumentError if the specified ad break is null. 
     * @param type           Event type. 
     * @param bubbles        Whether the event can bubble up the display list hierarchy. 
     * @param cancelable     Whether the behavior associated with the event can be prevented. 
     * @param notification   Associated notification object. 
     */ 
    public function NotificationEvent(type:String,  
                                      bubbles:Boolean=false,  
                                      cancelable:Boolean=false,  
                                      notification:Notification= null); 
     /** 
     * The notification associated with this event. 
     */ 
    public function get notification():Notification; 
    /** 
     * @inheritDoc 
     */ 
    public override function clone():Event; 
}

將事件偵聽器新增至您的播放器，以擷取AVE警告。

例如：

var _player:DefaultMediaPlayer = new DefaultMediaPlayer(context); 
_player.addEventListener(NotificationEvent.WARNING_AVAILABLE, onWarningAvailable); 
 
private function onWarningAvailable(event:NotificationEvent):void { 
    var metadata:Metadata = event.notification.metadata; 
    if (metadata != null) { 
        for each (var key:String in metadata.keySet()) { 
            var value:String = metadata.getValue(key); 
            if (!StringUtils.isEmpty(key) && !StringUtils.isEmpty(value)) { 
                _logger.warn("#onWarningAvailable metadata [{0}:{1}]", key, value); 
            } 
        } 
    } 
} 

以下是使用NotificationEvent追蹤的AVE警告範例：

[WARN ] [psdkdemo::PSDKDemo] #onWarningAvailable metadata [resourceType:HLS] 
[WARN ] [psdkdemo::PSDKDemo] #onWarningAvailable metadata [resourceId:0] 
[WARN ] [psdkdemo::PSDKDemo] #onWarningAvailable metadata [runtimeCode:66] 
[WARN ] [psdkdemo::PSDKDemo] #onWarningAvailable metadata [runtimeCodeMessage:SEGMENT_SKIPPED_ON_FAILURE] 
[WARN ] [psdkdemo::PSDKDemo] #onWarningAvailable metadata [eventType:Warning] 
 
<pre>
  [WARN ] [psdkdemo::PSDKDemo] #onWarningAvailable metadata [description:url::= 
   https://xyz.corp.adobe.com/pmp/assets/abc/failover/tc.1.04/content/backup-01/ 
   low-res/main-stream4-4x3-info6.ts,periodIndex::=0, 
   sizeBytes::=0,downloadTime(ms)::=0,mediaDuration(ms)::=0] 
</pre>