Create a custom opportunity detector

The custom opportunity detector is a class that monitors the playback timeline and detects ad placement opportunities.

#EXT-X-CUE:TYPE=SpliceOut,ID=7687, TIME=578123.41,DURATION=30.0,AVAIL-NUM=0,AVAILS-EXPECtED=0, PROGRAM-ID=0

1. Add the following code:

   public class CustomPlacementOpportunityDetector implements PlacementOpportunityDetector {
   	// ...
   
   	@Override
   	public List<PlacementOpportunity> process(List<TimedMetadata> timedMetadataList, Metadata metadata) {
   		PMPDemoApp.logger.i(LOG_TAG + "#process", "Processing ["
   			+ timedMetadataList.size()
   			+ "] timed metadata, in order to provide placement opportunities.");
   		List<PlacementOpportunity> opportunities = new ArrayList<PlacementOpportunity>();
   
   		for (TimedMetadata timedMetadata : timedMetadataList) {
   			if (isPlacementOpportunity(timedMetadata)) {
   				boolean shouldProcessTimedMetadata = timedMetadata.getTime() > _timeOfLastDetectedOpportunity;
   			if (shouldProcessTimedMetadata) {
   				_timeOfLastDetectedOpportunity = timedMetadata.getTime();
   
   			// The airingId (CAID) is in another tag. Iterate through the timedMetadata list and find
   			// the CAID associated with this ad cue point.
   
   			String airingId = getAiringIdForTime(timedMetadata.getTime(), timedMetadataList);
   			PlacementOpportunity opportunity = createPlacementOpportunity(timedMetadata, airingId, metadata);

2. Also add:

   if (opportunity != null) {
   		PMPDemoApp.logger.i(LOG_TAG + "#process", "Created new placement opportunity at time "
   			+ opportunity.getPlacementInformation().getTime()
   			+ ", with a duration of "
   			+ opportunity.getPlacementInformation().getDuration()
   			+ "ms.");
   		opportunities.add(opportunity);
   	} else {
   		PMPDemoApp.logger.w(LOG_TAG + "#process", "Ad placement opportunity creation has failed. Probably has invalid metadata."
   			+ " opportunity time = " + String.valueOf(timedMetadata.getTime())
   			+ ", metadata: " + timedMetadata.getMetadata()
   			+ ", processing time = " + String.valueOf(_timeOfLastDetectedOpportunity) +
   			"].");
   		}
   	} else {
   		PMPDemoApp.logger.w(LOG_TAG + "#process", "Ad placement opportunity
   			skipped. It was either already processed or its position is in the past (previous to the play
   			head). 
   			[" + " opportunity time= " + String.valueOf(timedMetadata.getTime()) +
   			", processing time=" + String.valueOf(_timeOfLastDetectedOpportunity) +
   			"].");
   			}
   		}
   	}
   }