private int GetSegmentIndex(TimeSpan pointInTime)
{
if (Count == 0)
{
return(-1);
}
var searcher = new TimelineSearchStartTimeDuration();
TimelineItemRep lookFor = new TimelineItemRep
{
TimeScaled = pointInTime
};
var idx = Array.BinarySearch(timelineAll, timelineAvailable.Offset, timelineAvailable.Count,
lookFor, searcher);
if (idx < 0)
{
Logger.Error($"Failed to find segment in @time. FA={timeline[0].TimeScaled} Req={pointInTime} LA={timeline[(int)Count - 1].TimeScaled}");
}
// Index Search is based on timelineAll. Access is done on timeline thus offset subtraction
// In fail case, simply larger negative value will be returned.
//
return(idx - timelineAvailable.Offset);
}
private uint?GetStartSegmentDynamicFromTimeline()
{
var maxRange = timeline.Count;
if (maxRange == 0)
{
return(null);
}
maxRange -= 1;
var timeShiftBufferDepth = parameters.Document.TimeShiftBufferDepth ?? TimeSpan.Zero;
// Start by Time is calculated as:
// Start Segment Time = Representation Start Time +
// First available segment - First segment in playlist +
// 1/4*timeShiftBufferDepth
//
// This implies that MAX buffer time for dynamic content is 3/4*timeShiftBufferDepth
//
var startTime = timeline[0].TimeScaled;
startTime += TimeSpan.FromSeconds(timeShiftBufferDepth.TotalSeconds / 4);
var searcher = new TimelineSearchStartTimeDuration();
TimelineItemRep lookFor = new TimelineItemRep
{
TimeScaled = startTime
};
var idx = Array.BinarySearch(timelineAll, 0, timelineAll.Length,
lookFor, searcher);
if (idx < 0)
{
var last = timelineAll.Length - 1;
Logger.Error($"Failed to find start segment @time. FAll={timelineAll[0].Number}/{timelineAll[0].TimeScaled} T={startTime} LAll={timelineAll[last].Number}/{timelineAll[last].TimeScaled}");
return(null);
}
// Sanity check for availability
if (timelineAll[idx].TimeToLive == TimeSpan.Zero)
{
var last = timelineAll.Length - 1;
Logger.Error($"Start segment found {timelineAll[idx].Number} is unavailable FAll={timelineAll[0].Number}/{timelineAll[0].TimeScaled} T={startTime} TTL={timelineAll[idx].TimeToLive} LAll={timelineAll[last].Number}/{timelineAll[last].TimeScaled}");
return(null);
}
return((uint?)timelineAll[idx].Number);
}
