private static void CheckTimelineCoverage(SegmentTemplate template, DateTimeOffset windowStart, DateTimeOffset windowEnd, string path, IFeedbackSink feedback)
{
var period = template.ResolveAdaptationSet().Period;
var periodTimingString = $"The period lasts from {period.Start.ToTimeStringAccurate()} to {(period.End ?? windowEnd).ToTimeStringAccurate()}.";
var contentExistsUpTo = period.Start;
// Skip until playback window start. This may even mean skipping the entire period.
if (windowStart > contentExistsUpTo)
{
feedback.Info("Skipping data that lies before the playback window start.");
contentExistsUpTo = windowStart;
}
var ignoredPastSegments = 0;
var ignoredFutureSegments = 0;
foreach (var segment in template.Segments)
{
// If it is entirely in the past, skip it.
if (segment.End <= contentExistsUpTo)
{
ignoredPastSegments++;
continue;
}
// If it leaves a gap, scream.
if (segment.Start > contentExistsUpTo)
{
var gapLength = segment.Start - contentExistsUpTo;
var playbackWindowStartString = contentExistsUpTo == windowStart ? " This gap is at the start of the playback window." : "";
feedback.InvalidContent($"There is a gap of {gapLength.TotalMilliseconds:F1} ms from {contentExistsUpTo.ToTimeStringAccurate()} to {segment.Start.ToTimeStringAccurate()} in {path}. {periodTimingString}{playbackWindowStartString}");
}
// If the segment is entirely in the future, skip it.
// This can be either because this period was cut short by a new period
// or because this is the last period and the described segment is not available yet.
if (segment.Start > (period.End ?? windowEnd))
{
ignoredFutureSegments++;
continue;
}
// Mark as contentful time segment.
contentExistsUpTo = segment.End;
// If we overshot period end, clip back.
if (period.End.HasValue && contentExistsUpTo > period.End)
{
contentExistsUpTo = period.End.Value;
}
}
if (period.End.HasValue)
{
// Make sure we covered the period until the end if we know its end.
if (contentExistsUpTo != period.End.Value)
{
var gapLength = period.End.Value - contentExistsUpTo;
feedback.InvalidContent($"There is a gap of {gapLength.TotalMilliseconds:F1} ms from {contentExistsUpTo.ToTimeStringAccurate()} to {period.End.Value.ToTimeStringAccurate()} in {path}. {periodTimingString} This gap is at the end of the period.");
}
}
else
{
// Make sure we covered the period until playback window end if we do not know period end.
if (contentExistsUpTo < windowEnd)
{
var gapLength = windowEnd - contentExistsUpTo;
feedback.InvalidContent($"There is a gap of {gapLength.TotalMilliseconds:F1} ms from {contentExistsUpTo.ToTimeStringAccurate()} to {windowEnd.ToTimeStringAccurate()}. {periodTimingString} This gap is at the end of the period.");
}
}
if (ignoredPastSegments != 0 || ignoredFutureSegments != 0)
{
feedback.Info($"Ignored {ignoredPastSegments} segments that were too early and would never be played. Ignored {ignoredFutureSegments} segments that were too late and would never be played.");
}
}
