private TimeSpan CalculateDownloadTimeout(Segment segment)
{
if (!IsDynamic)
{
return(TimeSpan.MaxValue);
}
var timeout = timeBufferDepthDefault;
var averageThroughput = throughputHistory.GetAverageThroughput();
if (averageThroughput > 0 && currentRepresentation.Bandwidth.HasValue && segment.Period != null)
{
var bandwidth = currentRepresentation.Bandwidth.Value;
var duration = segment.Period.Duration.TotalSeconds;
var segmentSize = bandwidth * duration;
var calculatedTimeNeeded = TimeSpan.FromSeconds(segmentSize / averageThroughput * 1.5);
var docParams = currentStreams.GetDocumentParameters();
if (docParams == null)
{
throw new ArgumentNullException("currentStreams.GetDocumentParameters() returns null");
}
var manifestMinBufferDepth =
docParams.Document.MinBufferTime ?? TimeSpan.Zero;
timeout = calculatedTimeNeeded > manifestMinBufferDepth ? calculatedTimeNeeded : manifestMinBufferDepth;
}
return(timeout);
}
/// <summary>
/// Swaps updated representation based on Manifest Reload.
/// Updates segment information and base segment ID for the stream.
/// </summary>
/// <returns>bool. True. Representations were swapped. False otherwise</returns>
private void SwapRepresentation()
{
// Exchange updated representation with "null". On subsequent calls, this will be an indication
// that there is no new representations.
var newRep = Interlocked.Exchange(ref newRepresentation, null);
// Update internals with new representation if exists.
if (newRep == null)
{
return;
}
initStreamBytes.Clear();
currentRepresentation = newRep;
currentStreams = currentRepresentation.Segments;
var docParams = currentStreams.GetDocumentParameters();
if (docParams == null)
{
throw new ArgumentNullException("currentStreams.GetDocumentParameters() returns null");
}
currentStreamDuration = IsDynamic
? docParams.Document.MediaPresentationDuration
: currentStreams.Duration;
if (lastDownloadSegmentTimeRange == null)
{
currentSegmentId = currentRepresentation.Segments.StartSegmentId();
firstSegmentClock = currentStreams.SegmentTimeRange(currentSegmentId).Start;
LogInfo($"Rep. Swap. Start Seg: [{currentSegmentId}]");
return;
}
var newSeg = currentStreams.NextSegmentId(lastDownloadSegmentTimeRange.Start);
string message;
if (newSeg.HasValue)
{
var segmentTimeRange = currentStreams.SegmentTimeRange(newSeg);
message = $"Updated Seg: [{newSeg}]/({segmentTimeRange?.Start}-{segmentTimeRange?.Duration})";
}
else
{
message = "Not Found. Setting segment to null";
}
LogInfo(
$"Rep. Swap. Last Seg: {currentSegmentId}/{lastDownloadSegmentTimeRange.Start}-{lastDownloadSegmentTimeRange.Duration} {message}");
currentSegmentId = newSeg;
LogInfo("Representations swapped.");
}
public void Start(bool initReloadRequired)
{
SwapRepresentation();
if (currentRepresentation == null)
{
throw new Exception("currentRepresentation has not been set");
}
initInProgress = true;
initDataDuration = currentStreams.GetDocumentParameters().Document.MinBufferTime ??
MinimumBufferTime;
initSegmentReloadRequired = initReloadRequired;
LogInfo("DashClient start: " + dataRequest.Duration);
if (cancellationTokenSource == null || cancellationTokenSource?.IsCancellationRequested == true)
{
cancellationTokenSource?.Dispose();
cancellationTokenSource = new CancellationTokenSource();
}
bufferTime = currentTime;
if (currentSegmentId.HasValue == false)
{
currentSegmentId = currentRepresentation.AlignedStartSegmentID;
}
if (!trimOffset.HasValue)
{
trimOffset = currentRepresentation.AlignedTrimOffset;
}
if (currentStreams.InitSegment == null)
{
initInProgress = false;
}
downloadCompletedSubject.OnNext(Unit.Default);
}