private void DownloadInitSegment(Segment segment, bool initReloadRequired)
{
LogInfo($"Forcing INIT segment reload: {initReloadRequired}");
// Grab a copy (its a struct) of cancellation token so it is not referenced through cancellationTokenSource each time.
var cancelToken = cancellationTokenSource.Token;
if (initStreamBytes == null || initReloadRequired)
{
downloadDataTask = CreateDownloadTask(segment, true, null, cancelToken);
processDataTask = downloadDataTask.ContinueWith(response =>
{
var shouldContinue = true;
if (cancelToken.IsCancellationRequested)
{
shouldContinue = false;
}
else if (response.IsFaulted)
{
HandleFailedInitDownload(GetErrorMessage(response));
shouldContinue = false;
}
else if (response.IsCanceled)
{
shouldContinue = false;
}
else // always continue on successful download
{
InitDataDownloaded(response.Result);
}
// throw exception so continuation wont run
if (!shouldContinue)
{
throw new Exception();
}
}, TaskScheduler.Default);
downloadCompletedTask = processDataTask.ContinueWith(
_ => downloadCompletedSubject.OnNext(Unit.Default),
TaskContinuationOptions.OnlyOnRanToCompletion);
}
else
{
// Already have init segment. Push it down the pipeline & schedule next download
var initData = new DownloadResponse
{
Data = initStreamBytes,
SegmentId = null
};
LogInfo("Segment: INIT Reusing already downloaded data");
InitDataDownloaded(initData);
downloadCompletedSubject.OnNext(Unit.Default);
}
}
private void InitDataDownloaded(DownloadResponse responseResult)
{
if (responseResult.Data != null)
{
chunkReadySubject.OnNext(responseResult.Data);
}
// Assign initStreamBytes AFTER it has been pushed down the shared buffer.
// When issuing EOS, initStreamBytes will be checked for NULLnes.
// We do not want to send EOS before init data - will kill demuxer.
initStreamBytes = responseResult.Data;
initInProgress = false;
LogInfo("Segment: INIT enqueued.");
}
private DownloadLoopStatus HandleSuccessfulDownload(DownloadResponse responseResult)
{
if (cancellationTokenSource.IsCancellationRequested)
{
return(DownloadLoopStatus.GiveUp);
}
var segment = responseResult.DownloadSegment;
lastDownloadSegmentTimeRange = segment.Period.Copy();
bufferTime = segment.Period.Start + segment.Period.Duration;
currentSegmentId = currentStreams.NextSegmentId(currentSegmentId);
var timeInfo = segment.Period.ToString();
LogInfo($"Segment: {responseResult.SegmentId} enqueued {timeInfo}");
return(DownloadLoopStatus.Continue);
}
private bool HandleSuccessfulDownload(DownloadResponse responseResult)
{
if (cancellationTokenSource.IsCancellationRequested)
{
return(false);
}
chunkReadySubject.OnNext(responseResult.Data);
var segment = responseResult.DownloadSegment;
lastDownloadSegmentTimeRange = segment.Period.Copy();
bufferTime = segment.Period.Start + segment.Period.Duration - (trimOffset ?? TimeSpan.Zero);
currentSegmentId = currentStreams.NextSegmentId(currentSegmentId);
var timeInfo = segment.Period.ToString();
LogInfo($"Segment: {responseResult.SegmentId} enqueued {timeInfo}");
if (IsBufferingCompleted())
{
SendBufferingCompletedEvent();
}
return(true);
}
