public static async Task <bool> ProcessAsync(IOwinContext context, string identifier, string file, string hls)
{
Stream resourceStream = null;
bool onlyHeaders = false;
if (identifier == null)
{
throw new BadRequestException("RetrieveStream: Identifier is null");
}
StreamItem streamItem = await StreamControl.GetStreamItemAsync(identifier);
if (streamItem == null)
{
throw new BadRequestException("RetrieveStream: Identifier is not valid");
}
if (!streamItem.IsActive)
{
Logger.Debug("RetrieveStream: Stream for {0} is no longer active", identifier);
SetErrorStatus(context, "Stream is no longer active");
return(true);
}
long startPosition = streamItem.StartPosition;
if (hls != null)
{
#region Handle segment/playlist request
if (await SendSegmentAsync(hls, context, streamItem))
{
return(true);
}
if (streamItem.ItemType != Common.WebMediaType.TV && streamItem.ItemType != Common.WebMediaType.Radio &&
MediaConverter.GetSegmentSequence(hls) >= 0)
{
long segmentRequest = MediaConverter.GetSegmentSequence(hls);
if (await streamItem.RequestSegmentAsync(segmentRequest) == false)
{
Logger.Error("RetrieveStream: Request for segment file {0} canceled", hls);
SetErrorStatus(context, "Request for segment file canceled");
return(true);
}
startPosition = segmentRequest * MediaConverter.HLSSegmentTimeInSeconds;
}
else
{
Logger.Error("RetrieveStream: Unable to find segment file {0}", hls);
SetErrorStatus(context, "Unable to find segment file");
return(true);
}
#endregion
}
#region Init response
// Grab the mimetype from the media item and set the Content Type header.
if (streamItem.TranscoderObject.Mime == null)
{
throw new InternalServerException("RetrieveStream: Media item has bad mime type, re-import media item");
}
context.Response.ContentType = streamItem.TranscoderObject.Mime;
TransferMode mediaTransferMode = TransferMode.Interactive;
if (streamItem.TranscoderObject.IsVideo || streamItem.TranscoderObject.IsAudio)
{
mediaTransferMode = TransferMode.Streaming;
}
StreamMode requestedStreamingMode = StreamMode.Normal;
string byteRangesSpecifier = context.Request.Headers["Range"];
if (byteRangesSpecifier != null)
{
Logger.Debug("RetrieveStream: Requesting range {1} for mediaitem {0}", streamItem.RequestedMediaItem.MediaItemId, byteRangesSpecifier);
requestedStreamingMode = StreamMode.ByteRange;
}
#endregion
#region Process range request
if (streamItem.StreamContext is TranscodeContext tc && (streamItem.TranscoderObject.IsTranscoding == false ||
(tc.Partial == false && tc.TargetFileSize > 0 && tc.TargetFileSize > streamItem.TranscoderObject.Metadata.Size)))
{
streamItem.TranscoderObject.Metadata.Size = tc.TargetFileSize;
}
IList <Range> ranges = null;
Range timeRange = new Range(startPosition, 0);
Range byteRange = null;
if (requestedStreamingMode == StreamMode.ByteRange)
{
long lSize = GetStreamSize(streamItem.TranscoderObject);
ranges = ParseByteRanges(byteRangesSpecifier, lSize);
if (ranges == null || ranges.Count == 0)
{
//At least 1 range is needed
context.Response.StatusCode = (int)HttpStatusCode.RequestedRangeNotSatisfiable;
context.Response.ContentLength = 0;
context.Response.ContentType = null;
Logger.Debug("RetrieveStream: Sending headers: " + string.Join(";", context.Response.Headers.Select(x => x.Key + "=" + x.Value).ToArray()));
return(true);
}
}
if (streamItem.TranscoderObject.IsSegmented == false && streamItem.TranscoderObject.IsTranscoding == true && mediaTransferMode == TransferMode.Streaming)
{
if ((requestedStreamingMode == StreamMode.ByteRange) && (ranges == null || ranges.Count == 0))
{
//At least 1 range is needed
context.Response.StatusCode = (int)HttpStatusCode.RequestedRangeNotSatisfiable;
context.Response.ContentLength = 0;
context.Response.ContentType = null;
Logger.Debug("RetrieveStream: Sending headers: " + string.Join(";", context.Response.Headers.Select(x => x.Key + "=" + x.Value).ToArray()));
return(true);
}
}
if (ranges != null && ranges.Count > 0)
{
//Use only last range
if (requestedStreamingMode == StreamMode.ByteRange)
{
byteRange = ranges[ranges.Count - 1];
timeRange = ConvertToTimeRange(byteRange, streamItem.TranscoderObject);
}
}
#endregion
#region Handle ready file request
// The initial request?
if (resourceStream == null && streamItem.StreamContext != null && (streamItem.StartPosition == timeRange.From || file != null))
{
resourceStream = streamItem.StreamContext.Stream;
}
if (resourceStream == null && streamItem.TranscoderObject.IsTranscoded == false)
{
var streamContext = await StreamControl.StartOriginalFileStreamingAsync(identifier);
resourceStream = streamContext?.Stream;
}
#endregion
#region Handle transcode
bool partialResource = false;
if (resourceStream == null)
{
Logger.Debug("RetrieveStream: Attempting to start streaming for mediaitem {0} in mode {1}", streamItem.RequestedMediaItem.MediaItemId, requestedStreamingMode.ToString());
var transcode = await StreamControl.StartStreamingAsync(identifier, timeRange.From);
partialResource = transcode?.Partial ?? false;
resourceStream = transcode?.Stream;
//Send any HLS file originally requested
if (hls != null && await SendSegmentAsync(hls, context, streamItem))
{
return(true);
}
}
if (!streamItem.TranscoderObject.IsStreamable)
{
Logger.Debug("RetrieveStream: Live transcoding of mediaitem {0} is not possible because of media container", streamItem.RequestedMediaItem.MediaItemId);
}
#endregion
#region Finish and send response
// HTTP/1.1 RFC2616 section 14.25 'If-Modified-Since'
if (!string.IsNullOrEmpty(context.Request.Headers["If-Modified-Since"]))
{
DateTime lastRequest = DateTime.Parse(context.Request.Headers["If-Modified-Since"]);
if (lastRequest.CompareTo(streamItem.TranscoderObject.LastUpdated) <= 0)
{
context.Response.StatusCode = (int)HttpStatusCode.NotModified;
}
}
// HTTP/1.1 RFC2616 section 14.29 'Last-Modified'
context.Response.Headers["Last-Modified"] = streamItem.TranscoderObject.LastUpdated.ToUniversalTime().ToString("r");
if (resourceStream == null)
{
context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
context.Response.ReasonPhrase = "No resource stream found";
context.Response.ContentLength = 0;
context.Response.ContentType = null;
return(true);
}
using (await streamItem.RequestBusyLockAsync(SendDataCancellation.Token))
{
// TODO: fix method
onlyHeaders = context.Request.Method == "HEAD" || context.Response.StatusCode == (int)HttpStatusCode.NotModified;
if (requestedStreamingMode == StreamMode.ByteRange)
{
if (ranges != null && ranges.Count > 0)
{
// We only support last range
await SendByteRangeAsync(context, resourceStream, streamItem.TranscoderObject, streamItem.Profile, ranges[ranges.Count - 1], onlyHeaders, partialResource, mediaTransferMode);
return(true);
}
}
Logger.Debug("RetrieveStream: Sending file header only: {0}", onlyHeaders.ToString());
await SendWholeFileAsync(context, resourceStream, streamItem.TranscoderObject, streamItem.Profile, onlyHeaders, partialResource, mediaTransferMode);
}
#endregion
return(true);
}