protected static async Task SendAsync(IOwinContext context, Stream resourceStream, ProfileMediaItem item, EndPointProfile profile, bool onlyHeaders, bool partialResource, Range byteRange)
{
if (onlyHeaders)
{
return;
}
bool clientDisconnected = false;
Guid streamID = item.StartStreaming();
if (streamID == Guid.Empty)
{
Logger.Error("BaseSendData: Unable to start stream");
return;
}
try
{
if (context.Response.ContentLength == 0)
{
//Not allowed to have a content length of zero
context.Response.ContentLength = null;
}
Logger.Debug("BaseSendData: Sending chunked: {0}", context.Response.ContentLength == null);
string clientID = context.Request.RemoteIpAddress;
int bufferSize = profile.Settings.Communication.DefaultBufferSize;
if (bufferSize <= 0)
{
bufferSize = 1500;
}
byte[] buffer = new byte[bufferSize];
int bytesRead;
long count = 0;
bool isStream = false;
long waitForSize = 0;
if (byteRange.Length == 0 || (byteRange.Length > 0 && byteRange.Length >= profile.Settings.Communication.InitialBufferSize))
{
waitForSize = profile.Settings.Communication.InitialBufferSize;
}
if (partialResource == false)
{
if (waitForSize < byteRange.From)
{
waitForSize = byteRange.From;
}
}
if (await WaitForMinimumFileSizeAsync(resourceStream, waitForSize) == false)
{
Logger.Error("BaseSendData: Unable to send stream because of invalid length: {0} ({1} required)", resourceStream.Length, waitForSize);
return;
}
long start = 0;
if (partialResource == false)
{
start = byteRange.From;
}
if (resourceStream.CanSeek)
{
resourceStream.Seek(start, SeekOrigin.Begin);
}
long length = byteRange.Length;
if (length <= 0 || item.IsLive || (item.IsSegmented == false && item.IsTranscoding == true))
{
isStream = true;
}
int emptyCount = 0;
while (item.IsStreamActive(streamID))
{
if (isStream)
{
if (resourceStream.CanSeek)
{
length = resourceStream.Length - count;
}
else
{
length = bufferSize; //Keep stream alive
}
}
bytesRead = await resourceStream.ReadAsync(buffer, 0, length > bufferSize?bufferSize : (int)length);
count += bytesRead;
if (bytesRead > 0)
{
emptyCount = 0;
try
{
//Send fetched bytes
await context.Response.WriteAsync(buffer, 0, bytesRead, SendDataCancellation.Token);
}
catch (Exception)
{
// Client disconnected
Logger.Debug("BaseSendData: Connection lost after {0} bytes", count);
clientDisconnected = true;
break;
}
length -= bytesRead;
if (isStream == false && length <= 0)
{
//All bytes in the requested range sent
break;
}
}
else
{
emptyCount++;
if (emptyCount > 2)
{
Logger.Debug("BaseSendData: Buffer underrun delay");
await Task.Delay(100);
}
if (emptyCount > 10)
{
//Stream is not getting any bigger
break;
}
}
if (resourceStream.CanSeek)
{
if (item.IsTranscoding == false && resourceStream.Position == resourceStream.Length)
{
//No more data will be available
break;
}
}
}
}
finally
{
item.StopStreaming(streamID);
if (clientDisconnected || item.IsSegmented == false)
{
if (clientDisconnected == false)
{
//Everything sent to client so presume watched
if (item.IsLive == false)
{
Guid? userId = ResourceAccessUtils.GetUser(context);
IMediaLibrary library = ServiceRegistration.Get <IMediaLibrary>();
if (library != null && userId.HasValue)
{
library.NotifyUserPlayback(userId.Value, item.MediaItemId, 100, true);
}
}
}
}
Logger.Debug("BaseSendData: Sending complete");
}
}