private void InfoTimerTick(object source, ElapsedEventArgs args)
{
while (true)
{
try
{
// let's ignore the time here, for reasons detailed in VLCWrapperParsingUnit.cs around line 115
float position = transcoder.GetPosition();
StreamLog.Trace(context.Identifier, "VLCManagedInfo: calling NewPercentage with position {0}", position);
calculator.NewPercentage(position);
calculator.SaveStats(infoReference);
}
catch (Exception ex)
{
StreamLog.Warn(context.Identifier, "Failed to get VLC data", ex);
}
}
}
private void ParseOutputStream(Stream stdoutStream, Reference <WebTranscodingInfo> data, long startPosition, bool logProgress)
{
StreamReader reader = new StreamReader(stdoutStream);
TranscodingInfoCalculator calculator = new TranscodingInfoCalculator(position, 25, 500, info.Duration); //VLCWrapper prints twice a second
string line;
try
{
while ((line = reader.ReadLine()) != null)
{
try
{
Log.Trace("VLCWrapperParsing: read line {0}", line);
// just for debugging of the wrapper tool
if (line.StartsWith("A") || line.StartsWith("I") || line == "S started" || line == "S null")
{
continue;
}
// propagate start event to Start() method
if (line == "S playing")
{
vlcIsStarted = true;
continue;
}
// events
if (line == "S error")
{
vlcIsStarted = true;
data.Value.Finished = true;
data.Value.Failed = true;
break;
}
if (line == "S finished")
{
data.Value.Finished = true;
continue;
}
// the actual progress parsing
if (line.StartsWith("P"))
{
// Starting with VLCWrapper 0.2, the output format has changed. It is 'P [time in milliseconds]' now, which is quite easy for
// us to handle. With VLC 2 it also returns the time as a 64-bit integer, so we don't have overflow anymore either, but that risk
// is with milliseconds quite small anyhow: it requires 596 hours of video.
long milliseconds = Int64.Parse(line.Substring(2));
calculator.NewTime((int)milliseconds);
calculator.SaveStats(data);
continue;
}
Log.Warn("VLCWrapperParsing: encountered unknown line {0}", line);
}
catch (ThreadAbortException)
{
data.Value.Finished = true;
reader.Close();
return;
}
catch (Exception e)
{
Log.Error("Failure during parsing of VLC output", e);
}
}
}
catch (ThreadAbortException)
{
// The double try-catch is to make sure that the parsing doesn't stop when it can't process a single line, but that we don't
// log too much noise when a ThreadAbortException occurs while in the ReadLine() method. Funnily enough, this exception is
// rethrown when we leave the catch block, so duplicate some code from below...
data.Value.Finished = true;
reader.Close();
return;
}
data.Value.Finished = true;
reader.Close();
}
