/// <summary>
/// Discard chunk content and prepare the chunk object for possible reuse (in a case of Seek())
/// </summary>
public void Reset()
{
// This lock is against simultaneous change by Downloader
lock (this)
{
Downloader = null;
// Close our stream if it exists
if (null != DownloadedPiece)
{
DownloadedPiece.Close();
DownloadedPiece = null;
}
m_parser = null;
DownloadPercent = 0;
DurationLeft = 0;
CurrentOffset = 0;
Length = 0;
SampleRequestsMissed = 0;
State = ChunkState.Pending;
}
}
/// <summary>
/// Parse the header data of this chunk
/// </summary>
/// <param name="parserFactory">the parser factory to use for this chunk</param>
/// <returns>true if the chunk header was header</returns>
public bool ParseHeader(IChunkParserFactory parserFactory)
{
bool isParsed = false;
lock (this)
{
// We can only attempt to parse this chunk when it has been
// completely loaded
if (ChunkState.Loaded == State)
{
bool result = false;
try
{
Tracer.Assert(DownloadedPiece != null);
// Create a new parser for this chunk
m_parser = parserFactory.CreateParserForStream(DownloadedPiece);
m_parser.SetPresentationTime(StartTime);
result = m_parser.ParseHeader(DownloadedPiece);
if (!result)
{
ErrorMessage = String.Format(CultureInfo.InvariantCulture, "{0} Failed to parse, not enough data (state {1}, {2}, {3} kbps)", Sid, State, DateTime.Now.ToUniversalTime().ToString(), Bitrate);
Tracer.Trace(TraceChannel.Error, ErrorMessage);
}
}
catch (ChunkParserException ex)
{
ErrorMessage = String.Format(CultureInfo.InvariantCulture, "{0} Failed to parse (state {1}, exception {2}, {3}, {4} kbps)", Sid, State, ex.Message, DateTime.Now.ToUniversalTime().ToString(), Bitrate);
Tracer.Trace(TraceChannel.Error, ErrorMessage);
Tracer.Assert(!result);
}
if (!result)
{
State = ChunkState.Error;
return false;
}
DurationLeft = Duration;
State = ChunkState.Parsed;
}
isParsed = ChunkState.Parsed == State || ChunkState.Pending == State;
if (ChunkState.Parsed != State)
{
Tracer.Trace(TraceChannel.Error, "{0} state after parsing header: {1}", Sid, State);
}
}
return isParsed;
}