public bool TryReadPacket(out Packet packet)
{
//Trace.WriteLine ("Entering", "TryReadPacket");
//Trace.Indent();
packet = null;
int lastSegment = 0;
OggPage page, firstPage;
OggStream ostream;
if (!this.continuation)
{
//Trace.WriteLine ("Not a continuation, reading page", "TryReadPacket");
firstPage = page = ReadPage();
if (page == null)
{
//Trace.Unindent();
//Trace.WriteLine ("Exiting (no packet)", "TryReadPacket");
return false;
}
if (!this.oggStreams.TryGetValue (page.StreamIndex, out ostream))
{
//Trace.WriteLine ("New ogg stream: " + page.StreamIndex, "TryReadPacket");
this.oggStreams[page.StreamIndex] = ostream = new OggStream (ReadPage);
}
//Trace.WriteLine (String.Format("SI: {0}; G: {1:N0}; S: {2:N0}; SL: {3:N0}", page.StreamIndex, page.GranuleNumber, page.SequenceNumber, page.Segments.Length));
ostream.Enqueue (page);
}
else
{
//Trace.WriteLine ("Continuing on page from " + this.lastStreamIndex, "TryReadPacket");
ostream = this.oggStreams[this.lastStreamIndex];
if ((firstPage = page = ostream.Peek()) == null && (firstPage = page = ReadPage()) == null)
{
//Trace.Unindent();
//Trace.WriteLine ("Exiting (no page)", "TryReadPacket");
return false;
}
lastSegment = ostream.LastSegment;
//Trace.WriteLine (this.lastStreamIndex + " Last segment: " + lastSegment, "TryReadPacket");
}
List<byte[]> segments = new List<byte[]>();
int packetLength = 0;
bool packetEndFound = false;
while (!packetEndFound)
{
int i;
for (i = lastSegment; i < page.Segments.Length; ++i)
{
int length = page.Segments[i].Length;
packetLength += length;
segments.Add (page.Segments[i]);
//Trace.WriteLine (String.Format ("Segment {0:N0}, length: {1}", i, length), "TryReadPacket");
if (length < 255)
{
packetEndFound = true;
i++;
break;
}
}
if (!packetEndFound)
{
//Trace.WriteLine ("Reached end of page, continuing with another", "TryReadPacket");
ostream.Dequeue(); // used up whole last page
OggPage nextPage;
while (true)
{
if ((nextPage = ostream.Peek()) == null && (nextPage = ReadPage()) == null)
{
this.continuation = true; // Let's try this stream again next call.
this.lastStreamIndex = page.StreamIndex;
ostream.Enqueue (page);
//Trace.Unindent();
//Trace.WriteLine ("Exiting (no page to continue with)", "TryReadPacket");
return false;
}
if (nextPage.StreamIndex != page.StreamIndex)
{
OggStream nextStream;
if (!this.oggStreams.TryGetValue (page.StreamIndex, out nextStream))
{
//Trace.WriteLine ("New ogg stream: " + page.StreamIndex, "TryReadPacket");
this.oggStreams[page.StreamIndex] = nextStream = new OggStream (ReadPage);
}
nextStream.Enqueue (page);
}
else
{
ostream.Enqueue (page);
break;
}
}
page = nextPage;
lastSegment = 0;
}
else
{
ostream.PacketCount++;
if (i != page.Segments.Length)
{
//Trace.WriteLine ("Not done with this page yet (" + i + "/" + page.Segments.Length + ")", "TryReadPacket");
this.continuation = true;
this.lastStreamIndex = page.StreamIndex;
ostream.LastSegment = i;
}
else
{
//Trace.WriteLine ("Finished packet", "TryReadPacket");
ostream.Dequeue();
this.continuation = false;
}
}
}
byte[] pdata = AssemblePacket (segments);
packet = new OggPacket (page.StreamIndex, ostream.PacketCount - 1, firstPage.GranuleNumber, pdata);
//Trace.Unindent();
//Trace.WriteLine ("Exiting", "TryReadPacket");
return true;
}
public bool TryReadPacket(out Packet packet)
{
//Trace.WriteLine ("Entering", "TryReadPacket");
//Trace.Indent();
packet = null;
int lastSegment = 0;
OggPage page, firstPage;
OggStream ostream;
if (!this.continuation)
{
//Trace.WriteLine ("Not a continuation, reading page", "TryReadPacket");
firstPage = page = ReadPage();
if (page == null)
{
//Trace.Unindent();
//Trace.WriteLine ("Exiting (no packet)", "TryReadPacket");
return(false);
}
if (!this.oggStreams.TryGetValue(page.StreamIndex, out ostream))
{
//Trace.WriteLine ("New ogg stream: " + page.StreamIndex, "TryReadPacket");
this.oggStreams[page.StreamIndex] = ostream = new OggStream(ReadPage);
}
//Trace.WriteLine (String.Format("SI: {0}; G: {1:N0}; S: {2:N0}; SL: {3:N0}", page.StreamIndex, page.GranuleNumber, page.SequenceNumber, page.Segments.Length));
ostream.Enqueue(page);
}
else
{
//Trace.WriteLine ("Continuing on page from " + this.lastStreamIndex, "TryReadPacket");
ostream = this.oggStreams[this.lastStreamIndex];
if ((firstPage = page = ostream.Peek()) == null && (firstPage = page = ReadPage()) == null)
{
//Trace.Unindent();
//Trace.WriteLine ("Exiting (no page)", "TryReadPacket");
return(false);
}
lastSegment = ostream.LastSegment;
//Trace.WriteLine (this.lastStreamIndex + " Last segment: " + lastSegment, "TryReadPacket");
}
List <byte[]> segments = new List <byte[]>();
int packetLength = 0;
bool packetEndFound = false;
while (!packetEndFound)
{
int i;
for (i = lastSegment; i < page.Segments.Length; ++i)
{
int length = page.Segments[i].Length;
packetLength += length;
segments.Add(page.Segments[i]);
//Trace.WriteLine (String.Format ("Segment {0:N0}, length: {1}", i, length), "TryReadPacket");
if (length < 255)
{
packetEndFound = true;
i++;
break;
}
}
if (!packetEndFound)
{
//Trace.WriteLine ("Reached end of page, continuing with another", "TryReadPacket");
ostream.Dequeue(); // used up whole last page
OggPage nextPage;
while (true)
{
if ((nextPage = ostream.Peek()) == null && (nextPage = ReadPage()) == null)
{
this.continuation = true; // Let's try this stream again next call.
this.lastStreamIndex = page.StreamIndex;
ostream.Enqueue(page);
//Trace.Unindent();
//Trace.WriteLine ("Exiting (no page to continue with)", "TryReadPacket");
return(false);
}
if (nextPage.StreamIndex != page.StreamIndex)
{
OggStream nextStream;
if (!this.oggStreams.TryGetValue(page.StreamIndex, out nextStream))
{
//Trace.WriteLine ("New ogg stream: " + page.StreamIndex, "TryReadPacket");
this.oggStreams[page.StreamIndex] = nextStream = new OggStream(ReadPage);
}
nextStream.Enqueue(page);
}
else
{
ostream.Enqueue(page);
break;
}
}
page = nextPage;
lastSegment = 0;
}
else
{
ostream.PacketCount++;
if (i != page.Segments.Length)
{
//Trace.WriteLine ("Not done with this page yet (" + i + "/" + page.Segments.Length + ")", "TryReadPacket");
this.continuation = true;
this.lastStreamIndex = page.StreamIndex;
ostream.LastSegment = i;
}
else
{
//Trace.WriteLine ("Finished packet", "TryReadPacket");
ostream.Dequeue();
this.continuation = false;
}
}
}
byte[] pdata = AssemblePacket(segments);
packet = new OggPacket(page.StreamIndex, ostream.PacketCount - 1, firstPage.GranuleNumber, pdata);
//Trace.Unindent();
//Trace.WriteLine ("Exiting", "TryReadPacket");
return(true);
}
