/// <summary>
/// Parses PAT structure.
/// </summary>
/// <param name="br"></param>
public void ParsePAT(ref Dictionary<uint, TSProgram> programs)
{
if (_payload_unit_start_indicator != 1)
{
throw new NotImplementedException("PAT spanning multiple packets");
}
_bitstream.SkipBits(8);
_headerSize++;
_bitstream.SkipBits(12);
uint section_length = _bitstream.ReadUBits(12);
_bitstream.SkipBits(18);
uint ver = _bitstream.ReadUBits(5);
_bitstream.SkipBits(17);
section_length -= 9;
int count = (int)section_length / 4;
int residul = (int)section_length % 4;
for (int i = 0; i < count; i++)
{
uint programNumber = _bitstream.ReadUBits(16);
_bitstream.SkipBits(3);
if (programNumber != 0)
{
uint programPid = _bitstream.ReadUBits(13);
programs[programPid] = new TSProgram(programPid, programNumber);
}
else
{
_bitstream.SkipBits(13);
}
}
}
/// <summary>
/// Parses PMT structure.
/// </summary>
/// <param name="program"></param>
/// <param name="br"></param>
private void ParsePMT(TSPacket tsPacket, TSProgram program)
{
tsPacket.ParsePMTHeader();
uint streamTypeCode = 0;
uint elementary_PID = 0;
uint ES_info_length = 0;
while (tsPacket.ParseNextPMTStream(ref streamTypeCode, ref elementary_PID, ref ES_info_length))
{
// Allocate stream and payload handlers
if (_streams == null)
_streams = new Dictionary<uint, TSStream>();
TSStream stream;
bool discontinuity;
HLSTrace.WriteLineLow("PMT: type {0} pid {1} len {2}", streamTypeCode.ToString("X"), elementary_PID.ToString("X"), ES_info_length.ToString("X"));
if (_streams.TryGetValue(elementary_PID, out stream))
{
discontinuity = false;
}
else
{
if (streamTypeCode == AVC_STREAM_TYPE_CODE)
{
stream = new TSStream(elementary_PID, TSStream.StreamContetType.Video);
if (_videoFormatParser == null)
_videoFormatParser = new H264Parser(_videoBuffer, _metadata, _stream.HLSStream );
else
_videoFormatParser.Flush();
_videoFormatParser.Bitrate = _bitrate;
stream.Parser = new PESParser(_videoFormatParser);
}
else if (streamTypeCode == AAC_STREAM_TYPE_CODE || streamTypeCode == DDPLUS_STREAM_TYPE_CODE)
{
stream = new TSStream(elementary_PID, TSStream.StreamContetType.Audio);
bool discardThisStream = false;
foreach (KeyValuePair<uint, TSStream> s in _streams)
{
if (s.Value.StreamType == TSStream.StreamContetType.Audio)
{
if (s.Key > elementary_PID)
{
if (_nullFormatParser == null)
_nullFormatParser = new NullParser(null);
s.Value.Parser = new PESParser(_nullFormatParser);
}
else
{
discardThisStream = true;
break;
}
}
}
if (discardThisStream)
{
if (_nullFormatParser == null)
_nullFormatParser = new NullParser(null);
stream.Parser = new PESParser(_nullFormatParser);
stream.StreamType = TSStream.StreamContetType.Unknown;
}
else
{
if (null != _audioFormatParser)
{
_audioFormatParser.Flush();
}
if (streamTypeCode == AAC_STREAM_TYPE_CODE)
_audioFormatParser = new ADTSParser(_audioBuffer, _stream.HLSStream);
else
_audioFormatParser = new DDPlusParser(_audioBuffer, _stream.HLSStream);
stream.Parser = new PESParser(_audioFormatParser);
stream.StreamType = TSStream.StreamContetType.Audio;
}
}
else
{
stream = new TSStream(elementary_PID, TSStream.StreamContetType.Unknown);
HLSTrace.WriteLine("Ignoring unknown stream type {0}", streamTypeCode);
if (_nullFormatParser == null)
_nullFormatParser = new NullParser(null);
stream.Parser = new PESParser(_nullFormatParser);
}
_streams[elementary_PID] = stream;
discontinuity = true;
}
program.AddStream(stream);
stream.Parser.StartSegment(discontinuity);
}
}