private bool TryParseContent(TSPacket packet, out byte[] data)
{
data = null;
if (packet.video_block || packet.audio_block)
{
cache.Close();
data = cache.ToArray();
cache = new MemoryStream();
return(true);
}
return(false);
}
public ProgramMapTable(TSPacket pkt, byte[] packet)
{
int section_length = ((packet[pkt.payload_offset + 1] & 0x0F) << 8 | packet[pkt.payload_offset + 2]);
if (section_length < 13)
{
PCRPID = -1;
}
else
{
PCRPID = ((packet[pkt.payload_offset + 8] & 0x1F) << 8 | packet[pkt.payload_offset + 9]);
}
}
public async Task ReadAsync(IContentSink sink, Stream stream, CancellationToken cancel_token)
{
int streamIndex = -1;
long contentPosition = 0;
DateTime streamOrigin = DateTime.Now;
DateTime latestContentTime = DateTime.Now;
byte[] bytes188 = new byte[188];
byte[] latestHead = new byte[0];
byte[] contentData = null;
streamIndex = Channel.GenerateStreamID();
streamOrigin = DateTime.Now;
sink.OnContentHeader(new Content(streamIndex, TimeSpan.Zero, contentPosition, new byte[] {}, PCPChanPacketContinuation.None));
try
{
while (!cancel_token.IsCancellationRequested)
{
bytes188 = await stream.ReadBytesAsync(188, cancel_token).ConfigureAwait(false);
TSPacket packet = new TSPacket(bytes188);
if (packet.sync_byte != 0x47)
{
throw new Exception();
}
if (packet.payload_unit_start_indicator > 0)
{
if (packet.PID == patID)
{
pmtID = packet.PMTID;
head = new MemoryStream();
if (!addHead(bytes188))
{
throw new Exception();
}
continue;
}
if (packet.PID == pmtID)
{
var pmt = new ProgramMapTable(packet, bytes188);
pcrPID = pmt.PCRPID;
if (!addHead(bytes188))
{
throw new Exception();
}
head.Close();
byte[] newHead = head.ToArray();
if (!Enumerable.SequenceEqual(newHead, latestHead))
{
streamIndex = Channel.GenerateStreamID();
contentPosition = 0;
sink.OnContentHeader(new Content(streamIndex, DateTime.Now - streamOrigin, contentPosition, newHead, PCPChanPacketContinuation.None));
contentPosition += newHead.Length;
latestHead = newHead;
}
continue;
}
if (packet.PID == pcrPID && packet.program_clock_reference > 0.0)
{
if (packet.program_clock_reference < rateCounter.lastPCR)
{
rateCounter.lastPCR = packet.program_clock_reference;
rateCounter.byteCount = 0;
recvRate = 0.0;
}
else if (rateCounter.lastPCR + 10.0 < packet.program_clock_reference)
{
var bitrate = 8 * rateCounter.byteCount / (packet.program_clock_reference - rateCounter.lastPCR);
UpdateRecvRate(sink, bitrate);
rateCounter.lastPCR = packet.program_clock_reference;
rateCounter.byteCount = 0;
}
}
if ((DateTime.Now - latestContentTime).Milliseconds > 50)
{
TryParseContent(packet, out contentData);
if (contentData != null)
{
sink.OnContent(new Content(streamIndex, DateTime.Now - streamOrigin, contentPosition, contentData, PCPChanPacketContinuation.None));
contentPosition += contentData.Length;
latestContentTime = DateTime.Now;
}
}
}
if (!addCache(bytes188))
{
throw new Exception();
}
rateCounter.byteCount += 188;
}
}
catch (EndOfStreamException)
{ }
catch (Exception)
{ }
}
