jellyfin/MediaBrowser.Server.Implementations/LiveTv/TunerHosts/SatIp/Rtp/RtpPacket.cs
2016-09-01 21:54:16 -04:00

117 lines
4.4 KiB
C#

/*
Copyright (C) <2007-2016> <Kay Diefenthal>
SatIp.RtspSample is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
SatIp.RtspSample is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with SatIp.RtspSample. If not, see <http://www.gnu.org/licenses/>.
*/
using System;
using System.Collections.ObjectModel;
using System.Text;
namespace MediaBrowser.Server.Implementations.LiveTv.TunerHosts.SatIp.Rtp
{
public class RtpPacket
{
private static int MinHeaderLength = 12;
public int HeaderSize = MinHeaderLength;
public int Version { get; set; }
public Boolean Padding { get; set; }
public Boolean Extension { get; set; }
public int ContributingSourceCount { get; set; }
public Boolean Marker { get; set; }
public int PayloadType { get; set; }
public int SequenceNumber { get; set; }
public long TimeStamp { get; set; }
public long SynchronizationSource { get; set; }
public Collection<string> ContributingSources { get; private set; }
public int ExtensionHeaderId = 0;
public int ExtensionHeaderLength = 0;
public bool HasPayload { get; set; }
public byte[] Payload { get; set; }
public RtpPacket()
{
}
public static RtpPacket Decode(byte[] buffer)
{
var packet = new RtpPacket();
packet.Version = buffer[0] >> 6;
packet.Padding = (buffer[0] & 0x20) != 0;
packet.Extension = (buffer[0] & 0x10) != 0;
packet.ContributingSourceCount = buffer[0] & 0x0f;
packet.Marker = (buffer[1] & 0x80) != 0;
packet.PayloadType = buffer[1] & 0x7f;
packet.SequenceNumber = Utils.Convert2BytesToInt(buffer, 2);
packet.TimeStamp = Utils.Convert4BytesToLong(buffer, 4);
packet.SynchronizationSource = Utils.Convert4BytesToLong(buffer, 8);
int index = 12;
if (packet.ContributingSourceCount != 0)
{
packet.ContributingSources = new Collection<string>();
while (packet.ContributingSources.Count < packet.ContributingSourceCount)
{
packet.ContributingSources.Add(Utils.ConvertBytesToString(buffer, index, 4));
index += 4;
}
}
var dataoffset = 0;
if (!packet.Extension)
dataoffset = index;
else
{
packet.ExtensionHeaderId = Utils.Convert2BytesToInt(buffer, index);
packet.ExtensionHeaderLength = Utils.Convert2BytesToInt(buffer, index + 2);
dataoffset = index + packet.ExtensionHeaderLength + 4;
}
var dataLength = buffer.Length - dataoffset;
if (dataLength > dataoffset)
{
packet.HasPayload = true;
packet.Payload = new byte[dataLength];
Array.Copy(buffer, dataoffset, packet.Payload, 0, dataLength);
}
else
{
packet.HasPayload = false;
}
return packet;
}
public override string ToString()
{
StringBuilder sb = new StringBuilder();
sb.AppendFormat("RTP Packet");
sb.AppendFormat("Version: {0} \n", Version);
sb.AppendFormat("Padding: {0} \n", Padding);
sb.AppendFormat("Extension: {0} \n", Extension);
sb.AppendFormat("Contributing Source Identifiers Count: {0} \n", ContributingSourceCount);
sb.AppendFormat("Marker: {0} \n", Marker);
sb.AppendFormat("Payload Type: {0} \n", PayloadType);
sb.AppendFormat("Sequence Number: {0} \n", SequenceNumber);
sb.AppendFormat("Timestamp: {0} .\n", TimeStamp);
sb.AppendFormat("Synchronization Source Identifier: {0} \n", SynchronizationSource);
sb.AppendFormat("\n");
return sb.ToString();
}
}
}