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using System;
using System.Collections.Generic;
using System.Text;
namespace LumiSoft.Net.RTP
{
/// <summary>
/// This class represents Application-Defined RTCP Packet.
/// </summary>
public class RTCP_Packet_APP : RTCP_Packet
{
private int m_Version = 2;
private int m_SubType = 0;
private int m_Source = 0;
private string m_Name = "";
private byte[] m_Data = null;
/// <summary>
/// Default constructor.
/// </summary>
internal RTCP_Packet_APP()
{
m_Name = "xxxx";
m_Data = new byte[0];
}
#region method ParseInternal
/// <summary>
/// Parses APP packet from the specified buffer.
/// </summary>
/// <param name="buffer">Buffer what conatins APP packet.</param>
/// <param name="offset">Offset in buffer.</param>
/// <exception cref="ArgumentNullException">Is raised when <b>buffer</b> is null.</exception>
/// <exception cref="ArgumentException">Is raised when any of the arguments has invalid value.</exception>
protected override void ParseInternal(byte[] buffer,ref int offset)
{
/* RFC 3550 6.7 APP: Application-Defined RTCP Packet.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|V=2|P| subtype | PT=APP=204 | length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SSRC/CSRC |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| name (ASCII) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| application-dependent data ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
if(buffer == null){
throw new ArgumentNullException("buffer");
}
if(offset < 0){
throw new ArgumentException("Argument 'offset' value must be >= 0.");
}
m_Version = buffer[offset++] >> 6;
bool isPadded = Convert.ToBoolean((buffer[offset] >> 5) & 0x1);
int subType = buffer[offset++] & 0x1F;
int type = buffer[offset++];
int length = buffer[offset++] << 8 | buffer[offset++];
if(isPadded){
this.PaddBytesCount = buffer[offset + length];
}
m_SubType = subType;
m_Source = buffer[offset++] << 24 | buffer[offset++] << 16 | buffer[offset++] << 8 | buffer[offset++];
m_Name = ((char)buffer[offset++]).ToString() + ((char)buffer[offset++]).ToString() + ((char)buffer[offset++]).ToString() + ((char)buffer[offset++]).ToString();
m_Data = new byte[length - 8];
Array.Copy(buffer,offset,m_Data,0,m_Data.Length);
}
#endregion
#region method ToByte
/// <summary>
/// Stores APP packet to the specified buffer.
/// </summary>
/// <param name="buffer">Buffer where to store APP packet.</param>
/// <param name="offset">Offset in buffer.</param>
/// <exception cref="ArgumentNullException">Is raised when <b>buffer</b> is null.</exception>
/// <exception cref="ArgumentException">Is raised when any of the arguments has invalid value.</exception>
public override void ToByte(byte[] buffer,ref int offset)
{
/* RFC 3550 6.7 APP: Application-Defined RTCP Packet.
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|V=2|P| subtype | PT=APP=204 | length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SSRC/CSRC |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| name (ASCII) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| application-dependent data ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
if(buffer == null){
throw new ArgumentNullException("buffer");
}
if(offset < 0){
throw new ArgumentException("Argument 'offset' value must be >= 0.");
}
int length = 8 + m_Data.Length;
// V P subtype
buffer[offset++] = (byte)(2 << 6 | 0 << 5 | m_SubType & 0x1F);
// PT=APP=204
buffer[offset++] = 204;
// length
buffer[offset++] = (byte)((length >> 8) | 0xFF);
buffer[offset++] = (byte)((length) | 0xFF);
// SSRC/CSRC
buffer[offset++] = (byte)((m_Source >> 24) | 0xFF);
buffer[offset++] = (byte)((m_Source >> 16) | 0xFF);
buffer[offset++] = (byte)((m_Source >> 8) | 0xFF);
buffer[offset++] = (byte)((m_Source) | 0xFF);
// name
buffer[offset++] = (byte)m_Name[0];
buffer[offset++] = (byte)m_Name[1];
buffer[offset++] = (byte)m_Name[2];
buffer[offset++] = (byte)m_Name[2];
// application-dependent data
Array.Copy(m_Data,0,buffer,offset,m_Data.Length);
offset += m_Data.Length;
}
#endregion
#region Properties Implementation
/// <summary>
/// Gets RTCP version.
/// </summary>
public override int Version
{
get{ return m_Version; }
}
/// <summary>
/// Gets RTCP packet type.
/// </summary>
public override int Type
{
get{ return RTCP_PacketType.APP; }
}
/// <summary>
/// Gets subtype value.
/// </summary>
public int SubType
{
get{ return m_SubType; }
}
/// <summary>
/// Gets sender synchronization(SSRC) or contributing(CSRC) source identifier.
/// </summary>
public int Source
{
get{ return m_Source; }
}
/// <summary>
/// Gets 4 ASCII char packet name.
/// </summary>
public string Name
{
get{ return m_Name; }
}
/// <summary>
/// Gets application-dependent data.
/// </summary>
public byte[] Data
{
get{ return m_Data; }
}
/// <summary>
/// Gets number of bytes needed for this packet.
/// </summary>
public override int Size
{
get{ return 12 + m_Data.Length; }
}
#endregion
}
}
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