This is an abstract class from which all RTCP packet types are derived. It contains code used to validate the RTCP packet. More...

#include <RTCP_Packet.h>

Inheritance diagram for RTCP_Packet:

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Collaboration diagram for RTCP_Packet:

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List of all members.

Public Member Functions
	RTCP_Packet (void)
	Constructor for outgoing RTCP packets.
	RTCP_Packet (char *buffer)
	Constructor for incoming RTCP packets.
virtual	~RTCP_Packet ()
	Destructor.
void	get_packet_data (char **buffer, ACE_UINT16 &length)
	Returns a pointer to a local buffer containing the packet.
virtual unsigned int	packet_size (void)=0
int	is_valid (char is_first)
Protected Member Functions
virtual void	build_packet (void)=0
Protected Attributes
RTCP_Common_Header	chd_
	Header data common to all RTCP packets.
char *	packet_data_
	Buffer to hold byte representation of the RTCP packet.

Detailed Description

This is an abstract class from which all RTCP packet types are derived. It contains code used to validate the RTCP packet.

Definition at line 44 of file RTCP_Packet.h.

Constructor & Destructor Documentation

RTCP_Packet::RTCP_Packet ( void )

Constructor for outgoing RTCP packets.

Definition at line 7 of file RTCP_Packet.cpp.

{
  this->chd_.ver_ = 2;
  this->chd_.count_ = 0;
  this->chd_.pad_ = 0;
  this->chd_.length_ = 0;
  this->packet_data_ = 0;
}

RTCP_Packet::RTCP_Packet ( char * buffer )

Constructor for incoming RTCP packets.

Definition at line 16 of file RTCP_Packet.cpp.

{
  // Parse the common part of the control packet header.
  this->chd_.ver_ = (buffer[0] & 0xC0) >> 6;

  if (this->chd_.ver_ != RTP_VERSION)
    ACE_DEBUG ((LM_DEBUG,
                "RTCP_Packet::RTCP_Packet version incorrect"));

  this->chd_.pad_ = (buffer[0] & 0x20) >> 5;
  this->chd_.count_ = buffer[0] & 0x1F;
  this->chd_.pt_ = buffer[1];
  this->chd_.length_ = ACE_NTOHS(*(ACE_UINT16*)&buffer[2]);
  this->packet_data_ = 0;
}

RTCP_Packet::~RTCP_Packet ( void ) [virtual]

Destructor.

Definition at line 32 of file RTCP_Packet.cpp.

{
}

Member Function Documentation

virtual void RTCP_Packet::build_packet ( void ) [protected, pure virtual]

Used to create the byte representation of the RTCP packet. Defined in child class.

Implemented in RTCP_BYE_Packet, RTCP_RR_Packet, RTCP_SDES_Packet, and RTCP_SR_Packet.

void RTCP_Packet::get_packet_data	(	char **	buffer,
		ACE_UINT16 &	length
	)

Returns a pointer to a local buffer containing the packet.

Definition at line 37 of file RTCP_Packet.cpp.

{
  length = static_cast<ACE_UINT16> (this->packet_size());

  // buiidPacket is defined for each child of RTCP_Packet
  // buildPacket creates a snapshot of the RTCP packet in the buffer pktData
  this->build_packet ();

  *buffer = this->packet_data_;
}

int RTCP_Packet::is_valid ( char is_first )

Checks the validity of an RTCP packet. RTCP packets can be sent together in a compound packet and is_first indicates the first packet in a compound packet

Definition at line 49 of file RTCP_Packet.cpp.

{
  // make sure the RTP version is correct
  if (this->chd_.ver_ != RTP_VERSION)
    return 0;

  // these checks are only for the first RTCP packet in a compound packet
  if (is_first)
    {
      // the payload type must be RR or SR
      if ((this->chd_.pt_ != RTCP_PT_SR) && (this->chd_.pt_ != RTCP_PT_RR))
        return 0;

      // the padding bit must not be set
      if (this->chd_.pad_ != 0)
        return 0;
    }

  return 1;

}