The RTCP_Channel_In class represents a single incoming data channel, or stream. The class has several responsibilities. When the class is instantiated, the incoming RTP traffic must be declared a valid source based on the RTP packets received. Once declared valie, this class is responsible for keeping up with reception statistics and other information. When an SR or RR is created (outside of this class), this class is used to get the Receiver Report block for this particular stream. More...

#include <RTCP_Channel.h>

Collaboration diagram for RTCP_Channel_In:

[legend]

List of all members.

Public Member Functions
	RTCP_Channel_In (ACE_UINT32 ssrc, const ACE_Addr *addr)
	~RTCP_Channel_In (void)
	Destructor.
void	recv_rtp_packet (ACE_Message_Block mb, const ACE_Addr peer_addr)
RR_Block *	getRRBlock (void)
	Takes statistics of incoming RTP traffic and creates a receiver report block.
ACE_UINT32	dlsr (void)
	Returns the delay since last sender report.
ACE_UINT32	lsr (void)
	Returns the last sender report timestamp.
int	updateStatistics (RTCP_SR_Packet *sr)
	Updates channel information with incoming sender report.
int	updateStatistics (RTCP_RR_Packet *rr)
	Updates channel information with incoming receiver report.
int	sender (void)
	Returns 1 if data has been sent since the last report, 0 if not.
int	active (void)
	Returns 1 if this is an active source, 0 if not.
Private Member Functions
	RTCP_Channel_In (void)
	Don't want default constructor.
	RTCP_Channel_In (const RTCP_Channel_In &ch)
	Don't want copy constructor.
void	updateStatistics (RTP_Packet *pkt)
	This operation is used update statistics for the incoming RTP packet.
void	init_seq (ACE_UINT16 seq)
	This is called when the first RTP packet is received.
int	update_seq (ACE_UINT16 seq)
Private Attributes
ACE_UINT32	remote_ssrc_
	The synchronization source id of the source this channel represents.
ACE_CString	cname_
	The canonical name of the source this channel represents.
ACE_UINT16	max_seq_
	The highest sequence number seen.
ACE_UINT32	cycles_
	The shifted count of sequence number cycles (ie when sequence number wraps)
ACE_UINT32	base_seq_
	The first sequence number received.
ACE_UINT32	bad_seq_
	last 'bad' sequence number + 1
ACE_UINT32	probation_
	The number of in sequence packets until a source is declared valid.
ACE_UINT32	received_
	The number of packets received.
ACE_UINT32	expected_prior_
	The packet expected at last interval.
ACE_UINT32	received_prior_
	The packet received at last interval.
ACE_UINT32	transit_
	The last transit time.
double	jitter_
	The inter-arrival jitter measured in timestamp units.
char	first_data_packet_
	Flag to indicate the first data packet received.
ACE_UINT32	init_time_stamp_
	The first timestamp received.
ACE_Time_Value	init_local_time_
	The local time that the initial packet was received.
ACE_Addr *	peer_address_
	The address that the first RTP packet was received from.
ACE_UINT32	ntp_ts_msw_
	The most significant word of the last sender report NTP timestamp.
ACE_UINT32	ntp_ts_lsw_
	The least significant word of the last sender report NTP timestamp.
ACE_UINT32	rtp_ts_
	The last sender report RTP timestamp.
ACE_UINT32	last_sr_time_
int	active_
	Flag to indicate whether or not the source is active.
int	no_data_counter_
char	data_since_last_report_
int	payload_type_
	The RTP payload type.

Detailed Description

The RTCP_Channel_In class represents a single incoming data channel, or stream. The class has several responsibilities. When the class is instantiated, the incoming RTP traffic must be declared a valid source based on the RTP packets received. Once declared valie, this class is responsible for keeping up with reception statistics and other information. When an SR or RR is created (outside of this class), this class is used to get the Receiver Report block for this particular stream.

Constructor & Destructor Documentation

RTCP_Channel_In::RTCP_Channel_In	(	ACE_UINT32	ssrc,
		const ACE_Addr *	addr
	)

Constructor for an incoming channel. Requires the synchronization source id and address of the sender.

RTCP_Channel_In::~RTCP_Channel_In ( void )

Destructor.

RTCP_Channel_In::RTCP_Channel_In ( void )

private

Don't want default constructor.

RTCP_Channel_In::RTCP_Channel_In ( const RTCP_Channel_In & ch )

private

Don't want copy constructor.

Member Function Documentation

int RTCP_Channel_In::active ( void )

inline

Returns 1 if this is an active source, 0 if not.

ACE_UINT32 RTCP_Channel_In::dlsr ( void )

Returns the delay since last sender report.

RR_Block * RTCP_Channel_In::getRRBlock ( void )

Takes statistics of incoming RTP traffic and creates a receiver report block.

void RTCP_Channel_In::init_seq ( ACE_UINT16 seq )

private

This is called when the first RTP packet is received.

ACE_UINT32 RTCP_Channel_In::lsr ( void )

Returns the last sender report timestamp.

void RTCP_Channel_In::recv_rtp_packet	(	ACE_Message_Block *	mb,
		const ACE_Addr *	peer_addr
	)

This operation takes the incoming ACE_Message_Block, converts it to an RTP_Packet and calls updateStatistics. It also uses compares the peer_addr to the stored peer_address_ to check for loops.

int RTCP_Channel_In::sender ( void )

inline

Returns 1 if data has been sent since the last report, 0 if not.

int RTCP_Channel_In::update_seq ( ACE_UINT16 seq )

private

This is called when each RTP packet is received. It is used to declare a source as valid.

int RTCP_Channel_In::updateStatistics ( RTCP_SR_Packet * sr )

Updates channel information with incoming sender report.

int RTCP_Channel_In::updateStatistics ( RTCP_RR_Packet * rr )

Updates channel information with incoming receiver report.

void RTCP_Channel_In::updateStatistics ( RTP_Packet * pkt )

private

This operation is used update statistics for the incoming RTP packet.

Member Data Documentation

int RTCP_Channel_In::active_

private

Flag to indicate whether or not the source is active.

ACE_UINT32 RTCP_Channel_In::bad_seq_

private

last 'bad' sequence number + 1

ACE_UINT32 RTCP_Channel_In::base_seq_

private

The first sequence number received.

ACE_CString RTCP_Channel_In::cname_

private

The canonical name of the source this channel represents.

ACE_UINT32 RTCP_Channel_In::cycles_

private

The shifted count of sequence number cycles (ie when sequence number wraps)

char RTCP_Channel_In::data_since_last_report_

private

This flag indicates that data has been received since the last report was sent.

ACE_UINT32 RTCP_Channel_In::expected_prior_

private

The packet expected at last interval.

char RTCP_Channel_In::first_data_packet_

private

Flag to indicate the first data packet received.

ACE_Time_Value RTCP_Channel_In::init_local_time_

private

The local time that the initial packet was received.

ACE_UINT32 RTCP_Channel_In::init_time_stamp_

private

The first timestamp received.

double RTCP_Channel_In::jitter_

private

The inter-arrival jitter measured in timestamp units.

ACE_UINT32 RTCP_Channel_In::last_sr_time_

private

The last time a sender report was received in 1/65536 seconds. Used to calculate DLSR.

ACE_UINT16 RTCP_Channel_In::max_seq_

private

The highest sequence number seen.

int RTCP_Channel_In::no_data_counter_

private

This is a counter to indicate the number of reporting intervals that have passed since data has been received. After 32, declare the source inactive.

ACE_UINT32 RTCP_Channel_In::ntp_ts_lsw_

private

The least significant word of the last sender report NTP timestamp.

ACE_UINT32 RTCP_Channel_In::ntp_ts_msw_

private

The most significant word of the last sender report NTP timestamp.

int RTCP_Channel_In::payload_type_

private

The RTP payload type.

ACE_Addr* RTCP_Channel_In::peer_address_

private

The address that the first RTP packet was received from.

ACE_UINT32 RTCP_Channel_In::probation_

private

The number of in sequence packets until a source is declared valid.

ACE_UINT32 RTCP_Channel_In::received_

private

The number of packets received.

ACE_UINT32 RTCP_Channel_In::received_prior_

private

The packet received at last interval.

ACE_UINT32 RTCP_Channel_In::remote_ssrc_

private

The synchronization source id of the source this channel represents.

ACE_UINT32 RTCP_Channel_In::rtp_ts_

private

The last sender report RTP timestamp.

ACE_UINT32 RTCP_Channel_In::transit_

private

The last transit time.

The documentation for this class was generated from the following files:

Public Member Functions

Private Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation