The RtpSession api. More...

#include <ortp/port.h>
#include <ortp/rtp.h>
#include <ortp/payloadtype.h>
#include <ortp/rtpprofile.h>
#include <ortp/sessionset.h>
#include <ortp/rtcp.h>
#include <ortp/str_utils.h>
#include <ortp/rtpsignaltable.h>
#include <ortp/event.h>

Data Structures
struct	_JBParameters

struct	_JitterControl

struct	_WaitPoint

struct	_RtpTransportModifier

struct	_RtpTransport

struct	_OrtpNetworkSimulatorParams

struct	_OrtpNetworkSimulatorCtx

struct	OrtpRtcpSendAlgorithm

struct	OrtpRtcpFbConfiguration

struct	OrtpRtcpXrMediaCallbacks

struct	OrtpRtcpXrConfiguration

struct	OrtpRtcpXrStats

struct	OrtpRtcpTmmbrInfo

struct	_OrtpAddress

struct	_OrtpStream

struct	_RtpStream

struct	_RtcpStream

struct	_RtpSession

Macros
#define	ORTP_AVPF_FEATURE_NONE 0

#define	ORTP_AVPF_FEATURE_TMMBR (1 << 0)

#define	ORTP_AVPF_FEATURE_GENERIC_NACK (1 << 1)

#define	ORTP_RTCP_XR_UNAVAILABLE_PARAMETER 127

#define	rtp_session_remove_contributing_sources rtp_session_remove_contributing_source

#define	rtp_session_set_flag(session, flag) (session)->flags\|=(flag)

#define	rtp_session_unset_flag(session, flag) (session)->flags&=~(flag)

Typedefs
typedef struct _JBParameters	JBParameters

typedef struct _JitterControl	JitterControl

typedef struct _WaitPoint	WaitPoint

typedef struct _RtpTransportModifier	RtpTransportModifier

typedef struct _RtpTransport	RtpTransport

typedef enum _OrtpNetworkSimulatorMode	OrtpNetworkSimulatorMode

typedef struct _OrtpNetworkSimulatorParams	OrtpNetworkSimulatorParams

typedef struct _OrtpNetworkSimulatorCtx	OrtpNetworkSimulatorCtx

typedef struct OrtpRtcpSendAlgorithm	OrtpRtcpSendAlgorithm

typedef struct OrtpRtcpFbConfiguration	OrtpRtcpFbConfiguration

typedef OrtpRtcpXrPlcStatus(*	OrtpRtcpXrPlcCallback )(void *userdata)

typedef int(*	OrtpRtcpXrSignalLevelCallback )(void *userdata)

typedef int(*	OrtpRtcpXrNoiseLevelCallback )(void *userdata)

typedef float(*	OrtpRtcpXrAverageQualityIndicatorCallback )(void *userdata)

typedef struct OrtpRtcpXrMediaCallbacks	OrtpRtcpXrMediaCallbacks

typedef struct OrtpRtcpXrConfiguration	OrtpRtcpXrConfiguration

typedef struct OrtpRtcpXrStats	OrtpRtcpXrStats

typedef struct OrtpRtcpTmmbrInfo	OrtpRtcpTmmbrInfo

typedef struct _OrtpAddress	OrtpAddress

typedef struct _OrtpStream	OrtpStream

typedef struct _RtpStream	RtpStream

typedef struct _RtcpStream	RtcpStream

typedef struct _RtpSession	RtpSession

Enumerations
enum	RtpSessionMode { RTP_SESSION_RECVONLY, RTP_SESSION_SENDONLY, RTP_SESSION_SENDRECV }

enum	_OrtpNetworkSimulatorMode { OrtpNetworkSimulatorInvalid =-1, OrtpNetworkSimulatorInbound, OrtpNetworkSimulatorOutbound, OrtpNetworkSimulatorOutboundControlled }

enum	OrtpRtcpXrPlcStatus { OrtpRtcpXrNoPlc, OrtpRtcpXrSilencePlc, OrtpRtcpXrEnhancedPlc }

enum	OrtpRtcpXrRcvrRttMode { OrtpRtcpXrRcvrRttNone, OrtpRtcpXrRcvrRttAll, OrtpRtcpXrRcvrRttSender }

enum	OrtpRtcpXrStatSummaryFlag { OrtpRtcpXrStatSummaryLoss = (1 << 7), OrtpRtcpXrStatSummaryDup = (1 << 6), OrtpRtcpXrStatSummaryJitt = (1 << 5), OrtpRtcpXrStatSummaryTTL = (1 << 3), OrtpRtcpXrStatSummaryHL = (1 << 4) }

Functions
const char *	ortp_network_simulator_mode_to_string (OrtpNetworkSimulatorMode mode)

OrtpNetworkSimulatorMode	ortp_network_simulator_mode_from_string (const char *str)

RtpSession *	rtp_session_new (int mode)

void	rtp_session_set_scheduling_mode (RtpSession *session, int yesno)

void	rtp_session_set_blocking_mode (RtpSession *session, int yesno)

void	rtp_session_set_profile (RtpSession session, RtpProfile profile)

void	rtp_session_set_send_profile (RtpSession session, RtpProfile profile)

void	rtp_session_set_recv_profile (RtpSession session, RtpProfile profile)

RtpProfile *	rtp_session_get_profile (RtpSession *session)

RtpProfile *	rtp_session_get_send_profile (RtpSession *session)

RtpProfile *	rtp_session_get_recv_profile (RtpSession *session)

int	rtp_session_signal_connect (RtpSession session, const char signal_name, RtpCallback cb, void *user_data)

int	rtp_session_signal_disconnect_by_callback (RtpSession session, const char signal_name, RtpCallback cb)

void	rtp_session_set_ssrc (RtpSession *session, uint32_t ssrc)

uint32_t	rtp_session_get_send_ssrc (RtpSession *session)

uint32_t	rtp_session_get_recv_ssrc (RtpSession *session)

void	rtp_session_set_seq_number (RtpSession *session, uint16_t seq)

uint16_t	rtp_session_get_seq_number (RtpSession *session)

uint32_t	rtp_session_get_rcv_ext_seq_number (RtpSession *session)

int	rtp_session_get_cum_loss (RtpSession *session)

void	rtp_session_set_duplication_ratio (RtpSession *session, float ratio)

void	rtp_session_enable_jitter_buffer (RtpSession *session, bool_t enabled)

bool_t	rtp_session_jitter_buffer_enabled (const RtpSession *session)

void	rtp_session_set_jitter_buffer_params (RtpSession session, const JBParameters par)

void	rtp_session_get_jitter_buffer_params (RtpSession session, JBParameters par)

void	rtp_session_set_jitter_compensation (RtpSession *session, int milisec)

void	rtp_session_enable_adaptive_jitter_compensation (RtpSession *session, bool_t val)

bool_t	rtp_session_adaptive_jitter_compensation_enabled (RtpSession *session)

void	rtp_session_set_time_jump_limit (RtpSession *session, int miliseconds)

int	rtp_session_join_multicast_group (RtpSession session, const char ip)

int	rtp_session_set_local_addr (RtpSession session, const char addr, int rtp_port, int rtcp_port)

int	rtp_session_get_local_port (const RtpSession *session)

int	rtp_session_get_local_rtcp_port (const RtpSession *session)

int	rtp_session_set_remote_addr_full (RtpSession session, const char rtp_addr, int rtp_port, const char *rtcp_addr, int rtcp_port)

int	rtp_session_set_remote_addr_and_port (RtpSession session, const char addr, int rtp_port, int rtcp_port)

int	rtp_session_set_remote_addr (RtpSession session, const char addr, int port)

int	rtp_session_add_aux_remote_addr_full (RtpSession session, const char rtp_addr, int rtp_port, const char *rtcp_addr, int rtcp_port)

void	rtp_session_clear_aux_remote_addr (RtpSession *session)

void	rtp_session_set_sockets (RtpSession *session, int rtpfd, int rtcpfd)

void	rtp_session_get_transports (const RtpSession session, RtpTransport rtptr, RtpTransport *rtcptr)

ortp_socket_t	rtp_session_get_rtp_socket (const RtpSession *session)

ortp_socket_t	rtp_session_get_rtcp_socket (const RtpSession *session)

void	rtp_session_refresh_sockets (RtpSession *session)

int	rtp_session_set_dscp (RtpSession *session, int dscp)

int	rtp_session_get_dscp (const RtpSession *session)

int	rtp_session_set_pktinfo (RtpSession *session, int activate)

int	rtp_session_set_multicast_ttl (RtpSession *session, int ttl)

int	rtp_session_get_multicast_ttl (RtpSession *session)

int	rtp_session_set_multicast_loopback (RtpSession *session, int yesno)

int	rtp_session_get_multicast_loopback (RtpSession *session)

int	rtp_session_set_send_payload_type (RtpSession *session, int paytype)

int	rtp_session_get_send_payload_type (const RtpSession *session)

int	rtp_session_get_recv_payload_type (const RtpSession *session)

int	rtp_session_set_recv_payload_type (RtpSession *session, int pt)

int	rtp_session_set_send_telephone_event_payload_type (RtpSession *session, int paytype)

int	rtp_session_set_payload_type (RtpSession *session, int pt)

void	rtp_session_set_symmetric_rtp (RtpSession *session, bool_t yesno)

bool_t	rtp_session_get_symmetric_rtp (const RtpSession *session)

void	rtp_session_enable_rtcp_mux (RtpSession *session, bool_t yesno)

bool_t	rtp_session_rtcp_mux_enabled (RtpSession *session)

void	rtp_session_set_connected_mode (RtpSession *session, bool_t yesno)

void	rtp_session_enable_rtcp (RtpSession *session, bool_t yesno)

bool_t	rtp_session_rtcp_enabled (const RtpSession *session)

void	rtp_session_set_rtcp_report_interval (RtpSession *session, int value_ms)

void	rtp_session_set_target_upload_bandwidth (RtpSession *session, int target_bandwidth)

void	rtp_session_configure_rtcp_xr (RtpSession session, const OrtpRtcpXrConfiguration config)

void	rtp_session_set_rtcp_xr_media_callbacks (RtpSession session, const OrtpRtcpXrMediaCallbacks cbs)

void	rtp_session_set_ssrc_changed_threshold (RtpSession *session, int numpackets)

mblk_t *	rtp_session_recvm_with_ts (RtpSession *session, uint32_t user_ts)

mblk_t *	rtp_session_create_packet (RtpSession session, size_t header_size, const uint8_t payload, size_t payload_size)

mblk_t *	rtp_session_create_packet_raw (const uint8_t *packet, size_t packet_size)

mblk_t *	rtp_session_create_packet_with_data (RtpSession session, uint8_t payload, size_t payload_size, void(freefn)(void ))

mblk_t *	rtp_session_create_packet_in_place (RtpSession session, uint8_t buffer, size_t size, void(freefn)(void ))

int	rtp_session_sendm_with_ts (RtpSession session, mblk_t mp, uint32_t userts)

int	rtp_session_sendto (RtpSession session, bool_t is_rtp, mblk_t m, int flags, const struct sockaddr *destaddr, socklen_t destlen)

int	rtp_session_recvfrom (RtpSession session, bool_t is_rtp, mblk_t m, int flags, struct sockaddr from, socklen_t fromlen)

int	rtp_session_recv_with_ts (RtpSession session, uint8_t buffer, int len, uint32_t ts, int *have_more)

int	rtp_session_send_with_ts (RtpSession session, const uint8_t buffer, int len, uint32_t userts)

void	rtp_session_register_event_queue (RtpSession session, OrtpEvQueue q)

void	rtp_session_unregister_event_queue (RtpSession session, OrtpEvQueue q)

float	rtp_session_compute_send_bandwidth (RtpSession *session)

float	rtp_session_compute_recv_bandwidth (RtpSession *session)

float	rtp_session_get_send_bandwidth (RtpSession *session)

float	rtp_session_get_recv_bandwidth (RtpSession *session)

float	rtp_session_get_rtp_send_bandwidth (RtpSession *session)

float	rtp_session_get_rtp_recv_bandwidth (RtpSession *session)

float	rtp_session_get_rtcp_send_bandwidth (RtpSession *session)

float	rtp_session_get_rtcp_recv_bandwidth (RtpSession *session)

void	rtp_session_send_rtcp_APP (RtpSession session, uint8_t subtype, const char name, const uint8_t *data, int datalen)

int	rtp_session_rtcp_sendm_raw (RtpSession session, mblk_t m)

uint32_t	rtp_session_get_current_send_ts (RtpSession *session)

uint32_t	rtp_session_get_current_recv_ts (RtpSession *session)

void	rtp_session_flush_sockets (RtpSession *session)

void	rtp_session_release_sockets (RtpSession *session)

void	rtp_session_resync (RtpSession *session)

void	rtp_session_reset (RtpSession *session)

void	rtp_session_destroy (RtpSession *session)

const rtp_stats_t *	rtp_session_get_stats (const RtpSession *session)

const jitter_stats_t *	rtp_session_get_jitter_stats (const RtpSession *session)

void	rtp_session_reset_stats (RtpSession *session)

void	rtp_session_set_data (RtpSession session, void data)

void *	rtp_session_get_data (const RtpSession *session)

void	rtp_session_set_recv_buf_size (RtpSession *session, int bufsize)

void	rtp_session_set_rtp_socket_send_buffer_size (RtpSession *session, unsigned int size)

void	rtp_session_set_rtp_socket_recv_buffer_size (RtpSession *session, unsigned int size)

uint32_t	rtp_session_ts_to_time (RtpSession *session, uint32_t timestamp)

uint32_t	rtp_session_time_to_ts (RtpSession *session, int millisecs)

void	rtp_session_make_time_distorsion (RtpSession *session, int milisec)

void	rtp_session_set_source_description (RtpSession session, const char cname, const char name, const char email, const char phone, const char loc, const char tool, const char note)

void	rtp_session_add_contributing_source (RtpSession session, uint32_t csrc, const char cname, const char name, const char email, const char phone, const char loc, const char tool, const char note)

void	rtp_session_remove_contributing_source (RtpSession *session, uint32_t csrc)

mblk_t *	rtp_session_create_rtcp_sdes_packet (RtpSession *session, bool_t full)

void	rtp_session_get_last_recv_time (RtpSession session, struct timeval tv)

int	rtp_session_bye (RtpSession session, const char reason)

int	rtp_session_get_last_send_error_code (RtpSession *session)

void	rtp_session_clear_send_error_code (RtpSession *session)

int	rtp_session_get_last_recv_error_code (RtpSession *session)

void	rtp_session_clear_recv_error_code (RtpSession *session)

float	rtp_session_get_round_trip_propagation (RtpSession *session)

void	rtp_session_enable_network_simulation (RtpSession session, const OrtpNetworkSimulatorParams params)

void	rtp_session_rtcp_set_lost_packet_value (RtpSession *session, const int value)
	For test purpose only, sets a constant lost packet value within all RTCP output packets. . More...

void	rtp_session_rtcp_set_jitter_value (RtpSession *session, const unsigned int value)
	For test purpose only, sets a constant interarrival_jitter value within all RTCP output packets. . More...

void	rtp_session_rtcp_set_delay_value (RtpSession *session, const unsigned int value)
	For test purpose only, simulates a constant RTT (Round Trip Time) value by setting the LSR field within all returned RTCP output packets. . More...

mblk_t *	rtp_session_pick_with_cseq (RtpSession *session, const uint16_t sequence_number)

void	rtp_session_send_rtcp_xr_rcvr_rtt (RtpSession *session)

void	rtp_session_send_rtcp_xr_dlrr (RtpSession *session)

void	rtp_session_send_rtcp_xr_stat_summary (RtpSession *session)

void	rtp_session_send_rtcp_xr_voip_metrics (RtpSession *session)

bool_t	rtp_session_avpf_enabled (RtpSession *session)

bool_t	rtp_session_avpf_payload_type_feature_enabled (RtpSession *session, unsigned char feature)

bool_t	rtp_session_avpf_feature_enabled (RtpSession *session, unsigned char feature)

void	rtp_session_enable_avpf_feature (RtpSession *session, unsigned char feature, bool_t enable)

uint16_t	rtp_session_get_avpf_rr_interval (RtpSession *session)

bool_t	rtp_session_rtcp_psfb_scheduled (RtpSession *session, rtcp_psfb_type_t type)

bool_t	rtp_session_rtcp_rtpfb_scheduled (RtpSession *session, rtcp_rtpfb_type_t type)

void	rtp_session_send_rtcp_fb_generic_nack (RtpSession *session, uint16_t pid, uint16_t blp)

void	rtp_session_send_rtcp_fb_pli (RtpSession *session)

void	rtp_session_send_rtcp_fb_fir (RtpSession *session)

void	rtp_session_send_rtcp_fb_sli (RtpSession *session, uint16_t first, uint16_t number, uint8_t picture_id)

void	rtp_session_send_rtcp_fb_rpsi (RtpSession session, uint8_t bit_string, uint16_t bit_string_len)

void	rtp_session_send_rtcp_fb_tmmbr (RtpSession *session, uint64_t mxtbr)

void	rtp_session_send_rtcp_fb_tmmbn (RtpSession *session, uint32_t ssrc)

void	rtp_session_init (RtpSession *session, int mode)

void	rtp_session_uninit (RtpSession *session)

void	rtp_session_dispatch_event (RtpSession session, OrtpEvent ev)

void	rtp_session_set_reuseaddr (RtpSession *session, bool_t yes)

int	meta_rtp_transport_modifier_inject_packet_to_send (RtpTransport t, RtpTransportModifier tpm, mblk_t *msg, int flags)

int	meta_rtp_transport_modifier_inject_packet_to_send_to (RtpTransport t, RtpTransportModifier tpm, mblk_t msg, int flags, const struct sockaddr to, socklen_t tolen)

int	meta_rtp_transport_modifier_inject_packet_to_recv (RtpTransport t, RtpTransportModifier tpm, mblk_t *msg, int flags)

RtpTransport *	meta_rtp_transport_get_endpoint (const RtpTransport *transport)

void	meta_rtp_transport_set_endpoint (RtpTransport transport, RtpTransport endpoint)

void	meta_rtp_transport_destroy (RtpTransport *tp)

void	meta_rtp_transport_append_modifier (RtpTransport tp, RtpTransportModifier tpm)

int	rtp_session_splice (RtpSession session, RtpSession to_session)

int	rtp_session_unsplice (RtpSession session, RtpSession to_session)

Detailed Description

The RtpSession api.

The RtpSession objects represent a RTP session: once it is configured with local and remote network addresses and a payload type is given, it let you send and recv a media stream.

Typedef Documentation

typedef struct _JBParameters JBParameters

Jitter buffer parameters

typedef struct _OrtpNetworkSimulatorParams OrtpNetworkSimulatorParams

Structure describing the network simulator parameters

Enumeration Type Documentation

enum _OrtpNetworkSimulatorMode

Enumerator
OrtpNetworkSimulatorInbound	simulation is applied when receiving packets
OrtpNetworkSimulatorOutbound	simulation is applied to sent packets
OrtpNetworkSimulatorOutboundControlled	simulation is applied to sent packets according to sent timestamp set in the timestamp field of mblk_t, which is definied only with -DORTP_TIMESTAMP

Function Documentation

RtpTransport* meta_rtp_transport_get_endpoint ( const RtpTransport * transport )

get endpoint if any

Parameters

[in] transport RtpTransport object.

Returns: _RtpTransport

int meta_rtp_transport_modifier_inject_packet_to_recv	(	RtpTransport *	t,
		RtpTransportModifier *	tpm,
		mblk_t *	msg,
		int	flags
	)

allow a modifier to inject a packet which will be treated by successive modifiers

int meta_rtp_transport_modifier_inject_packet_to_send	(	RtpTransport *	t,
		RtpTransportModifier *	tpm,
		mblk_t *	msg,
		int	flags
	)

allow a modifier to inject a packet which will be treated by successive modifiers

int meta_rtp_transport_modifier_inject_packet_to_send_to	(	RtpTransport *	t,
		RtpTransportModifier *	tpm,
		mblk_t *	msg,
		int	flags,
		const struct sockaddr *	to,
		socklen_t	tolen
	)

allow a modifier to inject a packet which will be treated by successive modifiers

void meta_rtp_transport_set_endpoint	(	RtpTransport *	transport,
		RtpTransport *	endpoint
	)

set endpoint

Parameters

[in]	transport	RtpTransport object.
[in]	endpoint	RtpEndpoint.

int rtp_session_add_aux_remote_addr_full	(	RtpSession *	session,
		const char *	rtp_addr,
		int	rtp_port,
		const char *	rtcp_addr,
		int	rtcp_port
	)

rtp_session_add_remote_aux_addr_full:

Parameters

session	a rtp session freshly created.
rtp_addr	a local IP address in the xxx.xxx.xxx.xxx form.
rtp_port	a local rtp port.
rtcp_addr	a local IP address in the xxx.xxx.xxx.xxx form.
rtcp_port	a local rtcp port. Add an auxiliary remote address for the rtp session, ie a destination address where rtp packet are sent. Returns: 0 on success.

int rtp_session_bye	(	RtpSession *	session,
		const char *	reason
	)

Sends a RTCP bye packet.

Parameters

session	RtpSession
reason	the reason phrase.

mblk_t* rtp_session_create_packet	(	RtpSession *	session,
		size_t	header_size,
		const uint8_t *	payload,
		size_t	payload_size
	)

Allocates a new rtp packet. In the header, ssrc and payload_type according to the session's context. Timestamp is not set, it will be set when the packet is going to be sent with rtp_session_sendm_with_ts(). Sequence number is initalized to previous sequence number sent + 1 If payload_size is zero, thus an empty packet (just a RTP header) is returned.

Parameters

session	a rtp session.
header_size	the rtp header size. For standart size (without extensions), it is RTP_FIXED_HEADER_SIZE
payload	data to be copied into the rtp packet.
payload_size	size of data carried by the rtp packet.

Returns: a rtp packet in a mblk_t (message block) structure.

mblk_t* rtp_session_create_packet_in_place	(	RtpSession *	session,
		uint8_t *	buffer,
		size_t	size,
		void()(void )	freefn
	)

Creates a new rtp packet using the buffer given in arguments (no copy). In the header, ssrc and payload_type according to the session's context. Timestamp and seq number are not set, there will be set when the packet is going to be sent with rtp_session_sendm_with_ts(). freefn can be NULL, in that case payload will be kept untouched.

Parameters

session	a rtp session.
buffer	a buffer that contains first just enough place to write a RTP header, then the data to send.
size	the size of the buffer
freefn	a function that will be called once the buffer is no more needed (the data has been sent).

Returns: a rtp packet in a mblk_t (message block) structure.

mblk_t* rtp_session_create_packet_raw	(	const uint8_t *	packet,
		size_t	packet_size
	)

Create a packet already including headers

mblk_t* rtp_session_create_packet_with_data	(	RtpSession *	session,
		uint8_t *	payload,
		size_t	payload_size,
		void()(void )	freefn
	)

Creates a new rtp packet using the given payload buffer (no copy). The header will be allocated separetely. In the header, ssrc and payload_type according to the session's context. Timestamp and seq number are not set, there will be set when the packet is going to be sent with rtp_session_sendm_with_ts(). oRTP will send this packet using libc's sendmsg() (if this function is availlable!) so that there will be no packet concatenation involving copies to be done in user-space. freefn can be NULL, in that case payload will be kept untouched.

Parameters

session	a rtp session.
payload	the data to be sent with this packet
payload_size	size of data
freefn	a function that will be called when the payload buffer is no more needed.

Returns: : a rtp packet in a mblk_t (message block) structure.

void rtp_session_destroy ( RtpSession * session )

Destroys a rtp session. All memory allocated for the RtpSession is freed.

Parameters

session a rtp session.

void rtp_session_enable_rtcp	(	RtpSession *	session,
		bool_t	yesno
	)

By default oRTP automatically sends RTCP SR or RR packets. If yesno is set to FALSE, the RTCP sending of packet is disabled. This functionnality might be needed for some equipments that do not support RTCP, leading to a traffic of ICMP errors on the network. It can also be used to save bandwidth despite the RTCP bandwidth is actually and usually very very low.

void rtp_session_flush_sockets ( RtpSession * session )

rtp_session_flush_sockets:

Parameters

session a rtp session

Flushes the sockets for all pending incoming packets. This can be usefull if you did not listen to the stream for a while and wishes to start to receive again. During the time no receive is made packets get bufferised into the internal kernel socket structure.

int rtp_session_get_cum_loss ( RtpSession * session )

Returns the latest cumulative loss value computed

uint32_t rtp_session_get_current_recv_ts ( RtpSession * session )

Same thing as rtp_session_get_current_send_ts() except that it's for an incoming stream. Works only on scheduled mode.

Parameters

session a rtp session.

Returns: the theoritical that would have to be receive now.

uint32_t rtp_session_get_current_send_ts ( RtpSession * session )

When the rtp session is scheduled and has started to send packets, this function computes the timestamp that matches to the present time. Using this function can be usefull when sending discontinuous streams. Some time can be elapsed between the end of a stream burst and the begin of a new stream burst, and the application may be not not aware of this elapsed time. In order to get a valid (current) timestamp to pass to rtp_session_send_with_ts() or rtp_session_sendm_with_ts(), the application may use rtp_session_get_current_send_ts().

Parameters

session a rtp session.

Returns: the current send timestamp for the rtp session.

void* rtp_session_get_data ( const RtpSession * session )

Parameters

session a rtp session

Returns: the void pointer previously set using rtp_session_set_data()

int rtp_session_get_dscp ( const RtpSession * session )

rtp_session_get_dscp:

Parameters

session a rtp session

Returns the DSCP (Differentiated Services Code Point) for outgoing RTP packets.

const jitter_stats_t* rtp_session_get_jitter_stats ( const RtpSession * session )

Retrieves the session's jitter specific statistics.

void rtp_session_get_last_recv_time	(	RtpSession *	session,
		struct timeval *	tv
	)

Gets last time a valid RTP or RTCP packet was received.

Parameters

session	RtpSession to get last receive time from.
tv	Pointer to struct timeval to fill.

int rtp_session_get_local_port ( const RtpSession * session )

rtp_session_get_local_port:

Parameters

session

a rtp session for which rtp_session_set_local_addr() or rtp_session_set_remote_addr() has been called

    This function can be useful to retrieve the local port that was randomly choosen by
    rtp_session_set_remote_addr() when rtp_session_set_local_addr() was not called.

    Returns: the local port used to listen for rtp packets, -1 if not set.

int rtp_session_get_multicast_loopback ( RtpSession * session )

rtp_session_get_multicast_loopback:

Parameters

session a rtp session

Returns the multicast loopback state of rtp session (true or false).

int rtp_session_get_multicast_ttl ( RtpSession * session )

rtp_session_get_multicast_ttl:

Parameters

session a rtp session

Returns the TTL (Time-To-Live) for outgoing multicast packets.

RtpProfile* rtp_session_get_profile ( RtpSession * session )

Parameters

session

a rtp session

    DEPRECATED! Returns current send profile.
    Use rtp_session_get_send_profile() or rtp_session_get_recv_profile()

uint32_t rtp_session_get_rcv_ext_seq_number ( RtpSession * session )

Returns the highest extended sequence number received.

float rtp_session_get_recv_bandwidth ( RtpSession * session )

Get last computed recv bandwidth. Computation must have been done with rtp_session_compute_recv_bandwidth()

int rtp_session_get_recv_payload_type ( const RtpSession * session )

Parameters

session a rtp session

Returns: the payload type currently used in incoming rtp packets

RtpProfile* rtp_session_get_recv_profile ( RtpSession * session )

Parameters

session

a rtp session

    Returns current receive profile.

uint32_t rtp_session_get_recv_ssrc ( RtpSession * session )

Get the SSRC for the incoming stream.

If no packets have been received yet, 0 is returned.

float rtp_session_get_round_trip_propagation ( RtpSession * session )

Returns the last known round trip propagation delay.

This value is known after successful RTCP SR or RR exchanged between a sender and a receiver. oRTP automatically takes care of sending SR or RR packets. You might want to call this function when you receive an RTCP event (see rtp_session_register_event_queue() ). This value might not be known: at the beginning when no RTCP packets have been exchanged yet, or simply because the rtcp channel is broken due to firewall problematics, or because the remote implementation does not support RTCP.

Returns: the round trip propagation time in seconds if known, -1 if unknown.

float rtp_session_get_send_bandwidth ( RtpSession * session )

Get last computed send bandwidth. Computation must have been done with rtp_session_compute_send_bandwidth()

int rtp_session_get_send_payload_type ( const RtpSession * session )

Parameters

session a rtp session

Returns: the payload type currently used in outgoing rtp packets

RtpProfile* rtp_session_get_send_profile ( RtpSession * session )

Parameters

session

a rtp session

    Returns current send profile.

uint32_t rtp_session_get_send_ssrc ( RtpSession * session )

Get the SSRC for the outgoing stream.

Parameters

session a rtp session.

uint16_t rtp_session_get_seq_number ( RtpSession * session )

Get the current sequence number for outgoing stream.

const rtp_stats_t* rtp_session_get_stats ( const RtpSession * session )

Retrieve the session's statistics.

RtpSession* rtp_session_new ( int mode )

Creates a new rtp session. If the session is able to send data (RTP_SESSION_SENDONLY or RTP_SESSION_SENDRECV), then a random SSRC number is choosed for the outgoing stream.

Parameters

mode	One of the RtpSessionMode flags.

Returns: the newly created rtp session.

mblk_t* rtp_session_pick_with_cseq	(	RtpSession *	session,
		const uint16_t	sequence_number
	)

Try to get an rtp packet presented as a mblk_t structure from the rtp session at a given sequence number. This function is very usefull for codec with Forward error correction capabilities

This function returns the entire packet (with header).

Parameters

session a rtp session.

sequence_number a sequence number.

Returns
a rtp packet presented as a mblk_t, or NULL if not found.

int rtp_session_recv_with_ts	(	RtpSession *	session,
		uint8_t *	buffer,
		int	len,
		uint32_t	ts,
		int *	have_more
	)

NOTE: use of this function is discouraged when sending payloads other than pcm/pcmu/pcma/adpcm types. rtp_session_recvm_with_ts() does better job.

Tries to read the bytes of the incoming rtp stream related to timestamp ts. In case where the user supplied buffer buffer is not large enough to get all the data related to timestamp ts, then *( have_more) is set to 1 to indicate that the application should recall the function with the same timestamp to get more data.

When the rtp session is scheduled (see rtp_session_set_scheduling_mode() ), and the blocking mode is on (see rtp_session_set_blocking_mode() ), then the calling thread is suspended until the timestamp given as argument expires, whatever a received packet fits the query or not.

Important note: it is clear that the application cannot know the timestamp of the first packet of the incoming stream, because it can be random. The ts timestamp given to the function is used relatively to first timestamp of the stream. In simple words, 0 is a good value to start calling this function.

This function internally calls rtp_session_recvm_with_ts() to get a rtp packet. The content of this packet is then copied into the user supplied buffer in an intelligent manner: the function takes care of the size of the supplied buffer and the timestamp given in argument. Using this function it is possible to read continous audio data (e.g. pcma,pcmu...) with for example a standart buffer of size of 160 with timestamp incrementing by 160 while the incoming stream has a different packet size.

Returns: if a packet was availlable with the corresponding timestamp supplied in argument then the number of bytes written in the user supplied buffer is returned. If no packets are availlable, either because the sender has not started to send the stream, or either because silence packet are not transmitted, or either because the packet was lost during network transport, then the function returns zero.

Parameters

session	a rtp session.
buffer	a user supplied buffer to write the data.
len	the length in bytes of the user supplied buffer.
ts	the timestamp wanted.
have_more	the address of an integer to indicate if more data is availlable for the given timestamp.

mblk_t* rtp_session_recvm_with_ts	(	RtpSession *	session,
		uint32_t	user_ts
	)

Try to get a rtp packet presented as a mblk_t structure from the rtp session. The user_ts parameter is relative to the first timestamp of the incoming stream. In other words, the application does not have to know the first timestamp of the stream, it can simply call for the first time this function with user_ts=0, and then incrementing it as it want. The RtpSession takes care of synchronisation between the stream timestamp and the user timestamp given here.

This function returns the entire packet (with header).

The behaviour of this function has changed since version 0.15.0. Previously the payload data could be accessed using mblk_t::b_cont::b_rptr field of the returned mblk_t. This is no more the case. The convenient way of accessing the payload data is to use rtp_get_payload() :

 unsigned char *payload;
 int payload_size;
 payload_size=rtp_get_payload(mp,&payload);

OR simply skip the header this way, the data is then comprised between mp->b_rptr and mp->b_wptr:

1 rtp_get_payload(mp,&mp->b_rptr);

Parameters

session	a rtp session.
user_ts	a timestamp.

Returns: a rtp packet presented as a mblk_t.

void rtp_session_refresh_sockets ( RtpSession * session )

Requests the session to re-create and bind its RTP and RTCP sockets same as they are currently. This is used when a change in the routing rules of the host or process was made, in order to have this routing rules change taking effect on the RTP/RTCP packets sent by the session.

void rtp_session_register_event_queue	(	RtpSession *	session,
		OrtpEvQueue *	q
	)

Register an event queue. An application can use an event queue to get informed about various RTP events.

void rtp_session_release_sockets ( RtpSession * session )

Closes the rtp and rtcp sockets, and associated RtpTransport.

void rtp_session_reset ( RtpSession * session )

Reset the session: local and remote addresses are kept. It resets timestamp, sequence number, and calls rtp_session_resync().

Parameters

session a rtp session.

void rtp_session_resync ( RtpSession * session )

Resynchronize to the incoming RTP streams. This can be useful to handle discontinuous timestamps. For example, call this function from the timestamp_jump signal handler.

Parameters

session the rtp session

int rtp_session_rtcp_sendm_raw	(	RtpSession *	session,
		mblk_t *	m
	)

Send the rtcp datagram packet to the destination set by rtp_session_set_remote_addr() The packet (packet) is freed once it is sent.

Parameters

session	a rtp session.
m	a rtcp packet presented as a mblk_t.

Returns: the number of bytes sent over the network.

void rtp_session_rtcp_set_delay_value	(	struct _RtpSession *	s,
		const unsigned int	value
	)

For test purpose only, simulates a constant RTT (Round Trip Time) value by setting the LSR field within all returned RTCP output packets.
.

The RTT processing involves two RTCP packets exchanged between two different devices.
In a normal operation the device 1 issues a SR packets at time T0, hence this packet has a timestamp field set to T0. The LSR and DLSR fiels of that packet are not considered here. This packet is received by the Device 2 at T1. In response, the Device 2 issues another SR or RR packets at T2 with the following fields;

a timestamp set to T2.
a LSR (Last SR packet timestamp) field set to T0 ( this value has been extracted from the first packet).
a DLSR (Delay since Last SR packet) field set to (T2 - T1).

This packet is received by The Device 1 at T3. So the Device 1 is now able to process the RTT using the formula : RTT = T3 - LSR - DLSR = (T1 - T0) - (T3 - T2).
This way of processing is described in par. 6.4 of the RFC3550 standard.

In the test mode that is enabled by this procedure, the RTCP stack is considered as beeing part of the device 2. For setting the RTT to a constant RTT0 value, the Device 2 artificially sets the LSR field of the second packet to (T1 - RTT0), instead of T0 in normal mode. The two other fields (timestamp and DLSR) are set as in the normal mode. So the Device 1 will process : RTT = T3 - LSR - DLSR = RTT0 + (T3 - T2) that is near to RTT0 is T3 - T2 is small enough.

Note: It is impossible to actually make the mesured RTT strictly equal to RTT0, as the packet trip time (T3 - T2) is unknown when this packet is issued by the Device 2.

Parameters

s	: the rtp session.
value	: The desired RTT test vector value (RTT0).

void rtp_session_rtcp_set_jitter_value	(	struct _RtpSession *	s,
		const unsigned int	value
	)

For test purpose only, sets a constant interarrival_jitter value within all RTCP output packets.
.

The SR or RR RTCP packet contain an interarrival jitter field. After this procedure is called, the interarrival jitter field will be set to a constant value in all output SR or RR packets. This parameter will overridden the actual interarrival jitter value that was processed by the RTCP stack.

Parameters

s	: the rtp session.
value	: the interarrival jitter test vector value.

void rtp_session_rtcp_set_lost_packet_value	(	struct _RtpSession *	s,
		const int	value
	)

For test purpose only, sets a constant lost packet value within all RTCP output packets.
.

The SR or RR RTCP packet contain a lost packet field. After this procedure is called, the lost packet field will be set to a constant value in all output SR or RR packets. This parameter will overridden the actual number of lost packets in the input RTP stream that the RTCP stack had previously processed.

Parameters

s	: the rtp session.
value	: the lost packets test vector value.

int rtp_session_send_with_ts	(	RtpSession *	session,
		const uint8_t *	buffer,
		int	len,
		uint32_t	userts
	)

Send a rtp datagram to the destination set by rtp_session_set_remote_addr() containing the data from buffer with timestamp userts. This is a high level function that uses rtp_session_create_packet() and rtp_session_sendm_with_ts() to send the data.

Parameters

session	a rtp session.
buffer	a buffer containing the data to be sent in a rtp packet.
len	the length of the data buffer, in bytes.
userts	the timestamp of the data to be sent. Refer to the rfc to know what it is.

Returns: the number of bytes sent over the network.

int rtp_session_sendm_with_ts	(	RtpSession *	session,
		mblk_t *	packet,
		uint32_t	timestamp
	)

Send the rtp datagram packet to the destination set by rtp_session_set_remote_addr() with timestamp timestamp. For audio data, the timestamp is the number of the first sample resulting of the data transmitted. See rfc1889 for details. The packet (packet) is freed once it is sent.

Parameters

session	a rtp session.
packet	a rtp packet presented as a mblk_t.
timestamp	the timestamp of the data to be sent.

Returns: the number of bytes sent over the network.

void rtp_session_set_blocking_mode	(	RtpSession *	session,
		int	yesno
	)

This function implicitely enables the scheduling mode if yesno is TRUE. rtp_session_set_blocking_mode() defines the behaviour of the rtp_session_recv_with_ts() and rtp_session_send_with_ts() functions. If yesno is TRUE, rtp_session_recv_with_ts() will block until it is time for the packet to be received, according to the timestamp passed to the function. After this time, the function returns. For rtp_session_send_with_ts(), it will block until it is time for the packet to be sent. If yesno is FALSE, then the two functions will return immediately.

Parameters

session	a rtp session
yesno	a boolean

void rtp_session_set_connected_mode	(	RtpSession *	session,
		bool_t	yesno
	)

If yesno is TRUE, thus a connect() syscall is done on the socket to the destination address set by rtp_session_set_remote_addr(), or if the session does symmetric rtp (see rtp_session_set_symmetric_rtp()) a the connect() is done to the source address of the first packet received. Connecting a socket has effect of rejecting all incoming packets that don't come from the address specified in connect(). It also makes ICMP errors (such as connection refused) available to the application.

Parameters

session	a rtp session
yesno	a boolean to enable or disable the feature

void rtp_session_set_data	(	RtpSession *	session,
		void *	data
	)

Stores some application specific data into the session, so that it is easy to retrieve it from the signal callbacks using rtp_session_get_data().

Parameters

session	a rtp session
data	an opaque pointer to be stored in the session

int rtp_session_set_dscp	(	RtpSession *	session,
		int	dscp
	)

rtp_session_set_dscp:

Parameters

session	a rtp session
dscp	desired DSCP PHB value

Sets the DSCP (Differentiated Services Code Point) for outgoing RTP packets.

Returns: 0 on success.

void rtp_session_set_jitter_compensation	(	RtpSession *	session,
		int	milisec
	)

Parameters

session	a RtpSession
milisec	the time interval in milisec to be jitter compensed.

Sets the time interval for which packet are buffered instead of being delivered to the application.

int rtp_session_set_local_addr	(	RtpSession *	session,
		const char *	addr,
		int	rtp_port,
		int	rtcp_port
	)

rtp_session_set_local_addr:

Parameters

session	a rtp session freshly created.
addr	a local IP address in the xxx.xxx.xxx.xxx form.
rtp_port	a local port or -1 to let oRTP choose the port randomly
rtcp_port	a local port or -1 to let oRTP choose the port randomly Specify the local addr to be use to listen for rtp packets or to send rtp packet from. In case where the rtp session is send-only, then it is not required to call this function: when calling rtp_session_set_remote_addr(), if no local address has been set, then the default INADRR_ANY (0.0.0.0) IP address with a random port will be used. Calling rtp_session_set_local_addr() is mandatory when the session is recv-only or duplex. Returns: 0 on success.

int rtp_session_set_multicast_loopback	(	RtpSession *	session,
		int	yesno
	)

Parameters

session	a rtp session
yesno	desired Multicast Time-To-Live

Sets the TTL (Time-To-Live) for outgoing multicast packets.

Returns: 0 on success.

int rtp_session_set_multicast_ttl	(	RtpSession *	session,
		int	ttl
	)

rtp_session_set_multicast_ttl:

Parameters

session	a rtp session
ttl	desired Multicast Time-To-Live

Sets the TTL (Time-To-Live) for outgoing multicast packets.

Returns: 0 on success.

int rtp_session_set_payload_type	(	RtpSession *	session,
		int	pt
	)

Sets the expected payload type for incoming packets and payload type to be used for outgoing packets. If the actual payload type in incoming packets is different that this expected payload type, thus the "payload_type_changed" signal is emitted.

Parameters

session	a rtp session
pt	the payload type number

Returns: 0 on success, -1 if the payload is not defined.

int rtp_session_set_pktinfo	(	RtpSession *	session,
		int	activate
	)

rtp_session_set_pktinfo:

Parameters

session	a rtp session
activate	activation flag (0 to deactivate, other value to activate)

(De)activates packet info for incoming and outgoing packets.

Returns: 0 on success.

void rtp_session_set_profile	(	RtpSession *	session,
		RtpProfile *	profile
	)

Set the RTP profile to be used for the session. By default, all session are created by rtp_session_new() are initialized with the AV profile, as defined in RFC 3551. The application can set any other profile instead using that function.

Parameters

session	a rtp session
profile	a rtp profile

void rtp_session_set_recv_buf_size	(	RtpSession *	session,
		int	bufsize
	)

The default value is UDP_MAX_SIZE bytes, a value which is working for mostly everyone. However if your application can make assumption on the sizes of received packet, it can be interesting to set it to a lower value in order to save memory.

Parameters

session	a rtp session
bufsize	max size in bytes for receiving packets

int rtp_session_set_recv_payload_type	(	RtpSession *	session,
		int	paytype
	)

Sets the expected payload type for incoming packets. If the actual payload type in incoming packets is different that this expected payload type, thus the "payload_type_changed" signal is emitted.

Parameters

session	a rtp session
paytype	the payload type number

Returns: 0 on success, -1 if the payload is not defined.

void rtp_session_set_recv_profile	(	RtpSession *	session,
		RtpProfile *	profile
	)

Set the RTP profile to be used for the receiveing by this session. By default, all session are created by rtp_session_new() are initialized with the AV profile, as defined in RFC 3551. The application can set any other profile instead using that function.

Parameters

session	a rtp session
profile	a rtp profile

int rtp_session_set_remote_addr	(	RtpSession *	session,
		const char *	addr,
		int	port
	)

rtp_session_set_remote_addr:

Parameters

session a rtp session freshly created.

addr a local IP address in the xxx.xxx.xxx.xxx form.

port

a local port.

    Sets the remote address of the rtp session, ie the destination address where rtp packet
    are sent. If the session is recv-only or duplex, it also sets the origin of incoming RTP
    packets. Rtp packets that don't come from addr:port are discarded.

    Returns: 0 on success.

int rtp_session_set_remote_addr_full	(	RtpSession *	session,
		const char *	rtp_addr,
		int	rtp_port,
		const char *	rtcp_addr,
		int	rtcp_port
	)

rtp_session_set_remote_addr_full:

Parameters

session	a rtp session freshly created.
rtp_addr	a local IP address in the xxx.xxx.xxx.xxx form.
rtp_port	a local rtp port.
rtcp_addr	a local IP address in the xxx.xxx.xxx.xxx form.
rtcp_port	a local rtcp port. Sets the remote address of the rtp session, ie the destination address where rtp packet are sent. If the session is recv-only or duplex, it also sets the origin of incoming RTP packets. Rtp packets that don't come from addr:port are discarded. Returns: 0 on success.

void rtp_session_set_rtcp_report_interval	(	RtpSession *	session,
		int	value_ms
	)

Sets the default interval in milliseconds for RTCP reports emitted by the session

void rtp_session_set_rtp_socket_recv_buffer_size	(	RtpSession *	session,
		unsigned int	size
	)

Set kernel recv maximum buffer size for the rtp socket. A value of zero defaults to the operating system default.

void rtp_session_set_rtp_socket_send_buffer_size	(	RtpSession *	session,
		unsigned int	size
	)

Set kernel send maximum buffer size for the rtp socket. A value of zero defaults to the operating system default.

void rtp_session_set_scheduling_mode	(	RtpSession *	session,
		int	yesno
	)

Sets the scheduling mode of the rtp session. If yesno is TRUE, the rtp session is in the scheduled mode, that means that you can use session_set_select() to block until it's time to receive or send on this session according to the timestamp passed to the respective functions. You can also use blocking mode (see rtp_session_set_blocking_mode() ), to simply block within the receive and send functions. If yesno is FALSE, the ortp scheduler will not manage those sessions, meaning that blocking mode and the use of session_set_select() for this session are disabled.

Parameters

session	a rtp session.
yesno	a boolean to indicate the scheduling mode.

int rtp_session_set_send_payload_type	(	RtpSession *	session,
		int	paytype
	)

Sets the payload type of the rtp session. It decides of the payload types written in the of the rtp header for the outgoing stream, if the session is SENDRECV or SENDONLY. For payload type in incoming packets, the application can be informed by registering for the "payload_type_changed" signal, so that it can make the necessary changes on the downstream decoder that deals with the payload of the packets.

Parameters

session	a rtp session
paytype	the payload type number

Returns: 0 on success, -1 if the payload is not defined.

void rtp_session_set_send_profile	(	RtpSession *	session,
		RtpProfile *	profile
	)

Set the RTP profile to be used for the sending by this session. By default, all session are created by rtp_session_new() are initialized with the AV profile, as defined in RFC 3551. The application can set any other profile instead using that function.

Parameters

session	a rtp session
profile	a rtp profile

int rtp_session_set_send_telephone_event_payload_type	(	RtpSession *	session,
		int	paytype
	)

Assign the payload type number for sending telephone-event. It is required that a "telephone-event" PayloadType is assigned in the RtpProfile set for the RtpSession. This function is in most of cases useless, unless there is an ambiguity where several PayloadType for "telephone-event" are present in the RtpProfile. This might happen during SIP offeranswer scenarios. This function allows to remove any ambiguity by letting the application choose the one to be used.

Parameters

session	the RtpSession
paytype	the payload type number

Returns: 0, -1 on error.

void rtp_session_set_seq_number	(	RtpSession *	session,
		uint16_t	seq
	)

Set the initial sequence number for outgoing stream..

Parameters

session	a rtp session freshly created.
seq	a 16 bit unsigned number.

void rtp_session_set_source_description	(	RtpSession *	session,
		const char *	cname,
		const char *	name,
		const char *	email,
		const char *	phone,
		const char *	loc,
		const char *	tool,
		const char *	note
	)

Set session's SDES item for automatic sending of RTCP compound packets. If some items are not specified, use NULL.

void rtp_session_set_ssrc	(	RtpSession *	session,
		uint32_t	ssrc
	)

Sets the SSRC for the outgoing stream. If not done, a random ssrc is used.

Parameters

session	a rtp session.
ssrc	an unsigned 32bit integer representing the synchronisation source identifier (SSRC).

void rtp_session_set_ssrc_changed_threshold	(	RtpSession *	session,
		int	numpackets
	)

Sets the number of packets containing a new SSRC that will trigger the "ssrc_changed" callback.

void rtp_session_set_symmetric_rtp	(	RtpSession *	session,
		bool_t	yesno
	)

Enable or disable the "rtp symmetric" hack which consists of the following: after the first packet is received, the source address of the packet is set to be the destination address for all next packets. This is useful to pass-through firewalls.

Parameters

session	a rtp session
yesno	a boolean to enable or disable the feature

void rtp_session_set_time_jump_limit	(	RtpSession *	session,
		int	milisecs
	)

oRTP has the possibility to inform the application through a callback registered with rtp_session_signal_connect about crazy incoming RTP stream that jumps from a timestamp N to N+some_crazy_value. This lets the opportunity for the application to reset the session in order to resynchronize, or any other action like stopping the call and reporting an error.

Parameters

session	the rtp session
milisecs	a time interval in miliseconds

int rtp_session_signal_connect	(	RtpSession *	session,
		const char *	signal_name,
		RtpCallback	cb,
		void *	user_data
	)

This function provides the way for an application to be informed of various events that may occur during a rtp session. signal_name is a string identifying the event, and cb is a user supplied function in charge of processing it. The application can register several callbacks for the same signal, in the limit of RTP_CALLBACK_TABLE_MAX_ENTRIES. Here are name and meaning of supported signals types:

"ssrc_changed" : the SSRC of the incoming stream has changed.

"payload_type_changed" : the payload type of the incoming stream has changed.

"telephone-event_packet" : a telephone-event rtp packet (RFC2833) is received.

"telephone-event" : a telephone event has occured. This is a high-level shortcut for "telephone-event_packet".

"network_error" : a network error happened on a socket. Arguments of the callback functions are a const char * explaining the error, an int errno error code and the user_data as usual.

"timestamp_jump" : we have received a packet with timestamp in far future compared to last timestamp received. The farness of far future is set by rtp_sesssion_set_time_jump_limit() "rtcp_bye": we have received a RTCP bye packet. Arguments of the callback functions are a const char * containing the leaving reason and the user_data.

Returns: 0 on success, -EOPNOTSUPP if the signal does not exists, -1 if no more callbacks can be assigned to the signal type.

Parameters

session	a rtp session
signal_name	the name of a signal
cb	a RtpCallback
user_data	a pointer to any data to be passed when invoking the callback.

int rtp_session_signal_disconnect_by_callback	(	RtpSession *	session,
		const char *	signal_name,
		RtpCallback	cb
	)

Removes callback function cb to the list of callbacks for signal signal.

Parameters

session	a rtp session
signal_name	a signal name
cb	a callback function.

Returns: : 0 on success, a negative value if the callback was not found.

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Detailed Description

Typedef Documentation

Enumeration Type Documentation

Function Documentation