roc::packet::RTP Struct Reference

RTP packet. More...

#include <rtp.h>

Public Member Functions
	RTP ()
	Construct zero RTP packet.
int	compare (const RTP &) const
	Determine packet order.

Public Attributes
stream_source_t	source_id
	Packet source ID identifying packet stream ("ssrc").
seqnum_t	seqnum
	Packet sequence number in packet stream ("sn").
stream_timestamp_t	stream_timestamp
	Packet stream timestamp ("sts").
stream_timestamp_t	duration
	Packet duration.
core::nanoseconds_t	capture_timestamp
	Packet capture timestamp ("cts").
bool	marker
	Packet marker bit ("m").
unsigned int	payload_type
	Packet payload type ("pt").
core::Slice< uint8_t >	header
	Packet header.
core::Slice< uint8_t >	payload
	Packet payload.
core::Slice< uint8_t >	padding
	Packet padding.

Detailed Description

RTP packet.

Definition at line 24 of file rtp.h.

Constructor & Destructor Documentation

RTP()

roc::packet::RTP::RTP

(

)

Construct zero RTP packet.

Member Function Documentation

compare()

int roc::packet::RTP::compare

(

const RTP &

)

const

Determine packet order.

Member Data Documentation

capture_timestamp

core::nanoseconds_t roc::packet::RTP::capture_timestamp

Packet capture timestamp ("cts").

Remarks

Describes capture time of the first sample using local Unix-time clock. This clock belongs to local system, no matter if we're on sender or receiver. On sender, capture timestamp is assigned to the system time of sender when the first sample in the packet was captured. On receiver, capture timestamp is assigned an estimation of the same value, converted to receiver system clock, i.e. the system time of receiver when the first sample in the packet was captured on sender. This field does not directly correspond to anything inside RTP packet. Instead, receiver deduces this value based on "timestamp" field from RTP packet, current NTP time, and mapping of NTP timestamps to RTP timestamps retrieved via RTCP.

Definition at line 68 of file rtp.h.

duration

stream_timestamp_t roc::packet::RTP::duration

Packet duration.

Remarks

Duration is measured in the same units as timestamp. Duration is not stored directly in RTP header. It is calculated from packet size.

Definition at line 53 of file rtp.h.

header

core::Slice<uint8_t> roc::packet::RTP::header

Packet header.

Definition at line 79 of file rtp.h.

marker

bool roc::packet::RTP::marker

Packet marker bit ("m").

Remarks

Marker bit meaning depends on packet type.

Definition at line 73 of file rtp.h.

padding

core::Slice<uint8_t> roc::packet::RTP::padding

Packet padding.

Remarks

Not included in header and payload, but affects overall packet size.

Definition at line 89 of file rtp.h.

payload

core::Slice<uint8_t> roc::packet::RTP::payload

Packet payload.

Remarks

Doesn't include RTP headers and padding.

Definition at line 84 of file rtp.h.

payload_type

unsigned int roc::packet::RTP::payload_type

Packet payload type ("pt").

Definition at line 76 of file rtp.h.

seqnum

seqnum_t roc::packet::RTP::seqnum

Packet sequence number in packet stream ("sn").

Remarks

Packets are numbered sequentaly in every stream, starting from some random value. May overflow.

Definition at line 35 of file rtp.h.

source_id

stream_source_t roc::packet::RTP::source_id

Packet source ID identifying packet stream ("ssrc").

Remarks

Sequence numbers and timestamp are numbered independently inside different packet streams.

Definition at line 29 of file rtp.h.

stream_timestamp

stream_timestamp_t roc::packet::RTP::stream_timestamp

Packet stream timestamp ("sts").

Remarks

Describes position of the first sample using abstract stream clock. This clock belongs to sender and has sample rate of the stream. For example, if sender is 44100Hz audio card, then stream timestamp is incremented by one each generated sample, and it happens 44100 times per second, according to audio card clock. This timestamp corresponds to "timestamp" field of RTP packet. Just like seqnum, it starts from random value and may overflow.

Definition at line 46 of file rtp.h.

---

The documentation for this struct was generated from the following file:

• roc_packet/rtp.h