osmo_twjit_rr_info Struct Reference

Info collected from the incoming RTP data stream for the purpose of generating RTCP reception report blocks. More...

#include <twjit.h>

Data Fields
uint32_t	ssrc
	received SSRC to which all following info applies
uint32_t	rx_packets
	count of "received packets" for RTCP RR packet loss calculation
uint32_t	base_seq
	"base" sequence number for "expected packets" computation
uint32_t	max_seq_ext
	"extended highest sequence number" field of RTCP RR
uint32_t	expected_pkt
	count of "expected packets" for RTCP RR packet loss calculation
uint32_t	jitter_accum
	"interarrival jitter" measure of RFC 3550, accumulator for the leaky integrator algorithm prescribed by the RFC, sans-FP version. More...

Detailed Description

Info collected from the incoming RTP data stream for the purpose of generating RTCP reception report blocks.

See twrtp guide document section 5.1.

Key point: unlike the counters in struct osmo_twjit_stats, all RR info is reset to initial whenever incoming SSRC changes, as necessitated by RTCP data model being organized per SSRC.

The same ABI considerations apply to this struct as osmo_twjit_stats.

Field Documentation

jitter_accum

uint32_t osmo_twjit_rr_info::jitter_accum

"interarrival jitter" measure of RFC 3550, accumulator for the leaky integrator algorithm prescribed by the RFC, sans-FP version.

Right-shift this accumulator by 4 bits when emitting RTCP RR.

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

• include/osmocom/netif/twjit.h