RTP T esting Strategies Colin P erkins < c.p - - PowerPoint PPT Presentation

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rtp t esting strategies colin p erkins c p erkins cs ucl

Aug 27, 2022 25 likes •155 views

RTP T esting Strategies Colin P erkins < c.p erkins@cs.ucl.ac.uk > Depa rtment of Computer Science Universit y College London Go w er Street London W C1E 6BT Objectives A new draft (draft-ietf-avt-rtptest-00.txt)

SLIDE 1 RTP T esting Strategies Colin P erkins <c.p erkins@cs.ucl.ac.uk> Depa rtment

Computer Science Universit y College London Go w er Street London W C1E 6BT

SLIDE 2 Objectives A new draft (draft-ietf-avt-rtptest-00.txt) suggests means b y which RTP implementations ma y b e tested, to

help

demonstrate interop erabilit y

illustrate

common implementation erro rs This is not a set

confo rmance tests! Colin P erkins/RTP T esting Strategies/1

SLIDE 3 F unctions tested

systems { Media transp

{ Basic RTCP including SR/RR, reaction to loss { RTCP SDES, BYE, APP

ranslato rs

Mixers

Colin P erkins/RTP T esting Strategies/2

SLIDE 4 Media T ransp

{ T est Scena rio +-------

+-------+ Test instrumen t +-----+ | +-------

| | | +-------

+-------+

| +-------

+--------

est instrument can dela y

drop pack ets passing b et w een the t w

implementations
T

est instrument can reco rd pack et contents fo r analysis Colin P erkins/RTP T esting Strategies/3

SLIDE 5 Media T ransp

{ RTP T ests T est instrument fo rw a rds pack ets with no loss

dela y . V erify exchange

media with a va riet y

co decs, including the follo wing edge conditions:

Timestamp

& sequence numb er wrapa round

adding, ma rk er bit, header extension

Sequence

numb er increment, random sta rt value

Timestamp

increment and, random sta rt value

Random

choice

SSRC Colin P erkins/RTP T esting Strategies/4

SLIDE 6 Media T ransp

{ Basic RTCP T ests T est instrument fo rw a rds pack ets with no loss

dela y . V erify the follo wing:

Structure
f

comp

RTCP pack ets

Consistency
f

SR/RR headers with the data pack ets b eing sent

pack ets sho w lo w jitter and no loss

SDES

pack ets { esp ecially CNAME { and their co rrectness

pack ets { including `reason fo r leaving' text Colin P erkins/RTP T esting Strategies/5

SLIDE 7 Media T ransp

{ Advanced RTCP T ests T est instrument va riously inserts dela y and/o r loss. V erify the follo wing:

Loss

fraction in RR matches loss generated

Jitter

in RR va ries with dela y generated V erify pla y

media streams subject to small amount

dela y/loss. Colin P erkins/RTP T esting Strategies/6

SLIDE 8 T ranslato rs { T est Scena rio +-------

+-------+ RTP Translator +-----+ | +-------

| | | +-------

+-------+

| +-------

+--------

Simil a r to p revious tests, but with the translato r fo rw a rding pack ets b et w een the implementations. Colin P erkins/RTP T esting Strategies/7

SLIDE 9 T ranslato rs { T ests

translated stream

a rding

RTCP pack ets

Check

that translated SR/RR match the translation Details dep end

the translation, so ha rd to give exact tests. Colin P erkins/RTP T esting Strategies/8

SLIDE 10 Mixers { T est Scena rio +-------

| Second RTP | | implement at io n | +-------

| | +-------

+-------+ RTP Mixer +-----+ | +-------

| | | +-------

+------- +-

+-------

Colin P erkins/RTP T esting Strategies/9

SLIDE 11 Mixers { T ests

mixed stream

is set to 2 and CSRC list is p resent in RTP pack ets

pack ets have SSRC

the mixer

pack ets generated to w a rds sender

pack ets generated to w a rds receivers

a rding

SDES pack ets

a rding

BYEs, generation

BYE when mixer quits Colin P erkins/RTP T esting Strategies/10

SLIDE 12 T

do...
T

ests fo r lo

detection algo rithm

ests fo r encrypted media

Merge

with the RTCP testing draft? Colin P erkins/RTP T esting Strategies/11

SLIDE 13 F utures...

this so rt

do cument a go

idea?

e an info rmational RF C giving testing strategies fo r RTP implementations? Colin P erkins/RTP T esting Strategies/12