Speak: Simple VoIP Application Project 2
Speak
A Simple VoIP Application
Project 2
Due date: March 3
rd
by 11:59pm
Overview
•
VoIP
–
Been able to do this (well) for at least 20 years
–
Web and Internet made Internet telephony possible,
cheaper
increasingly popular
•
Basic
–
Two-person
–
System parameters to evaluate quality
–
Speech detection
•
Simpler version than Project 1
–
Minimal interface
•
Load time options for connection, parameters …
Details
•
Windows or Linux (or Mac)
–
Two boxes, actually
•
Internet sockets
–
Specify host (and port)
–
TCP and UDP
•
Variable chunk sizes (emulate latency)
–
20, 40, 60 ms are typical
–
Also support values up to 1000 ms
More Details
•
Basic speech detection
–
Modified from project 1
–
250 ms search for zero crossing too big!
–
Detect based on energy level only
•
Sample only “chunk” from audio device
•
Tune thresholds to be effective
–
Can have on or off
•
Packet “Loss”
–
Drop before sending, or after receiving (your choice)
–
Percent, uniform randomly distributed
Hints
•
Many different architectural possibilities
–
Can design how you want
•
Provide some sample code (“tools”)
–
Refer to other samples, but write your own code (and
reference any others)
•
Consider remote development (not at console)
–
“Pre-Record” some conversation
–
Read from file or device
–
Write to file or device
–
Allow development of system code
–
Also good for one person testing
Sample Code
Linux/Cygwin
•
Basic TCP sockets:
talk-tcp.c
and
listen-tcp.c
•
Basic UDP sockets:
talk-
udp.c
and
listen-udp.c
•
Setting a timer:
setitimer.c
•
POSIX threads:
add2.c
•
Multiple interrupts:
select.c
•
Parsing command line
parameters:
get-opt.c
Windows
•
A simple header file to
generate error messages for
Winsock errors:
sockerr.h
•
Basic TCP sockets:
tcp-
talk.cpp
,
tcp-listen.cpp
•
Basic UDP sockets:
udp-
talk.cpp
,
udp-listen.cpp
•
Get the IP address of a
host:
getIPaddress.cpp
Hand-In
•
Email a tar/zip file
–
Use your name as the directory
•
Include
–
All source code and Makefile
–
README file with instructions on running
•
Due end of day when due
Grading
60%
Basic 2-way VoIP Application (TCP
or
UDP),
with parameters.
15%
Uses both UDP
and
TCP.
5%
Supports Speech Detection.
5%
Works under all “Loss” parameters.
5%
Works under all “Delay” parameters.
10%
Clear, well-written code, including comments.
Should be easy to "read" and understand.
Grading rubric available online
Develop a basic two-person VoIP application with speech detection capabilities using TCP and UDP protocols. The project involves evaluating speech quality, simulating latency, implementing speech detection based on energy levels, and handling packet loss. Explore various architectural possibilities, provide sample code for reference, and submit the project as a tar/zip file by the due date.
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Presentation Transcript
Speak A Simple VoIP Application Project 2 Due date: March 3rdby 11:59pm
Overview VoIP Been able to do this (well) for at least 20 years Web and Internet made Internet telephony possible, cheaper increasingly popular Basic Two-person System parameters to evaluate quality Speech detection Simpler version than Project 1 Minimal interface Load time options for connection, parameters
Details Windows or Linux (or Mac) Two boxes, actually Internet sockets Specify host (and port) TCP and UDP Variable chunk sizes (emulate latency) 20, 40, 60 ms are typical Also support values up to 1000 ms
More Details Basic speech detection Modified from project 1 250 ms search for zero crossing too big! Detect based on energy level only Sample only chunk from audio device Tune thresholds to be effective Can have on or off Packet Loss Drop before sending, or after receiving (your choice) Percent, uniform randomly distributed
Hints Many different architectural possibilities Can design how you want Provide some sample code ( tools ) Refer to other samples, but write your own code (and reference any others) Consider remote development (not at console) Pre-Record some conversation Read from file or device Write to file or device Allow development of system code Also good for one person testing
Sample Code Linux/Cygwin Basic TCP sockets: talk-tcp.c and listen-tcp.c Basic UDP sockets: talk- udp.c and listen-udp.c Setting a timer: setitimer.c POSIX threads: add2.c Multiple interrupts: select.c Parsing command line parameters: get-opt.c Windows A simple header file to generate error messages for Winsock errors: sockerr.h Basic TCP sockets: tcp- talk.cpp, tcp-listen.cpp Basic UDP sockets: udp- talk.cpp, udp-listen.cpp Get the IP address of a host: getIPaddress.cpp
Hand-In Email a tar/zip file Use your name as the directory Include All source code and Makefile README file with instructions on running Due end of day when due
Grading 60% Basic 2-way VoIP Application (TCP or UDP), with parameters. 15% Uses both UDP and TCP. 5% Supports Speech Detection. 5% Works under all Loss parameters. 5% Works under all Delay parameters. 10% Clear, well-written code, including comments. Should be easy to "read" and understand. Grading rubric available online
