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Multimedia Communications

• Submission files to mmcom.nctu [at] gmail.com
• Mini-assignment 1: traceroute
• Assignment 1: Audio Streaming (pdf)
• Assignment 2: Video Streaming (pdf)

Mini-assignment: traceroute

traceroute from linux6.cs.nctu.edu.tw (or any host in NCTU campus) to www.csail.mit.edu and answer the following questions.

• Dump the results
• How many hops from the source to the destination?
• What is the hop introducing the maximal average delay
• Why sometimes a later router responds faster than an earlier router? (Why sometimes the response latency is decreasing?

When and where to submit?

• Due: Mar. 3 (Fri.) 11:59pm
• Email to mmcom.nctu@gmail.com
• Email subject: [MMC] yourID_traceroute
• Filename: MMC_yourID_traceroute.pdf

Lab 1: Audio Streaming

Introductrion

In this assignment, you will learn how to use TCP and UDP socket to deliver audio signal and call the Ubuntu library to real-time play the stream. You will also learn how to use Traffic Control to manually configure your network conditions for experiments. Through experiments, you can perceive how audio quality varies with the available bandwidth and the selected underlying transportation protocol. You will also learn how to quantitatively evaluate the quality of the received audio stream. 

Please modify the example code (.cpp files) to finish your tasks. Detailed description and the default parameters are given in the slides (hw1_info.pdf).

Prerequisite

• Learning socket programming online. Below are some tutorial:
• Server and client example with C sockets on Linux
• Linux Howtos: C/C++ -> Sockets Tutorial
• C Socket Programming for Linux: Example Code
• Install Linux (on VM [optional]).
• Make sure you can play and record audio sound on the installed Linux.

Files to submit

• shell scripts for running your code
  • server.sh
  • client.sh
• socket programming codes
  • server_tcp.cpp
  • client_tcp.cpp
  • server_usp.cpp
  • client_udp.cpp
• audio processing code
  • readwav.cpp
• output files
  • ratexx_tcp.wav, ratexx_udp.wav
  • ratexx_tcp.csv
• 1-2 page report (including the required figures and short discussion)
  • report.pdf

Due

• Mar. 31 (Fri.) 11:59pm

File Submission

• Email to mmcom.nctu@gmail.com
• Mail subject: [MMCom] hw1_yourID
• Filename: hw1_yourID.zip

Grading

• Shell script: 10%
• TCP socket: 25%
• UDP socket: 25%
• Audio processing: 25%
• Report: 15%

Lab 2: Video Streaming

Introductrion

In this assignment, you will learn how to dynamically configure the video rates during encoding. You will also need to adjust the sending rate of the UDP stream according to the dynamic video rates. The UDP client should track packets losses, pad null bits for lost packets and estimate the PSNR using FFMpeg.

Please modify the example code (.cpp files) to finish your tasks. Detailed description and the default parameters are given in the slides (hw2_info.pdf).

Files to submit

• makefile and shell scripts for running your code
  • Makefile
  • streaming.sh
  • control.sh
• socket programming codes
  • x264_encode.cpp
  • server.cpp
  • client.cpp
• 1-2 page report (including the required figures and short discussion)
  • report.pdf

Due

• May. 31 (Wed.) 11:59pm

File Submission

• Email to mmcom.nctu@gmail.com
• Mail subject: [MMCom] hw2_yourID
• Filename: hw2_yourID.zip

Grading

• shell script: 10%
• encoder: 25%
• streaming server: 25%
• streaming client: 25%
• report: 15%