Multimedia Systems - Assignment - Packet Loss - Source code
Source code of the assignment completed as part of the COMPGZ05 - Multimedia Systems module (MSc Web Science and Big Data Analytics) at University College London.
Repository contents
- Source code in C
- output folder storing output files after running the code
- Report in PDF format
Assignment brief
The aim of this assignment was to experiment with:
- repairing packet loss with packet audio
- applying DCT (Discrete Cosine Transform)
- get a feel for the effect of discontinuities on how audio sounds
We were supplied with a simple packet loss simulator. It reads in a .wav file, splits it into packets, and simulates sending the packets over a lossy link. It then receives the packets that didn’t get lost and reconstructs a .wav file from them.
The assignment consisted of two tasks:
- Implement a repair strategy: interpolation
- Apply smoothing in order to fix clicks in the audio
Task 1
The example screenshot below shows the difference in audio waveform before and after interpolation was applied. Interpolation involves reconstructing the first packet in such a way that it sounds more like the packet from before the loss gap while reconstructing the last packet in a way that it sounds more like the packet from after the gap.
Task 2
The example screenshot below shows the difference in audio waveform before and after smoothing was applied. I chose to smooth out the audio by "pulling" the two ends of a packet together.
Instructions
To run the source code, follow the steps below:
# navigate to multimedia-systems-coursework folder
cd multimedia-systems-coursework
# compile the source code
make
# run compiled program loss_sim and specify parameters
loss_sim --param