Gülçin Yıldırım Jelínek
Staff Database Engineer @Xata, Main Organizer @Prague PostgreSQL Meetup, MSc, Computer and Systems Engineering @ Tallinn University of Technology, BSc, Applied Mathematics @Yildiz Technical University
SoC Design
Audio Mixer Project
Team Lead: Karl
Pioneering Team: Hardi + Gulcin + Keijo
Building Blocks of Audio Mixer
Audio IP (in)
Audio to AXI
Audio mixer
Audio IP (out)
Headphones
AXI to
audio
Audio Copy Driver
Linux
Line in
IRQ
Copy audio from input to output
IRQ
AXI
AXI
Audio Copy
Audio IP (out)
AXI to
audio
Main Loop
UDP B_CAST
Ethernet
Main Loop
FIFO
Thread
Audio IP
Left + Right
Parallel
UDP Broadcast
FIFO
UDP Receiver Driver (1)
Audio IP (in)
Audio to AXI
Audio mixer
Audio IP (out)
Headphones
AXI to
audio
Audio Receive Driver
Linux
Receive audio and send it to the output
AXI
Network Stream (UDP)
UDP Receiver Driver (2)
Audio IP (in)
Audio to AXI
Audio mixer
Audio IP (out)
Headphones
AXI to
audio
Audio Driver
Thread 1
Thread 2
Network Stream
Linux
Line in
AXI to
audio
AXI
AXI
AXI
IRQ
IRQ
Simple Audio Mixer
Headphones
AXI to
audio
Audio Driver
Thread 1
Thread 2
Network Stream
Linux
Line in
AXI
AXI
AXI
IRQ
IRQ
AXI to
audio
Audio mixer
Audio IP (out)
Volume control
Audio to AXI
Audio IP (in)
Filter 2
Volume control
Filter 1
Audio Mixer
Audio IP (in)
Audio to AXI
Audio mixer
AXI to
audio
Audio Driver
Thread 1
Thread 2
Network Stream
Linux
Line in
Audio to AXI
AXI to
audio
Audio Mixer
Audio IP (out)
Filter 1
Filter 2
Headphones
Audio to AXI
VolumeControl
AXI to
audio
Audio to AXI
Audio IP (in)
Thread 1
Thread 2
AXI
AXI
AXI
AXI
AXI
IRQ
IRQ
IRQ
Shared Volume Control
How we started?
- Created project wiki: http://ati.ttu.ee/socdesign/index.php/Project_Description
- Used Github for our version controlling and source code:
https://github.com/karljans/SoC_Design - Set up extra network in the class that's is streaming audio
4 Important questions
- What was the initial project task?
- Did we first model our task?
- What went wrong during the project?
- How to mitigate these problems?
Did we first model our task?
Ehh.... No
What went wrong during the project?
- ZedBoard processing resources were overflowed
- Bad quality with delays
How to mitigate these problems?
- Using DMA (Direct memory access)
- Threads use resource locking
Conclusions
- Use either DMA or resource locking approach
- Model the whole system ( time )
- Reduce sampling rate on sender part
Thank you!
SoC Design Audio Mixer Project - Workshop
By Gülçin Yıldırım Jelínek
SoC Design Audio Mixer Project - Workshop
This presentation is created for System-on-Chip Design course of Tallinn University of Technology.
