A talk about the GNOME audio stack, presented at the GNOME Asia Summit 2015

1. The GNOME Audio Story
Arun Raghavan

2. Who am I?

3. twitter: @louiswu
irc: Ford_Prefect

4. PulseAudio
GStreamer
Other misc.

5. How hard can audio be?

6. 🔉 Read samples, play them out
🎤 Record samples, do stuff

7. Samples?

10. Start from the lowest layer

11. ALSA

12. Advanced Linux Sound Architecture

13. Kernel infrastructure
Userspace library
Plugin system

14. “Restricted” subset
Talk to the hardware

15. PulseAudio

16. Sound server
Why do we need one?

17. Applications just wanna
play or capture

19. Mixing
Conversion
Volumes

20. Routing
Filters

21. Power
Hardware

22. Simple API
Async API

23. libcanberra

24. Event sound library

25. Phone ring
Button press
New message

26. GTK+ bindings
Easily attach an event to a widget

27. Sounds cached if possible

28. GStreamer

29. Swiss-army mulitimedia knife

30. Encode/decode
Containers

31. Audio and video
Disk, network, …

32. Everything that Nirbheek
spoke about yesterday

33. BUT WHAT DO I USE?

34. ALSA

35. Practically never

36. PulseAudio

37. Working with samples
Fine-grained control

38. libcanberra

39. Event sounds
GSound in the future
'nuff said

40. GStreamer

41. Encoded audio
Custom pipeline

42. JACK

43. What's that?
Pro-audio use cases

44. Future work

45. Container support
Filters and effects

46. UI interactions
Low latency

47. Easier policy
Compressed audio

48. Questions?

49. Thank you!
♥