Sound

This document describes how audio is implemented in NightOS.

Audio inputs

Devices recognized as audio inputs can act as global audio input devices. Multiple devices can be used at the same time, but only one default input can be selected.

By default, each time a new audio input device is connected, it is selected as the new default device. When disconnected, the previous default device is selected again.

It is also possible to set a device as always being the default one, even if other devices are connected afterwards.

Playback devices

Devices recognized as audio outputs can act as global audio output devices. Multiple devices can be used at the same time, but only one default output can be selected.

By default, each time a new audio input device is connected, it is selected as the new default device. When disconnected, the previous default device is selected again.

It is also possible to set a device as always being the default one, even if other devices are connected afterwards.

Multimedia playback

When a sound is played, the process must specify the type of the audio resource, which is either "standalone sound" or "multimedia sound". In the second case, a multimedia notification is emitted, which can then be controlled by the application but cannot be closed while the media is playing.