Mode setting of pulseaudio (21)

PulseAudio It's a sound server , A background process from one or more sound sources （ Process or input device ） Accept sound input Then redirect the sound to one or more slots （ Sound card , Remote network PulseAudio service , Or other processes ）.

PulseAudio One purpose of is to redirect all sound streams through it , Including those processes that try to access the hardware （ Like those left over based on OSS Software for ）.PulseAudio By providing adapters to those who use different sound systems , image aRts and ESounD.

stay Linux Typical scheme under , User provided configuration ALSA To use PulseAudio Virtual devices provided . Although the application uses ALSA Will output the output sound to PulseAudio, then PulseAudio Will use ALSA It accesses the real sound card itself . PulseAudio It also provides its own interface to the application , For direct support PulseAudio, Like those left over based on ESD Software for , This makes PulseAudio For a ESD substitute .

PulseAudio The main features include :

Volume control for each application Per-application volume controls

Extensible plug-ins and supporting loadable module architecture

Compatibility with many popular audio applications

Support multiple sound sources and multiple outputs

Low delay operation and support delay measurement

A zero copy memory architecture for processor resource efficiency

Be able to discover the use of... On the local network PulseAudio And play sound directly through its speakers

A sound output device that can change an application , Even if the application is playing sound （ The program does not need to support this feature , As a matter of fact , The program didn't even realize the change ）

Command line interface with script function

A fully functional daemon with command line reconfiguration

Built in sampling conversion and resampling functions

It can combine multiple sound cards into one sound card

Can play multiple audio streams simultaneously

Dynamically detect Bluetooth audio