Translation (s) : Russian - English

Hardware - Sound


PulseAudio , previously known as Polypaudio, - sound server for POSIX and WIN32. This is a replacement ESD sound server with much less latency, the best quality mixing and sampling and overall architecture.

Here are some possibilities PulseAudio:

High quality software mixing of multiple audio streams with support more than one entrance and exit. Can be used forcombine multiple sound cards into one (with frequency rate). The set of supported client libraries. Applications that use ESD, ALSA, oss, libao and GStreamer, are supported without the need to any changes to them. Modules for PulseAudio is available for xmms and mplayer. Adding sufficiently small time delay, and a very accurate measurement delay time for recording and playback. Ability to fullysynchronize multiple playback streams. Network transparency: the application can play or record audio on a computer other than the one on which they run. Extensible architecture with modules for jackd, multicast-rtp, lirc and avahi, among others.

Installing PulseAudio

Set the sound server, use the command

Setting for applications using ALSA

To make the application dependent ALSA could use PulseAudio to create the configuration file / etc / asound.conf (system-wide) (recommended) or ~ / asoundrc (for each user).

This will allow the program to specify in the settings of the device for sound output pulse.

If you want to PulseAudio has become the default device for ALSA-applications, use these settings:

If you miss the last two groups, Pulseaudio will not be used by default. To work correctly, you need to change "alsa device" on "pulse" of each program you are using.

Alternative configurations

Surround sound system Many people have a multi-channel sound cards, but use the speakers for the two channels. PulseAudio has no default settings for surround sound support. To enable all channels, edit the file / etc / pulse / daemon.conf: uncomment default-sample-channels (ie remove the semicolon at the beginning of the line) and set it to 6 if you System 5.1 or 8, if your system is 7.1.

# Default default-sample-channels = 2 # To 5.1 default-sample-channels = 6 # To 7.1 default-sample-channels = 8 After making the changes, restart Pulseaudio.

Solving Problems

The lack of playback devices or audio capture

If we update or some time later Pulseaudio stopped correctly determine the input / output devices and sources, try to clear the configuration files pulseaudio. To do this, delete the folder: ~ /. Pulse, ~ /. Pulse-cookie and / tmp/.esd- *. Forcibly end the process pulseaudio command:

# Killall -9 pulseaudio Then run:

$ Pulseaudio - start If that does not work well and remove the / etc / pulse and reinstall PulseAudio.

==Wheezing and audio interruptions== If a low-power machine having wheezing, in / etc / pulse / daemon.conf list the following:

high-priority = no nice-level = -1 realtime-scheduling = yes realtime-priority = 5 flat-volumes = no resample-method = speex-float-1 default-sample-rate = 48000 Interrupting play in Amarok when running Skype Comment out or remove the line in the / etc / pulse / default.pa

load-module module-cork-music-on-phone Excessive CPU usage and distortion Add a line to / etc / pulse / default.pa

load-module module-udev-detect tsched = 0 Sound level is low or low sound Add a line to / etc / pulse / daemon.conf:

flat-volumes = no Various problems with Skype and Wine Add or uncomment the line in / etc / pulse / daemon.conf

default-fragments = 25 default-fragment-size-msec = 25 References Tweaking PulseAudio (in English) . CategorySound CategorySound

  1. PulseAudio

  2. Installation
    1. Alternative Configurations
      1. As The Only Sound System
    2. Troubleshooting
      1. Missing Sound Device (Recording or Reproduction)
      2. Noise Or Glitches
      3. Glitches In Sound Reproduction With Amarok Or Skype
      4. Unreasonable CPU Usage And Distortion
      5. Poor Sound Level Or No Sound
      6. Various Problems With Skype
      7. Reference