PulseAudio
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← Revision 53 as of 2021-06-16 11:56:57 ⇥
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Comment: lubuntu 16.04 is EOL/unsupported; modern lubuntu uses pulseaudio so tweak wording (esp. tense)
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| = PulseAudio = | ||<tablestyle="float:right; font-size: 0.9em; width:40%; background:#F1F1ED; margin: 0 0 1em 1em;" style="padding:0.5em;">'''Contents'''<<BR>><<TableOfContents>>|| |
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| PulseAudio is a sound server for POSIX and Win32 systems. A sound server is basically a proxy for your sound applications. It allows you to do advanced operations on your sound data as it passes between your application and your hardware. Things like transferring the audio to a different machine, changing the sample format or channel count and mixing several sounds into one are easily achieved using a sound server. It's a drop in replacement for EsounD. PulseAudio is the standard sound server in Ubuntu Hardy Heron 8.04. Here's how to install it, as of Dec-08-2007, on Ubuntu Gutsy Gibbon 7.10, with PulseAudio 0.9.6 == Installation == === Installing PulseAudio === Open a Terminal window. Type the following: {{{ sudo apt-get install libasound2-plugins "pulseaudio-*" paman padevchooser paprefs pavucontrol pavumeter }}} This will install the ALSA Pulse plugin, the PulseAudio daemons and the PulseAudio tools. |
[[http://www.pulseaudio.org|PulseAudio]] is a sound server for POSIX and Win32 systems. A sound server is basically a proxy for your sound applications. It allows you to do advanced operations on your sound data as it passes between your application and your hardware. Things like transferring the audio to a different machine, changing the sample format or channel count and mixing several sounds into one are easily achieved using a sound server. |
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| === ALSA Configuration === | = Installation = |
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| Now, type the following: | Pulseaudio is already installed by default on Ubuntu and flavors. = PulseAudio Removal = This is generally a bad idea. = Using PulseAudio = For Ubuntu environments that use pulseaudio, Ubuntu has its own custom sound indicator that will allow you to select the preferred device and control the volume of each application. If you would prefer to try pulseaudio's generic control GUI, install the pavucontrol package and launch it with terminal command: |
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| gksudo gedit /etc/asound.conf }}} This will open /etc/asound.conf in a Text Editor as the root user. Normally on Ubuntu 7.10, this file will not exist, so we're creating it. Paste in the following: {{{ pcm.pulse { type pulse } ctl.pulse { type pulse } pcm.!default { type pulse } ctl.!default { type pulse } |
pavucontrol |
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| The top two will create new output and input definitions for PulseAudio, and the bottom two will set PulseAudio as the default audio device for programs using the ALSA interface. | = Troubleshooting = |
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| Save and exit Text Editor. | == Resetting User Configuration == |
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| === Adding Users to the PulseAudio groups === | For some reason, pulseaudio's user configuration files can become corrupt(unsynced?) in some way, and deleting them (and forcing fresh ones to be generated) fixes a no sound condition. After using the command below, log out/in. |
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| Next we go to System -> Administration -> and click on Users and Groups. | === Ubuntu 12.10/Quantal (and earlier) === {{{ rm -r ~/.pulse*; pulseaudio -k }}} |
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| Click on Manage Groups, and scroll all the way to the bottom of the list where you will find: | === Ubuntu 13.04/Raring (and later) === {{{ rm -r ~/.config/pulse; pulseaudio -k }}} |
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| * pulse * pulse-access * pulse-rt |
== Getting A Verbose Diagnostic Log == |
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| Make sure to highlight each, one at a time, and click Properties. Just put a check next to each user that you want to be able to have access to sound (for example, there's "ted" and "root" and "kamilion" listed, and you only want "kamilion" to have access to sound, that's the one to check, leave the other two blank) | This log can aid bug reports. If possible, attach it to any bug report filed against pulseaudio or even to ALSA bug reports where pulseaudio is involved: https://wiki.ubuntu.com/PulseAudio/Log |
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| == Configuring PulseAudio == | == Using A Lubuntu 16.04 (and older) LiveUSB/CD == |
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| Now, go into Applications -> Sound and Video -> click on PulseAudio Preferences. * Checkmark all three options under Network Access. This will allow other computers on your LAN with PulseAudio to access this computer's sound devices. * Checkmark Enable Multicast/RTP Receiver. This allows receiving multicast streams from other systems on your LAN. * Checkmark Enable Multicast/RTP Sender. This allows sending multicast streams (One source sends packets, all others may receive them simultaneously) |
Because Lubuntu 16.04 does not use pulseaudio, it can be useful in determining whether an audio issue is caused by pulseaudio, the ALSA driver, or another program. If the issue still occurs in a Lubuntu environment, pulseaudio is probably not causing it. Note: Modern Lubuntu does use pulseaudio. |
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| Leave the other options alone for now, unless you want to loop outgoing streams through the local speakers. | == Static, Underruns == |
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| Next go into System -> Preferences -> Sound and make sure that Enable Software Sound Mixing is checked. Also, under the Sounds Tab, I set devices to Autodetect. * Reboot your machine to enable the PulseAudio server. == PulseAudio Removal == If you decide you no longer like PulseAudio and would like to disable it: Remove the added lines to /etc/asound.conf If /etc/asound.conf did not exist when you installed PulseAudio, you may remove /etc/asound.conf entirely. After this, you may remove all of the installed PulseAudio packages. |
https://wiki.ubuntu.com/Audio/PositionReporting |
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| == Firefox/Flash and PulseAudio == Be Default, libflashplugin (Flash 9 support in Firefox) doesn't work properly with PulseAudio. Go to logicalnetworking.net to download the libflashsupport .deb and install it: {{{ wget http://logicalnetworking.net/other/libflashsupport_1.0~2219-1_i386.deb }}} Restart Firefox to enable audio output from flash. - OR - Instead I found the files http://pulseaudio.vdbonline.net/flashplugin-nonfree-pulse_0.1~000.tar.gz and http://pulseaudio.vdbonline.net/flashplugin-nonfree-pulse_0.1~000.dsc. --akaihola '''Note:''' You can download and compile it by doing: {{{ wget http://pulseaudio.vdbonline.net/flashplugin-nonfree-pulse_0.1~000.tar.gz tar xvfz flashplugin-nonfree-pulse_0.1~000.tar.gz cd flashplugin-nonfree-pulse-0.1~000 sudo apt-get install libpulse-dev make sudo make install -- Tom Wright }}} '''Note:''' For Hardy64 users: {{{ http://ubuntuforums.org/showpost.php?p=4350045&postcount=12 }}} |
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| If you have firestarter installed, it *WILL* stop PulseAudio from properly communicating over Zeroconf/Avahi's port 5353. | If you have firestarter firewall installed, it *WILL* stop PulseAudio from properly communicating over Zeroconf/Avahi's port 5353. |
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| = Credits = | == Programs Using OpenSound/OSS output == |
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| Kamilion initially wrote this wikipage on Dec-08-2007 using information found through the following sources: Ghost|BTFH supplied the initial Ubuntu howto for older Ubuntu versions and the libflashplugin fix in his blog, here: http://ghost.thewatch.org/2007/05/pulseaudio-in-ubuntu.html ! ! Note ! - As of 2008-02-10 the URL mentioned above, ghost.thewatch.org/2007/05/pulseaudio-in-ubuntu does not exist. varunus supplied the information on how to make Avahi work with Firestarter here: http://ubuntuforums.org/showthread.php?t=164193 akaihola added the note about broken Flash fix URL on 2008-02-03. jerickson (Logical Networking Solutions) modified the libflashsupport .deb URL to point to a valid location on 2008-03-24. |
You may run into applications that use OSS output (programs looking for /dev/dsp). Ubuntu no longer supports OSS natively, and you should try to switch the program's audio output to something better supported, like ALSA or esound/esd (which pulse emulates very well). If that's not possible, you can run the program using OSS emulation: {{{ padsp <command_to_start_program> }}} |
Contents |
PulseAudio is a sound server for POSIX and Win32 systems. A sound server is basically a proxy for your sound applications. It allows you to do advanced operations on your sound data as it passes between your application and your hardware. Things like transferring the audio to a different machine, changing the sample format or channel count and mixing several sounds into one are easily achieved using a sound server.
Installation
Pulseaudio is already installed by default on Ubuntu and flavors.
PulseAudio Removal
This is generally a bad idea.
Using PulseAudio
For Ubuntu environments that use pulseaudio, Ubuntu has its own custom sound indicator that will allow you to select the preferred device and control the volume of each application. If you would prefer to try pulseaudio's generic control GUI, install the pavucontrol package and launch it with terminal command:
pavucontrol
Troubleshooting
Resetting User Configuration
For some reason, pulseaudio's user configuration files can become corrupt(unsynced?) in some way, and deleting them (and forcing fresh ones to be generated) fixes a no sound condition. After using the command below, log out/in.
Ubuntu 12.10/Quantal (and earlier)
rm -r ~/.pulse*; pulseaudio -k
Ubuntu 13.04/Raring (and later)
rm -r ~/.config/pulse; pulseaudio -k
Getting A Verbose Diagnostic Log
This log can aid bug reports. If possible, attach it to any bug report filed against pulseaudio or even to ALSA bug reports where pulseaudio is involved: https://wiki.ubuntu.com/PulseAudio/Log
Using A Lubuntu 16.04 (and older) LiveUSB/CD
Because Lubuntu 16.04 does not use pulseaudio, it can be useful in determining whether an audio issue is caused by pulseaudio, the ALSA driver, or another program. If the issue still occurs in a Lubuntu environment, pulseaudio is probably not causing it. Note: Modern Lubuntu does use pulseaudio.
Static, Underruns
https://wiki.ubuntu.com/Audio/PositionReporting
Known Issues
Firestarter & Avahi
If you have firestarter firewall installed, it *WILL* stop PulseAudio from properly communicating over Zeroconf/Avahi's port 5353.
How to Fix:
gksudo gedit /etc/firestarter/user-pre
In the file, add the following lines:
$IPT -A INPUT -p udp --dport 5353 -d 224.0.0.251 -j ACCEPT $IPT -A OUTPUT -p udp --dport 5353 -d 224.0.0.251 -j ACCEPT
Then, save and close the file, and then type:
/etc/init.d/avahi-daemon restart
Programs Using OpenSound/OSS output
You may run into applications that use OSS output (programs looking for /dev/dsp). Ubuntu no longer supports OSS natively, and you should try to switch the program's audio output to something better supported, like ALSA or esound/esd (which pulse emulates very well). If that's not possible, you can run the program using OSS emulation:
padsp <command_to_start_program>
PulseAudio (last edited 2021-06-16 11:56:57 by guiverc)