Difference between revisions of "Phonon"

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{{Template:I18n/Language Navigation Bar|Phonon}}
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<languages />
 
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<translate>
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<!--T:1-->
 
[[File:Phonon-logo.png]]
 
[[File:Phonon-logo.png]]
  
While Phonon is mostly developed with software developers in mind, and the design is centered around ease of development, Phonon also provides several features and benefits for the end user.
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<!--T:2-->
 +
'''Phonon''' is a multimedia, multi-platform sound framework for the application developer. '''Phonon''' also provides several features and benefits for the end user.
  
 +
<!--T:3-->
 
__TOC__
 
__TOC__
  
==Features==
+
==Features== <!--T:4-->
:* '''Centralized configuration of audio and video:''' Configuration of hardware and media frameworks are offered in a single, centralized dialogue, so that applications don't have to reimplement specialized configuration dialogs.
+
:* '''Purpose driven design:''' Instead of demanding that you select special audio outputs for special applications, Phonon applications describe what kind of sound output they make (Notifications, Music, Video, Communication), and lets you select outputs for these categories individually.
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:* '''Automated device selection:''' The use of pluggable audio and video devices like USB or Bluetooth headsets is almost ubiquitous today. Phonon acts on information and signals from [[Solid]], which is KDE's hardware subsystem, and automatically makes use of new devices.
+
  
==Troubleshooting==
+
<!--T:5-->
===No sound===
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* ''Centralized configuration of audio and video:'' Configuration of hardware and media frameworks are offered in a single, centralized dialog.
There are many possible reasons for no sound at all.
+
* ''Purpose driven design:'' Instead of demanding that you select special audio outputs for applications, '''Phonon''' applications describe what kind of sound output they make and lets you select for these categories individually.
====Incorrect default ordering of devices====
+
* ''Automated device selection:'' Pluggable audio and video devices like USB or Bluetooth headsets become easy to use with '''Phonon'''. '''Phonon''' acts on information and signals from [[Special:myLanguage/Glossary#Solid|Solid]], which is KDE's hardware subsystem, and automatically makes use of new devices.
Phonon automatically tries to order available audio devices using information available and a database with device information shipped with it. Unfortunately this doesn't always works, but look under [[Phonon#Getting_Involved|Getting Involved]] for information on how you can help fix this.
+
 
====Missing device entries====
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==Configuration== <!--T:27-->
This can be caused by [[Solid]] or other system libraries reporting the same name for several devices, which makes Phonon unable to properly display these devices to you. Please see [[Phonon#Getting_Involved|Getting Involved]] on how to help fix this.
+
Phonon can be configured through the Phonon Configuration Module available in System Settings under Multimedia. For a guide of the available options, look at the [[Special:myLanguage/Phonon/Handbook|Phonon handbook]].
====Unable to access audio device====
+
 
If your user account has insufficient permissions to access the audio device, Phonon will be unable to play sound. Please consult the documentation of your distribution on how to ensure that your user account is properly set up (make sure that your user account is a part of the ''audio'' user account group).
+
==Troubleshooting== <!--T:6-->
===Sound out of the wrong device===
+
 
This is related to the point above this. Also make sure that the correct device is listed at the top in the "Sound and Video" area of System Settings. In case an audio device isn't available (an USB-headset unplugged, for example), Phonon will attempt the next device in the list.
+
===No sound=== <!--T:7-->
===Phonon causes a crash===
+
 
Please search on [[http://bugs.kde.org/]] to see if the bug is already reported. If it isn't, please report it, and if it already exists but you have new information not already reported, please add your new information to the existing report.
+
<!--T:8-->
===Devices from ~/.asoundrc or /etc/asound.conf are not listed===
+
Possible causes for no sound.
 +
 
 +
====Incorrect default ordering of devices==== <!--T:9-->
 +
 
 +
<!--T:10-->
 +
'''Phonon''' automatically chooses available audio devices for the best sound. Unfortunately this doesn't always work. Look at [[Special:myLanguage/Phonon#Getting_Involved|Getting Involved]] for information on how you can help fix this.
 +
 
 +
====Missing device entries==== <!--T:11-->
 +
 
 +
<!--T:12-->
 +
Perhaps [[Special:myLanguage/Glossary#Solid|Solid]] or other system libraries are reporting the same name for several devices, which makes '''Phonon''' unable to properly display these devices. Please see [[Special:myLanguage/Phonon#Getting_Involved|Getting Involved]] on how to help fix this.
 +
 
 +
====Unable to access audio device==== <!--T:13-->
 +
 
 +
<!--T:14-->
 +
If your user account has insufficient permissions to access the audio device, '''Phonon''' will be unable to play sound. Please consult the documentation of your distribution on how to ensure that your user account is properly set up. If Pulseaudio is not used, make sure that your user account is a part of the ''audio'' user account group.
 +
 
 +
===Sound out of the wrong device=== <!--T:15-->
 +
 
 +
<!--T:16-->
 +
This is related to the point above this. Also make sure that the correct device is listed at the top of the '''Device Preference''' tab, which can be found in the <menuchoice>Hardware -> Multimedia -> Phonon -> Sound and Video Configuration </menuchoice> area of '''System Settings'''. In case an audio device isn't available (an USB-headset unplugged, for example), '''Phonon''' will attempt the next device in the list.
 +
 
 +
===Phonon causes a crash=== <!--T:17-->
 +
 
 +
<!--T:18-->
 +
Please search on [https://bugs.kde.org/ bugs.kde.org] to see if the bug is already reported. If it is not, please report your bug in detail. If the report already exists but you have new information, please add your new information to the existing report.
 +
 
 +
===Devices from ~/.asoundrc or /etc/asound.conf are not listed=== <!--T:19-->
 +
 
 +
<!--T:20-->
 
Make sure you have a ''name hint'' set for your device. An example of a complete device entry, with a hint:
 
Make sure you have a ''name hint'' set for your device. An example of a complete device entry, with a hint:
<pre>pcm.softvolPhonon {
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{{Output|1=pcm.softvolPhonon {
    type softvol
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    type softvol
    slave.pcm "default:CARD=0"
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    slave.pcm "default:CARD=0"
    control {
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    control {
 
         name "Phonon"
 
         name "Phonon"
 
         card 0
 
         card 0
    }
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    }
    min_dB -51.0
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    min_dB -51.0
    max_dB 0.0
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    max_dB 0.0
    resolution 100
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    resolution 100
    hint {
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    hint {
 
         show on
 
         show on
 
         description "My Soundcard with extra Volume Control"
 
         description "My Soundcard with extra Volume Control"
    }
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    }
}</pre>
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}
 +
}}
  
==Backend libraries==
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===Systemsettings crashes when selecting Phonon=== <!--T:26-->
Phonon itself is just a thin shim, and makes use of ''backend libraries'' to provide the actual functionality.
+
This is likely because you have xine as a backend. Please remove the file <tt>~/.xine/catalog.cache</tt> and try again.
:* '''Phonon-Xine:''' This is the first proper backend for Phonon, and is currently the most mature and recommended backend to use.
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:* '''Phonon-VLC:''' VLC is a very popular cross-platform media player, and it is written using a multimedia library named ''libvlc'', which we also use to power a backend for Phonon. This is also under active development, and is receiving a lot of work from both VLC and Phonon developers.
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:* '''Phonon-GStreamer:''' GStreamer is a multimedia library from the GNOME project. This backend is not recommended due to a lack of volunteers for maintaining it.
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:* '''Phonon-DS9:''' This is a native backend for Microsoft Windows utilizing DirectShow 9.
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:* '''Phonon-QT7:''' This is a native backend for Mac OS X, utilizing QuickTime 7.
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:* '''Phonon-MPlayer:''' This is a third-party backend for Phonon, utilizing the popular ''mplayer'' application for playback.
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:* '''Phonon-NMM:''' This is an abandoned and unmaintained backend started by the Graphics Lab at Saarland University and Motama.
+
  
==Getting Involved==
+
==Backend libraries== <!--T:21-->
 +
 
 +
<!--T:22-->
 +
'''Phonon''' makes use of ''backend libraries'' to provide sound.
 +
* '''Phonon-GStreamer:''' '''GStreamer''' is a multimedia library from the GNOME project. '''Phonon-GStreamer''' is currently the recommended Kubuntu backend, and under heavy development.
 +
* '''Phonon-VLC:''' '''VLC''' is a very popular cross-platform media player. This is also under active development, and is receiving a lot of work from both '''VLC''' and '''Phonon''' developers.
 +
* '''Phonon-Xine:''' Formerly the most popular backend for ''Phonon''; now unmaintained, and deprecated.
 +
* '''Phonon-DS9:''' Native backend for Microsoft Windows utilizing '''DirectShow 9'''.
 +
* '''Phonon-QT7:''' This is a native backend for Mac OS X, utilizing '''QuickTime 7'''.
 +
* '''Phonon-MPlayer:''' This was a third-party backend for '''Phonon''', now unmaintained.
 +
* '''Phonon-NMM:''' This is an abandoned and unmaintained backend started by the Graphics Lab at Saarland University and Motama.
 +
 
 +
</translate><span id="Getting Involved"></span><translate>
 +
 
 +
==Getting Involved== <!--T:23-->
 +
 
 +
<!--T:24-->
 
There are several ways you can get involved as a user.
 
There are several ways you can get involved as a user.
:* '''Reporting audio hardware:''' Download the [[http://websvn.kde.org/*checkout*/trunk/KDE/kdebase/runtime/phonon/libkaudiodevicelist/soundcardinfo.sh|soundcard.sh]] script and run it, and attach the output to [[http://bugs.kde.org/]]. This enables us to add your hardware information to our audio device database.
+
* ''Promotion:'' KDE and '''Phonon''' are awesome! Spread the word.
:* '''Quality assurance:''' Simply run and use Phonon, and report bugs and irregularities to the developers.
+
* ''Appreciation:'' Encouraging words can help lift the spirits of weary multimedia developers way beyond the clouds, when faced with nasty bugs and other challenges. Positive emails, messages on IRC, beer, pizza, gadgets and other developer fuel is very welcome!
:* '''Documentation:''' You can help expand this page and other Phonon documentation. It doesn't take much help, and it helps!
+
* ''Quality assurance:'' Simply run and use '''Phonon''', and report bugs and irregularities to the developers.
:* '''Promotion:''' Spreading the word about KDE and Phonon is always welcome.
+
* ''Documentation:'' You can help expand this page and other '''Phonon''' documentation. It doesn't take much to help, and it helps!
:* '''Appreciation:''' Encouraging words can help lift the spirits of weary multimedia developers way beyond the clouds, when faced with nasty bugs and other challenges. Positive emails, messages on IRC, beer, pizza, gadgets and other developer fuel is very welcome!
+
 
 +
 
 +
<!--T:25-->
 +
[[Category:Multimedia]]
 +
[[Category:Advanced Users]]
 +
</translate>

Latest revision as of 16:10, 20 December 2013

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Phonon-logo.png

Phonon is a multimedia, multi-platform sound framework for the application developer. Phonon also provides several features and benefits for the end user.

Features

  • Centralized configuration of audio and video: Configuration of hardware and media frameworks are offered in a single, centralized dialog.
  • Purpose driven design: Instead of demanding that you select special audio outputs for applications, Phonon applications describe what kind of sound output they make and lets you select for these categories individually.
  • Automated device selection: Pluggable audio and video devices like USB or Bluetooth headsets become easy to use with Phonon. Phonon acts on information and signals from Solid, which is KDE's hardware subsystem, and automatically makes use of new devices.

Configuration

Phonon can be configured through the Phonon Configuration Module available in System Settings under Multimedia. For a guide of the available options, look at the Phonon handbook.

Troubleshooting

No sound

Possible causes for no sound.

Incorrect default ordering of devices

Phonon automatically chooses available audio devices for the best sound. Unfortunately this doesn't always work. Look at Getting Involved for information on how you can help fix this.

Missing device entries

Perhaps Solid or other system libraries are reporting the same name for several devices, which makes Phonon unable to properly display these devices. Please see Getting Involved on how to help fix this.

Unable to access audio device

If your user account has insufficient permissions to access the audio device, Phonon will be unable to play sound. Please consult the documentation of your distribution on how to ensure that your user account is properly set up. If Pulseaudio is not used, make sure that your user account is a part of the audio user account group.

Sound out of the wrong device

This is related to the point above this. Also make sure that the correct device is listed at the top of the Device Preference tab, which can be found in the Hardware -> Multimedia -> Phonon -> Sound and Video Configuration area of System Settings. In case an audio device isn't available (an USB-headset unplugged, for example), Phonon will attempt the next device in the list.

Phonon causes a crash

Please search on bugs.kde.org to see if the bug is already reported. If it is not, please report your bug in detail. If the report already exists but you have new information, please add your new information to the existing report.

Devices from ~/.asoundrc or /etc/asound.conf are not listed

Make sure you have a name hint set for your device. An example of a complete device entry, with a hint:

pcm.softvolPhonon {
     type softvol
     slave.pcm "default:CARD=0"
     control {
        name "Phonon"
        card 0
     }
     min_dB -51.0
     max_dB 0.0
     resolution 100
     hint {
        show on
        description "My Soundcard with extra Volume Control"
     }
}

Systemsettings crashes when selecting Phonon

This is likely because you have xine as a backend. Please remove the file ~/.xine/catalog.cache and try again.

Backend libraries

Phonon makes use of backend libraries to provide sound.

  • Phonon-GStreamer: GStreamer is a multimedia library from the GNOME project. Phonon-GStreamer is currently the recommended Kubuntu backend, and under heavy development.
  • Phonon-VLC: VLC is a very popular cross-platform media player. This is also under active development, and is receiving a lot of work from both VLC and Phonon developers.
  • Phonon-Xine: Formerly the most popular backend for Phonon; now unmaintained, and deprecated.
  • Phonon-DS9: Native backend for Microsoft Windows utilizing DirectShow 9.
  • Phonon-QT7: This is a native backend for Mac OS X, utilizing QuickTime 7.
  • Phonon-MPlayer: This was a third-party backend for Phonon, now unmaintained.
  • Phonon-NMM: This is an abandoned and unmaintained backend started by the Graphics Lab at Saarland University and Motama.

Getting Involved

There are several ways you can get involved as a user.

  • Promotion: KDE and Phonon are awesome! Spread the word.
  • Appreciation: Encouraging words can help lift the spirits of weary multimedia developers way beyond the clouds, when faced with nasty bugs and other challenges. Positive emails, messages on IRC, beer, pizza, gadgets and other developer fuel is very welcome!
  • Quality assurance: Simply run and use Phonon, and report bugs and irregularities to the developers.
  • Documentation: You can help expand this page and other Phonon documentation. It doesn't take much to help, and it helps!

This page was last modified on 20 December 2013, at 16:10. Content is available under Creative Commons License SA 4.0 unless otherwise noted.