Difference between revisions of "Phonon"

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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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'''Phonon''' is a multimedia, multi-platform sound framework for the application developer. '''Phonon''' also provides several features and benefits for the end user.
  
 
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* ''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.
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* ''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 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.
+
* ''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:'' The use of pluggable audio and video devices like USB or Bluetooth headsets is almost ubiquitous today. '''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.
+
* ''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.
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==Configuration== <!--T:27-->
 +
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]].
  
 
==Troubleshooting== <!--T:6-->
 
==Troubleshooting== <!--T:6-->
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There are many possible reasons for no sound at all.
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Possible causes for no sound.
  
 
====Incorrect default ordering of devices==== <!--T:9-->
 
====Incorrect default ordering of devices==== <!--T:9-->
  
 
<!--T:10-->
 
<!--T:10-->
'''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.
+
'''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-->
 
====Missing device entries==== <!--T:11-->
  
 
<!--T:12-->
 
<!--T:12-->
This can be caused by [[Special:myLanguage/Solid|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.
+
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-->
 
====Unable to access audio device==== <!--T:13-->
  
 
<!--T:14-->
 
<!--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 (make sure that your user account is a part of the ''audio'' user account group).
+
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-->
 
===Sound out of the wrong device=== <!--T:15-->
  
 
<!--T:16-->
 
<!--T:16-->
This is related to the point above this. Also make sure that the correct device is listed at the top in the <menuchoice>Sound and Video</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.
+
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-->
 
===Phonon causes a crash=== <!--T:17-->
  
 
<!--T:18-->
 
<!--T:18-->
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.
+
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-->
 
===Devices from ~/.asoundrc or /etc/asound.conf are not listed=== <!--T:19-->
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<!--T:20-->
 
<!--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:
{{Output|1=<nowiki>pcm.softvolPhonon {
+
{{Output|1=pcm.softvolPhonon {
    type softvol
+
    type softvol
    slave.pcm "default:CARD=0"
+
    slave.pcm "default:CARD=0"
    control {
+
    control {
 
         name "Phonon"
 
         name "Phonon"
 
         card 0
 
         card 0
    }
+
    }
    min_dB -51.0
+
    min_dB -51.0
    max_dB 0.0
+
    max_dB 0.0
    resolution 100
+
    resolution 100
    hint {
+
    hint {
 
         show on
 
         show on
 
         description "My Soundcard with extra Volume Control"
 
         description "My Soundcard with extra Volume Control"
    }</nowiki>
+
    }
 +
}
 
}}
 
}}
 +
 +
===Systemsettings crashes when selecting Phonon=== <!--T:26-->
 +
This is likely because you have xine as a backend. Please remove the file <tt>~/.xine/catalog.cache</tt> and try again.
  
 
==Backend libraries== <!--T:21-->
 
==Backend libraries== <!--T:21-->
  
 
<!--T:22-->
 
<!--T:22-->
'''Phonon''' itself is just a thin shim, and makes use of ''backend libraries'' to provide the actual functionality.
+
'''Phonon''' makes use of ''backend libraries'' to provide sound.
* '''Phonon-Xine:''' This is the first proper backend for ''Phonon'', and is currently the most mature and recommended backend to use.
+
* '''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, 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.
+
* '''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-GStreamer:''' '''GStreamer''' is a multimedia library from the GNOME project. This backend is not recommended due to a lack of volunteers for maintaining it.
+
* '''Phonon-Xine:''' Formerly the most popular backend for ''Phonon''; now unmaintained, and deprecated.
* '''Phonon-DS9:''' This is a native backend for Microsoft Windows utilizing '''DirectShow 9'''.
+
* '''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-QT7:''' This is a native backend for Mac OS X, utilizing '''QuickTime 7'''.
* '''Phonon-MPlayer:''' This is a third-party backend for '''Phonon''', utilizing the popular '''mplayer''' application for playback.
+
* '''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.
 
* '''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-->
 
==Getting Involved== <!--T:23-->
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<!--T:24-->
 
<!--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.
 +
* ''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.
 
* ''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!
 
* ''Documentation:'' You can help expand this page and other '''Phonon''' documentation. It doesn't take much to help, and it helps!
* ''Promotion:'' Spreading the word about KDE and '''Phonon''' is always welcome.
 
* ''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>
 
</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 edited on 20 December 2013, at 16:10. Content is available under Creative Commons License SA 4.0 unless otherwise noted.