Phonon

Хоча здебільшого розробку Phonon спрямовано на розробників програмного забезпечення, а архітектуру системи побудовано так, щоб полегшити розробку, Phonon надає у розпорядження кінцевого користувача декілька цікавих можливостей.

Можливості

• 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.
• 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.

Усування проблем

Немає звуку

Причин повної неможливості чути звук може бути декілька.

Некоректний початковий порядок пристроїв

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 Getting Involved for information on how you can help fix this.

У списку немає потрібних записів пристроїв

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 Getting Involved on how to help fix this.

Не вдається отримати доступ до звукового пристрою

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).

Звук відтворюється не на тому пристрої

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.

Phonon спричиняє аварійне завершення програм або всього середовища

Будь ласка, спробуйте знайти повідомлення про подібну помилку на bugs.kde.org. Якщо подібного повідомлення знайти не вдасться, повідомте про нову ваду. Якщо ж повідомлення вже створено, але у вас є нові дані, будь ласка, додайте їх до вже створеного повідомлення про ваду.

У списку немає пристроїв з ~/.asoundrc або /etc/asound.conf

Переконайтеся, що встановлено підказку щодо назви вашого пристрою. Приклад повного запису пристрою з підказкою:

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"
    }
    }

Допоміжні бібліотеки

Phonon itself is just a thin shim, and makes use of backend libraries to provide the actual functionality.

• Phonon-Xine: This is the first proper backend for Phonon, and is currently the most mature and recommended backend to use.
• 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-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-DS9: This is a 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 is a third-party backend for Phonon, utilizing the popular mplayer application for playback.
• Phonon-NMM: This is an abandoned and unmaintained backend started by the Graphics Lab at Saarland University and Motama.

Як взяти участь у розробці

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

• Reporting audio hardware: Download the soundcard.sh script and run it, and attach the output to bugs.kde.org. This enables us to add your hardware information to our audio device database.
• 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!
• 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!