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MediaSource Class Reference
(Phonon::MediaSource)
[Phonon module]

The MediaSource class provides multimedia data for media objects. More...

 #include <Phonon>

This class was introduced in Qt 4.4.

Public Types

Public Functions


Detailed Description

Author: Matthias Kretz <kretz@kde.org>

The MediaSource class provides multimedia data for media objects.

The MediaSource class manages a source of multimedia content, such as a music or video file, of which data is given to a MediaObject.

The media source knows how fetch its data from several sources, e.g., from files, a QIODevice, or a CD. The possible source types are described by the Type enum. Note that it is possible to provide data from any source by implementing an AbstractMediaStream.

The class has several functions to acquire information about the source it manages, e.g., fileName(), url(), and diskType(). The return from these functions are dependent on the type() of the media source.

Normally, a programmer does not need to be concerned with media sources. It's constructors are implicit, so one can, for instance, send an URL or filename directly to the constructors of the MediaObject.

     MediaObject m;
     QString fileName("/home/foo/bar.ogg");
     QUrl url("http://www.example.com/stream.mp3");
     QBuffer *someBuffer;
     m.setCurrentSource(fileName);
     m.setCurrentSource(url);
     m.setCurrentSource(someBuffer);
     m.setCurrentSource(Phonon::Cd);

Qt Backends

Currently, Qt's backends support files in local and remote locations. Support for other sources, such as CD/DVD, are planned for the future.

See also MediaObject.


Member Type Documentation

enum MediaSource::Type

Identifies the type of media described by the MediaSource object.

ConstantValueDescription
Phonon::MediaSource::Invalid-1The MediaSource object does not describe any valid source.
Phonon::MediaSource::LocalFile0The MediaSource object describes a local file.
Phonon::MediaSource::Url1The MediaSource object describes a URL, which can be either a local file or a file on the network.
Phonon::MediaSource::Disc2The MediaSource object describes a disc.
Phonon::MediaSource::Stream3The MediaSource object describes a data stream. This is also the type used for QIODevices.

See also MediaSource::type().


Member Function Documentation

MediaSource::MediaSource ( const QString & fileName )

Creates a MediaSource object for file specified by fileName.

MediaSource::MediaSource ( const QUrl & url )

Creates a MediaSource object for a the URL specified by url.

If the multimedia content you would like to play back is on a remote network location, you should use this constructor; though, it also possible to specify an URL to a local file.

See also QUrl.

MediaSource::MediaSource ( Phonon::DiscType discType, const QString & deviceName = QString() )

Creates a MediaSource object for the type of disc specified by discType in the named device referred to by deviceName.

Note: deviceName is a platform dependent device name. It can be useful to specify this if the computer has more than one CD drive. On KDE, it is recommended to use the Solid hardware discovery framework to retrieve the device name in a portable way.

MediaSource::MediaSource ( QIODevice * ioDevice )

Creates a MediaSource object for the QIODevice specified by ioDevice.

This constructor can be very handy in the combination of QByteArray and QBuffer.

ioDevice is an arbitrary readable QIODevice subclass. If the device is not opened MediaSource will open it as QIODevice::ReadOnly.

Note: Sequential devices can also be used, but MediaObject::isSeekable() will return false as a result.

See also setAutoDelete().

MediaSource::MediaSource ( const MediaSource & other )

Constructs a copy of the other media source.

This constructor is fast thanks to explicit sharing.

MediaSource::~MediaSource ()

Destroys the MediaSource object.

bool MediaSource::autoDelete () const

Returns the setting of the auto-delete option. The default is false.

See also setAutoDelete().

QString MediaSource::deviceName () const

Returns the device name of the MediaSource if type() == Disc; otherwise returns QString().

Phonon::DiscType MediaSource::discType () const

Returns the disc type of the MediaSource if type() == Disc; otherwise returns NoDisc.

QString MediaSource::fileName () const

Returns the file name of the MediaSource if type() == LocalFile; otherwise returns QString().

void MediaSource::setAutoDelete ( bool enable )

If enable is true, tells the media source to take ownership of the stream or device that was passed in the constructor; if enable is false, the media source will not delete the stream or device when it is deleted itself.

By default, this setting is false, for safety. If you enable it, you should only access the stream or device as long as you keep a media source object around. As long as you keep the media source wrapping the stream or device, the object will not get deleted.

See also autoDelete().

AbstractMediaStream * MediaSource::stream () const

Returns the media stream of the MediaSource if type() == Stream; otherwise returns 0. QIODevices are handled as streams, too.

Type MediaSource::type () const

Returns the type of the MediaSource (depends on the constructor that was used).

See also Type.

QUrl MediaSource::url () const

Returns the URL of the MediaSource if type() == URL or type() == LocalFile; otherwise returns QUrl().

MediaSource & MediaSource::operator= ( const MediaSource & other )

Assigns the other media source to this media source and returns a reference to it.

This operation is fast thanks to explicit sharing.

bool MediaSource::operator== ( const MediaSource & other ) const

Returns true if this media source is equal to the other media source; otherwise returns false.


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Qt 4.4.0-rc1