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

The VideoPlayer widget is used to perform playback of video. More...

 #include <Phonon>

Inherits QWidget.

This class was introduced in Qt 4.4.

Public Functions

Public Slots

Signals

Additional Inherited Members


Detailed Description

The VideoPlayer widget is used to perform playback of video.

With VideoPlayer you can get results quickly and easily. You can do the standard playback tasks like play(), pause(), and stop(), but also set a playback volume and seek - if the media and backend supports seeking.

VideoPlayer is provided for convenience and removes the need to create a media graph with a MediaObject, AudioOutput, and VideoWidget. If you need functionality not supported by the player, you can build this graph yourself.

Keep in mind that when the VideoPlayer instance is deleted the playback will stop.

A play and forget code example:

 VideoPlayer *player = new VideoPlayer(Phonon::VideoCategory, parentWidget);
 connect(player, SIGNAL(finished()), player, SLOT(deleteLater()));
 player->play(url);

Author: Matthias Kretz <kretz@kde.org>


Member Function Documentation

VideoPlayer::VideoPlayer ( Phonon::Category category, QWidget * parent = 0 )

Constructs a new VideoPlayer instance with the specified parent.

category is the category used for the audio output device.

VideoPlayer::~VideoPlayer ()

On destruction the playback is stopped, also the audio output is removed so that the desktop mixer will not show the application anymore. If you need a persistent audio output don't use VideoPlayer but MediaObject, VideoPath and VideoOutput.

AudioOutput * VideoPlayer::audioOutput () const

Returns the audio output object being used by the player.

qint64 VideoPlayer::currentTime () const

Get the current time (in milliseconds) of the file currently being played.

void VideoPlayer::finished ()   [signal]

This signal is emitted when the playback finished.

bool VideoPlayer::isPaused () const

Returns true if it is currently paused; otherwise returns false if it is currently playing or stopped

bool VideoPlayer::isPlaying () const

Returns true if it is currently playing; otherwise returns false if it is currently stopped or paused

void VideoPlayer::load ( const Phonon::MediaSource & source )   [slot]

Starts pre-loading the media data from the specified source and filling audio buffers in the backend.

When there's already a media playing (or paused) it will be stopped (the finished signal will not be emitted).

MediaObject * VideoPlayer::mediaObject () const

Returns the media object being used by the player.

You can manipulate the object, for instance, use it for a SeekSlider.

See also Phonon::SeekSlider and Phonon::MediaObject.

void VideoPlayer::pause ()   [slot]

Pauses the playback.

void VideoPlayer::play ( const Phonon::MediaSource & source )   [slot]

Plays the media from the given source. Starts playback as fast as possible. This can take a considerable time depending on the URL and the backend.

If you need low latency between calling play() and the sound actually starting to play on your output device you need to use MediaObject and be able to set the URL before calling play(). Note that

 audioPlayer->load(url);
 audioPlayer->play();

doesn't make a difference: the application should be idle between the load and play calls so that the backend can start preloading the media and fill audio buffers.

void VideoPlayer::play ()   [slot]

This is an overloaded member function, provided for convenience.

Continues playback of paused media. Restarts playback of a stopped media.

void VideoPlayer::seek ( qint64 ms )   [slot]

Seeks to the requested time. Note that the backend is free to ignore the seek request if the media source isn't seekable.

The ms parameter is the time in milliseconds from the start of the media.

void VideoPlayer::setVolume ( float volume )   [slot]

Sets the volume of the output as voltage factor.

1.0 means 100%, 0.5 means 50% voltage/25% power, 0.0 means 0%

See also volume().

void VideoPlayer::stop ()   [slot]

Stops the playback.

qint64 VideoPlayer::totalTime () const

Get the total time (in milliseconds) of the file currently being played.

VideoWidget * VideoPlayer::videoWidget () const

Returns the video widget being used by the player.

float VideoPlayer::volume () const

This is the current volume of the output as voltage factor.

1.0 means 100%, 0.5 means 50% voltage/25% power, 0.0 means 0%

See also setVolume().


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Qt 4.4.3