QtMultimedia Audio

Add audio playback to a scene.

Import Statement: import QtMultimedia 5.4

Properties

Signals

Methods

Detailed Description

This type is part of the QtMultimedia 5.0 module.

import QtQuick 2.0
import QtMultimedia 5.0
Text {
    text: "Click Me!";
    font.pointSize: 24;
    width: 150; height: 50;
    Audio {
        id: playMusic
        source: "music.wav"
    }
    MouseArea {
        id: playArea
        anchors.fill: parent
        onPressed:  { playMusic.play() }
    }
}

See also Video .

Property Documentation

audioRole : enumeration

This property holds the role of the audio stream. It can be set to specify the type of audio being played, allowing the system to make appropriate decisions when it comes to volume, routing or post-processing.

The audio role must be set before setting the source property.

Supported values can be retrieved with supportedAudioRoles().

The value can be one of:

  • UnknownRole - the role is unknown or undefined.
  • MusicRole - music.
  • VideoRole - soundtrack from a movie or a video.
  • VoiceCommunicationRole - voice communications, such as telephony.
  • AlarmRole - alarm.
  • NotificationRole - notification, such as an incoming e-mail or a chat request.
  • RingtoneRole - ringtone.
  • AccessibilityRole - for accessibility, such as with a screen reader.
  • SonificationRole - sonification, such as with user interface sounds.
  • GameRole - game audio.

This QML property was introduced in Qt 5.6.

autoLoad : bool

This property indicates if loading of media should begin immediately.

Defaults to true. If false, the media will not be loaded until playback is started.

autoPlay : bool

This property controls whether the media will begin to play on start up.

Defaults to false. If set to true, the value of autoLoad will be overwritten to true.

availability : enumeration

Returns the availability state of the media player.

This is one of:

Value Description
Available The media player is available to use.
Busy The media player is usually available, but some other process is utilizing the hardware necessary to play media.
Unavailable There are no supported media playback facilities.
ResourceMissing There is one or more resources missing, so the media player cannot be used. It may be possible to try again at a later time.
bufferProgress : real

This property holds how much of the data buffer is currently filled, from 0.0 (empty) to 1.0 (full).

Playback can start or resume only when the buffer is entirely filled, in which case the status is Audio.Buffered or Audio.Buffering. A value lower than 1.0 implies that the status is Audio.Stalled.

See also status.

duration : int

This property holds the duration of the media in milliseconds.

If the media doesn’t have a fixed duration (a live stream for example) this will be 0.

error : enumeration

This property holds the error state of the audio. It can be one of:

Value Description
NoError There is no current error.
ResourceError The audio cannot be played due to a problem allocating resources.
FormatError The audio format is not supported.
NetworkError The audio cannot be played due to network issues.
AccessDenied The audio cannot be played due to insufficient permissions.
ServiceMissing The audio cannot be played because the media service could not be instantiated.
errorString : string

This property holds a string describing the current error condition in more detail.

hasAudio : bool

This property holds whether the media contains audio.

hasVideo : bool

This property holds whether the media contains video.

loops : int

This property holds the number of times the media is played. A value of 0 or 1 means the media will be played only once; set to Audio.Infinite to enable infinite looping.

The value can be changed while the media is playing, in which case it will update the remaining loops to the new value.

The default is 1.

metaData.albumArtist : variant

This property holds the name of the principal artist of the album the media belongs to.

See also QMediaMetaData.

metaData.albumTitle : variant

This property holds the title of the album the media belongs to.

See also QMediaMetaData.

metaData.audioBitRate : variant

This property holds the bit rate of the media’s audio stream in bits per second.

See also QMediaMetaData.

metaData.audioCodec : variant

This property holds the encoding of the media audio stream.

See also QMediaMetaData.

metaData.author : variant

This property holds the author of the media.

See also QMediaMetaData.

metaData.averageLevel : variant

This property holds the average volume level of the media.

See also QMediaMetaData.

metaData.category : variant

This property holds the category of the media

See also QMediaMetaData.

metaData.channelCount : variant

This property holds the number of channels in the media’s audio stream.

See also QMediaMetaData.

metaData.chapterNumber : variant

This property holds the chapter number of the media.

See also QMediaMetaData.

metaData.comment : variant

This property holds a user comment about the media.

See also QMediaMetaData.

metaData.composer : variant

This property holds the composer of the media.

See also QMediaMetaData.

metaData.conductor : variant

This property holds the conductor of the media.

See also QMediaMetaData.

metaData.contributingArtist : variant

This property holds the names of artists contributing to the media.

See also QMediaMetaData.

This property holds the media’s copyright notice.

See also QMediaMetaData.

metaData.coverArtUrlLarge : variant

This property holds the URL of a large cover art image.

See also QMediaMetaData.

metaData.coverArtUrlSmall : variant

This property holds the URL of a small cover art image.

See also QMediaMetaData.

metaData.date : variant

This property holds the date of the media.

See also QMediaMetaData.

metaData.description : variant

This property holds a description of the media.

See also QMediaMetaData.

metaData.director : variant

This property holds the director of the media.

See also QMediaMetaData.

metaData.genre : variant

This property holds the genre of the media.

See also QMediaMetaData.

metaData.keywords : variant

This property holds a list of keywords describing the media.

See also QMediaMetaData.

metaData.language : variant

This property holds the language of the media, as an ISO 639-2 code.

See also QMediaMetaData.

metaData.leadPerformer : variant

This property holds the lead performer in the media.

See also QMediaMetaData.

metaData.lyrics : variant

This property holds the lyrics to the media.

See also QMediaMetaData.

metaData.mediaType : variant

This property holds the type of the media.

See also QMediaMetaData.

metaData.mood : variant

This property holds the mood of the media.

See also QMediaMetaData.

metaData.parentalRating : variant

This property holds the parental rating of the media.

See also QMediaMetaData.

metaData.peakValue : variant

This property holds the peak volume of media’s audio stream.

See also QMediaMetaData.

metaData.pixelAspectRatio : variant

This property holds the pixel aspect ratio of an image or video.

See also QMediaMetaData.

metaData.posterUrl : variant

This property holds the URL of a poster image.

See also QMediaMetaData.

metaData.publisher : variant

This property holds the publisher of the media.

See also QMediaMetaData.

metaData.ratingOrganization : variant

This property holds the name of the rating organization responsible for the parental rating of the media.

See also QMediaMetaData.

metaData.resolution : variant

This property holds the dimension of an image or video.

See also QMediaMetaData.

metaData.sampleRate : variant

This property holds the sample rate of the media’s audio stream in hertz.

See also QMediaMetaData.

metaData.size : variant

This property property holds the size of the media in bytes.

See also QMediaMetaData.

metaData.subTitle : variant

This property holds the sub-title of the media.

See also QMediaMetaData.

metaData.title : variant

This property holds the title of the media.

See also QMediaMetaData.

metaData.trackCount : variant

This property holds the number of tracks on the album containing the media.

See also QMediaMetaData.

metaData.trackNumber : variant

This property holds the track number of the media.

See also QMediaMetaData.

metaData.userRating : variant

This property holds a user rating of the media in the range of 0 to 100.

See also QMediaMetaData.

metaData.videoBitRate : variant

This property holds the bit rate of the media’s video stream in bits per second.

See also QMediaMetaData.

metaData.videoCodec : variant

This property holds the encoding of the media’s video stream.

See also QMediaMetaData.

metaData.videoFrameRate : variant

This property holds the frame rate of the media’s video stream.

See also QMediaMetaData.

metaData.writer : variant

This property holds the writer of the media.

See also QMediaMetaData.

metaData.year : variant

This property holds the year of release of the media.

See also QMediaMetaData.

muted : bool

This property holds whether the audio output is muted.

Defaults to false.

playbackRate : real

This property holds the rate at which audio is played at as a multiple of the normal rate.

Defaults to 1.0.

playbackState : enumeration

This property holds the state of media playback. It can be one of:

  • PlayingState - the media is currently playing.
  • PausedState - playback of the media has been suspended.
  • StoppedState - playback of the media is yet to begin.
playlist : Playlist

This property holds the playlist used by the media player.

Setting the playlist property resets the source to an empty string.

This QML property was introduced in Qt 5.6.

position : int

This property holds the current playback position in milliseconds.

To change this position, use the seek() method.

See also seek().

seekable : bool

This property holds whether position of the audio can be changed.

If true, calling the seek() method will cause playback to seek to the new position.

source : url

This property holds the source URL of the media.

Setting the source property clears the current playlist, if any.

status : enumeration

This property holds the status of media loading. It can be one of:

  • NoMedia - no media has been set.
  • Loading - the media is currently being loaded.
  • Loaded - the media has been loaded.
  • Buffering - the media is buffering data.
  • Stalled - playback has been interrupted while the media is buffering data.
  • Buffered - the media has buffered data.
  • EndOfMedia - the media has played to the end.
  • InvalidMedia - the media cannot be played.
  • UnknownStatus - the status of the media is unknown.
volume : real

This property holds the volume of the audio output, from 0.0 (silent) to 1.0 (maximum volume).

Defaults to 1.0.

Signal Documentation

error(error, errorString)

This signal is emitted when an error has occurred. The errorString parameter may contain more detailed information about the error.

The corresponding handler is onError.

itemAboutToBeInserted(start, end)

This signal is emitted when items are to be inserted into the playlist at start and ending at end.

The corresponding handler is onItemAboutToBeInserted.

itemAboutToBeRemoved(start, end)

This signal emitted when items are to be deleted from the playlist at start and ending at end.

The corresponding handler is onItemAboutToBeRemoved.

itemChanged(start, end)

This signal is emitted after items have been changed in the playlist between start and end positions inclusive.

The corresponding handler is onItemChanged.

itemInserted(start, end)

This signal is emitted after items have been inserted into the playlist. The new items are those between start and end inclusive.

The corresponding handler is onItemInserted.

itemRemoved(start, end)

This signal is emitted after items have been removed from the playlist. The removed items are those between start and end inclusive.

The corresponding handler is onMediaRemoved.

loadFailed()

This signal is emitted when the playlist loading failed. error and errorString can be checked for more information on the failure.

The corresponding handler is onLoadFailed.

loaded()

This signal is emitted when the playlist loading succeeded.

The corresponding handler is onLoaded.

paused()

This signal is emitted when playback is paused.

The corresponding handler is onPaused.

playbackStateChanged()

This signal is emitted when the playbackState property is altered.

The corresponding handler is onPlaybackStateChanged.

playing()

This signal is emitted when playback is started or resumed.

The corresponding handler is onPlaying.

stopped()

This signal is emitted when playback is stopped.

The corresponding handler is onStopped.

Method Documentation

pause()

Pauses playback of the media.

Sets the playbackState property to PausedState.

play()

Starts playback of the media.

Sets the playbackState property to PlayingState.

seek(offset)

If the seekable property is true, seeks the current playback position to offset.

Seeking may be asynchronous, so the position property may not be updated immediately.

See also seekable and position.

stop()

Stops playback of the media.

Sets the playbackState property to StoppedState.

list<int> supportedAudioRoles()

Returns a list of supported audio roles.

If setting the audio role is not supported, an empty list is returned.

This QML method was introduced in Qt 5.6.

See also audioRole.