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import QtQuick 2.0
import QtMultimedia 5.13

/*!
    \qmltype Video
    \inherits Item
    \ingroup multimedia_qml
    \ingroup multimedia_video_qml
    \inqmlmodule QtMultimedia
    \brief A convenience type for showing a specified video.

    \c Video is a convenience type combining the functionality
    of a \l MediaPlayer and a \l VideoOutput into one. It provides
    simple video playback functionality without having to declare multiple
    types.

    \qml
    Video {
        id: video
        width : 800
        height : 600
        source: &quot;video.avi&quot;

        MouseArea {
            anchors.fill: parent
            onClicked: {
                video.play()
            }
        }

        focus: true
        Keys.onSpacePressed: video.playbackState == MediaPlayer.PlayingState ? video.pause() : video.play()
        Keys.onLeftPressed: video.seek(video.position - 5000)
        Keys.onRightPressed: video.seek(video.position + 5000)
    }
    \endqml

    \c Video supports untransformed, stretched, and uniformly scaled
    video presentation. For a description of stretched uniformly scaled
    presentation, see the \l fillMode property description.

    \sa MediaPlayer, VideoOutput

\omit
    \section1 Screen Saver

    If it is likely that an application will be playing video for an extended
    period of time without user interaction, it may be necessary to disable
    the platform&#039;s screen saver. The \l ScreenSaver (from \l QtSystemInfo)
    may be used to disable the screensaver in this fashion:

    \qml
    import QtSystemInfo 5.0

    ScreenSaver { screenSaverEnabled: false }
    \endqml
\endomit
*/

// TODO: Restore Qt System Info docs when the module is released

Item {
    id: video

    /*** Properties of VideoOutput ***/
    /*!
        \qmlproperty enumeration Video::fillMode

        Set this property to define how the video is scaled to fit the target
        area.

        \list
        \li VideoOutput.Stretch - the video is scaled to fit
        \li VideoOutput.PreserveAspectFit - the video is scaled uniformly to fit without
            cropping
        \li VideoOutput.PreserveAspectCrop - the video is scaled uniformly to fill, cropping
            if necessary
        \endlist

        Because this type is for convenience in QML, it does not
        support enumerations directly, so enumerations from \c VideoOutput are
        used to access the available fill modes.

        The default fill mode is preserveAspectFit.
    */
    property alias fillMode:            videoOut.fillMode

    /*!
        \qmlproperty enumeration Video::flushMode

        Set this property to define what \c Video should show
        when playback is finished or stopped.

        \list
        \li VideoOutput.EmptyFrame - clears video output.
        \li VideoOutput.FirstFrame - shows the first valid frame.
        \li VideoOutput.LastFrame - shows the last valid frame.
        \endlist

        The default flush mode is EmptyFrame.
        \since 5.15
    */
    property alias flushMode:            videoOut.flushMode

    /*!
        \qmlproperty int Video::orientation

        The orientation of the \c Video in degrees. Only multiples of 90
        degrees is supported, that is 0, 90, 180, 270, 360, etc.
    */
    property alias orientation:         videoOut.orientation


    /*** Properties of MediaPlayer ***/

    /*!
        \qmlproperty enumeration Video::playbackState

        This read only property indicates the playback state of the media.

        \list
        \li MediaPlayer.PlayingState - the media is playing
        \li MediaPlayer.PausedState - the media is paused
        \li MediaPlayer.StoppedState - the media is stopped
        \endlist

        The default state is MediaPlayer.StoppedState.
    */
    property alias playbackState:        player.playbackState

    /*!
        \qmlproperty bool Video::autoLoad

        This property indicates if loading of media should begin immediately.

        Defaults to true, if false media will not be loaded until playback is
        started.
    */
    property alias autoLoad:        player.autoLoad

    /*!
        \qmlproperty real Video::bufferProgress

        This property holds how much of the data buffer is currently filled,
        from 0.0 (empty) to 1.0
        (full).
    */
    property alias bufferProgress:  player.bufferProgress

    /*!
        \qmlproperty int Video::duration

        This property holds the duration of the media in milliseconds.

        If the media doesn&#039;t have a fixed duration (a live stream for example)
        this will be 0.
    */
    property alias duration:        player.duration

    /*!
        \qmlproperty enumeration Video::error

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

        \list
        \li MediaPlayer.NoError - there is no current error.
        \li MediaPlayer.ResourceError - the video cannot be played due to a problem
            allocating resources.
        \li MediaPlayer.FormatError - the video format is not supported.
        \li MediaPlayer.NetworkError - the video cannot be played due to network issues.
        \li MediaPlayer.AccessDenied - the video cannot be played due to insufficient
            permissions.
        \li MediaPlayer.ServiceMissing -  the video cannot be played because the media
            service could not be
        instantiated.
        \endlist
    */
    property alias error:           player.error

    /*!
        \qmlproperty string Video::errorString

        This property holds a string describing the current error condition in more detail.
    */
    property alias errorString:     player.errorString

    /*!
        \qmlproperty enumeration Video::availability

        Returns the availability state of the video instance.

        This is one of:
        \table
        \header \li Value \li Description
        \row \li MediaPlayer.Available
            \li The video player is available to use.
        \row \li MediaPlayer.Busy
            \li The video player is usually available, but some other
               process is utilizing the hardware necessary to play media.
        \row \li MediaPlayer.Unavailable
            \li There are no supported video playback facilities.
        \row \li MediaPlayer.ResourceMissing
            \li There is one or more resources missing, so the video player cannot
               be used.  It may be possible to try again at a later time.
        \endtable
     */
    property alias availability:    player.availability

    /*!
        \qmlproperty bool Video::hasAudio

        This property holds whether the current media has audio content.
    */
    property alias hasAudio:        player.hasAudio

    /*!
        \qmlproperty bool Video::hasVideo

        This property holds whether the current media has video content.
    */
    property alias hasVideo:        player.hasVideo

    /*!
        \qmlproperty object Video::metaData

        This property holds the meta data for the current media.

        See \l{MediaPlayer::metaData}{MediaPlayer.metaData} for details about each meta data key.

        \sa {QMediaMetaData}
    */
    property alias metaData:        player.metaData

    /*!
        \qmlproperty bool Video::muted

        This property holds whether the audio output is muted.
    */
    property alias muted:           player.muted

    /*!
        \qmlproperty real Video::playbackRate

        This property holds the rate at which video is played at as a multiple
        of the normal rate.
    */
    property alias playbackRate:    player.playbackRate

    /*!
        \qmlproperty int Video::position

        This property holds the current playback position in milliseconds.

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

        \sa seek()
    */
    property alias position:        player.position

    /*!
        \qmlproperty enumeration Video::audioRole

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

        customAudioRole is cleared when this property is set to anything other than CustomRole.

        \since 5.6
    */
    property alias audioRole:       player.audioRole

    /*!
        \qmlproperty string Video::customAudioRole

        This property holds the role of the audio stream when the backend supports audio roles
        unknown to Qt. 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.

        audioRole is set to CustomRole when this property is set.

        \since 5.11
    */
    property alias customAudioRole: player.customAudioRole

    /*!
        \qmlproperty bool Video::seekable

        This property holds whether the playback position of the video can be
        changed.

        If true, calling the \l seek() method will cause playback to seek to the new position.
    */
    property alias seekable:        player.seekable

    /*!
        \qmlproperty url Video::source

        This property holds the source URL of the media.

        Setting the \l source property clears the current \l playlist, if any.
    */
    property alias source:          player.source

    /*!
        \qmlproperty Playlist Video::playlist

        This property holds the playlist used by the media player.

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

        \since 5.6
    */
    property alias playlist:        player.playlist

    /*!
        \qmlproperty enumeration Video::status

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

        \list
        \li MediaPlayer.NoMedia - no media has been set.
        \li MediaPlayer.Loading - the media is currently being loaded.
        \li MediaPlayer.Loaded - the media has been loaded.
        \li MediaPlayer.Buffering - the media is buffering data.
        \li MediaPlayer.Stalled - playback has been interrupted while the media is buffering data.
        \li MediaPlayer.Buffered - the media has buffered data.
        \li MediaPlayer.EndOfMedia - the media has played to the end.
        \li MediaPlayer.InvalidMedia - the media cannot be played.
        \li MediaPlayer.UnknownStatus - the status of the media cannot be determined.
        \endlist
    */
    property alias status:          player.status

    /*!
        \qmlproperty real Video::volume

        This property holds the audio volume.

        The volume is scaled linearly from \c 0.0 (silence) to \c 1.0 (full volume). Values outside
        this range will be clamped.

        The default volume is \c 1.0.

        UI volume controls should usually be scaled nonlinearly. For example, using a logarithmic
        scale will produce linear changes in perceived loudness, which is what a user would normally
        expect from a volume control. See \l {QtMultimedia::QtMultimedia::convertVolume()}{QtMultimedia.convertVolume()}
        for more details.
    */
    property alias volume:          player.volume

    /*!
        \qmlproperty bool Video::autoPlay

        This property determines whether the media should begin playback automatically.

        Setting to \c true also sets \l autoLoad to \c true. The default is \c false.
    */
    property alias autoPlay:        player.autoPlay

    /*!
        \qmlproperty int Video::notifyInterval

        The interval at which notifiable properties will update.

        The notifiable properties are \l position and \l bufferProgress.

        The interval is expressed in milliseconds, the default value is 1000.

        \since 5.9
    */
    property alias notifyInterval:  player.notifyInterval

    /*!
        \qmlproperty int Video::loops

        This property holds the number of times the media is played. A value of \c 0 or \c 1 means
        the media will be played only once; set to \c MediaPlayer.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 \c 1.

        \since 5.9
    */
    property alias loops:           player.loops

    /*!
        \qmlsignal Video::paused()

        This signal is emitted when playback is paused.

        The corresponding handler is \c onPaused.
    */
    signal paused

    /*!
        \qmlsignal Video::stopped()

        This signal is emitted when playback is stopped.

        The corresponding handler is \c onStopped.
    */
    signal stopped

    /*!
        \qmlsignal Video::playing()

        This signal is emitted when playback is started or continued.

        The corresponding handler is \c onPlaying.
    */
    signal playing

    VideoOutput {
        id: videoOut
        anchors.fill: video
        source: player
    }

    MediaPlayer {
        id: player
        onPaused:  video.paused()
        onStopped: video.stopped()
        onPlaying: video.playing()
    }

    /*!
        \qmlmethod Video::play()

        Starts playback of the media.
    */
    function play() {
        player.play();
    }

    /*!
        \qmlmethod Video::pause()

        Pauses playback of the media.
    */
    function pause() {
        player.pause();
    }

    /*!
        \qmlmethod Video::stop()

        Stops playback of the media.
    */
    function stop() {
        player.stop();
    }

    /*!
        \qmlmethod Video::seek(offset)

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

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

        \sa seekable, position
    */
    function seek(offset) {
        player.seek(offset);
    }

    /*!
        \qmlmethod list&lt;int&gt; Video::supportedAudioRoles()

        Returns a list of supported audio roles.

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

        \since 5.6
        \sa audioRole
    */
    function supportedAudioRoles() {
        return player.supportedAudioRoles();
    }

}
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