VideoPlayer

Table of contents

Video playback. Implements MediaPlayer common interface for players

Create from source

func NewVideoPlayer(session Session, params Params) VideoPlayer

Create new video player object and returns its interface

Create from resource

VideoPlayer {
    id = videoPlayer,
    src = video.mp4,
    video-width = 320,
}

Interface description

Inherit methods, properties and events from MediaPlayer

Properties

"controls"

Whether the browser need to provide controls to allow user to control video playback, volume, seeking and pause/resume playback. Default value is false

Constant: Controls

Types: bool, int, string

Values

bool int string Description
true 1 "true", "yes", "on", "1" The browser will offer controls to allow the user to control video playback, volume, seeking and pause/resume playback
false 0 "false", "no", "off", "0" No controls will be visible to the end user

"loop"

Controls whether the video player will play media in a loop. Default value is false

Constant: Loop

Types: bool, int, string

Values

bool int string Description
true 1 "true", "yes", "on", "1" The video player will automatically seek back to the start upon reaching the end of the video
false 0 "false", "no", "off", "0" Video player will stop playing when the end of the media file has been reached

"muted"

Controls whether the video will be initially silenced. Default value is false

Constant: Muted

Types: bool, int, string

Values

bool int string Description
true 1 "true", "yes", "on", "1" Video will be muted
false 0 "false", "no", "off", "0" Video playing normally

"poster"

Defines an URL for an image to be shown while the video is downloading. If this attribute isn't specified, nothing is displayed until the first frame is available, then the first frame is shown as the poster frame

Constant: Poster

Types: string

Examples

VideoPlayer {
    src = video.mp4,
    poster = video-poster.jpg
    video-width = 320,
}

video := rui.NewVideoPlayer(session, rui.Params{
    rui.Source:     "video.mp4",
    rui.Poster:     "video-poster.jpg",
    rui.VideoWidth: 320,
})

video := rui.NewVideoPlayer(session, rui.Params{
    rui.Source:     "video.mp4",
    rui.Poster:     "https://www.someserver.com/images/video-poster.jpg",
    rui.VideoWidth: 320,
})

"preload"

Property is intended to provide a hint to the browser about what the author thinks will lead to the best user experience. Default value is different for each browser

Constant: Preload

Types: int, string

Values

int string Description
0(PreloadNone) "none" Media file must not be pre-loaded
1(PreloadMetadata) "metadata" Only metadata is preloaded
2(PreloadAuto) "auto" The entire media file can be downloaded even if the user doesn't have to use it

"src"

Specifies the location of the media file(s). Since different browsers support different file formats and codecs, it is recommended to specify multiple sources in different formats. The player chooses the most suitable one from the list of sources. Setting mime types makes this process easier for the browser

Constant: Source

Types: string, MediaSource, []MediaSource

Internal type is []MediaSource, other types converted to it during assignment

Examples

VideoPlayer {
    id = videoPlayer,
    src = video.mp4,
},

player := rui.NewVideoPlayer(session, rui.Params{
    rui.Source: "video.mp4",
})

player := rui.NewVideoPlayer(session, rui.Params{
    rui.Source: []rui.MediaSource{
        {
            Url: "video.mp4", MimeType: "video/mp4",
        },
    },
})

player := rui.NewVideoPlayer(session, rui.Params{
    rui.Source: []rui.MediaSource{
        {
            Url: "video.mp4", MimeType: "video/mp4",
        },
        {
            Url: "video.webm", MimeType: "video/webm",
        },
    },
})

"video-height"

Defines the height of the video's display area in pixels

Constant: VideoHeight

Types: float, int, string

Internal type is float, other types converted to it during assignment

Examples

VideoPlayer {
    src = video.mp4,
    video-height = 560,
},

player := rui.NewVideoPlayer(session, rui.Params{
    rui.Source: "video.mp4",
    rui.VideoHeight: 560,
})

"video-width"

Defines the width of the video's display area in pixels

Constant: VideoWidth

Types: float, int, string

Values

Internal type is float, other types converted to it during assignment

Examples

VideoPlayer {
    src = video.mp4,
    video-width = 320,
},

player := rui.NewVideoPlayer(session, rui.Params{
    rui.Source: "video.mp4",
    rui.VideoWidth: 320,
})

Events

"abort-event"

Fired when the resource was not fully loaded, but not as the result of an error

Constant: AbortEvent

General listener format:

func(player rui.MediaPlayer)

where: * player - Interface of a player which generated this event

Allowed listener formats:

func()

"can-play-event"

Occur when the browser can play the media, but estimates that not enough data has been loaded to play the media up to its end without having to stop for further buffering of content

Constant: CanPlayEvent

General listener format:

func(player rui.MediaPlayer)

where: * player - Interface of a player which generated this event

Allowed listener formats:

func()

"can-play-through-event"

Occur when the browser estimates it can play the media up to its end without stopping for content buffering

Constant: CanPlayThroughEvent

General listener format:

func(player rui.MediaPlayer)

where: * player - Interface of a player which generated this event

Allowed listener formats:

func()

"complete-event"

Occur when the rendering of an OfflineAudioContext has been terminated

Constant: CompleteEvent

General listener format:

func(player rui.MediaPlayer)

where: * player - Interface of a player which generated this event

Allowed listener formats:

func()

"duration-changed-event"

Occur when the duration attribute has been updated

Constant: DurationChangedEvent

General listener format:

func(player rui.MediaPlayer, duration float64)

where: * player - Interface of a player which generated this event * duration - Current duration

Allowed listener formats:

func(player rui.MediaPlayer)

func(duration float64)

func()

"emptied-event"

Occur when the media has become empty; for example, this event is sent if the media has already been loaded(or partially loaded), and the HTMLMediaElement.load method is called to reload it

Constant: EmptiedEvent

General listener format:

func(player rui.MediaPlayer)

where: * player - Interface of a player which generated this event

Allowed listener formats:

func()

"ended-event"

Occur when the playback has stopped because the end of the media was reached

Constant: EndedEvent

General listener format:

func(player rui.MediaPlayer)

where: * player - Interface of a player which generated this event

Allowed listener formats:

func()

"load-start-event"

Fired when the browser has started to load a resource

Constant: LoadStartEvent

General listener format:

func(player rui.MediaPlayer)

where: * player - Interface of a player which generated this event

Allowed listener formats:

func()

"loaded-data-event"

Occur when the first frame of the media has finished loading

Constant: LoadedDataEvent

General listener format:

func(player rui.MediaPlayer)

where: * player - Interface of a player which generated this event

Allowed listener formats:

func()

"loaded-metadata-event"

Occur when the metadata has been loaded

Constant: LoadedMetadataEvent

General listener format:

func(player rui.MediaPlayer)

where: * player - Interface of a player which generated this event

Allowed listener formats:

func()

"pause-event"

Occur when the playback has been paused

Constant: PauseEvent

General listener format:

func(player rui.MediaPlayer)

where: * player - Interface of a player which generated this event

Allowed listener formats:

func()

"play-event"

Occur when the playback has begun

Constant: PlayEvent

General listener format:

func(player rui.MediaPlayer)

where: * player - Interface of a player which generated this event

Allowed listener formats:

func()

"player-error-event"

Fired when the resource could not be loaded due to an error(for example, a network connectivity problem)

Constant: PlayerErrorEvent

General listener format:

func(player rui.MediaPlayer, code int, message string)

where: * player - Interface of a player which generated this event * code - Error code. See below * message - Error message

Error code Description
0(PlayerErrorUnknown) Unknown error
1(PlayerErrorAborted) Fetching the associated resource was interrupted by a user request
2(PlayerErrorNetwork) Some kind of network error has occurred that prevented the media from successfully ejecting, even though it was previously available
3(PlayerErrorDecode) Although the resource was previously identified as being used, an error occurred while trying to decode the media resource
4(PlayerErrorSourceNotSupported) The associated resource object or media provider was found to be invalid

Allowed listener formats:

func(code int, message string)

func(player rui.MediaPlayer)

func()

"playing-event"

Occur when the playback is ready to start after having been paused or delayed due to lack of data

Constant: PlayingEvent

General listener format:

func(player rui.MediaPlayer)

where: * player - Interface of a player which generated this event

Allowed listener formats:

func()

"progress-event"

Fired periodically as the browser loads a resource

Constant: ProgressEvent

General listener format:

func(player rui.MediaPlayer)

where: * player - Interface of a player which generated this event

Allowed listener formats:

func()

"rate-changed-event"

Occur when the playback rate has changed

Constant: RateChangedEvent

General listener format:

func(player rui.MediaPlayer, rate float64)

where: * player - Interface of a player which generated this event * rate - Playback rate

Allowed listener formats:

func(player rui.MediaPlayer)

func(rate float64)

func()

"seeked-event"

Occur when a seek operation completed

Constant: SeekedEvent

General listener format:

func(player rui.MediaPlayer)

where: * player - Interface of a player which generated this event

Allowed listener formats:

func()

"seeking-event"

Occur when a seek operation has began

Constant: SeekingEvent

General listener format:

func(player rui.MediaPlayer)

where: * player - Interface of a player which generated this event

Allowed listener formats:

func()

"stalled-event"

Occur when the user agent is trying to fetch media data, but data is unexpectedly not forthcoming

Constant: StalledEvent

General listener format:

func(player rui.MediaPlayer)

where: * player - Interface of a player which generated this event

Allowed listener formats:

func()

"suspend-event"

Occur when the media data loading has been suspended

Constant: SuspendEvent

General listener format:

func(player rui.MediaPlayer)

where: * player - Interface of a player which generated this event

Allowed listener formats:

func()

"time-update-event"

Occur when the time indicated by the currentTime attribute has been updated

Constant: TimeUpdateEvent

General listener format:

func(player rui.MediaPlayer, time float64)

where: * player - Interface of a player which generated this event * time - Current time

Allowed listener formats:

func(player rui.MediaPlayer)

func(time float64)

func()

"volume-changed-event"

Occur when the volume has changed

Constant: VolumeChangedEvent

General listener format:

func(player rui.MediaPlayer, volume float64)

where: * player - Interface of a player which generated this event * volume - New volume level

Allowed listener formats:

func(player rui.MediaPlayer)

func(volume float64)

func()

"waiting-event"

Occur when the playback has stopped because of a temporary lack of data

Constant: WaitingEvent

General listener format:

func(player rui.MediaPlayer)

where: * player - Interface of a player which generated this event

Allowed listener formats:

func()

func IsMediaPlayerEnded(view View, playerID string) bool

Tells whether the media element is ended

func IsMediaPlayerPaused(view View, playerID string) bool

Tells whether the media element is paused

func MediaPlayerCurrentTime(view View, playerID string) float64

Returns the current playback time in seconds

func MediaPlayerDuration(view View, playerID string) float64

Returns the value indicating the total duration of the media in seconds. If no media data is available, the returned value is NaN

func MediaPlayerPause(view View, playerID string)

Pause playback of the media, if the media is already in a paused state this method will have no effect

func MediaPlayerPlay(view View, playerID string)

Attempts to begin playback of the media

func MediaPlayerPlaybackRate(view View, playerID string) float64

Returns the rate at which the media is being played back

func MediaPlayerVolume(view View, playerID string) float64

Returns the audio volume from 0.0 (silent) to 1.0 (loudest)

func SetMediaPlayerCurrentTime(view View, playerID string, seconds float64)

Set the current playback time in seconds

func SetMediaPlayerPlaybackRate(view View, playerID string, rate float64)

Set the rate at which the media is being played back. This is used to implement user controls for fast forward, slow motion, and so forth. The normal playback rate is multiplied by this value to obtain the current rate, so a value of 1.0 indicates normal speed

func SetMediaPlayerVolume(view View, playerID string, volume float64)

Set the audio volume from 0.0 (silent) to 1.0 (loudest)

func VideoPlayerByID(rootView View, id string) VideoPlayer

Return a VideoPlayer with id equal to the argument of the function or nil if there is no such View or View is not a VideoPlayer

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