HTML+TIME: DirectMusic

DHTML文档教程

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Authors can add sophisticated musical content to Web pages by combining the timeline control and synchronization offered by introduction to html+time with some of the attributes and properties provided by the microsoft?directmusic疇application programming interface (api). directmusic provides support for midi, downloadable sounds, and consistent playback on the microsoft windows?platform.

the following links provide access to the object model exposed by the time behavior.

overviews

Seeking With HTML+TIME

In HTML+TIME (Timed Interactive Multimedia Extensions) various types of media, animation, and other time elements can be played over a period of time. It is often desirable to be able to jump to any point on this time line. This process of jumping to different points on a time element's time line is called seeking.

Using HTML+TIME with DirectMusic

This article briefly discusses some of the ways you can use HTML+TIME to add flexibility and control to DirectMusic content on the Web.

Using the HTML+TIME Document Object Model (DOM)

All HTML+TIME objects are accessible through script at run time. This article introduces you to the HTML+TIME objects, methods, events, and properties available to your Web pages.

Tutorials

Incorporate the time2 Behavior

This tutorial explains how to incorporate the time2 behavior in your web pages so you can begin using timelines, multimedia, and animation with html elements.

directmusic elements and objects

currTimeState

Contains information about an HTML+TIME timeline.

Attributes and Properties

accelerate

Sets or retrieves a value that applies an acceleration to an element's timeline.

activeDur

Retrieves the total duration of the timeline.

activeTime

Retrieves the current point in time along the total active timeline, including repeats and time spent in reverse mode.

autoReverse

Sets or retrieves whether the timeline on an element begins playing in reverse immediately after completing in the forward direction.

begin

Sets or retrieves the delay time before the timeline begins playing on the element.

boundary

Sets when music should begin to play by using DirectMusic.

currentFrame

Retrieves a value that indicates the currentframe of the object.

decelerate

Sets or retrieves a value that applies a deceleration to the end of a simple duration.

dur

Sets or retrieves a value indicating the amount of time the element remains active or displayed.

end

Sets or retrieves a value indicating the end time for the element, or the end of the simple duration when the element is set to repeat.

fill

Sets or retrieves the action an element takes if its timeline ends before the timeline on its parent element ends.

immediateEnd

Sets a value that indicates whether a DirectMusic segment ends immediately or plays a transition before ending.

isActive

Retrieves a value that indicates whether the element is currently active on the timeline.

isDirectMusicInstalled

Retrieves a Boolean value that indicates whether DirectMusic is installed on the machine.

isOn

Retrieves a value that specifies whether the element is active or holding on the timeline in its current state.

isPaused

Retrieves a value that specifies whether the element is paused on the timeline.

isStreamed

Retrieves a Boolean value that indicates if the source of the media object is streamed.

longTransition

Sets whether to allow introduction and ending transitions longer than one bar with DirectMusic.

modulate

Sets whether to attempt to modulate between keys when playing transitions with DirectMusic.

motifName

Sets the name of the DirectMusic motif to play.

parentTimeBegin

Retrieves the current element's begin time as an offset from the parent element's begin time.

parentTimeEnd

Retrieves the current element's end time as an offset from the parent element's begin time.

progress

Retrieves the current progress of the element's timeline.

repeatCount

Retrieves the current iteration in the repetition loop.

repeatCount

Sets or retrieves the number of times an element's timeline repeats.

repeatDur

Sets or retrieves the number of seconds that an element's timeline repeats.

restart

Sets or retrieves the conditions under which an element can be restarted on a timeline.

segmentDur

Retrieves the duration of an element on a timeline in seconds, including autoreverse.

segmentTime

Retrieves the current point in time along a segment of time.

segmentType

Sets whether to play a DirectMusic segment as a controlling or secondary segment.

simpleDur

Retrieves the duration of a repeat iteration.

simpleTime

Retrieves an object's current point along its timeline from zero to its dur value.

speed

Sets or retrieves the playback speed of an element relative to its parent time container.

speed

Retrieves the playback speed of an element at run time, which includes the cascading effect of the speed set for the parent time container.

state

Retrieves the current state of the element's timeline.

stateString

Retrieves the current state of the element's timeline.

syncBehavior

Sets or retrieves a value that indicates the synchronization rules for the element's timeline.

syncMaster

Sets or retrieves whether the time container must synchronize playback to this element.

syncTolerance

Sets or retrieves the time variance allowed on a timeline with locked synchronization.

timeAction

Sets or retrieves what action is taken on the element while the timeline is active.

timeContainer

Sets or retrieves the type of timeline associated with an element.

timeParent

Retrieves the parent time container element of the current element.

transitionType

Sets or retrieves the type of DirectMusic transition to use between segments.

volume

Sets or retrieves the volume of the media file.

volume

Retrieves the playback volume of an element at run time.

Methods

activeTimeToParentTime

Converts a value in the element's active timeline to the corresponding point in the parent timeline.

activeTimeToSegmentTime

Converts a value in the element's active timeline to the corresponding point in the segment timeline.

beginElement

Starts the element on the timeline.

beginElementAt

Starts an element's timeline at the specified time.

documentTimeToParentTime

Converts a value in the document timeline to the corresponding point in the element's parent timeline.

endElement

Stops the element on the timeline.

endElementAt

Ends an element's timeline at the specified time.

parentTimeToActiveTime

Converts a value in the parent timeline to the corresponding point in the element's active timeline.

parentTimeToDocumentTime

Converts a value in the element's parent timeline to the corresponding point in the document timeline.

pauseElement

Stops playing an element's timeline at the current point.

resetElement

Removes any changes made to the element and returns the element to its original state.

resumeElement

Restarts the element's timeline from a paused state.

seekActiveTime

Locates a specified point on the element's active timeline and begins playing from that point.

seekTo

Locates a specified point on the element's segment timeline, including repetitions, and begins playing from that point.

seekToFrame

Locates a specified frame in the object.

segmentTimeToActiveTime

Converts a value in the element's segment timeline to the corresponding point in the element's active timeline.

segmentTimeToSimpleTime

Converts a value in the element's segment timeline to the corresponding point in the element's simple timeline.

simpleTimeToSegmentTime

Converts a value in the element's simple timeline to the corresponding point in the element's segment timeline.

Events

onbegin

Fires when the timeline starts on an element.

onend

Fires when the timeline stops on an element.

onmediacomplete

Fires when the element's associated media finish loading.

onmediaerror

Fires when an element's media file causes any error.

onoutofsync

Fires when the element loses synchronization with its associated timeline.

onpause

Fires when the timeline on an element pauses.

onrepeat

Fires when the timeline repeats on an element, beginning with the second iteration.

onreset

Fires when the timeline reaches the value of the begin attribute or when the resetelement method is called on the element.

onresume

Fires when an element's timeline resumes from a paused state.

onreverse

Fires when the timeline on an element begins to play backward.

onseek

Fires whenever a seek operation is performed on the element.

onsyncrestored

Fires when synchronization is resumed between the element and its associated timeline.

ontimeerror

Fires whenever a time-specific error occurs, usually as a result of setting a property to an invalid value.