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19 Video and Audio
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JavaFX supports two cross-platform formats: FXM and FLV Media encoded in either of these formats can be played on any device that has a JavaFX runtime, including mobile devices FLV is the video and audio format used in Flash applications; FXM is a subset of FLV and is the official JavaFX cross-platform media format It uses the VP6 video encoding developed by On2 Technologies, together with an MP3 sound track On2 Technologies provides a utility that enables you to convert media in other formats into an FXM file, which you can then use in your JavaFX applicationThis utility is not freeVisit the On2 Technologies website at http://wwwon2com for more information In addition to FXM and FLV, JavaFX can also handle media file encoded in various platform-specific formats, but only on the platforms that support those formatsThere is a complete and current list of these formats, by platform, in the Release Notes for the JavaFX software development kit (SDK) On Windows, for example, you can play MP3, WAV,WMV,AVI, and ASF files Obviously, using a platform-specific format is acceptable only if you know that your application will be used only on that platform
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The MediaPlayer and MediaView classes can be combined to form a basic video player MediaView is a node that renders video content in a rectangular area, while the MediaPlayer class provides variables and functions that allow you to control and monitor the playback of media data obtained from a Media objectTo display video, you need both a MediaPlayer and a MediaView object, whereas audio can be played with just a MediaPlayer As you can see in Figure 19-1, which shows the result of running the code in Listing 19-1,1 the MediaView class does not provide any visual controls to allow the user to start, stop, or pause playback or to change the volume level its only function is to display picture frames from a video source If you need a more complete player, you need to create your own by using the platform-independent controls that we discuss in 22, Cross-Platform Controls Some of the later examples in this chapter add buttons that allow you basic control over media playback
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The MediaPlayer class has a number of variables and functions that relate to media playbackThe variables are listed in Table 19-2
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You can try this example for yourself by running the code in the file javafxmedia/Media1fx in the JavaFX Book GUI project
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Figure 19-1
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Table 19-2 Variable
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autoPlay media rate
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Playback-Related Variables in the MediaPlayer Class Type
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Boolean Media Number Number Number
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Description
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Starts playback as soon as possible if true The media to be played
10 10
The rate and direction at which the media should be played The number of times that the media should be played The number of times that the media has so far been repeated because playback was started The time from which playback should begin or be resumed following a pause or repeat The time at which playback should stop (and begin the next cycle when repeating)
repeatCount currentCount
startTime
Duration
stopTime
Duration
Before you can play video or audio, you have to create a Media object that refers to the content to be played and then install it in the media variable of the MediaPlayer Having done this, you have a choice of two ways to start playbackThe first is to set the
19 Video and Audio
variable to true, which causes playback to begin as soon as data is available This setting is used in Listing 19-1 at the start of this chapter If you don t want immediate playback, you can use the play() function insteadTypically, you would provide a button or other control that the user would press to cause this function to be called, as you ll see in some of the later examples in this chapter You can pause or stop playback by calling the pause() or stop() functions, respectivelyThe difference between these two functions is that after stop(), the next call to play() will cause playback to begin from the start of the clip, whereas following a pause() it resumes from its current positionThe play() function does nothing if playback is already in progressYou can see the effects of these functions by running the code in the file javafxmedia/Media2fx in the JavaFX Book GUI project, which adds a couple of buttons to the MediaView that allow you to exercise the play(), pause(), and stop() functions Ordinarily, the media content will play in the forward direction and at its normal rate If you want faster or slower playback, you can use the rate variable to request this Setting this variable to 2 requests playback at twice normal speed, whereas the value -1 requests reverse playback at normal speed Some file formats do not support playback at anything other than the normal rate