Using media in JavaFX in Java

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Using media in JavaFX
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The time has come to learn how JavaFX handles media, such as the video files we ll be playing in our application. Before we look at the JavaFX Script code itself, let s invest time in learning about the theory. We ll start with figure 6.10.
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Figure 6.9 A closer look at our List and ListPane, with hover effect visible on the background of the list items
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Making the list: Video Player, version 2
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MediaView MediaPlayer Media
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Scene graph
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Figure 6.10 Like other JavaFX user interface elements, video is played via a dedicated MediaView scene graph node. (Note: MediaPlayer is not a visual element; the control icons are symbolic.)
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To plug a video into the JavaFX scene graph takes three classes, located in the javafx.scene.media package. They are demonstrated in figure 6.10; starting from the outside, and working in, they are:
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The MediaView class, which acts as a bridge between the scene graph and any visual media that needs to be displayed within it. MediaView isn t needed to play audio-only media, because sound isn t displayed in the scene graph. The MediaPlayer class, which controls how the media is played; for example, stopping, restarting, skipping forward or backward, slowed down or sped up. MediaPlayer can be used to control audio or video. Important: MediaPlayer merely permits programmatic control of media; it provides no actual UI controls (figure 6.10 is symbolic). If you want play/pause/stop buttons, you must provide them yourself (and have them manipulate the MediaPlayer object). The Media class, which encapsulates the actual video and/or audio data to be played by the MediaPlayer.
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As with images, JavaFX prefers to work with URLs rather than directly with local directory paths and filenames. If you read the API documentation, you ll see that the classes are designed to work with different types of media and to make allowances for data being streamed across a network. The data formats supported fall into two categories. First, JavaFX will make use of the runtime operating system s media support, allowing it to play formats supported on the current platform. Second, for cross-platform applications JavaFX includes its own codec, available no matter what the capabilities of the underlying operating system. Table 6.1 shows the support on different platforms. At the time this book was written, the details for Linux media support were not available, although the same mix of native and cross-platform codecs is expected. The cross-platform video comes from a partnership deal Sun made with On2 for its Video VP6 decoder. On2 is best known for providing the software supporting Flash s own video decoder. The VP6 decoder plays FXM media on all JavaFX platforms, including mobile (and presumably TV too, when it arrives) without any extra
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Table 6.1
Moving pictures
JavaFX media support on various operating systems Platform Codecs Video: H.261, H.263, and H.264 codecs. MPEG-1, MPEG-2, and MPEG-4 Video file formats and associated codecs (such as AVC). Sorenson Video 2 and 3 codecs. Audio: AIFF, MP3, WAV, MPEG-4 AAC Audio (.m4a, .m4b, .m4p), MIDI. Video: Windows Media Video, H264 (as an update). Audio: MPEG-1, MP3, Windows Media Audio, MIDI. Video: On2 VP6. Audio: MP3. Formats 3GPP / 3GPP2, AVI, MOV, MP4, MP3
Mac OS X 10.4 and above (Core Video)
Windows XP/Vista (DirectShow) JavaFX (cross platform)
MP3, WAV, WMV, AVI, ASF FLV, FXM (Sun defined FLV subset), MP3
software installation. Regrettably, the only encoder for the On2 format at the time of writing seems to be On2 Flix, a proprietary commercial product. Now that you understand the theory, let s push on to the final part of the project, where we build a working video player.
The Player class, version 2: video and linear gradients
We now have all the pieces; all that remains is to pull them together. The listing that follows is our largest single source file yet, almost 200 lines (be thankful this isn t a Java book, or it could have been 10 times that). I ve broken it up into three parts, each dealing with different stages of the application. The opening part is listing 6.10.
Listing 6.10 Player.fx (version 2, part 1)
package jfxia.chapter6; import import import import import import import import import import import import import import import import import import import javafx.geometry.HPos; javafx.geometry.VPos; javafx.scene.Group; javafx.scene.Scene; javafx.scene.control.Slider; javafx.scene.effect.Reflection; javafx.scene.input.MouseEvent; javafx.scene.layout.LayoutInfo; javafx.scene.layout.Stack; javafx.scene.media.Media; javafx.scene.media.MediaPlayer; javafx.scene.media.MediaView; javafx.scene.paint.Color; javafx.scene.paint.LinearGradient; javafx.scene.paint.Stop; javafx.scene.shape.Rectangle; javafx.scene.text.Font; javafx.scene.text.Text; javafx.scene.text.TextOrigin;
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