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Blu-ray Disc Demystified
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System Overview
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BD-J applications interact with the user to control the player The system model, depicted in Figure 614, shows four components that communicate with each other On the lowest level, the Resources represent the capabilities of the player, such as decoding, memory management, and the player control The BD-J module includes the Java Virtual Machine (JVM) on which the applications run and the Application Manager, which determines what application runs The BD-J module also translates the Application Programming Interface (API) calls to access the necessary resources The BD-J API component is a collection of functions and objects to communicate with the player The BD-J applications use the API to load files, access the network, control the disc playback, any any other function that requires the player to perform a task The top level of the system model is the BD-J application, which uses a so-called Xlet, a term inherited from JavaTV It is very similar to an applet, which is a lightweight application commonly used for web applications In this context, Xlets follow the same lifecycle definitions with multiple states loaded, paused, activated, and destroyed Figure 614 BD-J System Overview
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Resources (player control, decoders, files, sounds, etc)
Resources and BD-J Module
There are a number of different resources that can be accessed by the BD-J application, such as graphics, sounds, JARs (Java Archives), and the AV structure on or off the disc In order to access and manage these resources, the BD-J module is used The BD-J module provides an abstraction layer between the player and the disc application It uses the appli-
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Blu-ray Disc Demystified
Application Details
cation cache, which is best described as a pre-load buffer for the application All files (JARs, and other files or directories) necessary to properly run the application will be loaded into this cache Once they are loaded into the cache, the application manager can take control The manager can load or unload individual applications and manage their lifecycles, accordingly Besides the application cache, there are other memory buffers holding additional resources that can be accessed by the BD-J module Table 617 outlines the various buffers and their respective sizes, which vary between the different player profiles Table 617 BD-J Memory Overview
Memory Description Profile 1 Profile 2
Application cache Used to load JAR files and directories Font buffer Used to load fonts to be rendered by the BD-J application
4MB 4MB 455MB (5MB can be used for audio)
4MB 4MB 615MB (65MB can be used for audio)
Image and audio Images and audio files used by an application memorya will be decoded into this memory Audio files can only take a portion of this memory
aButton sounds are stored in a
soundbdmv file The memory for images and audio does not include the soundbdmv file (up to 2MB) but, instead, provides additional space for interactive audio
Now, a question may come to mind of why the different buffers are necessary In a reallife scenario, the JAR files may contain a lot of class files (Java code) and a bunch of compressed images (PNG, JPEG, et cetera) These JAR files will then be loaded into the application cache However, in order for the application module to use the images inside the JARs, they have to be decompressed This would happen next and, as a result, all uncompressed images will be available in the image memory Then the application can be executed and displayed on the screen It is very similar with the font buffer In order for an application to use a font, it has to be copied into a buffer to be accessible Because some fonts, particularly Asian fonts with many complex characters, may take up a lot of space, it may not be possible to render the font in a timely manner By using the buffer, however, fast interaction is possible In other words, fonts can be generated on-the-fly as the characters are pre-loaded in the buffer
BD-J Application Programming Interface (API)
A programmer interacts with the player by using Application Programming Interfaces (API) There are API functions for pretty much anything you can imagine mathematical operations, file I/O, playback control, graphics display and animations, text rendering, network access, local storage management, and so on However, the API set for BD-J programmng is a bit more complicated and requires some background on how the BD-J specification came about It is very common for a format specification to reference other specifications For instance, the DVD specification references various audio and video specifications such as MPEG, Dolby, DTS, and others However, from a programming perspective, DVD has always been very self-contained in the sense that everything you needed to know was defined in one doc-
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