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Because RIM s Java ME platform includes the standard set of multimedia APIs (MMAPI), developers already comfortable with Java ME development can immediately use these familiar interfaces in their programs. The Sun concept of media is based around a media Player object that plays and records media. In addition to these standard APIs, BlackBerry has also added its own set of functions that allow access to abilities that are unavailable to most Java phones. Throughout this book you will notice that such packages start with "net.rim". In contrast, Java packages start with "java" or "javax". Generally, the RIM APIs will offer more compelling features, but at the price of being more difficult to port to other platforms.
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CHAPTER 2: Media Capture
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The Sun Standard: A MediaPlayer Connection
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Historically, Sun has see-sawed between two extremes when it comes to Java. Their initial release of Java included an enormous set of libraries with a bewildering array of packages, classes, and methods. Each individual component had a very well-defined role, but that meant learning many new components. With Java ME, the pendulum swung the other way with the introduction of the Generic Connection Framework (GCF). Now you had a single component, like a Connector, that was responsible for a wide variety of tasks such as accessing the network or writing a file. The MMAPI is very similar to the GCF in that there are only a few classes to learn, but a great deal of nuance in their use. Sun broadly defines media to include all audio operations and all visual operations except for the display of still images. In the same way that you access Connection subtypes by making requests to the Connector class, you access Player instances by making requests to the Manager class. Unlike the GCF, though, there are no subclasses of Player; instead, each Player can support an arbitrary number of Control objects. Each Control allows you to manipulate some aspect of the recording/playback operation. For example, playing back a video may provide access to a VideoControl, FramePositioningControl, and VolumeControl, while playing back an audio file will offer only the VolumeControl. Figure 2-1 illustrates two possible configurations of Player objects. This sort of separation allows RIM and other manufacturers to add additional functionality based on new features, and not the specific media type.
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Figure 2-1. Obtaining different Players from a Manager
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Note: Manager and other media classes can be found under the package hierarchy.
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CHAPTER 2: Media Capture
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Push Me/Pull You
The MMAPI distinguishes between two general tasks involved in any media operation. First comes the data delivery protocol. You can think of this like the TCP/IP stack that you use to download a file over the network. TCP/IP doesn t care whether you re downloading a movie, audio, or text; it s only concerned with how to get the data to you. MMAPI uses the interface DataSource to represent the data delivery protocol. A DataSource might represent a network connection, a file connection, or even a randomized source of data. In the case of media recording, the DataSource will be the piece of hardware used to provide that media. Once the data has been delivered, the next task is to handle that data content. Content handling involves looking at the raw bytes that have arrived and then performing some task with them. MMAPI s Player class is used as a content handler. Depending on what type of content you ve asked for, it might decode an audio stream and direct it to the phone s speakers. When recording media, the Player will generally translate the raw input data into a usable format for you to consume. It is interesting to note that the same two objects have totally opposite roles when recording or playing. In a recording scenario, the DataSource deals with phone hardware and the Player writes to a representation; in a playback scenario, the DataSource reads a representation and the Player writes to phone hardware. This flexibility can make the MMAPI difficult to understand, but it also accounts for its power. By not tying themselves to the scenarios they could imagine, the MMAPI s authors have created a system that can evolve to accomplish tasks that were not possible at the time the standard was written. Note: The one aspect of the MMAPI that does not follow this DataSource/Player design is the aspect that appears to have aged badly. At the time of its creation, the majority of phones did not support compressed audio formats, and programs relied on simple tone-based audio playback. Rather than creating a DataSource for those notes and a Player to output them, the authors created a method Manager.playTone() that would generate a single note. The widespread adoption of compressed audio has rendered this method largely useless, and its presence in the API feels like an anachronism.
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