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The MMAPI is capable of automatically retrieving and playing remote media resources. Therefore, you might want to place media files on an HTTP server and request them when necessary. You won t need to handle the actual network connection and download yourself, although you should still be prepared to handle errors if the file cannot be accessed.
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Pass the media file location to the Manager using a URL that begins with http:// or https://. If you know at the time you create your application where the file will be located, you can simply hard-code the string. However, if you are creating a networked application, it is better to have the server pass the URL down to the client. This gives you greater flexibility if you later decide that you need to place the files on another server, change their format, or make other changes.
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Pros: Flexibility. You can update the media file contents without requiring the user to download a new version of the file. For example, you could offer new music for a game. Size. Because you are loading off the network, you don t need to place any additional files in your app or in permanent memory. This keeps your users happy.
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CHAPTER 3: Media Playback
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Cons: Reliability. You must be prepared to deal with network failures. Depending on your app, you may offer an offline mode if the file cannot be reached; otherwise, your app will not run when there is no connection. Speed. The file may take quite some time to download, especially if it is large or the user has a slow connection. Memory. Because the file isn t streaming, the entire contents must be buffered in RAM. Large video files will likely cause you to run out of memory.
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Simply pass a URL to Manager.createPlayer(). The URL should contain the complete path to the network resource, such as "http://myserver.com/files/sample.mp3".
Network Stream
One of the most impressive capabilities of the MMAPI is its ability to handle streaming protocols. Streams allow the device to play the media while it is downloading, without requiring you to acquire the entire file first. Not every manufacturer supports this, but RIM handsets do, starting with device software version 4.3. Streaming is a fairly complex process the player needs to judge how much content to buffer, decide when to start playing, and react properly when the network connection speeds up, slows down, or drops out. Fortunately, these details are hidden from you, and you can simply pass the proper URL and let the Player work its magic.
How to Use
Pass the media file location to the Manager using a URL that begins with rtsp://. As with media download, you can hard-code the string or obtain it from another resource. Make sure that the RTSP server you are connecting with is properly configured for serving up mobile content. A stream designed for a desktop web browser will likely have far too much data for a mobile device, and trying to access it directly will result in choppiness or other problems.
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Pros: Speed. Compared with a regular network download, streams allow you to start playing content much more quickly.
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CHAPTER 3: Media Playback
Flexibility. As with network downloads, you have control over a stream s content and can update it without modifying installed apps. Live media. Unlike regular audio files, which must be of a fixed length, streams can run indefinitely. This allows support for radio stations, live commentary, or other on-the-fly audio delivery. Cons: Compatibility. Your users must be using a recent version of RIM device software. Reliability. While streams have some ability to recover from temporary network problems, they will be of no use if the user is not on the network at all. Speed. While faster than a network download, streaming will be slower than a locally served file. Quality. RTSP allows for lossy data transmission if certain packets cannot be delivered, the player simply won t play them. If the device has a bad connection, the resulting media will seem choppy or worse.
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