The Java Media Framework (JMF) is an exciting and versatile API that the Java 2 platform, complete source files, and other tools essential for. Java Media Framework API (JMF). 19 January One of JMF’s important design considerations is to support standard protocols. JMF provides. Essential Jmf – Java Media Framework has 2 ratings and 0 reviews. Essential JMF: Java Media Framework helps you master the key elements of JMF developm.
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A comprehensive discussion of all the features JMF has to offer is well beyond the scope of this tutorial. Familiarity with AWT and Swing will help you follow the examples, but is not required.
Controller State Transition Methods. We start the MediaTransmitter by calling the startTransmitting method on it, as shown here:. Because working with media is often quite resource intensive, many of the methods exposed by JMF objects are non-blocking and allow for asynchronous notification of state changes through a series of event listeners.
In order to create the ProcessorModelwe need the following things:. In addition to the import javax. A successfully created URL object requires that the appropriate java.
Because this is a simple example, closing the Player is an acceptable way of ending a session. Getting The Media Time. To stop playing, press the Enter key. Playing It Thread- Safe. Compile the example application by typing javac MediaTransmitter.
Prefetching the MIV Player. To accomplish this, we’ll create three separate working example applications. The following Processor will be responsible for converting our MP3 audio media into an RTP representation of the audio:.
Calculating the Aggregate Duration. Walk step-by-step through constructing robust JMF-based software.
These three instance variables may be mapped directly into the above process model diagram, as follows:. If you were to write an application that handled only certain media types, you could count on certain Control objects being available through the Player instance. At this point we are all but done with setting up our media player for broadcast transmission.
We create a MediaLocator from the file, and subsequently create a DataSource from the locator. Different types of players may choose to expose controls for operations specific to a given media type or to the transport mechanism used to obtain that media. As stated previously, the MediaLocator looks and acts much like a URL, in that it uniquely identifies a resource in a network.
We will use the start and stop functionality of the Player throughout this section. A microphone is a push source because the microphone provides a continuous stream of audio data. If we find any extra controls, we can use the getControlComponent method to add their corresponding visual component to a tabbed pane. Learn how to extend the support of the Java Media Framework by creating Players for new media formats and protocols. This is also how the output from a Processor can be used as input to a Player or to a DataSink which would render the media to an output destination.
The only other thing we have to do before we can play our audio file is to call the play method on the created audio player, as shown here:. AudioFormat instance to describe the media input type see the javadoc to learn about the available formats. You should see a window that displays GUI controls for manipulating your media file.
Creating the Event List. We can talk about our final example in terms of the process model we defined in the previous section.
Almost any type of media manipulation or processing is possible through JMF. View image at full size.
Java Media Framework API (JMF) | Open Textbooks for Hong Kong
For example, HTTP is a protocol for this type of data. Java Media Framework basics. An example is multimedia broadcasting. For this reason, the Manager class also exposes utility methods for creating Realized players.
To call a non-blocking player-creation method, we use one of the createPlayer methods on the Manager class.
Relaxed Restrictions on Clock Methods. To increase performance, you wssential download the version that is specific to your OS. The following screenshot shows an audio player playing an MP3 file:.
If necessary, the demo can be run on a single machine using the machine as both the transmitter and receiver.
Essential JMF – Java Media Framework
Setting The Media Time. In this way, the tutorial will prepare you for future study and the implementation of more specific applications.
Comments Sign in or register to add and subscribe to comments. From inside the book. This book contains four distinct parts. The Manager class acts as a factory for creating many of the specific interface types exposed in JMF, including the Player interface. Start, Stop and Pause Controls.
Synchronizing the Forward Transitions.