Java Media Framework API

Java (TM) Media Framework API Vladimir Sakhovski [email_address]

Intro Java Media Framework (JMF) is an API for manipulation and processing of time-based media in Java applications and applets. A key characteristic of time-based media: it requires timely delivery and processing. Strict timing deadlines must be met for receiving and presentation of the data.

Intro (cont) JMF 1.0 API support for presenting of time-based media. JMF 2.0 API extends by supporting capturing and storing of media data, controlling of type of processing during playback, custom processing on media data streams plug-in API to customize and extend JMF functionality JMF 2.1.1 no changes to the API, updates to the Sun‘s implementation

Intro (cont) JMF RTP APIs are not required by JMF specification Reference implementation of JMF provided by Sun and IBM fully support JMF RTP APIs RTP APIs enable developers to receive, transmit and play RTP streams using JMF

Intro (cont) There are JMF versions for Windows, Solaris, Linux, and pure-Java version (works on any JVM) OS-specific versions should be used to increase performance

JMF data processing model Everyday-life model for operations with time-based media:

JMF data processing model (cont) JMF data processing model

JMF data processing model (cont) JMF data processing model, example

JMF input Input in JMF is generally represented by a javax.media.MediaLocator object. MediaLocator is like an URL – it uniquely identifies a resource in a network Example: media locator for an RTP session: rtp://address:port[:ssrc]/content-type/[ttl]

JMF input (cont) From MediaLocator an instance of javax.media.protocol. DataSource object can be created. It represents input data, which is used in Player s , Processor s and DataSink s .

JMF processors Input data can be directly rendered to the output destination or some manipulations can be applied before this. Processor (manipulation) component is represented by an instance of javax.media.Processor interface

JMF output The ouput of a Processor (just like the input) is presented with the instance of DataSource. This way: Processor s can be chained to perform multiple operations on the same media Output from Processor can be used as an input to a Player or DataSink (for rendering to the output destination)

JMF output (cont) Another way to represent output of the JMF process model is with javax.media.DataSink interface DataSink reads media content and renders it to some destination Example: output file, network

Simple audio player Example for a simple program to play a local audio file through a command-line interface Import import javax.media.*;

Simple audio player (cont) Player private Player audioPlayer = null; public SimpleAudioPlayer(File file) throws IOException, NoPlayerException, CannotRealizeException { audioPlayer = Manager. createRealizedPlayer(file.toUrl()); }

Simple audio player (cont) Player processes an input media data stream and renders it at a precise time. DataSource is used to deliver the input to the Player Rendering destination depends on the type of the media (example: speakers, display...)

Simple audio player (cont) A Player can be in one of the six states

Simple audio player (cont) To get an instance of the Player we use Manager class. It acts as a factory for creating many of the specific interface types in JMF, including the Player interface audioPlayer = Manager.createRealizedPlayer(file.toUrl());

Simple audio player (cont) Starting/stopping the player public void play() { audioPlayer.start(); } public void stop() { audioPlayer.stop(); audioPlayer.close(); }

Simple audio player (cont) Creating a player in the main() File audioFile = new File(args[0]); SimpleAudioPlayer player = new SimpleAudioPlayer(audioFile); player.play(); ... player.stop();

Simple audio player (cont) Simple (just a few lines of code) No need not to know anything about the media file type to configure a player, everything is handled internally

Simple video player The main difference from the audio player – we must create a visual representation to display the video

Simple video player (cont) Player has methods to get references to visual components player.getVisualComponent() player.getGainControl() player. getControlPanelComponent()

Simple video player (cont) Controls returned are instances of the java.awt.Component class and may be added to the window frame. They are tied directly to the Player – any manipulations on controls will have corresponding changes on the media played.

Resources http://java.sun.com/products/java-media/jmf/ 2.0 API Guide Code Samples and Apps http://www-106.ibm.com/developerworks/ edu/j-dw-javajmf-i.html

Java Media Framework API

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Java Media Framework API