java media framework presentation

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PRESENTED BY :

GAURAV KUMAR SRIVASTAVA


Company profile

Company Name:: Canon Inc.

Founded:: August 10, 1937

Headquarters:: Tokyo, Japan.

Chairman & CEO:: Fujio Mitarai

Canon ISDC:: noida and

bangalore


Discussion topics Time based media

Media processing model

Media framework

Jmf architecture

Jmf classes and interfaces

Applet video player

Streaming media

Streaming protocols: RTP


WHAT IS TIME BASED MEDIA?

Any data that changes meaningfully with respect to time can be characterized as time-based media.

Audio clips, MIDI sequences, movie clips, and animations are common forms of time-based media.

Such media data can be obtained from a variety of sources, such as local or network files, cameras,microphones, and live broadcasts.


MEDIA PROCESSING MODEL


Media framework : its design goals

Java Media Framework (JMF) is a large and versatile API for manipulation and processing of time-based media in Java applications and applets.

This optional package which can capture,playback stream,transcode multimedia formats ,extends the java 2 standard edition for multimedia developers,by providing a powerful toolkit to develpop a scalable,cross plateform technology.


Architecture of jmf


Jmf architecture Managers

DataSources

Players

Processors

DataSinks


Managers JMF uses four managers:

Manager--handles the construction of Players, Processors, DataSources, and DataSinks. This level of indirection allows new implementations to be integrated seamlessly with JMF.

PackageManager--maintains a registry of packages that contain

JMF classes, such as custom Players, Processors, DataSources, and DataSinks.

CaptureDeviceManager--maintains a registry of available capture

devices. PlugInManager--maintains a registry of available JMF plug-in

processing components, such as Multiplexers, Demultiplexers, Codecs, Effects, and Renderers.


Managers..


Data Sources

JMF media players usually use DataSources to manage the transfer of media-content. A DataSource encapsulates both the location of media and the protocol and software used to deliver the media.

A DataSource is identified by either a JMF MediaLocator or a URL (universal resource locator).

JMF data sources can be categorized according to how data transfer is initiated:

Pull Data-Source--the client initiates the data transfer and controls the flow of data from pull data-sources.

Push Data-Source--the server initiates the data transfer and controls the flow of data from a push data-source. Push data-sources include broadcast media, multicast media, and video-on-demand (VOD).


Players

player Data

source

A Player processes an input stream of media data and renders it at a precise time. A DataSource is used to deliver the input media-stream to the Player.The rendering destination depends on the type of media being presented.


Processor

Specialized type of Player that provides control over processing performed on the input media stream


Processor stages


Processor stages..


Data Storage and Transmission

Data Sink is used to read data from a DataSource and render the media to an output destination.

Its typical actions are writing the data to a file across the network etc..


Simple applet movie player

Simple Java Applet that demonstrates how to create a simple media player with a media event listener. It will play the media clip right away and continuously loop.


Basic steps..

initialization

Retrieve applets FILE parameter

Use this to locate media file and build URL

Create Player using the Manager object

Register applet as a ControllerListener


Controlling the player Starting the Player

public void start() { if (player != null) player.realize(); } Stopping the Player public void stop() { if (player != null) { player.stop(); player.deallocate(); } }


Applet video player.. Player has methods to get references to

visual components

player.getVisualComponent()

player.getGainControl()

player.

getControlPanelComponent()


Extensibility

Jmf functionality can be extended in two ways:

Plug-ins Direct

implementations

codec

effect demux

mux

processor

Data source

Data sink player


Streaming media and Rtp When media content is streamed to a client in real-time, the client can

begin to play the stream without having to wait for the complete stream to download.

Transmitting media data across the net in real-time requires high network throughput.

Consequently, the protocols used for static data dont work well for streaming media.


Streaming protocols

TCP

http,ftp are based on tcp

Low bandwidth,

Slow streaming

UDP

Unreliable

slow

RTP

Dedicated for real time data transmission

High speed streaming


RTP architecture Real time transport protocol

Real time media frameworks and applications

Real time control protocol(RTCP) Real time transport protocol(RTP)

Other network and transport protocols(eg,tcp)

UDP

IP


RTP reception

An incoming rtp stream is handled by a session manager

The presentation of the stream is handled by a player

network Session manager

Data source

Data source

player

player


Rtp transmission

Data source

processor

Data source

Data source

Session manager

Data sink

network

file

file

Capture device

Session manager creates and sends streams for the content and control the transmission.


Conferencing :

sender server receiver

WEB CAM

JMF CAPTURE APPLET

UPLOAD THREAD

FILE UPLOAD SERVLET

JMF RECEIVER

APPLET

DIRECTORY OF FILE CLIPS


Queries?

java media framework presentation

Documents

transfer of media

data sources jmf media

broadcast media

multicast media

type of media

location of media

jmf data sources

input stream of media