ptolemy.actor.lib.jmf
Class VideoCamera

java.lang.Object
  ptolemy.kernel.util.NamedObj
      ptolemy.kernel.InstantiableNamedObj
          ptolemy.kernel.Entity
              ptolemy.kernel.ComponentEntity
                  ptolemy.actor.AtomicActor
                      ptolemy.actor.TypedAtomicActor
                          ptolemy.actor.lib.Source
                              ptolemy.actor.lib.jmf.VideoCamera

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, javax.media.ControllerListener, Actor, Executable, FiringsRecordable, Initializable, TypedActor, Changeable, Debuggable, DebugListener, Derivable, Instantiable, ModelErrorHandler, MoMLExportable, Moveable, Nameable

public class VideoCamera
extends Source
implements javax.media.ControllerListener

An actor that produces a sequence of frames from a video camera. This actor requires the Java Media Framework, and has been tested at least with version 2.1.1. FIXME: more info.

Since:

Ptolemy II 3.0

Version:

$Id: VideoCamera.java 57040 2010-01-27 20:52:32Z cxh $

Author:

Christopher Hylands, Edward Lee, James Yeh, Paul Yang, David Lee

See Also:

Serialized Form

Accepted Rating:

Red

Proposed Rating:

Red

Nested Class Summary

class

VideoCamera.PreAccessCodec A pass-through codec to access to individual frames.

Nested classes/interfaces inherited from class ptolemy.kernel.Entity

Entity.ContainedObjectsIterator

Field Summary

private javax.media.Buffer	_bufferNew The java.awt.Image that we are producing/
private VideoCamera.PreAccessCodec	_cameraCodec
private javax.media.format.VideoFormat	_format
private javax.media.Buffer	_frameBuffer
private boolean	_newFrame
private javax.media.Processor	_processor The video processor.
private boolean	_stateTransitionOK
private java.lang.Object	_waitSync
Parameter	deviceNumber This parameter lets the user select the device to use.
StringAttribute	formatName The type of video format to use.

Fields inherited from class ptolemy.actor.lib.Source

output, trigger

Fields inherited from class ptolemy.actor.AtomicActor

_actorFiringListeners, _initializables, _notifyingActorFiring, _stopRequested

Fields inherited from class ptolemy.kernel.util.NamedObj

_changeListeners, _changeLock, _changeRequests, _debugging, _debugListeners, _elementName, _isPersistent, _verbose, _workspace, ATTRIBUTES, CLASSNAME, COMPLETE, CONTENTS, DEEP, FULLNAME, LINKS

Fields inherited from interface ptolemy.actor.Executable

COMPLETED, NOT_READY, STOP_ITERATING

Constructor Summary

VideoCamera(CompositeEntity container, java.lang.String name)
Construct an actor with the given container and name.

Method Summary

protected boolean	_waitForState(int state) Block until the processor has transitioned to the given state.
void	controllerUpdate(javax.media.ControllerEvent evt) Controller Listener.
void	fire() Capture a frame and send a java.awt.Image object to the output port.
void	initialize() Open the file at the URL, and set the width of the output.
void	wrapup() Close the media processor.

Methods inherited from class ptolemy.actor.lib.Source

prefire

Methods inherited from class ptolemy.actor.TypedAtomicActor

_addPort, _fireAt, _fireAt, attributeTypeChanged, clone, newPort, typeConstraintList, typeConstraints

Methods inherited from class ptolemy.actor.AtomicActor

_actorFiring, _actorFiring, addActorFiringListener, addInitializable, clone, connectionsChanged, createReceivers, declareDelayDependency, getCausalityInterface, getDirector, getExecutiveDirector, getManager, inputPortList, isFireFunctional, isStrict, iterate, newReceiver, outputPortList, postfire, preinitialize, pruneDependencies, recordFiring, removeActorFiringListener, removeDependency, removeInitializable, setContainer, stop, stopFire, terminate

Methods inherited from class ptolemy.kernel.ComponentEntity

_adjustDeferrals, _checkContainer, _getContainedObject, _propagateExistence, getContainer, instantiate, isAtomic, isOpaque, moveDown, moveToFirst, moveToIndex, moveToLast, moveUp, propagateExistence, setName

Methods inherited from class ptolemy.kernel.Entity

_description, _exportMoMLContents, _removePort, _validateSettables, connectedPortList, connectedPorts, containedObjectsIterator, getAttribute, getPort, getPorts, linkedRelationList, linkedRelations, portList, removeAllPorts, setClassDefinition, uniqueName

Methods inherited from class ptolemy.kernel.InstantiableNamedObj

_setParent, exportMoML, getChildren, getElementName, getParent, getPrototypeList, isClassDefinition, isWithinClassDefinition

Methods inherited from class ptolemy.kernel.util.NamedObj

_addAttribute, _adjustOverride, _attachText, _cloneFixAttributeFields, _debug, _debug, _debug, _debug, _debug, _getIndentPrefix, _isMoMLSuppressed, _markContentsDerived, _propagateValue, _recordDecoratedAttributes, _removeAttribute, _splitName, _stripNumericSuffix, addChangeListener, addDebugListener, attributeChanged, attributeList, attributeList, deepContains, depthInHierarchy, description, description, event, executeChangeRequests, exportMoML, exportMoML, exportMoML, exportMoML, exportMoMLPlain, getAttribute, getAttributes, getChangeListeners, getClassName, getDecoratorAttribute, getDecoratorAttributes, getDerivedLevel, getDerivedList, getDisplayName, getFullName, getModelErrorHandler, getName, getName, getSource, handleModelError, isDeferringChangeRequests, isOverridden, isPersistent, lazyContainedObjectsIterator, message, propagateValue, propagateValues, removeChangeListener, removeDebugListener, requestChange, setClassName, setDeferringChangeRequests, setDerivedLevel, setDisplayName, setModelErrorHandler, setPersistent, setSource, sortContainedObjects, toplevel, toString, validateSettables, workspace

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface ptolemy.actor.Actor

createReceivers, getCausalityInterface, getDirector, getExecutiveDirector, getManager, inputPortList, newReceiver, outputPortList

Methods inherited from interface ptolemy.actor.Executable

isFireFunctional, isStrict, iterate, postfire, stop, stopFire, terminate

Methods inherited from interface ptolemy.actor.Initializable

addInitializable, preinitialize, removeInitializable

Methods inherited from interface ptolemy.kernel.util.Nameable

description, getContainer, getDisplayName, getFullName, getName, getName, setName

Methods inherited from interface ptolemy.kernel.util.Derivable

getDerivedLevel, getDerivedList, propagateValue

Field Detail

formatName

public StringAttribute formatName

The type of video format to use. This is a string valued attribute that defaults to the type RGB.

deviceNumber

public Parameter deviceNumber

This parameter lets the user select the device to use. Typically this parameter is of no concern and should be left at 0. However, if a computer has more than one usable cameras, this parameter can be used to choose amongst them.

_format

private javax.media.format.VideoFormat _format

_bufferNew

private javax.media.Buffer _bufferNew

The java.awt.Image that we are producing/

_newFrame

private boolean _newFrame

_processor

private javax.media.Processor _processor

The video processor.

_cameraCodec

private VideoCamera.PreAccessCodec _cameraCodec

_waitSync

private java.lang.Object _waitSync

_stateTransitionOK

private boolean _stateTransitionOK

_frameBuffer

private javax.media.Buffer _frameBuffer

Constructor Detail

VideoCamera

public VideoCamera(CompositeEntity container,
                   java.lang.String name)
            throws IllegalActionException,
                   NameDuplicationException

Construct an actor with the given container and name.

Parameters:

container - The container.

name - The name of this actor.

Throws:

IllegalActionException - If the actor cannot be contained by the proposed container.

NameDuplicationException - If the container already has an actor with this name.

Method Detail

controllerUpdate

public void controllerUpdate(javax.media.ControllerEvent evt)

Controller Listener.

Specified by:

controllerUpdate in interface javax.media.ControllerListener

fire

public void fire()
          throws IllegalActionException

Capture a frame and send a java.awt.Image object to the output port.

Specified by:

fire in interface Executable

Overrides:

fire in class Source

Throws:

IllegalActionException - If there's no director.

initialize

public void initialize()
                throws IllegalActionException

Open the file at the URL, and set the width of the output.

Specified by:

initialize in interface Initializable

Overrides:

initialize in class AtomicActor

Throws:

IllegalActionException - If there are no video capture devices.

wrapup

public void wrapup()

Close the media processor.

Specified by:

wrapup in interface Initializable

Overrides:

wrapup in class AtomicActor

_waitForState

protected boolean _waitForState(int state)

Block until the processor has transitioned to the given state. Return false if the transition failed.

Parameters:

state - The state for which we are waiting.

Returns:

True if the state transition is ok, otherwise return false.