org.jitsi.impl.neomedia.jmfext.media.protocol.video4linux2

Class Video4Linux2Stream

java.lang.Object

org.jitsi.impl.neomedia.control.AbstractControls

org.jitsi.impl.neomedia.jmfext.media.protocol.AbstractPullBufferStream<T>

org.jitsi.impl.neomedia.jmfext.media.protocol.AbstractVideoPullBufferStream<DataSource>

org.jitsi.impl.neomedia.jmfext.media.protocol.video4linux2.Video4Linux2Stream

All Implemented Interfaces:

javax.media.Controls, javax.media.protocol.PullBufferStream, javax.media.protocol.SourceStream

public class Video4Linux2Stream
extends AbstractVideoPullBufferStream<DataSource>

Implements a PullBufferStream using the Video for Linux Two API Specification.

Author:

Lyubomir Marinov

Field Summary

Fields

Modifier and Type	Field and Description
protected T	dataSource The DataSource which has created this instance and which contains it as one of its streams.
protected javax.media.control.FormatControl	formatControl The FormatControl which gives access to the Format of the media data provided by this SourceStream and which, optionally, allows setting it.

Fields inherited from interface javax.media.protocol.SourceStream

LENGTH_UNKNOWN

Constructor Summary

Constructors

Constructor and Description
Video4Linux2Stream(DataSource dataSource, javax.media.control.FormatControl formatControl) Initializes a new Video4Linux2Stream instance which is to have its Format-related information abstracted by a specific FormatControl.

Method Summary

Modifier and Type	Method and Description
void	close() Releases the resources used by this instance throughout its existence and makes it available for garbage collection.
protected javax.media.Format	doGetFormat() Gets the Format of this PullBufferStream as directly known by it.
protected void	doRead(javax.media.Buffer buffer) Reads media data from this PullBufferStream into a specific Buffer with blocking.
protected javax.media.Format	doSetFormat(javax.media.Format format) Attempts to set the Format of this AbstractBufferStream.
boolean	endOfStream() Determines whether the end of this SourceStream has been reached.
javax.media.protocol.ContentDescriptor	getContentDescriptor() Gets a ContentDescriptor which describes the type of the content made available by this SourceStream.
long	getContentLength() Gets the length in bytes of the content made available by this SourceStream.
Object[]	getControls() Implements Controls.getControls().
javax.media.Format	getFormat() Gets the Format of the media data made available by this AbstractBufferStream.
void	start() Starts the transfer of media data from this PullBufferStream.
void	stop() Stops the transfer of media data from this PullBufferStream.

Methods inherited from class org.jitsi.impl.neomedia.jmfext.media.protocol.AbstractVideoPullBufferStream

read

Methods inherited from class org.jitsi.impl.neomedia.jmfext.media.protocol.AbstractPullBufferStream

willReadBlock

Methods inherited from class org.jitsi.impl.neomedia.control.AbstractControls

getControl, getControl, queryInterface, queryInterface

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.media.protocol.PullBufferStream

getFormat

Methods inherited from interface javax.media.protocol.SourceStream

endOfStream, getContentDescriptor, getContentLength

Methods inherited from interface javax.media.Controls

getControl, getControls

Field Detail

dataSource

protected final T extends javax.media.protocol.DataSource dataSource

The DataSource which has created this instance and which contains it as one of its streams.

formatControl

protected final javax.media.control.FormatControl formatControl

The FormatControl which gives access to the Format of the media data provided by this SourceStream and which, optionally, allows setting it.

Constructor Detail

Video4Linux2Stream

public Video4Linux2Stream(DataSource dataSource,
                          javax.media.control.FormatControl formatControl)

Initializes a new Video4Linux2Stream instance which is to have its Format-related information abstracted by a specific FormatControl.

Parameters:

dataSource - the DataSource which is creating the new instance so that it becomes one of its streams

formatControl - the FormatControl which is to abstract the Format-related information of the new instance

Method Detail

close

public void close()

Releases the resources used by this instance throughout its existence and makes it available for garbage collection. This instance is considered unusable after closing.

See Also:

AbstractBufferStream.close()

doGetFormat

protected javax.media.Format doGetFormat()

Gets the Format of this PullBufferStream as directly known by it.

Returns:

the Format of this PullBufferStream as directly known by it or null if this PullBufferStream does not directly know its Format and it relies on the PullBufferDataSource which created it to report its Format

See Also:

AbstractBufferStream.doGetFormat()

doRead

protected void doRead(javax.media.Buffer buffer)
               throws IOException

Reads media data from this PullBufferStream into a specific Buffer with blocking.

Specified by:

doRead in class AbstractVideoPullBufferStream<DataSource>

Parameters:

buffer - the Buffer in which media data is to be read from this PullBufferStream

Throws:

IOException - if anything goes wrong while reading media data from this PullBufferStream into the specified buffer

See Also:

AbstractVideoPullBufferStream.doRead(Buffer)

start

public void start()
           throws IOException

Starts the transfer of media data from this PullBufferStream.

Overrides:

start in class AbstractVideoPullBufferStream<DataSource>

Throws:

IOException - if anything goes wrong while starting the transfer of media data from this PullBufferStream

See Also:

AbstractBufferStream.start()

stop

public void stop()
          throws IOException

Stops the transfer of media data from this PullBufferStream.

Overrides:

stop in class AbstractVideoPullBufferStream<DataSource>

Throws:

IOException - if anything goes wrong while stopping the transfer of media data from this PullBufferStream

See Also:

AbstractBufferStream.stop()

doSetFormat

protected javax.media.Format doSetFormat(javax.media.Format format)

Attempts to set the Format of this AbstractBufferStream. Allows extenders to enable setting the Format of an existing AbstractBufferStream (in contract to setting it before the AbstractBufferStream is created by the DataSource which will provide it).

Parameters:

format - the Format to be set as the format of this AbstractBufferStream

Returns:

the Format of this AbstractBufferStream or null if the attempt to set the Format did not succeed and any last-known Format is to be left in effect

endOfStream

public boolean endOfStream()

Determines whether the end of this SourceStream has been reached. The AbstractBufferStream implementation always returns false.

Specified by:

endOfStream in interface javax.media.protocol.SourceStream

Returns:

true if the end of this SourceStream has been reached; otherwise, false

getContentDescriptor

public javax.media.protocol.ContentDescriptor getContentDescriptor()

Gets a ContentDescriptor which describes the type of the content made available by this SourceStream. The AbstractBufferStream implementation always returns a ContentDescriptor with content type equal to ContentDescriptor#RAW.

Specified by:

getContentDescriptor in interface javax.media.protocol.SourceStream

Returns:

a ContentDescriptor which describes the type of the content made available by this SourceStream

getContentLength

public long getContentLength()

Gets the length in bytes of the content made available by this SourceStream. The AbstractBufferStream implementation always returns LENGTH_UNKNOWN.

Specified by:

getContentLength in interface javax.media.protocol.SourceStream

Returns:

the length in bytes of the content made available by this SourceStream if it is known; otherwise, LENGTH_UKNOWN

getControls

public Object[] getControls()

Implements Controls.getControls(). Gets the controls available for this instance.

Specified by:

getControls in interface javax.media.Controls

Returns:

an array of Objects which represent the controls available for this instance

getFormat

public javax.media.Format getFormat()

Gets the Format of the media data made available by this AbstractBufferStream.

Returns:

the Format of the media data made available by this AbstractBufferStream