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

Class Video4Linux2Stream

  • All Implemented Interfaces:
    javax.media.Controls, javax.media.protocol.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 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 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

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method 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 interface javax.media.Controls

        getControl, getControls

      • Methods inherited from interface javax.media.protocol.PullBufferStream

        getFormat

      • Methods inherited from interface javax.media.protocol.SourceStream

        endOfStream, getContentDescriptor, getContentLength

    • 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()

      • 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