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

Class AbstractVideoPullBufferStream<T extends javax.media.protocol.PullBufferDataSource>

  • All Implemented Interfaces:
    javax.media.Controls, javax.media.protocol.Controls, javax.media.protocol.PullBufferStream, javax.media.protocol.SourceStream
    Direct Known Subclasses:
    ImageStream, IVFStream, RtpdumpStream, Video4Linux2Stream, VideoGreyFadingStream
    public abstract class AbstractVideoPullBufferStream<T extends javax.media.protocol.PullBufferDataSource>
extends AbstractPullBufferStream<T>
    Provides a base implementation of PullBufferStream for video in order to facilitate implementers by taking care of boilerplate in the most common cases.
    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 
      Modifier Constructor Description
      protected AbstractVideoPullBufferStream​(T dataSource, javax.media.control.FormatControl formatControl)
      Initializes a new AbstractVideoPullBufferStream instance which is to have its Format-related information abstracted by a specific FormatControl.

    • Method Summary

      All Methods Instance Methods Abstract 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 AbstractBufferStream as directly known by it.
      protected abstract void doRead​(javax.media.Buffer buffer)
      Blocks and reads into a Buffer from this PullBufferStream.
      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 read​(javax.media.Buffer buffer)
      Blocks and reads into a Buffer from this PullBufferStream.
      void start()
      Starts the transfer of media data from this AbstractBufferStream.
      void stop()
      Stops the transfer of media data from this AbstractBufferStream.

      • 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

      • AbstractVideoPullBufferStream

        protected AbstractVideoPullBufferStream​(T dataSource,
                                        javax.media.control.FormatControl formatControl)
        Initializes a new AbstractVideoPullBufferStream instance which is to have its Format-related information abstracted by a specific FormatControl.
        Parameters:
        dataSource - the PullBufferDataSource 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

      • doRead

        protected abstract void doRead​(javax.media.Buffer buffer)
                        throws IOException
        Blocks and reads into a Buffer from this PullBufferStream.
        Parameters:
        buffer - the Buffer this PullBufferStream is to read into
        Throws:
        IOException - if an I/O error occurs while this PullBufferStream reads into the specified Buffer

      • read

        public void read​(javax.media.Buffer buffer)
          throws IOException
        Blocks and reads into a Buffer from this PullBufferStream.
        Parameters:
        buffer - the Buffer this PullBufferStream is to read into
        Throws:
        IOException - if an I/O error occurs while this PullBufferStream reads into the specified Buffer

      • start

        public void start()
           throws IOException
        Starts the transfer of media data from this AbstractBufferStream.
        Throws:
        IOException - if anything goes wrong while starting the transfer of media data from this AbstractBufferStream
        See Also:
        AbstractBufferStream.start()

      • stop

        public void stop()
          throws IOException
        Stops the transfer of media data from this AbstractBufferStream.
        Throws:
        IOException - if anything goes wrong while stopping the transfer of media data from this AbstractBufferStream
        See Also:
        AbstractBufferStream.stop()

      • 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.

        Warning: The method is not invoked by the framework, extenders may choose to invoke it.

      • doGetFormat

        protected javax.media.Format doGetFormat()
        Gets the Format of this AbstractBufferStream as directly known by it. Allows extenders to override the Format known to the DataSource which created this instance and possibly provide more details on the currently set Format.
        Returns:
        the Format of this AbstractBufferStream as directly known by it or null if this AbstractBufferStream does not directly know its Format and it relies on the DataSource which created it to report its Format

      • 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