org.mobicents.media.server.impl.resource.mediaplayer.mpeg
Class TrackHeaderBox

java.lang.Object
  org.mobicents.media.server.impl.resource.mediaplayer.mpeg.Box
      org.mobicents.media.server.impl.resource.mediaplayer.mpeg.FullBox
          org.mobicents.media.server.impl.resource.mediaplayer.mpeg.TrackHeaderBox

public class TrackHeaderBox
extends FullBox

8.3.2.1 Definition

• Box Type: �?tkhd’
• Container: TrackBox (�?trak’)
• Mandatory: Yes
• Quantity: Exactly one

This box specifies the characteristics of a single track. Exactly one Track Header Box is contained in a track. In the absence of an edit list, the presentation of a track starts at the beginning of the overall presentation. An empty edit is used to offset the start time of a track.

The default value of the track header flags for media tracks is 7 (track_enabled, track_in_movie, track_in_preview). If in a presentation all tracks have neither track_in_movie nor track_in_preview set, then all tracks shall be treated as if both flags were set on all tracks. Hint tracks should have the track header flags set to 0, so that they are ignored for local playback and preview.

The width and height in the track header are measured on a notional �?square’ (uniform) grid. Track video data is normalized to these dimensions (logically) before any transformation or placement caused by a layup or composition system. Track (and movie) matrices, if used, also operate in this uniformly-scaled space.

Author:

kulikov, amit bhayani

Field Summary

Fields inherited from class org.mobicents.media.server.impl.resource.mediaplayer.mpeg.Box

bytetoTypeMap

Constructor Summary

TrackHeaderBox(long size)

Method Summary

int	getAlternateGroup()
long	getCreationTime()
long	getDuration()
double	getHeight()
int	getLayer()
int[]	getMatrix()
long	getModificationTime()
long	getTrackID()
float	getVolume()
double	getWidth()
protected int	load(java.io.DataInputStream fin) Loads Box from stream.

Methods inherited from class org.mobicents.media.server.impl.resource.mediaplayer.mpeg.FullBox

getFlags, getVersion, read64

Methods inherited from class org.mobicents.media.server.impl.resource.mediaplayer.mpeg.Box

comparebytes, getSize, getType, read, read16, read24, read32, readFixedPoint1616, readText, readType, readU32, readU64

Methods inherited from class java.lang.Object

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

Constructor Detail

TrackHeaderBox

public TrackHeaderBox(long size)

Method Detail

load

protected int load(java.io.DataInputStream fin)
            throws java.io.IOException

Description copied from class: Box

Loads Box from stream.

Overrides:

load in class FullBox

Parameters:

fin - the stream to load box from

Returns:

the number of bytes readed from stream; *

Throws:

java.io.IOException - if some I/O error occured.

getCreationTime

public long getCreationTime()

getModificationTime

public long getModificationTime()

getDuration

public long getDuration()

getTrackID

public long getTrackID()

getLayer

public int getLayer()

getAlternateGroup

public int getAlternateGroup()

getVolume

public float getVolume()

getMatrix

public int[] getMatrix()

getWidth

public double getWidth()

getHeight

public double getHeight()