fi.helsinki.cs.ohtu.mpeg2
Class SystemHeader

java.lang.Object
  fi.helsinki.cs.ohtu.mpeg2.SystemHeader

public class SystemHeader
extends java.lang.Object

Represents the system header in program streams.

Nested Class Summary

private static class

SystemHeader.StreamInfo

Field Summary

private int	audioBound
private boolean	audioLocked
private boolean	fixedRate
private int	rateBound
private java.util.HashMap<StreamID,SystemHeader.StreamInfo>	streams
private int	videoBound
private boolean	videoLocked

Constructor Summary

SystemHeader(int rateBound, int audioBound, int videoBound)
Creates a new instance of class SystemHeader.

SystemHeader(int rateBound, int audioBound, int videoBound, boolean fixedRate, boolean audioLocked, boolean videoLocked)
Creates a new instance of class SystemHeader.

Method Summary

void	addStream(StreamID sid, boolean pstdScale, int pstdBufBound)
void	addStream(StreamID sid, int bufSize)
int	getAudioBound() Gets the maximum number of simultaneously decoding audio streams.
int	getHeaderLength() Returns the length of this SystemHeader, in bytes.
int	getRateBound() Gets the value of the rate bound.
int	getStreamBufferSize(StreamID sid)
int	getVideoBound() Gets the maximum number of simultaneously decoding video streams.
boolean	isAudioLocked() Gets the value of the audio locked flag.
boolean	isFixedRate() Gets the value of the fixed rate flag.
boolean	isVideoLocked() Gets the value of the video locked flag.
void	removeStream(StreamID sid)
void	setAudioBound(int audioBound) Sets the maximum number of audio streams for which the decoding processes are simultaneously active.
void	setAudioLocked(boolean audioLocked) Sets the audio locked flag.
void	setFixedRate(boolean fixedRate) Sets the fixed rate flag.
void	setRateBound(int rateBound) Sets the maximum expected value of program mux rate.
void	setVideoBound(int videoBound) Sets the maximum number of video streams for which the decoding processes are simultaneously active.
void	setVideoLocked(boolean videoLocked) Sets the video locked flag.
void	writeTo(BitOutputStream stream) Writes this System Header to stream stream.

Methods inherited from class java.lang.Object

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

Field Detail

rateBound

private int rateBound

videoBound

private int videoBound

audioBound

private int audioBound

fixedRate

private boolean fixedRate

audioLocked

private boolean audioLocked

videoLocked

private boolean videoLocked

streams

private java.util.HashMap<StreamID,SystemHeader.StreamInfo> streams

Constructor Detail

SystemHeader

public SystemHeader(int rateBound,
                    int audioBound,
                    int videoBound,
                    boolean fixedRate,
                    boolean audioLocked,
                    boolean videoLocked)

Creates a new instance of class SystemHeader.

Parameters:

rateBound - Rate bound

audioBound - Audio bound

videoBound - Video bound

See Also:

setRateBound(int), setAudioBound(int), setVideoBound(int), setFixedRate(boolean), setAudioLocked(boolean), setVideoLocked(boolean)

SystemHeader

public SystemHeader(int rateBound,
                    int audioBound,
                    int videoBound)

Creates a new instance of class SystemHeader. The fixed rate, audio locked and video locked flags are not set.

See Also:

SystemHeader(int, int, int, boolean, boolean, boolean)

Method Detail

getRateBound

public int getRateBound()

Gets the value of the rate bound.

Returns:

Value of the rate bound

getAudioBound

public int getAudioBound()

Gets the maximum number of simultaneously decoding audio streams.

Returns:

The maximum number of simultaneously deconding audio streams

getVideoBound

public int getVideoBound()

Gets the maximum number of simultaneously decoding video streams.

Returns:

The maximum number of simultaneously deconding video streams

isFixedRate

public boolean isFixedRate()

Gets the value of the fixed rate flag.

Returns:

Value of the fixed rate flag

isAudioLocked

public boolean isAudioLocked()

Gets the value of the audio locked flag.

Returns:

Value of the audio locked flag

isVideoLocked

public boolean isVideoLocked()

Gets the value of the video locked flag.

Returns:

Value of the video locked flag

setFixedRate

public void setFixedRate(boolean fixedRate)

Sets the fixed rate flag.

Parameters:

fixedRate - true if the rate is fixed; false otherwise

setAudioLocked

public void setAudioLocked(boolean audioLocked)

Sets the audio locked flag.

Parameters:

audioLocked - true if the audio sampling rate is locked to the system clock; false otherwise

setVideoLocked

public void setVideoLocked(boolean videoLocked)

Sets the video locked flag.

Parameters:

videoLocked - true if the video frame rate is locked to the system clock; false otherwise

setRateBound

public void setRateBound(int rateBound)

Sets the maximum expected value of program mux rate.

Parameters:

rateBound - Rate bound, in the range from 0 to 2**22 - 1

setAudioBound

public void setAudioBound(int audioBound)

Sets the maximum number of audio streams for which the decoding processes are simultaneously active.

Parameters:

audioBound - Audio bound, in the range from 0 to 32

setVideoBound

public void setVideoBound(int videoBound)

Sets the maximum number of video streams for which the decoding processes are simultaneously active.

Parameters:

videoBound - Video bound, in the range from 0 to 16

addStream

public void addStream(StreamID sid,
                      boolean pstdScale,
                      int pstdBufBound)

addStream

public void addStream(StreamID sid,
                      int bufSize)

removeStream

public void removeStream(StreamID sid)

getStreamBufferSize

public int getStreamBufferSize(StreamID sid)

writeTo

public void writeTo(BitOutputStream stream)
             throws java.io.IOException

Writes this System Header to stream stream.

Parameters:

stream - Stream to write this header to

Throws:

java.io.IOException

getHeaderLength

public int getHeaderLength()

Returns the length of this SystemHeader, in bytes.

Returns:

the length in bytes