CADI.Common.LogicalTarget.JPEG2000.Codestream
Class JPCMainHeaderDecoder

java.lang.Object
  CADI.Common.LogicalTarget.JPEG2000.Codestream.JPCMainHeaderDecoder

public class JPCMainHeaderDecoder
extends java.lang.Object

This class reads the JPEG2000 code-stream main header and decodes it. An input stream object is passed to, and it reads the global information neccesary to decompress the image.

Version:

1.1.3 2008/11/16

Author:

Group on Interactive Coding of Images (GICI)

Field Summary

(package private) int[]	definedPrecincts Tells if precincts are defined within the headers or not (1 or 0).
private BufferedDataInputStream	in Is an object with the input stream where the main header is read from.
private JPCParameters	jpcParameters Is an object where the main header are saved.
private long	mainHeaderInitialPos Is the file pointer to the first byte of the main header.
private int	mainHeaderLength Is the length of the main header.
(package private) boolean	markerFound To know if a marker has been found.

Constructor Summary

JPCMainHeaderDecoder(BufferedDataInputStream in)

Method Summary

JPCParameters	getJPCParameters() This function returns the JPC codestream parameters.
long	getMainHeaderInitialPos() Returns the first position of the main header first byte in the image codestream.
int	getMainHeaderLength() Returns the length of the main header.
private void	readCBD()
private void	readCOC() Reads a COD/COC marker segment and retrieves the parameters contained.
private void	readCOD() Reads a COD marker segment and retrieves the parameters contained.
void	readCOM()
private void	readMCC() Reads the MCC marker.
private void	readMCO() Reads the MCO marker.
private void	readMCT()
private void	readQCC() Reads a QCD/QCC marker segment and retrieves the parameters contained.
private void	readQCD() Reads a QCD/QCC marker segment and retrieves the parameters contained.
private void	readSIZ() Reads the SIZ marker segment and retrieves the parameters contained.
private void	readSOC() Reads the SOC marker.
void	run() Reads the J2C file headers and retrieves the parameters contained.

Methods inherited from class java.lang.Object

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

Field Detail

in

private BufferedDataInputStream in

Is an object with the input stream where the main header is read from.

jpcParameters

private JPCParameters jpcParameters

Is an object where the main header are saved.

mainHeaderInitialPos

private long mainHeaderInitialPos

Is the file pointer to the first byte of the main header.

mainHeaderLength

private int mainHeaderLength

Is the length of the main header.

definedPrecincts

int[] definedPrecincts

Tells if precincts are defined within the headers or not (1 or 0).

Index in the array is component index

markerFound

boolean markerFound

To know if a marker has been found.

Constructor Detail

JPCMainHeaderDecoder

public JPCMainHeaderDecoder(BufferedDataInputStream in)

Parameters:

in -

Method Detail

run

public void run()
         throws ErrorException

Reads the J2C file headers and retrieves the parameters contained.

Throws:

ErrorException - when the header information is ambiguous or incorrect

getMainHeaderInitialPos

public long getMainHeaderInitialPos()

Returns the first position of the main header first byte in the image codestream.

Returns:

The position of the main header first byte.

getMainHeaderLength

public int getMainHeaderLength()

Returns the length of the main header.

Returns:

The length of the main header.

getJPCParameters

public JPCParameters getJPCParameters()

This function returns the JPC codestream parameters.

Returns:

jpcParameters definition in JPCParameters

readSOC

private void readSOC()
              throws ErrorException,
                     java.io.IOException

Reads the SOC marker.

Throws:

ErrorException - when the SOC marker is not unique in the codestream

java.io.IOException

readSIZ

private void readSIZ()
              throws ErrorException,
                     java.io.IOException

Reads the SIZ marker segment and retrieves the parameters contained.

Throws:

ErrorException - when the SIZ marker or its marker segment is ambiguous or incorrect

java.io.IOException

readCOD

private void readCOD()
              throws ErrorException,
                     java.io.IOException

Reads a COD marker segment and retrieves the parameters contained.

Throws:

ErrorException - when the COD marker segment is ambiguous or incorrect

java.io.IOException

readCOC

private void readCOC()
              throws ErrorException,
                     java.io.IOException

Reads a COD/COC marker segment and retrieves the parameters contained.

Throws:

ErrorException - when the COD/COC marker segment is ambiguous or incorrect

java.io.IOException

readQCD

private void readQCD()
              throws ErrorException,
                     java.io.IOException

Reads a QCD/QCC marker segment and retrieves the parameters contained.

Throws:

ErrorException - when the QCD/QCC marker segment is ambiguous or incorrect

java.io.IOException

readQCC

private void readQCC()
              throws ErrorException,
                     java.io.IOException

Reads a QCD/QCC marker segment and retrieves the parameters contained.

Throws:

ErrorException - when the QCD/QCC marker segment is ambiguous or incorrect

java.io.IOException

readCOM

public void readCOM()
             throws ErrorException,
                    java.io.IOException

Throws:

ErrorException

java.io.IOException

readCBD

private void readCBD()
              throws ErrorException,
                     java.io.IOException

Throws:

ErrorException

java.io.IOException

readMCT

private void readMCT()
              throws ErrorException,
                     java.io.IOException

Throws:

ErrorException

java.io.IOException

readMCC

private void readMCC()
              throws ErrorException,
                     java.io.IOException

Reads the MCC marker.

Throws:

ErrorException

java.io.IOException

readMCO

private void readMCO()
              throws ErrorException,
                     java.io.IOException

Reads the MCO marker.

Throws:

ErrorException

java.io.IOException