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/*
* $RCSfile: CodedCBlkDataSrcDec.java,v $
* $Revision: 1.1 $
* $Date: 2005/02/11 05:02:06 $
* $State: Exp $
*
* Class: CodedCBlkDataSrcDec
*
* Description: Interface that defines a source of entropy coded
* data that is transferred in a code-block by
* code-block basis (decoder side).
*
*
*
* COPYRIGHT:
*
* This software module was originally developed by Raphaël Grosbois and
* Diego Santa Cruz (Swiss Federal Institute of Technology-EPFL); Joel
* Askelöf (Ericsson Radio Systems AB); and Bertrand Berthelot, David
* Bouchard, Félix Henry, Gerard Mozelle and Patrice Onno (Canon Research
* Centre France S.A) in the course of development of the JPEG2000
* standard as specified by ISO/IEC 15444 (JPEG 2000 Standard). This
* software module is an implementation of a part of the JPEG 2000
* Standard. Swiss Federal Institute of Technology-EPFL, Ericsson Radio
* Systems AB and Canon Research Centre France S.A (collectively JJ2000
* Partners) agree not to assert against ISO/IEC and users of the JPEG
* 2000 Standard (Users) any of their rights under the copyright, not
* including other intellectual property rights, for this software module
* with respect to the usage by ISO/IEC and Users of this software module
* or modifications thereof for use in hardware or software products
* claiming conformance to the JPEG 2000 Standard. Those intending to use
* this software module in hardware or software products are advised that
* their use may infringe existing patents. The original developers of
* this software module, JJ2000 Partners and ISO/IEC assume no liability
* for use of this software module or modifications thereof. No license
* or right to this software module is granted for non JPEG 2000 Standard
* conforming products. JJ2000 Partners have full right to use this
* software module for his/her own purpose, assign or donate this
* software module to any third party and to inhibit third parties from
* using this software module for non JPEG 2000 Standard conforming
* products. This copyright notice must be included in all copies or
* derivative works of this software module.
*
* Copyright (c) 1999/2000 JJ2000 Partners.
* */
package jj2000.j2k.entropy.decoder;
import jj2000.j2k.wavelet.synthesis.InvWTData;
import jj2000.j2k.wavelet.synthesis.SubbandSyn;
/**
* This interface defines a source of entropy coded data and methods to
* transfer it in a code-block by code-block basis. In each call to
* 'geCodeBlock()' a specified coded code-block is returned.
*
* This interface is the source of data for the entropy decoder. See the
* 'EntropyDecoder' class.
*
*
For each coded-code-block the entropy-coded data is returned along with
* its truncation point information in a 'DecLyrdCBlk' object.
*
* @see EntropyDecoder
*
* @see DecLyrdCBlk
*
* @see jj2000.j2k.codestream.reader.BitstreamReaderAgent
* */
public interface CodedCBlkDataSrcDec extends InvWTData {
/**
* Returns the specified coded code-block, for the specified component, in
* the current tile. The first layer to return is indicated by 'fl'. The
* number of layers that is returned depends on 'nl' and the amount of
* data available.
*
*
The argument 'fl' is to be used by subsequent calls to this method
* for the same code-block. In this way supplamental data can be retrieved
* at a later time. The fact that data from more than one layer can be
* returned means that several packets from the same code-block, of the
* same component, and the same tile, have been concatenated.
*
*
The returned compressed code-block can have its progressive
* attribute set. If this attribute is set it means that more data can be
* obtained by subsequent calls to this method (subject to transmission
* delays, etc). If the progressive attribute is not set it means that the
* returned data is all the data that can be obtained for the specified
* subblock.
*
*
The compressed code-block is uniquely specified by the current tile,
* the component (identified by 'c'), the subband (indentified by 'sb')
* and the code-bock vertical and horizontal indexes 'm' and 'n'.
*
*
The 'ulx' and 'uly' members of the returned 'DecLyrdCBlk' object
* contain the coordinates of the top-left corner of the block, with
* respect to the tile, not the subband.
*
* @param c The index of the component, from 0 to N-1.
*
* @param m The vertical index of the code-block to return, in the
* specified subband.
*
* @param n The horizontal index of the code-block to return, in the
* specified subband.
*
* @param sb The subband in whic the requested code-block is.
*
* @param fl The first layer to return.
*
* @param nl The number of layers to return, if negative all available
* layers are returned, starting at 'fl'.
*
* @param ccb If not null this object is used to return the compressed
* code-block. If null a new object is created and returned. If the data
* array in ccb is not null then it can be reused to return the compressed
* data.
*
* @return The compressed code-block, with a certain number of layers
* determined by the available data and 'nl'.
* */
public DecLyrdCBlk getCodeBlock(int c, int m, int n,
SubbandSyn sb, int fl, int nl,
DecLyrdCBlk ccb);
}