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/*************************************************************************
This project implements a complete(!) JPEG (Recommendation ITU-T
T.81 | ISO/IEC 10918-1) codec, plus a library that can be used to
encode and decode JPEG streams.
It also implements ISO/IEC 18477 aka JPEG XT which is an extension
towards intermediate, high-dynamic-range lossy and lossless coding
of JPEG. In specific, it supports ISO/IEC 18477-3/-6/-7/-8 encoding.
Note that only Profiles C and D of ISO/IEC 18477-7 are supported
here. Check the JPEG XT reference software for a full implementation
of ISO/IEC 18477-7.
Copyright (C) 2012-2018 Thomas Richter, University of Stuttgart and
Accusoft. (C) 2019-2020 Thomas Richter, Fraunhofer IIS.
This program is available under two licenses, GPLv3 and the ITU
Software licence Annex A Option 2, RAND conditions.
For the full text of the GPU license option, see README.license.gpl.
For the full text of the ITU license option, see README.license.itu.
You may freely select between these two options.
For the GPL option, please note the following:
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*************************************************************************/
/*
** This class contains and maintains the AC conditioning
** parameters.
**
** $Id: actemplate.hpp,v 1.8 2014/09/30 08:33:16 thor Exp $
**
*/
#ifndef CODING_ACTEMPLATE_HPP
#define CODING_ACTEMPLATE_HPP
/// Includes
#include "tools/environment.hpp"
///
/// Forwards
class ByteStream;
///
/// ACTemplate
// This class contains and maintains the AC conditioning
// parameters.
#if ACCUSOFT_CODE
class ACTemplate : public JKeeper {
//
// The lower threshold, also known as 'L' parameter in the specs.
UBYTE m_ucLower;
//
// The upper threshold parameter, also known as 'U' parameter.
UBYTE m_ucUpper;
//
// The block index that discriminates between lower and upper
// block indices for AC coding.
UBYTE m_ucBlockEnd;
//
public:
ACTemplate(class Environ *env);
//
~ACTemplate(void);
//
// Parse off DC conditioning parameters.
void ParseDCMarker(class ByteStream *io);
//
// Parse off an AC conditioning parameter.
void ParseACMarker(class ByteStream *io);
//
// Just install the defaults found in the standard.
void InitDefaults(void);
//
// Return the largest block index that still counts
// as a lower index for AC coding. This is the kx parameter
UBYTE BandDiscriminatorOf(void) const
{
return m_ucBlockEnd;
}
//
// Return the L parameter.
UBYTE LowerThresholdOf(void) const
{
return m_ucLower;
}
//
// Return the U parameter.
UBYTE UpperThresholdOf(void) const
{
return m_ucUpper;
}
};
#endif
///
///
#endif
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