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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
** parameter templates.
**
** $Id: actable.cpp,v 1.12 2017/06/06 10:51:41 thor Exp $
**
*/
/// Includes
#include "marker/actable.hpp"
#include "io/bytestream.hpp"
#include "coding/actemplate.hpp"
#include "std/string.hpp"
///
/// ACTable::ACTable
ACTable::ACTable(class Environ *env)
: JKeeper(env)
{
#if ACCUSOFT_CODE
memset(m_pParameters,0,sizeof(m_pParameters));
#endif
}
///
/// ACTable::~ACTable
ACTable::~ACTable(void)
{
#if ACCUSOFT_CODE
int i;
for(i = 0;i < 8;i++) {
delete m_pParameters[i];
}
#endif
}
///
/// ACTable::WriteMarker
// Write the currently defined huffman tables back to a stream.
void ACTable::WriteMarker(class ByteStream *io)
{
#if ACCUSOFT_CODE
int i = 0;
ULONG len = 2; // marker size itself.
for(i = 0;i < 8;i++) {
if (m_pParameters[i]) {
len += 2;
}
}
if (len > MAX_UWORD)
JPG_THROW(OVERFLOW_PARAMETER,"ACTable::WriteMarker","DAC marker overhead too large");
io->PutWord(len);
for(i = 0;i < 8;i++) {
if (m_pParameters[i]) {
if (i >= 4) {
io->Put(0x10 | (i & 0x03)); // AC table.
io->Put(m_pParameters[i]->BandDiscriminatorOf());
} else {
io->Put(i & 0x03); // DC table.
io->Put((m_pParameters[i]->UpperThresholdOf() << 4) | m_pParameters[i]->LowerThresholdOf());
}
}
}
#else
NOREF(io);
JPG_THROW(NOT_IMPLEMENTED,"ACTable::WriteMarker",
"Arithmetic coding option not available in your code release, please contact Accusoft for a full version");
#endif
}
///
/// ACTable::ParseMarker
// Parse the marker contents of a DHT marker.
void ACTable::ParseMarker(class ByteStream *io)
{
#if ACCUSOFT_CODE
LONG len = io->GetWord();
if (len < 2)
JPG_THROW(MALFORMED_STREAM,"ACTable::ParseMarker","AC conditioning table length must be at least two bytes long");
len -= 2; // remove the marker length.
while(len > 0) {
LONG t = io->Get();
if (t == ByteStream::EOF)
JPG_THROW(MALFORMED_STREAM,"ACTable::ParseMarker","AC conditioning table marker run out of data");
len--;
if ((t >> 4) > 1) {
JPG_THROW(MALFORMED_STREAM,"ACTable::ParseMarker","undefined conditioning table type");
return;
}
t = (t & 0x03) | ((t & 0xf0) >> 2);
delete m_pParameters[t];m_pParameters[t] = NULL;
m_pParameters[t] = new(m_pEnviron) ACTemplate(m_pEnviron);
if (t >= 4)
m_pParameters[t]->ParseACMarker(io);
else
m_pParameters[t]->ParseDCMarker(io);
len--;
}
#else
NOREF(io);
JPG_THROW(NOT_IMPLEMENTED,"ACTable::WriteMarker",
"Arithmetic coding option not available in your code release, please contact Accusoft for a full version");
#endif
}
///
/// ACTable::DCTemplateOf
// Get the template for the indicated DC table or NULL if it doesn't exist.
class ACTemplate *ACTable::DCTemplateOf(UBYTE idx,ScanType,UBYTE,UBYTE,UBYTE)
{
#if ACCUSOFT_CODE
assert(m_pParameters && idx < 4);
if (m_pParameters[idx] == NULL) {
m_pParameters[idx] = new(m_pEnviron) class ACTemplate(m_pEnviron);
m_pParameters[idx]->InitDefaults();
}
return m_pParameters[idx];
#else
NOREF(idx);
return NULL;
#endif
}
///
/// ACTable::ACTemplateOf
// Get the template for the indicated AC table or NULL if it doesn't exist.
class ACTemplate *ACTable::ACTemplateOf(UBYTE idx,ScanType,UBYTE,UBYTE,UBYTE)
{
#if ACCUSOFT_CODE
assert(m_pParameters && idx < 4);
idx += 4;
if (m_pParameters[idx] == NULL) {
m_pParameters[idx] = new(m_pEnviron) class ACTemplate(m_pEnviron);
m_pParameters[idx]->InitDefaults();
}
return m_pParameters[idx];
#else
NOREF(idx);
return NULL;
#endif
}
///
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