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/***************************************************************************
SidFilter.cpp - read filter
-------------------
begin : Sun Mar 11 2001
copyright : (C) 2001 by Simon White
email : s_a_white@email.com
***************************************************************************/
/***************************************************************************
* *
* 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 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include <new>
#include <math.h>
#include <stdlib.h>
#include "config.h"
#include "SidFilter.h"
SidFilter::SidFilter ()
:m_status(false)
{
m_errorString = "SID Filter: No filter loaded";
}
SidFilter::~SidFilter ()
{
clear ();
}
void SidFilter::clear ()
{
m_filter.points = 0;
m_status = false;
m_errorString = "SID Filter: No filter loaded";
}
void SidFilter::read (char *filename)
{
ini_fd_t ini = ini_open (filename, "r", ";");
// Illegal ini fd
if (!ini)
{
m_status = false;
m_errorString = "SID Filter: Unable to open filter file";
return;
}
read (ini, "Filter");
ini_close (ini);
}
void SidFilter::read (ini_fd_t ini, char *heading)
{
int type = 1;
clear ();
m_status = true;
if (ini_locateHeading (ini, heading) < 0)
{
m_status = false;
m_errorString = "SID Filter: Unable to locate filter section in input file";
return;
}
(void) ini_locateKey (ini, "type");
(void) ini_readInt (ini, &type);
switch (type)
{
case 1:
readType1 (ini);
break;
case 2:
readType2 (ini);
break;
default:
m_status = false;
m_errorString = "SID Filter: Invalid filter type";
break;
}
}
void SidFilter::readType1 (ini_fd_t ini)
{
int points;
// Does Section exist in ini file
if (ini_locateKey (ini, "points") < 0)
goto SidFilter_readType1_errorDefinition;
if (ini_readInt (ini, &points) < 0)
goto SidFilter_readType1_errorDefinition;
// Make sure there are enough filter points
if ((points < 2) || (points > 0x800))
goto SidFilter_readType1_errorDefinition;
m_filter.points = (uint_least16_t) points;
// Set the ini reader up for array access
if (ini_listDelims (ini, ",") < 0)
goto SidFilter_readType1_errorMemory;
{
char key[12];
int reg = -1, fc = -1;
for (int i = 0; i < m_filter.points; i++)
{ // First lets read the SID cutoff register value
sprintf (key, "point%d", i + 1);
ini_locateKey (ini, key);
if (ini_readInt (ini, ®) < 0)
goto SidFilter_readType1_errorDefinition;
if (ini_readInt (ini, &fc) < 0)
goto SidFilter_readType1_errorDefinition;
// Got valid reg/fc
m_filter.cutoff[i][0] = (uint) reg;
m_filter.cutoff[i][1] = (uint) fc;
}
}
return;
SidFilter_readType1_errorDefinition:
clear ();
m_errorString = "SID Filter: Invalid Type 1 filter definition";
m_status = false;
return;
SidFilter_readType1_errorMemory:
m_errorString = "SID Filter: Out of memory";
m_status = false;
}
void SidFilter::readType2 (ini_fd_t ini)
{
double fs, fm, ft;
// Read filter parameters
ini_locateKey (ini, "fs");
if (ini_readDouble (ini, &fs) < 0)
goto SidFilter_readType2_errorDefinition;
ini_locateKey (ini, "fm");
if (ini_readDouble (ini, &fm) < 0)
goto SidFilter_readType2_errorDefinition;
ini_locateKey (ini, "ft");
if (ini_readDouble (ini, &ft) < 0)
goto SidFilter_readType2_errorDefinition;
// Calculate the filter
calcType2 (fs, fm, ft);
return;
SidFilter_readType2_errorDefinition:
clear ();
m_errorString = "SID Filter: Invalid Type 2 filter definition";
m_status = false;
}
// Calculate a Type 2 filter (Sidplay 1 Compatible)
void SidFilter::calcType2 (double fs, double fm, double ft)
{
double fcMax = 1.0;
double fcMin = 0.01;
double fc;
// Definition from reSID
m_filter.points = 0x100;
// Create filter
for (uint i = 0; i < 0x100; i++)
{
uint rk = i << 3;
m_filter.cutoff[i][0] = rk;
fc = exp ((double) rk / 0x800 * log (fs)) / fm + ft;
if (fc < fcMin)
fc = fcMin;
if (fc > fcMax)
fc = fcMax;
m_filter.cutoff[i][1] = (uint) (fc * 4100);
}
}
// Get filter
const sid_filter_t *SidFilter::provide () const
{
if (!m_status)
return NULL;
return &m_filter;
}
// Copy filter from another SidFilter class
const SidFilter &SidFilter::operator= (const SidFilter &filter)
{
(void) operator= (filter.provide ());
return filter;
}
// Copy sidplay2 sid_filter_t object
const sid_filter_t &SidFilter::operator= (const sid_filter_t &filter)
{
m_filter = filter;
m_status = true;
return filter;
}
const sid_filter_t *SidFilter::operator= (const sid_filter_t *filter)
{
m_status = false;
if (filter)
(void) operator= (*filter);
return filter;
}
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