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/***************************************************************************
Filter.cpp - parameters of a digital IIR or FIR filter
-------------------
begin : Jan 20 2001
copyright : (C) 2001 by Thomas Eschenbacher
email : Thomas Eschenbacher <thomas.eschenbacher@gmx.de>
***************************************************************************/
/***************************************************************************
* *
* 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 "config.h"
#include <QFile>
#include <QLatin1Char>
#include <QString>
#include <QTextStream>
#include "libkwave/Filter.h"
#include "libkwave/Parser.h"
#include "libkwave/String.h"
#include "libkwave/Utils.h"
//***************************************************************************
Kwave::Filter::Filter(const QString &command)
:m_fir(true), m_rate(0), m_coeff(), m_delay()
{
Kwave::Parser parse(command);
m_rate = parse.toInt();
m_fir = (parse.nextParam().toLower() == _("fir"));
resize(parse.toInt());
for (unsigned int i = 0; i < count(); i++) {
m_delay[i] = parse.toInt();
m_coeff[i] = parse.toDouble();
}
}
//***************************************************************************
Kwave::Filter::Filter(int rate)
:m_fir(true), m_rate(rate), m_coeff(), m_delay()
{
}
//***************************************************************************
Kwave::Filter::~Filter()
{
resize(0);
}
//***************************************************************************
QString Kwave::Filter::command()
{
QString s;
s = _("filter (");
s += QString::number(m_rate);
s += QLatin1Char(',');
s += _((m_fir) ? "fir" : "iir");
s += QLatin1Char(',') + QString::number(count());
for (unsigned int i = 0; i < count(); i++) {
s += QLatin1Char(',');
s += QString::number(m_delay[i]);
s += QLatin1Char(',');
s += QString::number(m_coeff[i]);
}
return s;
}
//***************************************************************************
unsigned int Kwave::Filter::resize(unsigned int newnum)
{
unsigned int oldnum = count();
if (newnum == oldnum) return oldnum; // nothing to do
// resize both arrays
m_delay.resize(newnum);
m_coeff.resize(newnum);
Q_ASSERT(m_delay.size() >= Kwave::toInt(newnum));
Q_ASSERT(m_coeff.size() >= Kwave::toInt(newnum));
Q_ASSERT(m_delay.size() == m_coeff.size());
// initialize the new entries
while (oldnum < newnum) {
m_delay[oldnum] = oldnum;
m_coeff[oldnum] = 0.0;
oldnum++;
}
return newnum;
}
//***************************************************************************
unsigned int Kwave::Filter::count()
{
Q_ASSERT(m_coeff.count() == m_delay.count());
return static_cast<unsigned int>(m_coeff.count());
}
//***************************************************************************
double Kwave::Filter::coeff(unsigned int index)
{
Q_ASSERT(Kwave::toInt(index) < m_coeff.count());
return m_coeff[index];
}
//***************************************************************************
void Kwave::Filter::setCoeff(unsigned int index, double newval)
{
Q_ASSERT(Kwave::toInt(index) < m_coeff.count());
m_coeff[index] = newval;
}
//***************************************************************************
unsigned int Kwave::Filter::delay(unsigned int index)
{
Q_ASSERT(Kwave::toInt(index) < m_delay.count());
return m_delay[index];
}
//***************************************************************************
void Kwave::Filter::setDelay(unsigned int index, unsigned int newval)
{
Q_ASSERT(Kwave::toInt(index) < m_delay.count());
m_delay[index] = newval;
}
//***************************************************************************
void Kwave::Filter::save(const QString &filename)
{
QString name(filename);
Q_ASSERT(name.length());
if (!name.length()) return;
if (name.lastIndexOf(_(".filter")) != Kwave::toInt(name.length() - 7))
name.append(_(".filter"));
QFile file(name);
file.open(QIODevice::WriteOnly);
QTextStream out(&file);
out << ((m_fir) ? "FIR " : "IIR ") << count() << Qt::endl;
for (unsigned int i = 0; i < count(); i++) {
out << m_delay[i] << ' ' << m_coeff[i] << Qt::endl;
}
file.close();
}
//***************************************************************************
void Kwave::Filter::load(const QString &filename)
{
unsigned int i;
bool ok;
QString line;
unsigned int linenr = 0;
QFile file(filename);
file.open(QIODevice::ReadOnly);
QTextStream in(&file);
// type of the filter (FIR/IIR)
while (!in.atEnd()) {
line = in.readLine().simplified();
linenr++;
if (line.isEmpty()) continue;
if ((line[0] == QLatin1Char('#')) || (line[0] == QLatin1Char('/')))
continue;
break;
}
m_fir = line.startsWith(_("FIR "));
qDebug("Filter::load(): fir = %d", m_fir);
// order
unsigned int order = line.remove(0,4).toUInt(&ok);
resize(0);
resize(order);
qDebug("Filter::load(): order = %u", order);
// read delays and coefficients
i = 0;
while (!in.atEnd()) {
line = in.readLine().simplified();
linenr++;
if (line.isEmpty()) continue;
if ((line[0] == QLatin1Char('#')) || (line[0] == QLatin1Char('/')))
continue;
qsizetype spacepos = line.indexOf(QLatin1Char(' '));
ok = true;
m_delay[i] = line.left(spacepos).toUInt(&ok);
line.remove(0, spacepos);
if (ok) m_coeff[i] = line.toDouble(&ok);
if (ok) {
i++;
} else {
qDebug("Filter::load(%s): syntax error in line %u",
DBG(filename), linenr);
}
}
}
//***************************************************************************
//***************************************************************************
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