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/***************************************************************************
Delay.cpp - delay line for small delays
-------------------
begin : Sun Nov 11 2007
copyright : (C) 2007 by Thomas Eschenbacher
email : 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 <QString>
#include "libkwave/modules/Delay.h"
//***************************************************************************
Kwave::Delay::Delay()
:Kwave::SampleSource(), m_fifo(), m_out_buffer(blockSize()), m_delay(0)
{
}
//***************************************************************************
Kwave::Delay::~Delay()
{
}
//***************************************************************************
void Kwave::Delay::goOn()
{
m_fifo.get(m_out_buffer);
emit output(m_out_buffer);
}
//***************************************************************************
void Kwave::Delay::input(Kwave::SampleArray data)
{
m_fifo.put(data);
}
//***************************************************************************
void Kwave::Delay::setDelay(const QVariant &d)
{
unsigned int new_delay = QVariant(d).toUInt();
if (new_delay == m_delay) return; // nothing to do
// fill it with zeroes, up to the delay time
m_fifo.flush();
Kwave::SampleArray zeroes(blockSize());
Q_ASSERT(zeroes.size() == blockSize());
for (unsigned int pos=0; pos < blockSize(); ++pos)
zeroes[pos] = 0;
unsigned int rest = new_delay;
while (rest) {
bool ok = true;
unsigned int len = blockSize();
if (rest < len) {
ok = zeroes.resize(rest);
Q_ASSERT(ok);
}
if (ok) m_fifo.put(zeroes);
rest -= zeroes.size();
}
}
//***************************************************************************
//***************************************************************************
#include "moc_Delay.cpp"
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