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/***************************************************************************
CurveStreamAdapter_impl.cpp - converter from Curve to aRts sample stream
-------------------
begin : Wed Dec 12 2001
copyright : (C) 2001 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 "libkwave/modules/CurveStreamAdapter.h"
/***************************************************************************/
Kwave::CurveStreamAdapter::CurveStreamAdapter(Kwave::Curve &curve,
sample_index_t length)
:Kwave::SampleSource(),
m_position(0), m_length(length),
m_interpolation(curve.interpolation()),
m_buffer(blockSize())
{
}
/***************************************************************************/
Kwave::CurveStreamAdapter::~CurveStreamAdapter()
{
}
/***************************************************************************/
void Kwave::CurveStreamAdapter::goOn()
{
unsigned int offset;
double x_max = static_cast<double>(m_length);
const unsigned int samples = blockSize();
// fill with interpolated points
for (offset = 0; offset < samples; ++offset) {
// x is [0.0 ... 1.0]
const double x = static_cast<double>(m_position) / x_max;
const double y = m_interpolation.singleInterpolation(x);
m_buffer[offset] = double2sample(y);
m_position++;
// wrap-around, for periodic signals
if (m_position > m_length)
m_position = 0;
}
emit output(m_buffer);
}
/***************************************************************************/
/***************************************************************************/
#include "moc_CurveStreamAdapter.cpp"
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