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/* pink_full.cpp
A full-frequency pink noise generator.
(c) 2002 Nathaniel Virgo
Part of the Computer Music Toolkit - a library of LADSPA plugins.
The Computer Music Toolkit is Copyright (C) 2000-2002
Richard W.E. Furse. The author may be contacted at
richard@muse.demon.co.uk.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public Licence as
published by the Free Software Foundation; either version 2 of the
Licence, or (at your option) any later version.
This library 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 library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307, USA. */
/*****************************************************************************/
#include <stdlib.h>
/*****************************************************************************/
#include "cmt.h"
#include "pinknoise.h"
#include "utils.h"
/*****************************************************************************/
namespace pink_full {
enum {
port_output = 0,
n_ports = 1
};
/** This plugin generates a signal which approximates pink noise, using the
Voss-McCartney algorithm described at www.firstpr.com.au/dsp/pink-noise/ */
class Plugin : public CMT_PluginInstance {
private:
LADSPA_Data sample_rate;
PinkNoise noise_source;
public:
Plugin(const LADSPA_Descriptor *,
unsigned long s_rate) :
CMT_PluginInstance(n_ports),
sample_rate(s_rate) {
}
~Plugin() {
}
friend void activate(LADSPA_Handle instance);
friend void run(LADSPA_Handle instance,
unsigned long sample_count);
};
void activate(LADSPA_Handle instance) {
Plugin *pp = (Plugin *) instance;
Plugin &p = *pp;
p.noise_source.reset();
}
void run(LADSPA_Handle instance,
unsigned long sample_count) {
Plugin *pp = (Plugin *) instance;
Plugin &p = *pp;
LADSPA_Data * out = pp->m_ppfPorts[port_output];
for (unsigned long i=0; i<sample_count; ++i)
*(out++) = p.noise_source.getValue2();
}
void initialise() {
CMT_Descriptor * d = new CMT_Descriptor
(1844,
"pink_full_frequency",
0,
"Pink Noise (full frequency range)",
CMT_MAKER("Nathaniel Virgo"),
CMT_COPYRIGHT("2002", "Nathaniel Virgo"),
NULL,
CMT_Instantiate<Plugin>,
activate,
run,
NULL,
NULL,
NULL);
d->addPort
(LADSPA_PORT_OUTPUT | LADSPA_PORT_AUDIO,
"Output");
registerNewPluginDescriptor(d);
}
} // end of namespace
/*****************************************************************************/
/* EOF */
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