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/*
Pan.cc
Copyright 2002-5 Tim Goetze <tim@quitte.de>
http://quitte.de/dsp/
panorama with width control
*/
/*
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.
This program 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 program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA or point your web browser to http://www.gnu.org.
*/
#include "basics.h"
#include "Pan.h"
#include "Descriptor.h"
void
Pan::init (double _fs)
{
fs = _fs;
delay.init ((int) (.040 * fs));
normal = NOISE_FLOOR;
}
void
Pan::activate()
{
delay.reset();
tap.reset (400 / fs);
set_pan (*ports[1]);
}
inline void
Pan::set_pan (d_sample p)
{
pan = p;
double phi = (pan + 1) * M_PI * .25;
gain_l = cos (phi);
gain_r = sin (phi);
}
template <sample_func_t F>
void
Pan::one_cycle (int frames)
{
d_sample * s = ports[0];
if (pan != *ports[1])
set_pan (*ports[1]);
d_sample
width_l = *ports[2] * gain_r,
width_r = *ports[2] * gain_l;
tap.t = (int) (*ports[3] * fs * .001);
bool mono = *ports[4];
d_sample * dl = ports[5];
d_sample * dr = ports[6];
d_sample x, xt;
if (mono) for (int i = 0; i < frames; ++i)
{
x = s[i];
xt = tap.get (delay);
delay.put (x + normal);
x = (gain_l * x + gain_r * x + width_l * xt + width_r * xt) * .5;
F (dl, i, x, adding_gain);
F (dr, i, x, adding_gain);
normal = -normal;
}
else for (int i = 0; i < frames; ++i)
{
x = s[i];
xt = tap.get (delay);
delay.put (x + normal);
F (dl, i, gain_l * x + width_l * xt, adding_gain);
F (dr, i, gain_r * x + width_r * xt, adding_gain);
normal = -normal;
}
}
/* //////////////////////////////////////////////////////////////////////// */
PortInfo
Pan::port_info [] =
{
{
"in",
INPUT | AUDIO,
{0}
}, {
"pan",
INPUT | CONTROL,
{BOUNDED | DEFAULT_0, -1, 1}
}, {
"width",
INPUT | CONTROL,
{BOUNDED | DEFAULT_0, 0, 1}
}, {
"t",
INPUT | CONTROL,
{BOUNDED | DEFAULT_LOW, 0.1, 40}
}, {
"mono",
INPUT | CONTROL,
{BOUNDED | DEFAULT_0 | INTEGER | TOGGLE, 0, 1}
}, {
"out:l",
OUTPUT | AUDIO,
{0}
}, {
"out:r",
OUTPUT | AUDIO,
{0}
}
};
template <> void
Descriptor<Pan>::setup()
{
UniqueID = 1788;
Label = "Pan";
Properties = HARD_RT;
Name = "CAPS: Pan - Pan and width";
Maker = "Tim Goetze <tim@quitte.de>";
Copyright = "GPL, 2004-5";
/* fill port info and vtable */
autogen();
}
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