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/*
Common functions
(c) Fraser Stuart 2009
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <math.h>
#include <ladspa.h>
#include "libinv_common.h"
/* a function that checks to see if a control has been changed and calls the provided conversion fuction */
void checkParamChange(
unsigned long param,
LADSPA_Data * control,
LADSPA_Data * last,
LADSPA_Data * converted,
unsigned long sr,
LADSPA_Data (*ConvertFunction)(unsigned long, LADSPA_Data, unsigned long)
)
{
if(*control != *last) {
*last=*control;
*converted=(*ConvertFunction)(param, *control, sr);
}
}
/* this function is linear between -0.7 & 0.7 (approx -3db) and returns a value bewteen 0.7 and 1 for an input from 0.7 to infinity */
LADSPA_Data InoClip(LADSPA_Data in)
{
LADSPA_Data out;
if ( fabs(in) < 0.7 )
out = in;
else
out = (in>0) ?
( 0.7 + 0.3 * (1-pow(2.718281828, 3.33333333*(0.7-in)))):
( -0.7 - 0.3 * (1-pow(2.718281828, 3.33333333*(0.7+in))));
return out;
}
/* distortion function based on sin() */
LADSPA_Data ITube(LADSPA_Data in, LADSPA_Data Drive)
{
LADSPA_Data out;
out = (in>0) ? pow( fabs(sin(in*Drive*PI_ON_2)),ITUBE_MAGIC ) : -pow( fabs(sin(-in*Drive*PI_ON_2)),ITUBE_MAGIC );
return out;
}
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