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/*
* vibrating_sring.h - model of a vibrating string lifted from pluckedSynth
*
* Copyright (c) 2006-2008 Danny McRae <khjklujn/at/yahoo/com>
*
* This file is part of LMMS - https://lmms.io
*
* 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 (see COPYING); if not, write to the
* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA.
*
*/
#include <math.h>
#include "vibrating_string.h"
#include "templates.h"
#include "interpolation.h"
#include "Mixer.h"
#include "Engine.h"
vibratingString::vibratingString( float _pitch,
float _pick,
float _pickup,
float * _impulse,
int _len,
sample_rate_t _sample_rate,
int _oversample,
float _randomize,
float _string_loss,
float _detune,
bool _state ) :
m_oversample( 2 * _oversample / (int)( _sample_rate /
Engine::mixer()->baseSampleRate() ) ),
m_randomize( _randomize ),
m_stringLoss( 1.0f - _string_loss ),
m_state( 0.1f )
{
m_outsamp = new sample_t[m_oversample];
int string_length;
string_length = static_cast<int>( m_oversample * _sample_rate /
_pitch ) + 1;
string_length += static_cast<int>( string_length * -_detune );
int pick = static_cast<int>( ceil( string_length * _pick ) );
if( not _state )
{
m_impulse = new float[string_length];
resample( _impulse, _len, string_length );
}
else
{
m_impulse = new float[_len];
for( int i = 0; i < _len; i++ )
{
m_impulse[i] = _impulse[i];
}
}
m_toBridge = vibratingString::initDelayLine( string_length, pick );
m_fromBridge = vibratingString::initDelayLine( string_length, pick );
vibratingString::setDelayLine( m_toBridge, pick,
m_impulse, _len, 0.5f,
_state );
vibratingString::setDelayLine( m_fromBridge, pick,
m_impulse, _len, 0.5f,
_state);
m_choice = static_cast<int>( m_oversample *
static_cast<float>( rand() ) / RAND_MAX );
m_pickupLoc = static_cast<int>( _pickup * string_length );
}
vibratingString::delayLine * vibratingString::initDelayLine( int _len,
int _pick )
{
delayLine * dl = new vibratingString::delayLine[_len];
dl->length = _len;
if( _len > 0 )
{
dl->data = new sample_t[_len];
float r;
float offset = 0.0f;
for( int i = 0; i < dl->length; i++ )
{
r = static_cast<float>( rand() ) /
RAND_MAX;
offset = ( m_randomize / 2.0f -
m_randomize ) * r;
dl->data[i] = offset;
}
}
else
{
dl->data = NULL;
}
dl->pointer = dl->data;
dl->end = dl->data + _len - 1;
return( dl );
}
void vibratingString::freeDelayLine( delayLine * _dl )
{
if( _dl )
{
delete[] _dl->data;
delete[] _dl;
}
}
void vibratingString::resample( float *_src, f_cnt_t _src_frames,
f_cnt_t _dst_frames )
{
for( f_cnt_t frame = 0; frame < _dst_frames; ++frame )
{
const float src_frame_float = frame *
(float) _src_frames /
_dst_frames;
const float frac_pos = src_frame_float -
static_cast<f_cnt_t>( src_frame_float );
const f_cnt_t src_frame = tLimit<f_cnt_t>(
static_cast<f_cnt_t>( src_frame_float ),
1, _src_frames - 3 );
m_impulse[frame] = cubicInterpolate(
_src[src_frame - 1],
_src[src_frame + 0],
_src[src_frame + 1],
_src[src_frame + 2],
frac_pos );
}
}
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