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/*
* monodelay.cpp - defination of MonoDelay class.
*
* Copyright (c) 2014 David French <dave/dot/french3/at/googlemail/dot/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 "MonoDelay.h"
#include "interpolation.h"
#include "lmms_math.h"
#include "string.h"
MonoDelay::MonoDelay( int maxTime , int sampleRate )
{
m_buffer = 0;
m_maxTime = maxTime;
m_maxLength = maxTime * sampleRate;
m_length = m_maxLength;
m_writeIndex = 0;
m_feedback = 0.0f;
setSampleRate( sampleRate );
}
MonoDelay::~MonoDelay()
{
if( m_buffer )
{
delete m_buffer;
}
}
void MonoDelay::tick( sample_t* sample )
{
m_writeIndex = ( m_writeIndex + 1 ) % ( int )m_maxLength;
int readIndex = m_writeIndex - m_length;
if (readIndex < 0 ) { readIndex += m_maxLength; }
float out = m_buffer[ readIndex ];
m_buffer[ m_writeIndex ] = *sample + ( out * m_feedback );
*sample = out;
}
void MonoDelay::setSampleRate( int sampleRate )
{
if( m_buffer )
{
delete m_buffer;
}
m_buffer = new sample_t[( int )( sampleRate * m_maxTime ) ];
memset( m_buffer, 0, sizeof(float) * ( int )( sampleRate * m_maxTime ) );
}
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