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90 lines
2.1 KiB
C++
90 lines
2.1 KiB
C++
/*
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* monodelay.cpp - defination of MonoDelay class.
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*
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* Copyright (c) 2014 David French <dave/dot/french3/at/googlemail/dot/com>
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*
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* This file is part of LMMS - http://lmms.io
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program (see COPYING); if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*
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*/
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#include "monodelay.h"
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#include "interpolation.h"
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#include "lmms_math.h"
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MonoDelay::MonoDelay( int maxTime , int sampleRate )
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{
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m_buffer = 0;
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m_maxTime = maxTime;
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m_maxLength = maxTime * sampleRate;
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m_length = m_maxLength;
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m_index = 0;
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m_feedback = 0.0f;
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setSampleRate( sampleRate );
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}
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MonoDelay::~MonoDelay()
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{
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if( m_buffer )
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{
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delete m_buffer;
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}
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}
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void MonoDelay::tick( sample_t* sample )
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{
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m_buffer[m_index] = *sample;
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int readIndex = m_index - ( int )m_length;
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if(readIndex < 0)
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{
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readIndex += m_maxLength;
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}
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float fract = fraction( m_length );
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if(readIndex != m_maxLength-1 )
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{
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*sample = linearInterpolate(m_buffer[readIndex] ,
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m_buffer[readIndex+1], fract );
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} else
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{
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*sample = linearInterpolate(m_buffer[readIndex] ,
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m_buffer[0], fract );
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}
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m_buffer[m_index] += *sample * m_feedback;
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m_index = ( m_index +1 ) % m_maxLength;
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}
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void MonoDelay::setSampleRate( int sampleRate )
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{
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if( m_buffer )
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{
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delete m_buffer;
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}
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m_buffer = new sample_t[( int )( sampleRate * m_maxTime )];
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}
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