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https://github.com/LMMS/lmms.git
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95 lines
1.9 KiB
C++
95 lines
1.9 KiB
C++
/*
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* RmsHelper.h - helper class for calculating RMS
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*
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* Copyright (c) 2014 Vesa Kivimäki <contact/dot/diizy/at/nbl/dot/fi>
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* Copyright (c) 2008 Tobias Doerffel <tobydox/at/users.sourceforge.net>
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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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#ifndef RMS_HELPER_H
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#define RMS_HELPER_H
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#include "lmms_math.h"
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class RmsHelper
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{
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public:
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RmsHelper( int size ) :
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m_buffer( NULL )
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{
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setSize( size );
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}
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virtual ~RmsHelper()
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{
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if( m_buffer ) delete[] m_buffer;
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}
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inline void setSize( int size )
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{
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if( m_buffer )
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{
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if( m_size < size )
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{
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delete m_buffer;
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m_buffer = new float[ size ];
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m_size = size;
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reset();
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}
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else
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{
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m_size = size;
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reset();
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}
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}
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else
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{
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m_buffer = new float[ size ];
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m_size = size;
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reset();
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}
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}
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inline void reset()
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{
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m_sizef = 1.0f / (float) m_size;
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m_pos = 0;
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m_sum = 0.0f;
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memset( m_buffer, 0, m_size * sizeof( float ) );
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}
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inline float update( const float in )
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{
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m_sum -= m_buffer[ m_pos ];
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m_sum += m_buffer[ m_pos ] = in * in;
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++m_pos %= m_size;
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return sqrtf( m_sum * m_sizef );
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}
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private:
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float * m_buffer;
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float m_sum;
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unsigned int m_pos;
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unsigned int m_size;
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float m_sizef;
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};
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#endif
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