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4a99b953b5
Introduced central helper functions for mixing buffers in order to reduce local loops all around LMMS.
154 lines
3.5 KiB
C++
154 lines
3.5 KiB
C++
/*
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* MixHelpers.cpp - helper functions for mixing buffers
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*
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* Copyright (c) 2014 Tobias Doerffel <tobydox/at/users.sourceforge.net>
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*
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* This file is part of Linux MultiMedia Studio - http://lmms.sourceforge.net
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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 "MixHelpers.h"
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namespace MixHelpers
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{
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/*! \brief Function for applying MIXOP on all sample frames */
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template<typename MIXOP>
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static inline void run( sampleFrame* dst, const sampleFrame* src, int frames, const MIXOP& OP )
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{
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for( int i = 0; i < frames; ++i )
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{
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OP( dst[i], src[i] );
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}
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}
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/*! \brief Function for applying MIXOP on all sample frames - split source */
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template<typename MIXOP>
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static inline void run( sampleFrame* dst, const sample_t* srcLeft, const sample_t* srcRight, int frames, const MIXOP& OP )
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{
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for( int i = 0; i < frames; ++i )
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{
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const sampleFrame src = { srcLeft[i], srcRight[i] };
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OP( dst[i], src );
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}
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}
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struct AddOp
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{
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void operator()( sampleFrame& dst, const sampleFrame& src ) const
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{
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dst[0] += src[0];
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dst[1] += src[1];
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}
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} ;
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void add( sampleFrame* dst, const sampleFrame* src, int frames )
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{
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run<>( dst, src, frames, AddOp() );
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}
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struct AddMultipliedOp
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{
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AddMultipliedOp( float coeff ) : m_coeff( coeff ) { }
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void operator()( sampleFrame& dst, const sampleFrame& src ) const
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{
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dst[0] += src[0] * m_coeff;
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dst[1] += src[1] * m_coeff;
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}
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const float m_coeff;
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} ;
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void addMultiplied( sampleFrame* dst, const sampleFrame* src, float coeffSrc, int frames )
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{
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run<>( dst, src, frames, AddMultipliedOp(coeffSrc) );
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}
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struct AddMultipliedStereoOp
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{
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AddMultipliedStereoOp( float coeffLeft, float coeffRight )
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{
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m_coeffs[0] = coeffLeft;
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m_coeffs[1] = coeffRight;
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}
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void operator()( sampleFrame& dst, const sampleFrame& src ) const
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{
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dst[0] += src[0] * m_coeffs[0];
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dst[1] += src[1] * m_coeffs[1];
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}
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float m_coeffs[2];
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} ;
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void addMultipliedStereo( sampleFrame* dst, const sampleFrame* src, float coeffSrcLeft, float coeffSrcRight, int frames )
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{
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run<>( dst, src, frames, AddMultipliedStereoOp(coeffSrcLeft, coeffSrcRight) );
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}
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struct MultiplyAndAddMultipliedOp
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{
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MultiplyAndAddMultipliedOp( float coeffDst, float coeffSrc )
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{
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m_coeffs[0] = coeffDst;
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m_coeffs[1] = coeffSrc;
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}
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void operator()( sampleFrame& dst, const sampleFrame& src ) const
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{
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dst[0] = dst[0]*m_coeffs[0] + src[0]*m_coeffs[1];
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dst[1] = dst[1]*m_coeffs[0] + src[1]*m_coeffs[1];
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}
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float m_coeffs[2];
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} ;
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void multiplyAndAddMultiplied( sampleFrame* dst, const sampleFrame* src, float coeffDst, float coeffSrc, int frames )
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{
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run<>( dst, src, frames, MultiplyAndAddMultipliedOp(coeffDst, coeffSrc) );
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}
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void multiplyAndAddMultipliedJoined( sampleFrame* dst,
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const sample_t* srcLeft,
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const sample_t* srcRight,
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float coeffDst, float coeffSrc, int frames )
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{
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run<>( dst, srcLeft, srcRight, frames, MultiplyAndAddMultipliedOp(coeffDst, coeffSrc) );
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}
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}
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