hashtags/lmms
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases 1 Wiki Activity

MixHelpers: helper functions for mixing buffers

Browse Source 
Introduced central helper functions for mixing buffers in order to
reduce local loops all around LMMS.
This commit is contained in:
Tobias Doerffel
2014-01-08 21:50:43 +01:00
parent 6f7b6978bd
commit 4a99b953b5
2 changed files with 206 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

53
include/MixHelpers.h Normal file
View File

@@ -0,0 +1,53 @@
/*
* MixHelpers.h - helper functions for mixing buffers
*
* Copyright (c) 2014 Tobias Doerffel <tobydox/at/users.sourceforge.net>
*
* This file is part of Linux MultiMedia Studio - http://lmms.sourceforge.net
*
* 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.
*
*/
#ifndef _MIX_HELPERS_H
#define _MIX_HELPERS_H
#include "lmms_basics.h"
namespace MixHelpers
{
/*! \brief Add samples from src to dst */
void add( sampleFrame* dst, const sampleFrame* src, int frames );
/*! \brief Add samples from src multiplied by coeffSrc to dst */
void addMultiplied( sampleFrame* dst, const sampleFrame* src, float coeffSrc, int frames );
/*! \brief Add samples from src multiplied by coeffSrcLeft/coeffSrcRight to dst */
void addMultipliedStereo( sampleFrame* dst, const sampleFrame* src, float coeffSrcLeft, float coeffSrcRight, int frames );
/*! \brief Multiply dst by coeffDst and add samples from src multiplied by coeffSrc */
void multiplyAndAddMultiplied( sampleFrame* dst, const sampleFrame* src, float coeffDst, float coeffSrc, int frames );
/*! \brief Multiply dst by coeffDst and add samples from srcLeft/srcRight multiplied by coeffSrc */
void multiplyAndAddMultipliedJoined( sampleFrame* dst, const sample_t* srcLeft, const sample_t* srcRight, float coeffDst, float coeffSrc, int frames );
}
#endif

153
src/core/MixHelpers.cpp Normal file
View File

@@ -0,0 +1,153 @@
/*
* MixHelpers.cpp - helper functions for mixing buffers
*
* Copyright (c) 2014 Tobias Doerffel <tobydox/at/users.sourceforge.net>
*
* This file is part of Linux MultiMedia Studio - http://lmms.sourceforge.net
*
* 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 "MixHelpers.h"
namespace MixHelpers
{
/*! \brief Function for applying MIXOP on all sample frames */
template<typename MIXOP>
static inline void run( sampleFrame* dst, const sampleFrame* src, int frames, const MIXOP& OP )
{
for( int i = 0; i < frames; ++i )
{
OP( dst[i], src[i] );
}
}
/*! \brief Function for applying MIXOP on all sample frames - split source */
template<typename MIXOP>
static inline void run( sampleFrame* dst, const sample_t* srcLeft, const sample_t* srcRight, int frames, const MIXOP& OP )
{
for( int i = 0; i < frames; ++i )
{
const sampleFrame src = { srcLeft[i], srcRight[i] };
OP( dst[i], src );
}
}
struct AddOp
{
void operator()( sampleFrame& dst, const sampleFrame& src ) const
{
dst[0] += src[0];
dst[1] += src[1];
}
} ;
void add( sampleFrame* dst, const sampleFrame* src, int frames )
{
run<>( dst, src, frames, AddOp() );
}
struct AddMultipliedOp
{
AddMultipliedOp( float coeff ) : m_coeff( coeff ) { }
void operator()( sampleFrame& dst, const sampleFrame& src ) const
{
dst[0] += src[0] * m_coeff;
dst[1] += src[1] * m_coeff;
}
const float m_coeff;
} ;
void addMultiplied( sampleFrame* dst, const sampleFrame* src, float coeffSrc, int frames )
{
run<>( dst, src, frames, AddMultipliedOp(coeffSrc) );
}
struct AddMultipliedStereoOp
{
AddMultipliedStereoOp( float coeffLeft, float coeffRight )
{
m_coeffs[0] = coeffLeft;
m_coeffs[1] = coeffRight;
}
void operator()( sampleFrame& dst, const sampleFrame& src ) const
{
dst[0] += src[0] * m_coeffs[0];
dst[1] += src[1] * m_coeffs[1];
}
float m_coeffs[2];
} ;
void addMultipliedStereo( sampleFrame* dst, const sampleFrame* src, float coeffSrcLeft, float coeffSrcRight, int frames )
{
run<>( dst, src, frames, AddMultipliedStereoOp(coeffSrcLeft, coeffSrcRight) );
}
struct MultiplyAndAddMultipliedOp
{
MultiplyAndAddMultipliedOp( float coeffDst, float coeffSrc )
{
m_coeffs[0] = coeffDst;
m_coeffs[1] = coeffSrc;
}
void operator()( sampleFrame& dst, const sampleFrame& src ) const
{
dst[0] = dst[0]*m_coeffs[0] + src[0]*m_coeffs[1];
dst[1] = dst[1]*m_coeffs[0] + src[1]*m_coeffs[1];
}
float m_coeffs[2];
} ;
void multiplyAndAddMultiplied( sampleFrame* dst, const sampleFrame* src, float coeffDst, float coeffSrc, int frames )
{
run<>( dst, src, frames, MultiplyAndAddMultipliedOp(coeffDst, coeffSrc) );
}
void multiplyAndAddMultipliedJoined( sampleFrame* dst,
const sample_t* srcLeft,
const sample_t* srcRight,
float coeffDst, float coeffSrc, int frames )
{
run<>( dst, srcLeft, srcRight, frames, MultiplyAndAddMultipliedOp(coeffDst, coeffSrc) );
}
}