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/*
Copyright (C) 2000 Stefan Westerfeld
stefan@space.twc.de
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include <math.h>
#include "artsflow.h"
#include "stdsynthmodule.h"
#include "flowsystem.h"
#include <debug.h>
#include <cstring>
using namespace Arts;
namespace Arts {
class StereoVolumeControl_impl : virtual public StereoVolumeControl_skel,
virtual public StdSynthModule
{
float _scaleFactor;
float _currentVolumeLeft;
float _currentVolumeRight;
bool _virtualized;
bool _calcVolume;
public:
StereoVolumeControl_impl() :_scaleFactor(1.0), _currentVolumeLeft(0.0),
_currentVolumeRight(0.0), _virtualized( false ),
_calcVolume( false )
{
virtualize();
}
/*attribute float scaleFactor;*/
void scaleFactor(float newFactor) {
if(_scaleFactor != newFactor)
{
_scaleFactor = newFactor;
scaleFactor_changed(newFactor);
if( _scaleFactor == 1.0 )
{
if( !_calcVolume && !_virtualized )
virtualize();
}
else if( _virtualized )
devirtualize();
}
}
float scaleFactor() { return _scaleFactor; }
/*
readonly attribute float currentVolumeLeft;
readonly attribute float currentVolumeRight;
*/
float currentVolumeLeft()
{
if( _virtualized && !_calcVolume )
needVolumeCalculation();
return _currentVolumeLeft;
}
float currentVolumeRight()
{
if( _virtualized && !_calcVolume )
needVolumeCalculation();
return _currentVolumeRight;
}
void needVolumeCalculation()
{
arts_debug( "calculate Volume in StereoVolumeControl" );
_calcVolume = true;
devirtualize();
}
void virtualize()
{
arts_debug( "virtualize StereoVolumeControl" );
_virtualized = true;
_node()->virtualize( "inleft", _node(), "outleft" );
_node()->virtualize( "inright", _node(), "outright" );
_currentVolumeRight = _currentVolumeLeft = 0.0;
}
void devirtualize()
{
arts_debug( "devirtualize StereoVolumeControl" );
_virtualized = false;
_node()->devirtualize( "inleft", _node(), "outleft" );
_node()->devirtualize( "inright", _node(), "outright" );
}
/*
in audio stream inleft, inright;
out audio stream outleft, outright;
*/
void calculateBlock(unsigned long samples)
{
if( _scaleFactor == 1.0 )
{
if( _calcVolume )
{
/*
* make sure that we reach zero sometimes - otherwise there are
* performance issues with calculations close to zero
*/
if(fabs(_currentVolumeLeft) < 0.001) _currentVolumeLeft = 0.0;
if(fabs(_currentVolumeRight) < 0.001) _currentVolumeRight = 0.0;
for( unsigned long i = 0; i < samples; i += 10 )
{
/* measure volume */
float delta;
// left
delta = fabs( outleft[ i ] ) - _currentVolumeLeft;
if( delta > 0.0 )
_currentVolumeLeft += 0.1 * delta;
else
_currentVolumeLeft += 0.003 * delta;
// right
delta = fabs( outright[ i ] ) - _currentVolumeRight;
if( delta > 0.0 )
_currentVolumeRight += 0.1 * delta;
else
_currentVolumeRight += 0.003 * delta;
}
memcpy( outleft, inleft, samples * sizeof( float ) );
memcpy( outright, inright, samples * sizeof( float ) );
}
return;
}
unsigned long i;
/*
* make sure that we reach zero sometimes - otherwise there are
* performance issues with calculations close to zero
*/
if(fabs(_currentVolumeLeft) < 0.001) _currentVolumeLeft = 0.0;
if(fabs(_currentVolumeRight) < 0.001) _currentVolumeRight = 0.0;
for(i=0;i<samples;i++)
{
/* scale */
outleft[i] = inleft[i] * _scaleFactor;
outright[i] = inright[i] * _scaleFactor;
/* measure volume */
float delta;
// left
delta = fabs(outleft[i])-_currentVolumeLeft;
if(delta > 0.0)
_currentVolumeLeft += 0.01 * delta;
else
_currentVolumeLeft += 0.0003 * delta;
// right
delta = fabs(outright[i])-_currentVolumeRight;
if(delta > 0.0)
_currentVolumeRight += 0.01 * delta;
else
_currentVolumeRight += 0.0003 * delta;
}
}
AutoSuspendState autoSuspend() {
return (_currentVolumeLeft+_currentVolumeRight<0.001)?
asSuspend : asNoSuspend;
}
};
REGISTER_IMPLEMENTATION(StereoVolumeControl_impl);
}
// vim: sw=4 ts=4 noet
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