diff options
Diffstat (limited to 'flow/stereovolumecontrol_impl.cc')
| -rw-r--r-- | flow/stereovolumecontrol_impl.cc | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/flow/stereovolumecontrol_impl.cc b/flow/stereovolumecontrol_impl.cc new file mode 100644 index 0000000..ae90ae6 --- /dev/null +++ b/flow/stereovolumecontrol_impl.cc @@ -0,0 +1,197 @@ + /* + + 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., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, 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 |