Tobias Doerffel
20589f19e4
Until now, Mixer not only was responsible for rendering audio buffers but also managed writing them to audio backend (through a FIFO) and handled various quality related parameters. All this functionality has been moved into the new AudioOutputContext class. It glues together AudioBackend (formerly called AudioDevice), global quality settings and the Mixer. The AudioOutputContext class creates a FifoWriter which calls Mixer::renderNextBuffer() and writes the output into the BufferFifo of the AudioOutputContext it belongs to. The BufferFifo is read by the according AudioBackend which belongs to the AudioOutputContext as well. The AudioOutputContext also handles resampling in case the AudioBackend wants the buffers in a different samplerate. During this rewrite the Mixer class and the according source files have been renamed from "mixer" to "Mixer". This results in small changes all over LMMS' code base.
552 lines
12 KiB
C++
552 lines
12 KiB
C++
/*
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* Oscillator.cpp - implementation of powerful oscillator-class
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*
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* Copyright (c) 2004-2009 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 "Oscillator.h"
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#include "engine.h"
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#include "Mixer.h"
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#include "AutomatableModel.h"
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Oscillator::Oscillator( const IntModel * _wave_shape_model,
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const IntModel * _mod_algo_model,
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const float & _freq,
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const float & _detuning,
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const float & _phase_offset,
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const float & _volume,
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Oscillator * _sub_osc ) :
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m_waveShapeModel( _wave_shape_model ),
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m_modulationAlgoModel( _mod_algo_model ),
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m_freq( _freq ),
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m_detuning( _detuning ),
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m_volume( _volume ),
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m_ext_phaseOffset( _phase_offset ),
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m_subOsc( _sub_osc ),
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m_phaseOffset( _phase_offset ),
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m_phase( _phase_offset ),
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m_userWave( NULL )
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{
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}
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void Oscillator::update( sampleFrame * _ab, const fpp_t _frames,
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const ch_cnt_t _chnl )
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{
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if( m_freq >= engine::mixer()->processingSampleRate() / 2 )
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{
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Mixer::clearAudioBuffer( _ab, _frames );
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return;
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}
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if( m_subOsc != NULL )
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{
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switch( m_modulationAlgoModel->value() )
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{
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case PhaseModulation:
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updatePM( _ab, _frames, _chnl );
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break;
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case AmplitudeModulation:
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updateAM( _ab, _frames, _chnl );
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break;
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case SignalMix:
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updateMix( _ab, _frames, _chnl );
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break;
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case SynchronizedBySubOsc:
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updateSync( _ab, _frames, _chnl );
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break;
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case FrequencyModulation:
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updateFM( _ab, _frames, _chnl );
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}
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}
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else
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{
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updateNoSub( _ab, _frames, _chnl );
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}
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}
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void Oscillator::updateNoSub( sampleFrame * _ab, const fpp_t _frames,
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const ch_cnt_t _chnl )
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{
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switch( m_waveShapeModel->value() )
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{
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case SineWave:
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default:
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updateNoSub<SineWave>( _ab, _frames, _chnl );
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break;
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case TriangleWave:
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updateNoSub<TriangleWave>( _ab, _frames, _chnl );
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break;
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case SawWave:
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updateNoSub<SawWave>( _ab, _frames, _chnl );
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break;
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case SquareWave:
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updateNoSub<SquareWave>( _ab, _frames, _chnl );
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break;
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case MoogSawWave:
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updateNoSub<MoogSawWave>( _ab, _frames, _chnl );
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break;
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case ExponentialWave:
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updateNoSub<ExponentialWave>( _ab, _frames, _chnl );
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break;
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case WhiteNoise:
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updateNoSub<WhiteNoise>( _ab, _frames, _chnl );
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break;
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case UserDefinedWave:
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updateNoSub<UserDefinedWave>( _ab, _frames, _chnl );
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break;
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}
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}
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void Oscillator::updatePM( sampleFrame * _ab, const fpp_t _frames,
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const ch_cnt_t _chnl )
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{
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switch( m_waveShapeModel->value() )
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{
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case SineWave:
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default:
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updatePM<SineWave>( _ab, _frames, _chnl );
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break;
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case TriangleWave:
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updatePM<TriangleWave>( _ab, _frames, _chnl );
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break;
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case SawWave:
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updatePM<SawWave>( _ab, _frames, _chnl );
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break;
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case SquareWave:
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updatePM<SquareWave>( _ab, _frames, _chnl );
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break;
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case MoogSawWave:
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updatePM<MoogSawWave>( _ab, _frames, _chnl );
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break;
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case ExponentialWave:
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updatePM<ExponentialWave>( _ab, _frames, _chnl );
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break;
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case WhiteNoise:
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updatePM<WhiteNoise>( _ab, _frames, _chnl );
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break;
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case UserDefinedWave:
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updatePM<UserDefinedWave>( _ab, _frames, _chnl );
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break;
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}
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}
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void Oscillator::updateAM( sampleFrame * _ab, const fpp_t _frames,
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const ch_cnt_t _chnl )
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{
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switch( m_waveShapeModel->value() )
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{
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case SineWave:
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default:
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updateAM<SineWave>( _ab, _frames, _chnl );
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break;
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case TriangleWave:
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updateAM<TriangleWave>( _ab, _frames, _chnl );
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break;
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case SawWave:
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updateAM<SawWave>( _ab, _frames, _chnl );
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break;
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case SquareWave:
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updateAM<SquareWave>( _ab, _frames, _chnl );
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break;
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case MoogSawWave:
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updateAM<MoogSawWave>( _ab, _frames, _chnl );
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break;
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case ExponentialWave:
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updateAM<ExponentialWave>( _ab, _frames, _chnl );
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break;
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case WhiteNoise:
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updateAM<WhiteNoise>( _ab, _frames, _chnl );
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break;
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case UserDefinedWave:
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updateAM<UserDefinedWave>( _ab, _frames, _chnl );
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break;
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}
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}
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void Oscillator::updateMix( sampleFrame * _ab, const fpp_t _frames,
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const ch_cnt_t _chnl )
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{
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switch( m_waveShapeModel->value() )
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{
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case SineWave:
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default:
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updateMix<SineWave>( _ab, _frames, _chnl );
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break;
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case TriangleWave:
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updateMix<TriangleWave>( _ab, _frames, _chnl );
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break;
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case SawWave:
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updateMix<SawWave>( _ab, _frames, _chnl );
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break;
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case SquareWave:
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updateMix<SquareWave>( _ab, _frames, _chnl );
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break;
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case MoogSawWave:
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updateMix<MoogSawWave>( _ab, _frames, _chnl );
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break;
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case ExponentialWave:
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updateMix<ExponentialWave>( _ab, _frames, _chnl );
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break;
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case WhiteNoise:
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updateMix<WhiteNoise>( _ab, _frames, _chnl );
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break;
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case UserDefinedWave:
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updateMix<UserDefinedWave>( _ab, _frames, _chnl );
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break;
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}
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}
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void Oscillator::updateSync( sampleFrame * _ab, const fpp_t _frames,
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const ch_cnt_t _chnl )
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{
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switch( m_waveShapeModel->value() )
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{
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case SineWave:
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default:
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updateSync<SineWave>( _ab, _frames, _chnl );
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break;
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case TriangleWave:
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updateSync<TriangleWave>( _ab, _frames, _chnl );
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break;
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case SawWave:
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updateSync<SawWave>( _ab, _frames, _chnl );
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break;
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case SquareWave:
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updateSync<SquareWave>( _ab, _frames, _chnl );
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break;
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case MoogSawWave:
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updateSync<MoogSawWave>( _ab, _frames, _chnl );
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break;
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case ExponentialWave:
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updateSync<ExponentialWave>( _ab, _frames, _chnl );
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break;
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case WhiteNoise:
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updateSync<WhiteNoise>( _ab, _frames, _chnl );
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break;
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case UserDefinedWave:
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updateSync<UserDefinedWave>( _ab, _frames, _chnl );
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break;
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}
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}
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void Oscillator::updateFM( sampleFrame * _ab, const fpp_t _frames,
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const ch_cnt_t _chnl )
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{
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switch( m_waveShapeModel->value() )
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{
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case SineWave:
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default:
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updateFM<SineWave>( _ab, _frames, _chnl );
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break;
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case TriangleWave:
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updateFM<TriangleWave>( _ab, _frames, _chnl );
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break;
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case SawWave:
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updateFM<SawWave>( _ab, _frames, _chnl );
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break;
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case SquareWave:
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updateFM<SquareWave>( _ab, _frames, _chnl );
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break;
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case MoogSawWave:
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updateFM<MoogSawWave>( _ab, _frames, _chnl );
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break;
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case ExponentialWave:
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updateFM<ExponentialWave>( _ab, _frames, _chnl );
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break;
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case WhiteNoise:
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updateFM<WhiteNoise>( _ab, _frames, _chnl );
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break;
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case UserDefinedWave:
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updateFM<UserDefinedWave>( _ab, _frames, _chnl );
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break;
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}
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}
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// should be called every time phase-offset is changed...
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inline void Oscillator::recalcPhase()
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{
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if( !typeInfo<float>::isEqual( m_phaseOffset, m_ext_phaseOffset ) )
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{
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m_phase -= m_phaseOffset;
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m_phaseOffset = m_ext_phaseOffset;
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m_phase += m_phaseOffset;
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}
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m_phase = absFraction( m_phase )+2; // make sure we're not running
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// negative when doing PM
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}
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inline bool Oscillator::syncOk( float _osc_coeff )
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{
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const float v1 = m_phase;
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m_phase += _osc_coeff;
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// check whether m_phase is in next period
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return( floorf( m_phase ) > floorf( v1 ) );
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}
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float Oscillator::syncInit( sampleFrame * _ab, const fpp_t _frames,
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const ch_cnt_t _chnl )
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{
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if( m_subOsc != NULL )
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{
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m_subOsc->update( _ab, _frames, _chnl );
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}
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recalcPhase();
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return( m_freq * m_detuning );
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}
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// if we have no sub-osc, we can't do any modulation... just get our samples
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template<Oscillator::WaveShapes W>
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void Oscillator::updateNoSub( sampleFrame * _ab, const fpp_t _frames,
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const ch_cnt_t _chnl )
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{
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recalcPhase();
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const float osc_coeff = m_freq * m_detuning;
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for( fpp_t frame = 0; frame < _frames; ++frame )
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{
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_ab[frame][_chnl] = getSample<W>( m_phase ) * m_volume;
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m_phase += osc_coeff;
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}
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}
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// do pm by using sub-osc as modulator
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template<Oscillator::WaveShapes W>
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void Oscillator::updatePM( sampleFrame * _ab, const fpp_t _frames,
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const ch_cnt_t _chnl )
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{
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m_subOsc->update( _ab, _frames, _chnl );
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recalcPhase();
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const float osc_coeff = m_freq * m_detuning;
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for( fpp_t frame = 0; frame < _frames; ++frame )
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{
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_ab[frame][_chnl] = getSample<W>( m_phase +
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_ab[frame][_chnl] )
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* m_volume;
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m_phase += osc_coeff;
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}
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}
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// do am by using sub-osc as modulator
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template<Oscillator::WaveShapes W>
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void Oscillator::updateAM( sampleFrame * _ab, const fpp_t _frames,
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const ch_cnt_t _chnl )
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{
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m_subOsc->update( _ab, _frames, _chnl );
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recalcPhase();
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const float osc_coeff = m_freq * m_detuning;
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for( fpp_t frame = 0; frame < _frames; ++frame )
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{
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_ab[frame][_chnl] *= getSample<W>( m_phase ) * m_volume;
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m_phase += osc_coeff;
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}
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}
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// do mix by using sub-osc as mix-sample
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template<Oscillator::WaveShapes W>
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void Oscillator::updateMix( sampleFrame * _ab, const fpp_t _frames,
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const ch_cnt_t _chnl )
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{
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m_subOsc->update( _ab, _frames, _chnl );
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recalcPhase();
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const float osc_coeff = m_freq * m_detuning;
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for( fpp_t frame = 0; frame < _frames; ++frame )
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{
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_ab[frame][_chnl] += getSample<W>( m_phase ) * m_volume;
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m_phase += osc_coeff;
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}
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}
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// sync with sub-osc (every time sub-osc starts new period, we also start new
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// period)
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template<Oscillator::WaveShapes W>
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void Oscillator::updateSync( sampleFrame * _ab, const fpp_t _frames,
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const ch_cnt_t _chnl )
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{
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const float sub_osc_coeff = m_subOsc->syncInit( _ab, _frames, _chnl );
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recalcPhase();
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const float osc_coeff = m_freq * m_detuning;
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for( fpp_t frame = 0; frame < _frames ; ++frame )
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{
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if( m_subOsc->syncOk( sub_osc_coeff ) )
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{
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m_phase = m_phaseOffset;
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}
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_ab[frame][_chnl] = getSample<W>( m_phase ) * m_volume;
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m_phase += osc_coeff;
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}
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}
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// do fm by using sub-osc as modulator
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template<Oscillator::WaveShapes W>
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void Oscillator::updateFM( sampleFrame * _ab, const fpp_t _frames,
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const ch_cnt_t _chnl )
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{
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m_subOsc->update( _ab, _frames, _chnl );
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recalcPhase();
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const float osc_coeff = m_freq * m_detuning;
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const float sampleRateCorrection = 44100.0f /
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engine::mixer()->processingSampleRate();
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for( fpp_t frame = 0; frame < _frames; ++frame )
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{
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m_phase += _ab[frame][_chnl] * sampleRateCorrection;
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_ab[frame][_chnl] = getSample<W>( m_phase ) * m_volume;
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m_phase += osc_coeff;
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}
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}
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template<>
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inline sample_t Oscillator::getSample<Oscillator::SineWave>(
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const float _sample )
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{
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return( sinSample( _sample ) );
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}
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template<>
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inline sample_t Oscillator::getSample<Oscillator::TriangleWave>(
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const float _sample )
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{
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return( triangleSample( _sample ) );
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}
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template<>
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inline sample_t Oscillator::getSample<Oscillator::SawWave>(
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const float _sample )
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{
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return( sawSample( _sample ) );
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}
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template<>
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inline sample_t Oscillator::getSample<Oscillator::SquareWave>(
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const float _sample )
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{
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return( squareSample( _sample ) );
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}
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template<>
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inline sample_t Oscillator::getSample<Oscillator::MoogSawWave>(
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const float _sample )
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{
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return( moogSawSample( _sample ) );
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}
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template<>
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inline sample_t Oscillator::getSample<Oscillator::ExponentialWave>(
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const float _sample )
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{
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return( expSample( _sample ) );
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}
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template<>
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inline sample_t Oscillator::getSample<Oscillator::WhiteNoise>(
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const float _sample )
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{
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return( noiseSample( _sample ) );
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}
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template<>
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inline sample_t Oscillator::getSample<Oscillator::UserDefinedWave>(
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const float _sample )
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{
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return( userWaveSample( _sample ) );
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}
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