Synth.cpp

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/*
 * Hydrogen
 * Copyright(c) 2002-2008 by Alex >Comix< Cominu [comix@users.sourceforge.net]
 * Copyright(c) 2008-2025 The hydrogen development team [hydrogen-devel@lists.sourceforge.net]
 *
 * http://www.hydrogen-music.org
 *
 * 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. If not, see https://www.gnu.org/licenses
 *
 */
 
 
#include <core/Synth/Synth.h>
#include <core/Basics/Note.h>
#include <core/Globals.h>
 
#include <cassert>
#include <cmath>
 
namespace H2Core
{
 
Synth::Synth()
                : Object()
{
        
 
        m_pOut_L = new float[ MAX_BUFFER_SIZE ];
        m_pOut_R = new float[ MAX_BUFFER_SIZE ];
 
        m_fTheta = 0.0;
 
        m_pAudioOutput = nullptr;
}
 
 
 
Synth::~Synth()
{
        INFOLOG( "DESTROY" );
        delete[] m_pOut_L;
        delete[] m_pOut_R;
}
 
 
 
 
void Synth::noteOn( Note* pNote )
{
        INFOLOG( "NOTE ON" );
        assert( pNote );
 
        m_playingNotesQueue.push_back( pNote );
}
 
 
 
 
void Synth::noteOff( Note* pNote )
{
        INFOLOG( "NOTE OFF - not implemented yet" );
        assert( pNote );
 
        // delete the older note...
        for ( uint i = 0; i < m_playingNotesQueue.size(); ++i ) {
                Note *pPlayingNote = m_playingNotesQueue[ i ];
                if ( pPlayingNote->get_instrument() == pNote->get_instrument() ) {
                        m_playingNotesQueue.erase( m_playingNotesQueue.begin() + i );
                        delete pPlayingNote;
 
                        delete pNote;
                        pNote = nullptr;
                        break;
                }
        }
 
        ERRORLOG( "note not found" );
}
 
 
 
// perche' viene passata anche la canzone? E' davvero necessaria?
void Synth::process( uint32_t nFrames )
{
        //INFOLOG( "process" );
 
        // cleanup of the output buffers
        memset( m_pOut_L, 0, nFrames * sizeof( float ) );
        memset( m_pOut_R, 0, nFrames * sizeof( float ) );
 
 
        for ( const auto& pPlayingNote :  m_playingNotesQueue ) {
                //pPlayingNote->dumpInfo();
 
                float fAmplitude = pPlayingNote->get_velocity();
                float fFrequency = TWOPI * 220.0 / 44100.0;
 
                for ( uint i = 0; i < nFrames; ++i ) {
                        float fVal = sin( m_fTheta ) * fAmplitude;
                        m_pOut_L[ i ] += fVal;
                        m_pOut_R[ i ] += fVal;
 
                        m_fTheta += fFrequency;
                }
        }
}
 
 
void Synth::setAudioOutput( AudioOutput* pAudioOutput )
{
        m_pAudioOutput = pAudioOutput;
}
 
 
 
} // namespace H2Core