mirror of
https://github.com/LMMS/lmms.git
synced 2026-01-25 23:08:12 -05:00
f39c9641ab
git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@1103 0778d3d1-df1d-0410-868b-ea421aaaa00d
141 lines
4.3 KiB
C++
141 lines
4.3 KiB
C++
/*
|
|
* instrument.h - declaration of class instrument, which provides a
|
|
* standard interface for all instrument plugins
|
|
*
|
|
* Copyright (c) 2005-2008 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 _INSTRUMENT_H
|
|
#define _INSTRUMENT_H
|
|
|
|
#include <QtGui/QWidget>
|
|
|
|
#include "plugin.h"
|
|
#include "mixer.h"
|
|
|
|
|
|
// forward-declarations
|
|
class instrumentTrack;
|
|
class instrumentView;
|
|
class midiEvent;
|
|
class midiTime;
|
|
class notePlayHandle;
|
|
class track;
|
|
|
|
|
|
class EXPORT instrument : public plugin
|
|
{
|
|
public:
|
|
instrument( instrumentTrack * _instrument_track,
|
|
const descriptor * _descriptor );
|
|
virtual ~instrument();
|
|
|
|
// --------------------------------------------------------------------
|
|
// functions that can/should be re-implemented:
|
|
// --------------------------------------------------------------------
|
|
|
|
// if the plugin doesn't play each note, it can create an instrument-
|
|
// play-handle and re-implement this method, so that it mixes its
|
|
// output buffer only once per mixer-period
|
|
virtual void play( bool _try_parallelizing,
|
|
sampleFrame * _working_buffer );
|
|
|
|
// to be implemented by actual plugin
|
|
virtual void playNote( notePlayHandle * _note_to_play,
|
|
bool _try_parallelizing,
|
|
sampleFrame * _working_buf ) = 0;
|
|
|
|
// needed for deleting plugin-specific-data of a note - plugin has to
|
|
// cast void-ptr so that the plugin-data is deleted properly
|
|
// (call of dtor if it's a class etc.)
|
|
virtual void deleteNotePluginData( notePlayHandle * _note_to_play );
|
|
|
|
// Get number of sample-frames that should be used when playing beat
|
|
// (note with unspecified length)
|
|
// Per default this function returns 0. In this case, channel is using
|
|
// the length of the longest envelope (if one active).
|
|
virtual f_cnt_t beatLen( notePlayHandle * _n ) const;
|
|
|
|
|
|
// some instruments need a certain number of release-frames even
|
|
// if no envelope is active - such instruments can re-implement this
|
|
// method for returning how many frames they at least like to have for
|
|
// release
|
|
virtual f_cnt_t desiredReleaseFrames( void ) const
|
|
{
|
|
return( 0 );
|
|
}
|
|
|
|
// monophonic instruments can re-implement this indicate that they do
|
|
// not allow more then one note being played at the same time
|
|
virtual bool isMonophonic( void ) const
|
|
{
|
|
return( FALSE );
|
|
}
|
|
|
|
// instrument-play-handle-based instruments should return FALSE
|
|
inline virtual bool notePlayHandleBased( void ) const
|
|
{
|
|
return( TRUE );
|
|
}
|
|
|
|
// sub-classes can re-implement this for receiving all incoming
|
|
// MIDI-events except NoteOn and NoteOff
|
|
inline virtual bool handleMidiEvent( const midiEvent & _me,
|
|
const midiTime & _time )
|
|
{
|
|
return( FALSE );
|
|
}
|
|
|
|
virtual QString fullDisplayName( void ) const;
|
|
|
|
// --------------------------------------------------------------------
|
|
// provided functions:
|
|
// --------------------------------------------------------------------
|
|
|
|
// instantiate instrument-plugin with given name or return NULL
|
|
// on failure
|
|
static instrument * instantiate( const QString & _plugin_name,
|
|
instrumentTrack * _instrument_track );
|
|
|
|
virtual bool isFromTrack( const track * _track ) const;
|
|
|
|
|
|
protected:
|
|
inline instrumentTrack * getInstrumentTrack( void ) const
|
|
{
|
|
return( m_instrumentTrack );
|
|
}
|
|
|
|
// instruments may use this to apply a soft fade out at the end of
|
|
// notes - method does this only if really less or equal
|
|
// desiredReleaseFrames() frames are left
|
|
void applyRelease( sampleFrame * buf, const notePlayHandle * _n );
|
|
|
|
private:
|
|
instrumentTrack * m_instrumentTrack;
|
|
|
|
} ;
|
|
|
|
|
|
#endif
|