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https://github.com/LMMS/lmms.git
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270af579b8
Change in handling of frameoffset for multistreamed instruments and sampletracks. - Instead of holding the offset for the lifetime of the playhandle, negate the offset in the first period - Multistream-instruments require some small changes: they have to now check for the offset and accordingly leave empty space in the start of the period (already done in this commit) - There are possibly optimizations that can be done later - This change is necessary so that we can have sample-exact models, and sample-exact vol/pan knobs for all instruments. Earlier multistream instruments were always rendering some frames ahead-of-time, so applying sample-exact data for them would have been impossible, since we don't have the future-values yet...
120 lines
2.4 KiB
C++
120 lines
2.4 KiB
C++
/*
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* PlayHandle.h - base class PlayHandle - core of rendering engine
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*
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* Copyright (c) 2004-2014 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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#ifndef PLAY_HANDLE_H
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#define PLAY_HANDLE_H
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#include <QtCore/QThread>
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#include <QtCore/QVector>
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#include "ThreadableJob.h"
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#include "lmms_basics.h"
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class track;
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class PlayHandle : public ThreadableJob
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{
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public:
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enum Types
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{
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TypeNotePlayHandle,
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TypeInstrumentPlayHandle,
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TypeSamplePlayHandle,
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TypePresetPreviewHandle,
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TypeCount
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} ;
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typedef Types Type;
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PlayHandle( const Type type, f_cnt_t offset = 0 ) :
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m_type( type ),
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m_offset( offset ),
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m_affinity( QThread::currentThread() )
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{
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}
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virtual ~PlayHandle()
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{
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}
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virtual bool affinityMatters() const
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{
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return false;
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}
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const QThread* affinity() const
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{
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return m_affinity;
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}
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Type type() const
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{
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return m_type;
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}
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// required for ThreadableJob
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virtual void doProcessing( sampleFrame* buffer )
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{
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play( buffer );
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}
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virtual bool requiresProcessing() const
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{
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return !isFinished();
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}
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virtual void play( sampleFrame* buffer ) = 0;
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virtual bool isFinished( void ) const = 0;
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// returns the frameoffset at the start of the playhandle,
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// ie. how many empty frames should be inserted at the start of the first period
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f_cnt_t offset() const
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{
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return m_offset;
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}
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void setOffset( f_cnt_t _offset )
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{
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m_offset = _offset;
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}
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virtual bool isFromTrack( const track * _track ) const = 0;
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private:
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Type m_type;
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f_cnt_t m_offset;
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const QThread* m_affinity;
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} ;
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typedef QList<PlayHandle *> PlayHandleList;
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typedef QList<const PlayHandle *> ConstPlayHandleList;
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#endif
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