107 lines
2.9 KiB
C++
107 lines
2.9 KiB
C++
/*********************************************************************************/
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/*!
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@file Merge.cpp
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@brief Merge MIDI Events from multiple streams into a single stream.
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@author L. J. Barman
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Copyright (c) 2008-2013, L. J. Barman, all rights reserved
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This file is part of the PianoBooster application
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PianoBooster is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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PianoBooster 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with PianoBooster. If not, see <http://www.gnu.org/licenses/>.
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*/
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/////////////////////////////////////////////////////////////////////////////
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#include "Merge.h"
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void CMerge::initMergedEvents()
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{
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int i;
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for( i = 0; i < m_mergeEvents.size(); i++)
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{
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m_mergeEvents[i].clear();
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if (checkMidiEventFromStream(i) )
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m_mergeEvents[i] = fetchMidiEventFromStream(i);
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}
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}
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int CMerge::nextMergedEvent()
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{
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int nearestIndex = 0;
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int i;
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CMidiEvent* nearestEvent;
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int deltaTime;
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nearestEvent = nullptr;
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// find the first active slot
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for( i = 0; i < m_mergeEvents.size(); i++)
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{
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if (m_mergeEvents[i].type() != MIDI_NONE)
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{
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nearestEvent = &m_mergeEvents[i];
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nearestIndex = i;
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break;
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}
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}
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if (nearestEvent == nullptr)
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return 0;
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// now search the remaining active slots
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for( i = nearestIndex + 1; i < m_mergeEvents.size(); i++)
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{
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if (m_mergeEvents[i].type() != MIDI_NONE)
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{
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// find the slot with the lowest delta time
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if (m_mergeEvents[i].deltaTime() < nearestEvent->deltaTime())
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{
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nearestEvent = &m_mergeEvents[i];
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nearestIndex = i;
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}
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}
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}
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deltaTime = -nearestEvent->deltaTime();
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// Now subtract the delta time from all the others
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for( i = 0; i < m_mergeEvents.size(); i++)
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{
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if (i == nearestIndex)
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continue;
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if (m_mergeEvents[i].type() != MIDI_NONE)
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m_mergeEvents[i].addDeltaTime( deltaTime );
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}
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return nearestIndex;
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}
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CMidiEvent CMerge::readMidiEvent()
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{
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int mergeIdx;
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CMidiEvent event;
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mergeIdx = nextMergedEvent();
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event = m_mergeEvents[mergeIdx];
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m_mergeEvents[mergeIdx].clear();
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if (checkMidiEventFromStream(mergeIdx) )
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m_mergeEvents[mergeIdx] = fetchMidiEventFromStream(mergeIdx);
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if (event.type() == MIDI_NONE)
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event.setType(MIDI_PB_EOF);
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return event;
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}
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