mirror of
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3c7bfbac64
This prevents a race condition with Qt5. A foreach loop makes a copy of its Qt container, increasing the reference count to the container's internal data. Qt5 often asserts isDetached(), which requires the reference count to be <= 1. This assertion fails when the foreach loop increases the reference count at exactly the wrong moment. Using a range-based for loop prevents an unnecessary copy from being made and ensures this race condition isn't triggered.
184 lines
4.4 KiB
C++
184 lines
4.4 KiB
C++
/*
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* MidiExport.cpp - support for importing MIDI files
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*
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* Author: Mohamed Abdel Maksoud <mohamed at amaksoud.com>
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*
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* This file is part of LMMS - http://lmms.io
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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 <QDomDocument>
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#include <QDir>
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#include <QApplication>
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#include <QMessageBox>
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#include <QProgressDialog>
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#include "MidiExport.h"
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#include "Engine.h"
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#include "TrackContainer.h"
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#include "InstrumentTrack.h"
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extern "C"
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{
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Plugin::Descriptor PLUGIN_EXPORT midiexport_plugin_descriptor =
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{
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STRINGIFY( PLUGIN_NAME ),
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"MIDI Export",
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QT_TRANSLATE_NOOP( "pluginBrowser",
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"Filter for exporting MIDI-files from LMMS" ),
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"Mohamed Abdel Maksoud <mohamed at amaksoud.com>",
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0x0100,
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Plugin::ExportFilter,
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NULL,
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NULL,
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NULL
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} ;
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}
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MidiExport::MidiExport() : ExportFilter( &midiexport_plugin_descriptor)
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{
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}
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MidiExport::~MidiExport()
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{
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}
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bool MidiExport::tryExport( const TrackContainer::TrackList &tracks, int tempo, const QString &filename )
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{
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QFile f(filename);
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f.open(QIODevice::WriteOnly);
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QDataStream midiout(&f);
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InstrumentTrack* instTrack;
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QDomElement element;
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int nTracks = 0;
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const int BUFFER_SIZE = 50*1024;
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uint8_t buffer[BUFFER_SIZE];
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uint32_t size;
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for( const Track* track : tracks ) if( track->type() == Track::InstrumentTrack ) nTracks++;
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// midi header
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MidiFile::MIDIHeader header(nTracks);
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size = header.writeToBuffer(buffer);
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midiout.writeRawData((char *)buffer, size);
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// midi tracks
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for( Track* track : tracks )
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{
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DataFile dataFile( DataFile::SongProject );
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MidiFile::MIDITrack<BUFFER_SIZE> mtrack;
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if( track->type() != Track::InstrumentTrack ) continue;
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//qDebug() << "exporting " << track->name();
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mtrack.addName(track->name().toStdString(), 0);
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//mtrack.addProgramChange(0, 0);
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mtrack.addTempo(tempo, 0);
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instTrack = dynamic_cast<InstrumentTrack *>( track );
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element = instTrack->saveState( dataFile, dataFile.content() );
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// instrumentTrack
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// - instrumentTrack
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// - pattern
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int base_pitch = 0;
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double base_volume = 1.0;
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int base_time = 0;
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for(QDomNode n = element.firstChild(); !n.isNull(); n = n.nextSibling())
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{
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//QDomText txt = n.toText();
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//qDebug() << ">> child node " << n.nodeName();
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if (n.nodeName() == "instrumenttrack")
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{
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// TODO interpret pan="0" fxch="0" usemasterpitch="1" pitchrange="1" pitch="0" basenote="57"
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QDomElement it = n.toElement();
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base_pitch = it.attribute("pitch", "0").toInt();
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base_volume = it.attribute("volume", "100").toDouble()/100.0;
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}
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if (n.nodeName() == "pattern")
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{
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base_time = n.toElement().attribute("pos", "0").toInt();
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// TODO interpret steps="12" muted="0" type="1" name="Piano1" len="2592"
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for(QDomNode nn = n.firstChild(); !nn.isNull(); nn = nn.nextSibling())
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{
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QDomElement note = nn.toElement();
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if (note.attribute("len", "0") == "0" || note.attribute("vol", "0") == "0") continue;
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#if 0
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qDebug() << ">>>> key " << note.attribute( "key", "0" )
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<< " " << note.attribute("len", "0") << " @"
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<< note.attribute("pos", "0");
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#endif
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mtrack.addNote(
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note.attribute("key", "0").toInt()+base_pitch
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, 100 * base_volume * (note.attribute("vol", "100").toDouble()/100)
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, (base_time+note.attribute("pos", "0").toDouble())/48
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, (note.attribute("len", "0")).toDouble()/48);
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}
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}
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}
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size = mtrack.writeToBuffer(buffer);
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midiout.writeRawData((char *)buffer, size);
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} // for each track
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return true;
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}
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void MidiExport::error()
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{
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//qDebug() << "MidiExport error: " << m_error ;
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}
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extern "C"
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{
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// necessary for getting instance out of shared lib
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Plugin * PLUGIN_EXPORT lmms_plugin_main( Model *, void * _data )
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{
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return new MidiExport();
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}
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}
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