MIDI Export feature (issue #258)

include/ExportFilter.h

@@ -0,0 +1,64 @@
+/*
+ * ExportFilter.h - declaration of class ExportFilter, the base-class for all
+ *                  file export filters
+ *
+ * Copyright (c) 2006-2014 Tobias Doerffel <tobydox/at/users.sourceforge.net>
+ *
+ * This file is part of LMMS - http://lmms.io
+ *
+ * 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 EXPORT_FILTER_H
+#define EXPORT_FILTER_H
+
+#include <QtCore/QFile>
+
+#include "TrackContainer.h"
+#include "Plugin.h"
+
+
+class EXPORT ExportFilter : public Plugin
+{
+public:
+	ExportFilter( const Descriptor * _descriptor ) : Plugin( _descriptor, NULL ) {}
+	virtual ~ExportFilter() {}
+
+
+	virtual bool tryExport( const TrackContainer::TrackList &tracks, int tempo, const QString &filename ) = 0;
+protected:
+
+	virtual void saveSettings( QDomDocument &, QDomElement & )
+	{
+	}
+
+	virtual void loadSettings( const QDomElement & )
+	{
+	}
+
+	virtual QString nodeName() const
+	{
+		return "import_filter";
+	}
+
+
+private:
+
+} ;
+
+
+#endif

plugins/MidiExport/CMakeLists.txt

@@ -0,0 +1,4 @@
+INCLUDE(BuildPlugin)
+
+BUILD_PLUGIN(midiexport MidiExport.cpp MidiExport.h MidiFile.hpp
+		MOCFILES MidiExport.h)

plugins/MidiExport/MidiExport.cpp

@@ -0,0 +1,183 @@
+/*
+ * MidiExport.cpp - support for importing MIDI files
+ *
+ * Author: Mohamed Abdel Maksoud <mohamed at amaksoud.com>
+ *
+ * This file is part of LMMS - http://lmms.io
+ * 
+ * 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.
+ *
+ */
+
+
+#include <QDomDocument>
+#include <QDir>
+#include <QApplication>
+#include <QMessageBox>
+#include <QProgressDialog>
+
+#include "MidiExport.h"
+#include "Engine.h"
+#include "TrackContainer.h"
+#include "InstrumentTrack.h"
+
+
+extern "C"
+{
+
+Plugin::Descriptor PLUGIN_EXPORT midiexport_plugin_descriptor =
+{
+	STRINGIFY( PLUGIN_NAME ),
+	"MIDI Export",
+	QT_TRANSLATE_NOOP( "pluginBrowser",
+				"Filter for exporting MIDI-files from LMMS" ),
+	"Mohamed Abdel Maksoud <mohamed at amaksoud.com>",
+	0x0100,
+	Plugin::ExportFilter,
+	NULL,
+	NULL,
+	NULL
+} ;
+
+}
+
+
+MidiExport::MidiExport() : ExportFilter( &midiexport_plugin_descriptor)
+{
+}
+
+
+
+
+MidiExport::~MidiExport()
+{
+}
+
+
+
+bool MidiExport::tryExport( const TrackContainer::TrackList &tracks, int tempo, const QString &filename  )
+{
+	QFile f(filename);
+	f.open(QIODevice::WriteOnly);
+	QDataStream midiout(&f);
+
+	InstrumentTrack* instTrack;
+	QDomElement element;
+
+
+	int nTracks = 0;
+	const int BUFFER_SIZE = 50*1024;
+	uint8_t buffer[BUFFER_SIZE];
+	uint32_t size;
+
+	foreach( Track* track, tracks ) if( track->type() == Track::InstrumentTrack ) nTracks++;
+
+	// midi header
+	MidiFile::MIDIHeader header(nTracks);
+	size = header.writeToBuffer(buffer);
+	midiout.writeRawData((char *)buffer, size);
+
+	// midi tracks
+	foreach( Track* track, tracks )
+	{
+		DataFile dataFile( DataFile::SongProject );
+		MidiFile::MIDITrack<BUFFER_SIZE> mtrack;
+
+		if( track->type() != Track::InstrumentTrack ) continue;
+
+		//qDebug() << "exporting " << track->name();
+
+
+		mtrack.addName(track->name().toStdString(), 0);
+		//mtrack.addProgramChange(0, 0);
+		mtrack.addTempo(tempo, 0);
+
+		instTrack = dynamic_cast<InstrumentTrack *>( track );
+		element = instTrack->saveState( dataFile, dataFile.content() );
+
+		// instrumentTrack
+		//     - instrumentTrack
+		//     - pattern
+		int   base_pitch   = 0;
+		double base_volume = 1.0;
+		int    base_time = 0;
+
+
+		for(QDomNode n = element.firstChild(); !n.isNull(); n = n.nextSibling())
+		{
+			//QDomText txt = n.toText();
+			//qDebug() << ">> child node " << n.nodeName();
+
+			if (n.nodeName() == "instrumenttrack")
+			{
+				// TODO interpret pan="0" fxch="0" usemasterpitch="1" pitchrange="1" pitch="0" basenote="57"
+				QDomElement it = n.toElement();
+				base_pitch  = it.attribute("pitch", "0").toInt();
+				base_volume = it.attribute("volume", "100").toDouble()/100.0;
+			}
+
+			if (n.nodeName() == "pattern")
+			{
+				base_time = n.toElement().attribute("pos", "0").toInt();
+				// TODO interpret steps="12" muted="0" type="1" name="Piano1"  len="2592"
+				for(QDomNode nn = n.firstChild(); !nn.isNull(); nn = nn.nextSibling())
+				{
+					QDomElement note = nn.toElement();
+					if (note.attribute("len", "0") == "0" || note.attribute("vol", "0") == "0") continue;
+					#if 0
+					qDebug() << ">>>> key " << note.attribute( "key", "0" ) 
+						<< " " << note.attribute("len", "0") << " @" 
+						<< note.attribute("pos", "0");
+					#endif
+					mtrack.addNote(
+						note.attribute("key", "0").toInt()+base_pitch
+						, 100 * base_volume * (note.attribute("vol", "100").toDouble()/100)
+						, (base_time+note.attribute("pos", "0").toDouble())/48
+						, (note.attribute("len", "0")).toDouble()/48);
+				}
+			}
+
+		}
+		size = mtrack.writeToBuffer(buffer);
+		midiout.writeRawData((char *)buffer, size);
+	} // for each track
+
+	return true;
+
+}
+
+
+
+
+void MidiExport::error()
+{
+	//qDebug() << "MidiExport error: " << m_error ;
+}
+
+
+
+extern "C"
+{
+
+// necessary for getting instance out of shared lib
+Plugin * PLUGIN_EXPORT lmms_plugin_main( Model *, void * _data )
+{
+	return new MidiExport();
+}
+
+
+}
+

plugins/MidiExport/MidiExport.h

@@ -0,0 +1,58 @@
+/*
+ * MidiExport.h - support for Exporting MIDI-files
+ *
+ * Author: Mohamed Abdel Maksoud <mohamed at amaksoud.com>
+ *
+ * This file is part of LMMS - http://lmms.io
+ *
+ * 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 _MIDI_EXPORT_H
+#define _MIDI_EXPORT_H
+
+#include <QString>
+
+#include "ExportFilter.h"
+#include "MidiFile.hpp"
+
+
+
+class MidiExport: public ExportFilter
+{
+// 	Q_OBJECT
+public:
+	MidiExport( );
+	~MidiExport();
+
+	virtual PluginView * instantiateView( QWidget * )
+	{
+		return( NULL );
+	}
+
+	virtual bool tryExport( const TrackContainer::TrackList &tracks, int tempo, const QString &filename );
+
+private:
+
+
+	void error( void );
+
+
+} ;
+
+
+#endif