Initial implementation of RenderManager.

Much of the multi-track rendering logic was intermixed with GUI code in
ExportProjectDialog.

This creates the RenderManager class to provide rendering logic that could be
shared between the CLI and GUI interfaces.

include/RenderManager.h

@@ -0,0 +1,76 @@
+/*
+ * RenderManager.h - Provides a uniform interface for rendering the project or
+ *                   individual tracks for the CLI and GUI.
+ *
+ * Copyright (c) 2015 Ryan Roden-Corrent <ryan/at/rcorre.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 RENDER_MANAGER_H
+#define RENDER_MANAGER_H
+
+#include <vector>
+
+#include "ProjectRenderer.h"
+
+class RenderManager : public QObject
+{
+	Q_OBJECT
+public:
+	RenderManager(
+		const Mixer::qualitySettings & qualitySettings,
+		const ProjectRenderer::OutputSettings & outputSettings,
+		ProjectRenderer::ExportFileFormats fmt,
+		QString outputPath);
+
+	virtual ~RenderManager();
+
+	/// Export all unmuted tracks into a single file
+	void renderProject();
+
+	/// Export all unmuted tracks into individual file
+	void renderTracks();
+
+	void abortProcessing();
+
+signals:
+	void progressChanged( int );
+	void finished();
+
+private slots:
+	void renderNextTrack();
+	void updateConsoleProgress();
+
+private:
+	QString pathForTrack( const Track *track, int num );
+	void restoreMutedState();
+
+	const Mixer::qualitySettings m_qualitySettings;
+	const ProjectRenderer::OutputSettings m_outputSettings;
+	ProjectRenderer::ExportFileFormats m_format;
+	QString m_outputPath;
+
+	ProjectRenderer* m_activeRenderer;
+
+	QVector<Track*> m_tracksToRender;
+	QVector<Track*> m_unmuted;
+} ;
+
+#endif