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diff --git a/cinelerra-5.1/plugins/ivtc/ivtc.h b/cinelerra-5.1/plugins/ivtc/ivtc.h
new file mode 100644
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+++ b/cinelerra-5.1/plugins/ivtc/ivtc.h
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+
+/*
+ * CINELERRA
+ * Copyright (C) 2008 Adam Williams <broadcast at earthling dot net>
+ * 
+ * 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; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ * 
+ */
+
+#ifndef IVTC_H
+#define IVTC_H
+
+class IVTCMain;
+class IVTCEngine;
+
+#include "bchash.h"
+#include "loadbalance.h"
+#include "mutex.h"
+#include "pluginvclient.h"
+#include "ivtcwindow.h"
+#include <sys/types.h>
+
+class IVTCEngine;
+
+class IVTCConfig
+{
+public:
+	IVTCConfig();
+	int frame_offset;
+// 0 - even     1 - odd
+	int first_field;
+	int automatic;
+	float auto_threshold;
+	int pattern;
+	enum
+	{
+		PULLDOWN32,
+		SHIFTFIELD,
+		AUTOMATIC
+	};
+};
+
+class IVTCMain : public PluginVClient
+{
+public:
+	IVTCMain(PluginServer *server);
+	~IVTCMain();
+
+// required for all realtime plugins
+	int process_realtime(VFrame *input_ptr, VFrame *output_ptr);
+	int is_realtime();
+	void save_data(KeyFrame *keyframe);
+	void read_data(KeyFrame *keyframe);
+	PLUGIN_CLASS_MEMBERS(IVTCConfig)
+	void update_gui();
+	void render_stop();
+
+	void compare_fields(VFrame *frame1, 
+		VFrame *frame2, 
+		int64_t &field1,
+		int64_t &field2);
+	int64_t compare(VFrame *current_avg, 
+		VFrame *current_orig, 
+		VFrame *previous, 
+		int field);
+
+	void deinterlace_avg(VFrame *output, VFrame *input, int dominance);
+
+
+	VFrame *temp_frame[2];
+	VFrame *input, *output;
+
+// Automatic IVTC variables
+// Difference between averaged current even lines and original even lines
+	int64_t even_vs_current;
+// Difference between averaged current even lines and previous even lines
+	int64_t even_vs_prev;
+// Difference between averaged current odd lines and original odd lines
+	int64_t odd_vs_current;
+// Difference between averaged current odd lines and previous odd lines
+	int64_t odd_vs_prev;
+
+// Closest combination of fields in previous calculation.
+// If the lowest current combination is too big and the previous strategy
+// was direct copy, copy the previous frame.
+	int64_t previous_min;
+	int previous_strategy;
+	IVTCEngine *engine;
+};
+
+
+class IVTCPackage : public LoadPackage
+{
+public:
+	IVTCPackage();
+	int y1, y2;
+};
+
+class IVTCUnit : public LoadClient
+{
+public:
+	IVTCUnit(IVTCEngine *server, IVTCMain *plugin);
+	void process_package(LoadPackage *package);
+	void clear_totals();
+	IVTCEngine *server;
+	IVTCMain *plugin;
+	int64_t even_vs_current;
+	int64_t even_vs_prev;
+	int64_t odd_vs_current;
+	int64_t odd_vs_prev;
+};
+
+
+class IVTCEngine : public LoadServer
+{
+public:
+	IVTCEngine(IVTCMain *plugin, int cpus);
+	~IVTCEngine();
+	void init_packages();
+	LoadClient* new_client();
+	LoadPackage* new_package();
+	IVTCMain *plugin;
+};
+
+#endif