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diff --git a/cinelerra-5.1/cinelerra/messages.h b/cinelerra-5.1/cinelerra/messages.h
new file mode 100644
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+++ b/cinelerra-5.1/cinelerra/messages.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 MESSAGES_H
+#define MESSAGES_H
+
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/msg.h>
+
+#define MESSAGE_TO_PLUGIN 1
+#define MESSAGE_FROM_PLUGIN 2
+#include "messages.inc"
+
+class Messages
+{
+public:
+	Messages(int input_flag, int output_flag, int id = -1);
+	~Messages();
+
+	char* get_message_buffer();
+
+	int read_message(char *text);
+	char* read_message_raw();        // return the raw text in the buffer
+	int read_message(int *command, char *text);
+	long read_message();    // return the number contained in the message
+	int read_message(long *value1, long *value2);
+	int read_message(long *command, long *value1, long *value2);
+	int read_message(long *command, long *value1, long *value2, long *value3);
+	float read_message_f();
+	int read_message_f(float *value1, float *value2);
+	int read_message_f(float *value1, float *value2, float *value3);
+	int read_message_f(float *value1, float *value2, float *value3, float *value4);
+
+	int write_message(char *text);
+	int write_message_raw();                 // send the text currently in the buffer
+	int write_message(int command, char *text);
+	int write_message_flagged(int output_flag, int command);
+	int write_message(int number);
+	int write_message(long command, long value);
+	int write_message(long command, long value1, long value2);
+	int write_message(long command, long value1, long value2, long value3);
+	int write_message_f(float number);
+	int write_message_f(float value1, float value2);
+	int write_message_f(float value1, float value2, float value3);
+	int write_message_f(float value1, float value2, float value3, float value4);
+	int get_id();
+
+	int msgid;
+	int client;
+	int input_flag;
+	int output_flag;
+	struct buffer_ {
+		long mtype;
+		char text[MESSAGESIZE];
+	} buffer;
+};
+
+#endif