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diff --git a/libavcodec/sgi.h b/libavcodec/sgi.h
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+ /*
+ * SGI image encoder
+ * Xiaohui Sun <tjnksxh@hotmail.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef SGI_H
+#define SGI_H
+
+/**
+ * SGI image file signature
+ */
+#define SGI_MAGIC 474
+
+#define SGI_HEADER_SIZE 512
+
+#define SGI_GRAYSCALE 1
+#define SGI_RGB 3
+#define SGI_RGBA 4
+
+#endif
+