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diff --git a/source/blender/imbuf/intern/IMB_indexer.h b/source/blender/imbuf/intern/IMB_indexer.h
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+/**
+ * $Id$
+ *
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ *
+ * Contributor(s): Peter Schlaile
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+
+#ifndef IMB_INDEXER_H
+#define IMB_INDEXER_H
+
+#ifdef WIN32
+#include <io.h>
+#endif
+
+#include <stdlib.h>
+#include <stdio.h>
+#include "BKE_utildefines.h"
+#include "IMB_anim.h"
+
+/*
+  seperate animation index files to solve the following problems:
+
+  a) different timecodes within one file (like DTS/PTS, Timecode-Track, 
+     "implicit" timecodes within DV-files and HDV-files etc.)
+  b) seeking difficulties within ffmpeg for files with timestamp holes
+  c) broken files that miss several frames / have varying framerates
+  d) use proxies accordingly
+
+  ... we need index files, that provide us with 
+  
+  the binary(!) position, where we have to seek into the file *and*
+  the continuous frame number (ignoring the holes) starting from the 
+  beginning of the file, so that we know, which proxy frame to serve.
+
+  This index has to be only built once for a file and is written into
+  the BL_proxy directory structure for later reuse in different blender files.
+
+*/
+
+typedef struct anim_index_entry {
+	int frameno;
+	unsigned long long seek_pos;
+	unsigned long long seek_pos_dts;
+	unsigned long long pts;
+} anim_index_entry;
+
+struct anim_index {
+	char name[256];
+
+	int num_entries;
+	struct anim_index_entry * entries;
+};
+
+struct anim_index_builder;
+
+typedef struct anim_index_builder {
+	FILE * fp;
+	char name[FILE_MAXDIR + FILE_MAXFILE];
+	char temp_name[FILE_MAXDIR + FILE_MAXFILE];
+
+	void * private_data;
+
+	void (*delete_priv_data)(struct anim_index_builder * idx);
+	void (*proc_frame)(struct anim_index_builder * idx, 
+			   unsigned char * buffer,
+			   int data_size, 
+			   struct anim_index_entry * entry);
+} anim_index_builder;
+
+anim_index_builder * IMB_index_builder_create(const char * name);
+void IMB_index_builder_add_entry(anim_index_builder * fp, 
+				 int frameno, unsigned long long seek_pos,
+				 unsigned long long seek_pos_dts,
+				 unsigned long long pts);
+
+void IMB_index_builder_proc_frame(anim_index_builder * fp, 
+				  unsigned char * buffer,
+				  int data_size,
+				  int frameno, unsigned long long seek_pos,
+				  unsigned long long seek_pos_dts,
+				  unsigned long long pts);
+
+void IMB_index_builder_finish(anim_index_builder * fp, int rollback);
+
+struct anim_index * IMB_indexer_open(const char * name);
+unsigned long long IMB_indexer_get_seek_pos(
+	struct anim_index * idx, int frameno_index);
+unsigned long long IMB_indexer_get_seek_pos_dts(
+	struct anim_index * idx, int frameno_index);
+
+int IMB_indexer_get_frame_index(struct anim_index * idx, int frameno);
+unsigned long long IMB_indexer_get_pts(struct anim_index * idx, 
+				       int frame_index);
+int IMB_indexer_get_duration(struct anim_index * idx);
+
+int IMB_indexer_can_scan(struct anim_index * idx, 
+			 int old_frame_index, int new_frame_index);
+
+void IMB_indexer_close(struct anim_index * idx);
+
+void IMB_free_indices(struct anim * anim);
+
+int IMB_anim_index_get_frame_index(
+	struct anim * anim, IMB_Timecode_Type tc, int position);
+
+struct anim * IMB_anim_open_proxy(
+	struct anim * anim, IMB_Proxy_Size preview_size);
+struct anim_index * IMB_anim_open_index(
+	struct anim * anim, IMB_Timecode_Type tc);
+
+int IMB_proxy_size_to_array_index(IMB_Proxy_Size pr_size);
+int IMB_timecode_to_array_index(IMB_Timecode_Type tc);
+
+#endif