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diff --git a/extern/libmv/intern/frame_accessor.h b/extern/libmv/intern/frame_accessor.h
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+++ b/extern/libmv/intern/frame_accessor.h
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+/*
+ * ***** 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.
+ *
+ * The Original Code is Copyright (C) 2014 Blender Foundation.
+ * All rights reserved.
+ *
+ * Contributor(s): Blender Foundation,
+ *                 Sergey Sharybin
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#ifndef LIBMV_C_API_FRAME_ACCESSOR_H_
+#define LIBMV_C_API_FRAME_ACCESSOR_H_
+
+#include <stdint.h>
+
+#include "intern/image.h"
+#include "intern/region.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct libmv_FrameAccessor libmv_FrameAccessor;
+typedef struct libmv_FrameTransform libmv_FrameTransform;
+typedef struct libmv_FrameAccessorUserData libmv_FrameAccessorUserData;
+typedef void *libmv_CacheKey;
+
+typedef enum {
+  LIBMV_IMAGE_MODE_MONO,
+  LIBMV_IMAGE_MODE_RGBA,
+} libmv_InputMode;
+
+typedef libmv_CacheKey (*libmv_GetImageCallback) (
+    libmv_FrameAccessorUserData* user_data,
+    int clip,
+    int frame,
+    libmv_InputMode input_mode,
+    int downscale,
+    const libmv_Region* region,
+    const libmv_FrameTransform* transform,
+    float** destination,
+    int* width,
+    int* height,
+    int* channels);
+
+typedef void (*libmv_ReleaseImageCallback) (libmv_CacheKey cache_key);
+
+libmv_FrameAccessor* libmv_FrameAccessorNew(
+    libmv_FrameAccessorUserData* user_data,
+    libmv_GetImageCallback get_image_callback,
+    libmv_ReleaseImageCallback release_image_callback);
+void libmv_FrameAccessorDestroy(libmv_FrameAccessor* frame_accessor);
+
+int64_t libmv_frameAccessorgetTransformKey(const libmv_FrameTransform *transform);
+
+void libmv_frameAccessorgetTransformRun(const libmv_FrameTransform *transform,
+                                        const libmv_FloatImage *input_image,
+                                        libmv_FloatImage *output_image);
+#ifdef __cplusplus
+}
+#endif
+
+#endif  // LIBMV_C_API_FRAME_ACCESSOR_H_