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diff --git a/src/motion_vector.h b/src/motion_vector.h
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+/*
+ * Copyright 2019 The libgav1 Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LIBGAV1_SRC_MOTION_VECTOR_H_
+#define LIBGAV1_SRC_MOTION_VECTOR_H_
+
+#include <algorithm>
+#include <array>
+#include <cstdint>
+
+#include "src/buffer_pool.h"
+#include "src/obu_parser.h"
+#include "src/tile.h"
+#include "src/utils/array_2d.h"
+#include "src/utils/constants.h"
+#include "src/utils/types.h"
+
+namespace libgav1 {
+
+constexpr bool IsGlobalMvBlock(bool is_global_mv_block,
+                               GlobalMotionTransformationType type) {
+  return is_global_mv_block &&
+         type > kGlobalMotionTransformationTypeTranslation;
+}
+
+// The |contexts| output parameter may be null. If the caller does not need
+// the |contexts| output, pass nullptr as the argument.
+void FindMvStack(const Tile::Block& block, bool is_compound,
+                 MvContexts* contexts);  // 7.10.2
+
+void FindWarpSamples(const Tile::Block& block, int* num_warp_samples,
+                     int* num_samples_scanned,
+                     int candidates[kMaxLeastSquaresSamples][4]);  // 7.10.4.
+
+// Section 7.9.1 in the spec. But this is done per tile instead of for the whole
+// frame.
+void SetupMotionField(
+    const ObuFrameHeader& frame_header, const RefCountedBuffer& current_frame,
+    const std::array<RefCountedBufferPtr, kNumReferenceFrameTypes>&
+        reference_frames,
+    int row4x4_start, int row4x4_end, int column4x4_start, int column4x4_end,
+    TemporalMotionField* motion_field);
+
+}  // namespace libgav1
+
+#endif  // LIBGAV1_SRC_MOTION_VECTOR_H_