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diff --git a/third_party/aom/av1/encoder/tune_vmaf.h b/third_party/aom/av1/encoder/tune_vmaf.h
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+++ b/third_party/aom/av1/encoder/tune_vmaf.h
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+/*
+ * Copyright (c) 2019, Alliance for Open Media. All rights reserved
+ *
+ * This source code is subject to the terms of the BSD 2 Clause License and
+ * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+ * was not distributed with this source code in the LICENSE file, you can
+ * obtain it at www.aomedia.org/license/software. If the Alliance for Open
+ * Media Patent License 1.0 was not distributed with this source code in the
+ * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+ */
+
+#ifndef AOM_AV1_ENCODER_TUNE_VMAF_H_
+#define AOM_AV1_ENCODER_TUNE_VMAF_H_
+
+#include "aom_dsp/vmaf.h"
+#include "aom_scale/yv12config.h"
+#include "av1/common/enums.h"
+#include "av1/encoder/ratectrl.h"
+#include "av1/encoder/block.h"
+
+typedef struct {
+  // Stores the scaling factors for rdmult when tuning for VMAF.
+  // rdmult_scaling_factors[row * num_cols + col] stores the scaling factors for
+  // 64x64 block at (row, col).
+  double *rdmult_scaling_factors;
+
+  // Stores the luma sse of the last frame.
+  double last_frame_ysse[MAX_ARF_LAYERS];
+
+  // Stores the VMAF of the last frame.
+  double last_frame_vmaf[MAX_ARF_LAYERS];
+
+  // Stores the filter strength of the last frame.
+  double last_frame_unsharp_amount[MAX_ARF_LAYERS];
+
+  // Stores the origial qindex before scaling.
+  int original_qindex;
+
+  // VMAF model used in VMAF caculations.
+  VmafModel *vmaf_model;
+} TuneVMAFInfo;
+
+struct AV1_COMP;
+
+void av1_vmaf_blk_preprocessing(struct AV1_COMP *cpi,
+                                YV12_BUFFER_CONFIG *source);
+
+void av1_vmaf_frame_preprocessing(struct AV1_COMP *cpi,
+                                  YV12_BUFFER_CONFIG *source);
+
+void av1_vmaf_neg_preprocessing(struct AV1_COMP *cpi,
+                                YV12_BUFFER_CONFIG *source);
+
+void av1_set_mb_vmaf_rdmult_scaling(struct AV1_COMP *cpi);
+
+void av1_set_vmaf_rdmult(const struct AV1_COMP *cpi, MACROBLOCK *x,
+                         BLOCK_SIZE bsize, int mi_row, int mi_col, int *rdmult);
+
+int av1_get_vmaf_base_qindex(const struct AV1_COMP *cpi, int current_qindex);
+
+void av1_update_vmaf_curve(struct AV1_COMP *cpi);
+
+#endif  // AOM_AV1_ENCODER_TUNE_VMAF_H_