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diff --git a/third_party/aom/aom_dsp/noise_util.h b/third_party/aom/aom_dsp/noise_util.h
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+/*
+ * Copyright (c) 2017, 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_AOM_DSP_NOISE_UTIL_H_
+#define AOM_AOM_DSP_NOISE_UTIL_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif  // __cplusplus
+
+// aom_noise_tx_t is an abstraction of a transform that is used for denoising.
+// It is meant to be lightweight and does hold the transformed data (as
+// the user should not be manipulating the transformed data directly).
+struct aom_noise_tx_t;
+
+// Allocates and returns a aom_noise_tx_t useful for denoising the given
+// block_size. The resulting aom_noise_tx_t should be free'd with
+// aom_noise_tx_free.
+struct aom_noise_tx_t *aom_noise_tx_malloc(int block_size);
+void aom_noise_tx_free(struct aom_noise_tx_t *aom_noise_tx);
+
+// Transforms the internal data and holds it in the aom_noise_tx's internal
+// buffer. For compatibility with existing SIMD implementations, "data" must
+// be 32-byte aligned.
+void aom_noise_tx_forward(struct aom_noise_tx_t *aom_noise_tx,
+                          const float *data);
+
+// Filters aom_noise_tx's internal data using the provided noise power spectral
+// density. The PSD must be at least block_size * block_size and should be
+// populated with a constant or via estimates taken from
+// aom_noise_tx_add_energy.
+void aom_noise_tx_filter(struct aom_noise_tx_t *aom_noise_tx, const float *psd);
+
+// Performs an inverse transform using the internal transform data.
+// For compatibility with existing SIMD implementations, "data" must be 32-byte
+// aligned.
+void aom_noise_tx_inverse(struct aom_noise_tx_t *aom_noise_tx, float *data);
+
+// Aggregates the power of the buffered transform data into the psd buffer.
+void aom_noise_tx_add_energy(const struct aom_noise_tx_t *aom_noise_tx,
+                             float *psd);
+
+// Returns a default value suitable for denosing a transform of the given
+// block_size. The noise "factor" determines the strength of the noise to
+// be removed. A value of about 2.5 can be used for moderate denoising,
+// where a value of 5.0 can be used for a high level of denoising.
+float aom_noise_psd_get_default_value(int block_size, float factor);
+
+// Computes normalized cross correlation of two vectors a and b of length n.
+double aom_normalized_cross_correlation(const double *a, const double *b,
+                                        int n);
+
+// Validates the correlated noise in the data buffer of size (w, h).
+int aom_noise_data_validate(const double *data, int w, int h);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif  // __cplusplus
+
+#endif  // AOM_AOM_DSP_NOISE_UTIL_H_