Import aom library

This is the reference implementation for the Alliance for Open Media's av1 video code.

The commit used was 4d668d7feb1f8abd809d1bca0418570a7f142a36.

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diff --git a/third_party/aom/av1/encoder/palette.h b/third_party/aom/av1/encoder/palette.h
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+/*
+ * Copyright (c) 2016, 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 AV1_ENCODER_PALETTE_H_
+#define AV1_ENCODER_PALETTE_H_
+
+#include "av1/common/blockd.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Given 'n' 'data' points and 'k' 'centroids' each of dimension 'dim',
+// calculate the centroid 'indices' for the data points.
+void av1_calc_indices(const float *data, const float *centroids,
+                      uint8_t *indices, int n, int k, int dim);
+
+// Given 'n' 'data' points and an initial guess of 'k' 'centroids' each of
+// dimension 'dim', runs up to 'max_itr' iterations of k-means algorithm to get
+// updated 'centroids' and the centroid 'indices' for elements in 'data'.
+// Note: the output centroids are rounded off to nearest integers.
+void av1_k_means(const float *data, float *centroids, uint8_t *indices, int n,
+                 int k, int dim, int max_itr);
+
+// Given a list of centroids, returns the unique number of centroids 'k', and
+// puts these unique centroids in first 'k' indices of 'centroids' array.
+// Ideally, the centroids should be rounded to integers before calling this
+// method.
+int av1_remove_duplicates(float *centroids, int num_centroids);
+
+// Returns the number of colors in 'src'.
+int av1_count_colors(const uint8_t *src, int stride, int rows, int cols);
+#if CONFIG_HIGHBITDEPTH
+// Same as av1_count_colors(), but for high-bitdepth mode.
+int av1_count_colors_highbd(const uint8_t *src8, int stride, int rows, int cols,
+                            int bit_depth);
+#endif  // CONFIG_HIGHBITDEPTH
+
+#if CONFIG_PALETTE_DELTA_ENCODING
+// Return the number of bits used to transmit each luma palette color delta.
+int av1_get_palette_delta_bits_y(const PALETTE_MODE_INFO *const pmi,
+                                 int bit_depth, int *min_bits);
+
+// Return the number of bits used to transmit each U palette color delta.
+int av1_get_palette_delta_bits_u(const PALETTE_MODE_INFO *const pmi,
+                                 int bit_depth, int *min_bits);
+
+// Return the number of bits used to transmit each v palette color delta;
+// assign zero_count with the number of deltas being 0.
+int av1_get_palette_delta_bits_v(const PALETTE_MODE_INFO *const pmi,
+                                 int bit_depth, int *zero_count, int *min_bits);
+#endif  // CONFIG_PALETTE_DELTA_ENCODING
+
+// Return the rate cost for transmitting luma palette color values.
+int av1_palette_color_cost_y(const PALETTE_MODE_INFO *const pmi, int bit_depth);
+
+// Return the rate cost for transmitting chroma palette color values.
+int av1_palette_color_cost_uv(const PALETTE_MODE_INFO *const pmi,
+                              int bit_depth);
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif /* AV1_ENCODER_PALETTE_H_ */