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diff --git a/third_party/aom/av1/common/seg_common.h b/third_party/aom/av1/common/seg_common.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 AOM_AV1_COMMON_SEG_COMMON_H_
+#define AOM_AV1_COMMON_SEG_COMMON_H_
+
+#include "aom_dsp/prob.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define MAX_SEGMENTS 8
+#define SEG_TREE_PROBS (MAX_SEGMENTS - 1)
+
+#define SEG_TEMPORAL_PRED_CTXS 3
+#define SPATIAL_PREDICTION_PROBS 3
+
+typedef enum {
+ SEG_LVL_ALT_Q, // Use alternate Quantizer ....
+ SEG_LVL_ALT_LF_Y_V, // Use alternate loop filter value on y plane vertical
+ SEG_LVL_ALT_LF_Y_H, // Use alternate loop filter value on y plane horizontal
+ SEG_LVL_ALT_LF_U, // Use alternate loop filter value on u plane
+ SEG_LVL_ALT_LF_V, // Use alternate loop filter value on v plane
+ SEG_LVL_REF_FRAME, // Optional Segment reference frame
+ SEG_LVL_SKIP, // Optional Segment (0,0) + skip mode
+ SEG_LVL_GLOBALMV,
+ SEG_LVL_MAX
+} SEG_LVL_FEATURES;
+
+struct segmentation {
+ uint8_t enabled;
+ uint8_t update_map;
+ uint8_t update_data;
+ uint8_t temporal_update;
+
+ int16_t feature_data[MAX_SEGMENTS][SEG_LVL_MAX];
+ unsigned int feature_mask[MAX_SEGMENTS];
+ int last_active_segid; // The highest numbered segment id that has some
+ // enabled feature.
+ uint8_t segid_preskip; // Whether the segment id will be read before the
+ // skip syntax element.
+ // 1: the segment id will be read first.
+ // 0: the skip syntax element will be read first.
+};
+
+struct segmentation_probs {
+ aom_cdf_prob tree_cdf[CDF_SIZE(MAX_SEGMENTS)];
+ aom_cdf_prob pred_cdf[SEG_TEMPORAL_PRED_CTXS][CDF_SIZE(2)];
+ aom_cdf_prob spatial_pred_seg_cdf[SPATIAL_PREDICTION_PROBS]
+ [CDF_SIZE(MAX_SEGMENTS)];
+};
+
+static INLINE int segfeature_active(const struct segmentation *seg,
+ int segment_id,
+ SEG_LVL_FEATURES feature_id) {
+ return seg->enabled && (seg->feature_mask[segment_id] & (1 << feature_id));
+}
+
+static INLINE void segfeatures_copy(struct segmentation *dst,
+ const struct segmentation *src) {
+ int i, j;
+ for (i = 0; i < MAX_SEGMENTS; i++) {
+ dst->feature_mask[i] = src->feature_mask[i];
+ for (j = 0; j < SEG_LVL_MAX; j++) {
+ dst->feature_data[i][j] = src->feature_data[i][j];
+ }
+ }
+ dst->segid_preskip = src->segid_preskip;
+ dst->last_active_segid = src->last_active_segid;
+}
+
+void av1_clearall_segfeatures(struct segmentation *seg);
+
+void av1_enable_segfeature(struct segmentation *seg, int segment_id,
+ SEG_LVL_FEATURES feature_id);
+
+void calculate_segdata(struct segmentation *seg);
+
+int av1_seg_feature_data_max(SEG_LVL_FEATURES feature_id);
+
+int av1_is_segfeature_signed(SEG_LVL_FEATURES feature_id);
+
+void av1_set_segdata(struct segmentation *seg, int segment_id,
+ SEG_LVL_FEATURES feature_id, int seg_data);
+
+static INLINE int get_segdata(const struct segmentation *seg, int segment_id,
+ SEG_LVL_FEATURES feature_id) {
+ return seg->feature_data[segment_id][feature_id];
+}
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // AOM_AV1_COMMON_SEG_COMMON_H_