Import aom library

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

The commit used was 4d668d7feb1f8abd809d1bca0418570a7f142a36.

1 files changed, 86 insertions, 0 deletions

diff --git a/third_party/aom/av1/common/seg_common.h b/third_party/aom/av1/common/seg_common.h
new file mode 100644
index 000000000..03ed38e79
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+++ 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 AV1_COMMON_SEG_COMMON_H_
+#define AV1_COMMON_SEG_COMMON_H_
+
+#include "aom_dsp/prob.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define SEGMENT_DELTADATA 0
+#define SEGMENT_ABSDATA 1
+
+#define MAX_SEGMENTS 8
+#define SEG_TREE_PROBS (MAX_SEGMENTS - 1)
+
+#define PREDICTION_PROBS 3
+
+// Segment level features.
+typedef enum {
+  SEG_LVL_ALT_Q = 0,      // Use alternate Quantizer ....
+  SEG_LVL_ALT_LF = 1,     // Use alternate loop filter value...
+  SEG_LVL_REF_FRAME = 2,  // Optional Segment reference frame
+  SEG_LVL_SKIP = 3,       // Optional Segment (0,0) + skip mode
+  SEG_LVL_MAX = 4         // Number of features supported
+} SEG_LVL_FEATURES;
+
+struct segmentation {
+  uint8_t enabled;
+  uint8_t update_map;
+  uint8_t update_data;
+  uint8_t abs_delta;
+  uint8_t temporal_update;
+
+  int16_t feature_data[MAX_SEGMENTS][SEG_LVL_MAX];
+  unsigned int feature_mask[MAX_SEGMENTS];
+};
+
+struct segmentation_probs {
+  aom_prob tree_probs[SEG_TREE_PROBS];
+#if CONFIG_EC_MULTISYMBOL
+  aom_cdf_prob tree_cdf[CDF_SIZE(MAX_SEGMENTS)];
+#endif
+  aom_prob pred_probs[PREDICTION_PROBS];
+};
+
+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));
+}
+
+void av1_clearall_segfeatures(struct segmentation *seg);
+
+void av1_enable_segfeature(struct segmentation *seg, int segment_id,
+                           SEG_LVL_FEATURES feature_id);
+
+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];
+}
+
+extern const aom_tree_index av1_segment_tree[TREE_SIZE(MAX_SEGMENTS)];
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+
+#endif  // AV1_COMMON_SEG_COMMON_H_