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-rw-r--r--third_party/aom/av1/encoder/variance_tree.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/third_party/aom/av1/encoder/variance_tree.c b/third_party/aom/av1/encoder/variance_tree.c
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+++ b/third_party/aom/av1/encoder/variance_tree.c
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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.
+ */
+
+#include "av1/encoder/variance_tree.h"
+#include "av1/encoder/encoder.h"
+
+void av1_setup_var_tree(struct AV1Common *cm, ThreadData *td) {
+ int i, j;
+#if CONFIG_EXT_PARTITION
+ const int leaf_nodes = 1024;
+ const int tree_nodes = 1024 + 256 + 64 + 16 + 4 + 1;
+#else
+ const int leaf_nodes = 256;
+ const int tree_nodes = 256 + 64 + 16 + 4 + 1;
+#endif // CONFIG_EXT_PARTITION
+ int index = 0;
+ VAR_TREE *this_var;
+ int nodes;
+
+ aom_free(td->var_tree);
+ CHECK_MEM_ERROR(cm, td->var_tree,
+ aom_calloc(tree_nodes, sizeof(*td->var_tree)));
+
+ this_var = &td->var_tree[0];
+
+ // Sets up all the leaf nodes in the tree.
+ for (index = 0; index < leaf_nodes; ++index) {
+ VAR_TREE *const leaf = &td->var_tree[index];
+ leaf->split[0] = NULL;
+ }
+
+ // Each node has 4 leaf nodes, fill in the child pointers
+ // from leafs to the root.
+ for (nodes = leaf_nodes >> 2; nodes > 0; nodes >>= 2) {
+ for (i = 0; i < nodes; ++i, ++index) {
+ VAR_TREE *const node = &td->var_tree[index];
+ for (j = 0; j < 4; j++) node->split[j] = this_var++;
+ }
+ }
+
+ // Set up the root node for the largest superblock size
+ i = MAX_MIB_SIZE_LOG2 - MIN_MIB_SIZE_LOG2;
+ td->var_root[i] = &td->var_tree[tree_nodes - 1];
+ // Set up the root nodes for the rest of the possible superblock sizes
+ while (--i >= 0) {
+ td->var_root[i] = td->var_root[i + 1]->split[0];
+ }
+}
+
+void av1_free_var_tree(ThreadData *td) {
+ aom_free(td->var_tree);
+ td->var_tree = NULL;
+}