8abf8673e6
Move the av1_indices_from_tree() function from av1/encoder/treewriter.c to aom_dsp/prob.c so that it can be used by both the encoder and the decoder. Change-Id: Ie43c599f425c3503b1ff93f0c77b5033a05b1bb4
60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
/*
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* Copyright (c) 2016, Alliance for Open Media. All rights reserved
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*/
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#include "av1/encoder/treewriter.h"
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static void tree2tok(struct av1_token *tokens, const aom_tree_index *tree,
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int i, int v, int l) {
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v += v;
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++l;
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do {
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const aom_tree_index j = tree[i++];
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if (j <= 0) {
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tokens[-j].value = v;
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tokens[-j].len = l;
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} else {
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tree2tok(tokens, tree, j, v, l);
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}
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} while (++v & 1);
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}
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void av1_tokens_from_tree(struct av1_token *tokens,
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const aom_tree_index *tree) {
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tree2tok(tokens, tree, 0, 0, 0);
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}
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static unsigned int convert_distribution(unsigned int i, aom_tree tree,
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unsigned int branch_ct[][2],
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const unsigned int num_events[]) {
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unsigned int left, right;
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if (tree[i] <= 0)
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left = num_events[-tree[i]];
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else
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left = convert_distribution(tree[i], tree, branch_ct, num_events);
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if (tree[i + 1] <= 0)
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right = num_events[-tree[i + 1]];
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else
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right = convert_distribution(tree[i + 1], tree, branch_ct, num_events);
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branch_ct[i >> 1][0] = left;
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branch_ct[i >> 1][1] = right;
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return left + right;
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}
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void av1_tree_probs_from_distribution(aom_tree tree,
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unsigned int branch_ct[/* n-1 */][2],
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const unsigned int num_events[/* n */]) {
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convert_distribution(0, tree, branch_ct, num_events);
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}
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