70ad668056
change prefix vp9_ to vpx_ for non codec specific functions and data structures. Change-Id: I97c7e6422eceea99212b93f4942bc2187763a07c
59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
/*
|
|
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license
|
|
* that can be found in the LICENSE file in the root of the source
|
|
* tree. An additional intellectual property rights grant can be found
|
|
* in the file PATENTS. All contributing project authors may
|
|
* be found in the AUTHORS file in the root of the source tree.
|
|
*/
|
|
|
|
#include "vp9/encoder/vp9_treewriter.h"
|
|
|
|
static void tree2tok(struct vp9_token *tokens, const vpx_tree_index *tree,
|
|
int i, int v, int l) {
|
|
v += v;
|
|
++l;
|
|
|
|
do {
|
|
const vpx_tree_index j = tree[i++];
|
|
if (j <= 0) {
|
|
tokens[-j].value = v;
|
|
tokens[-j].len = l;
|
|
} else {
|
|
tree2tok(tokens, tree, j, v, l);
|
|
}
|
|
} while (++v & 1);
|
|
}
|
|
|
|
void vp9_tokens_from_tree(struct vp9_token *tokens,
|
|
const vpx_tree_index *tree) {
|
|
tree2tok(tokens, tree, 0, 0, 0);
|
|
}
|
|
|
|
static unsigned int convert_distribution(unsigned int i, vpx_tree tree,
|
|
unsigned int branch_ct[][2],
|
|
const unsigned int num_events[]) {
|
|
unsigned int left, right;
|
|
|
|
if (tree[i] <= 0)
|
|
left = num_events[-tree[i]];
|
|
else
|
|
left = convert_distribution(tree[i], tree, branch_ct, num_events);
|
|
|
|
if (tree[i + 1] <= 0)
|
|
right = num_events[-tree[i + 1]];
|
|
else
|
|
right = convert_distribution(tree[i + 1], tree, branch_ct, num_events);
|
|
|
|
branch_ct[i >> 1][0] = left;
|
|
branch_ct[i >> 1][1] = right;
|
|
return left + right;
|
|
}
|
|
|
|
void vp9_tree_probs_from_distribution(vpx_tree tree,
|
|
unsigned int branch_ct[/* n-1 */][2],
|
|
const unsigned int num_events[/* n */]) {
|
|
convert_distribution(0, tree, branch_ct, num_events);
|
|
}
|