PeerStreamer

/*

 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * FFmpeg is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

/**

 * @file tree.h

 * A tree container.

 * @author Michael Niedermayer <michaelni@gmx.at>

 */

#ifndef FFMPEG_TREE_H

#define FFMPEG_TREE_H

struct AVTreeNode;

/**

 * Finds an element.

 * @param root a pointer to the root node of the tree

 * @param next If next is not NULL then next[0] will contain the previous

 *             element and next[1] the next element if either does not exist

 *             then the corresponding entry in next is unchanged.

 * @return An element with cmp(key, elem)==0 or NULL if no such element exists in

 *         the tree.

 */

void *av_tree_find(const struct AVTreeNode *root, void *key, int (*cmp)(void *key, const void *b), void *next[2]);

/**

 * Finds a element for which cmp(key, elem)==0, if no such element is found key

 * is inserted into the tree.

 * @param rootp A pointer to a pointer to the root node of the tree. Note that

 *              the root node can change during insertions, this is required

 *              to keep the tree balanced.

 *

 * @return If no insertion happened, the found element.

 *         If an insertion happened, then either key or NULL will be returned.

 *         Which one it is depends on the tree state and the implementation. You

 *         should make no assumptions that it's one or the other in the code.

 */

void *av_tree_insert(struct AVTreeNode **rootp, void *key, int (*cmp)(void *key, const void *b));

void av_tree_destroy(struct AVTreeNode *t);

#endif /* FFMPEG_TREE_H */