/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* ====================================================================
 * Copyright (c) 2005 Carnegie Mellon University.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * This work was supported in part by funding from the Defense Advanced 
 * Research Projects Agency and the National Science Foundation of the 
 * United States of America, and the CMU Sphinx Speech Consortium.
 *
 * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND 
 * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
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 * ====================================================================
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 */
/*********************************************************************
 *
 * File: kdtree.h
 * 
 * Description: Cut-down kd-trees for Sphinx2 decoding
 * 
 * Author: David Huggins-Daines <dhuggins@cs.cmu.edu>
 * 
 *********************************************************************/

#ifndef __KDTREE_H__
#define __KDTREE_H__

#include "s3types.h"
#include "vector.h"


#ifdef __cplusplus
extern "C" {
#endif
#if 0
/* Fool Emacs. */
}
#endif

typedef struct kd_tree_node_s kd_tree_node_t;
struct kd_tree_node_s {
    uint8 *bbi; /* BBI list of intersecting Gaussians */
    /* FIXME: Should be mfcc_t */
    float32 split_plane;
    uint16 n_bbi, split_comp;
    uint16 left, right; /* Indices of left and right child nodes */
};
typedef struct kd_tree_s kd_tree_t;
struct kd_tree_s {
    uint32 n_nodes, n_level, n_comp;
    kd_tree_node_t *nodes;
};

int32 read_kd_trees(const char *infile, kd_tree_t ***out_trees, uint32 *out_n_trees,
		    uint32 maxdepth, int32 maxbbi);
void free_kd_tree(kd_tree_t *tree);
/* FIXME: Should be mfcc_t */
kd_tree_node_t *eval_kd_tree(kd_tree_t *tree, float32 *feat, uint32 maxdepth);

#ifdef __cplusplus
}
#endif


#endif /* __KDTREE_H__ */
