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/*
* Copyright (C) 2007 Vitor Sessak <vitor1001@gmail.com>
*
* 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
*/
#ifndef AVCODEC_ELBG_H
#define AVCODEC_ELBG_H
#include "libavutil/lfg.h"
struct ELBGContext;
/**
* Implementation of the Enhanced LBG Algorithm
* Based on the paper "Neural Networks 14:1219-1237" that can be found in
* http://citeseer.ist.psu.edu/patan01enhanced.html .
*
* @param ctx A pointer to a pointer to an already allocated ELBGContext
* or a pointer to NULL. In the latter case, this function
* will allocate an ELBGContext and put a pointer to it in `*ctx`.
* @param points Input points.
* @param dim Dimension of the points.
* @param numpoints Num of points in **points.
* @param codebook Pointer to the output codebook. Must be allocated.
* @param num_cb Number of points in the codebook.
* @param num_steps The maximum number of steps. One step is already a good compromise between time and quality.
* @param closest_cb Return the closest codebook to each point. Must be allocated.
* @param rand_state A random number generator state. Should be already initialized by av_lfg_init().
* @return < 0 in case of error, 0 otherwise
*/
int avpriv_elbg_do(struct ELBGContext **ctx, int *points, int dim,
int numpoints, int *codebook, int num_cb, int num_steps,
int *closest_cb, AVLFG *rand_state);
/**
* Free an ELBGContext and reset the pointer to it.
*/
void avpriv_elbg_free(struct ELBGContext **ctx);
#endif /* AVCODEC_ELBG_H */
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