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* Copyright (C) 2007 Vitor Sessak <>
* 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
* 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
#include "libavutil/lfg.h"
* Implementation of the Enhanced LBG Algorithm
* Based on the paper "Neural Networks 14:1219-1237" that can be found in
* .
* @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 numCB 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().
void ff_do_elbg(int *points, int dim, int numpoints, int *codebook,
int numCB, int num_steps, int *closest_cb,
AVLFG *rand_state);
* Initialize the **codebook vector for the elbg algorithm. If you have already
* a codebook and you want to refine it, you shouldn't call this function.
* If numpoints < 8*numCB this function fills **codebook with random numbers.
* If not, it calls ff_do_elbg for a (smaller) random sample of the points in
* **points. Get the same parameters as ff_do_elbg.
void ff_init_elbg(int *points, int dim, int numpoints, int *codebook,
int numCB, int num_steps, int *closest_cb,
AVLFG *rand_state);
#endif /* AVCODEC_ELBG_H */