yading@10: /*
yading@10:  * Copyright (C) 2007 Vitor Sessak <vitor1001@gmail.com>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #ifndef AVCODEC_ELBG_H
yading@10: #define AVCODEC_ELBG_H
yading@10: 
yading@10: #include "libavutil/lfg.h"
yading@10: 
yading@10: /**
yading@10:  * Implementation of the Enhanced LBG Algorithm
yading@10:  * Based on the paper "Neural Networks 14:1219-1237" that can be found in
yading@10:  * http://citeseer.ist.psu.edu/patan01enhanced.html .
yading@10:  *
yading@10:  * @param points Input points.
yading@10:  * @param dim Dimension of the points.
yading@10:  * @param numpoints Num of points in **points.
yading@10:  * @param codebook Pointer to the output codebook. Must be allocated.
yading@10:  * @param numCB Number of points in the codebook.
yading@10:  * @param num_steps The maximum number of steps. One step is already a good compromise between time and quality.
yading@10:  * @param closest_cb Return the closest codebook to each point. Must be allocated.
yading@10:  * @param rand_state A random number generator state. Should be already initialized by av_lfg_init().
yading@10:  */
yading@10: void ff_do_elbg(int *points, int dim, int numpoints, int *codebook,
yading@10:                 int numCB, int num_steps, int *closest_cb,
yading@10:                 AVLFG *rand_state);
yading@10: 
yading@10: /**
yading@10:  * Initialize the **codebook vector for the elbg algorithm. If you have already
yading@10:  * a codebook and you want to refine it, you shouldn't call this function.
yading@10:  * If numpoints < 8*numCB this function fills **codebook with random numbers.
yading@10:  * If not, it calls ff_do_elbg for a (smaller) random sample of the points in
yading@10:  * **points. Get the same parameters as ff_do_elbg.
yading@10:  */
yading@10: void ff_init_elbg(int *points, int dim, int numpoints, int *codebook,
yading@10:                   int numCB, int num_steps, int *closest_cb,
yading@10:                   AVLFG *rand_state);
yading@10: 
yading@10: #endif /* AVCODEC_ELBG_H */