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  1. /*
  2.  * Copyright (C) 2007 Vitor Sessak <vitor1001@gmail.com>
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #ifndef AVCODEC_ELBG_H
  22. #define AVCODEC_ELBG_H
  23.  
  24. #include "libavutil/lfg.h"
  25.  
  26. /**
  27.  * Implementation of the Enhanced LBG Algorithm
  28.  * Based on the paper "Neural Networks 14:1219-1237" that can be found in
  29.  * http://citeseer.ist.psu.edu/patan01enhanced.html .
  30.  *
  31.  * @param points Input points.
  32.  * @param dim Dimension of the points.
  33.  * @param numpoints Num of points in **points.
  34.  * @param codebook Pointer to the output codebook. Must be allocated.
  35.  * @param numCB Number of points in the codebook.
  36.  * @param num_steps The maximum number of steps. One step is already a good compromise between time and quality.
  37.  * @param closest_cb Return the closest codebook to each point. Must be allocated.
  38.  * @param rand_state A random number generator state. Should be already initialized by av_lfg_init().
  39.  */
  40. void ff_do_elbg(int *points, int dim, int numpoints, int *codebook,
  41.                 int numCB, int num_steps, int *closest_cb,
  42.                 AVLFG *rand_state);
  43.  
  44. /**
  45.  * Initialize the **codebook vector for the elbg algorithm. If you have already
  46.  * a codebook and you want to refine it, you shouldn't call this function.
  47.  * If numpoints < 8*numCB this function fills **codebook with random numbers.
  48.  * If not, it calls ff_do_elbg for a (smaller) random sample of the points in
  49.  * **points. Get the same parameters as ff_do_elbg.
  50.  */
  51. void ff_init_elbg(int *points, int dim, int numpoints, int *codebook,
  52.                   int numCB, int num_steps, int *closest_cb,
  53.                   AVLFG *rand_state);
  54.  
  55. #endif /* AVCODEC_ELBG_H */
  56.