libavcodec/elbg.h

   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/random.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 initialised by av_init_random.
  39  */
  40 void ff_do_elbg(int *points, int dim, int numpoints, int *codebook,
  41                 int numCB, int num_steps, int *closest_cb,
  42                 AVRandomState *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                   AVRandomState *rand_state);
  54
  55 #endif /* AVCODEC_ELBG_H */