repositories / deb_ffmpeg.git / blame
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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 avpriv_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 avpriv_do_elbg for a (smaller) random sample of the points in | |
| 49 | * **points. Get the same parameters as avpriv_do_elbg. | |
| 50 | */ | |
| 51 | void avpriv_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 */ |