1 /*

2 * Copyright (C) 2007 Vitor Sessak <vitor1001@gmail.com>

3 *

4 * This file is part of Libav.

5 *

6 * Libav 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 * Libav 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 Libav; if not, write to the Free Software

18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

19 */

21 #ifndef AVCODEC_ELBG_H

22 #define AVCODEC_ELBG_H

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 * @return < 0 in case of error, 0 otherwise

40 */

45 /**

46 * Initialize the **codebook vector for the elbg algorithm. If you have already

47 * a codebook and you want to refine it, you shouldn't call this function.

48 * If numpoints < 8*numCB this function fills **codebook with random numbers.

49 * If not, it calls ff_do_elbg for a (smaller) random sample of the points in

50 * **points. Get the same parameters as ff_do_elbg.

51 * @return < 0 in case of error, 0 otherwise

52 */