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1 /*
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2 * linear least squares model
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3 *
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4 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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5 *
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6 * This file is part of FFmpeg.
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7 *
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8 * FFmpeg is free software; you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public
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10 * License as published by the Free Software Foundation; either
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11 * version 2.1 of the License, or (at your option) any later version.
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12 *
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13 * FFmpeg is distributed in the hope that it will be useful,
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14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with FFmpeg; if not, write to the Free Software
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20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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21 */
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22
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23 #ifndef AVUTIL_LLS_H
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24 #define AVUTIL_LLS_H
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25
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26 #include "common.h"
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27 #include "mem.h"
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28 #include "version.h"
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29
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30 #define MAX_VARS 32
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31 #define MAX_VARS_ALIGN FFALIGN(MAX_VARS+1,4)
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32
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33 //FIXME avoid direct access to LLSModel from outside
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34
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35 /**
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36 * Linear least squares model.
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37 */
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38 typedef struct LLSModel {
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39 DECLARE_ALIGNED(32, double, covariance[MAX_VARS_ALIGN][MAX_VARS_ALIGN]);
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40 DECLARE_ALIGNED(32, double, coeff[MAX_VARS][MAX_VARS]);
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41 double variance[MAX_VARS];
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42 int indep_count;
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43 /**
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44 * Take the outer-product of var[] with itself, and add to the covariance matrix.
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45 * @param m this context
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46 * @param var training samples, starting with the value to be predicted
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47 * 32-byte aligned, and any padding elements must be initialized
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48 * (i.e not denormal/nan).
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49 */
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50 void (*update_lls)(struct LLSModel *m, const double *var);
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51 /**
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52 * Inner product of var[] and the LPC coefs.
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53 * @param m this context
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54 * @param var training samples, excluding the value to be predicted. unaligned.
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55 * @param order lpc order
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56 */
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57 double (*evaluate_lls)(struct LLSModel *m, const double *var, int order);
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58 } LLSModel;
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59
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60 void avpriv_init_lls(LLSModel *m, int indep_count);
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61 void ff_init_lls_x86(LLSModel *m);
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62 void avpriv_solve_lls(LLSModel *m, double threshold, unsigned short min_order);
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63
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64 #endif /* AVUTIL_LLS_H */
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