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2ba45a60 DM |
1 | /* |
2 | * linear least squares model | |
3 | * | |
4 | * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> | |
5 | * | |
6 | * This file is part of FFmpeg. | |
7 | * | |
8 | * FFmpeg is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; either | |
11 | * version 2.1 of the License, or (at your option) any later version. | |
12 | * | |
13 | * FFmpeg is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with FFmpeg; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | */ | |
22 | ||
23 | #ifndef AVUTIL_LLS_H | |
24 | #define AVUTIL_LLS_H | |
25 | ||
26 | #include "common.h" | |
27 | #include "mem.h" | |
28 | #include "version.h" | |
29 | ||
30 | #define MAX_VARS 32 | |
31 | #define MAX_VARS_ALIGN FFALIGN(MAX_VARS+1,4) | |
32 | ||
33 | //FIXME avoid direct access to LLSModel from outside | |
34 | ||
35 | /** | |
36 | * Linear least squares model. | |
37 | */ | |
38 | typedef struct LLSModel { | |
39 | DECLARE_ALIGNED(32, double, covariance[MAX_VARS_ALIGN][MAX_VARS_ALIGN]); | |
40 | DECLARE_ALIGNED(32, double, coeff[MAX_VARS][MAX_VARS]); | |
41 | double variance[MAX_VARS]; | |
42 | int indep_count; | |
43 | /** | |
44 | * Take the outer-product of var[] with itself, and add to the covariance matrix. | |
45 | * @param m this context | |
46 | * @param var training samples, starting with the value to be predicted | |
47 | * 32-byte aligned, and any padding elements must be initialized | |
48 | * (i.e not denormal/nan). | |
49 | */ | |
f6fa7814 | 50 | void (*update_lls)(struct LLSModel *m, const double *var); |
2ba45a60 DM |
51 | /** |
52 | * Inner product of var[] and the LPC coefs. | |
53 | * @param m this context | |
54 | * @param var training samples, excluding the value to be predicted. unaligned. | |
55 | * @param order lpc order | |
56 | */ | |
f6fa7814 | 57 | double (*evaluate_lls)(struct LLSModel *m, const double *var, int order); |
2ba45a60 DM |
58 | } LLSModel; |
59 | ||
60 | void avpriv_init_lls(LLSModel *m, int indep_count); | |
61 | void ff_init_lls_x86(LLSModel *m); | |
62 | void avpriv_solve_lls(LLSModel *m, double threshold, unsigned short min_order); | |
63 | ||
64 | #endif /* AVUTIL_LLS_H */ |