lls.h (2247B)
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 "macros.h" 27 #include "mem_internal.h" 28 29 #define MAX_VARS 32 30 #define MAX_VARS_ALIGN FFALIGN(MAX_VARS+1,4) 31 32 //FIXME avoid direct access to LLSModel from outside 33 34 /** 35 * Linear least squares model. 36 */ 37 typedef struct LLSModel { 38 DECLARE_ALIGNED(32, double, covariance[MAX_VARS_ALIGN][MAX_VARS_ALIGN]); 39 DECLARE_ALIGNED(32, double, coeff[MAX_VARS][MAX_VARS]); 40 double variance[MAX_VARS]; 41 int indep_count; 42 /** 43 * Take the outer-product of var[] with itself, and add to the covariance matrix. 44 * @param m this context 45 * @param var training samples, starting with the value to be predicted 46 * 32-byte aligned, and any padding elements must be initialized 47 * (i.e not denormal/nan). 48 */ 49 void (*update_lls)(struct LLSModel *m, const double *var); 50 /** 51 * Inner product of var[] and the LPC coefs. 52 * @param m this context 53 * @param var training samples, excluding the value to be predicted. unaligned. 54 * @param order lpc order 55 */ 56 double (*evaluate_lls)(struct LLSModel *m, const double *var, int order); 57 } LLSModel; 58 59 void avpriv_init_lls(LLSModel *m, int indep_count); 60 void ff_init_lls_riscv(LLSModel *m); 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 */