| /* |

| * linear least squares model |

| * |

| * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> |

| * |

| * This file is part of FFmpeg. |

| * |

| * FFmpeg is free software; you can redistribute it and/or |

| * modify it under the terms of the GNU Lesser General Public |

| * License as published by the Free Software Foundation; either |

| * version 2.1 of the License, or (at your option) any later version. |

| * |

| * FFmpeg is distributed in the hope that it will be useful, |

| * but WITHOUT ANY WARRANTY; without even the implied warranty of |

| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |

| * Lesser General Public License for more details. |

| * |

| * You should have received a copy of the GNU Lesser General Public |

| * License along with FFmpeg; if not, write to the Free Software |

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

| */ |

| |

| #ifndef AVUTIL_LLS_H |

| #define AVUTIL_LLS_H |

| |

| #include "macros.h" |

| #include "mem.h" |

| #include "version.h" |

| |

| #define MAX_VARS 32 |

| #define MAX_VARS_ALIGN FFALIGN(MAX_VARS+1,4) |

| |

| //FIXME avoid direct access to LLSModel from outside |

| |

| /** |

| * Linear least squares model. |

| */ |

| typedef struct LLSModel { |

| DECLARE_ALIGNED(32, double, covariance[MAX_VARS_ALIGN][MAX_VARS_ALIGN]); |

| DECLARE_ALIGNED(32, double, coeff[MAX_VARS][MAX_VARS]); |

| double variance[MAX_VARS]; |

| int indep_count; |

| /** |

| * Take the outer-product of var[] with itself, and add to the covariance matrix. |

| * @param m this context |

| * @param var training samples, starting with the value to be predicted |

| * 32-byte aligned, and any padding elements must be initialized |

| * (i.e not denormal/nan). |

| */ |

| void (*update_lls)(struct LLSModel *m, const double *var); |

| /** |

| * Inner product of var[] and the LPC coefs. |

| * @param m this context |

| * @param var training samples, excluding the value to be predicted. unaligned. |

| * @param order lpc order |

| */ |

| double (*evaluate_lls)(struct LLSModel *m, const double *var, int order); |

| } LLSModel; |

| |

| void avpriv_init_lls(LLSModel *m, int indep_count); |

| void ff_init_lls_x86(LLSModel *m); |

| void avpriv_solve_lls(LLSModel *m, double threshold, unsigned short min_order); |

| |

| #endif /* AVUTIL_LLS_H */ |