lls.h 2.44 KB
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/*
 * linear least squares model
 *
 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * 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
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */

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#ifndef AVUTIL_LLS_H
#define AVUTIL_LLS_H
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#include "common.h"
#include "mem.h"
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#include "version.h"

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#define MAX_VARS 32
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#define MAX_VARS_ALIGN FFALIGN(MAX_VARS+1,4)
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//FIXME avoid direct access to LLSModel from outside

/**
 * Linear least squares model.
 */
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typedef struct LLSModel {
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    DECLARE_ALIGNED(32, double, covariance[MAX_VARS_ALIGN][MAX_VARS_ALIGN]);
    DECLARE_ALIGNED(32, double, coeff[MAX_VARS][MAX_VARS]);
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    double variance[MAX_VARS];
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    int indep_count;
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    /**
     * 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
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     *            32-byte aligned, and any padding elements must be initialized
     *            (i.e not denormal/nan).
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     */
    void (*update_lls)(struct LLSModel *m, double *var);
    /**
     * Inner product of var[] and the LPC coefs.
     * @param m this context
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     * @param var training samples, excluding the value to be predicted. unaligned.
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     * @param order lpc order
     */
    double (*evaluate_lls)(struct LLSModel *m, double *var, int order);
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} LLSModel;
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void avpriv_init_lls(LLSModel *m, int indep_count);
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void ff_init_lls_x86(LLSModel *m);
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void avpriv_solve_lls(LLSModel *m, double threshold, unsigned short min_order);
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#if FF_API_LLS_PRIVATE
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void av_init_lls(LLSModel *m, int indep_count);
void av_update_lls(LLSModel *m, double *param, double decay);
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void av_solve_lls(LLSModel *m, double threshold, int min_order);
double av_evaluate_lls(LLSModel *m, double *param, int order);
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#endif /* FF_API_LLS_PRIVATE */

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#endif /* AVUTIL_LLS_H */