mirror of
https://git.ffmpeg.org/ffmpeg.git
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56 lines
1.8 KiB
C
56 lines
1.8 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* 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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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; 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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#include <limits.h>
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#include <stdio.h>
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#include "libavutil/internal.h"
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#include "libavutil/lfg.h"
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#include "libavutil/lls.h"
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#include "libavutil/mem_internal.h"
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int main(void)
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{
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LLSModel m;
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int i, order;
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AVLFG lfg;
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av_lfg_init(&lfg, 1);
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avpriv_init_lls(&m, 3);
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for (i = 0; i < 100; i++) {
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LOCAL_ALIGNED(32, double, var, [4]);
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double eval;
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var[0] = (av_lfg_get(&lfg) / (double) UINT_MAX - 0.5) * 2;
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var[1] = var[0] + av_lfg_get(&lfg) / (double) UINT_MAX - 0.5;
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var[2] = var[1] + av_lfg_get(&lfg) / (double) UINT_MAX - 0.5;
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var[3] = var[2] + av_lfg_get(&lfg) / (double) UINT_MAX - 0.5;
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m.update_lls(&m, var);
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avpriv_solve_lls(&m, 0.001, 0);
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for (order = 0; order < 3; order++) {
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eval = m.evaluate_lls(&m, var + 1, order);
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printf("real:%9f order:%d pred:%9f var:%f coeffs:%f %9f %9f\n",
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var[0], order, eval, sqrt(m.variance[order] / (i + 1)),
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m.coeff[order][0], m.coeff[order][1],
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m.coeff[order][2]);
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}
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}
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return 0;
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}
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