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74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
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/*
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* Header file for hardcoded AAC cube-root table
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*
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* Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
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*
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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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#ifndef AVCODEC_CBRT_TABLEGEN_H
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#define AVCODEC_CBRT_TABLEGEN_H
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#include <stdint.h>
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#include <math.h>
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#include "libavutil/attributes.h"
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#include "libavutil/intfloat.h"
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#include "libavcodec/aac_defines.h"
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#if USE_FIXED
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#define CBRT(x) lrint((x) * 8192)
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#else
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#define CBRT(x) av_float2int((float)(x))
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#endif
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uint32_t AAC_RENAME(ff_cbrt_tab)[1 << 13];
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av_cold void AAC_RENAME(ff_cbrt_tableinit)(void)
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{
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static double cbrt_tab_dbl[1 << 13];
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if (!AAC_RENAME(ff_cbrt_tab)[(1<<13) - 1]) {
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int i, j, k;
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double cbrt_val;
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for (i = 1; i < 1<<13; i++)
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cbrt_tab_dbl[i] = 1;
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/* have to take care of non-squarefree numbers */
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for (i = 2; i < 90; i++) {
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if (cbrt_tab_dbl[i] == 1) {
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cbrt_val = i * cbrt(i);
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for (k = i; k < 1<<13; k *= i)
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for (j = k; j < 1<<13; j += k)
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cbrt_tab_dbl[j] *= cbrt_val;
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}
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}
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for (i = 91; i <= 8191; i+= 2) {
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if (cbrt_tab_dbl[i] == 1) {
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cbrt_val = i * cbrt(i);
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for (j = i; j < 1<<13; j += i)
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cbrt_tab_dbl[j] *= cbrt_val;
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}
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}
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for (i = 0; i < 1<<13; i++)
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AAC_RENAME(ff_cbrt_tab)[i] = CBRT(cbrt_tab_dbl[i]);
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}
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}
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#endif /* AVCODEC_CBRT_TABLEGEN_H */
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