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73 lines
2.2 KiB
73 lines
2.2 KiB
/* |
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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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