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66 lines
1.8 KiB
66 lines
1.8 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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#if USE_FIXED |
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#define CBRT_RENAME(a) a ## _fixed |
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#define CBRT(x) (int)floor((x).f * 8192 + 0.5) |
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#else |
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#define CBRT_RENAME(a) a |
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#define CBRT(x) x.i |
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#endif |
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#if CONFIG_HARDCODED_TABLES |
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#if USE_FIXED |
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#define cbrt_tableinit_fixed() |
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#include "libavcodec/cbrt_fixed_tables.h" |
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#else |
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#define cbrt_tableinit() |
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#include "libavcodec/cbrt_tables.h" |
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#endif |
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#else |
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static uint32_t cbrt_tab[1 << 13]; |
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static av_cold void CBRT_RENAME(cbrt_tableinit)(void) |
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{ |
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if (!cbrt_tab[(1<<13) - 1]) { |
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int i; |
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/* cbrtf() isn't available on all systems, so we use powf(). */ |
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for (i = 0; i < 1<<13; i++) { |
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union { |
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float f; |
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uint32_t i; |
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} f; |
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f.f = pow(i, 1.0 / 3.0) * i; |
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cbrt_tab[i] = CBRT(f); |
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} |
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} |
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} |
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#endif /* CONFIG_HARDCODED_TABLES */ |
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#endif /* AVCODEC_CBRT_TABLEGEN_H */
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