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| Rev | Author | Line No. | Line |
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| 4349 | Serge | 1 | /* |
| 2 | * Header file for hardcoded AAC cube-root table |
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| 3 | * |
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| 4 | * Copyright (c) 2010 Reimar Döffinger |
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| 5 | * |
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| 6 | * This file is part of FFmpeg. |
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| 7 | * |
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| 8 | * FFmpeg is free software; you can redistribute it and/or |
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| 9 | * modify it under the terms of the GNU Lesser General Public |
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| 10 | * License as published by the Free Software Foundation; either |
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| 11 | * version 2.1 of the License, or (at your option) any later version. |
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| 12 | * |
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| 13 | * FFmpeg is distributed in the hope that it will be useful, |
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 16 | * Lesser General Public License for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU Lesser General Public |
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| 19 | * License along with FFmpeg; if not, write to the Free Software |
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| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 21 | */ |
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| 22 | |||
| 23 | #ifndef AVCODEC_CBRT_TABLEGEN_H |
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| 24 | #define AVCODEC_CBRT_TABLEGEN_H |
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| 25 | |||
| 26 | #include |
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| 27 | #include |
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| 28 | |||
| 29 | #if CONFIG_HARDCODED_TABLES |
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| 30 | #define cbrt_tableinit() |
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| 31 | #include "libavcodec/cbrt_tables.h" |
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| 32 | #else |
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| 33 | static uint32_t cbrt_tab[1 << 13]; |
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| 34 | |||
| 35 | static void cbrt_tableinit(void) |
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| 36 | { |
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| 37 | if (!cbrt_tab[(1<<13) - 1]) { |
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| 38 | int i; |
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| 39 | /* cbrtf() isn't available on all systems, so we use powf(). */ |
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| 40 | for (i = 0; i < 1<<13; i++) { |
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| 41 | union { |
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| 42 | float f; |
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| 43 | uint32_t i; |
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| 44 | } f; |
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| 45 | f.f = pow(i, 1.0 / 3.0) * i; |
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| 46 | cbrt_tab[i] = f.i; |
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| 47 | } |
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| 48 | } |
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| 49 | } |
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| 50 | #endif /* CONFIG_HARDCODED_TABLES */ |
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| 51 | |||
| 52 | #endif /* AVCODEC_CBRT_TABLEGEN_H */ |