blob: 9af18d8ab5e15d6a33df932b726f835182e16850
| 1 | /* |
| 2 | * Header file for hardcoded AAC cube-root table |
| 3 | * |
| 4 | * Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de> |
| 5 | * |
| 6 | * This file is part of FFmpeg. |
| 7 | * |
| 8 | * FFmpeg is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU Lesser General Public |
| 10 | * License as published by the Free Software Foundation; either |
| 11 | * version 2.1 of the License, or (at your option) any later version. |
| 12 | * |
| 13 | * FFmpeg is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * Lesser General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU Lesser General Public |
| 19 | * License along with FFmpeg; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | */ |
| 22 | |
| 23 | #ifndef AVCODEC_CBRT_TABLEGEN_H |
| 24 | #define AVCODEC_CBRT_TABLEGEN_H |
| 25 | |
| 26 | #include <stdint.h> |
| 27 | #include <math.h> |
| 28 | #include "libavutil/attributes.h" |
| 29 | #include "libavutil/intfloat.h" |
| 30 | #include "libavcodec/aac_defines.h" |
| 31 | |
| 32 | #if USE_FIXED |
| 33 | #define CBRT(x) lrint((x) * 8192) |
| 34 | #else |
| 35 | #define CBRT(x) av_float2int((float)(x)) |
| 36 | #endif |
| 37 | |
| 38 | uint32_t AAC_RENAME(ff_cbrt_tab)[1 << 13]; |
| 39 | |
| 40 | av_cold void AAC_RENAME(ff_cbrt_tableinit)(void) |
| 41 | { |
| 42 | static double cbrt_tab_dbl[1 << 13]; |
| 43 | if (!AAC_RENAME(ff_cbrt_tab)[(1<<13) - 1]) { |
| 44 | int i, j, k; |
| 45 | double cbrt_val; |
| 46 | |
| 47 | for (i = 1; i < 1<<13; i++) |
| 48 | cbrt_tab_dbl[i] = 1; |
| 49 | |
| 50 | /* have to take care of non-squarefree numbers */ |
| 51 | for (i = 2; i < 90; i++) { |
| 52 | if (cbrt_tab_dbl[i] == 1) { |
| 53 | cbrt_val = i * cbrt(i); |
| 54 | for (k = i; k < 1<<13; k *= i) |
| 55 | for (j = k; j < 1<<13; j += k) |
| 56 | cbrt_tab_dbl[j] *= cbrt_val; |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | for (i = 91; i <= 8191; i+= 2) { |
| 61 | if (cbrt_tab_dbl[i] == 1) { |
| 62 | cbrt_val = i * cbrt(i); |
| 63 | for (j = i; j < 1<<13; j += i) |
| 64 | cbrt_tab_dbl[j] *= cbrt_val; |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | for (i = 0; i < 1<<13; i++) |
| 69 | AAC_RENAME(ff_cbrt_tab)[i] = CBRT(cbrt_tab_dbl[i]); |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | #endif /* AVCODEC_CBRT_TABLEGEN_H */ |
| 74 |