| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Header file for hardcoded mpegaudiodec tables | ||
| 3 | * | ||
| 4 | * Copyright (c) 2009 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_MPEGAUDIO_TABLEGEN_H | ||
| 24 | #define AVCODEC_MPEGAUDIO_TABLEGEN_H | ||
| 25 | |||
| 26 | #include <stdint.h> | ||
| 27 | #include <math.h> | ||
| 28 | #include "libavutil/attributes.h" | ||
| 29 | |||
| 30 | #if CONFIG_HARDCODED_TABLES | ||
| 31 | #define mpegaudio_tableinit() | ||
| 32 | #include "libavcodec/mpegaudio_tables.h" | ||
| 33 | #else | ||
| 34 | #if defined(BUILD_TABLES) || !USE_FLOATS | ||
| 35 | #define FIXED_TABLE | ||
| 36 | static uint32_t exp_table_fixed[512]; | ||
| 37 | static uint32_t expval_table_fixed[512][16]; | ||
| 38 | #endif | ||
| 39 | |||
| 40 | #if defined(BUILD_TABLES) || USE_FLOATS | ||
| 41 | #define FLOAT_TABLE | ||
| 42 | static float exp_table_float[512]; | ||
| 43 | static float expval_table_float[512][16]; | ||
| 44 | #endif | ||
| 45 | |||
| 46 | #define IMDCT_SCALAR 1.759 | ||
| 47 | |||
| 48 | 108 | static av_cold void mpegaudio_tableinit(void) | |
| 49 | { | ||
| 50 | int i, value, exponent; | ||
| 51 | static const double exp2_lut[4] = { | ||
| 52 | 1.00000000000000000000, /* 2 ^ (0 * 0.25) */ | ||
| 53 | 1.18920711500272106672, /* 2 ^ (1 * 0.25) */ | ||
| 54 | M_SQRT2 , /* 2 ^ (2 * 0.25) */ | ||
| 55 | 1.68179283050742908606, /* 2 ^ (3 * 0.25) */ | ||
| 56 | }; | ||
| 57 | double pow43_lut[16]; | ||
| 58 | 108 | double exp2_base = 2.11758236813575084767080625169910490512847900390625e-22; // 2^(-72) | |
| 59 | double exp2_val; | ||
| 60 | |||
| 61 |
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1836 | for (i = 0; i < 16; ++i) |
| 62 | 1728 | pow43_lut[i] = i * cbrt(i); | |
| 63 | |||
| 64 |
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55404 | for (exponent = 0; exponent < 512; exponent++) { |
| 65 |
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55296 | if (exponent && (exponent & 3) == 0) |
| 66 | 13716 | exp2_base *= 2; | |
| 67 | 55296 | exp2_val = exp2_base * exp2_lut[exponent & 3] / IMDCT_SCALAR; | |
| 68 |
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940032 | for (value = 0; value < 16; value++) { |
| 69 | 884736 | double f = pow43_lut[value] * exp2_val; | |
| 70 | #ifdef FIXED_TABLE | ||
| 71 |
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385024 | expval_table_fixed[exponent][value] = (f < 0xFFFFFFFF ? llrint(f) : 0xFFFFFFFF); |
| 72 | #endif | ||
| 73 | #ifdef FLOAT_TABLE | ||
| 74 | 499712 | expval_table_float[exponent][value] = f; | |
| 75 | #endif | ||
| 76 | } | ||
| 77 | #ifdef FIXED_TABLE | ||
| 78 | 24064 | exp_table_fixed[exponent] = expval_table_fixed[exponent][1]; | |
| 79 | #endif | ||
| 80 | #ifdef FLOAT_TABLE | ||
| 81 | 31232 | exp_table_float[exponent] = expval_table_float[exponent][1]; | |
| 82 | #endif | ||
| 83 | } | ||
| 84 | 108 | } | |
| 85 | #undef FLOAT_TABLE | ||
| 86 | #undef FIXED_TABLE | ||
| 87 | #endif /* CONFIG_HARDCODED_TABLES */ | ||
| 88 | |||
| 89 | #endif /* AVCODEC_MPEGAUDIO_TABLEGEN_H */ | ||
| 90 |