FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/mpegaudio_tablegen.h
Date: 2021-09-24 20:55:06
Exec Total Coverage
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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 99 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 99 double exp2_base = 2.11758236813575084767080625169910490512847900390625e-22; // 2^(-72)
59 double exp2_val;
60
61
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1683 for (i = 0; i < 16; ++i)
62 1584 pow43_lut[i] = i * cbrt(i);
63
64
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50787 for (exponent = 0; exponent < 512; exponent++) {
65
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50688 if (exponent && (exponent & 3) == 0)
66 12573 exp2_base *= 2;
67 50688 exp2_val = exp2_base * exp2_lut[exponent & 3] / IMDCT_SCALAR;
68
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861696 for (value = 0; value < 16; value++) {
69 811008 double f = pow43_lut[value] * exp2_val;
70 #ifdef FIXED_TABLE
71
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368640 expval_table_fixed[exponent][value] = (f < 0xFFFFFFFF ? llrint(f) : 0xFFFFFFFF);
72 #endif
73 #ifdef FLOAT_TABLE
74 442368 expval_table_float[exponent][value] = f;
75 #endif
76 }
77 #ifdef FIXED_TABLE
78 23040 exp_table_fixed[exponent] = expval_table_fixed[exponent][1];
79 #endif
80 #ifdef FLOAT_TABLE
81 27648 exp_table_float[exponent] = expval_table_float[exponent][1];
82 #endif
83 }
84 99 }
85 #undef FLOAT_TABLE
86 #undef FIXED_TABLE
87 #endif /* CONFIG_HARDCODED_TABLES */
88
89 #endif /* AVCODEC_MPEGAUDIO_TABLEGEN_H */
90