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1 | /* |
2 | * Header file for hardcoded QDM2 tables | |
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_QDM2_TABLEGEN_H | |
24 | #define AVCODEC_QDM2_TABLEGEN_H | |
25 | ||
26 | #include <stdint.h> | |
27 | #include <math.h> | |
28 | #include "libavutil/attributes.h" | |
29 | ||
30 | #define SOFTCLIP_THRESHOLD 27600 | |
31 | #define HARDCLIP_THRESHOLD 35716 | |
32 | ||
33 | #if CONFIG_HARDCODED_TABLES | |
34 | #define softclip_table_init() | |
35 | #define rnd_table_init() | |
36 | #define init_noise_samples() | |
37 | #include "libavcodec/qdm2_tables.h" | |
38 | #else | |
39 | static uint16_t softclip_table[HARDCLIP_THRESHOLD - SOFTCLIP_THRESHOLD + 1]; | |
40 | static float noise_table[4096 + 20]; | |
41 | static uint8_t random_dequant_index[256][5]; | |
42 | static uint8_t random_dequant_type24[128][3]; | |
43 | static float noise_samples[128]; | |
44 | ||
45 | static av_cold void softclip_table_init(void) { | |
46 | int i; | |
47 | double dfl = SOFTCLIP_THRESHOLD - 32767; | |
48 | float delta = 1.0 / -dfl; | |
49 | for (i = 0; i < HARDCLIP_THRESHOLD - SOFTCLIP_THRESHOLD + 1; i++) | |
50 | softclip_table[i] = SOFTCLIP_THRESHOLD - ((int)(sin((float)i * delta) * dfl) & 0x0000FFFF); | |
51 | } | |
52 | ||
53 | ||
54 | // random generated table | |
55 | static av_cold void rnd_table_init(void) { | |
56 | int i,j; | |
57 | uint32_t ldw; | |
58 | uint64_t random_seed = 0; | |
59 | float delta = 1.0 / 16384.0; | |
60 | for(i = 0; i < 4096 ;i++) { | |
61 | random_seed = random_seed * 214013 + 2531011; | |
62 | noise_table[i] = (delta * (float)(((int32_t)random_seed >> 16) & 0x00007FFF)- 1.0) * 1.3; | |
63 | } | |
64 | ||
65 | for (i = 0; i < 256 ;i++) { | |
66 | random_seed = 81; | |
67 | ldw = i; | |
68 | for (j = 0; j < 5 ;j++) { | |
69 | random_dequant_index[i][j] = ldw / random_seed; | |
70 | ldw %= random_seed; | |
71 | random_seed /= 3; | |
72 | } | |
73 | } | |
74 | for (i = 0; i < 128 ;i++) { | |
75 | random_seed = 25; | |
76 | ldw = i; | |
77 | for (j = 0; j < 3 ;j++) { | |
78 | random_dequant_type24[i][j] = ldw / random_seed; | |
79 | ldw %= random_seed; | |
80 | random_seed /= 5; | |
81 | } | |
82 | } | |
83 | } | |
84 | ||
85 | ||
86 | static av_cold void init_noise_samples(void) { | |
87 | int i; | |
88 | unsigned random_seed = 0; | |
89 | float delta = 1.0 / 16384.0; | |
90 | for (i = 0; i < 128;i++) { | |
91 | random_seed = random_seed * 214013 + 2531011; | |
92 | noise_samples[i] = (delta * (float)((random_seed >> 16) & 0x00007fff) - 1.0); | |
93 | } | |
94 | } | |
95 | #endif /* CONFIG_HARDCODED_TABLES */ | |
96 | ||
97 | #endif /* AVCODEC_QDM2_TABLEGEN_H */ |