FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/qdm2_tablegen.h
Date: 2026-01-16 07:34:38
Exec Total Coverage
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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 #include "qdm2data.h"
30
31 #define SOFTCLIP_THRESHOLD 27600
32 #define HARDCLIP_THRESHOLD 35716
33
34 #if CONFIG_HARDCODED_TABLES
35 #define softclip_table_init()
36 #define rnd_table_init()
37 #define init_noise_samples()
38 #define qdm2_init_vlc()
39 #include "libavcodec/qdm2_tables.h"
40 #else
41 static uint16_t softclip_table[HARDCLIP_THRESHOLD - SOFTCLIP_THRESHOLD + 1];
42 static float noise_table[4096 + 20];
43 static uint8_t random_dequant_index[256][5];
44 static uint8_t random_dequant_type24[128][3];
45 static float noise_samples[128];
46
47 3 static av_cold void softclip_table_init(void) {
48 int i;
49 3 double dfl = SOFTCLIP_THRESHOLD - 32767;
50 3 float delta = 1.0 / -dfl;
51
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 24354 for (i = 0; i < HARDCLIP_THRESHOLD - SOFTCLIP_THRESHOLD + 1; i++)
52 24351 softclip_table[i] = SOFTCLIP_THRESHOLD - ((int)(sin((float)i * delta) * dfl) & 0x0000FFFF);
53 3 }
54
55
56 // random generated table
57 3 static av_cold void rnd_table_init(void) {
58 int i,j;
59 uint32_t ldw;
60 3 uint64_t random_seed = 0;
61 3 float delta = 1.0 / 16384.0;
62
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 12291 for(i = 0; i < 4096 ;i++) {
63 12288 random_seed = random_seed * 214013 + 2531011;
64 12288 noise_table[i] = (delta * (float)(((int32_t)random_seed >> 16) & 0x00007FFF)- 1.0) * 1.3;
65 }
66
67
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 771 for (i = 0; i < 256 ;i++) {
68 768 random_seed = 81;
69 768 ldw = i;
70
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 4608 for (j = 0; j < 5 ;j++) {
71 3840 random_dequant_index[i][j] = ldw / random_seed;
72 3840 ldw %= random_seed;
73 3840 random_seed /= 3;
74 }
75 }
76
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 387 for (i = 0; i < 128 ;i++) {
77 384 random_seed = 25;
78 384 ldw = i;
79
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 1536 for (j = 0; j < 3 ;j++) {
80 1152 random_dequant_type24[i][j] = ldw / random_seed;
81 1152 ldw %= random_seed;
82 1152 random_seed /= 5;
83 }
84 }
85 3 }
86
87
88 3 static av_cold void init_noise_samples(void) {
89 int i;
90 3 unsigned random_seed = 0;
91 3 float delta = 1.0 / 16384.0;
92
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 387 for (i = 0; i < 128;i++) {
93 384 random_seed = random_seed * 214013 + 2531011;
94 384 noise_samples[i] = (delta * (float)((random_seed >> 16) & 0x00007fff) - 1.0);
95 }
96 3 }
97
98 static VLC vlc_tab_level;
99 static VLC vlc_tab_diff;
100 static VLC vlc_tab_run;
101 static VLC fft_level_exp_alt_vlc;
102 static VLC fft_level_exp_vlc;
103 static VLC fft_stereo_exp_vlc;
104 static VLC fft_stereo_phase_vlc;
105 static VLC vlc_tab_tone_level_idx_hi1;
106 static VLC vlc_tab_tone_level_idx_mid;
107 static VLC vlc_tab_tone_level_idx_hi2;
108 static VLC vlc_tab_type30;
109 static VLC vlc_tab_type34;
110 static VLC vlc_tab_fft_tone_offset[5];
111
112 static VLCElem qdm2_table[3838];
113
114 51 static av_cold void build_vlc(VLC *vlc, int nb_bits, int nb_codes,
115 unsigned *offset, const uint8_t tab[][2])
116 {
117 51 vlc->table = &qdm2_table[*offset];
118 51 vlc->table_allocated = FF_ARRAY_ELEMS(qdm2_table) - *offset;
119 51 ff_vlc_init_from_lengths(vlc, nb_bits, nb_codes,
120 51 &tab[0][1], 2, &tab[0][0], 2, 1,
121 -1, VLC_INIT_STATIC_OVERLONG | VLC_INIT_LE, NULL);
122 51 *offset += vlc->table_size;
123 51 }
124
125 3 static av_cold void qdm2_init_vlc(void)
126 {
127 3 const uint8_t (*tab)[2] = tab_fft_tone_offset;
128 3 unsigned offset = 0;
129
130 3 build_vlc(&vlc_tab_level, 8, 24, &offset, tab_level);
131 3 build_vlc(&vlc_tab_diff, 8, 33, &offset, tab_diff);
132 3 build_vlc(&vlc_tab_run, 5, 6, &offset, tab_run);
133
134 3 build_vlc(&fft_level_exp_alt_vlc, 8, 28, &offset, fft_level_exp_alt);
135 3 build_vlc(&fft_level_exp_vlc, 8, 20, &offset, fft_level_exp);
136
137 3 build_vlc(&fft_stereo_exp_vlc, 6, 7, &offset, fft_stereo_exp);
138 3 build_vlc(&fft_stereo_phase_vlc, 6, 9, &offset, fft_stereo_phase);
139
140 3 build_vlc(&vlc_tab_tone_level_idx_hi1, 8, 20, &offset, tab_tone_level_idx_hi1);
141 3 build_vlc(&vlc_tab_tone_level_idx_mid, 8, 13, &offset, tab_tone_level_idx_mid);
142 3 build_vlc(&vlc_tab_tone_level_idx_hi2, 8, 18, &offset, tab_tone_level_idx_hi2);
143
144 3 build_vlc(&vlc_tab_type30, 6, 9, &offset, tab_type30);
145 3 build_vlc(&vlc_tab_type34, 5, 10, &offset, tab_type34);
146
147
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 18 for (int i = 0; i < 5; i++) {
148 15 build_vlc(&vlc_tab_fft_tone_offset[i], 8, tab_fft_tone_offset_sizes[i],
149 &offset, tab);
150 15 tab += tab_fft_tone_offset_sizes[i];
151 }
152 3 }
153
154 #endif /* CONFIG_HARDCODED_TABLES */
155
156 #endif /* AVCODEC_QDM2_TABLEGEN_H */
157