FFmpeg
qdm2_tablegen.h
Go to the documentation of this file.
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
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 static av_cold void softclip_table_init(void) {
48  int i;
49  double dfl = SOFTCLIP_THRESHOLD - 32767;
50  float delta = 1.0 / -dfl;
51  for (i = 0; i < HARDCLIP_THRESHOLD - SOFTCLIP_THRESHOLD + 1; i++)
52  softclip_table[i] = SOFTCLIP_THRESHOLD - ((int)(sin((float)i * delta) * dfl) & 0x0000FFFF);
53 }
54 
55 
56 // random generated table
57 static av_cold void rnd_table_init(void) {
58  int i,j;
59  uint32_t ldw;
60  uint64_t random_seed = 0;
61  float delta = 1.0 / 16384.0;
62  for(i = 0; i < 4096 ;i++) {
63  random_seed = random_seed * 214013 + 2531011;
64  noise_table[i] = (delta * (float)(((int32_t)random_seed >> 16) & 0x00007FFF)- 1.0) * 1.3;
65  }
66 
67  for (i = 0; i < 256 ;i++) {
68  random_seed = 81;
69  ldw = i;
70  for (j = 0; j < 5 ;j++) {
71  random_dequant_index[i][j] = ldw / random_seed;
72  ldw %= random_seed;
73  random_seed /= 3;
74  }
75  }
76  for (i = 0; i < 128 ;i++) {
77  random_seed = 25;
78  ldw = i;
79  for (j = 0; j < 3 ;j++) {
80  random_dequant_type24[i][j] = ldw / random_seed;
81  ldw %= random_seed;
82  random_seed /= 5;
83  }
84  }
85 }
86 
87 
88 static av_cold void init_noise_samples(void) {
89  int i;
90  unsigned random_seed = 0;
91  float delta = 1.0 / 16384.0;
92  for (i = 0; i < 128;i++) {
93  random_seed = random_seed * 214013 + 2531011;
94  noise_samples[i] = (delta * (float)((random_seed >> 16) & 0x00007fff) - 1.0);
95  }
96 }
97 
111 
112 static VLC_TYPE qdm2_table[3838][2];
113 
114 static av_cold void build_vlc(VLC *vlc, int nb_bits, int nb_codes,
115  unsigned *offset, const uint8_t tab[][2])
116 {
117  vlc->table = &qdm2_table[*offset];
119  ff_init_vlc_from_lengths(vlc, nb_bits, nb_codes,
120  &tab[0][1], 2, &tab[0][0], 2, 1,
122  *offset += vlc->table_size;
123 }
124 
125 static av_cold void qdm2_init_vlc(void)
126 {
127  const uint8_t (*tab)[2] = tab_fft_tone_offset;
128  unsigned offset = 0;
129 
132  build_vlc(&vlc_tab_run, 5, 6, &offset, tab_run);
133 
136 
139 
143 
146 
147  for (int i = 0; i < 5; i++) {
149  &offset, tab);
151  }
152 }
153 
154 #endif /* CONFIG_HARDCODED_TABLES */
155 
156 #endif /* AVCODEC_QDM2_TABLEGEN_H */
fft_stereo_exp_vlc
static VLC fft_stereo_exp_vlc
Definition: qdm2_tablegen.h:103
qdm2_table
static VLC_TYPE qdm2_table[3838][2]
Definition: qdm2_tablegen.h:112
vlc_tab_type30
static VLC vlc_tab_type30
Definition: qdm2_tablegen.h:108
vlc_tab_type34
static VLC vlc_tab_type34
Definition: qdm2_tablegen.h:109
random_dequant_index
static uint8_t random_dequant_index[256][5]
Definition: qdm2_tablegen.h:43
tab_run
static const uint8_t tab_run[6][2]
Definition: qdm2data.h:56
vlc_tab_tone_level_idx_hi1
static VLC vlc_tab_tone_level_idx_hi1
Definition: qdm2_tablegen.h:105
SOFTCLIP_THRESHOLD
#define SOFTCLIP_THRESHOLD
Definition: qdm2_tablegen.h:31
tab_diff
static const uint8_t tab_diff[33][2]
Definition: qdm2data.h:46
INIT_VLC_LE
#define INIT_VLC_LE
Definition: vlc.h:94
softclip_table
static uint16_t softclip_table[HARDCLIP_THRESHOLD - SOFTCLIP_THRESHOLD+1]
Definition: qdm2_tablegen.h:41
noise_table
static float noise_table[4096+20]
Definition: qdm2_tablegen.h:42
init_noise_samples
static av_cold void init_noise_samples(void)
Definition: qdm2_tablegen.h:88
VLC_TYPE
#define VLC_TYPE
Definition: vlc.h:24
tab
static const struct twinvq_data tab
Definition: twinvq_data.h:10345
vlc_tab_level
static VLC vlc_tab_level
Definition: qdm2_tablegen.h:98
rnd_table_init
static av_cold void rnd_table_init(void)
Definition: qdm2_tablegen.h:57
vlc_tab_run
static VLC vlc_tab_run
Definition: qdm2_tablegen.h:100
ff_init_vlc_from_lengths
int ff_init_vlc_from_lengths(VLC *vlc_arg, int nb_bits, int nb_codes, const int8_t *lens, int lens_wrap, const void *symbols, int symbols_wrap, int symbols_size, int offset, int flags, void *logctx)
Build VLC decoding tables suitable for use with get_vlc2()
Definition: bitstream.c:381
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
av_cold
#define av_cold
Definition: attributes.h:90
fft_level_exp_alt
static const uint8_t fft_level_exp_alt[28][2]
FFT TABLES.
Definition: qdm2data.h:137
HARDCLIP_THRESHOLD
#define HARDCLIP_THRESHOLD
Definition: qdm2_tablegen.h:32
tab_fft_tone_offset_sizes
static const uint8_t tab_fft_tone_offset_sizes[]
Definition: qdm2data.h:94
NULL
#define NULL
Definition: coverity.c:32
tab_type34
static const uint8_t tab_type34[10][2]
Definition: qdm2data.h:89
fft_stereo_phase_vlc
static VLC fft_stereo_phase_vlc
Definition: qdm2_tablegen.h:104
fft_stereo_exp
static const uint8_t fft_stereo_exp[7][2]
Definition: qdm2data.h:154
fft_stereo_phase
static const uint8_t fft_stereo_phase[9][2]
Definition: qdm2data.h:159
tab_level
static const uint8_t tab_level[24][2]
VLC TABLES.
Definition: qdm2data.h:38
VLC::table_allocated
int table_allocated
Definition: vlc.h:29
qdm2data.h
tab_tone_level_idx_hi1
static const uint8_t tab_tone_level_idx_hi1[20][2]
Definition: qdm2data.h:61
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
attributes.h
random_dequant_type24
static uint8_t random_dequant_type24[128][3]
Definition: qdm2_tablegen.h:44
vlc_tab_tone_level_idx_mid
static VLC vlc_tab_tone_level_idx_mid
Definition: qdm2_tablegen.h:106
vlc_tab_tone_level_idx_hi2
static VLC vlc_tab_tone_level_idx_hi2
Definition: qdm2_tablegen.h:107
fft_level_exp
static const uint8_t fft_level_exp[20][2]
Definition: qdm2data.h:146
i
int i
Definition: input.c:406
delta
float delta
Definition: vorbis_enc_data.h:430
qdm2_init_vlc
static av_cold void qdm2_init_vlc(void)
Definition: qdm2_tablegen.h:125
fft_level_exp_alt_vlc
static VLC fft_level_exp_alt_vlc
Definition: qdm2_tablegen.h:101
INIT_VLC_STATIC_OVERLONG
#define INIT_VLC_STATIC_OVERLONG
Definition: vlc.h:96
tab_fft_tone_offset
static const uint8_t tab_fft_tone_offset[][2]
Definition: qdm2data.h:98
tab_tone_level_idx_hi2
static const uint8_t tab_tone_level_idx_hi2[18][2]
Definition: qdm2data.h:76
fft_level_exp_vlc
static VLC fft_level_exp_vlc
Definition: qdm2_tablegen.h:102
noise_samples
static float noise_samples[128]
Definition: qdm2_tablegen.h:45
VLC
Definition: vlc.h:26
tab_type30
static const uint8_t tab_type30[9][2]
Definition: qdm2data.h:83
VLC::table_size
int table_size
Definition: vlc.h:29
vlc_tab_diff
static VLC vlc_tab_diff
Definition: qdm2_tablegen.h:99
tab_tone_level_idx_mid
static const uint8_t tab_tone_level_idx_mid[13][2]
Definition: qdm2data.h:69
vlc_tab_fft_tone_offset
static VLC vlc_tab_fft_tone_offset[5]
Definition: qdm2_tablegen.h:110
int32_t
int32_t
Definition: audioconvert.c:56
build_vlc
static av_cold void build_vlc(VLC *vlc, int nb_bits, int nb_codes, unsigned *offset, const uint8_t tab[][2])
Definition: qdm2_tablegen.h:114
VLC::table
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
softclip_table_init
static av_cold void softclip_table_init(void)
Definition: qdm2_tablegen.h:47