GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/aactab.h Lines: 17 17 100.0 %
Date: 2019-11-22 03:34:36 Branches: 6 6 100.0 %

Line Branch Exec Source
1
/*
2
 * AAC data declarations
3
 * Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org )
4
 * Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov gmail com )
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
/**
24
 * @file
25
 * AAC data declarations
26
 * @author Oded Shimon  ( ods15 ods15 dyndns org )
27
 * @author Maxim Gavrilov ( maxim.gavrilov gmail com )
28
 */
29
30
#ifndef AVCODEC_AACTAB_H
31
#define AVCODEC_AACTAB_H
32
33
#include "libavutil/mem.h"
34
#include "aac.h"
35
36
#include <stdint.h>
37
38
/* NOTE:
39
 * Tables in this file are shared by the AAC decoders and encoder
40
 */
41
42
extern float ff_aac_pow2sf_tab[428];
43
extern float ff_aac_pow34sf_tab[428];
44
45
175
static inline void ff_aac_tableinit(void)
46
{
47
    int i;
48
49
    /* 2^(i/16) for 0 <= i <= 15 */
50
    static const float exp2_lut[] = {
51
        1.00000000000000000000,
52
        1.04427378242741384032,
53
        1.09050773266525765921,
54
        1.13878863475669165370,
55
        1.18920711500272106672,
56
        1.24185781207348404859,
57
        1.29683955465100966593,
58
        1.35425554693689272830,
59
        1.41421356237309504880,
60
        1.47682614593949931139,
61
        1.54221082540794082361,
62
        1.61049033194925430818,
63
        1.68179283050742908606,
64
        1.75625216037329948311,
65
        1.83400808640934246349,
66
        1.91520656139714729387,
67
    };
68
175
    float t1 = 8.8817841970012523233890533447265625e-16; // 2^(-50)
69
175
    float t2 = 3.63797880709171295166015625e-12; // 2^(-38)
70
    int t1_inc_cur, t2_inc_cur;
71
175
    int t1_inc_prev = 0;
72
175
    int t2_inc_prev = 8;
73
74
75075
    for (i = 0; i < 428; i++) {
75
74900
        t1_inc_cur = 4 * (i % 4);
76
74900
        t2_inc_cur = (8 + 3*i) % 16;
77
74900
        if (t1_inc_cur < t1_inc_prev)
78
18550
            t1 *= 2;
79
74900
        if (t2_inc_cur < t2_inc_prev)
80
14000
            t2 *= 2;
81
        // A much more efficient and accurate way of doing:
82
        // ff_aac_pow2sf_tab[i] = pow(2, (i - POW_SF2_ZERO) / 4.0);
83
        // ff_aac_pow34sf_tab[i] = pow(ff_aac_pow2sf_tab[i], 3.0/4.0);
84
74900
        ff_aac_pow2sf_tab[i] = t1 * exp2_lut[t1_inc_cur];
85
74900
        ff_aac_pow34sf_tab[i] = t2 * exp2_lut[t2_inc_cur];
86
74900
        t1_inc_prev = t1_inc_cur;
87
74900
        t2_inc_prev = t2_inc_cur;
88
    }
89
175
}
90
91
/* @name ltp_coef
92
 * Table of the LTP coefficients
93
 */
94
static const INTFLOAT ltp_coef[8] = {
95
    Q30(0.570829), Q30(0.696616), Q30(0.813004), Q30(0.911304),
96
    Q30(0.984900), Q30(1.067894), Q30(1.194601), Q30(1.369533),
97
};
98
99
/* @name tns_tmp2_map
100
 * Tables of the tmp2[] arrays of LPC coefficients used for TNS.
101
 * The suffix _M_N[] indicate the values of coef_compress and coef_res
102
 * respectively.
103
 * @{
104
 */
105
static const INTFLOAT tns_tmp2_map_1_3[4] = {
106
    Q31(0.00000000), Q31(-0.43388373),  Q31(0.64278758),  Q31(0.34202015),
107
};
108
109
static const INTFLOAT tns_tmp2_map_0_3[8] = {
110
    Q31(0.00000000), Q31(-0.43388373), Q31(-0.78183150), Q31(-0.97492790),
111
    Q31(0.98480773), Q31( 0.86602539), Q31( 0.64278758), Q31( 0.34202015),
112
};
113
114
static const INTFLOAT tns_tmp2_map_1_4[8] = {
115
    Q31(0.00000000), Q31(-0.20791170), Q31(-0.40673664), Q31(-0.58778524),
116
    Q31(0.67369562), Q31( 0.52643216), Q31( 0.36124167), Q31( 0.18374951),
117
};
118
119
static const INTFLOAT tns_tmp2_map_0_4[16] = {
120
    Q31( 0.00000000), Q31(-0.20791170), Q31(-0.40673664), Q31(-0.58778524),
121
    Q31(-0.74314481), Q31(-0.86602539), Q31(-0.95105654), Q31(-0.99452192),
122
    Q31( 0.99573416), Q31( 0.96182561), Q31( 0.89516330), Q31( 0.79801720),
123
    Q31( 0.67369562), Q31( 0.52643216), Q31( 0.36124167), Q31( 0.18374951),
124
};
125
126
static const INTFLOAT * const tns_tmp2_map[4] = {
127
    tns_tmp2_map_0_3,
128
    tns_tmp2_map_0_4,
129
    tns_tmp2_map_1_3,
130
    tns_tmp2_map_1_4
131
};
132
// @}
133
134
/* @name window coefficients
135
 * @{
136
 */
137
DECLARE_ALIGNED(32, extern float,  ff_aac_kbd_long_1024)[1024];
138
DECLARE_ALIGNED(32, extern float,  ff_aac_kbd_short_128)[128];
139
DECLARE_ALIGNED(32, extern float,  ff_aac_kbd_long_960)[960];
140
DECLARE_ALIGNED(32, extern float,  ff_aac_kbd_short_120)[120];
141
DECLARE_ALIGNED(32, extern int,    ff_aac_kbd_long_1024_fixed)[1024];
142
DECLARE_ALIGNED(32, extern int,    ff_aac_kbd_long_512_fixed)[512];
143
DECLARE_ALIGNED(32, extern int,    ff_aac_kbd_short_128_fixed)[128];
144
DECLARE_ALIGNED(32, extern const float, ff_aac_eld_window_512)[1920];
145
DECLARE_ALIGNED(32, extern const int,   ff_aac_eld_window_512_fixed)[1920];
146
DECLARE_ALIGNED(32, extern const float, ff_aac_eld_window_480)[1800];
147
DECLARE_ALIGNED(32, extern const int,   ff_aac_eld_window_480_fixed)[1800];
148
// @}
149
150
/* @name number of scalefactor window bands for long and short transform windows respectively
151
 * @{
152
 */
153
extern const uint8_t ff_aac_num_swb_1024[];
154
extern const uint8_t ff_aac_num_swb_960 [];
155
extern const uint8_t ff_aac_num_swb_512 [];
156
extern const uint8_t ff_aac_num_swb_480 [];
157
extern const uint8_t ff_aac_num_swb_128 [];
158
extern const uint8_t ff_aac_num_swb_120 [];
159
// @}
160
161
extern const uint8_t ff_aac_pred_sfb_max [];
162
163
extern const uint32_t ff_aac_scalefactor_code[121];
164
extern const uint8_t  ff_aac_scalefactor_bits[121];
165
166
extern const uint16_t * const ff_aac_spectral_codes[11];
167
extern const uint8_t  * const ff_aac_spectral_bits [11];
168
extern const uint16_t  ff_aac_spectral_sizes[11];
169
170
extern const float *ff_aac_codebook_vectors[];
171
extern const float *ff_aac_codebook_vector_vals[];
172
extern const uint16_t *ff_aac_codebook_vector_idx[];
173
174
extern const uint16_t * const ff_swb_offset_1024[13];
175
extern const uint16_t * const ff_swb_offset_960 [13];
176
extern const uint16_t * const ff_swb_offset_512 [13];
177
extern const uint16_t * const ff_swb_offset_480 [13];
178
extern const uint16_t * const ff_swb_offset_128 [13];
179
extern const uint16_t * const ff_swb_offset_120 [13];
180
181
extern const uint8_t ff_tns_max_bands_1024[13];
182
extern const uint8_t ff_tns_max_bands_512 [13];
183
extern const uint8_t ff_tns_max_bands_480 [13];
184
extern const uint8_t ff_tns_max_bands_128 [13];
185
186
#endif /* AVCODEC_AACTAB_H */