1 |
|
|
/* |
2 |
|
|
* Copyright (c) 2011 Mans Rullgard |
3 |
|
|
* |
4 |
|
|
* This file is part of FFmpeg. |
5 |
|
|
* |
6 |
|
|
* FFmpeg is free software; you can redistribute it and/or |
7 |
|
|
* modify it under the terms of the GNU Lesser General Public |
8 |
|
|
* License as published by the Free Software Foundation; either |
9 |
|
|
* version 2.1 of the License, or (at your option) any later version. |
10 |
|
|
* |
11 |
|
|
* FFmpeg is distributed in the hope that it will be useful, |
12 |
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 |
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 |
|
|
* Lesser General Public License for more details. |
15 |
|
|
* |
16 |
|
|
* You should have received a copy of the GNU Lesser General Public |
17 |
|
|
* License along with FFmpeg; if not, write to the Free Software |
18 |
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
19 |
|
|
*/ |
20 |
|
|
|
21 |
|
|
#include "config.h" |
22 |
|
|
#include "libavutil/attributes.h" |
23 |
|
|
#include "libavutil/thread.h" |
24 |
|
|
#include "mpegaudio.h" |
25 |
|
|
#include "mpegaudiodsp.h" |
26 |
|
|
#include "dct.h" |
27 |
|
|
#include "dct32.h" |
28 |
|
|
|
29 |
|
|
static AVOnce mpadsp_table_init = AV_ONCE_INIT; |
30 |
|
|
|
31 |
|
85 |
static av_cold void mpadsp_init_tabs(void) |
32 |
|
|
{ |
33 |
|
|
int i, j; |
34 |
|
|
/* compute mdct windows */ |
35 |
✓✓ |
3145 |
for (i = 0; i < 36; i++) { |
36 |
✓✓ |
15300 |
for (j = 0; j < 4; j++) { |
37 |
|
|
double d; |
38 |
|
|
|
39 |
✓✓✓✓
|
12240 |
if (j == 2 && i % 3 != 1) |
40 |
|
2040 |
continue; |
41 |
|
|
|
42 |
|
10200 |
d = sin(M_PI * (i + 0.5) / 36.0); |
43 |
✓✓ |
10200 |
if (j == 1) { |
44 |
✓✓ |
3060 |
if (i >= 30) d = 0; |
45 |
✓✓ |
2550 |
else if (i >= 24) d = sin(M_PI * (i - 18 + 0.5) / 12.0); |
46 |
✓✓ |
2040 |
else if (i >= 18) d = 1; |
47 |
✓✓ |
7140 |
} else if (j == 3) { |
48 |
✓✓ |
3060 |
if (i < 6) d = 0; |
49 |
✓✓ |
2550 |
else if (i < 12) d = sin(M_PI * (i - 6 + 0.5) / 12.0); |
50 |
✓✓ |
2040 |
else if (i < 18) d = 1; |
51 |
|
|
} |
52 |
|
|
//merge last stage of imdct into the window coefficients |
53 |
|
10200 |
d *= 0.5 * IMDCT_SCALAR / cos(M_PI * (2 * i + 19) / 72); |
54 |
|
|
|
55 |
✓✓ |
10200 |
if (j == 2) { |
56 |
|
1020 |
ff_mdct_win_float[j][i/3] = d / (1 << 5); |
57 |
|
1020 |
ff_mdct_win_fixed[j][i/3] = d / (1 << 5) * (1LL << 32) + 0.5; |
58 |
|
|
} else { |
59 |
✓✓ |
9180 |
int idx = i < 18 ? i : i + (MDCT_BUF_SIZE/2 - 18); |
60 |
|
9180 |
ff_mdct_win_float[j][idx] = d / (1 << 5); |
61 |
|
9180 |
ff_mdct_win_fixed[j][idx] = d / (1 << 5) * (1LL << 32) + 0.5; |
62 |
|
|
} |
63 |
|
|
} |
64 |
|
|
} |
65 |
|
|
|
66 |
|
|
/* NOTE: we do frequency inversion after the MDCT by changing |
67 |
|
|
the sign of the right window coefs */ |
68 |
✓✓ |
425 |
for (j = 0; j < 4; j++) { |
69 |
✓✓ |
7140 |
for (i = 0; i < MDCT_BUF_SIZE; i += 2) { |
70 |
|
6800 |
ff_mdct_win_float[j + 4][i ] = ff_mdct_win_float[j][i ]; |
71 |
|
6800 |
ff_mdct_win_float[j + 4][i + 1] = -ff_mdct_win_float[j][i + 1]; |
72 |
|
6800 |
ff_mdct_win_fixed[j + 4][i ] = ff_mdct_win_fixed[j][i ]; |
73 |
|
6800 |
ff_mdct_win_fixed[j + 4][i + 1] = -ff_mdct_win_fixed[j][i + 1]; |
74 |
|
|
} |
75 |
|
|
} |
76 |
|
|
|
77 |
|
|
if (ARCH_X86) |
78 |
|
85 |
ff_mpadsp_init_x86_tabs(); |
79 |
|
85 |
} |
80 |
|
|
|
81 |
|
152 |
av_cold void ff_mpadsp_init(MPADSPContext *s) |
82 |
|
|
{ |
83 |
|
|
DCTContext dct; |
84 |
|
|
|
85 |
|
152 |
ff_dct_init(&dct, 5, DCT_II); |
86 |
|
152 |
ff_thread_once(&mpadsp_table_init, &mpadsp_init_tabs); |
87 |
|
|
|
88 |
|
152 |
s->apply_window_float = ff_mpadsp_apply_window_float; |
89 |
|
152 |
s->apply_window_fixed = ff_mpadsp_apply_window_fixed; |
90 |
|
|
|
91 |
|
152 |
s->dct32_float = dct.dct32; |
92 |
|
152 |
s->dct32_fixed = ff_dct32_fixed; |
93 |
|
|
|
94 |
|
152 |
s->imdct36_blocks_float = ff_imdct36_blocks_float; |
95 |
|
152 |
s->imdct36_blocks_fixed = ff_imdct36_blocks_fixed; |
96 |
|
|
|
97 |
|
|
if (ARCH_AARCH64) ff_mpadsp_init_aarch64(s); |
98 |
|
|
if (ARCH_ARM) ff_mpadsp_init_arm(s); |
99 |
|
|
if (ARCH_PPC) ff_mpadsp_init_ppc(s); |
100 |
|
152 |
if (ARCH_X86) ff_mpadsp_init_x86(s); |
101 |
|
|
if (HAVE_MIPSFPU) ff_mpadsp_init_mipsfpu(s); |
102 |
|
|
if (HAVE_MIPSDSP) ff_mpadsp_init_mipsdsp(s); |
103 |
|
152 |
} |