FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/mpegaudiodsp.c
Date: 2026-04-24 10:13:59
Exec Total Coverage
Lines: 39 39 100.0%
Functions: 2 2 100.0%
Branches: 32 32 100.0%
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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 "dct32.h"
27
28 static AVOnce mpadsp_table_init = AV_ONCE_INIT;
29
30 100 static av_cold void mpadsp_init_tabs(void)
31 {
32 int i, j;
33 /* compute mdct windows */
34
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35
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 18000 for (j = 0; j < 4; j++) {
36 double d;
37
38
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 14400 if (j == 2 && i % 3 != 1)
39 2400 continue;
40
41 12000 d = sin(M_PI * (i + 0.5) / 36.0);
42
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 12000 if (j == 1) {
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 3600 if (i >= 30) d = 0;
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 3000 else if (i >= 24) d = sin(M_PI * (i - 18 + 0.5) / 12.0);
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 2400 else if (i >= 18) d = 1;
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 8400 } else if (j == 3) {
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 3600 if (i < 6) d = 0;
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 3000 else if (i < 12) d = sin(M_PI * (i - 6 + 0.5) / 12.0);
49
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 2400 else if (i < 18) d = 1;
50 }
51 //merge last stage of imdct into the window coefficients
52 12000 d *= 0.5 * IMDCT_SCALAR / cos(M_PI * (2 * i + 19) / 72);
53
54
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 12000 if (j == 2) {
55 1200 ff_mdct_win_float[j][i/3] = d / (1 << 5);
56 1200 ff_mdct_win_fixed[j][i/3] = d / (1 << 5) * (1LL << 32) + 0.5;
57 } else {
58
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 10800 int idx = i < 18 ? i : i + (MDCT_BUF_SIZE/2 - 18);
59 10800 ff_mdct_win_float[j][idx] = d / (1 << 5);
60 10800 ff_mdct_win_fixed[j][idx] = d / (1 << 5) * (1LL << 32) + 0.5;
61 }
62 }
63 }
64
65 /* NOTE: we do frequency inversion after the MDCT by changing
66 the sign of the right window coefs */
67
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68
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 8400 for (i = 0; i < MDCT_BUF_SIZE; i += 2) {
69 8000 ff_mdct_win_float[j + 4][i ] = ff_mdct_win_float[j][i ];
70 8000 ff_mdct_win_float[j + 4][i + 1] = -ff_mdct_win_float[j][i + 1];
71 8000 ff_mdct_win_fixed[j + 4][i ] = ff_mdct_win_fixed[j][i ];
72 8000 ff_mdct_win_fixed[j + 4][i + 1] = -ff_mdct_win_fixed[j][i + 1];
73 }
74 }
75
76 #if ARCH_X86
77 100 ff_mpadsp_init_x86_tabs();
78 #endif
79 100 }
80
81 172 av_cold void ff_mpadsp_init(MPADSPContext *s)
82 {
83 172 ff_thread_once(&mpadsp_table_init, &mpadsp_init_tabs);
84
85 172 s->apply_window_float = ff_mpadsp_apply_window_float;
86 172 s->apply_window_fixed = ff_mpadsp_apply_window_fixed;
87
88 172 s->dct32_float = ff_dct32_float;
89 172 s->dct32_fixed = ff_dct32_fixed;
90
91 172 s->imdct36_blocks_float = ff_imdct36_blocks_float;
92 172 s->imdct36_blocks_fixed = ff_imdct36_blocks_fixed;
93
94 #if ARCH_AARCH64
95 ff_mpadsp_init_aarch64(s);
96 #elif ARCH_ARM
97 ff_mpadsp_init_arm(s);
98 #elif ARCH_PPC
99 ff_mpadsp_init_ppc(s);
100 #elif ARCH_X86
101 172 ff_mpadsp_init_x86(s);
102 #endif
103 #if HAVE_MIPSFPU
104 ff_mpadsp_init_mipsfpu(s);
105 #endif
106 #if HAVE_MIPSDSP
107 ff_mpadsp_init_mipsdsp(s);
108 #endif
109 172 }
110