1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
21
23 {
24 int i;
25
26 #define TEST_MATCH(frame_rate, code, ext_n, ext_d) do { \
27 AVRational fr = frame_rate; \
28 int c, n, d; \
29 ff_mpeg12_find_best_frame_rate(fr, &c, &n, &d, 0); \
30 if (c != code || n != ext_n || d != ext_d) { \
31 av_log(NULL, AV_LOG_ERROR, "Failed to match %d/%d: " \
32 "code = %d, ext_n = %d, ext_d = %d.\n", \
33 fr.num, fr.den, c, n, d); \
34 return 1; \
35 } \
36 } while (0)
37 #define TEST_EXACT(frn, frd) do { \
38 AVRational fr = (AVRational) { frn, frd }; \
39 int c, n, d; \
40 ff_mpeg12_find_best_frame_rate(fr, &c, &n, &d, 0); \
41 if (av_cmp_q(fr, av_mul_q(ff_mpeg12_frame_rate_tab[c], \
42 (AVRational) { n + 1, d + 1 })) != 0) { \
43 av_log(NULL, AV_LOG_ERROR, "Failed to find exact %d/%d: " \
44 "code = %d, ext_n = %d, ext_d = %d.\n", \
45 fr.num, fr.den, c, n, d); \
46 return 1; \
47 } \
48 } while (0)
49
50 // Framerates in the table must be chosen exactly.
51 for (i = 1; i <= 8; i++)
53
54 // As should the same ones with small perturbations.
55 // (1/1000 used here to be smaller than half the difference
56 // between 24 and 24000/1001.)
57 for (i = 1; i <= 8; i++) {
62 }
63
64 // Exactly constructable framerates should be exact. Note that some
65 // values can be made in multiple ways (e.g. 12 = 24 / 2 == 60 / 5),
66 // and there is no reason to favour any particular choice.
76
77 // Values higher than 240 (the highest representable, as 60 * 4 / 1)
78 // should be mapped to 240.
79 for (i = 240; i < 1000; i += 10)
81 // Values lower than 24000/32032 (the lowest representable, as
82 // 24000/1001 * 1 / 32) should be mapped to 24000/32032.
83 for (i = 74; i > 0; i--)
85
86 return 0;
87 }
#define TEST_EXACT(frn, frd)
#define TEST_MATCH(frame_rate, code, ext_n, ext_d)
AVRational av_sub_q(AVRational b, AVRational c)
Subtract one rational from another.
Rational number (pair of numerator and denominator).
AVRational av_add_q(AVRational b, AVRational c)
Add two rationals.
const AVRational ff_mpeg12_frame_rate_tab[16]