FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavutil/timecode.c
Date: 2025-03-08 20:38:41
Exec Total Coverage
Lines: 106 123 86.2%
Functions: 12 14 85.7%
Branches: 40 56 71.4%
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1 /*
2 * Copyright (c) 2006 Smartjog S.A.S, Baptiste Coudurier <baptiste.coudurier@gmail.com>
3 * Copyright (c) 2011-2012 Smartjog S.A.S, Clément Bœsch <clement.boesch@smartjog.com>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * Timecode helpers
25 * @see https://en.wikipedia.org/wiki/SMPTE_time_code
26 * @see http://www.dropframetimecode.org
27 */
28
29 #include <stdio.h>
30 #include "common.h"
31 #include "timecode.h"
32 #include "timecode_internal.h"
33 #include "log.h"
34 #include "error.h"
35
36 3536 int av_timecode_adjust_ntsc_framenum2(int framenum, int fps)
37 {
38 /* only works for multiples of NTSC 29.97 */
39 3536 int drop_frames = 0;
40 int d, m, frames_per_10mins;
41
42
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 3536 if (fps && fps % 30 == 0) {
43 3536 drop_frames = fps / 30 * 2;
44 3536 frames_per_10mins = fps / 30 * 17982;
45 } else
46 ✗ return framenum;
47
48 3536 d = framenum / frames_per_10mins;
49 3536 m = framenum % frames_per_10mins;
50
51 3536 return framenum + 9U * drop_frames * d + drop_frames * ((m - drop_frames) / (frames_per_10mins / 10));
52 }
53
54 270142 uint32_t av_timecode_get_smpte_from_framenum(const AVTimecode *tc, int framenum)
55 {
56 270142 unsigned fps = tc->fps;
57 270142 int drop = !!(tc->flags & AV_TIMECODE_FLAG_DROPFRAME);
58 int hh, mm, ss, ff;
59
60 270142 framenum += tc->start;
61
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 270142 if (drop)
62 3515 framenum = av_timecode_adjust_ntsc_framenum2(framenum, tc->fps);
63 270142 ff = framenum % fps;
64 270142 ss = framenum / fps % 60;
65 270142 mm = framenum / (fps*60LL) % 60;
66 270142 hh = framenum / (fps*3600LL) % 24;
67 270142 return av_timecode_get_smpte(tc->rate, drop, hh, mm, ss, ff);
68 }
69
70 271118 uint32_t av_timecode_get_smpte(AVRational rate, int drop, int hh, int mm, int ss, int ff)
71 {
72 271118 uint32_t tc = 0;
73
74 /* For SMPTE 12-M timecodes, frame count is a special case if > 30 FPS.
75 See SMPTE ST 12-1:2014 Sec 12.1 for more info. */
76
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 271118 if (av_cmp_q(rate, (AVRational) {30, 1}) == 1) {
77
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 57628 if (ff % 2 == 1) {
78
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 28802 if (av_cmp_q(rate, (AVRational) {50, 1}) == 0)
79 28800 tc |= (1 << 7);
80 else
81 2 tc |= (1 << 23);
82 }
83 57628 ff /= 2;
84 }
85
86 271118 hh = hh % 24;
87 271118 mm = av_clip(mm, 0, 59);
88 271118 ss = av_clip(ss, 0, 59);
89 271118 ff = ff % 40;
90
91 271118 tc |= drop << 30;
92 271118 tc |= (ff / 10) << 28;
93 271118 tc |= (ff % 10) << 24;
94 271118 tc |= (ss / 10) << 20;
95 271118 tc |= (ss % 10) << 16;
96 271118 tc |= (mm / 10) << 12;
97 271118 tc |= (mm % 10) << 8;
98 271118 tc |= (hh / 10) << 4;
99 271118 tc |= (hh % 10);
100
101 271118 return tc;
102 }
103
104 126 char *av_timecode_make_string(const AVTimecode *tc, char *buf, int framenum_arg)
105 {
106 126 int fps = tc->fps;
107 126 int drop = tc->flags & AV_TIMECODE_FLAG_DROPFRAME;
108 126 int hh, mm, ss, ff, ff_len, neg = 0;
109 126 int64_t framenum = framenum_arg;
110
111 126 framenum += tc->start;
112
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 126 if (drop)
113 12 framenum = av_timecode_adjust_ntsc_framenum2(framenum, fps);
114
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 126 if (framenum < 0) {
115 ✗ framenum = -framenum;
116 ✗ neg = tc->flags & AV_TIMECODE_FLAG_ALLOWNEGATIVE;
117 }
118 126 ff = framenum % fps;
119 126 ss = framenum / fps % 60;
120 126 mm = framenum / (fps*60LL) % 60;
121 126 hh = framenum / (fps*3600LL);
122
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 126 if (tc->flags & AV_TIMECODE_FLAG_24HOURSMAX)
123 1 hh = hh % 24;
124
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 126 ff_len = fps > 10000 ? 5 : fps > 1000 ? 4 : fps > 100 ? 3 : fps > 10 ? 2 : 1;
125
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 126 snprintf(buf, AV_TIMECODE_STR_SIZE, "%s%02d:%02d:%02d%c%0*d",
126 neg ? "-" : "",
127 hh, mm, ss, drop ? ';' : ':', ff_len, ff);
128 126 return buf;
129 }
130
131 1026 char *av_timecode_make_smpte_tc_string2(char *buf, AVRational rate, uint32_t tcsmpte, int prevent_df, int skip_field)
132 {
133 unsigned hh, mm, ss, ff, drop;
134 1026 ff_timecode_set_smpte(&drop, &hh, &mm, &ss, &ff, rate, tcsmpte, prevent_df, skip_field);
135
136 1026 snprintf(buf, AV_TIMECODE_STR_SIZE, "%02u:%02u:%02u%c%02u",
137
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 1026 hh, mm, ss, drop ? ';' : ':', ff);
138 1026 return buf;
139
140 }
141
142 ✗ char *av_timecode_make_smpte_tc_string(char *buf, uint32_t tcsmpte, int prevent_df)
143 {
144 ✗ return av_timecode_make_smpte_tc_string2(buf, (AVRational){30, 1}, tcsmpte, prevent_df, 1);
145 }
146
147 374 char *av_timecode_make_mpeg_tc_string(char *buf, uint32_t tc25bit)
148 {
149 374 snprintf(buf, AV_TIMECODE_STR_SIZE,
150 "%02"PRIu32":%02"PRIu32":%02"PRIu32"%c%02"PRIu32,
151 374 tc25bit>>19 & 0x1f, // 5-bit hours
152 374 tc25bit>>13 & 0x3f, // 6-bit minutes
153 374 tc25bit>>6 & 0x3f, // 6-bit seconds
154
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 374 tc25bit & 1<<24 ? ';' : ':', // 1-bit drop flag
155 tc25bit & 0x3f); // 6-bit frames
156 374 return buf;
157 }
158
159 182 static int check_fps(int fps)
160 {
161 int i;
162 static const int supported_fps[] = {
163 24, 25, 30, 48, 50, 60, 100, 120, 150,
164 };
165
166
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 422 for (i = 0; i < FF_ARRAY_ELEMS(supported_fps); i++)
167
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 422 if (fps == supported_fps[i])
168 182 return 0;
169 ✗ return -1;
170 }
171
172 182 static int check_timecode(void *log_ctx, AVTimecode *tc)
173 {
174
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 182 if ((int)tc->fps <= 0) {
175 ✗ av_log(log_ctx, AV_LOG_ERROR, "Valid timecode frame rate must be specified. Minimum value is 1\n");
176 ✗ return AVERROR(EINVAL);
177 }
178
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 182 if ((tc->flags & AV_TIMECODE_FLAG_DROPFRAME) && tc->fps % 30 != 0) {
179 ✗ av_log(log_ctx, AV_LOG_ERROR, "Drop frame is only allowed with multiples of 30000/1001 FPS\n");
180 ✗ return AVERROR(EINVAL);
181 }
182
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 182 if (check_fps(tc->fps) < 0) {
183 ✗ av_log(log_ctx, AV_LOG_WARNING, "Using non-standard frame rate %d/%d\n",
184 tc->rate.num, tc->rate.den);
185 }
186 182 return 0;
187 }
188
189 182 static int fps_from_frame_rate(AVRational rate)
190 {
191
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 182 if (!rate.den || !rate.num)
192 ✗ return -1;
193 182 return (rate.num + rate.den/2LL) / rate.den;
194 }
195
196 ✗ int av_timecode_check_frame_rate(AVRational rate)
197 {
198 ✗ return check_fps(fps_from_frame_rate(rate));
199 }
200
201 154 int av_timecode_init(AVTimecode *tc, AVRational rate, int flags, int frame_start, void *log_ctx)
202 {
203 154 memset(tc, 0, sizeof(*tc));
204 154 tc->start = frame_start;
205 154 tc->flags = flags;
206 154 tc->rate = rate;
207 154 tc->fps = fps_from_frame_rate(rate);
208 154 return check_timecode(log_ctx, tc);
209 }
210
211 28 int av_timecode_init_from_components(AVTimecode *tc, AVRational rate, int flags, int hh, int mm, int ss, int ff, void *log_ctx)
212 {
213 int ret;
214
215 28 memset(tc, 0, sizeof(*tc));
216 28 tc->flags = flags;
217 28 tc->rate = rate;
218 28 tc->fps = fps_from_frame_rate(rate);
219
220 28 ret = check_timecode(log_ctx, tc);
221
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 28 if (ret < 0)
222 ✗ return ret;
223
224 28 tc->start = (hh*3600 + mm*60 + ss) * tc->fps + ff;
225
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 28 if (tc->flags & AV_TIMECODE_FLAG_DROPFRAME) { /* adjust frame number */
226 13 int tmins = 60*hh + mm;
227 13 tc->start -= (tc->fps / 30 * 2) * (tmins - tmins/10);
228 }
229 28 return 0;
230 }
231
232 28 int av_timecode_init_from_string(AVTimecode *tc, AVRational rate, const char *str, void *log_ctx)
233 {
234 char c;
235 int hh, mm, ss, ff, flags;
236
237
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 28 if (sscanf(str, "%d:%d:%d%c%d", &hh, &mm, &ss, &c, &ff) != 5) {
238 ✗ av_log(log_ctx, AV_LOG_ERROR, "Unable to parse timecode, "
239 "syntax: hh:mm:ss[:;.]ff\n");
240 ✗ return AVERROR_INVALIDDATA;
241 }
242 28 flags = c != ':' ? AV_TIMECODE_FLAG_DROPFRAME : 0; // drop if ';', '.', ...
243
244 28 return av_timecode_init_from_components(tc, rate, flags, hh, mm, ss, ff, log_ctx);
245 }
246