FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavutil/timecode.c
Date: 2024-11-20 23:03:26
Exec Total Coverage
Lines: 119 138 86.2%
Functions: 13 15 86.7%
Branches: 50 70 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 "log.h"
33 #include "error.h"
34
35 3536 int av_timecode_adjust_ntsc_framenum2(int framenum, int fps)
36 {
37 /* only works for multiples of NTSC 29.97 */
38 3536 int drop_frames = 0;
39 int d, m, frames_per_10mins;
40
41
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 3536 if (fps && fps % 30 == 0) {
42 3536 drop_frames = fps / 30 * 2;
43 3536 frames_per_10mins = fps / 30 * 17982;
44 } else
45 ✗ return framenum;
46
47 3536 d = framenum / frames_per_10mins;
48 3536 m = framenum % frames_per_10mins;
49
50 3536 return framenum + 9U * drop_frames * d + drop_frames * ((m - drop_frames) / (frames_per_10mins / 10));
51 }
52
53 270142 uint32_t av_timecode_get_smpte_from_framenum(const AVTimecode *tc, int framenum)
54 {
55 270142 unsigned fps = tc->fps;
56 270142 int drop = !!(tc->flags & AV_TIMECODE_FLAG_DROPFRAME);
57 int hh, mm, ss, ff;
58
59 270142 framenum += tc->start;
60
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 270142 if (drop)
61 3515 framenum = av_timecode_adjust_ntsc_framenum2(framenum, tc->fps);
62 270142 ff = framenum % fps;
63 270142 ss = framenum / fps % 60;
64 270142 mm = framenum / (fps*60) % 60;
65 270142 hh = framenum / (fps*3600) % 24;
66 270142 return av_timecode_get_smpte(tc->rate, drop, hh, mm, ss, ff);
67 }
68
69 271118 uint32_t av_timecode_get_smpte(AVRational rate, int drop, int hh, int mm, int ss, int ff)
70 {
71 271118 uint32_t tc = 0;
72
73 /* For SMPTE 12-M timecodes, frame count is a special case if > 30 FPS.
74 See SMPTE ST 12-1:2014 Sec 12.1 for more info. */
75
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 271118 if (av_cmp_q(rate, (AVRational) {30, 1}) == 1) {
76
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 57628 if (ff % 2 == 1) {
77
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 28802 if (av_cmp_q(rate, (AVRational) {50, 1}) == 0)
78 28800 tc |= (1 << 7);
79 else
80 2 tc |= (1 << 23);
81 }
82 57628 ff /= 2;
83 }
84
85 271118 hh = hh % 24;
86 271118 mm = av_clip(mm, 0, 59);
87 271118 ss = av_clip(ss, 0, 59);
88 271118 ff = ff % 40;
89
90 271118 tc |= drop << 30;
91 271118 tc |= (ff / 10) << 28;
92 271118 tc |= (ff % 10) << 24;
93 271118 tc |= (ss / 10) << 20;
94 271118 tc |= (ss % 10) << 16;
95 271118 tc |= (mm / 10) << 12;
96 271118 tc |= (mm % 10) << 8;
97 271118 tc |= (hh / 10) << 4;
98 271118 tc |= (hh % 10);
99
100 271118 return tc;
101 }
102
103 126 char *av_timecode_make_string(const AVTimecode *tc, char *buf, int framenum_arg)
104 {
105 126 int fps = tc->fps;
106 126 int drop = tc->flags & AV_TIMECODE_FLAG_DROPFRAME;
107 126 int hh, mm, ss, ff, ff_len, neg = 0;
108 126 int64_t framenum = framenum_arg;
109
110 126 framenum += tc->start;
111
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 126 if (drop)
112 12 framenum = av_timecode_adjust_ntsc_framenum2(framenum, fps);
113
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 126 if (framenum < 0) {
114 ✗ framenum = -framenum;
115 ✗ neg = tc->flags & AV_TIMECODE_FLAG_ALLOWNEGATIVE;
116 }
117 126 ff = framenum % fps;
118 126 ss = framenum / fps % 60;
119 126 mm = framenum / (fps*60LL) % 60;
120 126 hh = framenum / (fps*3600LL);
121
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 126 if (tc->flags & AV_TIMECODE_FLAG_24HOURSMAX)
122 1 hh = hh % 24;
123
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 126 ff_len = fps > 10000 ? 5 : fps > 1000 ? 4 : fps > 100 ? 3 : fps > 10 ? 2 : 1;
124
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 126 snprintf(buf, AV_TIMECODE_STR_SIZE, "%s%02d:%02d:%02d%c%0*d",
125 neg ? "-" : "",
126 hh, mm, ss, drop ? ';' : ':', ff_len, ff);
127 126 return buf;
128 }
129
130 4104 static unsigned bcd2uint(uint8_t bcd)
131 {
132 4104 unsigned low = bcd & 0xf;
133 4104 unsigned high = bcd >> 4;
134
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 4104 if (low > 9 || high > 9)
135 ✗ return 0;
136 4104 return low + 10*high;
137 }
138
139 1026 char *av_timecode_make_smpte_tc_string2(char *buf, AVRational rate, uint32_t tcsmpte, int prevent_df, int skip_field)
140 {
141 1026 unsigned hh = bcd2uint(tcsmpte & 0x3f); // 6-bit hours
142 1026 unsigned mm = bcd2uint(tcsmpte>>8 & 0x7f); // 7-bit minutes
143 1026 unsigned ss = bcd2uint(tcsmpte>>16 & 0x7f); // 7-bit seconds
144 1026 unsigned ff = bcd2uint(tcsmpte>>24 & 0x3f); // 6-bit frames
145
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 1026 unsigned drop = tcsmpte & 1<<30 && !prevent_df; // 1-bit drop if not arbitrary bit
146
147
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 1026 if (av_cmp_q(rate, (AVRational) {30, 1}) == 1) {
148 47 ff <<= 1;
149
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 47 if (!skip_field) {
150
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 43 if (av_cmp_q(rate, (AVRational) {50, 1}) == 0)
151 43 ff += !!(tcsmpte & 1 << 7);
152 else
153 ✗ ff += !!(tcsmpte & 1 << 23);
154 }
155 }
156
157
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 1026 snprintf(buf, AV_TIMECODE_STR_SIZE, "%02u:%02u:%02u%c%02u",
158 hh, mm, ss, drop ? ';' : ':', ff);
159 1026 return buf;
160
161 }
162
163 ✗ char *av_timecode_make_smpte_tc_string(char *buf, uint32_t tcsmpte, int prevent_df)
164 {
165 ✗ return av_timecode_make_smpte_tc_string2(buf, (AVRational){30, 1}, tcsmpte, prevent_df, 1);
166 }
167
168 377 char *av_timecode_make_mpeg_tc_string(char *buf, uint32_t tc25bit)
169 {
170 377 snprintf(buf, AV_TIMECODE_STR_SIZE,
171 "%02"PRIu32":%02"PRIu32":%02"PRIu32"%c%02"PRIu32,
172 377 tc25bit>>19 & 0x1f, // 5-bit hours
173 377 tc25bit>>13 & 0x3f, // 6-bit minutes
174 377 tc25bit>>6 & 0x3f, // 6-bit seconds
175
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 377 tc25bit & 1<<24 ? ';' : ':', // 1-bit drop flag
176 tc25bit & 0x3f); // 6-bit frames
177 377 return buf;
178 }
179
180 182 static int check_fps(int fps)
181 {
182 int i;
183 static const int supported_fps[] = {
184 24, 25, 30, 48, 50, 60, 100, 120, 150,
185 };
186
187
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 422 for (i = 0; i < FF_ARRAY_ELEMS(supported_fps); i++)
188
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 422 if (fps == supported_fps[i])
189 182 return 0;
190 ✗ return -1;
191 }
192
193 182 static int check_timecode(void *log_ctx, AVTimecode *tc)
194 {
195
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 182 if ((int)tc->fps <= 0) {
196 ✗ av_log(log_ctx, AV_LOG_ERROR, "Valid timecode frame rate must be specified. Minimum value is 1\n");
197 ✗ return AVERROR(EINVAL);
198 }
199
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 182 if ((tc->flags & AV_TIMECODE_FLAG_DROPFRAME) && tc->fps % 30 != 0) {
200 ✗ av_log(log_ctx, AV_LOG_ERROR, "Drop frame is only allowed with multiples of 30000/1001 FPS\n");
201 ✗ return AVERROR(EINVAL);
202 }
203
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 182 if (check_fps(tc->fps) < 0) {
204 ✗ av_log(log_ctx, AV_LOG_WARNING, "Using non-standard frame rate %d/%d\n",
205 tc->rate.num, tc->rate.den);
206 }
207 182 return 0;
208 }
209
210 182 static int fps_from_frame_rate(AVRational rate)
211 {
212
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 182 if (!rate.den || !rate.num)
213 ✗ return -1;
214 182 return (rate.num + rate.den/2LL) / rate.den;
215 }
216
217 ✗ int av_timecode_check_frame_rate(AVRational rate)
218 {
219 ✗ return check_fps(fps_from_frame_rate(rate));
220 }
221
222 154 int av_timecode_init(AVTimecode *tc, AVRational rate, int flags, int frame_start, void *log_ctx)
223 {
224 154 memset(tc, 0, sizeof(*tc));
225 154 tc->start = frame_start;
226 154 tc->flags = flags;
227 154 tc->rate = rate;
228 154 tc->fps = fps_from_frame_rate(rate);
229 154 return check_timecode(log_ctx, tc);
230 }
231
232 28 int av_timecode_init_from_components(AVTimecode *tc, AVRational rate, int flags, int hh, int mm, int ss, int ff, void *log_ctx)
233 {
234 int ret;
235
236 28 memset(tc, 0, sizeof(*tc));
237 28 tc->flags = flags;
238 28 tc->rate = rate;
239 28 tc->fps = fps_from_frame_rate(rate);
240
241 28 ret = check_timecode(log_ctx, tc);
242
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 28 if (ret < 0)
243 ✗ return ret;
244
245 28 tc->start = (hh*3600 + mm*60 + ss) * tc->fps + ff;
246
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 28 if (tc->flags & AV_TIMECODE_FLAG_DROPFRAME) { /* adjust frame number */
247 13 int tmins = 60*hh + mm;
248 13 tc->start -= (tc->fps / 30 * 2) * (tmins - tmins/10);
249 }
250 28 return 0;
251 }
252
253 28 int av_timecode_init_from_string(AVTimecode *tc, AVRational rate, const char *str, void *log_ctx)
254 {
255 char c;
256 int hh, mm, ss, ff, flags;
257
258
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 28 if (sscanf(str, "%d:%d:%d%c%d", &hh, &mm, &ss, &c, &ff) != 5) {
259 ✗ av_log(log_ctx, AV_LOG_ERROR, "Unable to parse timecode, "
260 "syntax: hh:mm:ss[:;.]ff\n");
261 ✗ return AVERROR_INVALIDDATA;
262 }
263 28 flags = c != ':' ? AV_TIMECODE_FLAG_DROPFRAME : 0; // drop if ';', '.', ...
264
265 28 return av_timecode_init_from_components(tc, rate, flags, hh, mm, ss, ff, log_ctx);
266 }
267