2 * Copyright (C) 2006 Smartjog S.A.S, Baptiste Coudurier <baptiste.coudurier@gmail.com>
3 * Copyright (C) 2011 Smartjog S.A.S, Clément Bœsch <clement.boesch@smartjog.com>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public
9 * License as published by the Free Software Foundation;
10 * version 2 of the License.
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 * General Public License for more details.
17 * You should have received a copy of the GNU 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
29 #include "libavutil/log.h"
31 int ff_framenum_to_drop_timecode(int frame_num)
33 /* only works for NTSC 29.97 */
34 int d = frame_num / 17982;
35 int m = frame_num % 17982;
36 //if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
37 return frame_num + 18 * d + 2 * ((m - 2) / 1798);
40 uint32_t ff_framenum_to_smtpe_timecode(unsigned frame, int fps, int drop)
42 return (0 << 31) | // color frame flag
43 (drop << 30) | // drop frame flag
44 ( ((frame % fps) / 10) << 28) | // tens of frames
45 ( ((frame % fps) % 10) << 24) | // units of frames
46 (0 << 23) | // field phase (NTSC), b0 (PAL)
47 ((((frame / fps) % 60) / 10) << 20) | // tens of seconds
48 ((((frame / fps) % 60) % 10) << 16) | // units of seconds
49 (0 << 15) | // b0 (NTSC), b2 (PAL)
50 ((((frame / (fps * 60)) % 60) / 10) << 12) | // tens of minutes
51 ((((frame / (fps * 60)) % 60) % 10) << 8) | // units of minutes
53 (0 << 6) | // b2 (NTSC), field phase (PAL)
54 ((((frame / (fps * 3600) % 24)) / 10) << 4) | // tens of hours
55 ( (frame / (fps * 3600) % 24)) % 10; // units of hours
58 int ff_init_smtpe_timecode(void *avcl, struct ff_timecode *tc)
60 int hh, mm, ss, ff, fps;
63 if (sscanf(tc->str, "%d:%d:%d%c%d", &hh, &mm, &ss, &c, &ff) != 5) {
64 av_log(avcl, AV_LOG_ERROR, "unable to parse timecode, "
65 "syntax: hh:mm:ss[:;.]ff\n");
69 fps = (tc->rate.num + tc->rate.den/2) / tc->rate.den;
70 tc->start = (hh*3600 + mm*60 + ss) * fps + ff;
71 tc->drop = c != ':'; // drop if ';', '.', ...
73 if (tc->drop) { /* adjust frame number */
74 int tmins = 60*hh + mm;
75 if (tc->rate.den != 1001 || fps != 30) {
76 av_log(avcl, AV_LOG_ERROR, "error: drop frame is only allowed with"
80 tc->start -= 2 * (tmins - tmins/10);