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 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.
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.
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
25 * This *private* API is deprecated, please use the one available in libavutil instead.
30 #if FF_API_OLD_TIMECODE
34 #include "libavutil/log.h"
36 int avpriv_framenum_to_drop_timecode(int frame_num)
38 /* only works for NTSC 29.97 */
39 int d = frame_num / 17982;
40 int m = frame_num % 17982;
41 //if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
42 return frame_num + 18 * d + 2 * ((m - 2) / 1798);
45 uint32_t avpriv_framenum_to_smpte_timecode(unsigned frame, int fps, int drop)
47 return (0 << 31) | // color frame flag
48 (drop << 30) | // drop frame flag
49 ( ((frame % fps) / 10) << 28) | // tens of frames
50 ( ((frame % fps) % 10) << 24) | // units of frames
51 (0 << 23) | // field phase (NTSC), b0 (PAL)
52 ((((frame / fps) % 60) / 10) << 20) | // tens of seconds
53 ((((frame / fps) % 60) % 10) << 16) | // units of seconds
54 (0 << 15) | // b0 (NTSC), b2 (PAL)
55 ((((frame / (fps * 60)) % 60) / 10) << 12) | // tens of minutes
56 ((((frame / (fps * 60)) % 60) % 10) << 8) | // units of minutes
58 (0 << 6) | // b2 (NTSC), field phase (PAL)
59 ((((frame / (fps * 3600) % 24)) / 10) << 4) | // tens of hours
60 ( (frame / (fps * 3600) % 24)) % 10; // units of hours
63 int avpriv_check_timecode_rate(void *avcl, AVRational rate, int drop)
67 if (!rate.num || !rate.den) {
68 av_log(avcl, AV_LOG_ERROR, "Timecode frame rate must be specified\n");
71 fps = (rate.num + rate.den/2) / rate.den;
72 if (drop && fps != 30) {
73 av_log(avcl, AV_LOG_ERROR, "Drop frame is only allowed with 30000/1001 FPS\n");
82 av_log(avcl, AV_LOG_ERROR, "Timecode frame rate not supported\n");
87 char *avpriv_timecode_to_string(char *buf, const struct ff_timecode *tc, unsigned frame)
89 int frame_num = tc->start + frame;
90 int fps = (tc->rate.num + tc->rate.den/2) / tc->rate.den;
91 int hh, mm, ss, ff, neg = 0;
94 frame_num = avpriv_framenum_to_drop_timecode(frame_num);
96 frame_num = -frame_num;
100 ss = frame_num / fps % 60;
101 mm = frame_num / (fps*60) % 60;
102 hh = frame_num / (fps*3600);
103 snprintf(buf, 16, "%s%02d:%02d:%02d%c%02d",
105 hh, mm, ss, tc->drop ? ';' : ':', ff);
109 int avpriv_init_smpte_timecode(void *avcl, struct ff_timecode *tc)
111 int hh, mm, ss, ff, fps, ret;
114 if (sscanf(tc->str, "%d:%d:%d%c%d", &hh, &mm, &ss, &c, &ff) != 5) {
115 av_log(avcl, AV_LOG_ERROR, "unable to parse timecode, "
116 "syntax: hh:mm:ss[:;.]ff\n");
120 tc->drop = c != ':'; // drop if ';', '.', ...
122 ret = avpriv_check_timecode_rate(avcl, tc->rate, tc->drop);
126 fps = (tc->rate.num + tc->rate.den/2) / tc->rate.den;
127 tc->start = (hh*3600 + mm*60 + ss) * fps + ff;
129 if (tc->drop) { /* adjust frame number */
130 int tmins = 60*hh + mm;
131 tc->start -= 2 * (tmins - tmins/10);
136 int ff_framenum_to_drop_timecode(int frame_num)
138 return avpriv_framenum_to_drop_timecode(frame_num);
141 uint32_t ff_framenum_to_smtpe_timecode(unsigned frame, int fps, int drop)
143 return avpriv_framenum_to_smpte_timecode(frame, fps, drop);
146 int ff_init_smtpe_timecode(void *avcl, struct ff_timecode *tc)
148 return avpriv_init_smpte_timecode(avcl, tc);