66 lines
2.1 KiB
C
66 lines
2.1 KiB
C
/*
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* Copyright (C) 2006 Smartjog S.A.S, Baptiste Coudurier <baptiste.coudurier@gmail.com>
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* Copyright (C) 2011 Smartjog S.A.S, Clément Bœsch <clement.boesch@smartjog.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License as published by the Free Software Foundation;
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* version 2 of the License.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Timecode helpers
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*/
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#include <stdio.h>
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#include "timecode.h"
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#include "libavutil/log.h"
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int ff_framenum_to_drop_timecode(int frame_num)
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{
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/* only works for NTSC 29.97 */
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int d = frame_num / 17982;
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int m = frame_num % 17982;
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//if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
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return frame_num + 18 * d + 2 * ((m - 2) / 1798);
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}
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int ff_init_smtpe_timecode(void *avcl, struct ff_timecode *tc)
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{
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int hh, mm, ss, ff, fps;
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char c;
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if (sscanf(tc->str, "%d:%d:%d%c%d", &hh, &mm, &ss, &c, &ff) != 5) {
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av_log(avcl, AV_LOG_ERROR, "unable to parse timecode, "
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"syntax: hh:mm:ss[:;.]ff\n");
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return -1;
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}
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fps = (tc->rate.num + tc->rate.den/2) / tc->rate.den;
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tc->start = (hh*3600 + mm*60 + ss) * fps + ff;
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tc->drop = c != ':'; // drop if ';', '.', ...
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if (tc->drop) { /* adjust frame number */
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int tmins = 60*hh + mm;
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if (tc->rate.den != 1001 || fps != 30) {
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av_log(avcl, AV_LOG_ERROR, "error: drop frame is only allowed with"
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"30000/1001 FPS");
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return -2;
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}
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tc->start -= 2 * (tmins - tmins/10);
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}
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return 0;
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}
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