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65 lines
2.1 KiB
65 lines
2.1 KiB
/* |
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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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