mirror of
https://github.com/FFmpeg/FFmpeg.git
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124 lines
4.3 KiB
C
124 lines
4.3 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 Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser 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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uint32_t ff_framenum_to_smtpe_timecode(unsigned frame, int fps, int drop)
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{
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return (0 << 31) | // color frame flag
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(drop << 30) | // drop frame flag
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( ((frame % fps) / 10) << 28) | // tens of frames
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( ((frame % fps) % 10) << 24) | // units of frames
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(0 << 23) | // field phase (NTSC), b0 (PAL)
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((((frame / fps) % 60) / 10) << 20) | // tens of seconds
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((((frame / fps) % 60) % 10) << 16) | // units of seconds
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(0 << 15) | // b0 (NTSC), b2 (PAL)
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((((frame / (fps * 60)) % 60) / 10) << 12) | // tens of minutes
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((((frame / (fps * 60)) % 60) % 10) << 8) | // units of minutes
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(0 << 7) | // b1
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(0 << 6) | // b2 (NTSC), field phase (PAL)
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((((frame / (fps * 3600) % 24)) / 10) << 4) | // tens of hours
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( (frame / (fps * 3600) % 24)) % 10; // units of hours
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}
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static int check_timecode_rate(void *avcl, AVRational rate, int drop)
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{
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int fps;
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if (!rate.num || !rate.den) {
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av_log(avcl, AV_LOG_ERROR, "Timecode frame rate must be specified\n");
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return -1;
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}
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fps = (rate.num + rate.den/2) / rate.den;
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if (drop && (rate.den != 1001 || fps != 30)) {
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av_log(avcl, AV_LOG_ERROR, "Drop frame is only allowed with 30000/1001 FPS\n");
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return -2;
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}
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switch (fps) {
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case 24:
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case 25:
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case 30: return 0;
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default:
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av_log(avcl, AV_LOG_ERROR, "Timecode frame rate not supported\n");
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return -3;
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}
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}
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char *avpriv_timecode_to_string(char *buf, const struct ff_timecode *tc, unsigned frame)
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{
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int frame_num = tc->start + frame;
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int fps = (tc->rate.num + tc->rate.den/2) / tc->rate.den;
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int ff = frame_num % fps;
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int ss = frame_num / fps % 60;
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int mm = frame_num / (fps*60) % 60;
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int hh = frame_num / (fps*3600) % 24;
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if (tc->drop)
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frame_num = ff_framenum_to_drop_timecode(frame_num);
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snprintf(buf, sizeof("hh:mm:ss.ff"), "%02d:%02d:%02d%c%02d",
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hh, mm, ss, tc->drop ? ';' : ':', ff);
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return buf;
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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, ret;
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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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tc->drop = c != ':'; // drop if ';', '.', ...
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ret = check_timecode_rate(avcl, tc->rate, tc->drop);
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if (ret < 0)
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return ret;
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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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if (tc->drop) { /* adjust frame number */
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int tmins = 60*hh + mm;
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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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