mirror of
https://git.ffmpeg.org/ffmpeg.git
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216 lines
6.9 KiB
C
216 lines
6.9 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) 2011-2012 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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* @see https://en.wikipedia.org/wiki/SMPTE_time_code
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* @see http://www.dropframetimecode.org
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*/
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#include <stdio.h>
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#include "timecode.h"
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#include "log.h"
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#include "error.h"
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#ifdef FF_API_OLD_TC_ADJUST_FRAMENUM
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int av_timecode_adjust_ntsc_framenum(int framenum)
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{
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/* only works for NTSC 29.97 */
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int d = framenum / 17982;
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int m = framenum % 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 framenum + 18 * d + 2 * ((m - 2) / 1798);
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}
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#endif
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int av_timecode_adjust_ntsc_framenum2(int framenum, int fps)
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{
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/* only works for NTSC 29.97 and 59.94 */
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int drop_frames = 0;
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int d = framenum / 17982;
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int m = framenum % 17982;
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if (fps == 30)
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drop_frames = 2;
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else if (fps == 60)
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drop_frames = 4;
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else
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return framenum;
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//if (m < 2) m += 2; /* not needed since -2,-1 / 1798 in C returns 0 */
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return framenum + 9 * drop_frames * d + drop_frames * ((m - 2) / 1798);
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}
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uint32_t av_timecode_get_smpte_from_framenum(const AVTimecode *tc, int framenum)
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{
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unsigned fps = tc->fps;
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int drop = !!(tc->flags & AV_TIMECODE_FLAG_DROPFRAME);
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int hh, mm, ss, ff;
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framenum += tc->start;
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if (drop)
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framenum = av_timecode_adjust_ntsc_framenum2(framenum, tc->fps);
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ff = framenum % fps;
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ss = framenum / fps % 60;
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mm = framenum / (fps*60) % 60;
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hh = framenum / (fps*3600) % 24;
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return 0 << 31 | // color frame flag (0: unsync mode, 1: sync mode)
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drop << 30 | // drop frame flag (0: non drop, 1: drop)
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(ff / 10) << 28 | // tens of frames
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(ff % 10) << 24 | // units of frames
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0 << 23 | // PC (NTSC) or BGF0 (PAL)
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(ss / 10) << 20 | // tens of seconds
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(ss % 10) << 16 | // units of seconds
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0 << 15 | // BGF0 (NTSC) or BGF2 (PAL)
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(mm / 10) << 12 | // tens of minutes
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(mm % 10) << 8 | // units of minutes
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0 << 7 | // BGF2 (NTSC) or PC (PAL)
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0 << 6 | // BGF1
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(hh / 10) << 4 | // tens of hours
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(hh % 10); // units of hours
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}
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char *av_timecode_make_string(const AVTimecode *tc, char *buf, int framenum)
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{
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int fps = tc->fps;
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int drop = tc->flags & AV_TIMECODE_FLAG_DROPFRAME;
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int hh, mm, ss, ff, neg = 0;
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framenum += tc->start;
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if (drop)
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framenum = av_timecode_adjust_ntsc_framenum2(framenum, fps);
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if (framenum < 0) {
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framenum = -framenum;
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neg = tc->flags & AV_TIMECODE_FLAG_ALLOWNEGATIVE;
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}
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ff = framenum % fps;
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ss = framenum / fps % 60;
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mm = framenum / (fps*60) % 60;
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hh = framenum / (fps*3600);
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if (tc->flags & AV_TIMECODE_FLAG_24HOURSMAX)
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hh = hh % 24;
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snprintf(buf, AV_TIMECODE_STR_SIZE, "%s%02d:%02d:%02d%c%02d",
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neg ? "-" : "",
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hh, mm, ss, drop ? ';' : ':', ff);
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return buf;
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}
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static unsigned bcd2uint(uint8_t bcd)
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{
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unsigned low = bcd & 0xf;
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unsigned high = bcd >> 4;
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if (low > 9 || high > 9)
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return 0;
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return low + 10*high;
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}
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char *av_timecode_make_smpte_tc_string(char *buf, uint32_t tcsmpte, int prevent_df)
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{
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unsigned hh = bcd2uint(tcsmpte & 0x3f); // 6-bit hours
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unsigned mm = bcd2uint(tcsmpte>>8 & 0x7f); // 7-bit minutes
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unsigned ss = bcd2uint(tcsmpte>>16 & 0x7f); // 7-bit seconds
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unsigned ff = bcd2uint(tcsmpte>>24 & 0x3f); // 6-bit frames
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unsigned drop = tcsmpte & 1<<30 && !prevent_df; // 1-bit drop if not arbitrary bit
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snprintf(buf, AV_TIMECODE_STR_SIZE, "%02u:%02u:%02u%c%02u",
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hh, mm, ss, drop ? ';' : ':', ff);
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return buf;
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}
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char *av_timecode_make_mpeg_tc_string(char *buf, uint32_t tc25bit)
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{
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snprintf(buf, AV_TIMECODE_STR_SIZE, "%02u:%02u:%02u%c%02u",
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tc25bit>>19 & 0x1f, // 5-bit hours
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tc25bit>>13 & 0x3f, // 6-bit minutes
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tc25bit>>6 & 0x3f, // 6-bit seconds
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tc25bit & 1<<24 ? ';' : ':', // 1-bit drop flag
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tc25bit & 0x3f); // 6-bit frames
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return buf;
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}
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static int check_timecode(void *log_ctx, AVTimecode *tc)
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{
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if (tc->fps <= 0) {
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av_log(log_ctx, AV_LOG_ERROR, "Timecode frame rate must be specified\n");
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return AVERROR(EINVAL);
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}
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if ((tc->flags & AV_TIMECODE_FLAG_DROPFRAME) && tc->fps != 30) {
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av_log(log_ctx, AV_LOG_ERROR, "Drop frame is only allowed with 30000/1001 FPS\n");
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return AVERROR(EINVAL);
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}
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switch (tc->fps) {
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case 24:
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case 25:
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case 30:
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case 50:
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case 60: return 0;
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default:
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av_log(log_ctx, AV_LOG_ERROR, "Timecode frame rate not supported\n");
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return AVERROR_PATCHWELCOME;
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}
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}
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static int fps_from_frame_rate(AVRational rate)
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{
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if (!rate.den || !rate.num)
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return -1;
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return (rate.num + rate.den/2) / rate.den;
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}
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int av_timecode_init(AVTimecode *tc, AVRational rate, int flags, int frame_start, void *log_ctx)
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{
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memset(tc, 0, sizeof(*tc));
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tc->start = frame_start;
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tc->flags = flags;
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tc->rate = rate;
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tc->fps = fps_from_frame_rate(rate);
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return check_timecode(log_ctx, tc);
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}
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int av_timecode_init_from_string(AVTimecode *tc, AVRational rate, const char *str, void *log_ctx)
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{
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char c;
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int hh, mm, ss, ff, ret;
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if (sscanf(str, "%d:%d:%d%c%d", &hh, &mm, &ss, &c, &ff) != 5) {
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av_log(log_ctx, AV_LOG_ERROR, "Unable to parse timecode, "
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"syntax: hh:mm:ss[:;.]ff\n");
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return AVERROR_INVALIDDATA;
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}
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memset(tc, 0, sizeof(*tc));
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tc->flags = c != ':' ? AV_TIMECODE_FLAG_DROPFRAME : 0; // drop if ';', '.', ...
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tc->rate = rate;
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tc->fps = fps_from_frame_rate(rate);
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ret = check_timecode(log_ctx, tc);
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if (ret < 0)
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return ret;
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tc->start = (hh*3600 + mm*60 + ss) * tc->fps + ff;
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if (tc->flags & AV_TIMECODE_FLAG_DROPFRAME) { /* 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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