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215 lines
6.9 KiB
215 lines
6.9 KiB
/* |
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* Copyright (c) 2006 Smartjog S.A.S, Baptiste Coudurier <baptiste.coudurier@gmail.com> |
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* Copyright (c) 2011-2012 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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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_fps(int fps) |
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{ |
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int i; |
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static const int supported_fps[] = {24, 25, 30, 50, 60}; |
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for (i = 0; i < FF_ARRAY_ELEMS(supported_fps); i++) |
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if (fps == supported_fps[i]) |
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return 0; |
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return -1; |
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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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if (check_fps(tc->fps) < 0) { |
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av_log(log_ctx, AV_LOG_ERROR, "Timecode frame rate %d/%d not supported\n", |
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tc->rate.num, tc->rate.den); |
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return AVERROR_PATCHWELCOME; |
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} |
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return 0; |
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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_check_frame_rate(AVRational rate) |
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{ |
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return check_fps(fps_from_frame_rate(rate)); |
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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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