| /* |
| * Copyright (c) 2006 Smartjog S.A.S, Baptiste Coudurier <baptiste.coudurier@gmail.com> |
| * Copyright (c) 2011-2012 Smartjog S.A.S, Clément Bœsch <clement.boesch@smartjog.com> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * Timecode helpers |
| * @see https://en.wikipedia.org/wiki/SMPTE_time_code |
| * @see http://www.dropframetimecode.org |
| */ |
| |
| #include <stdio.h> |
| #include "timecode.h" |
| #include "log.h" |
| #include "error.h" |
| |
| int av_timecode_adjust_ntsc_framenum2(int framenum, int fps) |
| { |
| /* only works for NTSC 29.97 and 59.94 */ |
| int drop_frames = 0; |
| int d, m, frames_per_10mins; |
| |
| if (fps == 30) { |
| drop_frames = 2; |
| frames_per_10mins = 17982; |
| } else if (fps == 60) { |
| drop_frames = 4; |
| frames_per_10mins = 35964; |
| } else |
| return framenum; |
| |
| d = framenum / frames_per_10mins; |
| m = framenum % frames_per_10mins; |
| |
| return framenum + 9 * drop_frames * d + drop_frames * ((m - drop_frames) / (frames_per_10mins / 10)); |
| } |
| |
| uint32_t av_timecode_get_smpte_from_framenum(const AVTimecode *tc, int framenum) |
| { |
| unsigned fps = tc->fps; |
| int drop = !!(tc->flags & AV_TIMECODE_FLAG_DROPFRAME); |
| int hh, mm, ss, ff; |
| |
| framenum += tc->start; |
| if (drop) |
| framenum = av_timecode_adjust_ntsc_framenum2(framenum, tc->fps); |
| ff = framenum % fps; |
| ss = framenum / fps % 60; |
| mm = framenum / (fps*60) % 60; |
| hh = framenum / (fps*3600) % 24; |
| return 0 << 31 | // color frame flag (0: unsync mode, 1: sync mode) |
| drop << 30 | // drop frame flag (0: non drop, 1: drop) |
| (ff / 10) << 28 | // tens of frames |
| (ff % 10) << 24 | // units of frames |
| 0 << 23 | // PC (NTSC) or BGF0 (PAL) |
| (ss / 10) << 20 | // tens of seconds |
| (ss % 10) << 16 | // units of seconds |
| 0 << 15 | // BGF0 (NTSC) or BGF2 (PAL) |
| (mm / 10) << 12 | // tens of minutes |
| (mm % 10) << 8 | // units of minutes |
| 0 << 7 | // BGF2 (NTSC) or PC (PAL) |
| 0 << 6 | // BGF1 |
| (hh / 10) << 4 | // tens of hours |
| (hh % 10); // units of hours |
| } |
| |
| char *av_timecode_make_string(const AVTimecode *tc, char *buf, int framenum) |
| { |
| int fps = tc->fps; |
| int drop = tc->flags & AV_TIMECODE_FLAG_DROPFRAME; |
| int hh, mm, ss, ff, neg = 0; |
| |
| framenum += tc->start; |
| if (drop) |
| framenum = av_timecode_adjust_ntsc_framenum2(framenum, fps); |
| if (framenum < 0) { |
| framenum = -framenum; |
| neg = tc->flags & AV_TIMECODE_FLAG_ALLOWNEGATIVE; |
| } |
| ff = framenum % fps; |
| ss = framenum / fps % 60; |
| mm = framenum / (fps*60) % 60; |
| hh = framenum / (fps*3600); |
| if (tc->flags & AV_TIMECODE_FLAG_24HOURSMAX) |
| hh = hh % 24; |
| snprintf(buf, AV_TIMECODE_STR_SIZE, "%s%02d:%02d:%02d%c%02d", |
| neg ? "-" : "", |
| hh, mm, ss, drop ? ';' : ':', ff); |
| return buf; |
| } |
| |
| static unsigned bcd2uint(uint8_t bcd) |
| { |
| unsigned low = bcd & 0xf; |
| unsigned high = bcd >> 4; |
| if (low > 9 || high > 9) |
| return 0; |
| return low + 10*high; |
| } |
| |
| char *av_timecode_make_smpte_tc_string(char *buf, uint32_t tcsmpte, int prevent_df) |
| { |
| unsigned hh = bcd2uint(tcsmpte & 0x3f); // 6-bit hours |
| unsigned mm = bcd2uint(tcsmpte>>8 & 0x7f); // 7-bit minutes |
| unsigned ss = bcd2uint(tcsmpte>>16 & 0x7f); // 7-bit seconds |
| unsigned ff = bcd2uint(tcsmpte>>24 & 0x3f); // 6-bit frames |
| unsigned drop = tcsmpte & 1<<30 && !prevent_df; // 1-bit drop if not arbitrary bit |
| snprintf(buf, AV_TIMECODE_STR_SIZE, "%02u:%02u:%02u%c%02u", |
| hh, mm, ss, drop ? ';' : ':', ff); |
| return buf; |
| } |
| |
| char *av_timecode_make_mpeg_tc_string(char *buf, uint32_t tc25bit) |
| { |
| snprintf(buf, AV_TIMECODE_STR_SIZE, "%02u:%02u:%02u%c%02u", |
| tc25bit>>19 & 0x1f, // 5-bit hours |
| tc25bit>>13 & 0x3f, // 6-bit minutes |
| tc25bit>>6 & 0x3f, // 6-bit seconds |
| tc25bit & 1<<24 ? ';' : ':', // 1-bit drop flag |
| tc25bit & 0x3f); // 6-bit frames |
| return buf; |
| } |
| |
| static int check_fps(int fps) |
| { |
| int i; |
| static const int supported_fps[] = { |
| 24, 25, 30, 48, 50, 60, 100, 120, 150, |
| }; |
| |
| for (i = 0; i < FF_ARRAY_ELEMS(supported_fps); i++) |
| if (fps == supported_fps[i]) |
| return 0; |
| return -1; |
| } |
| |
| static int check_timecode(void *log_ctx, AVTimecode *tc) |
| { |
| if ((int)tc->fps <= 0) { |
| av_log(log_ctx, AV_LOG_ERROR, "Timecode frame rate must be specified\n"); |
| return AVERROR(EINVAL); |
| } |
| if ((tc->flags & AV_TIMECODE_FLAG_DROPFRAME) && tc->fps != 30 && tc->fps != 60) { |
| av_log(log_ctx, AV_LOG_ERROR, "Drop frame is only allowed with 30000/1001 or 60000/1001 FPS\n"); |
| return AVERROR(EINVAL); |
| } |
| if (check_fps(tc->fps) < 0) { |
| av_log(log_ctx, AV_LOG_WARNING, "Using non-standard frame rate %d/%d\n", |
| tc->rate.num, tc->rate.den); |
| } |
| return 0; |
| } |
| |
| static int fps_from_frame_rate(AVRational rate) |
| { |
| if (!rate.den || !rate.num) |
| return -1; |
| return (rate.num + rate.den/2) / rate.den; |
| } |
| |
| int av_timecode_check_frame_rate(AVRational rate) |
| { |
| return check_fps(fps_from_frame_rate(rate)); |
| } |
| |
| int av_timecode_init(AVTimecode *tc, AVRational rate, int flags, int frame_start, void *log_ctx) |
| { |
| memset(tc, 0, sizeof(*tc)); |
| tc->start = frame_start; |
| tc->flags = flags; |
| tc->rate = rate; |
| tc->fps = fps_from_frame_rate(rate); |
| return check_timecode(log_ctx, tc); |
| } |
| |
| int av_timecode_init_from_string(AVTimecode *tc, AVRational rate, const char *str, void *log_ctx) |
| { |
| char c; |
| int hh, mm, ss, ff, ret; |
| |
| if (sscanf(str, "%d:%d:%d%c%d", &hh, &mm, &ss, &c, &ff) != 5) { |
| av_log(log_ctx, AV_LOG_ERROR, "Unable to parse timecode, " |
| "syntax: hh:mm:ss[:;.]ff\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| memset(tc, 0, sizeof(*tc)); |
| tc->flags = c != ':' ? AV_TIMECODE_FLAG_DROPFRAME : 0; // drop if ';', '.', ... |
| tc->rate = rate; |
| tc->fps = fps_from_frame_rate(rate); |
| |
| ret = check_timecode(log_ctx, tc); |
| if (ret < 0) |
| return ret; |
| |
| tc->start = (hh*3600 + mm*60 + ss) * tc->fps + ff; |
| if (tc->flags & AV_TIMECODE_FLAG_DROPFRAME) { /* adjust frame number */ |
| int tmins = 60*hh + mm; |
| tc->start -= 2 * (tmins - tmins/10); |
| } |
| return 0; |
| } |
