/* * Copyright (C) 2006 Smartjog S.A.S, Baptiste Coudurier <baptiste.coudurier@gmail.com> * Copyright (C) 2011 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 header */ #ifndef AVCODEC_TIMECODE_H #define AVCODEC_TIMECODE_H #include <stdint.h> #include "libavutil/rational.h" #define TIMECODE_OPT(ctx, flags) \ "timecode", "set timecode value following hh:mm:ss[:;.]ff format, " \ "use ';' or '.' before frame number for drop frame", \ offsetof(ctx, tc.str), \ AV_OPT_TYPE_STRING, {.str=NULL}, CHAR_MIN, CHAR_MAX, flags struct ff_timecode { char *str; ///< string following the hh:mm:ss[:;.]ff format int start; ///< timecode frame start int drop; ///< drop flag (1 if drop, else 0) AVRational rate; ///< Frame rate in rationnal form }; /** * @brief Adjust frame number for NTSC drop frame time code * @param frame_num Actual frame number to adjust * @return Adjusted frame number * @warning Adjustment is only valid in NTSC 29.97 */ int ff_framenum_to_drop_timecode(int frame_num); /** * @brief Convert frame id (timecode) to SMPTE 12M binary representation * @param frame Frame number * @param fps Frame rate * @param drop Drop flag * @return The actual binary representation */ uint32_t ff_framenum_to_smtpe_timecode(unsigned frame, int fps, int drop); /** * Parse SMTPE 12M time representation (hh:mm:ss[:;.]ff). str and rate fields * from tc struct must be set. * * @param avcl A pointer to an arbitrary struct of which the first field is a * pointer to an AVClass struct (used for av_log). * @param tc Timecode struct pointer * @return 0 on success, negative value on failure * @warning Adjustement is only valid in NTSC 29.97 */ int ff_init_smtpe_timecode(void *avcl, struct ff_timecode *tc); #endif /* AVCODEC_TIMECODE_H */