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