/* * Copyright (c) 2006 Smartjog S.A.S, Baptiste Coudurier <[email protected]> * Copyright (c) 2011-2012 Smartjog S.A.S, Clément Bœsch <[email protected]> * * 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 AVUTIL_TIMECODE_H #define AVUTIL_TIMECODE_H #include <stdint.h> #include "rational.h" #define AV_TIMECODE_STR_SIZE … enum AVTimecodeFlag { … }; AVTimecode; /** * Adjust frame number for NTSC drop frame time code. * * @param framenum frame number to adjust * @param fps frame per second, multiples of 30 * @return adjusted frame number * @warning adjustment is only valid for multiples of NTSC 29.97 */ int av_timecode_adjust_ntsc_framenum2(int framenum, int fps); /** * Convert frame number to SMPTE 12M binary representation. * * @param tc timecode data correctly initialized * @param framenum frame number * @return the SMPTE binary representation * * See SMPTE ST 314M-2005 Sec 4.4.2.2.1 "Time code pack (TC)" * the format description as follows: * bits 0-5: hours, in BCD(6bits) * bits 6: BGF1 * bits 7: BGF2 (NTSC) or FIELD (PAL) * bits 8-14: minutes, in BCD(7bits) * bits 15: BGF0 (NTSC) or BGF2 (PAL) * bits 16-22: seconds, in BCD(7bits) * bits 23: FIELD (NTSC) or BGF0 (PAL) * bits 24-29: frames, in BCD(6bits) * bits 30: drop frame flag (0: non drop, 1: drop) * bits 31: color frame flag (0: unsync mode, 1: sync mode) * @note BCD numbers (6 or 7 bits): 4 or 5 lower bits for units, 2 higher bits for tens. * @note Frame number adjustment is automatically done in case of drop timecode, * you do NOT have to call av_timecode_adjust_ntsc_framenum2(). * @note The frame number is relative to tc->start. * @note Color frame (CF) and binary group flags (BGF) bits are set to zero. */ uint32_t av_timecode_get_smpte_from_framenum(const AVTimecode *tc, int framenum); /** * Convert sei info to SMPTE 12M binary representation. * * @param rate frame rate in rational form * @param drop drop flag * @param hh hour * @param mm minute * @param ss second * @param ff frame number * @return the SMPTE binary representation */ uint32_t av_timecode_get_smpte(AVRational rate, int drop, int hh, int mm, int ss, int ff); /** * Load timecode string in buf. * * @param tc timecode data correctly initialized * @param buf destination buffer, must be at least AV_TIMECODE_STR_SIZE long * @param framenum frame number * @return the buf parameter * * @note Timecode representation can be a negative timecode and have more than * 24 hours, but will only be honored if the flags are correctly set. * @note The frame number is relative to tc->start. */ char *av_timecode_make_string(const AVTimecode *tc, char *buf, int framenum); /** * Get the timecode string from the SMPTE timecode format. * * In contrast to av_timecode_make_smpte_tc_string this function supports 50/60 * fps timecodes by using the field bit. * * @param buf destination buffer, must be at least AV_TIMECODE_STR_SIZE long * @param rate frame rate of the timecode * @param tcsmpte the 32-bit SMPTE timecode * @param prevent_df prevent the use of a drop flag when it is known the DF bit * is arbitrary * @param skip_field prevent the use of a field flag when it is known the field * bit is arbitrary (e.g. because it is used as PC flag) * @return the buf parameter */ char *av_timecode_make_smpte_tc_string2(char *buf, AVRational rate, uint32_t tcsmpte, int prevent_df, int skip_field); /** * Get the timecode string from the SMPTE timecode format. * * @param buf destination buffer, must be at least AV_TIMECODE_STR_SIZE long * @param tcsmpte the 32-bit SMPTE timecode * @param prevent_df prevent the use of a drop flag when it is known the DF bit * is arbitrary * @return the buf parameter */ char *av_timecode_make_smpte_tc_string(char *buf, uint32_t tcsmpte, int prevent_df); /** * Get the timecode string from the 25-bit timecode format (MPEG GOP format). * * @param buf destination buffer, must be at least AV_TIMECODE_STR_SIZE long * @param tc25bit the 25-bits timecode * @return the buf parameter */ char *av_timecode_make_mpeg_tc_string(char *buf, uint32_t tc25bit); /** * Init a timecode struct with the passed parameters. * * @param tc pointer to an allocated AVTimecode * @param rate frame rate in rational form * @param flags miscellaneous flags such as drop frame, +24 hours, ... * (see AVTimecodeFlag) * @param frame_start the first frame number * @param log_ctx a pointer to an arbitrary struct of which the first field * is a pointer to an AVClass struct (used for av_log) * @return 0 on success, AVERROR otherwise */ int av_timecode_init(AVTimecode *tc, AVRational rate, int flags, int frame_start, void *log_ctx); /** * Init a timecode struct from the passed timecode components. * * @param tc pointer to an allocated AVTimecode * @param rate frame rate in rational form * @param flags miscellaneous flags such as drop frame, +24 hours, ... * (see AVTimecodeFlag) * @param hh hours * @param mm minutes * @param ss seconds * @param ff frames * @param log_ctx a pointer to an arbitrary struct of which the first field * is a pointer to an AVClass struct (used for av_log) * @return 0 on success, AVERROR otherwise */ int av_timecode_init_from_components(AVTimecode *tc, AVRational rate, int flags, int hh, int mm, int ss, int ff, void *log_ctx); /** * Parse timecode representation (hh:mm:ss[:;.]ff). * * @param tc pointer to an allocated AVTimecode * @param rate frame rate in rational form * @param str timecode string which will determine the frame start * @param log_ctx a pointer to an arbitrary struct of which the first field is a * pointer to an AVClass struct (used for av_log). * @return 0 on success, AVERROR otherwise */ int av_timecode_init_from_string(AVTimecode *tc, AVRational rate, const char *str, void *log_ctx); /** * Check if the timecode feature is available for the given frame rate * * @return 0 if supported, <0 otherwise */ int av_timecode_check_frame_rate(AVRational rate); #endif /* AVUTIL_TIMECODE_H */
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