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avutil/timecode: add ff_timecode_set_smpte

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This commit is contained in:
Timo Rothenpieler
2025-02-23 00:53:09 +01:00
parent 600ad36949
commit 9d5d51bd12
4 changed files with 106 additions and 24 deletions
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1
libavutil/Makefile
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@ -180,6 +180,7 @@ OBJS = adler32.o \
threadmessage.o \
time.o \
timecode.o \
timecode_internal.o \
timestamp.o \
tree.o \
twofish.o \

27
libavutil/timecode.c
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@ -29,6 +29,7 @@
#include <stdio.h>
#include "common.h"
#include "timecode.h"
#include "timecode_internal.h"
#include "log.h"
#include "error.h"
@ -127,32 +128,10 @@ char *av_timecode_make_string(const AVTimecode *tc, char *buf, int framenum_arg)
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_string2(char *buf, AVRational rate, uint32_t tcsmpte, int prevent_df, int skip_field)
{
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
if (av_cmp_q(rate, (AVRational) {30, 1}) == 1) {
ff <<= 1;
if (!skip_field) {
if (av_cmp_q(rate, (AVRational) {50, 1}) == 0)
ff += !!(tcsmpte & 1 << 7);
else
ff += !!(tcsmpte & 1 << 23);
}
}
unsigned hh, mm, ss, ff, drop;
ff_timecode_set_smpte(&drop, &hh, &mm, &ss, &ff, rate, tcsmpte, prevent_df, skip_field);
snprintf(buf, AV_TIMECODE_STR_SIZE, "%02u:%02u:%02u%c%02u",
hh, mm, ss, drop ? ';' : ':', ff);

51
libavutil/timecode_internal.c Normal file
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@ -0,0 +1,51 @@
/*
* 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
*/
#include "timecode_internal.h"
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;
}
void ff_timecode_set_smpte(unsigned *drop, unsigned *hh, unsigned *mm, unsigned *ss, unsigned *ff,
AVRational rate, uint32_t tcsmpte, int prevent_df, int skip_field)
{
*hh = bcd2uint(tcsmpte & 0x3f); // 6-bit hours
*mm = bcd2uint(tcsmpte>>8 & 0x7f); // 7-bit minutes
*ss = bcd2uint(tcsmpte>>16 & 0x7f); // 7-bit seconds
*ff = bcd2uint(tcsmpte>>24 & 0x3f); // 6-bit frames
*drop = tcsmpte & 1<<30 && !prevent_df; // 1-bit drop if not arbitrary bit
if (av_cmp_q(rate, (AVRational) {30, 1}) == 1) {
*ff <<= 1;
if (!skip_field) {
if (av_cmp_q(rate, (AVRational) {50, 1}) == 0)
*ff += !!(tcsmpte & 1 << 7);
else
*ff += !!(tcsmpte & 1 << 23);
}
}
}

51
libavutil/timecode_internal.h Normal file
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@ -0,0 +1,51 @@
/*
* 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 header
*/
#ifndef AVUTIL_TIMECODE_INTERNAL_H
#define AVUTIL_TIMECODE_INTERNAL_H
#include <stdint.h>
#include "rational.h"
/**
* Convert SMPTE 12M binary representation to sei info.
*
* @param drop drop flag output
* @param hh hour output
* @param mm minute output
* @param ss second output
* @param ff frame number output
* @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)
*/
void ff_timecode_set_smpte(unsigned *drop, unsigned *hh, unsigned *mm, unsigned *ss, unsigned *ff,
AVRational rate, uint32_t tcsmpte, int prevent_df, int skip_field);
#endif /* AVUTIL_TIMECODE_INTERNAL_H */