[FFmpeg-cvslog] avutil/timecode: add ff_timecode_set_smpte
Timo Rothenpieler
git at videolan.org
Sun Mar 2 19:55:36 EET 2025
ffmpeg | branch: master | Timo Rothenpieler <timo at rothenpieler.org> | Sun Feb 23 00:53:09 2025 +0100| [9d5d51bd129cfb7cdb085aa4b474711d4a777735] | committer: Timo Rothenpieler
avutil/timecode: add ff_timecode_set_smpte
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=9d5d51bd129cfb7cdb085aa4b474711d4a777735
---
libavutil/Makefile | 1 +
libavutil/timecode.c | 27 +++--------------------
libavutil/timecode_internal.c | 51 +++++++++++++++++++++++++++++++++++++++++++
libavutil/timecode_internal.h | 51 +++++++++++++++++++++++++++++++++++++++++++
4 files changed, 106 insertions(+), 24 deletions(-)
diff --git a/libavutil/Makefile b/libavutil/Makefile
index b2b3b9c156..aea10ba635 100644
--- a/libavutil/Makefile
+++ b/libavutil/Makefile
@@ -180,6 +180,7 @@ OBJS = adler32.o \
threadmessage.o \
time.o \
timecode.o \
+ timecode_internal.o \
timestamp.o \
tree.o \
twofish.o \
diff --git a/libavutil/timecode.c b/libavutil/timecode.c
index f454466f97..bca16b6ac2 100644
--- a/libavutil/timecode.c
+++ b/libavutil/timecode.c
@@ -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);
diff --git a/libavutil/timecode_internal.c b/libavutil/timecode_internal.c
new file mode 100644
index 0000000000..259ebf1664
--- /dev/null
+++ b/libavutil/timecode_internal.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2006 Smartjog S.A.S, Baptiste Coudurier <baptiste.coudurier at gmail.com>
+ * Copyright (c) 2011-2012 Smartjog S.A.S, Clément Bœsch <clement.boesch at 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);
+ }
+ }
+}
diff --git a/libavutil/timecode_internal.h b/libavutil/timecode_internal.h
new file mode 100644
index 0000000000..8ef43d1f98
--- /dev/null
+++ b/libavutil/timecode_internal.h
@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2006 Smartjog S.A.S, Baptiste Coudurier <baptiste.coudurier at gmail.com>
+ * Copyright (c) 2011-2012 Smartjog S.A.S, Clément Bœsch <clement.boesch at 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 */
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