From 79723c2a878b13110ce3e86db68c33f4f71f6da7 Mon Sep 17 00:00:00 2001 From: Limin Wang Date: Wed, 24 Jun 2020 13:59:34 +0800 Subject: [PATCH] avutil/timecode: add function av_timecode_get_smpte() Signed-off-by: Limin Wang --- libavutil/timecode.c | 32 ++++++++++++++++++++++++++++++++ libavutil/timecode.h | 13 +++++++++++++ 2 files changed, 45 insertions(+) diff --git a/libavutil/timecode.c b/libavutil/timecode.c index 60077ba0c04..cca53d73c43 100644 --- a/libavutil/timecode.c +++ b/libavutil/timecode.c @@ -81,6 +81,38 @@ uint32_t av_timecode_get_smpte_from_framenum(const AVTimecode *tc, int framenum) (hh % 10); // units of hours } +uint32_t av_timecode_get_smpte(AVRational rate, int drop, int hh, int mm, int ss, int ff) +{ + uint32_t tc = 0; + uint32_t frames; + + /* For SMPTE 12-M timecodes, frame count is a special case if > 30 FPS. + See SMPTE ST 12-1:2014 Sec 12.1 for more info. */ + if (av_cmp_q(rate, (AVRational) {30, 1}) == 1) { + frames = ff / 2; + if (ff % 2 == 1) { + if (av_cmp_q(rate, (AVRational) {50, 1}) == 0) + tc |= (1 << 7); + else + tc |= (1 << 23); + } + } else { + frames = ff; + } + + tc |= drop << 30; + tc |= (frames / 10) << 28; + tc |= (frames % 10) << 24; + tc |= (ss / 10) << 20; + tc |= (ss % 10) << 16; + tc |= (mm / 10) << 12; + tc |= (mm % 10) << 8; + tc |= (hh / 10) << 4; + tc |= (hh % 10); + + return tc; +} + char *av_timecode_make_string(const AVTimecode *tc, char *buf, int framenum) { int fps = tc->fps; diff --git a/libavutil/timecode.h b/libavutil/timecode.h index 37c1361bc28..ab38e661f13 100644 --- a/libavutil/timecode.h +++ b/libavutil/timecode.h @@ -70,6 +70,19 @@ int av_timecode_adjust_ntsc_framenum2(int framenum, int fps); */ 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. * -- 2.39.2