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avutil/timecode: add av_timecode_make_smpte_tc_string2

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Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint
2020-07-24 15:09:32 +02:00
parent 5357401671
commit 837b6eb90e
4 changed files with 39 additions and 2 deletions
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19
libavutil/timecode.c
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@@ -136,16 +136,33 @@ static unsigned bcd2uint(uint8_t bcd)
return low + 10*high;
}
char *av_timecode_make_smpte_tc_string(char *buf, uint32_t tcsmpte, int prevent_df)
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);
}
}
snprintf(buf, AV_TIMECODE_STR_SIZE, "%02u:%02u:%02u%c%02u",
hh, mm, ss, drop ? ';' : ':', ff);
return buf;
}
char *av_timecode_make_smpte_tc_string(char *buf, uint32_t tcsmpte, int prevent_df)
{
return av_timecode_make_smpte_tc_string2(buf, (AVRational){30, 1}, tcsmpte, prevent_df, 1);
}
char *av_timecode_make_mpeg_tc_string(char *buf, uint32_t tc25bit)