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avfilter/drawtext: allow to format pts with strftime 

Signed-off-by: Alex Agranovsky <alex@sighthound.com>
This commit is contained in:
Alex Agranovsky 2015-10-10 14:52:34 -04:00 committed by Nicolas George
parent 1f3a29e999
commit cf28490e56
2 changed files with 18 additions and 2 deletions
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8
doc/filters.texi
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@ -5398,14 +5398,20 @@ A 1 character description of the current picture type.
@item pts
The timestamp of the current frame.
It can take up to two arguments.
It can take up to three arguments.
The first argument is the format of the timestamp; it defaults to @code{flt}
for seconds as a decimal number with microsecond accuracy; @code{hms} stands
for a formatted @var{[-]HH:MM:SS.mmm} timestamp with millisecond accuracy.
@code{gmtime} stands for the timestamp of the frame formatted as UTC time;
@code{localtime} stands for the timestamp of the frame formatted as
local time zone time.
The second argument is an offset added to the timestamp.
If the format is set to @code{localtime} or @code{gmtime},
a third argument may be supplied: a strftime() format string.
By default, @var{YYYY-MM-DD HH:MM:SS} format will be used.
@end table
@subsection Examples

12
libavfilter/vf_drawtext.c
View File

@ -824,6 +824,16 @@ static int func_pts(AVFilterContext *ctx, AVBPrint *bp,
(int)(ms / 1000) % 60,
(int)ms % 1000);
}
} else if (!strcmp(fmt, "localtime") ||
!strcmp(fmt, "gmtime")) {
struct tm tm;
time_t ms = (time_t)pts;
const char *timefmt = argc >= 3 ? argv[2] : "%Y-%m-%d %H:%M:%S";
if (!strcmp(fmt, "localtime"))
localtime_r(&ms, &tm);
else
gmtime_r(&ms, &tm);
av_bprint_strftime(bp, timefmt, &tm);
} else {
av_log(ctx, AV_LOG_ERROR, "Invalid format '%s'\n", fmt);
return AVERROR(EINVAL);
@ -958,7 +968,7 @@ static const struct drawtext_function {
{ "expr_int_format", 2, 3, 0, func_eval_expr_int_format },
{ "eif", 2, 3, 0, func_eval_expr_int_format },
{ "pict_type", 0, 0, 0, func_pict_type },
{ "pts", 0, 2, 0, func_pts },
{ "pts", 0, 3, 0, func_pts },
{ "gmtime", 0, 1, 'G', func_strftime },
{ "localtime", 0, 1, 'L', func_strftime },
{ "frame_num", 0, 0, 0, func_frame_num },