> On Jun 15, 2021, at 3:14 AM, Thilo Borgmann <thilo.borgm...@mail.de> wrote:
>
> Am 08.06.21 um 18:42 schrieb Thilo Borgmann:
>> Hi,
>>
>> add %{localtime_ms} function to the drawtext filter. Same as %{localtime}
>> but with additional millisecond part.
>
> Ping for a volunteer to actually have a look at the patch for review.
>
> Thanks,
> Thilo
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>
> diff --git a/libavfilter/vf_drawtext.c b/libavfilter/vf_drawtext.c
> index 382d589e26..684f954236 100644
> --- a/libavfilter/vf_drawtext.c
> +++ b/libavfilter/vf_drawtext.c
> @@ -53,6 +53,7 @@
> #include "libavutil/parseutils.h"
> #include "libavutil/timecode.h"
> #include "libavutil/time_internal.h"
> +#include "libavutil/time.h"
> #include "libavutil/tree.h"
> #include "libavutil/lfg.h"
> #include "libavutil/detection_bbox.h"
> @@ -1049,11 +1050,27 @@ static int func_strftime(AVFilterContext *ctx,
> AVBPrint *bp,
> struct tm tm;
>
> time(&now);
> - if (tag == 'L')
> + if (tag == 'L' || tag == 'M')
> localtime_r(&now, &tm);
> else
> tm = *gmtime_r(&now, &tm);
> av_bprint_strftime(bp, fmt, &tm);
> +
> + if (tag == 'M') {
> + char ms[5] = {0};
> + // get time returns time since epoch in micro seconds, localtime_r
> would
> + // already take care of representing seconds part, so we need to get
> + // milliseconds, to do that we round up microseconds to seconds
> + // then convert seconds back to microseconds - this will drop
> microsecond
> + // precision, then compute difference between av_gettime result and
> + // rounded up sec -> usec representation and convert that to
> milliseconds
> + int64_t usecs = av_gettime();
There is no guarantee that when av_gettime() is called, it’s in the same second
as ’time(&now)’
was called. For example:
time(&now) was called at 10.999999 second, and return 10.
av_gettime() was called at 11.001 second
It will show 10.001, which should be 11.001.
> + int64_t secs = usecs / 1000000;
> + int64_t msec_delta = (usecs - secs * 1000000) / 1000;
> + snprintf(ms, 5, ".%03d", (int)msec_delta);
> + av_bprint_append_data(bp, ms, 4);
> + }
> +
> return 0;
> }
>
> @@ -1153,6 +1170,7 @@ static const struct drawtext_function {
> { "pts", 0, 3, 0, func_pts },
> { "gmtime", 0, 1, 'G', func_strftime },
> { "localtime", 0, 1, 'L', func_strftime },
> + { "localtime_ms", 0, 1, 'M', func_strftime },
Then why not add a gmtime_ms?
> { "frame_num", 0, 0, 0, func_frame_num },
> { "n", 0, 0, 0, func_frame_num },
> { "metadata", 1, 2, 0, func_metadata },
> --
> 2.20.1 (Apple Git-117)
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