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avfilter/vf_drawtext: add optional default value to metadata function

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Signed-off-by: Tobias Rapp <t.rapp@noa-archive.com>
This commit is contained in:
Tobias Rapp 2016-04-07 10:20:53 +02:00 committed by Paul B Mahol
parent 3674a53d17
commit ee104580c5
3 changed files with 10 additions and 3 deletions
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7
doc/filters.texi
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@ -6682,7 +6682,12 @@ The time at which the filter is running, expressed in the local time zone.
It can accept an argument: a strftime() format string.
@item metadata
Frame metadata. It must take one argument specifying metadata key.
Frame metadata. Takes one or two arguments.
The first argument is mandatory and specifies the metadata key.
The second argument is optional and specifies a default value, used when the
metadata key is not found or empty.
@item n, frame_num
The frame number, starting from 0.

2
libavfilter/version.h
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@ -31,7 +31,7 @@
#define LIBAVFILTER_VERSION_MAJOR 6
#define LIBAVFILTER_VERSION_MINOR 41
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_MICRO 101
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \

4
libavfilter/vf_drawtext.c
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@ -860,6 +860,8 @@ static int func_metadata(AVFilterContext *ctx, AVBPrint *bp,
if (e && e->value)
av_bprintf(bp, "%s", e->value);
else if (argc >= 2)
av_bprintf(bp, "%s", argv[1]);
return 0;
}
@ -975,7 +977,7 @@ static const struct drawtext_function {
{ "localtime", 0, 1, 'L', func_strftime },
{ "frame_num", 0, 0, 0, func_frame_num },
{ "n", 0, 0, 0, func_frame_num },
{ "metadata", 1, 1, 0, func_metadata },
{ "metadata", 1, 2, 0, func_metadata },
};
static int eval_function(AVFilterContext *ctx, AVBPrint *bp, char *fct,