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avfilter/f_metadata: allow direct flushing when printing to file 

Useful for monitoring sparse data in realtime
This commit is contained in:
Gyan Doshi 2020-01-07 17:30:34 +05:30
parent c4c96d5942
commit 22a06a539d
2 changed files with 9 additions and 0 deletions
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3
doc/filters.texi
View File

@ -22731,6 +22731,9 @@ plain filename any writable url can be specified. Filename ``-'' is a shorthand
for standard output. If @code{file} option is not set, output is written to the log
with AV_LOG_INFO loglevel.
@item direct
Reduces buffering in print mode when output is written to a URL set using @var{file}.
@end table
@subsection Examples

6
libavfilter/f_metadata.c
View File

@ -88,6 +88,8 @@ typedef struct MetadataContext {
int (*compare)(struct MetadataContext *s,
const char *value1, const char *value2);
void (*print)(AVFilterContext *ctx, const char *msg, ...) av_printf_format(2, 3);
int direct; // reduces buffering when printing to user-supplied URL
} MetadataContext;
#define OFFSET(x) offsetof(MetadataContext, x)
@ -111,6 +113,7 @@ static const AVOption filt_name##_options[] = { \
{ "ends_with", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_ENDS_WITH }, 0, 0, FLAGS, "function" }, \
{ "expr", "set expression for expr function", OFFSET(expr_str), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, FLAGS }, \
{ "file", "set file where to print metadata information", OFFSET(file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS }, \
{ "direct", "reduce buffering when printing to user-set file or pipe", OFFSET(direct), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS }, \
{ NULL } \
}
@ -274,6 +277,9 @@ static av_cold int init(AVFilterContext *ctx)
s->file_str, buf);
return ret;
}
if (s->direct)
s->avio_context->direct = AVIO_FLAG_DIRECT;
}
return 0;