avfilter/formats: Add function to create AVFilterFormats with one entry

Most instances ff_add_formats() actually only ever add one format;
this function can be used to simplify those callers.

Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/libavfilter/formats.c b/libavfilter/formats.c
index ec3b8ebd8d..d667188381 100644
--- a/libavfilter/formats.c
+++ b/libavfilter/formats.c
@@ -431,6 +431,12 @@ int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
     return 0;
 }
 
+AVFilterFormats *ff_make_formats_list_singleton(int fmt)
+{
+    int fmts[2] = { fmt, -1 };
+    return ff_make_format_list(fmts);
+}
+
 AVFilterFormats *ff_all_formats(enum AVMediaType type)
 {
     AVFilterFormats *ret = NULL;