avfilter: Deduplicate default video inputs/outputs

Lots of video filters use a very simple input or output:
An array with a single AVFilterPad whose name is "default"
and whose type is AVMEDIA_TYPE_VIDEO; everything else is unset.

Given that we never use pointer equality for inputs or outputs*,
we can simply use a single AVFilterPad instead of dozens; this
even saves .data.rel.ro (8312B here) as well as relocations.

*: In fact, several filters (like the filters in vf_lut.c)
already use the same outputs; furthermore, ff_filter_alloc()
duplicates the input and output pads so that we do not even
work with the pads directly.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

1 files changed, 1 insertions, 8 deletions

diff --git a/libavfilter/vf_tpad.c b/libavfilter/vf_tpad.c
index 19c4f9b0b5..7990403e81 100644
--- a/libavfilter/vf_tpad.c
+++ b/libavfilter/vf_tpad.c
@@ -225,13 +225,6 @@ static const AVFilterPad tpad_inputs[] = {
     },
 };
 
-static const AVFilterPad tpad_outputs[] = {
-    {
-        .name = "default",
-        .type = AVMEDIA_TYPE_VIDEO,
-    },
-};
-
 const AVFilter ff_vf_tpad = {
     .name          = "tpad",
     .description   = NULL_IF_CONFIG_SMALL("Temporarily pad video frames."),
@@ -240,6 +233,6 @@ const AVFilter ff_vf_tpad = {
     .activate      = activate,
     .uninit        = uninit,
     FILTER_INPUTS(tpad_inputs),
-    FILTER_OUTPUTS(tpad_outputs),
+    FILTER_OUTPUTS(ff_video_default_filterpad),
     FILTER_QUERY_FUNC(query_formats),
 };