avfilter: Deduplicate default audio inputs/outputs

Lots of audio filters use very simple inputs or outputs:
An array with a single AVFilterPad whose name is "default"
and whose type is AVMEDIA_TYPE_AUDIO; 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 (4784B here) as well as relocations.

*: In fact, several filters (like the filters in af_biquads.c)
already use the same inputs; 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/af_virtualbass.c b/libavfilter/af_virtualbass.c
index 76b3f42030..fb7189d364 100644
--- a/libavfilter/af_virtualbass.c
+++ b/libavfilter/af_virtualbass.c
@@ -163,20 +163,13 @@ static const AVFilterPad inputs[] = {
     },
 };
 
-static const AVFilterPad outputs[] = {
-    {
-        .name = "default",
-        .type = AVMEDIA_TYPE_AUDIO,
-    },
-};
-
 const AVFilter ff_af_virtualbass = {
     .name            = "virtualbass",
     .description     = NULL_IF_CONFIG_SMALL("Audio Virtual Bass."),
     .priv_size       = sizeof(AudioVirtualBassContext),
     .priv_class      = &virtualbass_class,
     FILTER_INPUTS(inputs),
-    FILTER_OUTPUTS(outputs),
+    FILTER_OUTPUTS(ff_audio_default_filterpad),
     FILTER_QUERY_FUNC(query_formats),
     .flags           = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
     .process_command = ff_filter_process_command,