avfilter/avfilter: Add avfilter_filter_pad_count()

It is intended as replacement for avfilter_pad_count(). In contrast to
the latter, it avoids a loop.

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

1 files changed, 5 insertions, 0 deletions

diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h
index 5025fafdc5..3a0f0b7926 100644
--- a/libavfilter/avfilter.h
+++ b/libavfilter/avfilter.h
@@ -326,6 +326,11 @@ typedef struct AVFilter {
 } AVFilter;
 
 /**
+ * Get the number of elements in an AVFilter's inputs or outputs array.
+ */
+unsigned avfilter_filter_pad_count(const AVFilter *filter, int is_output);
+
+/**
  * Process multiple parts of the frame concurrently.
  */
 #define AVFILTER_THREAD_SLICE (1 << 0)