filters: add another dumb helper

Can be used with mp_chain_filters() to combine multiple filters into a
single one. This is a bit silly, but whatever. I'm making it an explicit
separate filter, because it lets the user access mp_filter.ppins against
all conventions.

1 files changed, 16 insertions, 0 deletions

diff --git a/filters/f_utils.c b/filters/f_utils.c
index 826f527a0b..1b5b0e548e 100644
--- a/filters/f_utils.c
+++ b/filters/f_utils.c
@@ -178,6 +178,22 @@ struct mp_filter *mp_bidir_nop_filter_create(struct mp_filter *parent)
     return f;
 }
 
+static const struct mp_filter_info bidir_dummy_filter = {
+    .name = "dummy",
+};
+
+struct mp_filter *mp_bidir_dummy_filter_create(struct mp_filter *parent)
+{
+    struct mp_filter *f = mp_filter_create(parent, &bidir_dummy_filter);
+    if (!f)
+        return NULL;
+
+    mp_filter_add_pin(f, MP_PIN_IN, "in");
+    mp_filter_add_pin(f, MP_PIN_OUT, "out");
+
+    return f;
+}
+
 struct fixed_aframe_size_priv {
     int samples;
     bool pad_silence;