audio: drop buffered filter data when seeking

This could lead to (barely) audible artifacts with --af=scaletempo and
modified playback speed.

1 files changed, 7 insertions, 0 deletions

diff --git a/audio/filter/af.c b/audio/filter/af.c
index 6f0241ec2b..2cc6389841 100644
--- a/audio/filter/af.c
+++ b/audio/filter/af.c
@@ -746,3 +746,10 @@ struct af_instance *af_control_any_rev(struct af_stream *s, int cmd, void *arg)
     }
     return NULL;
 }
+
+/* Send control to all filters. Never stop, even if a filter returns AF_OK. */
+void af_control_all(struct af_stream *s, int cmd, void *arg)
+{
+    for (struct af_instance *af = s->first; af; af = af->next)
+        af->control(af, cmd, arg);
+}