tunnel-sink-new: Fix stale audio on resume

I noticed that when resuming the tunnel sink, there was a small amount
of previously played audio before the new audio started to play.
Normally that probably wouldn't be noticeable, because there would be
a few seconds of silence played before suspending the sink due to
inactivity, so the unwanted old audio would be just silence, but in my
configuration sinks are suspended immediately when there's nothing
playing to them, so the glitch becomes audible.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/modules/module-tunnel-sink-new.c b/src/modules/module-tunnel-sink-new.c
index 7d3bd9989..1b3858d32 100644
--- a/src/modules/module-tunnel-sink-new.c
+++ b/src/modules/module-tunnel-sink-new.c
@@ -109,6 +109,15 @@ static void cork_stream(struct userdata *u, bool cork) {
     pa_assert(u);
     pa_assert(u->stream);
 
+    if (cork) {
+        /* When the sink becomes suspended (which is the only case where we
+         * cork the stream), we don't want to keep any old data around, because
+         * the old data is most likely unrelated to the audio that will be
+         * played at the time when the sink starts running again. */
+        if ((operation = pa_stream_flush(u->stream, NULL, NULL)))
+            pa_operation_unref(operation);
+    }
+
     if ((operation = pa_stream_cork(u->stream, cork, NULL, NULL)))
         pa_operation_unref(operation);
 }