replay_gain: reimplement as a filter plugin

Apply the replay gain in the output thread.  This means a new setting
will be active instantly, without going through the whole music pipe.
And we might have different replay gain settings for each audio output
device.

1 files changed, 6 insertions, 0 deletions

diff --git a/test/run_output.c b/test/run_output.c
index 774ce99f9..6e0fffbd0 100644
--- a/test/run_output.c
+++ b/test/run_output.c
@@ -26,6 +26,7 @@
 #include "filter_registry.h"
 #include "pcm_convert.h"
 #include "event_pipe.h"
+#include "idle.h"
 
 #include <glib.h>
 
@@ -34,6 +35,11 @@
 #include <unistd.h>
 
 void
+idle_add(G_GNUC_UNUSED unsigned flags)
+{
+}
+
+void
 event_pipe_emit(G_GNUC_UNUSED enum pipe_event event)
 {
 }