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, 11 insertions, 0 deletions

diff --git a/src/output_thread.c b/src/output_thread.c
index eb44d4c8..0e34c64b 100644
--- a/src/output_thread.c
+++ b/src/output_thread.c
@@ -26,6 +26,7 @@
 #include "player_control.h"
 #include "filter_plugin.h"
 #include "filter/convert_filter_plugin.h"
+#include "filter/replay_gain_filter_plugin.h"
 
 #include <glib.h>
 
@@ -261,6 +262,16 @@ ao_play_chunk(struct audio_output *ao, const struct music_chunk *chunk)
 		g_mutex_lock(ao->mutex);
 	}
 
+	/* update replay gain */
+
+	if (chunk->replay_gain_serial != ao->replay_gain_serial) {
+		replay_gain_filter_set_info(ao->replay_gain_filter,
+					    chunk->replay_gain_serial != 0
+					    ? &chunk->replay_gain_info
+					    : NULL);
+		ao->replay_gain_serial = chunk->replay_gain_serial;
+	}
+
 	if (size == 0)
 		return true;