7 files changed, 15 insertions, 8 deletions
diff --git a/src/mixer/alsa_mixer_plugin.c b/src/mixer/alsa_mixer_plugin.c
index 0f23bc03f..baf12030c 100644
--- a/src/mixer/alsa_mixer_plugin.c
+++ b/src/mixer/alsa_mixer_plugin.c
@@ -52,7 +52,7 @@ alsa_mixer_quark(void)
 }
 
 static struct mixer *
-alsa_mixer_init(const struct config_param *param,
+alsa_mixer_init(G_GNUC_UNUSED void *ao, const struct config_param *param,
 		G_GNUC_UNUSED GError **error_r)
 {
 	struct alsa_mixer *am = g_new(struct alsa_mixer, 1);
diff --git a/src/mixer/oss_mixer_plugin.c b/src/mixer/oss_mixer_plugin.c
index 3b97e38f5..4e169bbc4 100644
--- a/src/mixer/oss_mixer_plugin.c
+++ b/src/mixer/oss_mixer_plugin.c
@@ -74,7 +74,8 @@ oss_find_mixer(const char *name)
 }
 
 static struct mixer *
-oss_mixer_init(const struct config_param *param, GError **error_r)
+oss_mixer_init(G_GNUC_UNUSED void *ao, const struct config_param *param,
+	       GError **error_r)
 {
 	struct oss_mixer *om = g_new(struct oss_mixer, 1);
 
diff --git a/src/mixer/pulse_mixer_plugin.c b/src/mixer/pulse_mixer_plugin.c
index 3399d5baa..ecc0fc75b 100644
--- a/src/mixer/pulse_mixer_plugin.c
+++ b/src/mixer/pulse_mixer_plugin.c
@@ -212,7 +212,7 @@ context_state_cb(pa_context *context, void *userdata)
 
 
 static struct mixer *
-pulse_mixer_init(const struct config_param *param,
+pulse_mixer_init(G_GNUC_UNUSED void *ao, const struct config_param *param,
 		 G_GNUC_UNUSED GError **error_r)
 {
 	struct pulse_mixer *pm = g_new(struct pulse_mixer,1);
diff --git a/src/mixer/software_mixer_plugin.c b/src/mixer/software_mixer_plugin.c
index e81d265cb..2fcacd46d 100644
--- a/src/mixer/software_mixer_plugin.c
+++ b/src/mixer/software_mixer_plugin.c
@@ -37,7 +37,8 @@ struct software_mixer {
 };
 
 static struct mixer *
-software_mixer_init(G_GNUC_UNUSED const struct config_param *param,
+software_mixer_init(G_GNUC_UNUSED void *ao,
+		    G_GNUC_UNUSED const struct config_param *param,
 		    G_GNUC_UNUSED GError **error_r)
 {
 	struct software_mixer *sm = g_new(struct software_mixer, 1);
diff --git a/src/mixer_control.c b/src/mixer_control.c
index 7ee9fabf0..df1e43003 100644
--- a/src/mixer_control.c
+++ b/src/mixer_control.c
@@ -27,14 +27,15 @@
 #define G_LOG_DOMAIN "mixer"
 
 struct mixer *
-mixer_new(const struct mixer_plugin *plugin, const struct config_param *param,
+mixer_new(const struct mixer_plugin *plugin, void *ao,
+	  const struct config_param *param,
 	  GError **error_r)
 {
 	struct mixer *mixer;
 
 	assert(plugin != NULL);
 
-	mixer = plugin->init(param, error_r);
+	mixer = plugin->init(ao, param, error_r);
 
 	assert(mixer == NULL || mixer->plugin == plugin);
 
diff --git a/src/mixer_control.h b/src/mixer_control.h
index f023317e3..a550e0864 100644
--- a/src/mixer_control.h
+++ b/src/mixer_control.h
@@ -34,7 +34,8 @@ struct mixer_plugin;
 struct config_param;
 
 struct mixer *
-mixer_new(const struct mixer_plugin *plugin, const struct config_param *param,
+mixer_new(const struct mixer_plugin *plugin, void *ao,
+	  const struct config_param *param,
 	  GError **error_r);
 
 void
diff --git a/src/mixer_plugin.h b/src/mixer_plugin.h
index f3f70e2ef..648c3280c 100644
--- a/src/mixer_plugin.h
+++ b/src/mixer_plugin.h
@@ -38,11 +38,14 @@ struct mixer_plugin {
 	/**
          * Alocates and configures a mixer device.
 	 *
+	 * @param ao the pointer returned by audio_output_plugin.init
+	 * @param param the configuration section, or NULL if there is
+	 * no configuration
 	 * @param error_r location to store the error occuring, or
 	 * NULL to ignore errors
 	 * @return a mixer object, or NULL on error
 	 */
-	struct mixer *(*init)(const struct config_param *param,
+	struct mixer *(*init)(void *ao, const struct config_param *param,
 			      GError **error_r);
 
 	/**