mixer_control: don't touch mixers of disabled outputs

src/mixer_control.c

@@ -33,6 +33,9 @@ mixer_control_setvol(unsigned int device, int volume, int rel)
 	assert(device < audio_output_count());
 
 	output = audio_output_get(device);
+	if (!output->enabled)
+		return false;
+
 	mixer = ao_plugin_get_mixer(output->plugin, output->data);
 	if (mixer != NULL) {
 		if (rel) {
@@ -61,6 +64,9 @@ mixer_control_getvol(unsigned int device, int *volume)
 	assert(device < audio_output_count());
 
 	output = audio_output_get(device);
+	if (!output->enabled)
+		return false;
+
 	mixer = ao_plugin_get_mixer(output->plugin, output->data);
 	if (mixer != NULL) {
 		int volume2;

src/output_command.c

@@ -26,6 +26,8 @@
 #include "output_command.h"
 #include "output_all.h"
 #include "output_internal.h"
+#include "output_plugin.h"
+#include "mixer_api.h"
 #include "idle.h"
 
 bool
@@ -48,6 +50,7 @@ bool
 audio_output_disable_index(unsigned idx)
 {
 	struct audio_output *ao;
+	struct mixer *mixer;
 
 	if (idx >= audio_output_count())
 		return false;
@@ -57,5 +60,11 @@ audio_output_disable_index(unsigned idx)
 	ao->enabled = false;
 	idle_add(IDLE_OUTPUT);
 
+	mixer = ao_plugin_get_mixer(ao->plugin, ao->data);
+	if (mixer != NULL) {
+		mixer_close(mixer);
+		idle_add(IDLE_MIXER);
+	}
+
 	return true;
 }