状态栏添加音量显示并添加音量调节功能

src/audio.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include <glib.h>
+#include <stdint.h>
+
+typedef struct pulse_context_t pulse_context_t;
+
+typedef struct pulse_t {
+  int volume_percent;
+  bool mute;
+  bool inited;
+  char device_name[254];
+} pulse_t;
+
+typedef void (*pulse_notify_t)(pulse_t *pulse);
+
+pulse_context_t *init_pulse(GMainContext *context, pulse_notify_t callback);
+void change_pulse_volume(pulse_context_t *context, int step);
+void toggle_pulse_mute(pulse_context_t *context);
+void clean_pulse(pulse_context_t *context);