+/* dbus signal emit */
+void _mmcamcorder_emit_dbus_signal(GDBusConnection *conn, const char *object_name,
+ const char *interface_name, const char *signal_name, int value);
+
+/* audio buffer */
+int _mmcamcorder_get_audiosrc_blocksize(int samplerate, int format, int channel, int interval, int *blocksize);
+