extern DECLSPEC int cec_set_hdmi_port(uint8_t iPort);
-extern DECLSPEC int cec_volume_up(void);
+extern DECLSPEC int cec_volume_up(int bWait = 1);
-extern DECLSPEC int cec_volume_down(void);
+extern DECLSPEC int cec_volume_down(int bWait = 1);
-extern DECLSPEC int cec_mute_audio(void);
+extern DECLSPEC int cec_mute_audio(int bWait = 1);
#ifdef __cplusplus
};