added mute_PCM() - sets or unsets VALID in VUCP (and adjusts PARITY)

output_spdif.h

 	virtual void update(void);
 	void begin(void);
 	friend class AudioInputSPDIF;
+	static void mute_PCM(const bool mute);
 protected:
-	AudioOutputSPDIF(int dummy): AudioStream(2, inputQueueArray) {}
+	AudioOutputSPDIF(int dummy): AudioStream(2, inputQueueArray) {}	
 	static void config_SPDIF(void);
 	static audio_block_t *block_left_1st;
 	static audio_block_t *block_right_1st;
 	static bool update_responsibility;
 	static DMAChannel dma;
-	static void isr(void);
+	static void isr(void);		
 private:
+    static uint32_t vucp;
 	static audio_block_t *block_left_2nd;
 	static audio_block_t *block_right_2nd;
 	static uint16_t block_left_offset;
 	static uint16_t block_right_offset;
-	audio_block_t *inputQueueArray[2];
+	audio_block_t *inputQueueArray[2];	
 };