Merge pull request #334 from jurgenbelien/master

Switch headphone source between input and DAC

control_sgtl5000.h

 #include <AudioStream.h>
 #include "AudioControl.h"
 
+// SGTL5000-specific defines for headphones
+#define AUDIO_HEADPHONE_DAC 0
+#define AUDIO_HEADPHONE_LINEIN 1
+
 class AudioControlSGTL5000 : public AudioControl
 {
 public:
 			return false;
 		}
 	}
+	bool headphoneSelect(int n) {
+		if (n == AUDIO_HEADPHONE_DAC) {
+			return write(0x0024, ana_ctrl | (1<<6)); // route DAC to headphones out
+		} else if (n == AUDIO_HEADPHONE_LINEIN) {
+			return write(0x0024, ana_ctrl & ~(1<<6)); // route linein to headphones out
+		} else {
+			return false;
+		}
+	}
 	bool volume(float left, float right);
 	bool micGain(unsigned int dB);
 	bool lineInLevel(uint8_t n) { return lineInLevel(n, n); }