Fix AudioInputAnalog

input_adc.cpp

 DMAMEM static uint16_t analog_rx_buffer[AUDIO_BLOCK_SAMPLES];
 audio_block_t * AudioInputAnalog::block_left = NULL;
 uint16_t AudioInputAnalog::block_offset = 0;
+uint16_t AudioInputAnalog::dc_average = 0;
 bool AudioInputAnalog::update_responsibility = false;
 DMAChannel AudioInputAnalog::dma(false);
 
 
-AudioInputAnalog::AudioInputAnalog(uint8_t pin) : AudioStream(0, NULL)
+void AudioInputAnalog::init(uint8_t pin)
 {
 	uint32_t i, sum=0;
 

input_adc.h

 class AudioInputAnalog : public AudioStream
 {
 public:
-        AudioInputAnalog(uint8_t pin);
-        AudioInputAnalog() : AudioStream(0, NULL) { AudioInputAnalog(A2); }
+        AudioInputAnalog() : AudioStream(0, NULL) { init(A2); }
+        AudioInputAnalog(uint8_t pin) : AudioStream(0, NULL) { init(pin); }
         virtual void update(void);
         friend void dma_ch9_isr(void);
 private:
         static audio_block_t *block_left;
         static uint16_t block_offset;
-	uint16_t dc_average;
+	static uint16_t dc_average;
         static bool update_responsibility;
 	static DMAChannel dma;
 	static void isr(void);
+	static void init(uint8_t pin);
 };
 
 #endif