removed codecs to save memory

lib/ESP32-audioI2S/examples/ES8311/es8311.h

@@ -0,0 +1,48 @@
+#pragma once
+#include <Arduino.h>
+#include <Wire.h>
+
+
+#define ES8311_ADDR              0x18
+#define ES8311_SAMPLE_RATE48     48000
+#define ES8311_BITS_PER_SAMPLE16 16
+
+struct _coeff_div {       /* Clock coefficient structure */
+    uint32_t mclk;        /* mclk frequency */
+    uint32_t rate;        /* sample rate */
+    uint8_t pre_div;      /* the pre divider with range from 1 to 8 */
+    uint8_t pre_multi;    /* the pre multiplier with 0: 1x, 1: 2x, 2: 4x, 3: 8x selection */
+    uint8_t adc_div;      /* adcclk divider */
+    uint8_t dac_div;      /* dacclk divider */
+    uint8_t fs_mode;      /* double speed or single speed, =0, ss, =1, ds */
+    uint8_t lrck_h;       /* adclrck divider and daclrck divider */
+    uint8_t lrck_l;
+    uint8_t bclk_div;     /* sclk divider */
+    uint8_t adc_osr;      /* adc osr */
+    uint8_t dac_osr;      /* dac osr */
+};
+
+class ES8311{
+
+private:
+    TwoWire *_TwoWireInstance = NULL;	// TwoWire Instance
+    uint32_t _mclk_hz = 48000 * 256; // default MCLK frequency
+public:
+	// Constructor.
+    ES8311(TwoWire  *TwoWireInstance = &Wire);
+    ~ES8311();
+    bool begin(int32_t sda, int32_t scl, uint32_t frequency);
+    bool setVolume(uint8_t volume);
+    uint8_t getVolume();
+    bool setSampleRate(uint32_t sample_rate);
+    bool setBitsPerSample(uint8_t bps);
+    bool enableMicrophone(bool enable);
+    bool setMicrophoneGain(uint8_t gain);
+    uint8_t getMicrophoneGain();
+    void read_all();
+protected:
+    int get_coeff(uint32_t mclk, uint32_t rate);
+	bool WriteReg(uint8_t reg, uint8_t val);
+	uint8_t ReadReg(uint8_t reg);
+};
+