fix compiling errors

main/boards/esp-hi/adc_pdm_audio_codec.h

@@ -0,0 +1,29 @@
+#ifndef _BOX_AUDIO_CODEC_H
+#define _BOX_AUDIO_CODEC_H
+
+#include "audio_codec.h"
+
+#include <esp_codec_dev.h>
+#include <esp_codec_dev_defaults.h>
+
+class AdcPdmAudioCodec : public AudioCodec {
+private:
+    esp_codec_dev_handle_t output_dev_ = nullptr;
+    esp_codec_dev_handle_t input_dev_ = nullptr;
+    gpio_num_t pa_ctrl_pin_ = GPIO_NUM_NC;
+
+    virtual int Read(int16_t* dest, int samples) override;
+    virtual int Write(const int16_t* data, int samples) override;
+
+public:
+    AdcPdmAudioCodec(int input_sample_rate, int output_sample_rate,
+        uint32_t adc_mic_channel, gpio_num_t pdm_speak_p, gpio_num_t pdm_speak_n, gpio_num_t pa_ctl);
+    virtual ~AdcPdmAudioCodec();
+
+    virtual void SetOutputVolume(int volume) override;
+    virtual void EnableInput(bool enable) override;
+    virtual void EnableOutput(bool enable) override;
+    void Start();
+};
+
+#endif // _BOX_AUDIO_CODEC_H