Implementing metadata on Arduino IDE about esp32-a2dp HOT 3 CLOSED

public:
  virtual void set_AVRC_metadata(void (*callBack)(uint8_t, const uint8_t*));

protected:
  void (*AVRC_metadata)(uint8_t, const uint8_t*) = NULL;

void BluetoothA2DPSink::set_AVRC_metadata(void (*callBack)(uint8_t, const uint8_t*)){
   this->AVRC_metadata = callBack;
}

 case ESP_AVRC_CT_METADATA_RSP_EVT: {
        if (AVRC_metadata!=NULL){
            AVRC_metadata(rc->meta_rsp.attr_id, rc->meta_rsp.attr_text);
        }
        ESP_LOGI(BT_AV_TAG, "AVRC metadata rsp: attribute id 0x%x, %s", rc->meta_rsp.attr_id, rc->meta_rsp.attr_text);
        free(rc->meta_rsp.attr_text);
        break;
}

void avrc_metadata_callback(uint8_t data1, const uint8_t *data2)
{
  Serial.printf("AVRC metadata rsp: attribute id 0x%x, %s\n", data1, data2);
}
a2dp_sink.set_AVRC_metadata(avrc_metadata_callback);
a2dp_sink.start("BT");