small fixes (#109)

components/lightsnapcast/include/player.h

@@ -1,12 +1,16 @@
 #ifndef __PLAYER_H__
 #define __PLAYER_H__
 
-#include "driver/i2s.h"
+#include "driver/i2s_std.h"
 #include "esp_types.h"
 #include "freertos/FreeRTOS.h"
 #include "sdkconfig.h"
 #include "snapcast.h"
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define I2S_PORT I2S_NUM_0
 
 // TODO: maybe calculate this dynamically based on chunk duration and buffer
@@ -77,5 +81,7 @@ int32_t get_diff_to_server(int64_t *tDiff);
 int32_t server_now(int64_t *sNow, int64_t *diff2Server);
 
 int32_t pcm_chunk_queue_msg_waiting(void);
-
+#ifdef __cplusplus
+}
+#endif
 #endif  // __PLAYER_H__