diff --git a/jni/libavosjni/avos_media_metadata_retriever.c b/jni/libavosjni/avos_media_metadata_retriever.c
index 458467f..761578e 100644
--- a/jni/libavosjni/avos_media_metadata_retriever.c
+++ b/jni/libavosjni/avos_media_metadata_retriever.c
@@ -19,11 +19,16 @@
 #include <dlfcn.h>
 #include <stdio.h>
 #include <pthread.h>
+#include <string.h>
+#include <stdlib.h>
 
 #include "jni.h"
 
 #include "libavos.h"
 
+int jniThrowException(C_JNIEnv* env, const char* className, const char* msg);
+int jniGetFDFromFileDescriptor(C_JNIEnv* env, jobject fileDescriptor);
+
 static const avos_mr_handle_t *avos = NULL;
 static const avos_metadata_handle_t *avos_metadata = NULL;
 
diff --git a/jni/libavosjni/avos_media_player.c b/jni/libavosjni/avos_media_player.c
index 895674b..6baff1a 100644
--- a/jni/libavosjni/avos_media_player.c
+++ b/jni/libavosjni/avos_media_player.c
@@ -21,11 +21,15 @@
 #include <dlfcn.h>
 #include <pthread.h>
 #include <sys/queue.h>
+#include <stdlib.h>
 
 #include <android/native_window_jni.h>
 
 #include "jni.h"
 
+int jniThrowException(C_JNIEnv* env, const char* className, const char* msg);
+int jniGetFDFromFileDescriptor(C_JNIEnv* env, jobject fileDescriptor);
+
 #include "libavos.h"
 
 typedef struct event_msg {
diff --git a/jni/libavosjni/libavos.c b/jni/libavosjni/libavos.c
index 0f76270..94cb012 100644
--- a/jni/libavosjni/libavos.c
+++ b/jni/libavosjni/libavos.c
@@ -22,6 +22,8 @@
 #include <stdio.h>
 #include <sys/stat.h>
 #include <fcntl.h>
+#include <sys/types.h>
+#include <unistd.h>
 
 #include "jni.h"
 #include "libavos.h"
@@ -38,6 +40,8 @@ void libavos_set_audio_interface(int audio_interface);
 void libavos_set_codepage(int codepage);
 void libavos_set_output_sample_rate(int sample_rate);
 void libavos_set_passthrough(int force_passthrough);
+void libavos_set_downmix(int downmix);
+void libavos_set_hdmi_supported_audio_codecs(long flag);
 
 fields_t fields;
 extern JavaVM *myVm;