avcodec/mediacodec_surface: define and use FFANativeWindow to mimic NDK interface

This will make it easy to switch to ANativeWindow_fromSurface
and ANativeWindow_release in the future.
Signed-off-by: Aman Gupta <aman@tmm1.net>

libavcodec/mediacodec_surface.c

@@ -25,7 +25,7 @@
 #include "ffjni.h"
 #include "mediacodec_surface.h"
 
-void *ff_mediacodec_surface_ref(void *surface, void *log_ctx)
+FFANativeWindow *ff_mediacodec_surface_ref(void *surface, void *log_ctx)
 {
     JNIEnv *env = NULL;
 
@@ -37,7 +37,7 @@ void *ff_mediacodec_surface_ref(void *surface, void *log_ctx)
     return (*env)->NewGlobalRef(env, surface);
 }
 
-int ff_mediacodec_surface_unref(void *surface, void *log_ctx)
+int ff_mediacodec_surface_unref(FFANativeWindow *window, void *log_ctx)
 {
     JNIEnv *env = NULL;
 
@@ -46,7 +46,7 @@ int ff_mediacodec_surface_unref(void *surface, void *log_ctx)
         return AVERROR_EXTERNAL;
     }
 
-    (*env)->DeleteGlobalRef(env, surface);
+    (*env)->DeleteGlobalRef(env, window);
 
     return 0;
 }

libavcodec/mediacodec_surface.h

@@ -25,7 +25,10 @@
 
 #include "libavcodec/avcodec.h"
 
-void *ff_mediacodec_surface_ref(void *surface, void *log_ctx);
-int ff_mediacodec_surface_unref(void *surface, void *log_ctx);
+struct FFANativeWindow;
+typedef struct FFANativeWindow FFANativeWindow;
+
+FFANativeWindow *ff_mediacodec_surface_ref(void *surface, void *log_ctx);
+int ff_mediacodec_surface_unref(FFANativeWindow *window, void *log_ctx);
 
 #endif /* AVCODEC_MEDIACODEC_SURFACE_H */