meta: add getter for meta value priority

* Add two getter function on the meta API, `vlc_meta_GetWithPriority`
   and `vlc_meta_GetExtraWithPriority`.

include/vlc_meta.h

@@ -81,7 +81,7 @@ struct vlc_meta_t;
 VLC_API vlc_meta_t * vlc_meta_New( void ) VLC_USED;
 VLC_API void vlc_meta_Delete( vlc_meta_t *m );
 VLC_API void vlc_meta_SetWithPriority( vlc_meta_t *p_meta, vlc_meta_type_t meta_type, const char *psz_val, vlc_meta_priority_t priority );
-VLC_API const char * vlc_meta_Get( const vlc_meta_t *p_meta, vlc_meta_type_t meta_type );
+VLC_API const char *vlc_meta_GetWithPriority(const vlc_meta_t *p_meta, vlc_meta_type_t meta_type, vlc_meta_priority_t *restrict priority);
 
 /**
  * set the meta extra
@@ -93,7 +93,7 @@ VLC_API const char * vlc_meta_Get( const vlc_meta_t *p_meta, vlc_meta_type_t met
  * \param priority metadata priority (in terms of vlc_meta_priority_t)
  */
 VLC_API void vlc_meta_SetExtraWithPriority( vlc_meta_t *m, const char *psz_name, const char *psz_value, vlc_meta_priority_t priority );
-VLC_API const char * vlc_meta_GetExtra( const vlc_meta_t *m, const char *psz_name );
+VLC_API const char *vlc_meta_GetExtraWithPriority(const vlc_meta_t *m, const char *name, vlc_meta_priority_t *priority);
 VLC_API unsigned vlc_meta_GetExtraCount( const vlc_meta_t *m );
 
 /**
@@ -126,6 +126,9 @@ VLC_API int input_item_WriteMeta(vlc_object_t *, input_item_t *);
 #define vlc_meta_Set( meta, meta_type, b )             vlc_meta_SetWithPriority( meta, meta_type, b, VLC_META_PRIORITY_BASIC )
 #define vlc_meta_SetExtra( meta, psz_name, psz_value ) vlc_meta_SetExtraWithPriority( meta, psz_name, psz_value, VLC_META_PRIORITY_BASIC )
 
+#define vlc_meta_Get(meta, meta_type) vlc_meta_GetWithPriority(meta, meta_type, NULL)
+#define vlc_meta_GetExtra(meta, psz_name) vlc_meta_GetExtraWithPriority(meta, psz_name, NULL)
+
 /* Setters for meta.
  * Warning: Make sure to use the input_item meta setters (defined in vlc_input_item.h)
  * instead of those one. */

src/input/meta.c

@@ -158,9 +158,16 @@ void vlc_meta_SetWithPriority( vlc_meta_t *p_meta, vlc_meta_type_t meta_type, co
     p_meta->meta[meta_type].priority = priority;
 }
 
-const char *vlc_meta_Get( const vlc_meta_t *p_meta, vlc_meta_type_t meta_type )
+const char *vlc_meta_GetWithPriority(const vlc_meta_t *meta, vlc_meta_type_t meta_type, vlc_meta_priority_t *restrict priority)
 {
-    return p_meta->meta[meta_type].value;
+    assert(meta != NULL);
+    assert(meta_type >= 0);
+    assert(meta_type < VLC_META_TYPE_COUNT);
+
+    if (priority != NULL) {
+        *priority = meta->meta[meta_type].priority;
+    }
+    return meta->meta[meta_type].value;
 }
 
 void vlc_meta_SetExtraWithPriority( vlc_meta_t *m, const char *psz_name, const char *psz_value, vlc_meta_priority_t priority )
@@ -174,14 +181,21 @@ void vlc_meta_SetExtraWithPriority( vlc_meta_t *m, const char *psz_name, const c
         vlc_meta_InsertExtra( m, psz_name, psz_value, priority );
 }
 
-const char * vlc_meta_GetExtra( const vlc_meta_t *m, const char *psz_name )
+const char *vlc_meta_GetExtraWithPriority(const vlc_meta_t *m, const char *name, vlc_meta_priority_t *priority)
 {
-    struct vlc_meta_value *meta_value = vlc_dictionary_value_for_key(&m->extra_tags, psz_name);
-    if( !meta_value )
+    assert(m != NULL);
+    assert(name != NULL);
+
+    struct vlc_meta_value *meta_value = vlc_dictionary_value_for_key(&m->extra_tags, name);
+    if(meta_value == NULL)
         return NULL;
+    if (priority != NULL) {
+        *priority = meta_value->priority;
+    }
     return meta_value->value;
 }
 
+
 unsigned vlc_meta_GetExtraCount( const vlc_meta_t *m )
 {
     return vlc_dictionary_keys_count(&m->extra_tags);

src/libvlccore.sym

@@ -680,8 +680,8 @@ vlc_list_children
 vlc_meta_SetExtraWithPriority
 vlc_meta_CopyExtraNames
 vlc_meta_Delete
-vlc_meta_Get
-vlc_meta_GetExtra
+vlc_meta_GetWithPriority
+vlc_meta_GetExtraWithPriority
 vlc_meta_GetExtraCount
 vlc_meta_GetStatus
 vlc_meta_Merge