---
libavformat/avlanguage.c | 14 ++++++++++++++
libavformat/avlanguage.h | 5 +++++
2 files changed, 19 insertions(+)
diff --git a/libavformat/avlanguage.c b/libavformat/avlanguage.c
index e606ef2..a4b916f 100644
--- a/libavformat/avlanguage.c
+++ b/libavformat/avlanguage.c
@@ -763,3 +763,17 @@ const char *av_convert_lang_to(const char *lang, enum AVLangCodespace target_cod
return NULL;
}
+
+int av_islang(const char *lang)
+{
+ const LangEntry *entry = NULL;
+ const int NB_LANGENTRIES = FF_ARRAY_ELEMS(lang_table);
+
+ entry = bsearch(lang,
+ lang_table,
+ NB_LANGENTRIES,
+ sizeof(LangEntry),
+ lang_table_compare);
+
+ return entry != NULL;
+}
diff --git a/libavformat/avlanguage.h b/libavformat/avlanguage.h
index 2ec3e2d..24f3187 100644
--- a/libavformat/avlanguage.h
+++ b/libavformat/avlanguage.h
@@ -36,4 +36,9 @@ enum AVLangCodespace {
*/
const char *av_convert_lang_to(const char *lang, enum AVLangCodespace target_codespace);
+/**
+ * Check if lang is a valid language.
+ */
+int av_islang(const char *lang);
+
#endif /* AVFORMAT_AVLANGUAGE_H */
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