implemented dvdnav_lang_from_aid() to retrieve audio language

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@21619 b3059339-0415-0410-9bf9-f77b7e298cf2

1 files changed, 30 insertions, 0 deletions

diff --git a/stream/stream_dvdnav.c b/stream/stream_dvdnav.c
index 90172be1ab..e5fd6028c1 100644
--- a/stream/stream_dvdnav.c
+++ b/stream/stream_dvdnav.c
@@ -515,6 +515,36 @@ int dvdnav_aid_from_lang(stream_t *stream, unsigned char *language) {
   return -1;
 }
 
+/**
+ * \brief dvdnav_lang_from_aid() assigns to buf the language corresponding to audio id 'aid'
+ * \param stream: - stream pointer
+ * \param sid: physical subtitle id
+ * \param buf: buffer to contain the 2-chars language string
+ * \return 0 on error, 1 if successful
+ */
+int dvdnav_lang_from_aid(stream_t *stream, int aid, unsigned char *buf) {
+  uint8_t lg;
+  uint16_t lang;
+  dvdnav_priv_t * priv=(dvdnav_priv_t*)stream->priv;
+
+  if(aid >= 0x80 && aid < 0x88)
+    aid -= 0x80;
+  else if(aid >= 0x88 && aid <= 0x8F)
+    aid -= 0x88;
+  else if(aid >= 0xA0 && aid <= 0xAF)
+    aid -= 0xA0;
+  if(aid < 0)
+    return 0;
+  lg = dvdnav_get_audio_logical_stream(priv->dvdnav, aid);
+  if(lg == 0xff) return 0;
+  lang = dvdnav_audio_stream_to_lang(priv->dvdnav, lg);
+  if(lang == 0xffff) return 0;
+  buf[0] = lang >> 8;
+  buf[1] = lang & 0xFF;
+  buf[2] = 0;
+  return 1;
+}
+
 
 /**
  * \brief dvdnav_sid_from_lang() returns the subtitle id corresponding to the language code 'lang'