patch: add sdp_media_session_rattr()

Author: alfredh

include/re_sdp.h

@@ -126,6 +126,9 @@ struct sdp_format *sdp_media_format_apply(const struct sdp_media *m,
 					  sdp_format_h *fmth, void *arg);
 const struct list *sdp_media_format_lst(const struct sdp_media *m, bool local);
 const char *sdp_media_rattr(const struct sdp_media *m, const char *name);
+const char *sdp_media_session_rattr(const struct sdp_media *m,
+				    const struct sdp_session *sess,
+				    const char *name);
 const char *sdp_media_rattr_apply(const struct sdp_media *m, const char *name,
 				  sdp_attr_h *attrh, void *arg);
 const char *sdp_media_name(const struct sdp_media *m);

src/sdp/media.c

@@ -860,6 +860,29 @@ const char *sdp_media_rattr(const struct sdp_media *m, const char *name)
 }
 
 
+/**
+ * Get a remote attribute from an SDP Media line or the SDP session
+ *
+ * @param m     SDP Media line
+ * @param sess  SDP Session
+ * @param name  Attribute name
+ *
+ * @return Attribute value, NULL if not found
+ */
+const char *sdp_media_session_rattr(const struct sdp_media *m,
+				    const struct sdp_session *sess,
+				    const char *name)
+{
+	const char *val;
+
+	val = sdp_media_rattr(m, name);
+	if (!val)
+		val = sdp_session_rattr(sess, name);
+
+	return val;
+}
+
+
 /**
  * Apply a function handler to all matching remote attributes
  *