1 files changed, 41 insertions, 0 deletions
diff --git a/libavcodec/dvbtxt.h b/libavcodec/dvbtxt.h
new file mode 100644
index 0000000..ff88fcf
--- /dev/null
+++ b/libavcodec/dvbtxt.h
@@ -0,0 +1,41 @@
+/*
+ * DVB teletext common functions.
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_DVBTXT_H
+#define AVCODEC_DVBTXT_H
+
+#include "libavutil/attributes.h"
+
+/* Returns true if data identifier matches a teletext stream according to EN
+ * 301 775 section 4.4.2 */
+static av_always_inline int ff_data_identifier_is_teletext(int data_identifier)
+{
+    return (data_identifier >= 0x10 && data_identifier <= 0x1F ||
+            data_identifier >= 0x99 && data_identifier <= 0x9B);
+}
+
+/* Returns true if data unit id matches EBU teletext data according to
+ * EN 301 775 section 4.4.2 */
+static av_always_inline int ff_data_unit_id_is_teletext(int data_unit_id)
+{
+    return (data_unit_id == 0x02 || data_unit_id == 0x03);
+}
+
+#endif /* AVCODEC_DVBTXT_H */