matroska: handle matroska and webm doctype versions equally

The original plan was to let WebM v1 be the same as Matroska v2 (with
extra constraints), but for simplicity it was decided to handle the
versions equally, such that e.g. SimpleBlock is only allowed in WebM v2.

gst/matroska/matroska-demux.c

@@ -2581,15 +2581,13 @@ gst_matroska_demux_parse_header (GstMatroskaDemux * demux)
     doctype_class = g_type_class_ref (GST_TYPE_MATROSKA_DOCTYPE);
     doctype_value = g_enum_get_value_by_nick (doctype_class, doctype);
     if (doctype_value) {
-      guint max_version =
-          doctype_value->value == GST_MATROSKA_DOCTYPE_MATROSKA ? 2 : 1;
-      if (version <= max_version) {
+      if (version <= 2) {
         GST_INFO_OBJECT (demux, "Input is %s version %d", doctype, version);
         ret = GST_FLOW_OK;
       } else {
         GST_ELEMENT_ERROR (demux, STREAM, DEMUX, (NULL),
-            ("Demuxer version (%d) is too old to read %s version %d",
-                max_version, doctype, version));
+            ("Demuxer version (2) is too old to read %s version %d",
+                doctype, version));
       }
     } else {
       GST_ELEMENT_ERROR (demux, STREAM, WRONG_TYPE, (NULL),

gst/matroska/matroska-mux.c

@@ -2600,7 +2600,7 @@ gst_matroska_mux_write_data (GstMatroskaMux * mux, GstMatroskaPad * collect_pad)
     }
   }
 
-  /* write the block, for Matroska v2 and WebM use SimpleBlock if possible
+  /* write the block, for doctype v2 use SimpleBlock if possible
    * one slice (*breath*).
    * FIXME: Need to do correct lacing! */
   relative_timestamp64 = GST_BUFFER_TIMESTAMP (buf) - mux->cluster_time;
@@ -2612,10 +2612,7 @@ gst_matroska_mux_write_data (GstMatroskaMux * mux, GstMatroskaPad * collect_pad)
     relative_timestamp64 -= mux->time_scale / 2;
   }
   relative_timestamp = relative_timestamp64 / (gint64) mux->time_scale;
-  if (((mux->doctype == GST_MATROSKA_DOCTYPE_MATROSKA
-              && mux->doctype_version > 1)
-          || mux->doctype == GST_MATROSKA_DOCTYPE_WEBM)
-      && !write_duration) {
+  if (mux->doctype_version > 1 && !write_duration) {
     int flags =
         GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_DELTA_UNIT) ? 0 : 0x80;