avformat/matroskadec: set the default value for BlockAddIDType

Signed-off-by: James Almer <jamrial@gmail.com>

libavformat/matroska.h

@@ -358,6 +358,10 @@ typedef enum {
   MATROSKA_VIDEO_PROJECTION_TYPE_MESH               = 3,
 } MatroskaVideoProjectionType;
 
+typedef enum {
+  MATROSKA_BLOCK_ADD_ID_TYPE_DEFAULT                = 0,
+} MatroskaBlockAddIDType;
+
 /*
  * Matroska Codec IDs, strings
  */

libavformat/matroskadec.c

@@ -591,7 +591,7 @@ static EbmlSyntax matroska_track_operation[] = {
 static EbmlSyntax matroska_block_addition_mapping[] = {
     { MATROSKA_ID_BLKADDIDVALUE,      EBML_UINT, 0, 0, offsetof(MatroskaBlockAdditionMapping, value) },
     { MATROSKA_ID_BLKADDIDNAME,       EBML_STR,  0, 0, offsetof(MatroskaBlockAdditionMapping, name) },
-    { MATROSKA_ID_BLKADDIDTYPE,       EBML_UINT, 0, 0, offsetof(MatroskaBlockAdditionMapping, type) },
+    { MATROSKA_ID_BLKADDIDTYPE,       EBML_UINT, 0, 0, offsetof(MatroskaBlockAdditionMapping, type), { .u = MATROSKA_BLOCK_ADD_ID_TYPE_DEFAULT } },
     { MATROSKA_ID_BLKADDIDEXTRADATA,  EBML_BIN,  0, 0, offsetof(MatroskaBlockAdditionMapping, extradata) },
     CHILD_OF(matroska_track)
 };