avformat/matroskadec: Export FileDescription as title tag

Each AttachedFile in Matroska can have a FileDescription element that
contains a human-friendly name for the attached file; yet this element
has been ignored up until now. This commit changes this and exports it
as title tag instead (the Matroska muxer mapped the title tag to the
AttachedFile element since support for Attachments was added).
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavformat/matroskadec.c

@@ -259,6 +259,7 @@ typedef struct MatroskaTrack {
 typedef struct MatroskaAttachment {
     uint64_t uid;
     char *filename;
+    char *description;
     char *mime;
     EbmlBin bin;
 
@@ -587,7 +588,7 @@ static EbmlSyntax matroska_attachment[] = {
     { MATROSKA_ID_FILENAME,     EBML_UTF8, 0, offsetof(MatroskaAttachment, filename) },
     { MATROSKA_ID_FILEMIMETYPE, EBML_STR,  0, offsetof(MatroskaAttachment, mime) },
     { MATROSKA_ID_FILEDATA,     EBML_BIN,  0, offsetof(MatroskaAttachment, bin) },
-    { MATROSKA_ID_FILEDESC,     EBML_NONE },
+    { MATROSKA_ID_FILEDESC,     EBML_UTF8, 0, offsetof(MatroskaAttachment, description) },
     CHILD_OF(matroska_attachments)
 };
 
@@ -2914,6 +2915,8 @@ static int matroska_read_header(AVFormatContext *s)
                 break;
             av_dict_set(&st->metadata, "filename", attachments[j].filename, 0);
             av_dict_set(&st->metadata, "mimetype", attachments[j].mime, 0);
+            if (attachments[j].description)
+                av_dict_set(&st->metadata, "title", attachments[j].description, 0);
             st->codecpar->codec_id   = AV_CODEC_ID_NONE;
 
             for (i = 0; mkv_image_mime_tags[i].id != AV_CODEC_ID_NONE; i++) {