libass: match font attachments based on extension

Instead of only relying on the MIME type, use the file extension as a
fallback for deciding which attachments are fonts and should be fed to
libass.
This also refactors the check into a separate function in mpcommon.

1 files changed, 18 insertions, 0 deletions

diff --git a/mpcommon.c b/mpcommon.c
index 61d61c743c..5756b8ad6a 100644
--- a/mpcommon.c
+++ b/mpcommon.c
@@ -297,6 +297,24 @@ int select_audio(demuxer_t* demuxer, int audio_id, char* audio_lang)
     return demuxer->audio->id;
 }
 
+bool attachment_is_font(struct demux_attachment *att)
+{
+    if (!att->name || !att->type || !att->data || !att->data_size)
+        return false;
+    // match against MIME types
+    if (strcmp(att->type, "application/x-truetype-font") == 0
+        || strcmp(att->type, "application/x-font") == 0)
+        return true;
+    // fallback: match against file extension
+    if (strlen(att->name) > 4) {
+        char *ext = att->name + strlen(att->name) - 4;
+        if (strcasecmp(ext, ".ttf") == 0 || strcasecmp(ext, ".ttc") == 0
+            || strcasecmp(ext, ".otf") == 0)
+            return true;
+    }
+    return false;
+}
+
 /* Parse -noconfig common to both programs */
 int disable_system_conf=0;
 int disable_user_conf=0;