"application/octet-stream", NULL);
}
+/* SSA/ASS subtitles
+ *
+ * http://en.wikipedia.org/wiki/SubStation_Alpha
+ * http://matroska.org/technical/specs/subtitles/ssa.html
+ */
+static void
+ssa_type_find (GstTypeFind * tf, gpointer private)
+{
+ const gchar *start, *end, *ver_str, *media_type = NULL;
+ const guint8 *data;
+ gchar *str, *script_type, *p = NULL;
+ gint64 len;
+
+ data = gst_type_find_peek (tf, 0, 32);
+
+ if (data == NULL)
+ return;
+
+ /* there might be a BOM at the beginning */
+ if (memcmp (data, "[Script Info]", 13) != 0 &&
+ memcmp (data + 2, "[Script Info]", 13) != 0 &&
+ memcmp (data + 3, "[Script Info]", 13) != 0 &&
+ memcmp (data + 4, "[Script Info]", 13) != 0) {
+ return;
+ }
+
+ /* now check if we have SSA or ASS */
+ len = gst_type_find_get_length (tf);
+ if (len > 8192)
+ len = 8192;
+
+ data = gst_type_find_peek (tf, 0, len);
+ if (data == NULL)
+ return;
+
+ /* skip BOM */
+ start = (gchar *) memchr (data, '[', 5);
+ g_assert (start);
+ len -= (start - (gchar *) data);
+
+ /* ignore anything non-UTF8 for now, in future we might at least allow
+ * other UTF variants that are clearly prefixed with the appropriate BOM */
+ if (!g_utf8_validate (start, len, &end) && (len - (end - start)) > 6) {
+ GST_FIXME ("non-UTF8 SSA/ASS file");
+ return;
+ }
+
+ /* something at start, but not a UTF-8 BOM? */
+ if (data[0] != '[' && (data[0] != 0xEF || data[1] != 0xBB || data[2] != 0xBF))
+ return;
+
+ /* ignore any partial UTF-8 characters at the end */
+ len = end - start;
+
+ /* create a NUL-terminated string so it's easier to process it safely */
+ str = g_strndup (start, len - 1);
+ script_type = strstr (str, "ScriptType:");
+ if (script_type != NULL) {
+ gdouble version;
+
+ ver_str = script_type + 11;
+ while (*ver_str == ' ' || *ver_str == 'v' || *ver_str == 'V')
+ ++ver_str;
+ version = g_ascii_strtod (ver_str, &p);
+ if (version == 4.0 && p != NULL && *p == '+')
+ media_type = "application/x-ass";
+ else if (version >= 1.0 && version <= 4.0)
+ media_type = "application/x-ssa";
+ }
+
+ if (media_type == NULL) {
+ if (strstr (str, "[v4+ Styles]") || strstr (str, "[V4+ Styles]"))
+ media_type = "application/x-ass";
+ else if (strstr (str, "[v4 Styles]") || strstr (str, "[V4 Styles]"))
+ media_type = "application/x-ssa";
+ }
+
+ if (media_type != NULL) {
+ gst_type_find_suggest_simple (tf, GST_TYPE_FIND_MAXIMUM,
+ media_type, "parsed", G_TYPE_BOOLEAN, FALSE, NULL);
+ } else {
+ GST_WARNING ("could not detect SSA/ASS variant");
+ }
+
+ g_free (str);
+}
+
/*** generic typefind for streams that have some data at a specific position***/
typedef struct
{
TYPE_FIND_REGISTER (plugin, "application/octet-stream", GST_RANK_MARGINAL,
dvdiso_type_find, NULL, NULL, NULL, NULL);
+ TYPE_FIND_REGISTER (plugin, "application/x-ssa", GST_RANK_SECONDARY,
+ ssa_type_find, "ssa,ass", NULL, NULL, NULL);
+
return TRUE;
}