static int detect_unknown_subobject(AVFormatContext *s, int64_t offset, int64_t size);
static const GUIDParseTable *find_guid(ff_asf_guid guid);
-static int asf_probe(AVProbeData *pd)
+static int asf_probe(const AVProbeData *pd)
{
/* check file header */
if (!ff_guidcmp(pd->buf, &ff_asf_header))