sub: sub-filter-regex and jsre: support ass-to-plaintext

Using --sub-filter-regex-plain (default:no)

The ass-to-plaintext functionality already existed at sd_ass.c, but
it's internal and uses a private buffer type, so a trivial utility
wrapper was added with standard char*/bstr interface.

The plaintext can be multi-line, and the multi-line regexp flag is now
always set, but only affects plaintext (the ASS source is one line).

1 files changed, 5 insertions, 0 deletions

diff --git a/sub/sd.h b/sub/sd.h
index 2e8d71ba79..6801a383b7 100644
--- a/sub/sd.h
+++ b/sub/sd.h
@@ -101,4 +101,9 @@ int sd_ass_fmt_offset(const char *event_format);
 // on malformed event: warns and returns (bstr){NULL,0}
 bstr sd_ass_pkt_text(struct sd_filter *ft, struct demux_packet *pkt, int offset);
 
+// convert \0-terminated "Text" (ass) content to plaintext, possibly in-place.
+// result.start is out, result.len is MIN(out_siz, strlen(in)) or smaller.
+// if there's room: out[result.len] is set to \0. out == in is allowed.
+bstr sd_ass_to_plaintext(char *out, size_t out_siz, const char *in);
+
 #endif