Add support for drtic (dtc) subtitles format

[kreddit]

Summary of the bug: Feature request: add support for drtic subtitles (.dtc extension).

% mplayer -v
MPlayer Redxii-SVN-r38151-6.2.0 (x86_64) (C) 2000-2019 MPlayer Team
Using FFmpeg N-94664-g0821bc4eee (2019-08-26 16:09:11 -0700)
Compiled on 2019-08-28 01:29:43 EDT (rev. 1)

Sample subtitles:

• ​a.cry.in.the.dark.(1988).eng.1cd.(93610).dtc
• ​miami.vice.brothers.keeper.(1984).eng.1cd.(4362446).dtc
• ​psycho.(1960).spa.1cd.(32930).dtc
• ​grave.of.the.fireflies.(1988).ger.1cd.(111533).dtc
• ​the.life.of.david.gale.(2003).jpn.2cd.(151590).dtc
• ​aladdin.(1992).bos.1cd.(4030548).dtc
• ​the.matrix.(1999).fre.1cd.(114844).dtc

Further information can be found here:

• ​http://czdream.wz.cz/index_en.html
• ​http://czdream.wz.cz/about.html
• ​Latest Version of Subtitle player enigma2
• ​Advanced Subtitle Downloader
• ​Drtic - English Tutorial by Pingu v1.2

[reimar]

Just to check, you've tried it?
Because it looks to me like the format is 90% identical to microdvd format, which is supported. Just the time stamps might be off.
Though without a specification it's not possible to really properly support it.

[reimar]

Ok, it might need a small adjustment to format autodetection:

Index: sub/subreader.c
===================================================================
--- sub/subreader.c	(Revision 38313)
+++ sub/subreader.c	(Arbeitskopie)
@@ -1159,6 +1159,10 @@
 	if (!stream_read_line (st, line, LINE_LEN, utf16))
 	    return SUB_INVALID;
 
+	// drtic/dtc format starts with [JRT2: line. It is not identical
+	// to microdvd, but very close and we have no spec
+	if (strncmp(line, "[JRT2:", 6) == 0)
+		{*uses_time=0;return SUB_MICRODVD;}
 	if (sscanf (line, "{%d}{%d}", &i, &i)==2)
 		{*uses_time=0;return SUB_MICRODVD;}
 	if (sscanf (line, "{%d}{}", &i)==1)

I can't really test, but it might work with just that.

[reimar]

An easier way to test that avoids needing to recompile is to just remove the first line of the subtitles, should have the same effect as my patch

[reimar]

The patch mentioned above is included in 1.5.
That is not full support but I think it's good enough to close this one, and have specific problems with this limited support reported in new tickets.