core: matroska: support concatenated segments

Matroska files can contain multiple segments, which are literally
further Matroska files appended to the main file. They can be referenced
by segment linking.

While this is an extraordinarily useless and dumb feature, we support it
for the hell of it.

This is implemented by adding a further demuxer parameter for skipping
segments. When scanning for linked segments, each file is opened
multiple times, until there are no further segments found. Each segment
will have a separate demuxer instance (with a separate file handle
etc.).

It appears the Matroska spec. has an even worse feature for segments:
live streaming can completely reconfigure the stream by starting a new
segment. We won't add support for it, because there are 0 people on this
earth who think Matroska life streaming is a good idea. (As opposed to
serving Matroska/WebM files via HTTP.)

1 files changed, 2 insertions, 0 deletions

diff --git a/demux/demux.h b/demux/demux.h
index c922dc8bb5..fb695e6a45 100644
--- a/demux/demux.h
+++ b/demux/demux.h
@@ -211,6 +211,8 @@ typedef struct demux_attachment
 
 struct demuxer_params {
     unsigned char (*matroska_wanted_uids)[16];
+    int matroska_wanted_segment;
+    bool *matroska_was_valid;
 };
 
 typedef struct demuxer {