demux: really disable cache for sub-demuxers

It seems the so called demuxer cache wasn't really disabled for
sub-demuxers (timeline stuff). This was relatively harmless, since the
actual packet data was shared anyway via refcounting. But with the
addition of a mmap cache backend, this may change a lot.

So strictly disable any caching for sub-demuxers. This assumes that
users of sub-demuxers (only demux_timeline.c by now?) strictly use
demux_read_any_packet(), since demux_read_packet_async() will require
some minor read-ahead if a low level packet read returned a packet for a
different stream.

This requires some awkward messing with this fucking heap of trash. The
thing that is really wrong here is that the demuxer API mixes different
concepts, and sub-demuxers get the same API as decoders, and use the
cache code.

1 files changed, 1 insertions, 0 deletions

diff --git a/demux/demux.h b/demux/demux.h
index da315adebb..63897c342d 100644
--- a/demux/demux.h
+++ b/demux/demux.h
@@ -158,6 +158,7 @@ typedef struct demux_attachment
 } demux_attachment_t;
 
 struct demuxer_params {
+    bool is_top_level; // if true, it's not a sub-demuxer (enables cache etc.)
     char *force_format;
     int matroska_num_wanted_uids;
     struct matroska_segment_uid *matroska_wanted_uids;