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* demux_mkv: add hacks to avoid a single warningwm42019-09-191-9/+26
| | | | | | | | | | | | | | It prints "Unexpected end of file (no clusters found)" when opening a webm init fragment. The warning is correct, but unwanted in this case. Add tons of kludges to avoid it. (Actually it prints that twice, for audio and video each.) Also, suppress another warning about a seek head entry that points exactly to the end of the file. This is a MATROSKA_ID_CUES, which is harmless, and, very strangely, doesn't point at any cues when you concatenate the init fragment with a media fragment. No idea what that crap is supposed to be.
* demux: make webm dash work by using init fragment on all demuxerswm42019-09-192-32/+23
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Retarded webshit streaming protocols (well, DASH) chop a stream into small fragments, and move unchanging header parts to an "init" fragment to save some bytes (in the case at hand about 300 bytes for each fragment that is 100KB-200KB, sure was worth it, fucking idiots). Since mpv uses an even more retarded hack to inefficiently emulate DASH through EDL, it opens a new demuxer for every fragment. Thus the fragment needs to be virtually concatenated with the init fragment. (To be fair, I'm not sure whether the alternative, reusing the demuxer and letting it see a stream of byte-wise concatenated fragmenmts, would actually be saner.) demux_lavc.c contained a hack for this. Unfortunately, a certain shitty streaming site by an evil company, that will bestow dytopia upon us soon enough, sometimes serves webm based DASH instead of the expected mp4 DASH. And for some reason, libavformat's mkv demuxer can't handle the init fragment or rejects it for some reason. Since I'd rather eat mushrooms grown in Chernobyl than debugging, hacking, or (god no) contributing to FFmpeg, and since Chernobyl is so far away, make it work with our builtin mkv demuxer instead. This is not hard. We just need to copy the hack in demux_lavf.c to demux_mkv.c. Since I'm not _that_ much of a dumbfuck to actually do this, remove the shitty gross demux_lavf.c hack, and replace it by a slightly less bad generic implementation (stream_concat.c from the previous commit), and use it on all demuxers. Although this requires much more code, this frees demux_lavf.c from a hack, and doesn't require adding a duplicated one to demux_mkv.c, so to the naive eye this seems to be a much better outcome. Regarding the code, for some reason stream_memory_open() is never meant to fail, while stream_concat_open() can in extremely obscure situations, and (currently) not in this case, but we handle failure of it anyway. Yep.
* demux: never set demux->stream for timeline messwm42019-09-191-27/+47
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Timeline (demux_timeline, for EDL and mkv ordered chapters) are a mess, because it's the only nested demuxer case. Part of the mess comes from shared struct stream pointers. This makes no sense, because the wrapper (demux_timeline) doesn't have any business setting it. Try to lessen it by not passing down streams. Instead, pass down NULL. This prevents unintended interference, and tightens the ownership rules. Now a demuxer always owns its stream. On the other hand, demuxer->stream can now be NULL. This was never the case before, and consequently there will be new bugs. At least they will be spotted, because they've been bugs before. struct stream is also used to access stream properties (such as whether something is considered a network stream). Most of these have been mirrored in struct demuxer (because the frontend has been forbidden to access struct stream because of threading). But during initialization was still used, so introduce an awkward struct parent_stream_info, which unifies these. Commit e0419fb181b3d2 changed demux_is_network_cached() to use demuxer->stream->streaming instead of demuxer->is_network. To enable timeline stuff to use the cache anyway, change it so that both flags can contribute to it. The stream NULL-check is obviously due to changes in this commit.
* stream: create memory streams in more straightforward waywm42019-09-194-4/+5
| | | | | | | | | | | | | | | Instead of having to rely on the protocol matching, make a function that creates a stream from a stream_info_t directly. Instead of going through a weird indirection with STREAM_CTRL, add a direct argument for non-text arguments to the open callback. Instead of creating a weird dummy mpv_global, just pass an existing one from all callers. (The latter one is just an artifact from the past, where mpv_global wasn't available everywhere.) Actually I just wanted a function that creates a stream without any of that bullshit. This goal was slightly missed, since you still need this heavy "constructor" just to setup a shitty struct with some shitty callbacks.
* demux_playlist: extend maximum line sizewm42019-09-191-1/+1
| | | | | | | | Raise it from 8KB to 512KB. Do this because ytdl_hook.lua generated a 40KB EDL file (from 80KB youtube-dl JSON output), and putting it into a .m3u file for easier debugging failed due to the size limit.
* demux: fix backward demuxing not grabbing all audio packetswm42019-09-191-5/+5
| | | | | | | | | | | | | | | | The previous commit broke audio playback (maybe this is what 4. was about?). But it wasn't the fault of the commit; it just exposed pre-existing issues. If the packet queue search can't get all packets, it checked queue->is_bof to see whether there could be previous packets. But obviously, is_bof can be set, even if the search start packet wasn't the first one. This was especially observable with audio, because audio by default needs preroll packets, and plays artifacts if they're missing. Fix by using the BOF playback condition for this purpose too.
* demux: another questionable backwards playback mud partywm42019-09-191-5/+41
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In theory, backward demuxing does way too much work by doing a full cache seek every time you need to step back through a packet queue. In theory, it would be exceedingly more efficient to just iterate backwards through the queue, but this is not possible because I'm too stingy to add 8 bytes per packet for backlinks. (In theory, you could probably come up with some sort of deque, that'd allow efficient iteration into any direction, but other requirements make this tricky, and I'm currently too dumb/lazy to do this. For example, the queue can grow to millions of elements, all while packet pointers need to stay valid.) Another possibility is to "locally" seek the queue. This still has less overhead than a full seek. Also, it just so happens that, as a side effect, this avoids performing range merging, which commit f4b0e7e942 "broke". That wasn't a bug at all, but since range joining is relatively slow, avoiding it is good. This is really just a coincidental side effect, I'm not even quite sure why it happens this way. There are 4 ugly things about this change: 1. To get a keyframe "before" a certain one, we recompute the target PTS, and then subtract 0.001 as arbitrary number to "fudge" it. This isn't the first place where this is done, and hey, it wasn't my damn idea that MPlayer should use floats for timestamps. (At first, it even used 32 bit timestamps.) 2. This is the first time reader_head is reset to an earlier position outside of the seek code. This might cause conceptual problems since this code is now "duplicated". 3. In theory, find_backward_restart_pos() needs to be run again after the backstep. Normally, the seek code calls it explicitly. We could call it right in the new code, but then the damn function would be recursive. We could shuffle the code around to make it a loop, but even then there'd be an offchance into running into an unexpected corner case (aka subtle bug), where it would loop forever. To avoid refactoring the code and having to think too hard about it, make it deferred - add some new state and the check_backward_seek() function for this. Great, even more subtle mutable state for this backwards shit. 4. I forgot this one, but I can assure you, it's bad. Without doubt someone will have to clean up this slightly in the future (or rip it out), but it won't be me.
* demux: remove some redundancy in backward playback codewm42019-09-191-6/+5
| | | | | | | | | | | This code tries to determine the "current" position, which is used as base for the seek target when it needs to seek back more (the point is to prevent seeking back too far). But compute_keyframe_times() almost computes the same thing, so use that. Unfortunately needs a forward declaration. ("Almost", because it differs in some details that should not really matter.)
* demux_mkv: fix subtitle preroll in some caseswm42019-09-191-7/+6
| | | | | | | | | | | | | | | | | | | | | | Subtitle packets with a timestamp before the seek target may overlap with the seek target anyway. This is why this subtitle preroll crap exists: it needs to return packets before the seek target to ensure that the subtitle is displayed at the seek target. This didn't always work. Maybe it's a regression, but it must have been an old one. The breakage is triggered by heuristic that is to prevent excessive queuing of packets in garbage files (this heuristic apparently became immediately necessary when this preroll mechanism was implemented). If a video keyframe packet was found, but no audio packet yet, then subtitle_preroll was set to 0, and since a_skip_to_keyframe was still 0, the subtitle packet was discarded. The dumb thing is that subtitle and video seeking is finished at this point, so the preroll crap should not be applied at all. Fix this by moving the preoll overflow code into the block that handles preroll.
* demux: turn some redundant assignments into assertswm42019-09-191-3/+5
| | | | | | | | demux_packet.next should not be used outside of demux.c, and in this case it's a packet that was just passed to demux.c from the outside. demux_packet.stream is already set by the demuxer, and this is assured by the add_packet_locked() caller.
* demux: move a functionwm42019-09-191-14/+12
| | | | | | The new location makes equally much sense (or more, since it's close to its per-stream companion function), and we don't need a forward declaration.
* demux: disable backward demuxing if it fatally failswm42019-09-191-0/+13
| | | | | | | | | | | | | | We don't care much about this case, because backward playback can fail terribly without a good way to detect it, so this was fine. However, this froze in certain situations. Reading from a subtitle file for which backward demuxing failed could make it get stuck in demux_read_packet_async() in unthreaded mode. (That we don't support backwards subtitle decoding anyway doesn't matter for this.) So aggressively disable backward demuxing to prevent worse in these situations. The behavior will still be awful, because the frontend is still in backwards playback mode, but at least it won't freeze.
* demux: add a on-disk cachewm42019-09-196-39/+453
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Somewhat similar to the old --cache-file, except for the demuxer cache. Instead of keeping packet data in memory, it's written to disk and read back when needed. The idea is to reduce main memory usage, while allowing fast seeking in large cached network streams (especially live streams). Keeping the packet metadata on disk would be rather hard (would use mmap or so, or rewrite the entire demux.c packet queue handling), and since it's relatively small, just keep it in memory. Also for simplicity, the disk cache is append-only. If you're watching really long livestreams, and need pruning, you're probably out of luck. This still could be improved by trying to free unused blocks with fallocate(), but since we're writing multiple streams in an interleaved manner, this is slightly hard. Some rather gross ugliness in packet.h: we want to store the file position of the cached data somewhere, but on 32 bit architectures, we don't have any usable 64 bit members for this, just the buf/len fields, which add up to 64 bit - so the shitty union aliases this memory. Error paths untested. Side data (the complicated part of trying to serialize ffmpeg packets) untested. Stream recording had to be adjusted. Some minor details change due to this, but probably nothing important. The change in attempt_range_joining() is because packets in cache have no valid len field. It was a useful check (heuristically finding broken cases), but not a necessary one. Various other approaches were tried. It would be interesting to list them and to mention the pros and cons, but I don't feel like it.
* demux: move comment to slightly better locationwm42019-09-191-1/+1
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* demux: fix excessive backwards seeking with backwards playbackwm42019-09-191-1/+2
| | | | | | | | | | | | | | | | Backwards demuxing usually seeks back back by a "random" amount (set by a user option) when it needs new preceding packets. It turns out a past change made these backwards seek amounts add up when it didn't need to (i.e. subtracting the amount from the seek pos without properly resetting it), which could possibly slow down playback as it went on. The reason for this was that back_seek_pos was set for every stream on every seek. This made the reset not affect other streams (in particular streams which weren't used and never were reset, or which didn't reset that often). But as the commit adding it showed, this is needed only to set the initial position. So do that. Fixes: "demux: fix initial backward demuxing state in some cases"
* demux: fix minor seek_preroll consistency issuewm42019-09-191-0/+2
| | | | | | | | | When packet appending sets the start of the range, it adjusts the range by seek_preroll. Do this when packets are pruned from the start of the range too. (Yeah, seek_preroll handling is probably broken in some other cases. It was halfhearted to begin with.)
* demux: mess with seek range updates and pruningwm42019-09-193-118/+156
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The main thing this commit does is removing demux_packet.kf_seek_pts. It gets rid of 8 bytes per packet. Which doesn't matter, but whatever. This field was involved with much of seek range updating and pruning, because it tracked the canonical seek PTS (i.e. start PTS) of a packet range. We have to deal with timestamp reordering, and assume the start PTS is the lowest PTS across all packets (not necessarily just the first packet). So knowing this PTS requires looping over all packets of a range (no, the demuxer isn't going to tell us, that would be too sane). Having this as packet field was perfectly fine. I'm just removing it because I started hating extra packet fields recently. Before this commit, this value was cached in the kf_seek_pts field (and computed "incrementally" when adding packets). This commit computes the value on demand (compute_keyframe_times()) by iterating over the placket list. There is some similarity with the state before 10d0963d851fa, where I introduced the kf_seek_pts field - maybe I'm just moving in circles. The commit message claims something about quadratic complexity, but if the code before that had this problem, this new commit doesn't reintroduce it, at least. (See below.) The pruning logic is simplified (I think?) - there is no "incremental" cached pruning decision anymore (next_prune_target is removed), and instead it simply prunes until the next keyframe like it's supposed to. I think this incremental stuff was only there because of very old code that got refactored away before. I don't even know what I was thinking there, it just seems complex. Now the seek range is updated when a keyframe packet is removed. Instead of using the kf_seek_pts field, queue->seek_start is used to determine the stream with the lowest timestamp, which should be pruned first. This is different, but should work well. Doing the same as the previous code would require compute_keyframe_times(), which would introduce quadratic complexity. On the other hand, it's fine to call compute_keyframe_times() when the seek range is recomputed on pruning, because this is called only once per removed keyframe packet. Effectively, this will iterate over the packet list twice instead of once, and with some locality. The same happens when packets are appended - it loops over the recently added packets once again. (And not more often, which would go above linear complexity.) This introduces some "cleverness" with avoiding calling update_seek_ranges() even when keyframe packets added/removed, which is not really tightly coupled to the new code, and could have been in a separate commit. Removing next_prune_target achieves the same as commit b275232141f56, which is hereby reverted (stale is_bof flags prevent seeking before the current range, even if the beginning of the file was pruned). The seek range is now strictly computed after at least one packet was removed, and stale state should not be possible anymore. Range joining may over-allocate the index a little. It tried hard to avoid this before by explicitly freeing the old index before creating a new one. Now it iterates over the old index while adding the entries to the new one, which is simpler, but may allocate twice the memory in the worst case. It's not going to matter for anything, though. Seeking will be slightly slower. It needs to compute the seek PTS values across all packets in the vicinity of the seek target. The previous code also iterated over these packets, but now it iterates one packet range more. Another minor detail is that the special seeking code for SEEK_FORWARD goes away. The seeking code will now iterate over the very last packet range too, even if it's incomplete (i.e. packets are still being appended to it). It's fine that it touches the incomplete range, because the seek_end fields prevent that anything particularly incorrect can happen. On the other hand, SEEK_FORWARD can now consider this as seek target, which the deleted code had to do explicitly, as kf_seek_pts was unset for incomplete packet ranges.
* demux: fix a commentwm42019-09-191-1/+1
| | | | | | | | | Obviously doesn't sense with this order. The git history shows that this comment was touched multiple times, without ever fixing it. It was originally added in 2016, where the "for" was missing. Later, the "for" was added, but to the wrong position. What the fuck?
* demux: cache a valuewm42019-09-191-10/+9
| | | | | Just for readability purposes. Although the field is mutable, it never changes within the function.
* demux: redo timed metadatawm42019-09-195-194/+200
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The old implementation didn't work for the OGG case. Discard the old shit code (instead of fixing it), and write new shit code. The old code was already over a year old, so it's about time to rewrite it for no reason anyway. While it's true that the old code appears to be broken, the main reason to rewrite this is to make it simpler. While the amount of code seems to be about the same, both the concept and the actual tag handling are simpler. The result is probably a bit more correct. The packet struct shrinks by 8 byte. That fact that it wasted 8 bytes per packet for a rather obscure use case was the reason I started this at all (and when I found that OGG updates didn't work). While these 8 bytes aren't going to hurt, the packet struct was getting too bloated. If you buffer a lot of data, these extra fields will add up. Still quite some effort for 8 bytes. Fortunately, it's not like there are any managers that need to be convinced whether it's worth doing. The freedom to waste time on dumb shit. The old implementation attached the current metadata to each packet. When the decoder read the packet, the packet's metadata was made current. The new implementation stores metadata as separate list, and requires that the player frontend tells it the current playback time, which will be used to find the currently valid metadata. In both cases, the objective was to correctly update metadata even if a lot of data is buffered ahead (and to update them correctly when seeking within the demuxer cache). The new implementation is actually slightly more correct, because it uses the playback time for the metadata lookup. Consider if you have an audio filter which buffers 15 seconds (unfortunately such a filter exists), then the old code would update the current title 15 seconds too early, while the new one does it correctly. The new code also simplifies mixing the 3 metadata sources (global, per stream, ICY). We assume these aren't mixed in a meaningful way. The old code tried to be a bit more "exact". I didn't bother to look how the old code did this, but the new code simply always "merges" with the previous metadata, so if a newer tag removes a field, it's going to stick around anyway. I tried to keep it simple. Other approaches include making metadata a special sh_stream with metadata packets. This would have been conceptually clean, but the implementation would probably have been unnatural (and doesn't match well with libavformat's API anyway). It would have been nice to make the metadata updates chapter points (makes a lot of sense for the intended use case, web radio current song information), but I don't think it would have been a good idea to make chapters suddenly so dynamic. (Still an idea to keep in mind; the new code actually makes it easier to work towards this.) You could mention how subtitles are timed metadata, and actually are implemented as sparse packet streams in some formats. mp4 implements chapters as special subtitle stream, AFAIK. (Ironically, this is very not-ideal for files. It would be useful for streaming like web radio, but mp4 is extremely bad for streaming by design for other reasons.) bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla bla
* demux_lavf: compensate timestamp resets for OGG web radio streamswm42019-09-191-5/+58
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | Some OGG web radio streams use timestamp resets when a new song starts (you can find those Xiph's directory - other streams there don't show this behavior). Basically, the OGG stream behaves like concatenated OGG files, and "of course" the timestamps will start at 0 again when the song changes. This is very inconvenient, and breaks the seekable demuxer cache. In fact, any kind of seeking will break This is more time wasted in Xiph's bullshit. No, having timestamp resets by design is not reasonable, and fuck you. I much prefer the awful ICY/mp3 streaming mess, even if that's lower quality and awful. Maybe it wouldn't be so bad if libavformat could tell us WHERE THE FUCK THE RESET HAPPENS. But it doesn't, and the randomly changing timestamps is the only thing we get from its API. At this point, demux_lavf.c is like 90% hacks. But well, if libavformat applies this strange mixture of being clever for us vs. giving us unfiltered garbage (while pretending it abstracts everything, and hiding _useful_ implementation/low level details), not much we can do. This timestamp linearizing would, in general, probably be better done after the decoder, because then we wouldn't need to deal with timestamp resets. But the main purpose of this change is to fix seeking within the demuxer cache, so we have to do it on the lowest level. This can probably be applied to other containers and video streams too. But that is untested. Some further caveats are explained in the manpage.
* demux_lavf: add per-stream statewm42019-09-191-8/+17
| | | | Seems like this will be useful later.
* demux_lavf: use common mpv/ffmpeg timestamp conversion functionwm42019-09-191-4/+2
| | | | | | | Probably doesn't change anything, other than looking slightly better. In theory, the common function has some stuff that makes it more likely that timestamps round-trip through conversions properly, but I didn't confirm that.
* demux: refactor cache range init/deinitwm42019-09-193-59/+51
| | | | | | | | | | | | | | | | | | | | Remove the duplicated creation of the first range. Explicitly destroy ranges, including the last one on final deinit. It looks like this also fixes a leak of removed range structs, which was never noticed because they're so small, and were freed on final deinit due to having the demuxer as talloc parent. This improves upon the previous commit too (that change should have been part of it I guess). Sub-demuxers (demux_timeline only) now automatically don't use the cache (like it was intended by the previous commit). The cache is "initialized" (or disabled) last in the recursive call chain, which is messy, but this sub demuxer stuff FUCKING SUCKS, as mentioned in the previous commit message. This would be no problem if the caching layer and actual demuxer implementations were separate. Most of this change has no purpose. Might make (de-)initialization of further cache exerpiments simpler.
* demux: really disable cache for sub-demuxerswm42019-09-192-5/+11
| | | | | | | | | | | | | | | | | | 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.
* demux: handle accounting for index size differentlywm42019-09-191-16/+25
| | | | | | | | | | | | | | | | | | | | | | | | The demuxer cache tries to track the number of bytes allocated for the cache. In addition to the packet queue, the seek index is another data structure that roughly depends on the amount of packets cached. So the index size should somehow be part of the total number of bytes tracking. Until now, this was handled with KF_SEEK_ENTRY_WORST_CASE, basically a shitty heuristic. It was a guess (and probably rather an upper bound than a lower bound). The implementation details made it annoying, and it was conceptually inaccurate too. Change this, and instead simply add the index size to the total cache size. This essentially makes it part of the backbuffer. It's nice that this cleanly decouples it from the packet size tracking itself. Since it's part of the backbuffer number of bytes now, packet pruning can't necessarily free enough space in the backbuffer anymore. Before this commit, the backbuffer consisted of packets only, so it was possible to reduce its size to 0 by pruning all packets until the decoder reader position, at which point a packet was accounted as forward buffered. Now the index is added to this, and it can't be pruned. Replace the assert() because of this changed invariant.
* packet: change len field from int to size_twm42019-09-192-2/+2
| | | | | Why not. struct demux_packet doesn't change on 64 bit size due to alignment padding.
* demux: fix assertion when switching tracks during backward playbackwm42019-09-191-20/+20
| | | | | | | | | | | | | | Someone who rams a knife into his own hand just to see what happens is normally put in a psychiatric ward. But in software, this is acceptable behavior. Programs are not supposed to crash just because a user did something unreasonably dumb. Switching tracks during backward playback is such a thing. It triggered an assertion because the newly enabled stream was not properly initialized for backward playback. Fix this, and make it actually work (mostly; it still takes a "while" until playback recovers fully). This actually makes some aspects of initialization slightly cleaner.
* demux: use binary search for cache seek indexwm42019-09-191-7/+28
| | | | | | | | | | | | | Not sure if this is bug-free. You _always_ make bugs when writing a binary search from scratch (and such is the curse of C, though if I did this in C++ it would probably end in blood). It seems to work though, checking against the normal linear search. It's slightly faster. Not much. I wonder if the termination condition can be written in a nicer/elegant way. I guess the fact that it's not a == predicate makes this slightly messier?
* demux: create full seek index for cached packetswm42019-09-191-26/+72
| | | | | | | | | | | | | | | | | | | | | <