It should reduce compile time / memory usage to put quite a bit of the code
into a separate crate. I also intend to limit visibility of some things to
only within the db crate, but that's for a future change. This is the smallest
move that will compile.
The recording::Segment was constructing a segment with no frames in it, which
was causing a panic when appending a zero-length stts to the Slices. Fix this
in a couple ways:
* Slices::append should return Err rather than panic. No reason to crash the
whole program when we have trouble serving a single .mp4 request.
* recording::Segment shouldn't produce zero-frame segments
I had an assert that fired in this case, dating back to when I hadn't plumbed
Result returns through much of .mp4 construction. Now I have, so there's no
excuse in having an assert here. Change to an error return, and tweak it to
not fire in the zero-duration case.
Also fix a problem in the test harness; I hadn't finished converting it for
multi-recording tests, and it was returning the wrong recording.
Because of that, I seem to have stumbled across a related problem in which
asking for zero duration of a non-zero duration recording will return a
recording::Segment with no frames, which will cause panics because its
corresponding .mp4 slices are zero-length. I just adjusted the panic message
here; I'll follow up with changes to address that.
This is intended to support HTML5 Media Source Extensions, which I expect to
be the most practical way to make a good web UI with a proper scrub bar and
such.
This feature has had very limited testing on Chrome and Firefox, and that was
not entirely successful. More work is needed before it's usable, but this
seems like a helpful progress checkpoint.
serve_generated_bytes is >3X faster. One caveat is that the reactor thread may
stall when reading from the memory-mapped slice. Moonfire NVR is basically a
single-user program, so that may not be so bad, but we'll see.
For a one-hour recording, this is about 2 KiB, so a decent chunk of a
Raspberry Pi 2's L1 cache. Generating the Slices and searching/scanning
it should be a bit faster and pollute the cache less.
This is a pretty small optimization now when transferring a decent chunk
of the moov or mdat, but it's easy enough to do. It will be much more
noticeable if I end up interleaving the captions between each key frame.
