When the client wants to seek, but the decoder has already finished
decoding the current song, the player restarts the decoder with an
initial seek at the new position. When this initial seek fails, MPD
pretends nothing has happened and plays this song from the start.
With this new flag, a restarted decoder marks the initial seek as
"essential" and fails the decoder if that seek fails.
Closes https://github.com/MusicPlayerDaemon/MPD/issues/895
Before the advent of io_uring (commit dae8da7066f42367b), this didn't
matter, because the `FileInputStream` never called this. But
`UringInputStream` is derived from `AsyncInputStream`, and needs the
handler to signal completion.
Closes https://github.com/MusicPlayerDaemon/MPD/issues/898
Passing `length+1` to `MultiByteToWideChar()` means the function may
fill the whole buffer with output data, and could theoretically
overwrite the null terminator. In practice, this will never happen,
but this way, it's slightly more correct.
Also, null-terminate after `MultiByteToWideChar()`, after we got the
real output length. Again, this would never have been a problem, but
who knows...
The WildMidi project added the pkg-config file in version 0.3.3, but
unfortunately, Debian still doesn't ship it 4 years later:
https://bugs.debian.org/916631
However, for cross-compiling, the pkg-config file is very helpful.
Fixes regression from commit db93bb996c885496 because
ParseMimeTypeParameters() assumed the items were null-terminated, but
after that commit, they were not anymore.
This is the final piece of the series to establish io_uring support on
Linux.
MPD doesn't need io_uring for its efficient bulk I/O support, but to
allow file I/O to be cancelled. This is a big problem on CIFS/NFS
mounts where processes sleep uninterruptable if the file server
disappears, deadlocking MPD.
With io_uring, a flaky NFS connection allows MPD to continue to work
(even though there are still deadlocks inside MPD which need to be
addressed).
This plugin does not yet use cancellable `open()` using
`IORING_OP_OPENAT`. This will be implemented later.
Lots of other optimization opportunities for io_uring are still
missing as well - for example the database update could benefit a lot,
but unfortunately, io_uring doesn't have `readdir()` support just yet.
