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It's possible to calculate an impossibly small value that
we don't have a chance to xfade. Don't die if we can't
find the boundary to start crossfading on
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ob.xfade_time can be changed by the main process without
locking, so copy the float value into a local variable
and recheck the local variable for zero before
continuing.
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It sounds nasty and we didn't do it before the core-rewrite
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buffer_before_play is a prebuffer; always respecting it
is almost as good as having no buffer at all. So we only
respect it when we haven't played anything.
Bugs that were a side effect of this also got fixed:
The player would not stop when we got to the end of the last
song on non-repeating playlists. The playlist would
continuously show the song in the last few seconds of
playback, and never move.
Having crossfade enabled would also amplify the above effect.
So, as a side effect, crossfade now correctly handles
end-of-playlist conditions, as well. It will fade out to
silence when we're at the end of a playlist.
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This is a huge refactoring of the core mpd process. The
queueing/buffering mechanism is heavily reworked.
The player.c code has been merged into outputBuffer (the actual
ring buffering logic is handled by ringbuf.c); and decode.c
actually handles decoding stuff.
The end result is several hundreds of lines shorter, even though
we still have a lot of DEBUG statements left in there for
tracing and a lot of assertions, too.
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