[Bug 774819] alsasink: do wait in write() only if really needed

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=774819

--- Comment #5 from Jan Schmidt <thaytan at noraisin.net> ---
That behaviour makes sense to me:

With alsasink, there's the hardware ringbuffer (200ms by default, or whatever
the hardware can support), and the GStreamer ringbuffer (200ms + 1 segment by
default). The writing thread transfers buffers to ALSA as fast as it can, and
is allowed to write at 1-segment-per-segment-output-by-ALSA. If the GStreamer
ringbuffer is empty, it'll write a segment of silence - but a live stream has
to run at least 200ms late before the GStreamer ringbuffer can be empty and
cause that to happen.

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