[Bug 785937] alsasrc timestamps is sensitive to context switches.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785937

--- Comment #5 from Göran Jönsson <goran.jonsson at axis.com> ---
Hi ,

I need it in use cases with more than one alsasrc.

There are just one audio time ( in core) but the trigger time stamp is for each
instance of alsasrc. So if the time stamps should be synchronized I need a
common 
"alsa_start_time".

To know when to set and reset alsa_start_time I need to know how many alsasrc
instances there are, that is the purpose of "number_of_alsasrc" .

To be able to trust "number_of_alsasrc" I need the "number_of_alsasrc_lock".
This in use cases when alsasrss are started and stopped pretty much at the same
time.

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