On 10/21/14, 11:08 AM, Devin Heitmueller wrote:
Sorry, I'm not convinced by that. If the device has to be controlled
exclusively, the right position is the open/close. Otherwise, the
program cannot know when it becomes inaccessible out of sudden during
its operation.
I can say that I've definitely seen cases where if you configure a
device as the "default" capture device in PulseAudio, then pulse will
continue to capture from it even if you're not actively capturing the
audio from pulse. I only spotted this because I had a USB analyzer on
the device and was dumbfounded when the ISOC packets kept arriving
even after I had closed VLC.
this seems like a feature, not a bug. PulseAudio starts streaming before
clients push any data and likewise keeps sources active even after for
some time after clients stop recording. Closing VLC in your example
doesn't immediately close the ALSA device. look for
module-suspend-on-idle in your default.pa config file.
I also agree that the open/close of the alsa device is the only way to
control exclusion.
-Pierre
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