[Bug 690197] alsasrc: gets stuck in infinite loop if usb audio device is disconnected while being used

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=690197
  GStreamer | gst-plugins-base | git

--- Comment #17 from Sun <sunzun7 at gmail.com> 2013-04-08 11:41:21 UTC ---
i found read() function is blocking , though device is opened in non_block mode
but when prepare_read() it make it to block and it hangs if there is no data to
be filled

so will there be any problem if i change alsasrc_prepare() to prepare read in
non_block mode ?

Patch is as below.

http://paste.kde.org/718544/

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