Unlock any pending access to the resource. Subclasses should unblock
any blocked function ASAP. In particular, any create() function in
progress should be unblocked and should return GST_FLOW_FLUSHING. Any
future #GstBaseSrcClass::create function call should also return
GST_FLOW_FLUSHING until the #GstBaseSrcClass::unlock_stop function has
been called.
Unlock any pending access to the resource. Subclasses should unblock any blocked function ASAP. In particular, any create() function in progress should be unblocked and should return GST_FLOW_FLUSHING. Any future #GstBaseSrcClass::create function call should also return GST_FLOW_FLUSHING until the #GstBaseSrcClass::unlock_stop function has been called.