Get a message from the bus, waiting up to the specified timeout.
If timeout is 0, this function behaves like gst_bus_pop(). If timeout is
GST_CLOCK_TIME_NONE, this function will block forever until a message was
posted on the bus.
The GstMessage that is on the bus after the specified timeout or NULL if the bus is empty after the timeout expired. The message is taken from the bus and needs to be unreffed with gst_message_unref() after usage. MT safe. Since 0.10.12
Get a message from the bus, waiting up to the specified timeout. If timeout is 0, this function behaves like gst_bus_pop(). If timeout is GST_CLOCK_TIME_NONE, this function will block forever until a message was posted on the bus.