Drop the buffer currently queued in pad.
This checks if a pad has a buffer available that will be returned by a call to gstbase.aggregator_pad.AggregatorPad.peekBuffer or gstbase.aggregator_pad.AggregatorPad.popBuffer.
It is only valid to call this method from #GstAggregatorClass::aggregate()
Steal the ref to the buffer currently queued in pad.
Connect to BufferConsumed signal.
The default implementation of GstPad used with #GstAudioAggregator