( has_target = false
) ]public delegate FlowReturn PadChainFunction
pad, owned Buffer
A function that will be called on sinkpads when chaining buffers.
The function typically processes the data contained in the buffer and either consumes the data or passes it on to the internally linked
The implementer of this function receives a refcount to
buffer and should
unref when the buffer is no longer needed.
When a chain function detects an error in the data stream, it must post an error on the bus and return an appropriate
||the sink Pad that performed the chain.
||the Buffer that is chained, not