CollectPads provides a default collection algorithm that will determine the oldest buffer available on all of its pads, and then delegate to a configured callback.
However, if circumstances are more complicated and/or more control is desired, this sets a callback that will be invoked instead when all the pads added to the collection have buffers queued. Evidently, this callback is not compatible with set_buffer_function callback. If this callback is set, the former will be unset.
MT safe.
| this |
the collectpads to use |
| func |
the function to set |
| user_data |
user data passed to the function |