_FillNextBuffer
_FillNextBuffer(*input, input->fBuffer);
BBuffer* buffer = _FillNextBuffer(bufferInfo, *output);
void _FillNextBuffer(node_input& channel,
BBuffer* _FillNextBuffer(multi_buffer_info& info,
BBuffer* buffer = _FillNextBuffer(&abinfo, *output);
BBuffer* _FillNextBuffer(audio_buf_info* abinfo,
BBuffer* buffer = _FillNextBuffer(event->event_time);
BBuffer* _FillNextBuffer(bigtime_t eventTime);