Message.parseStepStart

void parseStepStart(out  bool  active,  out  gst.types.Format format,  out  ulong  amount,  out  double  rate,  out  bool  flush,  out  bool  intermediate)

Extract the values from step_start message.

MT safe.

Parameters

`active`	result location for the active flag
`format`	result location for the format
`amount`	result location for the amount
`rate`	result location for the rate
`flush`	result location for the flush flag
`intermediate`	result location for the intermediate flag