Parse an available query, writing the format into format, and other results into the passed parameters, if the respective
parameters are non-null
| this |
a GST_QUERY_BUFFERING type query Query |
| format |
the format to set for the |
| start |
the start to set, or null |
| stop |
the stop to set, or null |
| estimated_total |
estimated total amount of download time remaining in milliseconds, or null |