Before preparation, and when seeking, Mp3Extractor did not handle retrying:
- synchronizedHeader was set before the header was known to be valid, which
means that after seeing one valid frame header and then failing to read, the
synchronization would be treated as complete.
- The input buffer would keep data loaded during synchronization but on the next
call to synchronize when retrying it was not returned to the mark position to
re-parse the data.
This change fixes these issues.
a9c977a79e