[PATCH 1/3] quartz: Modify GetClassMediaFile to also extract the SourceFilter value

[Alessandro Pignotti]

The following patchset makes it possible to use the source filters
installed in the system, even if they are not registered for the file
extension. The problem, in the previous approach, is that the byte
patterns, which are used to detect if a filter can be used on the file,
were not being used.

The patchset fixes the issue by creating a regular AsyncReader filter,
and using it to check registered byte patterns against the file. If any
filter is found that one is created and the AsyncReader is released. If
no match is found the AsyncReader is returned as it happens now.
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