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PulseAudio: fix access to protected enums in AudioInput and AudioOutput.
The SampleFormat enums in AudioOutput and AudioInput are meant to be used in subclasses of AudioOuptut and AudioInput, and because of that, they're marked protected. PulseAudioSystem has used these protected enums for some time, without triggering any warnings. However, recent versions of Clang error out on this behavior (and rightly so). To fix this issue, this change modifies PulseAudioSystem to access the SampleFormat enums via PulseAudioOutput and PulseAudioInput, instead of going through AudioOutput and AudioInput directly. PulseAudioSystem is already a friend class of PulseAudioOutput and PulseAudioInput, so it can access the protected members of AudioOutput of AudioInput just fine, as long as it happens via PulseAudioOutput and PulseAudioInput. Originally reported on the Debian BTS (as #753273) by Alexander <email@example.com> Reported on the Mumble issue tracker (as #1302) by Chris Knadle <Chris.Knadle@coredump.us>
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