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This in turn enables modifying MidiDriver_MPU401::close() to allow
it to be called on a midi driver that has not yet been opened.
The specific issue that triggered me to make these changes was a
crash-upon-quit in HUGO, caused by it instantiating a midi driver,
then encountering an error (missing hugo.dat) *before* having
opened the new midi driver; the general cleanup code then tries
to close the (not yet opened) midi driver -> kaboom
Also fixed some engines which were leaking MidiDriver instances.
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Is it just me or is overwriting-but-not-marking-as-virtual
irritating?
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Tip of the day: git grep -w PI
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The ARM specific rate converters work with 8bit volume vars. Limit
volumes to 0xff to prevent crackling.
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The RateConverter::flow result was never used, pipe it through
Channel::mix to MixerImpl::mixCallback, so backends can decide
if they want to waste cpu cycles while playing empty buffers.
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This assertion was introduced with 633b8ed27784. I change the code to first
convert all parameters to the audio stream's framerate to avoid a possible use
of operator- on two AudioTimestamps with different framerates.
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svn-id: r55850
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