hello!
so i was thinking about using
typedef IOReturn (*DataValueChangeHandler)(OSObject *target,
IOAudioControl *audioControl, const void *oldData, UInt32
oldDataSize, const void *newData, UInt32 newDataSize);
but what worries me not knowing *how* the APPUL coreaudio api “knows” what to
get.
i mean, they are giving me carte blanche to use whatever structure i want to
perform the necessary change.
do the “getValueChanged” handlers (that we do not specify) use our
specification of the “setValueChanged” to “learn” what to do? or is this
function supposed to be used for something entirely different?
for example this is what i see in IOAudioControl.h:
virtual OSObject *getValue( )
AVAILABLE_MAC_OS_X_VERSION_10_4_AND_LATER_BUT_DEPRECATED_IN_MAC_OS_X_VERSION_10_10;
virtual SInt32 getIntValue( )
AVAILABLE_MAC_OS_X_VERSION_10_4_AND_LATER_BUT_DEPRECATED_IN_MAC_OS_X_VERSION_10_10;
virtual const void *getDataBytes( )
AVAILABLE_MAC_OS_X_VERSION_10_4_AND_LATER_BUT_DEPRECATED_IN_MAC_OS_X_VERSION_10_10;
virtual UInt32 getDataLength( )
AVAILABLE_MAC_OS_X_VERSION_10_4_AND_LATER_BUT_DEPRECATED_IN_MAC_OS_X_VERSION_10_10;
the actual source is not very helpful here either:
https://opensource.apple.com/source/IOAudioFamily/IOAudioFamily-203.3/IOAudioControl.cpp.auto.html
basically, what i’m asking is: how can the API know the kind of data i’m using
to set the change without my specification?
google comes up empty for the usage of this function. in some ways it’s very
exciting and comforting that know google is impotent for many of the questions
i’m asking here!
Thanks,
Gagan
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