CAHALAudioSystemObject.cpp

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//==================================================================================================
//  Includes
//==================================================================================================

//  Self Include
#include "CAHALAudioSystemObject.h"

//  PublicUtility Includes
#include "CAAutoDisposer.h"
#include "CAPropertyAddress.h"

//==================================================================================================
//  CAHALAudioSystemObject
//==================================================================================================

CAHALAudioSystemObject::CAHALAudioSystemObject()
:
    CAHALAudioObject(kAudioObjectSystemObject)
{
}

CAHALAudioSystemObject::~CAHALAudioSystemObject()
{
}

UInt32  CAHALAudioSystemObject::GetNumberAudioDevices() const
{
    CAPropertyAddress theAddress(kAudioHardwarePropertyDevices);
    UInt32 theAnswer = GetPropertyDataSize(theAddress, 0, NULL);
    theAnswer /= sizeof(AudioObjectID);
    return theAnswer;
}

void    CAHALAudioSystemObject::GetAudioDevices(UInt32& ioNumberAudioDevices, AudioObjectID* outAudioDevices) const
{
    CAPropertyAddress theAddress(kAudioHardwarePropertyDevices);
    UInt32 theSize = ioNumberAudioDevices * sizeof(AudioObjectID);
    GetPropertyData(theAddress, 0, NULL, theSize, outAudioDevices);
    ioNumberAudioDevices = theSize / sizeof(AudioObjectID);
}

AudioObjectID   CAHALAudioSystemObject::GetAudioDeviceAtIndex(UInt32 inIndex) const
{
    AudioObjectID theAnswer = kAudioObjectUnknown;
    UInt32 theNumberDevices = GetNumberAudioDevices();
    if((theNumberDevices > 0) && (inIndex < theNumberDevices))
    {
        CAAutoArrayDelete<AudioObjectID> theDeviceList(theNumberDevices);
        GetAudioDevices(theNumberDevices, theDeviceList);
        if((theNumberDevices > 0) && (inIndex < theNumberDevices))
        {
            theAnswer = theDeviceList[inIndex];
        }
    }
    return theAnswer;
}

AudioObjectID   CAHALAudioSystemObject::GetAudioDeviceForUID(CFStringRef inUID) const
{
    AudioObjectID theAnswer = kAudioObjectUnknown;
    AudioValueTranslation theValue = { &inUID, sizeof(CFStringRef), &theAnswer, sizeof(AudioObjectID) };
    CAPropertyAddress theAddress(kAudioHardwarePropertyDeviceForUID);
    UInt32 theSize = sizeof(AudioValueTranslation);
    GetPropertyData(theAddress, 0, NULL, theSize, &theValue);
    return theAnswer;
}

static inline AudioObjectPropertySelector   CAHALAudioSystemObject_CalculateDefaultDeviceProperySelector(bool inIsInput, bool inIsSystem)
{
    AudioObjectPropertySelector theAnswer = kAudioHardwarePropertyDefaultOutputDevice;
    if(inIsInput)
    {
        theAnswer = kAudioHardwarePropertyDefaultInputDevice;
    }
    else if(inIsSystem)
    {
        theAnswer = kAudioHardwarePropertyDefaultSystemOutputDevice;
    }
    return theAnswer;
}

AudioObjectID   CAHALAudioSystemObject::GetDefaultAudioDevice(bool inIsInput, bool inIsSystem) const
{
    AudioObjectID theAnswer = kAudioObjectUnknown;
    CAPropertyAddress theAddress(CAHALAudioSystemObject_CalculateDefaultDeviceProperySelector(inIsInput, inIsSystem));
    UInt32 theSize = sizeof(AudioObjectID);
    GetPropertyData(theAddress, 0, NULL, theSize, &theAnswer);
    return theAnswer;
}

void    CAHALAudioSystemObject::SetDefaultAudioDevice(bool inIsInput, bool inIsSystem, AudioObjectID inNewDefaultDevice)
{
    CAPropertyAddress theAddress(CAHALAudioSystemObject_CalculateDefaultDeviceProperySelector(inIsInput, inIsSystem));
    UInt32 theSize = sizeof(AudioObjectID);
    SetPropertyData(theAddress, 0, NULL, theSize, &inNewDefaultDevice);
}

AudioObjectID   CAHALAudioSystemObject::GetAudioPlugInForBundleID(CFStringRef inUID) const
{
    AudioObjectID theAnswer = kAudioObjectUnknown;
    AudioValueTranslation theValue = { &inUID, sizeof(CFStringRef), &theAnswer, sizeof(AudioObjectID) };
    CAPropertyAddress theAddress(kAudioHardwarePropertyPlugInForBundleID);
    UInt32 theSize = sizeof(AudioValueTranslation);
    GetPropertyData(theAddress, 0, NULL, theSize, &theValue);
    return theAnswer;
}