IORegistryEntrySetCFProperty in AudioDriverPlugInStreamSetProperty

2 Jul 2003

      I have write an audio driver plugin that work correctly with Mac OS X 10.2.3, but with 10.2.6 I have the following problem.

I use a specific control in the Audio stream plugin driver to change a value in the driver (See sample code below).

In the AudioDriverPlugInStreamSetProperty, I use the IORegistryEntrySetCFProperty function that return 0xE00002BC

I think that the 0xE00002BC error code is :

#define kIOReturnError           iokit_common_err(0x2bc) // general error

Could someone explain why this error is returned with Mac OS X 10.2.6 ?

I have the same problem with Mac OS X 10.2.3 and G4 DP 1.2 Ghz, not with G4 DP 867 and G3 350.

Thanks in advance for your help,

Alain

This is a sample code of the audio driver plugin :

// ****************************************************************************

// AudioDriverPlugInStreamSetProperty

// ****************************************************************************

OSStatus

AudioDriverPlugInStreamSetProperty(	AudioDeviceID			PmDevice,

                                        io_object_t			PmIOAudioStream,

                                        const AudioTimeStamp*		PmWhen,

                                        UInt32				PmChannel,

                                        AudioDevicePropertyID		PmPropertyID,

                                        UInt32				PmPropertyDataSize,

                                        const void*			PmPropertyData)

{

    OSStatus		LcResult;

    SInt32		*LcSInt32Ptr;

    SInt32		LcSInt32;

    CFNumberRef		LcCFNumberRef;

    LcResult = kAudioHardwareUnknownPropertyError;

    switch (PmPropertyID) {

        // *******************************

        // Mpeg header

        // *******************************

        case kPropertyMpegHeader:

            LcResult	= noErr;

            LcSInt32Ptr	= (SInt32*) PmPropertyData;

            LcSInt32	= *LcSInt32Ptr;

#ifdef DEBUG_SETSTREAM

            fprintf( stdout, "%s() :     *** --> kPropertyMpegHeader : set PropertyData = 0x%0lX \n", __FUNCTION__, LcSInt32 );

            fflush(stdout);

#endif

            LcCFNumberRef = CFNumberCreate( CFAllocatorGetDefault(), kCFNumberSInt32Type, &LcSInt32 );

            LcResult = IORegistryEntrySetCFProperty(	gConnectionReferenceToControlMpegHeader,

                                                        CFSTR("IOAudioControlValue"),

                                                        LcCFNumberRef );

            CFRelease(LcCFNumberRef);

#ifdef DEBUG_SETSTREAM

            fprintf( stdout, "%s() :          IORegistryEntrySetCFProperty(0x%0X, IOAudioControlValue) LcResult = 0x%0lX %ld \n", __FUNCTION__, gConnectionReferenceToControlMpegHeader, LcResult, LcResult );

            fflush(stdout);

#endif

            break;

	default:

            break;

    }

    return LcResult;

}

Someone tell me to replace the CFNumberCreate with CFDataCreate.

I try it, and I have no error in the IORegistryEntrySetCFProperty function but the value in the IORegistry did not change.

This is a sample code of my driver :

// ****************************************************************************

// ****************************************************************************

bool myAudioEngine::initHardware(IOService *provider)

{

...

    // ******************************************

    // Create CUSTOM control : Mpeg header

    // ******************************************

    mControlMpegHeader = IOAudioLevelControl::create(    CVAL_HEADMPEG_MIN,	// Initial value

                                                CVAL_HEADMPEG_MIN,		// min value :

                                                CVAL_HEADMPEG_MAX,		// max value :

                                                CVAL_HEADMPEG_MIN,		// min dB

                                                CVAL_HEADMPEG_MAX,		// max dB

                                                0,

                                                "Mpeg header",

                                                kPropertyMpegHeaderCtrlID,	// control ID - driver-defined

                                                0,					// subType

                                                kPropertyMpegHeader );

    if (!mControlMpegHeader) {

        ERRORLOG( " IOAudioLevelControl::mControlMpegHeader() \n" );

        return;

    }

    // --------------------------------------------------------------------------

    mControlMpegHeader->setValueChangeHandler( (IOAudioControl::IntValueChangeHandler)setMpegHeaderChangeHandler, this );

    PmAudioStream->addDefaultAudioControl(mControlMpegHeader);

    mControlMpegHeader->release();

...

}

// ****************************************************************************

//	MPEG HEADER CHANGE HANDLER

// ****************************************************************************

IOReturn myAudioEngine::setMpegHeaderChangeHandler( IOService *target, IOAudioControl *mpegHeaderControl, SInt32 oldValue, SInt32 newValue)

{

    IOReturn result = kIOReturnBadArgument;

    myAudioEngine *audioEngine;

    DOUT( DBG_MESSAGE, ("     ** %s() : target = %p mpegHeaderControl = %p  \n", __FUNCTION__, target, mpegHeaderControl ));

    audioEngine = (myAudioEngine *)target;

    if (audioEngine) {

        result = audioEngine->setMpegHeaderChanged( mpegHeaderControl, oldValue, newValue);

    }

    return result;

}

// ****************************************************************************

//	MPEG HEADER CHANGED

// ****************************************************************************

IOReturn myAudioEngine::setMpegHeaderChanged( IOAudioControl *mpegHeaderControl, SInt32 oldValue, SInt32 newValue)

{

    if (mpegHeaderControl) {

        DOUT( DBG_CLOCK, ("     ** %s() : Channel %ld, MpegHeader = 0x%0lX  \n", __FUNCTION__, mpegHeaderControl->getChannelID(), newValue ));

        // Set Mpeg Header

        mMpegHeader = newValue;

    }

    return kIOReturnSuccess;

}

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IORegistryEntrySetCFProperty in AudioDriverPlugInStreamSetProperty

Alain Crétet