IORegistryEntrySetCFProperty in AudioDriverPlugInStreamSetProperty
IORegistryEntrySetCFProperty in AudioDriverPlugInStreamSetProperty
- Subject: IORegistryEntrySetCFProperty in AudioDriverPlugInStreamSetProperty
- From: Alain Crétet <email@hidden>
- Date: Wed, 2 Jul 2003 16:58:27 +0200
- Thread-topic: IORegistryEntrySetCFProperty in AudioDriverPlugInStreamSetProperty
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;
}
_______________________________________________
coreaudio-api mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/coreaudio-api
Do not post admin requests to the list. They will be ignored.