2003332927 error code when getting the channels number property of Build-in Microphone
2003332927 error code when getting the channels number property of Build-in Microphone
- Subject: 2003332927 error code when getting the channels number property of Build-in Microphone
- From: Anonymous <email@hidden>
- Date: Fri, 23 Mar 2012 18:20:24 -0500
I was trying to get the audio device channels of my Mac pro. The
build-in microphone was shown an error of 2003332927 which I think it
is kAudioHardwareUnknownPropertyError. Am I right?
The built-in Output has 2 channels, I understand it, but why Built-in
Microphone has error?
I have read and modified the code from the following URL,
"http://developer.apple.com/library/mac/#technotes/tn2112/_index.html";
Your answer is highly appreciated!
//Result
xiaofengmaclap:Debug wolfram$ ./DeviceTest
{{"DeviceID":260,"DeviceName":"Built-in
Microphone",},{"DeviceID":258,"DeviceName":"Built-in
Input",},{"DeviceID":262,"DeviceName":"Built-in Output",}}
Another test
ID:258 0
ID:260 2003332927
ID:262 2
ID:264 560227702
//Code
//"http://developer.apple.com/library/mac/#technotes/tn2112/_index.html";
int GetDesiredRenderChannelCount (AudioDeviceID deviceID)
{
OSStatus result;;
UInt32 returnValue=0 ; // return stereo by default
UInt32 outSize = sizeof(deviceID);
// kAudioHardwareUnknownPropertyError
//Get the users speaker configuration
result = AudioDeviceGetPropertyInfo(deviceID,
0,
false,
kAudioDevicePropertyPreferredChannelLayout,
&outSize,
NULL);
if (result)
{
return (result); // return default (stereo)
// printf("%d",result);
}
AudioChannelLayout *layout = NULL;
layout = (AudioChannelLayout *) calloc(1, outSize);
if (layout != NULL)
{
result = AudioDeviceGetProperty(deviceID,
0,
false,
kAudioDevicePropertyPreferredChannelLayout,
&outSize,
layout
);
if (layout->mChannelLayoutTag ==
kAudioChannelLayoutTag_UseChannelDescriptions)
{
// no channel layout tag is returned,
//so walk through the channel descriptions and count
// the channels that are associated with a speaker
if (layout->mNumberChannelDescriptions == 2)
{
returnValue = 2; // there is no channel info for stereo
}
else
{
returnValue = 0;
for (UInt32 i = 0; i < layout->mNumberChannelDescriptions; i++)
{
if (layout->mChannelDescriptions[i].mChannelLabel !=
kAudioChannelLabel_Unknown)
returnValue++;
}
}
}
else
{
switch (layout->mChannelLayoutTag)
{
case kAudioChannelLayoutTag_AudioUnit_5_0:
case kAudioChannelLayoutTag_AudioUnit_5_1:
case kAudioChannelLayoutTag_AudioUnit_6:
returnValue = 5;
break;
case kAudioChannelLayoutTag_AudioUnit_4:
returnValue = 4;
default:
returnValue = 2;
}
}
free(layout);
}
return returnValue;
//return result;
}
int main(void)
{
getDeviceInfo();
puts("Another test\n");
int num=0;
GetDesiredRenderChannelCount(258);
printf("ID:258 %d\n",num);
num=GetDesiredRenderChannelCount(260);
printf("ID:260 %d\n",num);
num=GetDesiredRenderChannelCount(262);
printf("ID:262 %d\n",num);
num=GetDesiredRenderChannelCount(264);
printf("ID:264 %d\n",num);
}
--
Xiaofeng Li
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