OSStatus CAComponentDescription::Save (CFPropertyListRef *outData) const
{
CACFDictionary dict(false);
char str[5];
NumToStr (str, componentType);
if (!dict.AddString (kType, CACFString(str).GetCFString())) goto error;
NumToStr (str, componentSubType);
if (!dict.AddString (kSubType, CACFString(str).GetCFString())) goto error;
NumToStr (str, componentManufacturer);
if (!dict.AddString (kManu, CACFString(str).GetCFString())) goto error;
*outData = dict.GetDict();
return 0;
error:
dict.ShouldRelease (true);
return -1;
}
void* AppleCMIODPSampleNewPlugIn(CFAllocatorRef allocator, CFUUIDRef requestedTypeUUID)
{
if (not CFEqual(requestedTypeUUID, kCMIOHardwarePlugInTypeID))
return 0;
try
{
// Before going any further, make sure the SampleAssistant process is registerred with Mach's bootstrap service. Normally, this would be done by having an appropriately
// configured plist in /Library/LaunchDaemons, but if that is done then the process will be owned by root, thus complicating the debugging process. Therefore, in the event that the
// plist is missing (as would be the case for most debugging efforts) attempt to register the SampleAssistant now. It will fail gracefully if allready registered.
mach_port_t assistantServicePort;
name_t assistantServiceName = "com.apple.cmio.DPA.Sample";
kern_return_t err = bootstrap_look_up(bootstrap_port, assistantServiceName, &assistantServicePort);
if (BOOTSTRAP_SUCCESS != err)
{
// Create an URL to SampleAssistant that resides at "/Library/CoreMediaIO/Plug-Ins/DAL/Sample.plugin/Contents/Resources/SampleAssistant"
CACFURL assistantURL(CFURLCreateWithFileSystemPath(NULL, CFSTR("/Library/CoreMediaIO/Plug-Ins/DAL/Sample.plugin/Contents/Resources/SampleAssistant"), kCFURLPOSIXPathStyle, false));
ThrowIf(not assistantURL.IsValid(), CAException(-1), "AppleCMIODPSampleNewPlugIn: unable to create URL for the SampleAssistant");
// Get the maximum size of the of the file system representation of the SampleAssistant's absolute path
CFIndex length = CFStringGetMaximumSizeOfFileSystemRepresentation(CACFString(CFURLCopyFileSystemPath(CACFURL(CFURLCopyAbsoluteURL(assistantURL.GetCFObject())).GetCFObject(), kCFURLPOSIXPathStyle)).GetCFString());
// Get the file system representation
CAAutoFree<char> path(length);
(void) CFURLGetFileSystemRepresentation(assistantURL.GetCFObject(), true, reinterpret_cast<UInt8*>(path.get()), length);
mach_port_t assistantServerPort;
err = bootstrap_create_server(bootstrap_port, path, getuid(), true, &assistantServerPort);
ThrowIf(BOOTSTRAP_SUCCESS != err, CAException(err), "AppleCMIODPSampleNewPlugIn: couldn't create server");
err = bootstrap_check_in(assistantServerPort, assistantServiceName, &assistantServicePort);
// The server port is no longer needed so get rid of it
(void) mach_port_deallocate(mach_task_self(), assistantServerPort);
// Make sure the call to bootstrap_create_service() succeeded
ThrowIf(BOOTSTRAP_SUCCESS != err, CAException(err), "AppleCMIODPSampleNewPlugIn: couldn't create SampleAssistant service port");
}
// The service port is not longer needed so get rid of it
(void) mach_port_deallocate(mach_task_self(), assistantServicePort);
CMIO::DP::Sample::PlugIn* plugIn = new CMIO::DP::Sample::PlugIn(requestedTypeUUID);
plugIn->Retain();
return plugIn->GetInterface();
}
catch (...)
{
return NULL;
}
}
