text: /*
       File: ComponentBase.cpp
   Abstract: ComponentBase.h
    Version: 1.1
   
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  */
  #include "ComponentBase.h"
  #include "CAXException.h"
  
  #if TARGET_OS_MAC || TARGET_OS_MACCATALYST
  pthread_mutex_t ComponentInitLocker::sComponentOpenMutex = PTHREAD_MUTEX_INITIALIZER;
  pthread_once_t ComponentInitLocker::sOnce = PTHREAD_ONCE_INIT;
  
  void ComponentInitLocker::InitComponentInitLocker()
  {
  	// have to do this because OS X lacks PTHREAD_MUTEX_RECURSIVE_INITIALIZER_NP
  	pthread_mutexattr_t attr;
  	pthread_mutexattr_init(&attr);
  	pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
  	pthread_mutex_init(&sComponentOpenMutex, &attr);
  	pthread_mutexattr_destroy(&attr);
  }
  
  #elif TARGET_OS_WIN32
  CAGuard	ComponentInitLocker::sComponentOpenGuard("sComponentOpenGuard");
  #endif
  
  ComponentBase::EInstanceType ComponentBase::sNewInstanceType;
  
  static OSStatus CB_GetComponentDescription (const AudioComponentInstance inInstance, AudioComponentDescription * outDesc);
  #if !CA_USE_AUDIO_PLUGIN_ONLY && !TARGET_OS_WIN32
  	static OSStatus CMgr_GetComponentDescription (const AudioComponentInstance inInstance, AudioComponentDescription * outDesc);
  #endif
  
  ComponentBase::ComponentBase(AudioComponentInstance inInstance) 
  	: mComponentInstance(inInstance), 
  	  mInstanceType(sNewInstanceType) 
  { 
  	GetComponentDescription(); 
  }
  
  ComponentBase::~ComponentBase()
  {
  }
  
  void			ComponentBase::PostConstructor()
  {
  }
  
  void			ComponentBase::PreDestructor()
  {
  }
  
  #define ACPI	((AudioComponentPlugInInstance *)self)
  #define ACImp	((ComponentBase *)&ACPI->mInstanceStorage)
  
  OSStatus ComponentBase::AP_Open(void *self, AudioUnit compInstance)
  {
  	OSStatus result = noErr;
  	try {
  		ComponentInitLocker lock;
  		
  		ComponentBase::sNewInstanceType = ComponentBase::kAudioComponentInstance;
  		ComponentBase *cb = (ComponentBase *)(*ACPI->mConstruct)(&ACPI->mInstanceStorage, compInstance);
  		cb->PostConstructor();	// allows base class to do additional initialization
  		// once the derived class is fully constructed
  		result = noErr;
  	}
  	COMPONENT_CATCH
  	if (result)
  		delete ACPI;
  	return result;
  }
  
  OSStatus ComponentBase::AP_Close(void *self)
  {
  	OSStatus result = noErr;
  	try {
  		if (ACImp) {
  			ACImp->PreDestructor();
  			(*ACPI->mDestruct)(&ACPI->mInstanceStorage);
  			free(self);
  		}
  	}
  	COMPONENT_CATCH
  	return result;
  }
  
  #if !CA_USE_AUDIO_PLUGIN_ONLY
  OSStatus		ComponentBase::Version()
  {
  	return 0x00000001;
  }
  
  OSStatus		ComponentBase::ComponentEntryDispatch(ComponentParameters *p, ComponentBase *This)
  {
  	if (This == NULL) return kAudio_ParamError;
  
  	OSStatus result = noErr;
  	
  	switch (p->what) {
  	case kComponentCloseSelect:
  		This->PreDestructor();
  		delete This;
  		break;
  	
  	case kComponentVersionSelect:
  		result = This->Version();
  		break;
  
  	case kComponentCanDoSelect:
  		switch (GetSelectorForCanDo(p)) {
  		case kComponentOpenSelect:
  		case kComponentCloseSelect:
  		case kComponentVersionSelect:
  		case kComponentCanDoSelect:
  			return 1;
  		default:
  			return 0;
  		}
  		
  	default:
  		result = badComponentSelector;
  		break;
  	}
  	return result;
  }
  
  SInt16		ComponentBase::GetSelectorForCanDo(ComponentParameters *params)
  {
  	if (params->what != kComponentCanDoSelect) return 0;
  	
  	#if TARGET_CPU_X86
  		SInt16 sel = params->params[0];
  	#elif TARGET_CPU_X86_64
  		SInt16 sel = params->params[1];
  	#elif TARGET_CPU_PPC
  		SInt16 sel = (params->params[0] >> 16);
  	#else
  		SInt16 sel = params->params[0];
  	#endif
  	
  	return sel;
  /*		
  		printf ("flags:%d, paramSize: %d, what: %d\n\t", params->flags, params->paramSize, params->what);
  		for (int i = 0; i < params->paramSize; ++i) {
  			printf ("[%d]:%d(0x%x), ", i, params->params[i], params->params[i]);
  		}
  		printf("\n\tsel:%d\n", sel);
  */
  }
  
  #endif
  
  #if CA_DO_NOT_USE_AUDIO_COMPONENT 
  static OSStatus ComponentBase_GetComponentDescription (const AudioComponentInstance & inInstance, AudioComponentDescription &outDesc);
  #endif
  
  AudioComponentDescription ComponentBase::GetComponentDescription() const
  {
  	AudioComponentDescription desc;
  	OSStatus result = 1;
  	
  	if (IsPluginObject()) {
  		ca_require_noerr(result = CB_GetComponentDescription (mComponentInstance, &desc), home);
  	}
  #if !CA_USE_AUDIO_PLUGIN_ONLY && !TARGET_OS_IPHONE
  	else {
  		ca_require_noerr(result = CMgr_GetComponentDescription (mComponentInstance, &desc), home);	
  	}
  #endif
  
  home:
  	if (result)
  		memset (&desc, 0, sizeof(AudioComponentDescription));
  	
  	return desc;
  }
  
  #if CA_USE_AUDIO_PLUGIN_ONLY
  // everything we need is there and we should be linking against it
  static OSStatus CB_GetComponentDescription (const AudioComponentInstance inInstance, AudioComponentDescription * outDesc)
  {
  	AudioComponent comp = AudioComponentInstanceGetComponent(inInstance);
  	if (comp)
  		return AudioComponentGetDescription(comp, outDesc);
  
  	return kAudio_ParamError;
  }
  
  #elif !TARGET_OS_WIN32
  // these are the direct dependencies on ComponentMgr calls that an AU
  // that is a component mgr is dependent on
  
  // these are dynamically loaded so that these calls will work on Leopard
  #include <dlfcn.h>
  
  static OSStatus CB_GetComponentDescription (const AudioComponentInstance inInstance, AudioComponentDescription * outDesc)
  {
  	typedef AudioComponent (*AudioComponentInstanceGetComponentProc) (AudioComponentInstance);
  	static AudioComponentInstanceGetComponentProc aciGCProc = NULL;
  	
  	typedef OSStatus (*AudioComponentGetDescriptionProc)(AudioComponent, AudioComponentDescription *);
  	static AudioComponentGetDescriptionProc acGDProc = NULL;
  	
  	static int doneInit = 0;
  	if (doneInit == 0) {
  		doneInit = 1;	
  		void* theImage = dlopen("/System/Library/Frameworks/AudioUnit.framework/AudioUnit", RTLD_LAZY);
  		if (theImage != NULL)
  		{
  			aciGCProc = (AudioComponentInstanceGetComponentProc)dlsym (theImage, "AudioComponentInstanceGetComponent");
  			if (aciGCProc) {
  				acGDProc = (AudioComponentGetDescriptionProc)dlsym (theImage, "AudioComponentGetDescription");
  			}
  		}
  	}
  	
  	OSStatus result = kAudio_UnimplementedError;
  	if (acGDProc && aciGCProc) {
  		AudioComponent comp = (*aciGCProc)(inInstance);
  		if (comp)
  			result = (*acGDProc)(comp, outDesc);
  	} 
  #if !CA_USE_AUDIO_PLUGIN_ONLY && !TARGET_OS_IPHONE
  	else {
  		result = CMgr_GetComponentDescription (inInstance, outDesc);
  	}
  #endif
  
  	return result;
  }
  
  #if !CA_USE_AUDIO_PLUGIN_ONLY
  // these are the direct dependencies on ComponentMgr calls that an AU
  // that is a component mgr is dependent on
  
  // these are dynamically loaded
  #if TARGET_OS_IPHONE
      #include <MobileCoreServices/MobileCoreServices.h>
      #include <AudioUnit/AudioUnit.h>
  #else
      #include <CoreServices/CoreServices.h>
  #endif
  #include <AudioUnit/AudioUnit.h>
  #include "CAXException.h"
  #include "ComponentBase.h"
  
  //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  // Component Manager
  // Used for fast dispatch with audio units
  typedef Handle (*GetComponentInstanceStorageProc)(ComponentInstance aComponentInstance);
  static GetComponentInstanceStorageProc sGetComponentInstanceStorageProc = NULL;
  
  typedef OSErr (*GetComponentInfoProc)(Component, ComponentDescription *, void*, void*, void*);
  static GetComponentInfoProc sGetComponentInfoProc = NULL;
  
  typedef void (*SetComponentInstanceStorageProc)(ComponentInstance, Handle);
  static SetComponentInstanceStorageProc sSetComponentInstanceStorageProc = NULL;
  
  //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  
  static void CSInitOnce(void* /*unused*/)
  {
  	void *theImage = dlopen("/System/Library/Frameworks/CoreServices.framework/CoreServices", RTLD_LAZY);
  	if (!theImage) return;
  
  	sGetComponentInstanceStorageProc = (GetComponentInstanceStorageProc) dlsym(theImage, "GetComponentInstanceStorage");
  	sGetComponentInfoProc = (GetComponentInfoProc)dlsym (theImage, "GetComponentInfo");
  	sSetComponentInstanceStorageProc = (SetComponentInstanceStorageProc) dlsym(theImage, "SetComponentInstanceStorage");
  }
  
  #if TARGET_OS_MAC || TARGET_OS_MACCATALYST
  
  #include <dispatch/dispatch.h>
  
  static dispatch_once_t sCSInitOnce = 0;
  
  static void CSInit ()
  {
  	dispatch_once_f(&sCSInitOnce, NULL, CSInitOnce);
  }
  
  #else 
  
  static void CSInit ()
  {
  	static int sDoCSLoad = 1;
  	if (sDoCSLoad) {
  		sDoCSLoad = 0;
  		CSInitOnce(NULL);
  	}
  }
  
  #endif
  
  OSStatus CMgr_GetComponentDescription (const AudioComponentInstance inInstance, AudioComponentDescription * outDesc)
  {
  	CSInit();
  	if (sGetComponentInfoProc)
  		return (*sGetComponentInfoProc)((Component)inInstance, (ComponentDescription*)outDesc, NULL, NULL, NULL);
  	return kAudio_UnimplementedError;
  }
  
  Handle CMgr_GetComponentInstanceStorage(ComponentInstance aComponentInstance)
  {
  	CSInit();
  	if (sGetComponentInstanceStorageProc)
  		return (*sGetComponentInstanceStorageProc)(aComponentInstance);
  	return NULL;
  }
  
  void CMgr_SetComponentInstanceStorage(ComponentInstance aComponentInstance, Handle theStorage)
  {
  	CSInit();
  	if (sSetComponentInstanceStorageProc)
  		(*sSetComponentInstanceStorageProc)(aComponentInstance, theStorage);
  }
  #endif // !CA_USE_AUDIO_PLUGIN_ONLY
  
  #else
  //#include "ComponentManagerDependenciesWin.h"
  // everything we need is there and we should be linking against it
  static OSStatus CB_GetComponentDescription (const AudioComponentInstance inInstance, AudioComponentDescription * outDesc)
  {
  	AudioComponent comp = AudioComponentInstanceGetComponent(inInstance);
  	if (comp)
  		return AudioComponentGetDescription(comp, outDesc);
  
  	return kAudio_ParamError;
  }
  
  #endif
  
  