虚拟MIDI输出在Xcode 12和iOS 14的AudioKit 5上不起作用

分类：编程问答

如何解决虚拟MIDI输出在Xcode 12和iOS 14的AudioKit 5上不起作用

我正在将Xcode 12 beta 6与AudioKit的v5-master分支一起使用。

此代码可发送MIDI数据：

    var midi = AKMIDI()
    midi.openOutput()
    midi.sendControllerMessage(MIDIByte(10),value: MIDIByte(64),channel: MIDIChannel(1))

但是我需要创建一个虚拟MIDI输出，如下所示：

    var midi = AKMIDI()
    midi.createVirtualOutputPort(name: "Virtual out")
    midi.openOutput()
    midi.sendControllerMessage(MIDIByte(10),channel: MIDIChannel(1))

一旦我添加行midi.createVirtualOutputPort(name: "Virtual out")，就会导致下一个错误：

Undefined symbols for architecture arm64:
  "vtable for __cxxabiv1::__vmi_class_type_info",referenced from:
      typeinfo for AKOperationGeneratorDSPKernel in AudioKit(AKOperationGeneratorAudioUnit.o)
  NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
  "vtable for __cxxabiv1::__si_class_type_info",referenced from:
      typeinfo for AKDSPKernel in AudioKit(AKOperationGeneratorAudioUnit.o)
      typeinfo for AKSoundpipeKernel in AudioKit(AKOperationGeneratorAudioUnit.o)
  NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
  "___cxa_pure_virtual",referenced from:
      vtable for AKDSPBase in AudioKit(AKDSPBase.o)
      vtable for AKSoundpipeKernel in AudioKit(AKOperationGeneratorAudioUnit.o)
      vtable for AKDSPKernel in AudioKit(AKDSPKernel.o)
  "___cxa_allocate_exception",referenced from:
      std::__1::__throw_length_error(char const*) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      std::__1::__throw_length_error(char const*) in AudioKit(AKDSPBase.o)
      std::__1::__throw_length_error(char const*) in AudioKit(AKOperationGeneratorAudioUnit.o)
  "std::length_error::~length_error()",referenced from:
      std::__1::__throw_length_error(char const*) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      std::__1::__throw_length_error(char const*) in AudioKit(AKDSPBase.o)
      std::__1::__throw_length_error(char const*) in AudioKit(AKOperationGeneratorAudioUnit.o)
  "typeinfo for std::length_error",referenced from:
      std::__1::__throw_length_error(char const*) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      std::__1::__throw_length_error(char const*) in AudioKit(AKDSPBase.o)
      std::__1::__throw_length_error(char const*) in AudioKit(AKOperationGeneratorAudioUnit.o)
  "___cxa_throw",referenced from:
      std::__1::__throw_length_error(char const*) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      std::__1::__throw_length_error(char const*) in AudioKit(AKDSPBase.o)
      std::__1::__throw_length_error(char const*) in AudioKit(AKOperationGeneratorAudioUnit.o)
  "___cxa_free_exception",referenced from:
      std::__1::__throw_length_error(char const*) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      std::__1::__throw_length_error(char const*) in AudioKit(AKDSPBase.o)
      std::__1::__throw_length_error(char const*) in AudioKit(AKOperationGeneratorAudioUnit.o)
  "std::logic_error::logic_error(char const*)",referenced from:
      std::length_error::length_error(char const*) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      std::length_error::length_error(char const*) in AudioKit(AKDSPBase.o)
      std::length_error::length_error(char const*) in AudioKit(AKOperationGeneratorAudioUnit.o)
  "operator new(unsigned long)",referenced from:
      _createAKParameterAutomation in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      ____ZN27AKParameterAutomationHelper23automationObserverBlockEv_block_invoke in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      AKParameterAutomationHelper::reconcileRecordedSegments() in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      std::__1::enable_if<(__is_cpp17_forward_iterator<AKParameterAutomationPoint const*>::value) && (is_constructible<AKParameterAutomationPoint,std::__1::iterator_traits<AKParameterAutomationPoint const*>::reference>::value),std::__1::__wrap_iter<AKParameterAutomationPoint*> >::type std::__1::vector<AKParameterAutomationPoint,std::__1::allocator<AKParameterAutomationPoint> >::insert<AKParameterAutomationPoint const*>(std::__1::__wrap_iter<AKParameterAutomationPoint const*>,AKParameterAutomationPoint const*,AKParameterAutomationPoint const*) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      std::__1::list<std::__1::pair<float,double>,std::__1::allocator<std::__1::pair<float,double> > >::list(std::__1::list<std::__1::pair<float,double> > > const&) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      std::__1::pair<std::__1::__tree_iterator<std::__1::__value_type<unsigned long long,AKParameterAutomationHelper::ParameterData>,std::__1::__tree_node<std::__1::__value_type<unsigned long long,void*>*,long>,bool> std::__1::__tree<std::__1::__value_type<unsigned long long,std::__1::__map_value_compare<unsigned long long,std::__1::__value_type<unsigned long long,std::__1::less<unsigned long long>,true>,std::__1::allocator<std::__1::__value_type<unsigned long long,AKParameterAutomationHelper::ParameterData> > >::__emplace_unique_key_args<unsigned long long,std::__1::piecewise_construct_t const&,std::__1::tuple<unsigned long long const&>,std::__1::tuple<> >(unsigned long long const&,std::__1::tuple<unsigned long long const&>&&,std::__1::tuple<>&&) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      std::__1::__split_buffer<AKParameterAutomationHelper::ParameterData::RecordedSegment,std::__1::allocator<AKParameterAutomationHelper::ParameterData::RecordedSegment>&>::__split_buffer(unsigned long,unsigned long,std::__1::allocator<AKParameterAutomationHelper::ParameterData::RecordedSegment>&) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      ...
  "std::__1::mutex::try_lock()",referenced from:
      ____ZN27AKParameterAutomationHelper19renderObserverBlockEv_block_invoke in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
  "___cxa_begin_catch",referenced from:
      ___clang_call_terminate in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
  "vtable for __cxxabiv1::__class_type_info",referenced from:
      typeinfo for AKDSPBase in AudioKit(AKDSPBase.o)
      typeinfo for DSPKernel in AudioKit(AKOperationGeneratorAudioUnit.o)
      typeinfo for AKOutputBuffered in AudioKit(AKOperationGeneratorAudioUnit.o)
  NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
  "std::__1::__vector_base_common<true>::__throw_length_error() const",referenced from:
      ____ZN27AKParameterAutomationHelper23automationObserverBlockEv_block_invoke in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      AKParameterAutomationHelper::reconcileRecordedSegments() in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      std::__1::enable_if<(__is_cpp17_forward_iterator<AKParameterAutomationPoint const*>::value) && (is_constructible<AKParameterAutomationPoint,AKParameterAutomationPoint const*) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      std::__1::enable_if<(__is_cpp17_forward_iterator<AKParameterAutomationPoint const*>::value) && (is_constructible<AKParameterAutomationPoint,void>::type std::__1::vector<AKParameterAutomationPoint,std::__1::allocator<AKParameterAutomationPoint> >::assign<AKParameterAutomationPoint const*>(AKParameterAutomationPoint const*,AKParameterAutomationPoint const*) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      std::__1::vector<AKParameterAutomationPoint,std::__1::allocator<AKParameterAutomationPoint> >::__vallocate(unsigned long) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      std::__1::vector<AKAutomationEvent,std::__1::allocator<AKAutomationEvent> >::__vallocate(unsigned long) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      std::__1::vector<AudioBufferList*,std::__1::allocator<AudioBufferList*> >::__vallocate(unsigned long) in AudioKit(AKDSPBase.o)
      ...
  "std::terminate()",referenced from:
      ___clang_call_terminate in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
  "std::__1::mutex::lock()",referenced from:
      AKParameterAutomationHelper::play(AVAudioTime const*,double) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      AKParameterAutomationHelper::stop() in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      AKParameterAutomationHelper::enableRecording(unsigned long long) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      AKParameterAutomationHelper::disableRecording(unsigned long long) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      AKParameterAutomationHelper::addPoints(unsigned long long,unsigned long) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      AKParameterAutomationHelper::setPoints(unsigned long long,unsigned long) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      AKParameterAutomationHelper::clearRange(unsigned long long,double,double) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      ...
  "std::__1::mutex::unlock()",double) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      ...
  "std::__1::mutex::~mutex()",referenced from:
      _deleteAKParameterAutomation in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
  "vtable for std::length_error",referenced from:
      std::length_error::length_error(char const*) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      std::length_error::length_error(char const*) in AudioKit(AKDSPBase.o)
      std::length_error::length_error(char const*) in AudioKit(AKOperationGeneratorAudioUnit.o)
  NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.
  "operator delete(void*)",referenced from:
      _deleteAKParameterAutomation in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      AKParameterAutomationHelper::reconcileRecordedSegments() in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      std::__1::enable_if<(__is_cpp17_forward_iterator<AKParameterAutomationPoint const*>::value) && (is_constructible<AKParameterAutomationPoint,AKParameterAutomationPoint const*) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      _AKParameterAutomationGetRenderObserver in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      ___destroy_helper_block_ea8_32s40r72c59_ZTSNSt3__16vectorI17AKAutomationEventNS_9allocatorIS1_EEEE in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      std::__1::__tree<std::__1::__value_type<unsigned long long,AKParameterAutomationHelper::ParameterData> > >::destroy(std::__1::__tree_node<std::__1::__value_type<unsigned long long,void*>*) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      ...
  "___gxx_personality_v0",referenced from:
      _createAKParameterAutomation in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      AKParameterAutomationHelper::play(AVAudioTime const*,unsigned long) in AudioKit(AKParameterAutomation-e7cbeb9f2f297ebe0ad57bddadf7449b377f8b2566468df168fd440392e50064.o)
      ...
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation) in

这在AudioKit 4.X，Xcode 11和iOS 13上运行良好。

关于如何进行的任何想法？看起来像是一些奇怪的c ++链接问题。

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