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cocos2dx の新しい AudioEngine を使用していて、このクラッシュが発生しています: https://github.com/cocos2d/cocos2d-x/issues/18948

0   0x0000000184a5cea8 in CrashIfClientProvidedBogusAudioBufferList ()
1   0x000000018493f270 in AudioConverterConvertComplexBuffer ()
2   0x0000000184939460 in AUSpatialMixer::Render(unsigned int&, AudioTimeStamp const&, unsigned int) ()
3   0x0000000184a62a20 in AUBase::DoRenderBus(unsigned int&, AudioTimeStamp const&, unsigned int, AUOutputElement*, unsigned int, AudioBufferList&) ()
4   0x0000000184a621ac in AUBase::DoRender(unsigned int&, AudioTimeStamp const&, unsigned int, unsigned int, AudioBufferList&) ()
5   0x0000000184a6b550 in AUMethodRender(void*, unsigned int*, AudioTimeStamp const*, unsigned int, unsigned int, AudioBufferList*) ()
6   0x0000000184a5d284 in AUInputElement::PullInput(unsigned int&, AudioTimeStamp const&, unsigned int, unsigned int) ()
7   0x00000001847e8e00 in AUInputFormatConverter2::InputProc(OpaqueAudioConverter*, unsigned int*, AudioBufferList*, AudioStreamPacketDescription**, void*) ()
8   0x000000018474fdd4 in AudioConverterChain::CallInputProc(unsigned int) ()
9   0x000000018474fa64 in AudioConverterChain::FillBufferFromInputProc(unsigned int*, CABufferList*) ()
10  0x000000018472be38 in BufferedAudioConverter::GetInputBytes(unsigned int, unsigned int&, CABufferList const*&) ()
11  0x00000001849906f8 in Resampler2Wrapper::RenderOutput(CABufferList*, unsigned int, unsigned int&) ()
12  0x0000000184752a7c in SampleRateConverter::RenderOutput(CABufferList*, unsigned int, unsigned int&, AudioStreamPacketDescription*) ()
13  0x000000018472bcc8 in BufferedAudioConverter::FillBuffer(unsigned int&, AudioBufferList&, AudioStreamPacketDescription*) ()
14  0x000000018474f65c in AudioConverterChain::RenderOutput(CABufferList*, unsigned int, unsigned int&, AudioStreamPacketDescription*) ()
15  0x000000018472bcc8 in BufferedAudioConverter::FillBuffer(unsigned int&, AudioBufferList&, AudioStreamPacketDescription*) ()
16  0x000000018493ec98 in AudioConverterFillComplexBuffer ()
17  0x00000001847e864c in AUConverterBase::RenderBus(unsigned int&, AudioTimeStamp const&, unsigned int, unsigned int) ()
18  0x00000001846cd07c in AURemoteIO::RenderBus(unsigned int&, AudioTimeStamp const&, unsigned int, unsigned int) ()
19  0x0000000184a62a20 in AUBase::DoRenderBus(unsigned int&, AudioTimeStamp const&, unsigned int, AUOutputElement*, unsigned int, AudioBufferList&) ()
20  0x0000000184a621ac in AUBase::DoRender(unsigned int&, AudioTimeStamp const&, unsigned int, unsigned int, AudioBufferList&) ()
21  0x00000001846ccd28 in AURemoteIO::PerformIO(unsigned int, unsigned int, unsigned int, AudioTimeStamp const&, AudioTimeStamp const&, AudioBufferList const*, AudioBufferList*, int&) ()
22  0x00000001846ce1a0 in AURIOCallbackReceiver_PerformIO ()
23  0x0000000184860018 in _XPerformIO ()
24  0x0000000184a4a5ec in mshMIGPerform ()
25  0x0000000184a4a804 in MSHMIGDispatchMessage ()
26  0x00000001846cd4c0 in AURemoteIO::IOThread::Run() ()
27  0x00000001846d1a40 in AURemoteIO::IOThread::Entry(void*) ()
28  0x0000000184a52630 in CAPThread::Entry(CAPThread*) ()
29  0x00000001808c432c in _pthread_body ()
30  0x00000001808c41f8 in _pthread_start ()
31  0x00000001808c2c38 in thread_start ()

基本的に何が起こっているかというと、AudioEngine は AlBufferDataStatic を使用しており、読み取るデータを char* pcmData バッファー内に格納します (コードはこちらで確認できます: https://github.com/cocos2d/cocos2d-x/tree/v3/cocos /audio/apple (主要なものは AudioCache.mm と AudioDecoder.mm です))、AudioCache デストラクタ (メイン スレッドから呼び出される) 内で pcmData バッファが解放されると、AURemoteIO がポーリングしているため、競合状態が発生します。クライアントデータ（私にとってはmp3です）をpcmに変換して独自のスレッドにします。

問題は、現在解放されている pcmData バッファーが解放された瞬間に、AURemoteIO スレッドが何かを行うのを止めることができるかということです。

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