AudioOutputUnitStart在iphone模拟器上运行缓慢&；装置

我负责定制voip应用程序。它依赖于CoreAudio的音频输入/输出。 我发现了一个问题——当应用程序调用AudioOutputUnitStart时——它会冻结几秒钟

    OSStatus status;

InitializeAudioSession();
AudioComponentDescription desc;
desc.componentType = kAudioUnitType_Output;
desc.componentSubType = kAudioUnitSubType_RemoteIO;
desc.componentManufacturer = kAudioUnitManufacturer_Apple;
desc.componentFlags = 0;
desc.componentFlagsMask = 0;
mVoiceUnitComponent = AudioComponentFindNext(NULL, &desc);

status = AudioComponentInstanceNew(mVoiceUnitComponent, &mVoiceUnit);
UInt32 enable = 1;
AudioUnitElement inputBus = 1, outputBus = 0;
status = AudioUnitSetProperty(mVoiceUnit, kAudioOutputUnitProperty_EnableIO, 
                                                            kAudioUnitScope_Input, inputBus, 
                                                            &enable, sizeof(enable));
status = AudioUnitSetProperty(mVoiceUnit, kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Output,
                                                            outputBus, &enable, sizeof(enable));

memset(&mStreamDesc, 0, sizeof(mStreamDesc));
mStreamDesc.mSampleRate = SPK_SAMPLE_RATE;
mStreamDesc.mFormatID = kAudioFormatLinearPCM;
mStreamDesc.mFormatFlags = kAudioFormatFlagsCanonical;
mStreamDesc.mBitsPerChannel = 16;
mStreamDesc.mChannelsPerFrame = 1;
mStreamDesc.mBytesPerFrame = 2;
mStreamDesc.mFramesPerPacket = 1;
mStreamDesc.mBytesPerPacket = 2;
status = AudioUnitSetProperty(mVoiceUnit, kAudioUnitProperty_StreamFormat, 
                                                            kAudioUnitScope_Output, 
                                                            inputBus, &mStreamDesc, sizeof(mStreamDesc));
StartAudioSession();

status = AudioUnitInitialize(mVoiceUnit);
status = AudioUnitSetProperty(mVoiceUnit, kAudioUnitProperty_StreamFormat, 
                                                            kAudioUnitScope_Input, 
                                                            outputBus, &mStreamDesc, sizeof(mStreamDesc));


AURenderCallbackStruct outputCallback;
outputCallback.inputProc = IOSAudio::OutputRenderCallback;
outputCallback.inputProcRefCon = this;
status = AudioUnitSetProperty(mVoiceUnit, kAudioUnitProperty_SetRenderCallback,
                                                            kAudioUnitScope_Input, outputBus, 
                                                            &outputCallback, sizeof(outputCallback));

AURenderCallbackStruct inputCallback;
inputCallback.inputProc = IOSAudio::InputRenderCallback;
inputCallback.inputProcRefCon = this;
status = AudioUnitSetProperty(mVoiceUnit, kAudioOutputUnitProperty_SetInputCallback, 
                                                            kAudioUnitScope_Global, inputBus, 
                                                            &inputCallback, sizeof(inputCallback));


status = AudioOutputUnitStart(mVoiceUnit);

mActive = true;

SPK_样本率为8000或32000-我对它们进行了测试

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有谁能给我一些建议吗？

我做了一些调查。 看来我错了-只有模拟器的问题。 我没有找到任何原因。 因此，我添加了变通方法-在工作线程中打开音频