附加在多个摄录机上的话筒击毁了应用程序。

Question

我正在尝试创建几个ClipRecorder的实例，以便稍后在我的应用程序中触发cliprecorder.start(...)来录制一个剪辑。我有一个AKMicrophone实例，我提供给ClipRecorder。若要创建剪辑记录器，请使用下一个设置：

for _ in 0 ... 4 {
    let t = Track(microphone: microphone)
    tracks.append(t)
}

轨道：

init(microphone: Microphone) {
    self.microphone = microphone
    clipRecorder = AKClipRecorder(node: microphone.node)
}

麦克风：

class Microphone {
    private var microphone: AKMicrophone = AKMicrophone()
    private var micMixer: AKMixer!
    private var micBooster: AKBooster!

    var node: AKNode {
        return micBooster
    }

    init(){
        micMixer = AKMixer(microphone)
        micBooster = AKBooster(micMixer)
        micBooster.gain = 0.5
    }
}

第一个剪辑记录器确实是初始化的，但是在第二个( for循环中)应用程序崩溃(只使用一个附加和工作)，下面是日志：

2018-10-03 18:10:59.455441+0300 BeatmanApp[56475:2289336] [avae] AVAEInternal.h:70:_AVAE_Check: required condition is false: [AVAEGraphNode.mm:851:CreateRecordingTap: (nullptr == Tap())]
2018-10-03 18:10:59.467667+0300 BeatmanApp[56475:2289336] *** Terminating app due to uncaught exception 'com.apple.coreaudio.avfaudio', reason: 'required condition is false: nullptr == Tap()'
*** First throw call stack:
(
    0   CoreFoundation                      0x000000010953629b __exceptionPreprocess + 331
    1   libobjc.A.dylib                     0x0000000108373735 objc_exception_throw + 48
    2   CoreFoundation                      0x0000000109536022 +[NSException raise:format:arguments:] + 98
    3   AVFAudio                            0x000000010b44889c _Z19AVAE_RaiseExceptionP8NSStringz + 156
    4   AVFAudio                            0x000000010b48595b _Z11_AVAE_CheckPKciS0_S0_b + 323
    5   AVFAudio                            0x000000010b47e63c _ZN17AUGraphNodeBaseV318CreateRecordingTapEmjP13AVAudioFormatU13block_pointerFvP16AVAudioPCMBufferP11AVAudioTimeE + 116
    6   AVFAudio                            0x000000010b45c1be _ZN18AVAudioEngineGraph16InstallTapOnNodeEP11AVAudioNodemjP13AVAudioFormatU13block_pointerFvP16AVAudioPCMBufferP11AVAudioTimeE + 218
    7   AVFAudio                            0x000000010b4cd423 _ZN17AVAudioEngineImpl16InstallTapOnNodeEP11AVAudioNodemjP13AVAudioFormatU13block_pointerFvP16AVAudioPCMBufferP11AVAudioTimeE + 13
    8   AVFAudio                            0x000000010b4bd48c -[AVAudioNode installTapOnBus:bufferSize:format:block:] + 208
    9   BeatmanApp                          0x00000001068d47db $S8AudioKit14AKClipRecorderC4nodeAcA8AKOutput_p_tcfcTf4gn_n + 363
    10  BeatmanApp                          0x00000001068d0299 $S8AudioKit14AKClipRecorderC4nodeAcA8AKOutput_p_tcfC + 73
    11  BeatmanApp                          0x00000001066752b4 $S10BeatmanApp5TrackC10microphoneAcA10MicrophoneC_tcfc + 724
    12  BeatmanApp                          0x0000000106674f83 $S10BeatmanApp5TrackC10microphoneAcA10MicrophoneC_tcfC + 67
    13  BeatmanApp                          0x000000010667bbd1 $S10BeatmanApp4LoopC05setupC033_AA3A7D0867ACF3D9219815B736BA3641LLyyF + 385
    14  BeatmanApp                          0x000000010667b93c $S10BeatmanApp4LoopC9metronome10microphoneAcA9MetronomeC_AA10MicrophoneCtcfc + 1164
    15  BeatmanApp                          0x000000010667b44f $S10BeatmanApp4LoopC9metronome10microphoneAcA9MetronomeC_AA10MicrophoneCtcfC + 79
    16  BeatmanApp                          0x000000010666ece5 $S10BeatmanApp11CoordinatorCyACSo22UINavigationControllerCcfc + 325
    17  BeatmanApp                          0x000000010666eb43 $S10BeatmanApp11CoordinatorCyACSo22UINavigationControllerCcfC + 67
    18  BeatmanApp                          0x000000010665952e $S10BeatmanApp0B8DelegateC11application_29didFinishLaunchingWithOptionsSbSo13UIApplicationC_SDySo0j6LaunchI3KeyaypGSgtF + 686
    19  BeatmanApp                          0x0000000106659854 $S10BeatmanApp0B8DelegateC11application_29didFinishLaunchingWithOptionsSbSo13UIApplicationC_SDySo0j6LaunchI3KeyaypGSgtFTo + 228
    20  UIKitCore                           0x000000011338b4d7 -[UIApplication _handleDelegateCallbacksWithOptions:isSuspended:restoreState:] + 280
    21  UIKitCore                           0x000000011338cec4 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 3979
    22  UIKitCore                           0x0000000113392527 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1623
    23  UIKitCore                           0x0000000113c34e3e __111-[__UICanvasLifecycleMonitor_Compatability _scheduleFirstCommitForScene:transition:firstActivation:completion:]_block_invoke + 866
    24  UIKitCore                           0x0000000113c31403 +[_UICanvas _enqueuePostSettingUpdateTransactionBlock:] + 153
    25  UIKitCore                           0x0000000113c34a7b -[__UICanvasLifecycleMonitor_Compatability _scheduleFirstCommitForScene:transition:firstActivation:completion:] + 233
    26  UIKitCore                           0x0000000113c35435 -[__UICanvasLifecycleMonitor_Compatability activateEventsOnly:withContext:completion:] + 1085
    27  UIKitCore                           0x0000000113bf2b31 __82-[_UIApplicationCanvas _transitionLifecycleStateWithTransitionContext:completion:]_block_invoke + 795
    28  UIKitCore                           0x0000000113bf27db -[_UIApplicationCanvas _transitionLifecycleStateWithTransitionContext:completion:] + 435
    29  UIKitCore                           0x0000000113c3792c __125-[_UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:]_block_invoke + 584
    30  UIKitCore                           0x0000000113c38256 _performActionsWithDelayForTransitionContext + 100
    31  UIKitCore                           0x0000000113c3768b -[_UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:] + 221
    32  UIKitCore                           0x0000000113c30aa1 -[_UICanvas scene:didUpdateWithDiff:transitionContext:completion:] + 392
    33  UIKitCore                           0x0000000113390d46 -[UIApplication workspace:didCreateScene:withTransitionContext:completion:] + 515
    34  UIKitCore                           0x00000001133c2856 -[UIApplicationSceneClientAgent scene:didInitializeWithEvent:completion:] + 357
    35  FrontBoardServices                  0x0000000112b2adda -[FBSSceneImpl _didCreateWithTransitionContext:completion:] + 448
    36  FrontBoardServices                  0x0000000112b35f43 __56-[FBSWorkspace client:handleCreateScene:withCompletion:]_block_invoke_2 + 271
    37  FrontBoardServices                  0x0000000112b3563a __40-[FBSWorkspace _performDelegateCallOut:]_block_invoke + 53
    38  libdispatch.dylib                   0x000000010b02863e _dispatch_client_callout + 8
    39  libdispatch.dylib                   0x000000010b02bbb4 _dispatch_block_invoke_direct + 301
    40  FrontBoardServices                  0x0000000112b6a3c8 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 30
    41  FrontBoardServices                  0x0000000112b6a080 -[FBSSerialQueue _performNext] + 457
    42  FrontBoardServices                  0x0000000112b6a660 -[FBSSerialQueue _performNextFromRunLoopSource] + 45
    43  CoreFoundation                      0x0000000109499b31 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
    44  CoreFoundation                      0x00000001094993a3 __CFRunLoopDoSources0 + 243
    45  CoreFoundation                      0x0000000109493a4f __CFRunLoopRun + 1263
    46  CoreFoundation                      0x0000000109493221 CFRunLoopRunSpecific + 625
    47  GraphicsServices                    0x000000010d8101dd GSEventRunModal + 62
    48  UIKitCore                           0x0000000113394115 UIApplicationMain + 140
    49  BeatmanApp                          0x000000010665a007 main + 71
    50  libdyld.dylib                       0x000000010b09e551 start + 1
    51  ???                                 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException

这看起来像麦克风节点不能与预先初始化的剪辑录音机共享，我做错了什么？我能想到的另一种可能性是创建一个剪贴机--没有要求(因为我显然不是同时录制)--那么在录音完成并调用回叫结束后，我将丢弃录音机，将剪辑移到播放机(或剪辑播放器)中，这是正确的方向吗？

非常感谢。

Answer 1

好的，经过几个小时的调试，搜索了AudioKit的源代码等等，解决这个问题的方法只是我需要在Track中修改/添加的几行代码。

init(microphone: Microphone) {
    self.microphone = microphone
}

func record(){
    microphone.node.outputNode.removeTap(onBus: 0)
    clipRecorder = AKClipRecorder(node: microphone.node)
}

removeTap函数仅在AKClipRecorder的deinit中调用，因此，直到您不去初始化实例之前，才会将抽头分配给麦克风总线，该总线假定只分配了一个抽头(参考在这里)。我要做的就是在用我的录音机开始录音之前，手动调用这个方法来清除麦克风总线上的点击。这个所以线是关于AudioKit中其他类的密切相关的问题，对我有很大的帮助。