在调用停止音频引擎功能时，音频引擎正在崩溃。
以下是我要启动的功能，也可以停止音频引擎。
public func start_record() {
if audioEngine.isRunning {
regonised_text = ""
print("audio engine running")
audioEngine.inputNode?.removeTap(onBus: 0)
audioEngine.stop()
recognitionRequest?.endAudio()
audioEngine.reset()
} else {
print("audio engine not running")
speech_reconginiser.text = ""
speech_reconginiser.result = false
startRecording()
}
}
此函数用于启动_ret_record。
public func startRecording() {
if recognitionTask != nil {
recognitionTask?.cancel()
recognitionTask = nil
}
let audioSession = AVAudioSession.sharedInstance()
do {
try audioSession.setCategory(AVAudioSessionCategoryRecord)
try audioSession.setMode(AVAudioSessionModeMeasurement)
try audioSession.setActive(true, with: .notifyOthersOnDeactivation)
} catch {
print("audioSession properties weren't set because of an error.")
}
recognitionRequest = SFSpeechAudioBufferRecognitionRequest()
guard let inputNode = audioEngine.inputNode else {
fatalError("Audio engine has no input node")
}
guard let recognitionRequest = recognitionRequest else {
fatalError("Unable to create an SFSpeechAudioBufferRecognitionRequest object")
}
recognitionRequest.shouldReportPartialResults = true
recognitionTask = speechRecognizer.recognitionTask(with: recognitionRequest, resultHandler: { (result, error) in
var isFinal = false
if result != nil {
self.speech_reconginiser.text = ""
self.regonised_text = (result?.bestTranscription.formattedString)!
// print("Final text :", self.regonised_text)
self.speech_reconginiser.result = true
self.speech_reconginiser.text = self.regonised_text
// print("Final text 1213 :",self.speech_reconginiser.text)
isFinal = (result?.isFinal)!
} else {
self.speech_reconginiser.text = ""
self.speech_reconginiser.result = false
self.speech_reconginiser.text = ""
}
if error != nil || isFinal {
self.audioEngine.stop()
inputNode.removeTap(onBus: 0)
self.recognitionRequest = nil
self.recognitionTask = nil
}
})
let recordingFormat = inputNode.outputFormat(forBus: 0)
inputNode.installTap(onBus: 0, bufferSize: 1024, format: recordingFormat) { (buffer, when) in
self.recognitionRequest?.append(buffer)
}
audioEngine.prepare()
do {
try audioEngine.start()
} catch {
print("audioEngine couldn't start because of an error.")
}
}
这是堆栈跟踪
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BREAKPOINT (code=1, subcode=0x18cd96ea8)
* frame #0: 0x000000018cd96ea8 CoreFoundation`___forwarding___ + 744
frame #1: 0x000000018cc92d4c CoreFoundation`_CF_forwarding_prep_0 + 92
frame #2: 0x000000018cc72a80 CoreFoundation`-[__NSArrayI dealloc] + 84
frame #3: 0x000000018b812134 libobjc.A.dylib`(anonymous namespace)::AutoreleasePoolPage::pop(void*) + 836
frame #4: 0x000000018cc6eb28 CoreFoundation`_CFAutoreleasePoolPop + 28
frame #5: 0x000000018cc729c0 CoreFoundation`CFRunLoopTimerInvalidate + 616
frame #6: 0x000000018cd417dc CoreFoundation`__CFRunLoopDoTimer + 908
frame #7: 0x000000018cd41068 CoreFoundation`__CFRunLoopDoTimers + 244
frame #8: 0x000000018cd3ec8c CoreFoundation`__CFRunLoopRun + 1484
frame #9: 0x000000018cc6eda4 CoreFoundation`CFRunLoopRunSpecific + 424
frame #10: 0x000000018e6d9074 GraphicsServices`GSEventRunModal + 100
frame #11: 0x0000000192f29c9c UIKit`UIApplicationMain + 208
frame #12: 0x0000000100542a2c GraspIO-Dev`main at AppDelegate.swift:22
frame #13: 0x000000018bc7d59c libdyld.dylib`start + 4
thread #4
frame #0: 0x000000018bd8da88 libsystem_kernel.dylib`__workq_kernreturn + 8
frame #1: 0x000000018be52fd0 libsystem_pthread.dylib`_pthread_wqthread + 792
frame #2: 0x000000018be52cac libsystem_pthread.dylib`start_wqthread + 4
thread #5
frame #0: 0x0000000103a80c80 libdispatch.dylib`_dispatch_introspection_thread_add + 188
frame #1: 0x0000000103a65380 libdispatch.dylib`_dispatch_worker_thread3 + 112
frame #2: 0x000000018be53100 libsystem_pthread.dylib`_pthread_wqthread + 1096
frame #3: 0x000000018be52cac libsystem_pthread.dylib`start_wqthread + 4
thread #6, name = 'com.apple.uikit.eventfetch-thread'
frame #0: 0x000000018bd6f224 libsystem_kernel.dylib`mach_msg_trap + 8
frame #1: 0x000000018bd6f09c libsystem_kernel.dylib`mach_msg + 72
frame #2: 0x000000018cd40e90 CoreFoundation`__CFRunLoopServiceMachPort + 192
frame #3: 0x000000018cd3eae4 CoreFoundation`__CFRunLoopRun + 1060
frame #4: 0x000000018cc6eda4 CoreFoundation`CFRunLoopRunSpecific + 424
frame #5: 0x000000018d789db4 Foundation`-[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 304
frame #6: 0x000000018d7aab84 Foundation`-[NSRunLoop(NSRunLoop) runUntilDate:] + 96
frame #7: 0x00000001938b3830 UIKit`-[UIEventFetcher threadMain] + 136
frame #8: 0x000000018d887318 Foundation`__NSThread__start__ + 996
frame #9: 0x000000018be5568c libsystem_pthread.dylib`_pthread_body + 240
frame #10: 0x000000018be5559c libsystem_pthread.dylib`_pthread_start + 284
frame #11: 0x000000018be52cb4 libsystem_pthread.dylib`thread_start + 4
thread #8
frame #0: 0x000000018be52ca8 libsystem_pthread.dylib`start_wqthread
thread #9
frame #0: 0x000000018bd8da88 libsystem_kernel.dylib`__workq_kernreturn + 8
frame #1: 0x000000018be52fd0 libsystem_pthread.dylib`_pthread_wqthread + 792
frame #2: 0x000000018be52cac libsystem_pthread.dylib`start_wqthread + 4
thread #10
frame #0: 0x000000018be52ca8 libsystem_pthread.dylib`start_wqthread
thread #11, name = 'com.apple.NSURLConnectionLoader'
frame #0: 0x000000018bd6f224 libsystem_kernel.dylib`mach_msg_trap + 8
frame #1: 0x000000018bd6f09c libsystem_kernel.dylib`mach_msg + 72
frame #2: 0x000000018cd40e90 CoreFoundation`__CFRunLoopServiceMachPort + 192
frame #3: 0x000000018cd3eae4 CoreFoundation`__CFRunLoopRun + 1060
frame #4: 0x000000018cc6eda4 CoreFoundation`CFRunLoopRunSpecific + 424
frame #5: 0x000000018d47bdf4 CFNetwork`+[NSURLConnection(Loader) _resourceLoadLoop:] + 404
frame #6: 0x000000018d887318 Foundation`__NSThread__start__ + 996
frame #7: 0x000000018be5568c libsystem_pthread.dylib`_pthread_body + 240
frame #8: 0x000000018be5559c libsystem_pthread.dylib`_pthread_start + 284
frame #9: 0x000000018be52cb4 libsystem_pthread.dylib`thread_start + 4
thread #12, name = 'com.apple.CFStream.LegacyThread'
frame #0: 0x000000018bd6f224 libsystem_kernel.dylib`mach_msg_trap + 8
frame #1: 0x000000018bd6f09c libsystem_kernel.dylib`mach_msg + 72
frame #2: 0x000000018cd40e90 CoreFoundation`__CFRunLoopServiceMachPort + 192
frame #3: 0x000000018cd3eae4 CoreFoundation`__CFRunLoopRun + 1060
frame #4: 0x000000018cc6eda4 CoreFoundation`CFRunLoopRunSpecific + 424
frame #5: 0x000000018cd4e794 CoreFoundation`_legacyStreamRunLoop_workThread + 268
frame #6: 0x000000018be5568c libsystem_pthread.dylib`_pthread_body + 240
frame #7: 0x000000018be5559c libsystem_pthread.dylib`_pthread_start + 284
frame #8: 0x000000018be52cb4 libsystem_pthread.dylib`thread_start + 4
thread #13, name = 'com.apple.CFSocket.private'
frame #0: 0x000000018bd8d23c libsystem_kernel.dylib`__select + 8
frame #1: 0x000000018cd47cb0 CoreFoundation`__CFSocketManager + 632
frame #2: 0x000000018be5568c libsystem_pthread.dylib`_pthread_body + 240
frame #3: 0x000000018be5559c libsystem_pthread.dylib`_pthread_start + 284
frame #4: 0x000000018be52cb4 libsystem_pthread.dylib`thread_start + 4
thread #14
frame #0: 0x000000018bd6f278 libsystem_kernel.dylib`semaphore_timedwait_trap + 8
frame #1: 0x0000000103a7f238 libdispatch.dylib`_os_semaphore_timedwait + 92
frame #2: 0x0000000103a67db8 libdispatch.dylib`_dispatch_semaphore_wait_slow + 72
frame #3: 0x0000000103a66f8c libdispatch.dylib`_dispatch_worker_thread + 272
frame #4: 0x000000018be5568c libsystem_pthread.dylib`_pthread_body + 240
frame #5: 0x000000018be5559c libsystem_pthread.dylib`_pthread_start + 284
frame #6: 0x000000018be52cb4 libsystem_pthread.dylib`thread_start + 4
thread #15, name = 'AVAudioSession Notify Thread'
frame #0: 0x000000018bd6f224 libsystem_kernel.dylib`mach_msg_trap + 8
frame #1: 0x000000018bd6f09c libsystem_kernel.dylib`mach_msg + 72
frame #2: 0x000000018cd40e90 CoreFoundation`__CFRunLoopServiceMachPort + 192
frame #3: 0x000000018cd3eae4 CoreFoundation`__CFRunLoopRun + 1060
frame #4: 0x000000018cc6eda4 CoreFoundation`CFRunLoopRunSpecific + 424
frame #5: 0x00000001a6fb54f4 AVFAudio`GenericRunLoopThread::Entry(void*) + 164
frame #6: 0x00000001a6fdb814 AVFAudio`CAPThread::Entry(CAPThread*) + 84
frame #7: 0x000000018be5568c libsystem_pthread.dylib`_pthread_body + 240
frame #8: 0x000000018be5559c libsystem_pthread.dylib`_pthread_start + 284
frame #9: 0x000000018be52cb4 libsystem_pthread.dylib`thread_start + 4
我找不到它是如何发生的，我在堆栈跨流中进行了相当的搜索，然后我发现由于 input节点，在停止音频引擎时没有获得null 。我遇到的错误是" exc_bad_access（代码= 1，地址= 0x20）"
尝试以下：
let recordingFormat = inputNode.inputFormat(forBus: 0)
inputNode.installTap(onBus: 0, bufferSize: 1024, format: recordingFormat) { (buffer, when) in
self.recognitionRequest?.append(buffer)
}
audioEngine.prepare()
do {
try audioEngine.start()
} catch {
print("audioEngine couldn't start because of an error.")
}
基本上将您的recordingFormat表格outputFormat更改为inputFormat。
此代码块（上方）还应该在您的recognitionTask块内吗？如果不确定，请尝试将代码放入该块中。