我使用SFSpeechRecognizer，基本上可以工作。
1.但有时会出现以下错误。而且主要是在我没有执行之前avStop()。
[实用工具] +[AFAggregator logDictationFailedWithError:] 错误域=kAFAssistantErrorDomain Code=203 "重试" UserInfo={NSLocalizedDescription=重试, NSUnderlyingError=0x1c464b880 {错误域=SiriSpeechErrorDomain Code=1 "(null)"}}
2.并且完全无法在后台工作，会产生如下错误。
[实用程序] +[AFAggregator logDictationFailedWithError:] 错误域=kAFAssistantErrorDomain 代码=1700 "(null)"
class MySpeech:NSObject{
private var iosRecognizer: SFSpeechRecognizer?
private var iosRequest: SFSpeechAudioBufferRecognitionRequest?
private var iosTask: SFSpeechRecognitionTask?
private let iosAVE = AVAudioEngine()
private let avSession = AVAudioSession.sharedInstance()
func avINIT(){
try? avSession.setCategory(AVAudioSessionCategoryPlayAndRecord, with: [.allowBluetooth])
try? avSession.setMode(AVAudioSessionModeMeasurement)
try? avSession.setActive(true, with: .notifyOthersOnDeactivation)
}
func switchHFP(){
do{
//try avSession.setActive(false)
try avSession.setCategory(AVAudioSessionCategoryPlayAndRecord, with: [.allowBluetooth])
try avSession.setActive(true, with: .notifyOthersOnDeactivation)
} catch {
debugPrint("HFP error: \(error.localizedDescription)")
}
}
func avStart(_ sLNG:NSString){
if let iosTask = iosTask {
iosTask.cancel()
self.iosTask = nil
}
iosRecognizer=SFSpeechRecognizer(locale: Locale(identifier:sLNG as String))!
iosRequest = SFSpeechAudioBufferRecognitionRequest()
guard let inputNode = iosAVE.inputNode else { fatalError("Audio engine has no input node") }
guard let recognitionRequest = iosRequest else { fatalError("Unable to created a SFSpeechAudioBufferRecognitionRequest object") }
recognitionRequest.shouldReportPartialResults = false
iosTask = iosRecognizer?.recognitionTask(with: recognitionRequest) { result, error in
if let result = result {
if result.isFinal {
self.iosAVE.stop()
inputNode.removeTap(onBus: 0)
self.iosRequest = nil
self.iosTask = nil
self.textView.text = result.bestTranscription.formattedString
}
}else if error != nil{
self.iosAVE.stop()
inputNode.removeTap(onBus: 0)
self.iosRequest = nil
self.iosTask = nil
self.textView.text = error?.localizedDescription ?? "(NULL)"
}
}
let recordingFormat = iosAVE.inputNode?.outputFormat(forBus: 0)
inputNode.installTap(onBus: 0, bufferSize: 1024, format: recordingFormat) { (buffer: AVAudioPCMBuffer, when: AVAudioTime) in
self.iosRequest?.append(buffer)
}
iosAVE.prepare()
do{
try iosAVE.start()
} catch { print("Error: Start Record") }
}
}
func avStop(){
iosTask?.finish()
iosRequest?.endAudio()
}
}