ios - 静默 X 秒后停止录音
<p><p>我正在实现以下教程:<a href="https://www.appcoda.com/siri-speech-framework/" rel="noreferrer noopener nofollow">Speech To Text</a> </p>
<p>我正在使用 AVAudioEngine 和 SFSpeechRecognizer 录制音频
实现语音到文本。此处教程使用以下方法将语音引导至文本
一个开始和停止录制的按钮。</p>
<p>当应用程序获得
允许。但是几秒钟后我找不到任何停止录制的方法
沉默。以下是我的代码:</p>
<pre><code>import UIKit
import Speech
public class ViewController: UIViewController, SFSpeechRecognizerDelegate {
// MARK: Properties
private let speechRecognizer = SFSpeechRecognizer(locale: Locale(identifier: "en-US"))!
private var recognitionRequest: SFSpeechAudioBufferRecognitionRequest?
private var recognitionTask: SFSpeechRecognitionTask?
private let audioEngine = AVAudioEngine()
@IBOutlet var textView : UILabel!
@IBOutlet var recordButton : UIButton!
public override func viewDidLoad() {
super.viewDidLoad()
recordButton.isEnabled = false
}
override public func viewDidAppear(_ animated: Bool) {
speechRecognizer.delegate = self
SFSpeechRecognizer.requestAuthorization { authStatus in
/*
The callback may not be called on the main thread. Add an
operation to the main queue to update the record button's state.
*/
OperationQueue.main.addOperation {
switch authStatus {
case .authorized:
self.recordButton.isEnabled = true
try! self.startRecording()
self.recordButton.setTitle("Stop recording", for: [])
case .denied:
self.recordButton.isEnabled = false
self.recordButton.setTitle(
"User denied access to speech recognition",
for: .disabled
)
case .restricted:
self.recordButton.isEnabled = false
self.recordButton.setTitle(
"Speech recognition restricted on this device",
for: .disabled
)
case .notDetermined:
self.recordButton.isEnabled = false
self.recordButton.setTitle(
"Speech recognition not yet authorized",
for: .disabled
)
}
}
}
}
@IBAction func recordButtonTapped() {
if audioEngine.isRunning {
audioEngine.stop()
recognitionRequest?.endAudio()
recordButton.isEnabled = false
recordButton.setTitle("Start Recording", for: [])
} else {
try! startRecording()
recordButton.setTitle("Stop recording", for: [])
}
}
private func startRecording() throws {
// Cancel the previous task if it's running.
if let recognitionTask = recognitionTask {
recognitionTask.cancel()
self.recognitionTask = nil
}
let audioSession = AVAudioSession.sharedInstance()
try audioSession.setCategory(AVAudioSessionCategoryRecord)
try audioSession.setMode(AVAudioSessionModeMeasurement)
try audioSession.setActive(true, with: .notifyOthersOnDeactivation)
recognitionRequest = SFSpeechAudioBufferRecognitionRequest()
guard let inputNode = audioEngine.inputNode else {
fatalError("Audio engine has no input node")
}
guard let recognitionRequest = recognitionRequest else {
fatalError("Unable to created a SFSpeechAudioBufferRecognitionRequest object")
}
// Configure request so that results are returned before audio
// recording is finished
recognitionRequest.shouldReportPartialResults = true
// A recognition task represents a speech recognition session.
// We keep a reference to the task so that it can be cancelled.
recognitionTask = speechRecognizer.recognitionTask(
with: recognitionRequest
) { result, error in
var isFinal = false
if let result = result {
self.textView.text = result.bestTranscription.formattedString
isFinal = result.isFinal
}
if error != nil || isFinal {
self.audioEngine.stop()
inputNode.removeTap(onBus: 0)
self.recognitionRequest = nil
self.recognitionTask = nil
self.recordButton.isEnabled = true
}
}
let recordingFormat = inputNode.outputFormat(forBus: 0)
inputNode.installTap(
onBus: 0,
bufferSize: 1024,
format: recordingFormat
) { (buffer: AVAudioPCMBuffer, when: AVAudioTime) in
self.recognitionRequest?.append(buffer)
}
audioEngine.prepare()
try audioEngine.start()
textView.text = "(Go ahead, I'm listening)"
}
// MARK: SFSpeechRecognizerDelegate
public func speechRecognizer(
_ speechRecognizer: SFSpeechRecognizer,
availabilityDidChange available: Bool
) {
if available {
recordButton.isEnabled = true
recordButton.setTitle("Start Recording", for: [])
} else {
recordButton.isEnabled = false
recordButton.setTitle("Recognition not available", for: .disabled)
}
}
// MARK: Interface Builder actions
}
</code></pre>
<p>该应用程序运行良好。但我想实现在 X 秒静音时停止音频引擎。</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>也许使用具有指定间隔的计时器，并在每次获得语音输入时失效。</p>
<p>您创建了一个始终失效的计时器，并在用户说话时在其上创建了一个新计时器。当用户停止说话时，时间结束并结束</p>
<p>示例:</p>
<pre><code>class text {
var timer:Timer?
func startRecording() { createTimer(4) }
func whileRecording() { createTimer(1) }
func createTimer(_ interval:Double) {
timer?.invalidate()
timer = Timer.scheduledTimer(withTimeInterval: interval, repeats: false) { (_) in
if self.audioEngine.isRunning {
self.stopRecording()
}
}
}
}
</code></pre></p>
<p style="font-size: 20px;">关于ios - 静默 X 秒后停止录音，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/41977314/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/41977314/
</a>
</p>
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