swift - AvAudioEngine 可以播放和录音吗?
问题描述
我正在尝试使用 AVAudioEngine 播放按钮声音。但不幸的是,声音文件只播放一次。
想法是,用户点击按钮,播放声音并开始录制。用户再次点击按钮后,应播放第二个声音,指示录制会话已结束。
至此第一个声音出现,录音开始。不幸的是,不会播放第二个声音(结束声音)。
而且我发现,当我使用与录音功能相同的 AudioEngine 时,根本不会播放声音。
由于我对 AVFoundation 框架完全陌生,因此我不确定这里的问题是什么。
预先感谢。
var StartSoundEngineScene1 = AVAudioEngine()
var StartSoundNodeScene1 = AVAudioPlayerNode()
func SetupAudio(AudioEngine: AVAudioEngine, SoundNode: AVAudioPlayerNode, FileURL: URL) {
guard let AudioFile = try? AVAudioFile(forReading: FileURL) else{ return }
let AudioSession = AVAudioSession.sharedInstance()
AudioEngine.attach(SoundNode)
AudioEngine.connect(SoundNode, to: AudioEngine.mainMixerNode, format: AudioFile.processingFormat)
AudioEngine.prepare()
}
override func viewDidLoad() {
super.viewDidLoad()
SetupAudio(AudioEngine: StartSoundEngineScene1, SoundNode: StartSoundNodeScene1, FileURL: StartRecSound)
}
func ButtonSound (AudioEngine: AVAudioEngine, SoundNode: AVAudioPlayerNode, FileURL: URL){
try? AudioEngine.start()
guard let audioFile = try? AVAudioFile(forReading: FileURL) else{ return }
SoundNode.scheduleFile(audioFile, at: nil, completionHandler: nil)
SoundNode.volume = 0.16
SoundNode.play()
}
func StartRecording(){
ButtonSound(AudioEngine: StartSoundEngineScene1, SoundNode: StartSoundNodeScene1, FileURL: StartRecSound)
Timer.scheduledTimer(withTimeInterval: 0.7, repeats: false) { timer in
if audioEngine.isRunning {
audioEngine.stop()
recognitionRequest?.endAudio()
} else {
print("Rercording Started")
if let recognitionTask = self.recognitionTask {
recognitionTask.cancel()
self.recognitionTask = nil
}
self.recordedMessage = ""
let audioSession = AVAudioSession.sharedInstance()
do {
try audioSession.setCategory(AVAudioSession.Category.record)
try audioSession.setMode(AVAudioSession.Mode.measurement)
}catch {
print(error)
}
recognitionRequest = SFSpeechAudioBufferRecognitionRequest()
guard let recognitionRequest = self.recognitionRequest else {
fatalError("Unable to create a speech audio buffer")
}
recognitionRequest.shouldReportPartialResults = true
recognitionRequest.requiresOnDeviceRecognition = true
recognitionTask = speechRecognizer?.recognitionTask(with: recognitionRequest, resultHandler: { (result, error) in
var isFinal = false
if let result = result {
let sentence = result.bestTranscription.formattedString
self.recordedMessage = sentence
print (self.recordedMessage)
isFinal = result.isFinal
}
if error != nil || isFinal {
self.audioEngine.stop()
self.audioEngine.inputNode.removeTap(onBus: 0)
self.recognitionRequest = nil
self.recognitionTask = nil
self.RecordBtn.isEnabled = true
}
})
let recordingFormat = audioEngine.inputNode.outputFormat(forBus: 0)
audioEngine.inputNode.installTap(onBus: 0, bufferSize: 1024, format: recordingFormat) { (buffer, when) in
self.recognitionRequest?.append(buffer)
}
audioEngine.prepare()
do{
try audioEngine.start()
}catch {
print(error)
}
}
}
}
func StopRecording(){
if audioEngine.isRunning{
audioEngine.stop()
ButtonSound(AudioEngine: StartSoundEngineScene1, SoundNode: StartSoundNodeScene1, FileURL: StopRecSound)
recognitionRequest?.endAudio()
audioEngine.inputNode.removeTap(onBus: 0)
}
}
解决方案
您将 AVAudioSessionCategory 设置为记录。
try audioSession.setCategory(AVAudioSession.Category.record)
如果你想同时播放和录制,你应该设置这个类别playAndRecord
而且...如果您在播放或录制期间更改 AVAudioSession,则 AVAudioEngine 的配置将更改,然后它会触发 AVAudioEngineConfigurationChange 通知。
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