输入节点连接到AVAudioSinkNode时出错

问题描述

连接节点时出现错误

let sourceNode = AVAudioSinkNode { (test1,frameCount,audiobufferlist) -> Osstatus in
    print("callback",self.testInteger)
    return noErr
}
audioEngine.attach(sourceNode)
audioEngine.connect(audioEngine.inputNode,to: sourceNode,format: nil)

[aurioc] AURemoteIO.cpp：1086：初始化：失败：-10851（启用1，outf inf ）

此后，当try audioEngine.start ()

时出现错误

[avae] AVAEInternal.h：88必需条件为假：[AVAudioEngineGraph.mm:1415:Initialize：（IsFormatSampleRateAndChannelCountValid（inputHWFormat））] [avae] AVAudioEngine.mm:160引擎@ 0x2836a8940：无法初始化，错误= -10875 [avae] AVAEInternal.h：88必需条件为假：[AVAudioEngineGraph.mm:1415:Initialize：（IsFormatSampleRateAndChannelCountValid（inputHWFormat））]

我也尝试过

audioEngine.connect (audioEngine.inputNode,format: audioEngine.inputNode.inputFormat (forBus: 0))

和

audioEngine.connect (audioEngine.inputNode,format: audioEngine.inputNode.outputFormat (forBus: 0))

在这两种情况下，应用程序因错误而崩溃 “由于未捕获的异常'com.apple.coreaudio.avfaudio'而终止应用程序，原因：'所需条件为假：IsFormatSampleRateAndChannelCountValid（格式）”

解决方法

我发现问题在于必须将音频会话的类别playAndRecord

try audioSession.setCategory (.playAndRecord,mode: .spokenAudio,options: .defaultToSpeaker)

在这种情况下，此选项有效

audioEngine.connect (audioEngine.inputNode,to: sourceNode,format: audioEngine.inputNode.inputFormat (forBus: 0))