Ios 音频节点敲击麦克风,仅当内部有self.function时才会重复调用
我正在创建一个FFT频谱显示,它一遍又一遍地打印Ios 音频节点敲击麦克风,仅当内部有self.function时才会重复调用,ios,swift,avaudioengine,Ios,Swift,Avaudioengine,我正在创建一个FFT频谱显示,它一遍又一遍地打印信号[100],但是这只有在调用闭包外的函数时才有效。为什么会这样 func beginTappingMicrophone() { let inputNode = engine.inputNode let inputFormat = inputNode.outputFormat(forBus: 0) let bufferSize = 4096 inputNode.installTap(onBus: 0, buffe
信号[100]
,但是这只有在调用闭包外的函数时才有效。为什么会这样
func beginTappingMicrophone() {
let inputNode = engine.inputNode
let inputFormat = inputNode.outputFormat(forBus: 0)
let bufferSize = 4096
inputNode.installTap(onBus: 0, bufferSize: AVAudioFrameCount(bufferSize), format: inputFormat) { (buffer, time) in
let fft = PowerSpectrum.powerSpectrum(channelDataValueArray)
self.emptyFunction()
print(signal[100])
}
}