Audio 如何从iPhone 11或iPhone 11 Pro Max获得采样率为44100的音频

我使用以下代码从iPhone11获取44100采样率的音频样本。 iPhone11默认采样率为48000

let audioEngine = AVAudioEngine()
    let inputNode = audioEngine.inputNode
    let main = audioEngine.mainMixerNode
    let inputFormat = inputNode.inputFormat(forBus: 0)
    let outputFormat = AVAudioFormat(commonFormat: AVAudioCommonFormat.pcmFormatInt16, sampleRate: 44100, channels: 1, interleaved: true)
    audioEngine.attach(downMixer)
    audioEngine.connect(inputNode, to: downMixer, format: inputFormat)
    audioEngine.connect(downMixer, to: main, format: outputFormat)
    downMixer.installTap(onBus: 0, bufferSize: 2048, format: outputFormat) { (buffer, time) -> Void in
        print(buffer)
    }

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我得到的音频数据为空。

您可以使用音频转换器服务将48 kHz的采样频率转换为44.1 kHz。因为iOS/iphone平台不支持所有采样频率