我正在使用以下代码从iPhone 11获取44100采样率的音频采样。iPhone 11默认情况下具有48000采样率。
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)
}
我正在获取空音频数据。
您可以使用音频转换器服务将48 K Hz转换为44.1 K Hz采样频率。由于iOS / iphone平台不支持所有采样频率。
https://developer.apple.com/documentation/audiotoolbox/audio_converter_services