如何保护文本文件中的音频样本 --> Swift

Question

问题是如何将音频文件的音频样本保存到文本文件中。我有一个特殊的情况，我已经将样本存储在一个UnsafeMutableRawBufferPointers数组中，现在我想知道如何将它们放入文本文件中。在C++中，我会在这里使用流运算符，但我是Swift的新手，不知道如何做到这一点。

到目前为止，我的代码如下：

let Data = Array(UnsafeMutableRawBufferPointer(start:buffer.mData, count: Int(buffer.mDataByteSize))

Answer 1

。。。。你的缓冲区。。。。。

let yourBuffer = Array(UnsafeMutableRawBufferPointer(start:buffer.mData, count: Int(buffer.mDataByteSize))
let dd = Data.withUnsafeBytes(yourBuffer)
let fileName = FileManager.default.urls(for: .downloadsDirectory, in: .userDomainMask).first!.appendingPathComponent("yourFile")
let result = try? dd.write(to: fileName)

这应该创建文件"；您的文件"在您的下载目录

请告诉我。

Answer 2

您已经有了创建UnsafeMutableRawBufferPointer的代码。使用它来创建数据，并将其写入磁盘：

let buffer = UnsafeRawBufferPointer(start:buffer.mData, count: Int(buffer.mDataByteSize)
let data = Data.withUnsafeBytes(buffer)
let fileURL = //the path to which you want to save
data.write(to: fileURL, options: []

Answer 3

我避免了使用指针数组的特殊情况，从而解决了这个问题。如果其他人想将音频样本写入文本文件，这就是我通过AVAudioFile:解决问题的方法

if FileManager.default.fileExists(atPath: getFileURL().path)
{
do{
//Load Audio into Buffer and then write it down to a .txt
let file = try AVAudioFile(forReading: getFileURL())
let format = AVAudioFormat(commonFormat: .pcmFormatFloat32, sampleRate: file.fileFormat.sampleRate, channels: file.fileFormat.channelCount, interleaved: false)

guard let buf = AVAudioPCMBuffer(pcmFormat: format!, frameCapacity: AVAudioFrameCount(file.length)) else{
throw NSError()
}
try file.read(into: buf)
guard buf.floatChannelData != nil else{print("Channel Buffer was not able to be created")
throw NSError()}

let arraySize = Int(buf.frameLength)
print(arraySize, "Samples saved")
let samples = Array(UnsafeBufferPointer(start:buf.floatChannelData![0],count:arraySize))
//Array is going to be encoded and safe
let encoded = try! JSONEncoder().encode(samples)
try encoded.write(to: outputURL())
print("Textfile created.n")
}catch {print(error)}


}else {print("AudioFile is missing")}