save cmbuffer to file in swift

To save a cmbuffer to a file in Swift, you can follow these steps:

1. Convert the cmbuffer to Data using the .data property.
2. Choose a file URL to save the data to, for example using the FileManager.default.urls(for:in:) method.
3. Call the write(to:options:) method on the data, passing in the file URL and any desired options.

Here is some example code to achieve this:

main.swift
import CoreMedia

// assuming your cmbuffer is named "buffer":
guard let data = buffer.data else {
    fatalError("Failed to convert buffer to data.")
}

// choose a file URL to save to, for example this one in the app's Documents directory:
let documentsDirectoryURL = try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
let fileURL = documentsDirectoryURL.appendingPathComponent("myBuffer.cmb")

// write the data to the file:
try! data.write(to: fileURL, options: .atomic)
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Note that the .atomic option used above overwrites the file atomically, meaning that the file is either fully written or not at all. If you don't care about atomicity, you can omit this option or use .withoutOverwriting instead.