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@robertmryan
Last active November 6, 2023 06:46
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Export MPMediaItem to file in Documents
/// Export MPMediaItem to temporary file.
///
/// - Parameters:
/// - assetURL: The `assetURL` of the `MPMediaItem`.
/// - completionHandler: Closure to be called when the export is done. The parameters are a boolean `success`, the `URL` of the temporary file, and an optional `Error` if there was any problem. The parameters of the closure are:
///
/// - fileURL: The `URL` of the temporary file created for the exported results.
/// - error: The `Error`, if any, of the asynchronous export process.
func export(_ assetURL: URL, completionHandler: @escaping (_ fileURL: URL?, _ error: Error?) -> ()) {
let asset = AVURLAsset(url: assetURL)
guard let exporter = AVAssetExportSession(asset: asset, presetName: AVAssetExportPresetAppleM4A) else {
completionHandler(nil, ExportError.unableToCreateExporter)
return
}
let fileURL = URL(fileURLWithPath: NSTemporaryDirectory())
.appendingPathComponent(NSUUID().uuidString)
.appendingPathExtension("m4a")
exporter.outputURL = fileURL
exporter.outputFileType = "com.apple.m4a-audio"
exporter.exportAsynchronously {
if exporter.status == .completed {
completionHandler(fileURL, nil)
} else {
completionHandler(nil, exporter.error)
}
}
}
func exampleUsage(with mediaItem: MPMediaItem) {
if let assetURL = mediaItem.assetURL {
export(assetURL) { fileURL, error in
guard let fileURL = fileURL, error == nil else {
print("export failed: \(error)")
return
}
// use fileURL of temporary file here
print("\(fileURL)")
}
}
}
enum ExportError: Error {
case unableToCreateExporter
}
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