I am trying to save the buffer from my installTap to a file. I do it in chunks of 10 so I'll get a bigger file. When I try to play the written file (from the simulator's directory) QuickTime says that it's not compatible.
I have examined the bad m4a file and a working one. There are a lot of zero's in the bad file at the beginning followed by a lot of data. However both files appears to have the same header.
A lot of people mention that I have to nil the AudioFile, but:
audioFile = nil
is not a valid syntax, nor can I file a close method in AudioFile.
Here's the complete code, edited into one working file:
import UIKit
import AVFoundation
class ViewController: UIViewController {
let audioEngine = AVAudioEngine()
var audioFile = AVAudioFile()
var x = 0
override func viewDidLoad() {
super.viewDidLoad()
record()
// Do any additional setup after loading the view.
}
func makeFile(format: AVAudioFormat) {
let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first
do {
_ = try FileManager.default.contentsOfDirectory(at: paths!, includingPropertiesForKeys: nil)
} catch { print ("error")}
let destinationPath = paths!.appendingPathComponent("audioT.m4a")
print ("\(destinationPath)")
do {
audioFile = try AVAudioFile(forWriting: destinationPath,
settings: format.settings)
print ("file created")
} catch { print ("error creating file")}
}
func record(){
let node = audioEngine.inputNode
let recordingFormat = node.inputFormat(forBus: 0)
makeFile(format: recordingFormat)
node.installTap(onBus: 0, bufferSize: 8192, format: recordingFormat, block: { [self]
(buffer, _) in
do {
try audioFile.write(from: buffer);
print ("buffer filled");
x += 1;
print("wrote \(x)")
if x > 9 {
endThis()
}
} catch {return};})
audioEngine.prepare()
do {
try audioEngine.start()
} catch let error {
print ("oh catch")
}
}
func endThis(){
audioEngine.stop()
audioEngine.inputNode.removeTap(onBus: 0)
}
}
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Xcode updated yesterday, and am now at
Xcode Version 13.3 (13E113)
Since then, whenever I debug my app the the simulator, I get the message below. Am curious if I should be concerned.
If it makes a difference: Yes, I have an IBM keyboard attached via USB.
Also this does not happen when I debug the app on the iPhone itself.
2022-03-15 14:50:45.745237-0400 Hello World[48883:648134] [HardwareKeyboard] -[UIApplication getKeyboardDevicePropertiesForSenderID:shouldUpdate:usingSyntheticEvent:], failed to fetch device property for senderID (778835616971358211) use primary keyboard info instead.