Generate SRT from audio (#341)

ios-swiftui/SherpaOnnx2Pass/SherpaOnnx2Pass/Extension.swift

@@ -18,3 +18,37 @@ extension AVAudioPCMBuffer {
         return self.audioBufferList.pointee.mBuffers.array()
     }
 }
+
+extension TimeInterval {
+  var hourMinuteSecondMS: String {
+    String(format: "%d:%02d:%02d,%03d", hour, minute, second, millisecond)
+  }
+
+  var hour: Int {
+    Int((self / 3600).truncatingRemainder(dividingBy: 3600))
+  }
+  var minute: Int {
+    Int((self / 60).truncatingRemainder(dividingBy: 60))
+  }
+  var second: Int {
+    Int(truncatingRemainder(dividingBy: 60))
+  }
+  var millisecond: Int {
+    Int((self * 1000).truncatingRemainder(dividingBy: 1000))
+  }
+}
+
+extension String {
+  var fileURL: URL {
+    return URL(fileURLWithPath: self)
+  }
+  var pathExtension: String {
+    return fileURL.pathExtension
+  }
+  var lastPathComponent: String {
+    return fileURL.lastPathComponent
+  }
+  var stringByDeletingPathExtension: String {
+    return fileURL.deletingPathExtension().path
+  }
+}