text: # VXT
  # Developed by Christian Visintin
  #
  # MIT License
  # Copyright (c) 2021 Christian Visintin
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  # The above copyright notice and this permission notice shall be included in all
  # copies or substantial portions of the Software.
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
  #
  
  from .audio import Audio, AudioSegment
  from typing import Optional
  
  
  class Track(Audio):
      """
      Track identifies an audio chunk taken from another `Audio`.
      The track has not a physical location and is considered to be a mutable audio entity
      """
  
      def __init__(
          self, audio: AudioSegment, index: int, name: Optional[str] = None
      ) -> None:
          super().__init__()
          self.__audio: AudioSegment = audio
          self.__index: int = index
          self.__speech: str = ""
          self.__name: Optional[str] = name
  
      @property
      def audio(self) -> AudioSegment:
          return self.__audio
  
      @property
      def slug(self) -> str:
          if self.__name:
              return self.__name
          else:
              return ""
  
      @slug.setter
      def slug(self, s: str) -> None:
          self.__name = s
  
      @property
      def speech(self) -> str:
          return self.__speech
  
      @speech.setter
      def speech(self, s: Optional[str]) -> None:
          if s:
              self.__speech = s
          else:
              self.__speech = ""
  
      @property
      def index(self) -> int:
          return self.__index
  
      @index.setter
      def index(self, i: int) -> None:
          self.__index = i
  
      def set_audio(self, audio: AudioSegment) -> None:
          self.__audio = audio
  
      def set_name(self, name: str) -> None:
          """Set new name for `Track`"""
          self.__name = name
  