Chapter 6, Problem 13PP

Program Plan Intro

Echo

Program plan:

• Import required header files
• Define the main class “Echo”.
  • The function “process ()” is used to processes the sound samples.
    • Calculate the delay value and store it in the variable “delay”.
    • Loop through the length of the sample sound.
      • Calculate sample values and store in the array “samples []”.
    • Loop through the samples and find the largest value.
    • Scale the values.
  • Define a method “getUnsignedInt4 ()” to get unsigned 4-byte integer from the file. Process and return the value.
  • Define a method “getUnsignedInt2 ()” to get unsigned 2-byte integer from the file. Process and return the value.
  • Define a method “getSignedInt2 ()” to get signed 2-byte integer from the file. Process and return the value.
  • Define a method putSignedInt2 ()” to write signed 2-byte integer to the file.
  • Define the “main ()” method.
    • Create an object for “JFileChooser”.
    • Print the error message if the sound file is not selected.
  • Create an object for “RandomAccessFile”.
  • Check the format type and print the error message.
  • Check the number of channels and print the error message.
  • Check the bits per sample and print the error message.
  • Read the sound data using “for” loop and store the signed 2-byte integer to the array.
  • Call the function “process ()”.
  • Loop through the data size and call the function “putSignedInt2()”.
  • Close the file.
  • Create a frame using “JFrame”.
  • Set the size of the frame.
  • Create a “JComponent”.
    • Define the function “paintComponent ()”.
      • Loop through the samples and find the largest value for scaling the displayed values.
      • Loop through the samples and draw the waves.
    • Add the frame to the component.
    • Set the visibility of the frame.
    • Get the audio clip, open it and start the sound to play.