How to resolve the algorithm Play recorded sounds step by step in the Julia programming language

Published on 22 June 2024 08:30 PM
#Julia

How to resolve the algorithm Play recorded sounds step by step in the Julia programming language

Table of Contents

Problem Statement

Load at least two prerecorded sounds, and demonstrate as many of these features as you can: Describe: [Note: If it seems to be a good idea, this task may be revised to specify a particular timeline rather than just 'demonstrate these features'.] Where applicable, please categorize examples primarily by the audio facility used (library/API/program/platform) rather than the language if the language is incidental (e.g. "Mac OS X CoreAudio" or "mplayer" rather than "C" or "bash").

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Play recorded sounds step by step in the Julia programming language

This code is a Julia program that creates a graphical user interface (GUI) for controlling audio playback. It allows the user to select multiple sound or music files, adjust their volume, playback start and end positions, and play them in sequence or simultaneously. Here's a detailed explanation of the code:

  1. Module Imports:

    • using Distributed, Gtk, LibSndFile, MP3 imports the necessary modules for audio playback, GUI creation, and sound file handling.
    • using FileIO: load imports the load function for reading sound files.

  2. recordingplayerapp Function:

    • This function creates the main GUI and handles the playback functionality.

  3. GUI Creation:

    • A GtkWindow is created with a title, size, and a vertical GtkBox.
    • An async process playprocess is created to handle audio playback.
    • filenames is an array to store the selected file paths.
    • filedurations is an array to store the durations of the selected files.

  4. File Selection Buttons:

    • A GtkButton is created for each file selection.
    • When a file selection button is clicked, it triggers a callback that opens a file browser and allows the user to select a file.
    • The selected file path is stored in filenames, and the button label is updated to show the file name.

  5. Playback Control Buttons:

    • sequencebutton and simulbutton are GtkButtons for playing the selected files in sequence or simultaneously, respectively.
    • seqhandlerid and simulhandlerid are variables to store the signal handler IDs for these buttons.
    • stopbutton is a GtkButton for stopping playback.

  6. Position and Repeat Controls:

    • startcontrol and endcontrol are GtkScales to set the start and end positions for playback.
    • repeats is a GtkScale to set the number of repeats for playback.

  7. Volume Controls:

    • fboxes is an array of GtkBoxes for each file.
    • volumecontrols is an array of GtkScales to control the volume of each file.

  8. Playback Function play:

    • This function handles the actual audio playback.
    • It takes a simul argument that determines whether to play the files simultaneously (true) or in sequence (false).
    • It constructs a command line string based on the selected files, volume settings, start/end positions, and repeat count.
    • It starts the playback process using run and assigns it to playprocess.

  9. clearfornew Function:

    • This function clears the GUI and resets it for a new playback session.
    • It clears the filenames, filedurations, and volumecontrols, resets the repeat count, and hides the GUI elements.

  10. Signal Handler Connections:

  • Signal handlers are connected to the various GUI elements to handle clicks and other events.
  • When the playsequential button is clicked, it calls the play(false) function to play the files in sequence.
  • When the playsimul button is clicked, it calls the play(true) function to play the files simultaneously.
  • When the killplay function is called, it kills the playprocess.
  • The endit function notifies a condition variable when the GUI window is closed, allowing the main program to terminate.
  1. Main Program:
  • recordingplayerapp(numfiles=2) is called to create the GUI with two file selection buttons.
  • The program waits for the condition variable to be notified, which happens when the GUI window is closed.

Source code in the julia programming language

using Distributed, Gtk, LibSndFile, MP3
using FileIO: load

function recordingplayerapp(numfiles=2)
    # create window and widgets
    win = GtkWindow("Recorded Sound Player", 400, 400) |> (GtkFrame() |> (vbox = GtkBox(:v)))
    playprocess = @async(0)
    filenames = fill("", numfiles)
    filedurations = zeros(numfiles)
    filebutton = GtkButton[]
    for i in 1:numfiles
        push!(filebutton, GtkButton("Select File $i"))
        push!(vbox, filebutton[i])
    end

    sequencebutton = GtkButton("Play In Sequence")
    simulbutton = GtkButton("Play Simultaneously")
    seqhandlerid = zero(UInt32)
    simulhandlerid = zero(UInt32)
    stopbutton = GtkButton("Stop Play")

    labelstart = GtkLabel("Start Position")
    startcontrol = GtkScale(false, 1:100)
    set_gtk_property!(startcontrol, :hexpand, true)
    adj = GtkAdjustment(startcontrol)

    labelstop = GtkLabel("Stop Position")
    endcontrol = GtkScale(false, 1:100)
    set_gtk_property!(endcontrol, :hexpand, true)
    adj = GtkAdjustment(endcontrol)

    labelrepeat = GtkLabel("Repeats")
    repeats = GtkScale(false, 0:8)
    set_gtk_property!(repeats, :hexpand, true)
    set_gtk_property!(GtkAdjustment(repeats), :value, 0)

    foreach(x -> push!(vbox, x), [sequencebutton, simulbutton, stopbutton, labelstart,
                                  startcontrol, labelstop, endcontrol, labelrepeat, repeats])
    twobox = GtkBox(:h)
    push!(vbox, twobox)

    fboxes = GtkBox[]
    volumecontrols = GtkScale[]
    startcontrols = GtkScale[]
    endcontrols = GtkScale[]
    loopcontrols = GtkScale[]
    for i in 1:numfiles
        push!(fboxes, GtkBox(:v))
        push!(twobox, fboxes[i])

        push!(volumecontrols, GtkScale(false, 0.0:0.05:1.0))
        set_gtk_property!(volumecontrols[i], :hexpand, true)
        adj = GtkAdjustment(volumecontrols[i])
        set_gtk_property!(adj, :value, 0.5)
        push!(fboxes[i], GtkLabel("Volume Stream $i"), volumecontrols[i])

        signal_connect(filebutton[i], :clicked) do widget
            filenames[i] = open_dialog("Pick a sound or music file")
            filenames[i] = replace(filenames[i], "\\" => "/")
            set_gtk_property!(filebutton[i], :label, filenames[i])
            if count(x -> x != "", filenames) > 0
                signal_handler_unblock(sequencebutton, seqhandlerid)
            end
            if count(x -> x != "", filenames) > 1
                signal_handler_unblock(simulbutton, simulhandlerid)
            end
            if occursin(r"\.mp3$", filenames[i])
                buf = load(filenames[i])
                filedurations[i] = MP3.nframes(buf) / MP3.samplerate(buf)
            else
                buf = load(filenames[i])
                filedurations[i] = LibSndFile.nframes(buf) / LibSndFile.samplerate(buf)
            end
            adj = GtkAdjustment(startcontrol)
            set_gtk_property!(adj, :lower, 0.0)
            set_gtk_property!(adj, :upper, maximum(filedurations))
            set_gtk_property!(adj, :value, 0.0)
            adj = GtkAdjustment(endcontrol)
            set_gtk_property!(adj, :lower, 0.0)
            set_gtk_property!(adj, :upper, maximum(filedurations))
            set_gtk_property!(adj, :value, maximum(filedurations))
        end
    end

    # run play after getting parameters from widgets
    function play(simul::Bool)
        args = simul ? String["-m"] : String[]
        tstart = Gtk.GAccessor.value(startcontrol)
        tend = Gtk.GAccessor.value(endcontrol)
        for i in 1:numfiles
            if filenames[i] != ""
                volume = Gtk.GAccessor.value(volumecontrols[i])
                push!(args, "-v", string(volume), filenames[i])
            end
        end
        repeat = Gtk.GAccessor.value(repeats)
        if repeat != 0
            push!(args, "repeat", string(repeat))
        end
        if !(tstart ≈ 0.0 && tend ≈ maximum(filedurations))
            push!(args, "trim", string(tstart), string(tend))
        end
        playprocess = run(`play $args`; wait=false)
        clearfornew()
    end

    function clearfornew()
        signal_handler_block(sequencebutton, seqhandlerid)
        if count(x -> x != "", filenames) > 1
            signal_handler_block(simulbutton, simulhandlerid)
        end
        filenames = fill("", numfiles)
        filedurations = zeros(numfiles)
        foreach(i -> set_gtk_property!(filebutton[i], :label, "Select File $i"), 1:numfiles)
        set_gtk_property!(GtkAdjustment(repeats), :value, 0)
        showall(win)
    end
    
    killplay(w) = kill(playprocess)

    playsimul(w) = play(true)
    playsequential(w) = play(false)

    seqhandlerid = signal_connect(playsequential, sequencebutton, :clicked)
    signal_handler_block(sequencebutton, seqhandlerid)
    simulhandlerid = signal_connect(playsimul, simulbutton, :clicked)
    signal_handler_block(simulbutton, simulhandlerid)
    signal_connect(killplay, stopbutton, :clicked)

    cond = Condition()
    endit(w) = notify(cond)
    signal_connect(endit, win, :destroy)
    showall(win)
    wait(cond)
end

recordingplayerapp()

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